1
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Peng J, Cao Y, Wang R, Wang G, Mei J, Liu K, Chen W, Gao X. Simultaneous Detection of Major Greenhouse Gases with Multiresonator Photoacoustic Spectroscopy. Anal Chem 2024. [PMID: 39219057 DOI: 10.1021/acs.analchem.4c02754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/04/2024]
Abstract
Greenhouse gas (GHG) detection plays an important role in climate change research and industry applications. A novel photoacoustic spectroscopy (PAS) sensor based on multiple resonators has been developed for the detection of GHGs. The major GHGs CO2, CH4, and N2O were measured simultaneously using only one acoustic sensor by coupling three acoustic resonators into a photoacoustic cell. A sinusoidal voltage signal-driven noise source was integrated into a multiresonator photoacoustic cell, allowing convenient calibration of the resonant frequency of the photoacoustic cell. The performance of the sensor was further enhanced by reflecting a laser beam four times in the photoacoustic cell. Allan deviation analysis showed that the minimum detection limits of 2.7 ppm, 90 ppb, and 1 ppb could be achieved for CO2, CH4, and N2O, respectively, over a 300 s integration time. The feasibility of the system was confirmed by continuous measurements of the three major GHGs from different sources for up to 10 h.
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Affiliation(s)
- Jie Peng
- Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei230031, China
| | - Yuan Cao
- Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei230031, China
| | - Ruifeng Wang
- Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei230031, China
| | - Guishi Wang
- Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei230031, China
| | - Jiaoxu Mei
- Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei230031, China
| | - Kun Liu
- Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei230031, China
| | - Weidong Chen
- Laboratoire de Physicochimie de l'Atmosphère, Université du Littoral Côte d'Opale, 189A, Av. Maurice Schumann, Dunkerque59140, France
| | - Xiaoming Gao
- Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei230031, China
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2
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Zhang C, He Y, Qiao S, Liu Y, Ma Y. High-sensitivity trace gas detection based on differential Helmholtz photoacoustic cell with dense spot pattern. PHOTOACOUSTICS 2024; 38:100634. [PMID: 39100198 PMCID: PMC11296056 DOI: 10.1016/j.pacs.2024.100634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/14/2024] [Revised: 07/02/2024] [Accepted: 07/07/2024] [Indexed: 08/06/2024]
Abstract
A high-sensitivity photoacoustic spectroscopy (PAS) sensor based on differential Helmholtz photoacoustic cell (DHPAC) with dense spot pattern is reported in this paper for the first time. A multi-pass cell based on two concave mirrors was designed to achieve a dense spot pattern, which realized 212 times excitation of incident laser. A finite element analysis was utilized to simulate the sound field distribution and frequency response of the designed DHPAC. An erbium-doped fiber amplifier (EDFA) was employed to amplify the output optical power of the laser to achieve strong excitation. In order to assess the designed sensor's performance, an acetylene (C2H2) detection system was established using a near infrared diode laser with a central wavelength 1530.3 nm. According to experimental results, the differential characteristics of DHPAC was verified. Compared to the sensor without dense spot pattern, the photoacoustic signal with dense spot pattern had a 44.73 times improvement. The minimum detection limit (MDL) of the designed C2H2-PAS sensor can be improved to 5 ppb when the average time of the sensor system is 200 s.
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Affiliation(s)
- Chu Zhang
- National Key Laboratory of Laser Spatial Information, Harbin Institute of Technology, Harbin 150001, China
| | - Ying He
- National Key Laboratory of Laser Spatial Information, Harbin Institute of Technology, Harbin 150001, China
| | - Shunda Qiao
- National Key Laboratory of Laser Spatial Information, Harbin Institute of Technology, Harbin 150001, China
| | - Yahui Liu
- National Key Laboratory of Laser Spatial Information, Harbin Institute of Technology, Harbin 150001, China
| | - Yufei Ma
- National Key Laboratory of Laser Spatial Information, Harbin Institute of Technology, Harbin 150001, China
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3
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Guo G, Li L, Zhou Y, Gong T, Tian Y, Sun X, Cui J, Shi S, Guo Z, He X, Qiu X, Sun J, Jiang C, Fittschen C, Li C. High-Sensitivity Differential Helmholtz Photoacoustic System Combined with the Herriott Multipass Cell and Its Application in Seed Respiration. Anal Chem 2024; 96:7730-7737. [PMID: 38703107 DOI: 10.1021/acs.analchem.4c00963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/06/2024]
Abstract
A highly sensitive photoacoustic detection system using a differential Helmholtz resonator (DHR) combined with a Herriott multipass cell is presented, and its implementation to sub-ppm level carbon dioxide (CO2) detection is demonstrated. Through the utilization of erbium-doped optical fiber amplifier (EDFA), the laser power was amplified to 150 mW. Within the multipass cell, a total of 22 reflections occurred, contributing to an impressive 33.6 times improvement in the system sensitivity. The normalized noise equivalent absorption coefficient (NNEA) was 8.64 × 10-11 cm-1·W·Hz-1/2 [signal-to-noise ratio, (SNR) = 1] and according to the Allan variance analysis, a minimum detection limit of 500 ppb could be achieved for CO2 at 1204 s, which demonstrates the long-term stability of the system. The system was applied to detect the respiration of rice and upland rice seeds. It is demonstrated that the system can monitor and distinguish the respiration intensity and respiration rate of different seeds in real time.
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Affiliation(s)
- Guqing Guo
- Shanxi Province Engineering Research Center of Precision Measurement and Online Detection Equipment, Shanxi Center of Technology Innovation for Light Manipulations and Applications, School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China
| | - Lin Li
- Shanxi Province Engineering Research Center of Precision Measurement and Online Detection Equipment, Shanxi Center of Technology Innovation for Light Manipulations and Applications, School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China
| | - Yueting Zhou
- Shanxi Province Engineering Research Center of Precision Measurement and Online Detection Equipment, Shanxi Center of Technology Innovation for Light Manipulations and Applications, School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China
| | - Ting Gong
- Shanxi Province Engineering Research Center of Precision Measurement and Online Detection Equipment, Shanxi Center of Technology Innovation for Light Manipulations and Applications, School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China
| | - Yali Tian
- Shanxi Province Engineering Research Center of Precision Measurement and Online Detection Equipment, Shanxi Center of Technology Innovation for Light Manipulations and Applications, School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China
| | - Xiaocong Sun
- Shanxi Province Engineering Research Center of Precision Measurement and Online Detection Equipment, Shanxi Center of Technology Innovation for Light Manipulations and Applications, School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China
| | - Jiahua Cui
- Shanxi Province Engineering Research Center of Precision Measurement and Online Detection Equipment, Shanxi Center of Technology Innovation for Light Manipulations and Applications, School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China
| | - Shuai Shi
- Shanxi Province Engineering Research Center of Precision Measurement and Online Detection Equipment, Shanxi Center of Technology Innovation for Light Manipulations and Applications, School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China
| | - Zhenyu Guo
- Shanxi Province Engineering Research Center of Precision Measurement and Online Detection Equipment, Shanxi Center of Technology Innovation for Light Manipulations and Applications, School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China
| | - Xiaohu He
- Shanxi Province Engineering Research Center of Precision Measurement and Online Detection Equipment, Shanxi Center of Technology Innovation for Light Manipulations and Applications, School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China
| | - Xuanbing Qiu
- Shanxi Province Engineering Research Center of Precision Measurement and Online Detection Equipment, Shanxi Center of Technology Innovation for Light Manipulations and Applications, School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China
| | - Jing Sun
- Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, China
| | - Chenyu Jiang
- Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, China
| | - Christa Fittschen
- CNRS, UMR 8522-PC2A─Physicochimie des Processus de Combustion et de l'Atmosphère, Université Lille, Lille F-59000, France
| | - Chuanliang Li
- Shanxi Province Engineering Research Center of Precision Measurement and Online Detection Equipment, Shanxi Center of Technology Innovation for Light Manipulations and Applications, School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China
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Xiong S, Yin X, Wang Q, Xia J, Chen Z, Lei H, Yan X, Zhu A, Qiu F, Chen B, Wang Q, Zhang L, Zhang K. Photoacoustic Spectroscopy Gas Detection Technology Research Progress. APPLIED SPECTROSCOPY 2024; 78:139-158. [PMID: 37936290 DOI: 10.1177/00037028231208712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2023]
Abstract
Photoacoustic spectroscopy (PAS) can be utilized as an ultrasensitive gas detection method. The basic principles of gas detection using PAS are discussed in this paper. First, the basic instrumentation for a PAS gas detection system is introduced focusing on the photoacoustic cell. The discussion includes non-resonant photoacoustic cells and the different types of resonant photoacoustic cells, including the longitudinal photoacoustic cell, the Helmholtz photoacoustic cell, the T-type photoacoustic cell, and the high-frequency resonant photoacoustic cell. The basic working principles of each of these, cells as well as the advantages and disadvantages of photoacoustic cells are discussed, and the development of newer types of photoacoustic cells in recent years is outlined in detail. This review provides detailed reference information and guidance for interested researchers who would like to design and build advanced photoacoustic cells for gas detection.
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Affiliation(s)
- Shuidong Xiong
- College of Meteorology and Oceanography, National University of Defense Technology, Changsha, China
| | - Xiangyu Yin
- College of Information Science and Engineering, Northeastern University, Shenyang, China
| | - Qi Wang
- College of Information Science and Engineering, Northeastern University, Shenyang, China
- State Key Laboratory of Synthetical Automation for Process Industries, Northeastern University, Shenyang, China
- Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology, Qinhuangdao, China
| | - Ji Xia
- College of Meteorology and Oceanography, National University of Defense Technology, Changsha, China
| | - Ziqiang Chen
- College of Information Science and Engineering, Northeastern University, Shenyang, China
| | - Hongwei Lei
- College of Information Science and Engineering, Northeastern University, Shenyang, China
| | - Xin Yan
- College of Information Science and Engineering, Northeastern University, Shenyang, China
| | - Aisong Zhu
- Zhejiang Chinese Medicine University, Hangzhou, China
| | - Fengmei Qiu
- Zhejiang Chinese Medicine University, Hangzhou, China
| | - Binhai Chen
- Zhejiang Chinese Medicine University, Hangzhou, China
| | - Qiaoyun Wang
- Northeastern University at Qinhuangdao, Qinhuangdao, China
| | - Lei Zhang
- Emergency Management Department of Shenyang Fire Research Institute, Shenyang, China
| | - Keke Zhang
- Institute of Ocean Instruments Qilu, University of Technology (Shandong Academy of Sciences), Qingdao, China
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5
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Zhang C, He Y, Qiao S, Ma Y. Differential integrating sphere-based photoacoustic spectroscopy gas sensing. OPTICS LETTERS 2023; 48:5089-5092. [PMID: 37773392 DOI: 10.1364/ol.500214] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Accepted: 09/08/2023] [Indexed: 10/01/2023]
Abstract
In this Letter, a differential integrating sphere-based photoacoustic spectroscopy (PAS) gas sensor is proposed for the first time to our knowledge. The differential integrating sphere system consists of two integrating spheres and a tube. Based on differential characteristics, the photoacoustic signal of the designed differential integrating sphere was doubly enhanced and the noise was suppressed. Compared with a single channel integrating sphere, the differential integrating sphere sensing system had a 1.86 times improvement in signal level. An erbium-doped fiber amplifier (EDFA) was adopted to amplify the output of diode laser to enhance the optical excitation. The second harmonic (2f) signal of differential integrating sphere-based acetylene (C2H2) PAS sensor with an amplified 1000 mW optical output power was 104.67 mV, which was 22.80 times improved compared to the sensing system without EDFA. When the integration time was 100 s, the minimum detection limit (MDL) of the differential integrating sphere-based C2H2 PAS sensor was 416.7 ppb. The differential integrating sphere provides a new method, to the best of our knowledge, for the development of PAS sensor, which has the advantages of photoacoustic signal enhancement, strong noise immunity, and no need for optical adjustment.
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Ma Q, Li L, Gao Z, Tian S, Yu J, Du X, Qiao Y, Shan C. Near-infrared sensitive differential Helmholtz-based hydrogen sulfide photoacoustic sensors. OPTICS EXPRESS 2023; 31:14851-14861. [PMID: 37157340 DOI: 10.1364/oe.488835] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
A near-infrared (NIR) sub-ppm level photoacoustic sensor for hydrogen sulfide (H2S) using a differential Helmholtz resonator (DHR) as the photoacoustic cell (PAC) was presented. The core detection system was composed of a NIR diode laser with a center wavelength of 1578.13 nm, an Erbium-doped optical fiber amplifier (EDFA) with an output power of ∼120 mW, and a DHR. Finite element simulation software was used to analyze the influence of the DHR parameters on the resonant frequency and acoustic pressure distribution of the system. Through simulation and comparison, the volume of the DHR was 1/16 that of the conventional H-type PAC for a similar resonant frequency. The performance of the photoacoustic sensor was evaluated after optimizing the DHR structure and modulation frequency. The experimental results showed that the sensor had an excellent linear response to the gas concentration and the minimum detection limit (MDL) for H2S detection in differential mode can reach 460.8 ppb.
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Li Z, Liu J, Si G, Ning Z, Fang Y. Active noise reduction for a differential Helmholtz photoacoustic sensor excited by an intensity-modulated light source. OPTICS EXPRESS 2023; 31:1154-1166. [PMID: 36785156 DOI: 10.1364/oe.478966] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 12/08/2022] [Indexed: 06/18/2023]
Abstract
A highly sensitive differential Helmholtz photoacoustic sensor with active noise reduction was reported. Coupled to one cavity of the photoacoustic cell, an intensity-modulated excitation light would reflect multiple times to produce photoacoustic signal, and meanwhile cause the solid-state photoacoustic effect forming differential mode noise with the frequency same as the photoacoustic signal, which could not be suppressed by conventional differential technology. Wavelength modulation technology is a splendid method to restrain this effect, which is not suitable for light sources with not adjustable wavelength. To suppress this kind of noise, an intensity-modulated compensation light was coupled to another cavity, whose central wavelength was at the non-absorption line of the measured gas. The compensation light was of the same frequency, phase, and power as the excitation light, by which the solid-state photoacoustic effects were produced to form destructive interference called active noise reduction. The experiment results showed that the active noise reduction significantly improved the signal-to-noise ratio and signal-to-background ratio. Compared with the differential, the differential with active noise reduction improved signal-to- noise ratio by about 1.2 times and signal-to-background ratio by about 9.4 times. When low-power near-infrared lasers were employed as the two light sources, the minimum detection limits for acetylene and methane reached 21 and 200 ppb, respectively.
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Li Z, Liu J, Si G, Ning Z, Fang Y. Design of a high-sensitivity differential Helmholtz photoacoustic cell and its application in methane detection. OPTICS EXPRESS 2022; 30:28984-28996. [PMID: 36299083 DOI: 10.1364/oe.465161] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Accepted: 07/07/2022] [Indexed: 06/16/2023]
Abstract
A high-sensitivity differential Helmholtz photoacoustic cell based on multiple reflection was reported, and its performance parameters and gas replacement time were optimized by finite element simulation. To realize the long absorption path of the measured gas, the collimated excitation light was reflected multiple times on the gold-plated wall of the absorption cavity, and the wavelength modulation technology was used to reduce the multiple reflection noise. Additionally, the differential could suppress external co-phase noise and double the photoacoustic signal. When a laser with a central wavelength of 1653 nm was employed as the excitation light source, the minimum detection limit of 177 ppb (signal-to-noise ratio, SNR = 1) for methane was achieved within a detection time of 1 s, and the corresponding normalized noise equivalent absorption coefficient was 4.1×10-10 cm-1WHZ-1/2.
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Effect of Wearing Surgical Face Masks on Gas Detection from Respiration Using Photoacoustic Spectroscopy. Molecules 2022; 27:molecules27113618. [PMID: 35684554 PMCID: PMC9182023 DOI: 10.3390/molecules27113618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Revised: 06/01/2022] [Accepted: 06/02/2022] [Indexed: 11/17/2022] Open
Abstract
Wearing surgical face masks is among the measures taken to mitigate coronavirus disease (COVID-19) transmission and deaths. Lately, concern was expressed about the possibility that gases from respiration could build up in the mask over time, causing medical issues related to the respiratory system. In this research study, the carbon dioxide concentration and ethylene in the breathing zone were measured before and immediately after wearing surgical face masks using the photoacoustic spectroscopy method. From the determinations of this study, the C2H4 was established to be increased by 1.5% after one hour of wearing the surgical face mask, while CO2 was established to be at a higher concentration of 1.2% after one hour of wearing the surgical face mask, when the values were correlated with the baseline (control).
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Qiao Y, Tang L, Gao Y, Han F, Liu C, Li L, Shan C. Sensitivity enhanced NIR photoacoustic CO detection with SF 6 promoting vibrational to translational relaxation process. PHOTOACOUSTICS 2022; 25:100334. [PMID: 35198377 PMCID: PMC8844726 DOI: 10.1016/j.pacs.2022.100334] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 01/22/2022] [Accepted: 02/02/2022] [Indexed: 05/08/2023]
Abstract
A challenge for slowly relaxing carbon monoxide (CO) molecules detection using photoacoustic spectroscopy (PAS) is to promote the vibration-translation (V-T) relaxation process. Addressing this challenge, a sensitivity enhanced photoacoustic CO sensor with sulfur hexafluoride (SF6) as the promotor is investigated and demonstrated. A 1568 nm near-infrared (NIR) laser diode and a customized optical amplifier are used as the excitation source to generate the photoacoustic signal. A differential photoacoustic cell is simulated and designed to obtain identical laminar flow distribution in the resonant cell to suppress the flow noise. The modulation frequency and added SF6 volume ratio are optimized experimentally to achieve optimal sensitivity. Feasibility and performance of the CO sensor with a small amount of SF6 as promotor is discussed and evaluated, obtaining a ~ 2 times improvement of signal value compared to the one with pure N2 background and resulting in a minimum detection limit of 467.5 ppb for CO detection.
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Metcalfe GD, Smith TW, Hippler M. On-line analysis and in situ pH monitoring of mixed acid fermentation by Escherichia coli using combined FTIR and Raman techniques. Anal Bioanal Chem 2020; 412:7307-7319. [PMID: 32794006 PMCID: PMC7497492 DOI: 10.1007/s00216-020-02865-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 07/23/2020] [Accepted: 08/05/2020] [Indexed: 11/01/2022]
Abstract
We introduce an experimental setup allowing continuous monitoring of bacterial fermentation processes by simultaneous optical density (OD) measurements, long-path FTIR headspace monitoring of CO2, acetaldehyde and ethanol, and liquid Raman spectroscopy of acetate, formate, and phosphate anions, without sampling. We discuss which spectral features are best suited for detection, and how to obtain partial pressures and concentrations by integrations and least squares fitting of spectral features. Noise equivalent detection limits are about 2.6 mM for acetate and 3.6 mM for formate at 5 min integration time, improving to 0.75 mM for acetate and 1.0 mM for formate at 1 h integration. The analytical range extends to at least 1 M with a standard deviation of percentage error of about 8%. The measurement of the anions of the phosphate buffer allows the spectroscopic, in situ determination of the pH of the bacterial suspension via a modified Henderson-Hasselbalch equation in the 6-8 pH range with an accuracy better than 0.1. The 4 m White cell FTIR measurements provide noise equivalent detection limits of 0.21 μbar for acetaldehyde and 0.26 μbar for ethanol in the gas phase, corresponding to 3.2 μM acetaldehyde and 22 μM ethanol in solution, using Henry's law. The analytical dynamic range exceeds 1 mbar ethanol corresponding to 85 mM in solution. As an application example, the mixed acid fermentation of Escherichia coli is studied. The production of CO2, ethanol, acetaldehyde, acids such as formate and acetate, and the changes in pH are discussed in the context of the mixed acid fermentation pathways. Formate decomposition into CO2 and H2 is found to be governed by a zeroth-order kinetic rate law, showing that adding exogenous formate to a bioreactor with E. coli is expected to have no beneficial effect on the rate of formate decomposition and biohydrogen production.
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Affiliation(s)
- George D Metcalfe
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, UK
| | - Thomas W Smith
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, UK
- Water and Environmental Engineering Group, Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, SO17 1BJ, UK
| | - Michael Hippler
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, UK.
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Palzer S. Photoacoustic-Based Gas Sensing: A Review. SENSORS (BASEL, SWITZERLAND) 2020; 20:E2745. [PMID: 32403451 PMCID: PMC7248969 DOI: 10.3390/s20092745] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 05/06/2020] [Accepted: 05/09/2020] [Indexed: 01/16/2023]
Abstract
The use of the photoacoustic effect to gauge the concentration of gases is an attractive alternative in the realm of optical detection methods. Even though the effect has been applied for gas sensing for almost a century, its potential for ultra-sensitive and miniaturized devices is still not fully explored. This review article revisits two fundamentally different setups commonly used to build photoacoustic-based gas sensors and presents some distinguished results in terms of sensitivity, ultra-low detection limits, and miniaturization. The review contrasts the two setups in terms of the respective possibilities to tune the selectivity, sensitivity, and potential for miniaturization.
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Affiliation(s)
- Stefan Palzer
- Department of Computer Science, Universidad Autónoma de Madrid, Francisco Tomás y Valiente 11, 28049 Madrid, Spain
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Metcalfe GD, Alahmari S, Smith TW, Hippler M. Cavity-Enhanced Raman and Helmholtz Resonator Photoacoustic Spectroscopy to Monitor the Mixed Sugar Metabolism of E. coli. Anal Chem 2019; 91:13096-13104. [PMID: 31525022 PMCID: PMC7006961 DOI: 10.1021/acs.analchem.9b03284] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
![]()
We
introduce and compare two powerful new techniques for headspace
gas analysis above bacterial batch cultures by spectroscopy, Raman
spectroscopy enhanced in an optical cavity (CERS), and photoacoustic
detection in a differential Helmholtz resonator (DHR). Both techniques
are able to monitor O2 and CO2 and its isotopomers
with excellent sensitivity and time resolution to characterize bacterial
growth and metabolism. We discuss and show some of the shortcomings
of more conventional optical density (OD) measurements if used on
their own without more sophisticated complementary measurements. The
spectroscopic measurements can clearly and unambiguously distinguish
the main phases of bacterial growth in the two media studied, LB and
M9. We demonstrate how 13C isotopic labeling of sugars
combined with spectroscopic detection allows the study of bacterial
mixed sugar metabolism to establish whether sugars are sequentially
or simultaneously metabolized. For E. coli, we have
characterized the shift from glucose to lactose metabolism without
a classic diauxic lag phase. DHR and CERS are shown to be cost-effective
and highly selective analytical tools in the biosciences and in biotechnology,
complementing and superseding existing conventional techniques. They
also provide new capabilities for mechanistic investigations and show
a great deal of promise for use in stable isotope bioassays.
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Affiliation(s)
- George D Metcalfe
- Department of Chemistry , University of Sheffield , Sheffield S3 7HF , U.K
| | - Saeed Alahmari
- Department of Chemistry , University of Sheffield , Sheffield S3 7HF , U.K
| | - Thomas W Smith
- Department of Chemistry , University of Sheffield , Sheffield S3 7HF , U.K.,Water and Environmental Engineering Group, Faculty of Engineering and Physical Sciences , University of Southampton , Southampton SO17 1BJ , U.K
| | - Michael Hippler
- Department of Chemistry , University of Sheffield , Sheffield S3 7HF , U.K
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