Advances in differential photoacoustic spectroscopy for trace gas detection

Zhang, Le; Liu, Lixian; Liu, Yanyan; Zhang, Xueshi; Huan, Huiting; Yin, Xukun; Xi, Teli; Shao, Xiaopeng

doi:10.1002/mop.33228

Cited by 15 publications

(8 citation statements)

References 66 publications

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“…In order to realize dynamic measurement, a differential resonant PA cell was designed for the detection of NO 2 . ,, The gas inlet and outlet were located at the two buffers of the PA cell, separately. The two MEMS microphones were placed in the center of two resonant tubes.…”

Section: Principle and Simulationmentioning

confidence: 99%

High-Precision Photoacoustic Nitrogen Dioxide Gas Analyzer for Fast Dynamic Measurement

Qi,

Zhang,

et al. 2024

Anal. Chem.

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A high-precision photoacoustic (PA) gas analyzer for fast dynamic measurement of ambient nitrogen dioxide (NO2) was developed. The PA analyzer used a differential PA cell combined with two mufflers to achieve rapid gas flow gas detection. A high-power laser diode (LD) with a center wavelength of 450 nm was used as the PA signal excitation source. To reduce the saturated absorption effect of NO2, ambient air was pumped into the analyzer at a flow rate of 900 sccm. Two mufflers were combined with the differential PA cell to reduce the noise caused by the airflow and pump. The parameters of the mufflers were optimized by using a finite element method. The experimental results showed that the gas flow noise was suppressed by 95%. The response time of the PAS analyzer was 34 s. The detection limits of the analyzer were 0.64 and 0.17 ppb when the integration times were 1 and 15 s, respectively. A 120 h continuous monitoring result was compared with the data from the National Environmental Monitoring Station to demonstrate the high reliability of the analyzer.

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Section: Principle and Simulationmentioning

confidence: 99%

High-Precision Photoacoustic Nitrogen Dioxide Gas Analyzer for Fast Dynamic Measurement

Qi,

Zhang,

et al. 2024

Anal. Chem.

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“…The advantage of the small size of the non-resonant photoacoustic cell makes it applicable in some specific fields such as transformer fault diagnosis and insulation gas leakage detection. [29][30][31][32][33] In 1943, Luft designed a dual-pipe non-resonant photoacoustic cell for differential detection, 34 which improved the PAS gas detection system developed by Viegerov in 1938 and reduced the lower limit of CO 2 detection (0.2%) to the order of 10 −6 , which was the first improvement of the photoacoustic cell. Later, with the theoretical refinement of the photoacoustic cell, various factors affecting the photoacoustic signal were found and used to improve the photoacoustic cell.…”

Section: Non-resonant Photoacoustic Cellmentioning

confidence: 99%

Photoacoustic Spectroscopy Gas Detection Technology Research Progress

Xiong,

Yin,

Wang

et al. 2023

Appl Spectrosc

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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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“…By subtracting both microphone signals, one gets the "differential pressure signal." DPAS cells have been shown to significantly reduce noise caused by heating glass windows and external noise since those pressure variations do have the same sign on both microphones (e.g., [1,9,10]).…”

Section: Introductionmentioning

confidence: 99%

Signal Enhancement of a Differential Photoacoustic Cell by Connecting the Microphones via Capillaries

Boyko,

Lange,

Eckert

et al. 2024

Sensors

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Differential photoacoustic spectroscopy (DPAS) cells are usually excited on the first longitudinal ring mode, with a microphone situated in the middle of each of the two resonator tubes. However, it is known from other photoacoustic spectroscopy cell designs that connecting the microphones via a capillary can lead to signal enhancement. By means of finite element method (FEM) simulations, we compared such a photoacoustic spectroscopy (PAS) cell with a capillary to a DPAS cell with a capillary attached to each of the two resonators and showed that the behavior of both systems is qualitatively the same: In both the PAS and the DPAS cell, in-phase and anti-phase oscillations of the coupled system (resonator–capillary) can be excited. In the DPAS cell, capillaries of suitable length also increase the pressure signal at the microphones according to the FEM simulations. For different capillary diameters (1.2 mm/1.7 mm/2.2 mm), the respective optimal capillary length (36–37.5 mm) and signal amplification was determined (94%, 70%, 53%). According to the results of these FEM simulations, a significant increase in sensitivity can, therefore, also be achieved in DPAS cells by expanding them with thin tubes leading to the microphones.

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Advances in differential photoacoustic spectroscopy for trace gas detection

Cited by 15 publications

References 66 publications

High-Precision Photoacoustic Nitrogen Dioxide Gas Analyzer for Fast Dynamic Measurement

High-Precision Photoacoustic Nitrogen Dioxide Gas Analyzer for Fast Dynamic Measurement

Photoacoustic Spectroscopy Gas Detection Technology Research Progress

Signal Enhancement of a Differential Photoacoustic Cell by Connecting the Microphones via Capillaries

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