trace gas detection
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2022 ◽  
Vol 148 ◽  
pp. 107695
Author(s):  
Lixian Liu ◽  
Huiting Huan ◽  
Andreas Mandelis ◽  
Le Zhang ◽  
Chengfei Guo ◽  
...  

Chemosensors ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 268
Author(s):  
Le Zhang ◽  
Lixian Liu ◽  
Huiting Huan ◽  
Xukun Yin ◽  
Xueshi Zhang ◽  
...  

A non-local patch regression (NLPR) denoising-enhanced differential broadband photoacoustic (PA) sensor was developed for the high-sensitive detection of multiple trace gases. Using the edge preservation index (EPI) and signal-to-noise ratio (SNR) as a dual-criterion, the fluctuation was dramatically suppressed while the spectral absorption peaks were maintained by the introduction of a NLPR algorithm. The feasibility of the broadband framework was verified by measuring the C2H2 in the background of ambient air. A normalized noise equivalent absorption (NNEA) coefficient of 6.13 × 10−11 cm−1·W·Hz−1/2 was obtained with a 30-mW globar source and a SNR improvement factor of 23. Furthermore, the simultaneous multiple-trace-gas detection capability was determined by measuring C2H2, H2O, and CO2. Following the guidance of single-component processing, the NLPR processed results showed higher EPI and SNR compared to the spectra denoised by the wavelet method and the non-local means algorithm. The experimentally determined SNRs of the C2H2, H2O, and CO2 spectra were improved by a factor of 20. The NNEA coefficient reached a value of 7.02 × 10−11 cm−1·W·Hz−1/2 for C2H2. The NLPR algorithm presented good performance in noise suppression and absorption peak fidelity, which offered a higher dynamic range and was demonstrated to be an effective approach for trace gas analysis.


2021 ◽  
pp. 2000583
Author(s):  
Fabrizio R. Giorgetta ◽  
Jeff Peischl ◽  
Daniel I. Herman ◽  
Gabriel Ycas ◽  
Ian Coddington ◽  
...  

2021 ◽  
Author(s):  
Charles Markus ◽  
Mitchio Okumura ◽  
Mahmood Bagheri ◽  
Lukasz Sterczewski ◽  
Douglas Ober ◽  
...  

2021 ◽  
Author(s):  
Muhammad Abbas ◽  
KHALIL ESLAMI JAHROMI ◽  
Mohammadreza Nematollahi ◽  
Roderik Krebbers ◽  
Ningwu Liu ◽  
...  

2021 ◽  
Vol 29 (8) ◽  
pp. 12381
Author(s):  
Khalil Eslami Jahromi ◽  
Mohammadreza Nematollahi ◽  
Roderik Krebbers ◽  
Muhammad Ali Abbas ◽  
Amir Khodabakhsh ◽  
...  

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