Performance improvement of light-induced thermoelastic spectroscopy gas detection system

Xiaomeng Du; Qinduan Zhang; Yubin Wei; Haifeng Liu; Yuheng Li; Qizhen Yang; Tingting Zhang; Xinnan Wu; Yanran Li; Yanfang Li

doi:10.1117/12.2690919

6 November 2023 Performance improvement of light-induced thermoelastic spectroscopy gas detection system

Xiaomeng Du, Qinduan Zhang, Yubin Wei, Haifeng Liu, Yuheng Li, Qizhen Yang, Tingting Zhang, Xinnan Wu, Yanran Li, Yanfang Li

Author Affiliations +

Proceedings Volume 12921, Third International Computing Imaging Conference (CITA 2023); 129212M (2023) https://doi.org/10.1117/12.2690919
Event: Third International Computing Imaging Conference (CITA 2023), 2023, Sydney, Australia

Abstract

In recent years, gas sensors are widely used in military and civilian fields. Light-Induced Thermoelastic Spectroscopy (LITES) plays an important role in trace gas sensing. This paper focuses on our recent work to improve the performance of the LITES gas detection system. Firstly, a LITES gas detection system based on a novel QTF-self-difference technique was proposed. The Distributed Feedback Laser Diode (DFB-LD) was internally driven by a low-frequency scanning signal and externally modulated by a high-frequency modulated signal using an Acousto-Optic Modulator (AOM). The output laser was divided into two laser beams by a fiber coupler and irradiated from both sides of the QTF, and the signal was measured using the light-induced thermoelastic properties of the QTF. The results showed that the system can reduce the noise of the LITES system and has a good linear response. Secondly, a long-path LITES gas sensor using a high-power Q-switched fiber laser was reported. The LITES gas detection system signal was enhanced by increasing the laser power and absorption optical path. The sensor achieved a Minimum Detection Limit (MDL) of 6.1 ppb at the integration time of 48 s. Finally, a comprehensive dual-spectroscopy detection technique based on LITES and Quartz-Enhanced Photoacoustic Spectroscopy (QEPAS) using a quartz tuning fork was demonstrated. The system utilized a dual-spectrum detection structure to enhance the detection sensitivity. The system was tested for C₂H₂, and the results showed that the system has superior detection performance compared to conventional detection systems.

Citation Download Citation

Xiaomeng Du, Qinduan Zhang, Yubin Wei, Haifeng Liu, Yuheng Li, Qizhen Yang, Tingting Zhang, Xinnan Wu, Yanran Li, and Yanfang Li "Performance improvement of light-induced thermoelastic spectroscopy gas detection system", Proc. SPIE 12921, Third International Computing Imaging Conference (CITA 2023), 129212M (6 November 2023); https://doi.org/10.1117/12.2690919

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
6 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Beam path

Signal detection

Light absorption

Signal generators

Modulation

Optical gas detection

Sensors

Show All Keywords

Keywords/Phrases

Search In:

Publication Years