Design and Characterization of Macroscopic Indirect Photoacoustic Gas Sensor

A macroscopic photoacoustic gas sensing (PAS) system, along with the design considerations, are presented in this paper. The system is based on the indirect PAS principle. The system consists of a black body IR emitter, suitable optical windows for radiation transmission and a highly sensitive detec...

Full description

Saved in:

Bibliographic Details
Published in:	2022 IEEE Sensors pp. 1 - 4
Main Authors:	Srivastava, Ananya, Tian, Yuanji, Bittner, Achim, Dehe, Alfons
Format:	Conference Proceeding
Language:	English
Published:	IEEE 30-10-2022
Subjects:	CO 2 concentration measurements gas sensor Geometrical optics Length measurement Loss measurement Macroscopic PAS Optical variables measurement PAS prototypes Photoacoustic Prototypes Stimulated emission Volume measurement
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	A macroscopic photoacoustic gas sensing (PAS) system, along with the design considerations, are presented in this paper. The system is based on the indirect PAS principle. The system consists of a black body IR emitter, suitable optical windows for radiation transmission and a highly sensitive detector in the form of a microphone. A first prototype and its optimized version, for the CO 2 PAS measurements, are subsequently developed and characterized. The prototypes are used for CO 2 concentration measurements in the range of 0-5000 ppm. The length of the whole system is 8-15 cm, with the length of the variable measurement volume 5-12 cm. With the 5 cm long measurement volume, 10 ppm resolution is achieved for the second prototype. With the lock-in integration time of 307 seconds, the theoretical limit of detection (LOD) of 37 ppb is achieved.
ISSN:	2168-9229
DOI:	10.1109/SENSORS52175.2022.9967215