Author： Elia Angela Di Franco Cinzia Spagnolo Vincenzo Lugarà Pietro Mario Scamarcio Gaetano
Publisher： MDPI
E-ISSN： 1424-8220|9|4|2697-2705
ISSN： 1424-8220
Source： Sensors, Vol.9, Iss.4, 2009-04, pp. : 2697-2705
Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.
Abstract
We report on the development of a photoacoustic sensor for the detection of formaldehyde (CH2O) using a thermoelectrically cooled distributed-feedback quantum cascade laser operating in pulsed mode at 5.6 μm. A resonant photoacoustic cell, equipped with four electret microphones, is excited in its first longitudinal mode at 1,380 Hz. The absorption line at 1,778.9 cm−1 is selected for CH2O detection. A detection limit of 150 parts per billion in volume in nitrogen is achieved using a 10 seconds time constant and 4 mW laser power. Measurements in ambient air will require water vapour filters.
Related content
Access to resources
Recommend
Planar Laser-Based QEPAS Trace Gas Sensor
By Ma Yufei He Ying Chen Cheng Yu Xin Zhang Jingbo Peng Jiangbo Sun Rui Tittel Frank K.
Sensors, Vol. 16, Iss. 7, 2016-06 ,pp. :