Issue 8, 2005

Laser diode photoacoustic detection in the infrared and near infrared spectral ranges

Abstract

A new technique for high resolution photoacoustic detection based on application of laser diodes has been developed. This method was tested and compared using identical photoacoustic instrumentation (cell and microphone) to study gas absorption in three different spectral regions, namely: the infrared range near 2100 cm−1, CO and OCS fundamental band absorption; the ranges near 4200 and 4350 cm−1, CH4, NH3 and N2O overtone and combination band absorption; the near infrared range near 6500 cm−1, CO, CO2 and NH3 overtone absorption. Several types of diode laser operating at room temperature or at liquid nitrogen temperature were compared. The optimum gas pressures for the maximum sensitivity of the photoacoustic signals were found and the detection limits were estimated for all of the gases studied. The best sensitivity was achieved for NH3 at 100 ppbv. The sensitivity of the developed system was tested on detection of traces of NH3 and CO2 gases from car exhaust.

Graphical abstract: Laser diode photoacoustic detection in the infrared and near infrared spectral ranges

Article information

Article type
Paper
Submitted
15 Mar 2005
Accepted
17 May 2005
First published
10 Jun 2005

Analyst, 2005,130, 1148-1154

Laser diode photoacoustic detection in the infrared and near infrared spectral ranges

V. Horká, S. Civiš, L. Xu and R. M. Lees, Analyst, 2005, 130, 1148 DOI: 10.1039/B503838C

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