Abstract
An investigation of photoacoustic detection using 3.2–3.6 and 5 μm diode lasers is described. An inexpensive resonant photoacoustic system was developed based, on a simple glass cell and condenser and electret microphone (Brüel & Kjaer type 4144/Sennheiser type K6P). The system was tested on the single rotation–vibration lines of C 2H 2, CO, COS, and NH 3 gases. The best detection limits obtained are 300 ppm V for C 2H 2 and 20 ppm V for COS. Potential applications of infrared diode laser photoacoustic detection lie in the areas of analytical chemistry, atmospheric research, and investigation of the kinetics of reactive species.
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