Application of InAsSb/InAsSbP and lead chalcogenide infrared diode lasers for photoacoustic detection in the 3.2 and 5 microm region.
An investigation of photoacoustic detection using 3.2-3.6 and 5 mum 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(2)H(2), CO, COS, and NH(3) gases. The best detection limits obtained are 300 ppm V for C(2)H(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.
Kania
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J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejskova 3, 18223 Prague 8, Czech Republic.
Civis
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D000162:Acoustics; D018011:Chalcogens / Q000737:chemistry*; D004867:Equipment Design; D005740:Gases; D007834:Lasers; D007854:Lead / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013053:Spectrophotometry / Q000295:instrumentation / Q000379:methods; D014732:Vibration
D018011:Chalcogens; D005740:Gases; D007854:Lead