Photo-acoustic spectrometer apparatus

Details Photo-acoustic spectrometer apparatus Photo-acoustic spectrometer apparatus

2011-04-12

2011-04-12

Larkin, Daniel S (Department: 2856)

Measuring and testing

Gas analysis

By vibration

C073S024060

Reexamination Certificate

active

07921693

ABSTRACT:
A photo acoustic detection cell (6) is located within the optical cavity (3) of a cavity enhanced absorption spectroscopy apparatus (3,4,5). When a sample in the cell (6) absorbs radiation from a pulsed radiation beam coupled into the cavity (3) pressure waves are generated that are detected by a microphone (9). A detected signal (10) output by the microphone (9) may be processed to determine a value for the concentration of an absorber in the sample.

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