Abstract

In conventional optoacoustic spectroscopy, an incident laser beam is absorbed by the sample, the radiant energy is converted to heat, and the sample undergoes thermal expansion, generating an acoustic wave which is detected. The incident light is from either a cw modulated or a pulsed laser. In the former case, phase-sensitive detection of the resultant acoustic wave is performed by a lock-in amplifier; while in the latter case, data acquisition is done by some means suited to the pulsed nature of the experiment—for example, with a boxcar averager. In either case, the intensity of the acoustic signal is monitored and yields the desired information. Optoacoustic techniques offer one of the most sensitive diagnostic methods available today.

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