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Updated: Feb 11, 2026

Photoacoustic Cystography
Published on: June 11, 2013
Emissivity determination using the photoacoustic effect
Abstract:
We show that emissivities in the near infrared can be determined relative to a reference surface employing the photoacoustic effect. The photoacoustic cell is equipped with two windows and a pair of synchronously moving chopping wheels so that the cell alternately views the test and the reference surface. The acoustic signals produced in the cell are detected with a microphone and that output is fed to a lock-in amplifier. The temperature of the test surface is varied to produce a null in the lock-in amplifier, which permits determination of a relative emissivity. Results of measurements for several plastic and metal surfaces are reported.
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