Abstract

The photoacoustic technique is used to measure absorption spectra for various samples and is confirmed theoretically and experimentally to be suitable for condensed opaque samples by a gas-microphone method. For liquid samples including suspended matter, however, scattered optical radiation impinges on the surface of the transducer for detecting a photoacoustic signal and generates spurious noise. Consequently, photoacoustic measurement has not been applied directly to the samples including suspended matter.

© 1988 Optical Society of America