About The Author

Gerald J. Diebold is a professor at Brown University in the Department of Chemistry. His research areas include the photoacoustic effect, thermal diffusion, medical imaging, and vibration potential imaging. He received his B.S. in Physics from the University of Notre Dame in 1965 and his Ph.D. from Boston Colege in 1974.

Using Photoacoustic Moving Sources In Trace Gas Detection

The photoacoustic effect, which was discovered by A. G. Bell in 1881, refers to the generation of sound as a result of absorption of optical radiation. The effect takes place in gases, liquids, and solids following conversion of the optical energy into heating. For almost any material, heating causes an expansion, which, as a mechanical