Volume 77, Issue 11, November 2006
Index of content:
- THERMOMETRY; THERMAL DIFFUSIVITY; ACOUSTIC; PHOTOTHERMAL AND PHOTOACOUSTIC
Surface displacement measured by beam distortion detection technique: Application to picosecond ultrasonics77(2006); http://dx.doi.org/10.1063/1.2372739View Description Hide Description
A sensitive technique of surface displacement measurement without interferometry is proposed for the goals of picosecond ultrasonics. Simple description of detection mechanism is provided on the basis of paraxial approximation of light diffraction. Test experiments with gold and tungsten layers have been performed and analyzed. The efficiency of the technique is compared with interferometry and reflectometry methods.
77(2006); http://dx.doi.org/10.1063/1.2393160View Description Hide Description
A hybrid-type surfacetemperature sensor combines the contact and noncontact methods, which allows us to overcome the shortcomings of both methods. The hybrid-type surfacethermometer is composed mainly of two components: a metalfilm sheet that makes contact with an object and a radiometer that is used to detect the radiance of the rear surface of the metalfilm, which is actually a modified radiation thermometer.Temperature measurement using the hybrid-type thermometer with a several tens micrometer thick Hastelloy sheet, a highly heat and corrosion resistant alloy, is possible with a systematic error of and random errors of , in the temperature range from . This thermometer provides a useful means for calibration of in situtemperature measurement in various processes, especially in the silicon semiconductor industry. This article introduces the basic idea of the hybrid-type surface sensor, presents experimental results and discussions, and finally describes some applications.