8 ITMP3 / 8éme conférence internationale de photoacoustique et photothermique
J. Phys. IV France 04 (1994) C7-79-C7-82
A new beam deflection angle amplification technique for mirage detectionA. Yarai1, Y. Fukunaga1, K. Sakamoto1 and T. Nakanishi1
1 Department of Electrical Engineering and Electronics, Faculty of Engineering, Osaka Sangyo University, Daito, Osaka, Japan
A new technique has been developed for amplification of the photothermal beam deflection angle for mirage detection. This technique, based on a very simple operating principle, uses a cylindrical reflection mirror. The use of a new amplifier provided a signal-to-noise ratio approximately 10 times that obtained without the amplifier for equipment of the same size. By using the new amplifier, a mirage signal was obtained when a transistor array processed on a silicon wafer was measured.
© EDP Sciences 1994