Method of sample valuation based on the measurement of photother

Details Method of sample valuation based on the measurement of photother Method of sample valuation based on the measurement of photother

1995-03-24

1997-04-08

Epps, Georgia Y.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356349, 356432, G01B 902

Patent

active

056193262

ABSTRACT:
A sample evaluation method based on the measurement of photothermal displacement in which two exciting light beams and two measuring light beams are produced by a laser source, the exciting beams are rendered intensity modulation in opposite phase relationship by an acoustic-optic modulator and illuminated to different positions of a sample, the measuring beams are provided with different oscillation frequencies by acoustic-optic modulators and illuminated to the irradiation positions of the exciting beams correspondingly, the reflected lights of measuring beams from the sample are merged so as to interfere with each other, and the sample is evaluated based on the phase of the interference light. The method is capable of measuring the photothermal displacement accurately and stably without implementing intricate signal processings.

REFERENCES:
patent: 5083869 (1992-01-01), Nakata et al.
patent: 5298970 (1994-03-01), Takamatsu et al.
patent: 5377006 (1994-12-01), Nakata
patent: 5479259 (1995-12-01), Nakata et al.
Huang et al, "Dual-Probe Interferometer", Sep. 1991, Journal of Acoustical Society of America, pp. 1269-1274.
Applied Optics, vol. 22, No. 18, Sep. 15, 1983, pp. 2882-2886, L. C. M. Miranda, "Photodisplacement Spectroscopy of Solids: Theory".

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