Optics: measuring and testing – For light transmission or absorption
Patent
1989-07-24
1992-01-28
Rosenberger, Richard A.
Optics: measuring and testing
For light transmission or absorption
356358, G01N 2100
Patent
active
050838695
ABSTRACT:
A photoacoustic signal detecting device irradiates a modulated light on a sample using focusing means, detects a photoacoustic signal created in the sample using light interference detection means and finally displays the information relative to the surface and inside of the sample. The focusing means and light interference detection means are constructed in a confocal optical system, respectively, and a pin-hole is used to remove unnecessary high order diffraction light components around the light spot of the modulated light so that the photoacoustic signal can be detected with a high accuracy. Further, an auto-focusing function is added to the photoacoustic signal detection so that the photoacoustic signal can be detected with a high accuracy also for a sample with rugged surface.
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Kembo Yukio
Nakata Toshihiko
Hitachi , Ltd.
Rosenberger Richard A.
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