Interferometric target detecting apparatus having a light source

Details Interferometric target detecting apparatus having a light source Interferometric target detecting apparatus having a light source

1996-01-05

1997-10-21

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356353, G01B 902

Patent

active

056802102

ABSTRACT:
An apparatus for eliminating scattered light from unscattered light (sign in the reflection from a laser-illuminated target and its ambient. The apparatus uses a laser selected for maximum Lorentzian to Gaussian mode content, a stable interferometer having an optical path difference twice the distance to the first zero in the Gaussian pattern of the scattered interferogram, and performs subtraction of the background or scattered interferogram from the unscattered or signal interferogram. The laser is multi-mode and the interferometer is a Fizeau wedge having an optical path difference equal to twice the distance to the first zero in the Gaussian interferogram. The method of making the apparatus is provided.

REFERENCES:
patent: 4259015 (1981-03-01), Wada
patent: 4744659 (1988-05-01), Kitabayashi

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