Optical sensing device

Details Optical sensing device Optical sensing device

1985-11-21

1990-08-14

Rosenberger, Richard A.

Optics: measuring and testing

By polarized light examination

With polariscopes

356 33, G02F 101

Patent

active

049482556

ABSTRACT:
An optically sensing device is made up of the sensor materials that cause the value of birefringence to vary itself in accordance with external physical volume; a polarizer and an element provided with two total reflection surfaces causing the beam path to invert its direction by an angle of 180.degree.. The optically sensing device has the capability of setting the phase bias by applying the two total reflection surfaces causing the beam path to invert its direction by an angle of 180.degree.. Since each element has different functions, one functioning as a mirror and the other as a quarterwave plate, the optically sensing device is of extremely simple structure and is compact. In addition, since the optically sensing device provides a constant phase bias unlike the unstable performances of conventional quarterwave plates, it guarantees high-precision performance. Also, the use of inexpensive elements ensures reduced cost. In particular, by effectively combining such selected materials featuring photoelastic and electro-optic effects, the optically sensing device embodied by the present invention is extremely effective for detecting the physical volume of a wide variety of substances.

REFERENCES:
patent: 3797940 (1974-03-01), King

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