Optical-modulation-type sensor and process instrumentation appar

Details Optical-modulation-type sensor and process instrumentation appar Optical-modulation-type sensor and process instrumentation appar

1995-12-27

1997-12-16

Le, Que

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023111, 324 96, G02F 101

Patent

active

056988478

ABSTRACT:
An optical-modulation-type sensor comprises an input condenser lens for collecting light from a light source, a polarizer for linearly polarizing the light from the input condenser lens, a light-transmissive piezo-oscillator which is provided with an oscillator circuit and to which the linearly polarized light is introduced from the polarizer, an analyzer for linearly polarizing the light from the piezo-oscillator, and an output condenser lens for converging the linearly polarized light from the analyzer. A process instrumentation apparatus using the sensor of the structure described above further comprises an optical fiber for transmitting the light from the light source to the optical-modulation-type sensor, a photoelectric converter operatively connected to an output side of the optical-modulation-type sensor for converting to an electrical signal the transmitted light which is intensity modulated with the oscillation frequency of the piezo-oscillator, and a signal processing unit for acquiring a process quantity based on the frequency of an output signal from the photoelectric converter.

REFERENCES:
patent: 3681688 (1972-08-01), Hermstein et al.
patent: 5053617 (1991-10-01), Kakizaki et al.
patent: 5153427 (1992-10-01), Takahashi et al.
patent: 5165045 (1992-11-01), Eselun
J. At. Energy Soc. Japan, vol. 35, No. 2, pp. 1-9, Masanori ARITOMI, et al., "Various Pressure Measurement Technologies In Nuclear Engineering", Jan. 1993.

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