Device having main and secondary optical sensors

Details Device having main and secondary optical sensors Device having main and secondary optical sensors

1989-07-18

1991-07-02

Wieder, Kenneth

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Using radiant energy

324105, 350355, G01R 3100

Patent

active

050288652

ABSTRACT:
The device of the invention comprises a main optical sensor (3) suitable for measuring a changing physical parameter, and a secondary optical sensor (6) suitable for measuring a disturbance which influences the measurement of said physical parameter, but for which the frequency spectrum is disjoint from that of the parameter. The sensors (3) and (6) are connected in series such that the main sensor serves to modulate the beam received by the secondary sensor.

REFERENCES:
patent: 3936742 (1976-02-01), Krause
patent: 4002975 (1977-01-01), Erickson et al.
patent: 4227082 (1980-10-01), Mayeux et al.
patent: 4269483 (1981-05-01), Feldtkeller
patent: 4539521 (1985-09-01), Matsumato
patent: 4612500 (1986-09-01), Chen et al.
patent: 4631402 (1986-12-01), Nagatsuma et al.
patent: 4752141 (1988-06-01), Sun et al.
patent: 4812767 (1989-03-01), Jaketoni

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