Pulse coded optical attenuation meter

Details Pulse coded optical attenuation meter Pulse coded optical attenuation meter

1982-05-21

1985-06-04

Rosenberger, R. A.

Optics: measuring and testing

For light transmission or absorption

356 731, 250214L, G01N 2100

Patent

active

045211159

ABSTRACT:
An attenuation measuring system includes a transmitter for generating and transmitting a signal from a first position to a second position, and a receiver adapted to receive the signal at the second position. One of the transmitter and the receiver includes a simple log converter circuit which permits the conversion of an analog signal to a digital signal, so that a time uniform train of pulses is developed, the pulses decreasing in amplitude by equal decibel values. The receiver includes a counter which is counted down from a preset value. The count of the counter is a direct measurement of the loss through a coupling medium between the transmitter and the receiver. The analog-to-digital conversion can be accomplished in either the transmitter or the receiver. When embodied in the receiver, the attenuation meter also can function as an optical power meter.

REFERENCES:
patent: 3528749 (1970-09-01), Bowker
patent: 3746864 (1973-07-01), Tick et al.
patent: 3755679 (1973-08-01), Otsuka
patent: 3765778 (1973-10-01), Bey et al.
patent: 3901600 (1975-08-01), Johnson et al.
patent: 4124301 (1978-11-01), Pocock
patent: 4234253 (1980-11-01), Higginbotham et al.

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