Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-02-10
1990-07-24
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022717, H01J 516
Patent
active
049437143
ABSTRACT:
To enable a continuous measurement of damping of a light beam in light wave conductor (LWC)-sensor which is accessible at one end only, a measuring light beam emitted by a transmitter is guided through a light wave conductor into a beam divider in which a measuring partial light beam is guided in the same direction as the transmitted beam to a measuring LWC-sensor. At the free end of the sensor the measuring partial light beam is totally reflected to propagate in reverse direction back against the beam divider where it is deflected by 90.degree. and guided into a light receiving and measuring unit. The other partial light beam is employed either for the temperature compensation or for the compensation of the power output of the light transmitter or of sensitivity of the light receiver.
REFERENCES:
patent: 4492860 (1985-01-01), Brogardh et al.
patent: 4644154 (1987-02-01), Brogardh et al.
patent: 4703175 (1987-10-01), Salour et al.
patent: 4750139 (1988-06-01), Dils
patent: 4757194 (1988-07-01), Simms
Federmann Helmut
Kraus Anton
Levacher Friedrich K.
Noack Georg
Felten & Guilleaume Energietechnik AG
Nelms David C.
Striker Michael J.
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