Sensor for detecting fine particles such as smoke or dust contai

Details Sensor for detecting fine particles such as smoke or dust contai Sensor for detecting fine particles such as smoke or dust contai

1996-03-19

1997-12-02

Font, Frank G.

Optics: measuring and testing

For optical fiber or waveguide inspection

356438, 356439, 356338, G01N 2100

Patent

active

056942087

ABSTRACT:
An LD light-emitting circuit 2 comprises an analog multiplexer MP having a plurality of switches, and resistors R7, R8, R9 and R10 connected to these switches. When the temperature is not higher than a normal temperature, the resistor R7 is connected so that the amount of light emitted from the LD 1 is maintained constant. As the temperature rises, however, the resistor R8, R9 or R10 having increasing resistance is connected in response to a signal from a control circuit, in order to decrease the driving current that flows into the LD 1. This enables the LD 1 to suppress its own heating and to lengthen its life.

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