Microprocessor Based Light Bridge Sensors

Hal Philipp; Robert J. Marks II

doi:10.1117/12.947856

29 November 1988 Microprocessor Based Light Bridge Sensors

Hal Philipp, Robert J. Marks II

Proceedings Volume 0961, Industrial Optical Sensing; (1988) https://doi.org/10.1117/12.947856
Event: SPIE International Symposium on Optical Engineering and Industrial Sensing for Advance Manufacturing Technologies, 1988, Dearborn, MI, United States

Abstract

Modern photoelectric proximity sensors typically employ the use of a pulse modulated IR beam, a photodetector, amplifier, synchronous demodulator, and comparator to generate an output signal that indicates the presence of an object in the sense field (Figure 1). While these types of photoelectric controls generally work to acceptable performance levels at reasonable cost, they generally require a manual adjustment and high gain optics to achieve reasonable sensitivity and dynamic range. Adjustment is usually performed by setting amplifier gain; sometimes this is performed with an AGC circuit. The use of an amplifier gain adjustment has the drawback of limiting sensitivity and dynamic range under many normal operating conditions.

Citation Download Citation

Hal Philipp and Robert J. Marks II "Microprocessor Based Light Bridge Sensors", Proc. SPIE 0961, Industrial Optical Sensing, (29 November 1988); https://doi.org/10.1117/12.947856

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