Light-operated proximity detector with linear output [electronic resource]
Light-Operated; Proximity; Detector; Linear; Output; Light-Operated; Proximity; Detector; Described; Reflected; Light; Intensity; Surface; Proximity; Detector; Gauged; Translated; Directly; Signal; Proportional; Distance; Detector; Surface; Phototransistor; Sense; Reflected; Light; Connected; Detect...
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| Online Access: |
Online Access |
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| Main Authors: | , |
| Corporate Author: | |
| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Oak Ridge, Tenn. : Oak Ridge, Tenn. :
Oak Ridge National Laboratory. ; distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
1985.
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| Summary: | Light-Operated; Proximity; Detector; Linear; Output; Light-Operated; Proximity; Detector; Described; Reflected; Light; Intensity; Surface; Proximity; Detector; Gauged; Translated; Directly; Signal; Proportional; Distance; Detector; Surface; Phototransistor; Sense; Reflected; Light; Connected; Detector; Circuit; Maintains; Phototransistor; Saturated; Negative; Feedback; Arrangement; Operational; Amplifier; Connected; Collector; Emitter; Transistor; Provides; Output; Output; Amplifier; Linearly; Proportional; Proximity; Surface; Detector; Containing; Transistor; Direct; Proportional; Conversion; True; Light; Intensity; Varying; Proximity; Proportion; Square; Inverse; Distance; Detector; Measuring; Distance; Remotely; Target; Surface; Detector Circuit; Signal Proportional; Target Surface; Light Intensity; Light Intensity; Reflected Light; Reflected Light; Operational Amplifier; Proximity Detector; Proximity Detector; Negative Feedback; Detector Containing; Amplifier Connected; Direct Proportion; Feedback Arrangement; Light-Operated Proximity; Light-Operated Proximity. |
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| Abstract: | A light-operated proximity detector is described in which reflected light intensity from a surface whose proximity to the detector is to be gauged is translated directly into a signal proportional to the distance of the detector from the surface. A phototransistor is used to sense the reflected light and is connected in a detector circuit which maintains the phototransistor in a saturated state. A negative feedback arrangement using an operational amplifier connected between the collector and emitter of the transistor provides an output at the output of the amplifier which is linearly proportional to the proximity of the surface to the detector containing the transistor. This direct proportional conversion is true even though the light intensity is varying with the proximity in proportion to the square of the inverse of the distance. The detector may be used for measuring the distance remotely from any target surface. |
| Item Description: | Published through SciTech Connect. 01/01/1985. "us 4516020" McNeilly, David R.; Simpson, Marc L. |