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Difference between revisions of "Optical Proximity Sensors"
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Optical Proximity Sensors (view source)
Revision as of 22:26, 11 December 2012
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[[File:Optical proximity sensor.jpg|thumb|right|Optical Proximity Sensors]] | [[File:Optical proximity sensor.jpg|thumb|right|Optical Proximity Sensors]] | ||
'''Optical Proximity Sensor''' is a device that uses the principle of triangulation of reflected infrared or visible light to measure small distances in a robotic system.Optical proximity sensors generally cost more than [[Inductive Proximity Sensors]], and about the same as capacitive sensors. They are widely used in automated systems because they have been available longer and because some can fit into small locations. These [[Sensors]]are more commonly known as light beam sensors of the thru-beam type or of the retro reflective type. | '''Optical Proximity Sensor''' is a device that uses the principle of triangulation of reflected infrared or visible light to measure small distances in a robotic system.Optical proximity sensors generally cost more than [[Inductive Proximity Sensors]], and about the same as capacitive sensors. They are widely used in automated systems because they have been available longer and because some can fit into small locations. These [[Sensors]] are more commonly known as light beam sensors of the thru-beam type or of the retro reflective type. | ||
A complete optical proximity sensor includes a light source, and a sensor that detects the light. The light source is supplied because it is usually critical that the light be tailored for the light sensor system. The light source generates light of a frequency that the light sensor is best able to detect, and that is not likely to be generated by other nearby sources. Infra-red light is used in most [[Optical Sensors]]. To make the light sensing system more foolproof, most optical proximity sensor light sources pulse the infra-red light on and off at a fixed frequency. The light sensor circuit is designed so that light that is not pulsing at this frequency is rejected. | A complete optical proximity sensor includes a light source, and a sensor that detects the light. The light source is supplied because it is usually critical that the light be tailored for the light sensor system. The light source generates light of a frequency that the light sensor is best able to detect, and that is not likely to be generated by other nearby sources. Infra-red light is used in most [[Optical Sensors]]. To make the light sensing system more foolproof, most optical proximity sensor light sources pulse the infra-red light on and off at a fixed frequency. The light sensor circuit is designed so that light that is not pulsing at this frequency is rejected. | ||