Photoelectronic Sensors Rochester nstitute of Technology光电传感器罗彻斯特理工学院.pptVIP

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Photoelectronic Sensors Rochester nstitute of Technology光电传感器罗彻斯特理工学院.ppt

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Photoelectronic Sensors Rochester nstitute of Technology光电传感器罗彻斯特理工学院

PHOTOELECTRONIC SENSORS Diffuse Sensors (proximity mode)? Transmitted beam (through beam)? Retro-reflective DIFFUSE SENSOR Rely on sensing light reflected off a target object Standard, Sharp Cutoff, Background Suppression, Fixed Focus, and Wide Angle TRANSMITTER-RECEIVER (THROUGH)? Comprised of a light source and a sensor to detect its beam. Both parts require a power source, can come from different supplies. When a part passes between the transmitter and receiver, the beam is broken and the sensor sends a signal to the automation controller IR, laser, LED Dark and Light Applications /be130.html?L=1country=US RETROREFLECTIVE The transmitter and receiver are incorporated into a single housing. A reflector is mounted opposite to the sensor and returns transmitted light back to the receiver. The effective beam describes the area that must be completely interrupted in order to reliably sense a target and it increases as the distance between the sensor and reflector increases. When the target is directly in front of the reflector, it must be at least as large as the reflector. Smaller objects can be detected if they are located closer to the sensor and they are at least as large as the optics. Dark and Light Applications SUMMARY Transmitter-Receiver is not valid because of mounting limitations. Diffuse requires background suppression – expensive Retro-reflective is picky and hard to mount, but might prove to be most reliable. Sensitivity is issue. /catalogs/sensors/index_prodtype.html All require an A/D converter Different power supplies Reliability has been questioned (due to errors in mounting) WEBSITES /article/a-background-check-for-photoelectric-sensors-0519 /title/Photoelectric%2520sensor /sensors/sensorstoday/nov01/techtalk/index.html /2008/06/basics-of-ir-transmitter-and-receiver.html /library/circuits/sensors_prox.html /ifmus/web/pinfo1_40_10_40_20.htm COMPARISON Sensor Type Difference Advantages Disadvantages Diffuse (general) Sensative to reflective,