A photoelectric bundle, or photo eye, is an apparatus used to find the distance, absence, or presence of an object by using a light-emitting, often infrared, and photoelectric receiver. They are mostly used in the manufacturing industry. There are three different types of useful: opposed (through the beam), retro-reflective, and distance-sensing (propagated).
Video Photoelectric sensor
Jenis
An independent photoelectric sensor contains optics, along with electronics. It just needs resources. The sensor performs its own modulation, demodulation, amplification, and switching output. Some standalone sensors provide options such as timers or default control counter. Due to technological advances, independent photoelectric sensors are becoming smaller.
The remote photoelectric sensors used for remote sensing contain only the optical components of a sensor. Circuits for power input, amplification, and switching output are located elsewhere, usually in the control panel. This allows the sensor itself, to be very small. Also, controls for sensors are more accessible, as they may be larger.
When space is limited or the environment is too hostile even for remote sensors, optical fiber can be used. Optical fiber is a passive mechanical sensing component. They can be used with a remote or self-censored sensor. They have no electrical circuits and no moving parts, and can safely channel light into and out of unfriendly environments.
Maps Photoelectric sensor
Sensing mode
A through the beam arrangement consists of a receiver located within the line-of-sight of the transmitter. In this mode, the object is detected when the light beam is blocked from reaching the receiver of the transmitter.
The retroreflective arrangement places the transmitter and receiver in the same location and uses the reflector to reflect back-up rays from the transmitter to the receiver. An object is felt when the file is interrupted and fails to reach the receiver.
Proximity-sensing (diffused) settings are settings where transmitted radiation must reflect objects to reach the receiver. In this mode, the object is detected when the recipient sees the transmitted source than it was when it failed to see it. As with retro-reflective sensors, diffuse transmitters and receivers are located in the same housing. But the target acts as a reflector, so light detection is reflected from the object of interference. The emitter sends a beam of light (most often a pulsating infrared, visible red, or laser) that diffuses in all directions, filling the detection area. The target then enters the area and diverts the part of the beam back to the receiver. Detection occurs and the output is turned on or off when enough light falls into the receiver.
Some eye pictures have two different operational types, operate light and dark operate. Light operates an eye photo to be operational when the receiver "receives" the transmitter signal. Dark photo eyes operate operational when the receiver "does not receive" the transmitter signal.
The range detecting the photoelectric sensor is the "field of view", or the maximum distance from which the sensor can retrieve information, minus the minimum distance. Minimum detectable objects are the smallest objects that the sensor can detect. More accurate sensors can often have detected objects of at least a very small size.
Intermediate Differences
See also
- Sensor list
- Photodetector
- Sensors
References
- Guides for Sensing , 2002, Banner Engineering Corporation, P/N 120236
- http://sensors-transducers.globalspec.com/LearnMore/Sensors_Transducers_Detectors/Proximity_Presence_Sensing/Photoelectric_Sensors
Source of the article : Wikipedia
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