Photoelectric Sensors

Photoelectric sensors detect and measure physical objects or quantities by emitting a field or beam of electromagnetic radiation, an object is detected by measuring alterations in the return signal. There are 3 main types of photoelectric sensors which provide reliable detection, these are through-beam, retro-reflective and diffuse. The basic function of each is to detect the presence or absence of objects or measure the distance to the object.


Through-beam Sensors


Through-beam sensors (aka thru-beam) rely on two separate housings, one for the transmitter and one for the receiver, with the transmitter providing a continuous beam of light to the receiver. Each time an object passes through the beam this interrupts the signal between the transmitter and receiver, which in turn causes the receiver to send an electrical signal to the output. Through-beam sensors are suited to long-distance sensing and are capable of detecting almost any object, irrespective of colour or angular motion.


Retro-reflective Sensors


Retro-reflective photoelectric sensors (retroreflective) have both the transmitter and receiver contained within the same housing but require a reflector opposite to the sensor. The reflector bounces the light beam back to the transmitter until an object breaks the beam. Objects which are highly reflective such as aluminium require sensors with polarising filters. The filter allows the sensor to acknowledge that the reflected light from reflecting materials is different from the reflector.


Diffuse Sensors


Diffuse sensors (proximity sensor) are easier to install as only one device has to be mounted. This is because the transmitter and receiver are contained within one housing. Diffuse sensors use the reflection from the target object within a predetermined sensing range. The transmitter sends out a continuous beam of light, once this hits the target it is diffused in all directions, a part of this light is reflected back and recognised by the receiver, the receiver then sends an electrical signal to the output.


A special type of diffused mode is background suppression which enables the user to precisely control the sensing range. A diffuse mode sensor with background suppression is less sensitive to the target colour. They can also use a visible red light or infrared light sources.


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RS Stock No. 2509667435
Mfr. Part No.VS3AN5XLP
TWD4,494.00
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RS Stock No. 2508470069
Mfr. Part No.MPL2HD
TWD5,937.00
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RS Stock No. 2509666791
Mfr. Part No.SMU315D
TWD5,450.00
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RS Stock No. 2509665827
Mfr. Part No.MA5
TWD3,892.00
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RS Stock No. 2509666785
Mfr. Part No.SMU31R
TWD4,684.00
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RS Stock No. 2509666779
Mfr. Part No.SMU31E
TWD4,063.00
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RS Stock No. 2509665293
Mfr. Part No.SM2A912LVAGQD
TWD7,496.00
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RS Stock No. 2509666656
Mfr. Part No.SM312LP
TWD4,589.00
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RS Stock No. 2509665271
Mfr. Part No.SM312LVQDP
TWD4,637.00
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Mfr. Part No.LM5-14
TWD4,610.00
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RS Stock No. 2509666943
Mfr. Part No.S18SN6FF100
TWD4,063.00
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RS Stock No. 2509665574
Mfr. Part No.SM2A912LVQD
TWD7,124.00
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Mfr. Part No.SM31EL
TWD3,108.00
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Mfr. Part No.MPSD11HD
TWD6,644.00
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RS Stock No. 2509664773
Mfr. Part No.LM5R
TWD3,841.00
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RS Stock No. 2509203523
Mfr. Part No.VL18-54-M/40A/118/128
TWD5,183.00
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RS Stock No. 2509667047
Mfr. Part No.S18SN6DQ
TWD2,689.00
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RS Stock No. 2509667075
Mfr. Part No.S18RW3R
TWD2,868.00
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RS Stock No. 2550074522
Mfr. Part No.T30SN6FF200Q
TWD4,207.00
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RS Stock No. 2508470110
Mfr. Part No.MPS32HD
TWD4,430.00
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