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.


...
Read more Read less

Filters

Viewing 1881 - 1900 of 1905 products
Results per page
Description Price Sensor Style Detection Type Detection Range Output Type Electrical Connection Maximum AC Voltage Maximum DC Voltage Terminal Type Light Source IP Rating Maximum Current Interface Response Time Housing Material
RS Stock No. 2509666303
Mfr. Part No.Q23SN6R
£88.26
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 2509666892
Mfr. Part No.S186E
£35.20
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 2509667003
Mfr. Part No.S18SN6LPQ
£77.51
Each
Units
- - - - - - - - - - - - - -
New
RS Stock No. 2552484722
Mfr. Part No.SOOD-TB-L-PN
BrandFesto
£171.47
Each
Units
- - - - - - - - - - - - - -
New
RS Stock No. 2552484732
Mfr. Part No.SOOE-RS-R-PNLK-T
BrandFesto
£66.22
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 2550981008
Mfr. Part No.E3ZM-LS84H 5M
BrandOmron
£152.00
Each
Units
- - - - - - - - - - - - - -
New
RS Stock No. 2552484717
Mfr. Part No.SOOD-BS-R-PN-30
BrandFesto
£105.24
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 2509665568
Mfr. Part No.Q45BB6LLPQ
£302.79
Each
Units
- - - - - - - - - - - - - -
New
RS Stock No. 2552484729
Mfr. Part No.SOOE-MS-R-PNLK-T
BrandFesto
£333.47
Each
Units
- - - - - - - - - - - - - -
New
RS Stock No. 2552484714
Mfr. Part No.SOOD-BS-L-PN-30
BrandFesto
£130.08
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 2509666280
Mfr. Part No.Q236E
£58.84
Each
Units
- - - - - - - - - - - - - -
New
RS Stock No. 2552484721
Mfr. Part No.SOOD-RS-R-PN
BrandFesto
£89.87
Each
Units
- - - - - - - - - - - - - -
New
RS Stock No. 2552484731
Mfr. Part No.SOOE-RS-L-PNLK-T
BrandFesto
£119.43
Each
Units
- - - - - - - - - - - - - -
New
RS Stock No. 2552484716
Mfr. Part No.SOOD-BS-L-PN-80
BrandFesto
£130.08
Each
Units
- - - - - - - - - - - - - -
New
RS Stock No. 2552484728
Mfr. Part No.SOOE-MS-L-PNLK-T
BrandFesto
£378.41
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 2550980444
Mfr. Part No.E3T-FT14-M5J 0.3M
BrandOmron
£118.80
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 2509666561
Mfr. Part No.SM2A312DQD
£111.61
Each
Units
- - - - - - - - - - - - - -
New
RS Stock No. 2552484720
Mfr. Part No.SOOD-RS-L-PN
BrandFesto
£117.07
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 2550228823
Mfr. Part No.XUYFLNEP100120
£201.68
Each
Units
- - - - - - - - - - - - - -
RS Stock No. 2509667902
Mfr. Part No.LM1
£26.54
Each
Units
- - - - - - - - - - - - - -
Related Products
Omron E3Z-IL photoelectric sensors with IO-Link connectivity offer ...
Description:
Omron E3Z-IL photoelectric sensors with IO-Link connectivity offer reliable detection. IO-Link connectivity makes sensor level information visible and notifies of faults and problems in the Sensor in real time. IO-Link compatibleIP67 ratedSmall dead-band for sensing close targetsRetro-reflective versions have polarised light source for shiny object detectionShort circuit and reverse polarity ...
Allen Bradley 42JT VisiSight photoelectric sensors offer a ...
Description:
Allen Bradley 42JT VisiSight photoelectric sensors offer a small rectangular package with visible light beam for ease of alignment and industry standard mounting hole spacing. Each model offers PNP or NPN and light operate or dark operate outputs. IO-Link enabled sensors offer advanced features and diagnostics including Automatic Device Configuration, ...
Six sensing methodsCable model (three cable lengths) and ...
Description:
Six sensing methodsCable model (three cable lengths) and M8 connector models are available.NPN output, PNP output, light ON, dark ON can be selected.Sensing range doubled with SA1E-T through-beam and SA1E-P polarized retro-reflective models.Highly stable with excellent resistance against vibration and shock resistance.Coaxial polarized retro-reflective model (SA1E-X) ensures stable detection, unaffected ...
Six sensing methodsCable model (three cable lengths) and ...
Description:
Six sensing methodsCable model (three cable lengths) and M8 connector models are available.NPN output, PNP output, light ON, dark ON can be selected.Sensing range doubled with SA1E-T through-beam and SA1E-P polarized retro-reflective models.Highly stable with excellent resistance against vibration and shock resistance.Coaxial polarized retro-reflective model (SA1E-X) ensures stable detection, unaffected ...