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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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庫存編號 908-7104
製造零件編號OPB730
BrandOptek
HK$66.12
單位
Barrel Diffuse Maximum of 6.35 mm Photodarlington 4-Wire Cable 2m - 1.5V Wire Lead LED - 50 mA - - Plastic
RS庫存編號 307-913
製造零件編號OPB704
BrandOptek
HK$21.30
單位
Block Retroreflective 3.8 mm NPN - - - Wire Lead Infrared - - - - Plastic
RS庫存編號 908-7126
製造零件編號OPB771TZ
BrandOptek
HK$65.78
單位
Barrel Diffuse 2.03 5.59 mm TTL Wire - 1.8V Wire Lead LED - 40 mA - - -
RS庫存編號 170-0724
製造零件編號OPB704W-Z
BrandOptek
HK$30.79
個 (以毎袋:100)
單位
Block Retroreflective 3.8 mm NPN 4-Wire Cable 0.61m - - - Infrared - - - - Plastic
RS庫存編號 908-7110
製造零件編號OPB745
BrandOptek
HK$24.18
單位
- - - - - - - - - - - - - -
RS庫存編號 627-6556
製造零件編號OPB704W-Z
BrandOptek
HK$32.13
單位
Block Retroreflective 3.8 mm NPN 4-Wire Cable 0.61m - - - Infrared - - - - Plastic
RS庫存編號 301-606
製造零件編號OPB706B
BrandOptek
HK$17.19
單位
Block Retroreflective 1.27 mm NPN - - - Wire Lead Infrared - - - - Plastic
RS庫存編號 908-7129
製造零件編號OPB750T
BrandOptek
HK$38.36
單位
- - - - - - - - - - - - - -
RS庫存編號 908-7116
製造零件編號OPB733TR
BrandOptek
HK$25.70
單位
- - - - - - - - - - - - - -
RS庫存編號 194-4018
製造零件編號OPB608A
BrandOptek
HK$13.04
單位
Block Retroreflective 1.27 9.525 mm NPN - - - Wire Lead Infrared - - - - Plastic
RS庫存編號 170-0725
製造零件編號OPB715-Z
BrandOptek
HK$52.499
個 (以毎袋:25)
單位
Block Retroreflective 12.7 mm - - - 5.25V Wire Lead LED - - - - Plastic
RS庫存編號 908-7090
製造零件編號OPB701ALZ
BrandOptek
HK$87.76
單位
- - - - - - - - - - - - - -
RS庫存編號 908-7163
製造零件編號OPB829DZ
BrandOptek
HK$32.06
單位
Block Through Beam (Fork) 3.18 8 mm Phototransistor Wire - 1.7V Wire Lead LED - 50 mA - - Plastic
RS庫存編號 908-7087
製造零件編號OPB700ALZ
BrandOptek
HK$77.00
單位
- - - - - - - - - - - - - -
RS庫存編號 908-7021
製造零件編號OP506A
BrandOptek
HK$6.762
/個 (每包:50個)
單位
- - - - - - - - - - - - - -
RS庫存編號 627-8388
製造零件編號OPB715-Z
BrandOptek
HK$53.59
單位
Block Retroreflective 12.7 mm - - - 5.25V Wire Lead LED - - - - Plastic