Reflective Optical Sensors

Reflective optical sensors are photoelectrical sensors that are used to detect the presence or absence of objects, or measure the distance to those objects. They are a non-contact type of sensor, often used in the automation industry. They can be used to provide real-time information in a manufacturing setting in order to keep processes running smoothly.

How do reflective optical sensors work?

A reflector is positioned opposite the light sensor, and a light beam is passed back and forth between the two. When an object is present, the beam is interrupted, and the sensor will send an electrical signal to the output device.

In some cases, polarising filters may be needed if the objects being detected are themselves reflective. These allow the sensor to tell the difference between light reflected by the reflector and the object.

Advantages of using reflective optical sensors

The advantage of using a reflective optical sensor over a through beam sensor is that they are much easier and less time consuming to install. This is because the transmitter and receiver are housed within the same body.


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Description Price Peak Sensor Distance Output Device Typical Rise Time Typical Fall Time Number of Channels Number of Pins Mounting Type Package Type Dimensions Height Length Maximum Operating Temperature Minimum Operating Temperature Width
RS Stock No. 124-6800
Mfr. Part No.RPR-220
BrandROHM
HK$10.709
Each (In a Pack of 10)
units
6mm Phototransistor 10µs 10µs 1 4 Through Hole Radial 6.4 x 4.9 x 6.5mm 6.5mm 6.4mm +85°C -25°C 4.9mm
RS Stock No. 182-8037
Mfr. Part No.RPI-0125
BrandROHM
HK$3.324
Each (On a Reel of 750)
units
1.2mm Phototransistor 10µs 10µs 1 4 Surface Mount - 3.6 x 3.3 x 2.8mm 2.8mm 3.6mm +85°C -25°C 3.3mm
RS Stock No. 182-8107
Mfr. Part No.RPR-220PC30N
BrandROHM
HK$20.964
Each (In a Pack of 5)
units
6mm Phototransistor 10µs 10µs 1 4 Through Hole - 6.4 x 4.9 x 6.5mm 6.5mm 6.4mm +85°C -25°C 4.9mm
RS Stock No. 182-8087
Mfr. Part No.RPI-1035
BrandROHM
HK$10.80
Each (In a Pack of 5)
units
- Phototransistor 10ms 10ms 1 6 Surface Mount - 3.9 x 3.9 x 2.4mm 2.4mm 3.9mm +85°C -25°C 3.9mm
RS Stock No. 182-8092
Mfr. Part No.RPI-121
BrandROHM
HK$3.812
Each (In a Pack of 20)
units
1mm Phototransistor 10µs 10µs 1 4 Through Hole - 3.6 x 2.6 x 3.3mm 3.3mm 3.6mm +85°C -25°C 2.6mm
RS Stock No. 182-8042
Mfr. Part No.RPR-220PC30N
BrandROHM
HK$16.199
Each (In a Tube of 2500)
units
6mm Phototransistor 10µs 10µs 1 4 Through Hole - 6.4 x 4.9 x 6.5mm 6.5mm 6.4mm +85°C -25°C 4.9mm
RS Stock No. 182-6294
Mfr. Part No.BH1792GLC-E2
BrandROHM
HK$62.26
Each
units
- Photodiode - - 1 10 Through Hole - 2.8 x 0.9 x 2.8mm 2.8mm 2.8mm +85°C -20°C 0.9mm
RS Stock No. 182-8038
Mfr. Part No.RPI-1035
BrandROHM
HK$7.623
Each (On a Reel of 750)
units
- Phototransistor 10ms 10ms 1 6 Surface Mount - 3.9 x 3.9 x 2.4mm 2.4mm 3.9mm +85°C -25°C 3.9mm
RS Stock No. 182-6290
Mfr. Part No.BH1792GLC-E2
BrandROHM
HK$40.833
Each (On a Reel of 3000)
units
- Photodiode - - 1 10 Through Hole - 2.8 x 0.9 x 2.8mm 2.8mm 2.8mm +85°C -20°C 0.9mm
RS Stock No. 182-8100
Mfr. Part No.RPI-122
BrandROHM
HK$5.717
Each (In a Pack of 10)
units
0.8mm Phototransistor 10µs 10µs 1 4 Through Hole - 3.6 x 3.4 x 3.3mm 3.3mm 3.6mm +85°C -25°C 3.4mm
RS Stock No. 182-8041
Mfr. Part No.RPI-122
BrandROHM
HK$3.812
Each (In a Bag of 2000)
units
0.8mm Phototransistor 10µs 10µs 1 4 Through Hole - 3.6 x 3.4 x 3.3mm 3.3mm 3.6mm +85°C -25°C 3.4mm
RS Stock No. 124-6801
Mfr. Part No.RPR-220UC30N
BrandROHM
HK$15.724
Each (In a Pack of 5)
units
6mm Phototransistor 10µs 10µs 1 4 Through Hole Radial 6.4 x 4.9 x 6.5mm 6.5mm 6.4mm +85°C -25°C 4.9mm
RS Stock No. 182-8085
Mfr. Part No.RPI-0125
BrandROHM
HK$4.892
Each (In a Pack of 10)
units
1.2mm Phototransistor 10µs 10µs 1 4 Surface Mount - 3.6 x 3.3 x 2.8mm 2.8mm 3.6mm +85°C -25°C 3.3mm
RS Stock No. 182-8040
Mfr. Part No.RPI-121
BrandROHM
HK$2.58
Each (In a Bag of 2000)
units
1mm Phototransistor 10µs 10µs 1 4 Through Hole - 3.6 x 2.6 x 3.3mm 3.3mm 3.6mm +85°C -25°C 2.6mm