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. 894-7124
Mfr. Part No.SFH 7060
£2.92
Each (In a Pack of 5)
Units
- - 16ns 16ns - 12 Surface Mount Chip 7.2 x 2.5 x 0.9mm 0.9mm 7.2mm +85°C -40°C 2.5mm
RS Stock No. 168-5232
Mfr. Part No.SFH 7070
£1.029
Each (On a Reel of 1500)
Units
- - - - - - - - - - - - - -
RS Stock No. 168-5476
Mfr. Part No.SFH 9206
£0.363
Each (On a Reel of 1000)
Units
5mm Phototransistor 30µs 40µs 1 6 Surface Mount SMD 6.2 x 2.1 x 4.2mm 4.2mm 6.2mm +100°C -40°C 2.1mm
RS Stock No. 778-1396
Mfr. Part No.SFH 9206
£1.226
Each (In a Pack of 5)
Units
5mm Phototransistor 30µs 40µs 1 6 Surface Mount SMD 6.2 x 2.1 x 4.2mm 4.2mm 6.2mm +100°C -40°C 2.1mm
RS Stock No. 876-8824
Mfr. Part No.SFH 9540
£1.97
Each (In a Pack of 10)
Units
- - - - - 4 Surface Mount - 13.46 x 6.8 x 10mm - - - - -
RS Stock No. 170-9507
Mfr. Part No.SFH 9540
£1.401
Each (In a Tube of 70)
Units
- - - - - 4 Surface Mount - 13.46 x 6.8 x 10mm - - - - -
RS Stock No. 170-9657
Mfr. Part No.SFH 9206-5/6
£0.392
Each (On a Reel of 1000)
Units
1 → 5mm Phototransistor 30µs 40µs - 6 Surface Mount - 4.2 x 3.4 x 2.1mm 2.1mm 4.2mm +100°C -40°C 3.4mm
RS Stock No. 915-4917
Mfr. Part No.SFH 9206-5/6
£1.088
Each (In a Pack of 10)
Units
1 → 5mm Phototransistor 30µs 40µs - 6 Surface Mount - 4.2 x 3.4 x 2.1mm 2.1mm 4.2mm +100°C -40°C 3.4mm
RS Stock No. 170-9658
Mfr. Part No.SFH 9206-6/7
£0.392
Each (On a Reel of 1000)
Units
1 → 5mm Phototransistor 30µs 40µs - 6 Surface Mount - 4.2 x 3.4 x 2.1mm 2.1mm 4.2mm +100°C -40°C 3.4mm
RS Stock No. 915-4926
Mfr. Part No.SFH 9206-6/7
£1.088
Each (In a Pack of 10)
Units
1 → 5mm Phototransistor 30µs 40µs - 6 Surface Mount - 4.2 x 3.4 x 2.1mm 2.1mm 4.2mm +100°C -40°C 3.4mm