Detect transparent objects with a sensor

Transparent object detection

Transparent objects pose special challenges for sensors because their low absorption rates require very high switching sensitivity and accuracy. SensoPart offers special retroreflective photoelectric sensors (FR 25-RGO)as well as ultrasonic sensors (UT 20, UT 20 Soundpipe, UMT 30 and cylindrical housings) for the reliable detection of such objects. This permits the reliable detection of transparent objects of any shape, and made of any material.


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FR 25-RGO reflector photoelectric sensor | SensoPart
Detection of transparent objects | FR 25-RGO | SensoPart

Checking the presence of bottles in a filling plant

The FR 25-RGO retroreflective photoelectric sensor detects transparent bottles in a filling plant.

  • Reliable detection of glass and transparent plastic using the autocollimation principle
  • Reliable detection of any bottle diameters and objects, e.g. small ampoules in the pharmaceutical industry
  • Trouble-free flat glass and foil detection
  • Operating range of up to 2 m, reliable detection from range of 0 mm
  • DELTA function: automatic adaptation of the sensor to changing ambient conditions


View FR 25-RGO reflector photoelectric sensor

Blue light sensors for detection of transparent objects

Detecting, counting and positioning transparent objects is soon a bridge too far for conventional photocells. Transparent objects such as glass and plastic only absorb a small part of the light and also cause a small difference between the transmitted light and the reflected light in the receiver. It is then an enormous challenge to transmit a stable and clear signal, for example, to automate a bottle filling line. 

Blue light sensors

Where conventional red light sensors reach their limit, SensoPart's Blue Light sensor offers the solution. Instead of a standard red light spot, a blue light spot is used. Because of the blue light the sensor is able to recognise transparent and dark objects.


Read more about blue light sensors

Sensor with blue light - SensoPart

Blue light sensors for detection of transparent objects

More applications

UT 20 Soundpipe ultrasonic sensorsin cuboid housings and the
UMT 30 ultrasonic sensorreliably detect transparent objects in
various industrial sectors.

  • Reliable detection of ampoules in the pharmaceutical industry
  • Dependable monitoring of blister packages for tablets
  • Reliable detection of transparent foils in the print industry
  • Control of pallet packaging plants with transparent stretch foil

The ultrasonic sensor with sound cone UT 20-S from Sensopart has a very compact cubic shape. The narrow sound cone allows objects to be detected through the smallest openings and drilled holes with a diameter of less than 5 mm. Read more about ultrasonic sensors. 


View ultrasonic sensors with and without sound cone

Ultrasonic sensor UT20 | SensoPart