- Ultrasonic sensors
Many strengths, few limits: How ultrasound technology works
Ultrasonic sensors detect all sound-reflecting objects. To calculate the distance, they measure the time between sending and receiving a reflected sound signal. The target’s colour, transparency and surface reflectivity are irrelevant.
Comparison of ultrasonic sensors with other position sensing products
This chart rates the performance of various technologies with certain influences.
|Great distance to the object|
|Independent of colour / transparency||1|
|Independent of material|
|Deposits on the sensor||2||3|
|Extraneous light immunity|
|High ambient humidity|
1) e.g. thin, clear-transparent film/glass
2) if not excessive
3) if non-conductive