Length and position sensors
What range needs to be measured?
The first question to ask yourself is the range within which you want to measure. Does it have to be accurate down to the millimeter or even micrometer, or will an accuracy in centimeters or even meters suffice? For each range, there is an appropriate type of sensor. If you need highly accurate measurements, for example, it is best to look at linear encoders, proximity sensors and high-accuracy distance sensors. Almost all types of sensors are suitable for measuring distances and lengths of up to around a meter. The most common methods are optical, inductive, magnetic and capacitive. For longer distances, time-of-flight methods such as ultrasonics, lidar and radar are more suitable.
Environmental influences
An important second factor is the environment in which the sensor will be used. For example, if the environment is dirty, an optical sensor is unlikely to be your first choice. A magnetic sensor will not work properly near a permanent magnet, and in this case an inductive sensor would be the better choice.
Need some help?
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