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Position sensors measure position and include transducers, encoders, and potentiometers. They can be linear or angular, relative or absolute. Examples include proximity sensors and eddy current sensors, used in machines like coin-operated washers. Other examples include grating sensors, linear encoders, and rotary encoders. They are used in various appliances, machinery, and commercial environments.
Position sensors are a range of devices which are used to obtain an exact or approximate measurement of position. Sensors of this type include transducers, encoders, and potentiometers. Depending on the particular type of position sensor involved, the measurement can be linear or angular in nature and can be classified as relative or absolute.
There are several examples of position sensors. One is known as a proximity sensor and is used to detect the presence of nearby objects without the need to actually come into direct contact with the objects. A common design for this type of position sensor is to include two sections or components that can be moved. For example, a sensor designed to monitor the sashes of a window could be positioned so that it can determine whether the window has been opened, based on the distance between the two halves. From this point of view, the sensor can be used as part of the security system, facilitating the monitoring of the state of all windows equipped with proximity sensors.
An eddy current sensor is another example of this type of electronic device. This form of position sensor works by responding to changes in the magnetic field, using the leads to notice the change. A common example of how this type of sensor works is found in machines that receive and dispense coins. Thanks to the readings of the device, it is possible to identify if real coins have been inserted into the machine, or if a snail or other unrecognized object that is approximately the same size as a coin has been inserted. This in turn can trigger an automated response rejecting the fake coin. A position sensor of this type is often found in machines such as coin-operated washers and dryers, as well as many automated services that require customers to insert coins in exchange for a good or service.
There are many other examples of position sensors, including grating sensors, linear encoders, and rotary encoders. While the application of each type of sensor is slightly different, all use magnetic fields to ascertain or measure aspects of objects, which in turn achieves a desirable end. A position sensor can be used in a number of appliances used in the home as well as heavy machinery used in manufacturing plants and even in many retail and commercial environments.
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