A gap distance sensor is a device used to measure the distance between two objects or surfaces.Gap distance sensors are often used to monitor part seated monitoring, surface quality measurment, and clogging detection.
Feeler gauges, micrometers, and differential pressure sensors are traditionally used ito measure gaps or clearances in machine tools, parts, and fixtures. But these methods are unreliable since dirt and other debris cna affect the gap measurement.
ifm's SDP sensor uses compressed air to detect the distance between surfaces. The gap is calculated using pressure and flow, an innovative method that provides an absolute value of the gap distance.