Draw-wire displacement measurement is classified as a contact measurement method. Every draw-wire sensor consists of the basic wire elements, drum and spring motor (combined as mechanics) and a potentiometer or encoder for the measurement signal generation.
Draw-wire sensors are ideal for applications with large measuring ranges, small sensor dimensions and when a low cost solution is required. Depending on the sensor design, the wire is normally an extremely thin steel wire, which is sheathed with polyamide. The wire is around 0.8mm thick on average, depending on the type of stress forces involved.
Benefits of draw-wire sensors are:
- Very compact design compared to the measuring range
- Telescopic measurement principle
- Very robust sensors
- Measuring wire can be deflected using deflection pulleys
- Low cost solution
More information and some good applications are here http://www.micro-epsilon.com/download/products/cat--wireSENSOR-Application-Guide--en.pdf
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