The POSIWIRE® WS21 cable extension sensor from ASM (Elmhurst, IL) is equipped with a non-contact, magnetic multi-turn-encoder that enables long measuring lengths up to 20,000 mm. Typical applications include linear measurements for crane booms.

The sensor uses a specially designed and calibrated measuring cable that is wound in a single layer onto a precision manufactured drum, which transforms the linear movement of the cable into a rotary movement. An angle sensor, such as a potentiometer or a digital encoder, finally converts the motion into an electrical output signal.

Resistant to shock (100g/11ms), vibration (20g 10Hz-2kHz), water, moisture, and condensation, the POSIWIRE® WS21 sensors operate in outdoor applications with large fluctuations in temperature.

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NASA Tech Briefs Magazine

This article first appeared in the February, 2016 issue of NASA Tech Briefs Magazine.

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