Video
Eddy current sensors - operating principle and application examples
Eddy current sensors from Micro-Epsilon (eddyNCDT) measure distances, displacements, or positions of any electrically-conductive target. Eddy current sensors from Micro-Epsilon are ideally suited for applications in harsh industrial environments (pressure, dust, temperature). Furthermore, the eddy current sensors are integrated in semiconductor applications where submicron accuracy is demanded.
+ High precision and resolution
+ Non-contact and wear-free
+ Insensitive to dirt
+ Suitable for fast applications
+ Very good price/performance ratio
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http://www.micro-epsilon.com/displacement-position-sensors/eddy-current-sensor/index.html