Eddy current displacement sensor

Abstract

The present invention discloses an eddy current displacement sensor. The eddy current displacement sensor comprises a probe, a proximitor and a signal cable (105) connected with the probe and the proximitor. The probe includes a sensor housing (101) and a testing coil (100) and a compensation coil (103) which are internally arranged in the sensor housing (101) in a difference structure; the probe is configured to differentially output difference signals of the testing coil (100) and the compensation coil (103) when a metal detection surface to be detected (300) changes the displacement; and the proximitor is configured to perform signal processing of the difference signals and output the detection result of the displacement changing of the metal detection surface to be detected (300). According to the scheme of the invention, the defects may be overcome that few functions, large size, poor temperature adaption capability and the like in the prior art, and the beneficial effects may be realized that a lot of functions, small size and good temperature adaption capability.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to an eddy current displacement sensor, in particular to a high temperature and high pressure resistant eddy current displacement sensor. Background technique [0002] A sensor is a detection device that can sense the measured information and convert the sensed information into electrical signals or other required forms of information output according to certain rules. The eddy current displacement sensor is a non-contact sensor, which has the characteristics of fast response speed, high resolution, oil pollution resistance, etc. It is widely used in displacement measurement, non-destructive flaw detection, thickness measurement, etc. Due to the influence of pressure, in different temperature and pressure environments, the test results will drift, resulting in inaccurate testing, which limits the application of eddy current sensors in temperature and pressure environments. [0003]...

AI Technical Summary

Problems solved by technology

Its probe assembly has only one induction coil without corresponding temperature compensation design, so it cannot be used in places with high temperature and temperature changes, and its printed board assembly is built into the probe, resulting in a large probe volume, and the electronics on the printed board assembly Components will also be affected by the ambient temperature, exacerbating the temperature drift effect

[0004] In the existing technology, there are defects such as few functions, large volume and poor temperature adaptability

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