High-temperature eddy-current displacement sensor temperature compensation method based on temperature online measurement and sensing device

Abstract

The invention discloses a high-temperature eddy-current displacement sensor temperature compensation method based on temperature online measurement and a sensing device. The high-temperature eddy-current displacement sensor temperature compensation method is characterized in that based on the input-output characteristics of a high-temperature eddy-current displacement sensor before temperature compensation, according to the environment temperature, measured by a temperature sensor, of the eddy-current displacement sensor, the sensitivity of the sensor within the whole linear working range is automatically adjusted through an automatic temperature-drifting-sensitivity correcting circuit in a front-arranged device, compensation is carried out on the sensitivity of the sensor at different temperatures, and therefore the influences of the environment temperature of the sensor on the sensitivity of the sensor are reduced; compensation is carried out on temperature drifting of the eddy-current displacement sensor at any reference point within the linear working range in the mode that the automatic temperature-drifting-sensitivity correcting circuit in the front-arranged device automatically outputs a voltage signal, and therefore the output of the eddy-current displacement sensor at the reference points can not be influenced by the environment temperature of the sensor.

Description

technical field [0001] The invention belongs to the technical field of eddy current displacement measurement, and in particular relates to a temperature compensation method and a sensing device for a high temperature eddy current displacement sensor based on online temperature measurement. Background technique [0002] The eddy current displacement sensor has been widely used in the detection field due to its advantages of non-contact, large measurement range, high sensitivity, simple structure, and not affected by non-metallic materials. The eddy current displacement sensor converts the displacement signal between the probe coil and the measured material into an electrical signal for output through the electromagnetic coupling between the probe coil and the measured material. It is generally composed of a probe, a high-frequency cable and a front end, and these three parts can also be integrated in the probe shell to form an integrated structure. [0003] The probe of an o...

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Problems solved by technology

The effect of the first method is limited. Although the second method can achieve better results, it is difficult to implement because of its complex structure. Although the third method can achieve better results, there are not many technical solutions currently proposed.

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