Eddy current probe for realizing automatic zero setting function by using Hall element and control method thereof

Abstract

The invention provides an eddy current probe for realizing an automatic zero setting function by utilizing a Hall element and a control method thereof. The probe comprises the Hall element, an exciting coil, a numerical control phase shifter, a phase difference measuring circuit, an amplitude measuring circuit, a controller, a numerical control amplitude regulator, a zero setting trigger circuit, a reference piece and a subtracter, the zero setting function of the probe can be achieved only through one Hall element, the problem that parameters are required to be consistent due to the fact that two Hall elements are adopted is avoided, meanwhile, the zero setting precision of the eddy current probe and the dynamic range of output signals of the probe are improved, and the linear measurement range becomes large; the eddy current probe adopts the Hall element as a detection element, so that the sensitivity and the resolution are improved, and the eddy current probe is more suitable for a low-frequency working range; no reference piece is needed in the detection and zero setting process, and detection of large parts and equipment and occasions needing small probe sizes are also very convenient.

Description

technical field [0001] The invention belongs to the field of eddy current detection, and in particular relates to an eddy current probe which utilizes a Hall element to realize an automatic zeroing function and a control method thereof. Background technique [0002] The eddy current sensor is a traditional non-contact measurement and sensing device, which has excellent characteristics such as non-destructive testing, high sensitivity, fast response speed and strong anti-interference ability, and is widely used in displacement measurement and defect measurement in various fields such as industrial production. detection and equipment operation status monitoring. However, limited by technical bottlenecks such as optimization of coil structure parameters, innovative design of detection circuits, and dynamic compensation of measurement errors, existing eddy current sensors generally have prominent limitations such as poor sensitivity, insufficient linearity, and poor anti-tempera...

AI Technical Summary

Problems solved by technology

[0004] However, the method of using dual-sensor differential to achieve zero adjustment has certain defects. First, it is necessary to ensure that the parameters of the two sensors are consistent, which puts forward high requirements for sensor processing; Zero probe, a reference piece is needed in the process of testing zero adjustment, which means that it is very inconvenient to detect large parts, equipment and occasions that require a small probe size

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