Method and device for synchronously filtering electromagnetic eddy current detection signal by using vibration signal

Abstract

The invention provides a method and a device for synchronously filtering an electromagnetic eddy current detection signal by using a vibration signal, which are used for synchronously filtering the detection signal in airborne oil metal abrasive particle monitoring or electromagnetic eddy current detection of other irregular jumping metal tubes, rods and wires and the like in an online vibration working state. The device comprises a detection data processing instrument (3), a detection probe shell (1) and an electromagnetic eddy current detection sensor (2) arranged in the shell (1), the electromagnetic eddy current detection sensor (2) further comprises a detection coil (21) and an acceleration coil (22) used for extracting vibration acceleration signalsl; wherein the acceleration coil (22) and the electromagnetic eddy current detection coil (21) are fixed in the longitudinal direction of the detection surface in a spaced and overlapped manner through an elastic piece (23). The invention can solve the problem that the quality of effective signals of electromagnetic eddy current detection is reduced due to irregular jumping of a detected object well; and particularly, a satisfactory effect is achieved on electromagnetic detection signal processing of airborne engine oil monitoring.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing, in particular to the monitoring of on-board oil, metal abrasive particles or other irregularly beating metal pipes, rods, wires, etc. A method and device for detecting signals by electromagnetic eddy currents. Background technique [0002] During online eddy current testing, due to the irregular jump of some testing objects, such as online non-destructive testing of pipes, metal rods and metal wires on automated production lines, as well as in-service oil and metal abrasive particles in electromechanical engine systems such as transportation vehicles and aerospace Detection, etc., the vibration of the detection object has a great influence on the quality of the detection signal. Especially for the on-line monitoring and detection of on-board oil and metal abrasive particles, the engine is generally in different working states, and some factors such as the lift-off distance brough...

AI Technical Summary

Problems solved by technology

Especially for the on-line monitoring and detection of on-board oil and metal abrasive particles, the engine is generally in different working states, and some factors such as the lift-off distance brought by the mechanical vibration to the detection sensor change, resulting in the influence on the electromagnetic eddy current detection signal. The signal-to-noise ratio of electromagnetic detection is greatly reduced, and the resolution of the detection image is also relatively reduced, even submerging the effective signal of metal abrasive particles.

like figure 1 In the normal non-interference state of the detection object in the absence of vibration, there are four effective detection signals 1, 2, 3, 4, and as figure 2 Among them, when the interference signal brought by the mechanical vibration of the engine is likely to overwhelm the effective small signal 4, the effective signal 4 cannot be distinguished and the accuracy of the detection data will be affected

[0003] Moreover, in the on-line monitoring of on-board oil metal abrasive particles, since the engine has different vibration conditions under different working conditions, the engine drives the pipeline oil and the detection sensor to mechanically vibrate together, and the frequency and amplitude of the vibration in different working conditions There are large changes in vibration and phase, and the interference signal is constantly changing with the work of the engine. There is no fixed signal filter to filter out the interference signal. A flexible and variable filtering method is urgently needed to realize the vibration signal. filter

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