Quick gap electromagnetic measurement method and sensor device

Abstract

The invention discloses a quick gap electromagnetic measurement method and a sensor device. The gap electromagnetic measurement sensor device suitable for any metal or non-metal material and the measurement method of the same are designed based on an electromagnetic induction principle. The sensor device consists of two thin metal sheets, a coil detecting thin plate, a holding rod, a fastener and a lead. The measurement method comprises two steps of calibration and actual measurement. The sensor device and the measurement method adopt an unique ferromagnetic micro-spring piece, namely the sensor device and the measurement method can adapt to gap detection of any material, have the important advantages of being high in measurement speed, precise in quantification and free of leak detection, can effectively replace conventional gap size measurement methods, quickly, precisely and comprehensively measure the gap size of workpieces and are suitable for gap measurement work of various metal or non-metal tubes, plates, bent workpieces and the like, and a detecting signal dynamic range and the linearity degree are improved well.

Description

technical field [0001] The invention relates to a non-destructive testing method and a sensor device, in particular to a fast electromagnetic measurement method and sensor device for gaps applicable to any metal or non-metallic material. Background technique [0002] In industrial production, some special products have strict specifications and dimensions, and need to be precisely measured to ensure that their quality and performance meet the standards. For example, the peripheral heat conductor of a certain nuclear fuel rod is composed of multi-layer metal sleeves, the number of which is large, the gap size between the tubes is strictly required, and the range of variation is large, requiring precise measurement. The conventional gap size measurement method can only be segmented and the probe replaced. It is not convenient to carry out random inspection according to the specifications, the inspection cycle is long, and it is easy to miss inspection. In addition, various co...

AI Technical Summary

Problems solved by technology

For example, the peripheral heat conductor of a certain nuclear fuel rod is composed of multi-layer metal sleeves, the number of which is large, the gap size between the tubes is strictly required, and the range of variation is large, requiring precise measurement. The conventional gap size measurement method can only be segmented and the probe replaced. Sampling inspection of specifications, poor convenience, long inspection cycle, and prone to missed inspections

In addition, various conventional gap measurement methods have their limitations. Most of them can only measure specific detection objects, and their application range is narrow. Some components of different materials cannot even be tested.

Such as capacitance gap measurement method, the detection object must be metal material, the gap change is slightly larger, and the sensitivity drops rapidly; conventional inductance or eddy current gap measurement method, the detection object must also be metal material, due to the lift-off effect, its dynamic range is small, Linearity is not ideal

Images