Ultrasound thickness measuring method and device based on broadband frequency-modulation and receiving compensation

Abstract

The invention discloses an ultrasound thickness measuring method and a device based on broadband frequency-modulation and receiving compensation. Thee method structures an intermittent type broadband linear frequency-modulation ultrasound signal by using the method of linear frequency-modulation; broadcasting time of the intermittent type broadband linear frequency-modulation ultrasound signal at the inner part of a workpiece is inverted according to frequency parameters of emitted and received frequency-modulation signals; workpiece thickness is obtained by combining a preset sound speed. The device comprises a handhold type control, a display and an array type ultrasound wave probe component, wherein the array type ultrasound wave probe component is composed of a plurality of ultrasound transducers capable of stimulating the broadband linear frequency-modulation ultrasound wave, wherein one ultrasound transducer is arranged in the middle, and the rest ultrasound transducers are arranged at four sides. The ultrasound thickness measuring method and the device can realize the flaw detection at a near field and a remote field; and the invention is low in energy loss, small in volume, high in precision and strong in antijamming capability; and furthermore, the ultrasound thickness measuring method and the device can adapt various noise environments.

Description

technical field [0001] The invention relates to ultrasonic thickness measurement technology, in particular to an ultrasonic thickness measurement method and device based on broadband frequency modulation and receiving compensation. Background technique [0002] Since the first introduction of the ultrasonic thickness gauge by the American GM company in the 1940s, it has been widely used in aerospace, military industry, petroleum, chemical industry, shipbuilding, transportation and other fields. Ultrasonic thickness gauges are widely used in the measurement of various wall thicknesses due to their high measurement accuracy, easy portability, and no damage to the surface of the object being measured. Especially in the aerospace field, it is used to measure the thickness of the cladding layer of rocket engines and various high-speed aircraft heads, to measure the wall thickness of shells in the production line of military products, to measure high-pressure oil and gas pipelines...

AI Technical Summary

Problems solved by technology

[0010] (2) It is sensitive to noise and has certain requirements for the measurement environment

Because the pulse reflection thickness gauge is based on the sound pressure (ie amplitude) characteristics, it is easily disturbed by noise in an environment with a low signal-to-noise ratio, resulting in false detection or missed detection of the echo pulse signal

[0011] (3) There are certain requirements for the workpiece to be detected, and the adaptability is not strong

If the radius of curvature of the workpiece is too small, the detection surface is not parallel to the reflective bottom surface, the material structure is uneven, or the grain size is too large, the measured value will deviate from the normal value, resulting in false detection

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