Adjustable automatic wave amplitude gain compensation method and circuit for ultrasonic thickness gauge

Abstract

The invention provides an adjustable amplitude automatic gain compensation method for ultrasonic thickness gauges, comprising: a, reflecting ultrasonic wave strength and setting a constant gain to obtain a reference gain voltage; b, for different materials to be measured, setting a slope of amplitude compensation, generating a slope gain compensation voltage by the given slope automatic compensation in a controlled time through an adjustable integral circuit; c, laminating the slope gain compensation voltage and the reference gain voltage to generate a gain control voltage. The invention further provides an adjustable amplitude automatic gain compensation circuit. Compared with an amplitude compensation curved line and a deep gain compensation method applied in the ultrasonic inspection, the adjustable amplitude automatic gain compensation method has high automatic degree and high response speed, and is closely related to the field test condition, thereby overcoming the problems of the prior compensation methods such as low automatic degree, low response speed and inconsistence to the field test. The adjustable amplitude automatic gain compensation method utilizes the theory of the integral circuit to generate a gain voltage curved line to design an ultrasonic thickness test amplitude automatic compensation circuit, and therefore, compared with other time and distance compensation methods, the method has the advantages of simple design, low cost and reliable application.

Description

technical field [0001] The invention relates to ultrasonic measurement technology, in particular to an adjustable amplitude automatic gain compensation method and circuit for an ultrasonic thickness gauge. Background technique [0002] Ultrasonic pulse reflection measurement is based on the principle of ultrasonic pulse reflection. When the ultrasonic pulse emitted by the ultrasonic probe passes through the measured object and reaches the interface between two different materials, the pulse is reflected back to the probe, and the thickness of the measured material and other related indicators can be determined by accurately measuring the propagation time of the ultrasonic wave in the material. This method It is widely used in ultrasonic thickness gauges, ultrasonic flaw detectors and other related ultrasonic measurement products. [0003] Referring to the schematic diagram of the principle of ultrasonic pulse reflection measurement shown in Figure 1, in which instructions a...

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Problems solved by technology

[0011] The purpose of the present invention is to provide an adjustable amplitude automatic gain compensation method, which can improve the poor automaticity, slow response speed and inconsistency with the field test in the existing compensation method.

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