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Ultrasonic Thickness Gauge Host Components
Mar 14, 2018

The ultrasonic thickness gauge mainly consists of a host and a probe. The host circuit includes three parts: a transmitting circuit, a receiving circuit, and a counting display circuit. The high-voltage shock wave generated by the transmitting circuit excites the probe to generate an ultrasonic emission pulse wave. The pulse wave passes through the dielectric interface reflection. After being received by the receiving circuit and processed by the single-chip computer, the liquid crystal display shows the thickness value, which is mainly based on the propagation speed of the sound wave in the sample multiplied by half the time passed through the sample to obtain the thickness of the sample.

Ultrasonic Thickness Gauge Components

Ultrasonic Thickness Gauge Keyboard

Ultrasonic Thickness Gauge is based on the principle of ultrasonic pulse reflection thickness measurement, when the ultrasonic pulse emitted by the probe through the measured object reaches the material interface, the pulse is reflected back to the probe, by accurately measuring the propagation time of the ultrasonic wave in the material to determine The thickness of the material being tested.

Any material that allows ultrasound to propagate inside it at a constant speed can be measured using this principle. Due to the convenience of ultrasonic processing and good directionality, ultrasonic technology measures the thickness of metal and non-destructive testing resources network non-metallic materials, which is fast and accurate, no pollution, especially in the case where only one side can be touched, it can be better. Show its superiority, widely used in all kinds of plates, pipe wall thickness, boiler container wall thickness and its local corrosion, rust, so the metallurgy, shipbuilding, machinery, chemicals, electricity, atomic energy and other industrial sector product inspection, It plays a major role in the safe operation of equipment and modern management. Ultrasonic waves are rapidly attenuated when they encounter air. To remove the air between the ultrasonic probe and the workpiece, ultrasonic couplant is used to remove the ultrasonic waves.

Usually, the smooth surface of the workpiece is measured in the factory using general oil or other non-corrosive liquids. The relatively rough surface can be made of relatively thick butter. After the measurement is completed, the probe surface and the surface of the standard block surface must be wiped off. When measuring at the same point repeatedly, each time the probe is separated by more than 10cm, and then measured at intervals of several seconds, to prevent the measured material from affecting the next measurement result due to magnetization of the probe.

Ultrasonic Thickness Gauge Measurement Picture

When using an ultrasonic thickness gauge, the plane is zero-adjusted to the plane, the convex surface is zero-adjusted to the convex surface, and the concave surface is zero-adjusted to measure the concave surface to avoid measurement errors due to different structures; use the measured material as the zero-adjusting substrate to avoid the introduction of different materials. Magneticity is different, and measurement error occurs; try to zero the same part of the tested material and then measure the same part. For example, in the workpiece edge and the middle part should be zero respectively; the surface for zero adjustment should be as smooth as possible; the roughness of the surface of the tested material has a great influence on the measured value; if the surface is not smooth, the average value should be taken as appropriate; At the time, the probe should be kept perpendicular to the material surface to be measured, otherwise it will produce a large error.

The ultrasonic probe is in contact with the surface of the measured object. The main controller controls the transmitting circuit so that the ultrasonic wave emitted from the probe reaches the bottom surface of the measured object and is reflected back. The pulse signal is received by the probe and amplified by the amplifier and added to the oscilloscope vertical deflection plate. The tag generator outputs the time stamp pulse signal and is applied to the vertical deflection plate at the same time. The scanning voltage is applied to the horizontal deflection plate. Therefore, the time interval t between the transmitting and receiving ultrasonic waves can be directly read on the oscilloscope. The thickness h of the measured object is: h=ct/2, where c is the propagation speed of the ultrasonic wave.

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