Correct operation of the use of ultrasonic thickness gauge method and extend the life of
1 Working principle
Ultrasonic thickness gauge is mainly composed of two parts: the host and the probe. The host circuit includes transmitter circuit, receiver circuit, counting display circuit three parts, the transmitter circuit generated by the high-voltage shock wave to stimulate the probe, generating ultrasonic emission pulse wave, pulse wave reflected by the media interface is received by the receiver circuit, through the microcontroller counting process, through the LCD display thickness value, which is mainly based on the propagation speed of the acoustic wave in the specimen multiplied by the specimen by the time half of the specimen and the thickness of the specimen. Specimen thickness.
Ultra Chi wave thickness gauge, in the use of advanced technology at home and abroad on the basis of the use of single-chip computer technology developed a low-power, low-limit pocket-sized intelligent measuring instruments, not only the measurement of the thickness of different materials, and a single measurement of steel, ultra-thin type, at the same time can be matched with high-temperature thickness probe.
2 thickness gauge Application areas
As ultrasonic processing is convenient, and has a good pointing, ultrasonic technology to measure the thickness of metal, non-metallic materials, both fast and accurate, no pollution, especially in the permission of only one side can be pressed and touched the occasion, can show its superiority, widely used in a variety of plates, tubes, boiler vessel wall thickness and its local corrosion, corrosion, and so on metallurgy, shipbuilding, machinery, chemical industry, electric power, atomic energy and so on. Product inspection of various industrial sectors, equipment ** operation and modern management plays a major role.
Ultrasonic cleaning and ultrasonic thickness gauge is only part of the application of ultrasonic technology, there are many areas can be applied to ultrasonic technology. For example, ultrasonic atomisation, ultrasonic welding, ultrasonic drilling, ultrasonic grinding, ultrasonic polishing, ultrasonic motor and so on. Ultrasonic technology will be more and more widely used in various industries.
Eddy current coating thickness gauge working principle
1. Basic principle
The basic working principle of eddy current coating thickness gauge is, when the probe and the measured sample contact, the probe device generated by the high-frequency electromagnetic field, so that the metal conductor placed under the probe to produce eddy current, its amplitude and phase is the conductor and the probe between the thickness of the non-conductive cover layer function. That is, the alternating electromagnetic field generated by the eddy current will change the probe parameters, and the size of the probe parameter variables, and will be converted to this electrical signal processing, you can get the thickness of the coating layer to be measured.
2. Reasons affecting the measurement accuracy
(1) eddy current thickness gauge on the sample determination of the existence of edge effects, that is, close to the edge of the sample or inside the corner of the measurement is unreliable.
(2) The curvature of the specimen has an effect on the measurement, which increases significantly with decreasing radius of curvature.
(3) The surface roughness of the base metal and the cover layer affects the accuracy of the measurement, and the effect increases as the roughness increases.
(4) When the thickness of the cover layer is greater than 25μm, the error is approximately proportional to the thickness of the cover layer.
(5) The eddy current thickness gauge is sensitive to the adherent material that prevents the probe from making close contact with the surface of the cover layer. Therefore, before the measurement should be the probe and the surface of the cover layer of dirt; measurement should make the probe and the test surface to maintain a constant pressure vertical contact.
(6) The conductivity of the base metal has an effect on the measurement, which is related to the composition of the base metal material and heat treatment method.
(7) any kind of thickness gauge requires a critical thickness of the base metal, only greater than this thickness, the measurement will not be affected by the thickness of the base metal.
