Characteristics of a Digital Thickness Gauge for Measuring
There are many kinds of digital display thickness gauges on the market, which are divided into contact type and non-contact type in terms of measurement principle. In this paper, the editor of Lanpeng Measurement and Control will introduce to you the desktop digital display thickness gauge that can be applied to the thickness detection of steel plates.
Measuring principle of thickness gauge
It is composed of two upper and lower laser ranging sensors. When working, the upper and lower sensors respectively measure the distance between the sensor and the upper and lower surfaces of the measured object, and subtract the distance measured by the two sensors from the total distance between the two sensors. The thickness of the measured object can be obtained from the distance.
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The advantage of the laser thickness gauge is that it is a non-contact measurement without loss of accuracy due to wear, especially suitable for the measurement of moving objects. The distance measuring sensor of Lanpeng laser thickness gauge is installed on two brackets that can do synchronous reciprocating motion, which can realize the covering measurement of the rolling plate in the transverse direction.
Basic principle of non-contact online laser thickness gauge:
The laser thickness gauge is composed of upper and lower laser measuring heads facing each other. Its basic measurement principle is shown in the "Measurement Principle Diagram" on the right.
The laser probe 1 and the laser probe 2 are arranged at a fixed distance A. When working, the laser probe 1 emits a beam of laser light to irradiate the lower surface of the measured object, and the diffuse reflection light of the spot on the lower surface returns to the laser probe 1. On the CMOS chip, by analyzing and calculating the position of the light spot on the CMOS chip, the actual distance B1 from the laser probe 1 to the lower surface of the measured object can be obtained.
Similarly, the distance B2 from the laser probe 2 to the upper surface of the measured object can be obtained. The thickness H of the measured object can be obtained by subtracting the distances B1 and B2 from the two measuring heads to the upper and lower surfaces of the measured object from the distance A between the two measuring heads.
The advantage of the laser thickness gauge is that it is a non-contact measurement without loss of accuracy due to wear, especially suitable for multi-point measurement in motion. Moreover, compared with the ultrasonic thickness gauge, the accuracy is higher, and there is no radiation pollution compared with the X-ray thickness gauge.
