We catch microns. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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The circuit diagram of the device (see figure) includes a measuring bridge formed by resistances R3, R4, an inductor L2 and a sensor L1. A milliammeter is included in one of its diagonals, and the secondary winding of the transformer Tr1 is included in the other. When changing the distance of the sensor from the product, the coating thickness of which needs to be determined, the sensor inductance decreases or increases. The balance of the bridge is disturbed, and a current rectified by diodes D5 and D6 flows through the measuring device.
This scheme is original in that it allows you to do without electronic amplifying devices, which increases the reliability of the device. The rectifier for powering the bridge is made on semiconductor diodes. The resistance values of the resistors depend on the thickness of the coatings to be measured.
A device for measuring the thickness of non-magnetic coatings on ferromagnetic bases allows you to determine such coatings with high accuracy in the thickness range from 0 to 100 microns.
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