Electronic non-contact micrometer. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Measuring technology
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An electronic non-contact micrometer measures the diameter of a copper wire in the range from 0,12 to 1,8 mm.
The VT1VT2C4C5L3 generator operates at a frequency of about 15 MHz and, through the coupling coil L2, feeds the measuring part, consisting of the RA1 microammeter, diodes VD1, VD2 and the L1C1C3 circuit. A positive voltage half-wave on L2 creates a current in the PA1-RP1-RP2-VD2 circuit, and a negative one - PA1-RP1-L1C1C3-VD1. With the RP2 trimmer, when adjusting, the microammeter needle is set to zero.
Coil L1 of the inductive sensor, together with C1СЗ, forms a parallel circuit tuned to work on the right slope of the resonant curve, that is, it performs the functions of a frequency discriminator. When a piece of copper wire (diamagnet) is introduced into the coil L1, the resonant frequency L1C1C3 increases (approaching the frequency of the generator VT1VT2), and the resistance of the circuit increases; a current begins to flow through the microammeter, which is practically proportional to the diameter of the measured piece of wire.
(click to enlarge)
Design: L1 is wound on a ceramic tube 20 mm long, with an inner diameter of 2 mm and an outer diameter of 4 mm - 42 turns (turn to turn) with PEL-0,21 wire. The L2L3 transformer is wound with a PEL-0,33 wire on a polystyrene frame with a diameter of 6 and a length of 15 mm - first L3 in one row of 22 turns with a tap from the middle, on top of it L2 -11 turns. The transformer of the power supply unit (the device can also be powered from the Krona battery) is made on a W-shaped magnetic circuit with a cross section of 4,2 cm2, the primary winding is 2160 turns of PEL-0,15, the secondary is 120 turns of PEL-0,38 mm. Microammeter RA1 - for a current of 100 μA.
When adjusting the C5 trimmer, the generation frequency is set to 15 MHz, C3 - the resonance of the L15C1C1 circuit is taken "to the left" from 3 MHz, with a copper wire with a diameter of 1 mm inserted into L1,8, the RP1 trimmer sets the PA1 arrow to the end mark of the scale, and RP2 - set to zero with "empty" L1. The device is calibrated with pieces of copper wire with a known diameter, while taking into account only the diameter of the copper core with the insulation removed.
Author: Georgy Kuzov; Publication: N. Bolshakov, rf.atnn.ru
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