SU74182A1 - Device for measuring small displacements and displacements - Google Patents

Description

The subject of the invention is a device for measuring small displacements and displacements using a differential inductive sensor, the windings of which are included in the opposite branches of the CNT bridge. moan.

The proposed device is characterized in that two primary windings of a differential transformer are used as the other two branches of the bridge. The secondary windings of the transformer are used to supply alternating voltage to double triode grids, the anode circuits of which are branches of the ijToporo alternating current bridge, the measuring diagonal of which is included.

The primitive scheme of the device is given in FIG. 1 and 2.

FIG. 1, depicts 1; it constructs an induction sensor, the following symbols are adopted; The i-part whose size is being measured, 2 is the measuring rod in contact with the part to be monitored, steel measles fixed to the spring and able to move, 4 are the cores of the induction sensor, -5-windings of the induction sensor.

If the measles 3 is in the middle between the windings 5, then their inductances are the same. Moving the core down increases the inductance of the lower winding and decreases the inductance aepxHeii. Thus, the inductances of the windings 5 are determined by the position of the core, which in turn depends on the size of the part I.

The windings 5 are the two arms of the measuring bridge (Fig. 2), which is threaded from the winding II of the power transformer 13. The other two legs of the bridge form the two half windings of the differential transformer 6.

If the inductances of the windings .5 are the same, then the currents flowing through the half-windings of the transformer 6 are also the same, the resulting ampere-turns are zero, and in the secondary winding of the transformer C) e. d. not induced. If measles 3 moves away from the middle position, then one of the inductances 5 will increase, the other will decrease, and in the secondary winding of the transformer 6 will be injected e. D. s., in-phase or anti-phase supply voltage of the bridge, depending on the direction of departure of the core 5 from the average position.

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The secondary voltage of the transformer 6 is divided into two equal parts and fed to the grid of the double triode 10. The anode circuits of the lamp are powered by alternating voltage. (The part of the circuit included between points 8 and 9 is not shown on the fig. 2). Resistance 7 in the cathode of a double triode creates the required bias.

If e. d. on the grids of the rabbi and} lyu, then along the anodic resistances of the Lenses and 12 branches of the lamp flow, the currents, the constant components of which are also equal, flow. Therefore, Papr Zhenpe at the terminals of resistance. Neither M in the diagonal of the lamp bridge is equal to zero and milliampermet; the current state of g / 5 (with zero and the middle of the scale) indicates 1. it is zero,. is, the reference dimension.

If it is measles. moves away from the middle position, then on the grids on the Wits e. D. s., in-phase anodic voltage in one of the branches of the double triode and antiphase in the other branch. As a result, one of the anode currents will disappear, and the other will decrease and the device / 5 in the lamp diagonal will indicate the deviation, in the first approximation, proportional to the deviation

cor 3 from the middle position. The sign of deviation of the instrument arrow is determined by the direction of deviation of the core from the middle position.

With a milliammeter, 2 mA (l: 1 mA), the sensitivity of the circuit can easily be reduced to 3 microns.

PRE: imeth and s found and

A device for measuring small displacements and shifts at the point of a differential induction sensor loop, the windings of which are included in the protructing branches of the yirrcTona bridge, which means that two primary windings of the differential transformer used as the two other branches of the bridge, the windings of which are used to supply intermeable inverters to the net of a double triode, the anode pennies of which are the branches of the second AC bridge,: the diagonal of which includes a measuring device.

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