SU137566A1 - Goniometric table - Google Patents

Description

The proposed goniometer table intended for measurement. for example, the angular measures are of a known type of devices of the same purpose, in which two sensors are used for measuring units and their proportions, one of which, used for counting units, is an inductive gear sensor that compensates for the total error.

Increased measurement accuracy is provided by using an optical sensor in the proposed goniometer table for reading fractions of units of measurement and a linear differential inductive sensor to correct systematic errors.

FIG. 1 shows a section of the proposed goniometric table; in fig. 2-principle electrical circuit diagram of the correction of mathematical errors.

In the case / fixed two wreaths .2 and 5 with the same number of teeth. The upper rim 2 can be rotated and secured in the desired position.

Coils are located in the cavities of the crowns. In the casing, on shaft bearings there is a shaft 4 with crowns 5 and 5 fixed on it, having the same number of teeth as the crowns 2 and 3.

The crowns 5 and (5 on the shaft are positioned so that at the moment when the tops of the teeth of the crown 5 arrive at the crests of the teeth of the corresponding fixed crown 2, the tops of the teeth of the crown 6 arrive at the crests of the crown 3. At this moment the total resistance is maximal at the coil, placed in the crown 2, and minimally at the coil, placed in the crown 3. With further rotation, there is an increase in the resistance of the coil of the crown 3 and its decrease in the coil of the crown 2.

By comparing the voltage drops on each of the coils, it is possible with the help of the usual differential circuit to determine the difference in the impedances of both coils. The difference of the ETA for example. No. 1375662 of the Institute, depending on the angle of rotation of the shaft, varies in a sine wave, the number of which is zero for one revolution of the shaft is 2z, where z is the number of teeth of each rim. Thus, it is possible to divide one revolution into 2z corner pieces, with compensation for the total error due to the fact that all the teeth simultaneously participate in the formation of the magnetic circuit. In a cylindrical hole coaxial with the outer surface of the shaft, a rotary rod 7 is mounted, carrying a stage 8 and turned by a differential, micrometric screw. A lever 9 is seated on the neck of the shaft 4. It is fastened to the shaft in the required position with the help of a clamp. At the end of the lever 9 a linear scale is placed, which is observed in a JO microscope with a spiral ocular micrometer. Using a linear scale and a microscope, the angle of rotation of the lever 9 and the shaft 4 associated with it is measured within + 1 °. Whole degrees are counted by the switch device included in the measuring diagonal of the bridge circuit connected to the inductive sensor described. On the shaft 4 is fixed cam 11 acting on the measuring rod 12 of a linear differential sensor, correcting systematic errors. FIG. 2, numbers 13 and 14 denote the coils of the goniometric table, numbers 15 and 16 the coils of the linear differential inductive sensor, the measuring rod 12 of which rests on the cam 11 (Fig. 1). The cam profile // is adjusted so that changes in the inductance of the compensator during movement of the measuring rod produce the necessary displacements of the equilibrium positions of the bridge table circuit. Microscopes 17 and an autocollimation tube 18 designed for sighting on limbs are placed on the special ring bracket of the table (Fig. 1). , angular limit measures and details. If necessary, indicator fixtures are installed on the same bracket for alignment of beats, for checking the errors of the pitch of gears, and for technological work on marking and stroking the limbs.

Subject invention

A goniometer for measuring, for example, angular measures, equipped with two sensors in parallel for counting units of measure and their proportions, in which for counting units of measurement an inductive gear sensor is used to compensate for the total error, characterized in that, in order to improve measurement accuracy, for reading out the fractions of units of measurement applied optical sensor; and for the correction of systematic errors - linear differential inductive sensor.

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to well on the srig-2 indicator