SU697800A1 - Linear displacement measuring device - Google Patents

Description

(54) DEVICE FOR MEASURING LINEAR TRANSFORMATIONS

one

The invention relates to a measurement technique and can be used in measuring displacements using a differential inductive sensor.

A device for measuring linear displacements is known, comprising a differential inductive sensor, a measurement circuit switch, a memory unit, a division unit 1.

A disadvantage of the known device is limited performance and low accuracy.

The closest in technical essence to the invention is a device for measuring linear displacements, comprising a differential inductive transducer, two measuring circuits, a subtraction unit, an adder and an arithmetic unit 12.

A disadvantage of the known device is the low productivity and structural complexity.

The aim of the invention is to increase productivity and yripomeiiHC design.

The goal is achieved by the fact that in a non-tagged device, the arithmetic unit is made as a detonation unit, the output of one measuring circuit is connected to the first input of the subtraction unit, the output of the other is connected to the first input of the adder, the second input of which is connected to the output of the subtraction unit, the second input of the unit the subtraction is connected to the output of the adder, and the outputs of the subtraction unit and the adder are connected to the input of the arithmetic unit.

The drawing shows the block diagram of the described device.

Claims (2)

The device for measuring linear displacements contains a differential inductive transducer with coils LI and 1-2. connected consequently and according to, measuring circuits 2 n 3, included in the circuits of coils LI and b, subtraction unit 4 connected to the output of measuring cell 2, adder 5, connected to the output of measuring circuit 3, outputs of subtractor 4 and adder 5 connected to the inputs of the arithmetic unit 6, made in the form of a dividing unit, the output of the subtraction unit 4 is also connected to the input of the adder 5, and the output of the adder 5 to the input of the subtraction unit 4. At the neutral position of the moving core of the converter 1, the currents flowing in the coils JLi and a. are equal. The signals measured by circuits 2 and 3 will be proportional to the value in where a is the coefficient determined by the physical properties of converter 1. As the core of converter 1 is displaced by x in the direction of coil LI, the current in coil t, t will increase by value A /, and in KaTymKeL, it will decrease by the same amount of L /. Then the signal at the output of the measuring circuit 2 will be proportional to the expression / a (xo + x), and at the output of the measuring circuit 3 - to the Byrazheniyu g. A (xo-x) - The signals Ni at the output of the subtraction unit 4 and Ni at the output of the adder 5 can be found from the system of equations N t а (хо + х) -Hi (i) Nz а (хо - х) + IS / 1. In the arithmetic unit 6 we obtain the ratio of the signals NI nh / j, T. E. A solution for determining the linear displacement X of the moving core of the transducer of expression (2) shows that the accuracy of the calculation is not affected by the parameter a, which is determined by the physical properties of the transducer and is a random variable changing under the influence of various factors temperature, aging of the structural elements of the device, etc. By introducing feedbacks from the addition output to the input of the subtraction unit and vice versa, it was possible to implement a simple algorithm for calculating linearly about moving. This led to the fact that, as an arithmetic unit, only a dividing unit is needed and no additional memory blocks, control, switching are required, which greatly simplifies the design of the device and reduces its cost. In this device, the information process is carried out in one cycle, which reduces the measurement time and improves the performance of the device. An apparatus for measuring linear displacements containing a differential inductive transducer, two measuring circuits, a subtraction unit, an adder and an arithmetic unit, characterized in that, in order to increase productivity and simplify the design, the arithmetic unit is made in the form of a division unit, the output of a single measuring circuit connected to the first input of the read block, the output of the other to the first input of the adder, the second input of which is connected to the output of the subtraction block, the second input of the subtractor block Inna with the output of the adder, and the outputs of the subtraction unit and the adder are connected to the input of the arithmetic unit. Sources of information, take BQ attention during the examination 1. USSR author's certificate No. 386233, cl. G 01 B, 1971. 2. USSR author's certificate No. 356466, cl. G 01 D 21/00, 1970 (prototype).