SU885897A2 - Device for measuring speed - Google Patents

Description

one

The invention relates to instrumentation, technology, in particular, to measuring the speed of movement of objects.

According to the main author. St. W 626420 discloses a device comprising a displacement sensor of a test object, an acceleration sensor, an adder, a clock generator and two integrators. Ingresters are connected in series between the acceleration sensor and the adder. A sum from the displacement transducer is applied to the summing output of the adder, and a signal from the output of the second integrator is fed to the subtraction input of the adder, the output of which is a signal proportional to the speed 11.

If the acceleration sensor contains a systematic error, the speed signal at the output of the specified device will also contain an error proportional to the error of this sensor and the period of the clock generator, which is a drawback of the device.

The purpose of the invention is to improve the accuracy of the device by eliminating the influence of the systematic error of the acceleration sensor.

This goal is achieved by adding an additional adder to the device and its corresponding connection.

5 The drawing shows a block diagram of the device.

The device consists of a displacement sensor 1, an additional adder 2, an acceleration sensor 3, a first integrator 4, a second integrator 5, an adder 6, and a clock generator 7.

The device works as follows.

15 In the adder 2, the signals from the displacement sensor 1, from the first integrator 4, from the second integrator 5 to the subtraction input are brought down. At the beginning of the next clock cycle, the contents of adder 2 are entered into adder 6, into which the signal of movement from sensor 1, the signal from integrator 5 to input of subtracting is recorded at the end of clock cycle. At the end of the clock cycle, from the output of summer 6, a signal proportional to the speed is output, the adder 6 is zeroed, the contents of adder 2 is entered into the adder 6, and so on. . From the output of the integrator 4 to the adder 2, a signal is supplied that is determined by

fc (ti)

Tj, .xdt, which has an error equal to dx; T (T is the period of the clock generator, dx is the systematic error of the acceleration sensor).

To the other input of the adder 2 from the output of the second integrator 5 is fed the result of double integration, containing the error /

11i

2. ReichT. Signal applied

from the same output of the integrator 5 to the input of the summator b, contains the same

error 1 ..o

y -, which in sum should give zero (, + Te i i LxT - DxT 0)

Thus, in the proposed device, the systematic error of the acceleration sensor is compensated, thereby improving the accuracy of the device for measuring speed.

Claims (1)

1. USSR author's certificate No. 626420, cl. G 01 P 7/00, 1968 (prototype).