SU324578A1 - DEVICE FOR DETERMINING NUMBER M - Google Patents

Description

The invention relates to the field of aircraft equipment, namely, to measuring flight parameters.

There are known devices for determining the number L1, containing a pulsed emitter of ultrasonic vibrations, two ultrasound receivers located b (metrically with respect to the signal and connected to the input of a difference unit that calculates the difference in the transit times of ultrasonic oscillations between the radiator and the corresponding first and second receivers.

In the known devices for measuring the speed of air (gas) trays using ultrasound, the time of oscillation propagation from the radiator to two symmetrically located receivers along and against the flow is measured, and the speed is determined by subtracting the value of one time interval from the other. Such a method of determining the velocity causes a methodical error due to the influence of the parameters of the medium being measured.

The aim of the invention is to eliminate the influence of the parameters of the medium being measured and to increase the measurement accuracy.

For this, the proposed device is equipped with a block.m.

the calculator of the relationship of two signals; in this case, the inputs of the summation block are connected to the ultrasound receivers, and the outputs of the difference and summation blocks are the corresponding ones; the inputs of the relationship calculator.

The drawing shows the scheme of the proposed device.

It contains a driver 1 and a high voltage 2 generators, a surge generator 3 (emitter), pipeline 4 (sensor), 5 n 6 receivers of ultrasonic oscillations, amplifiers 7 and 8, a difference block 9, triggers 10 and //, a logometer 12 (calculator ) and summator 13.

Triggers foreplay signals whose duration is equal to the time of passage of the shock wave from the arrester to the receiver-m, located at equal distances on either side of the arrester. The difference block forms an impulse whose duration is equal to the difference of these times. The adder produces a summation of the output pulses of the triggers.

The pressure of the difference between the times of passage of the shock wave from the gaps to the grids on the IMS is carried out by a calculator of ratios, for example, a logometer, on whose windings output signals from a block of difference and adder are applied.

The device works as follows. - small for unequal time intervals - time, because to one lead the shock wave propagates against the flow at a speed of C-V, and to the other - along the flow at a speed where C is the speed of propagation of ultrasonic backing; V is the flow rate. . „. LL 1 When Ti-7; -g,; T2 where t | and T2 is the time during which the shock wave propagates from the gaiter to the receiver; L is the distance from the discharge of the engine to the receiver, - .. C ± .. ,, 2. C, .., r. + .. IL ,.

TI-T2

m

: a relation

TI + T2 V -5 10 15 20 Proposal of the Invention A device for determining the number M, containing a two-pulse emitter of ultrasonic oscillations, two liri. ultrasound, located symmetrically with respect to the emitter and connected to the input of a difference unit that calculates the difference in the transit time of ultrasonic oscillations between the emitter "Correspondingly, the first and second receivers, characterized in that, for the purpose of exclusion (the parameters of the measured medium and increase the accuracy of measurement, the device is equipped with a summation unit that calculates the sum of the passage times of ultrasonic oscillations between the emitter and receiver, and the calculator of the two signals, or moves summing unit connected "priemai Cams ultrasound, and outputs the difference blocks and summing - -k corresponding inputs otnoscheniya calculator.