SU652446A1 - Acoustic level meter - Google Patents

Description

I

This invention relates to an in-line technique, intended to control the level of a substance. in a tank by measuring the frequency of sound waves and can be used, for example, to control the level of building materials in liquid or solid phases of the state of a substance, in particular cement, concrete mix in bunkers and metering devices.

A sound level meter is known, which contains a sound oscillator consisting of a radiator and a receiver, which is connected in series with a 1x bandpass filter, a preamplifier low frequency amplifier, power amplifier, a frequency converter into voltage, and a secondary device i.

In this level gauge, during self-oscillation of self-oscillations, the oscillator starts on the first harmonic (information wave) (Unstable, that is, it starts up not on the first harmonic but on the 1st harmonic of the cut-off frequency (especially HFN)

acoustic noise), which significantly reduces the measurement accuracy.

The purpose of the invention is to improve the measurement accuracy.

For this purpose, a comparator is included in the sound level meter, which is connected between an additional IGM scanning oscillator and a 1 m auto-oscillator sound, and the comparator input is connected to a low-frequency preamplifier.

The drawing shows a block diagram of the proposed device.

A sound level gauge consists of a scanning generator 1, a comparator 2 and an autoresonant sound generator (AZG), made of an amplifier power 3, the acoustic path of the device, which includes a 4-oscillator emitter mounted on a 5-capacitance capacitor, and a 6-sound receiver oscillations, bandpass filter 7, preamplifier in low frequencies,. ;. 4., .- 4 i .V, .. 65 ,,., “I, - ..,; .., -. convert the 9 frequency to the voltage and the secondary device 10. The sound level gauge works as follows, the scatter generator 1 crashes 7GS 1c "asterot oscillations lyny chi1yena 1" (frequency range (with increasing frequency from the current to the front panel) power 3. The oscillation of the oscillations is converted by the transmitter 4 into the sonic low-frequency oscillations of the liner-frequency change, which propagate in a substance-free space of capacitance 5, -, -. In the capacitance of capacitance 5 above the substance, a reoeohyse appears, “No cobash, i.e., a wave. Audio resonance oscillations are transformed by the receiver into electric oscillations. the force of its amplifier 8. Then the signal is fed and the comparator 2, it compares the amplitude of the signal with the great trigger threshold, after reaching which the compassioner triggers, i.e. it connects the preamplifier input 8 to ode amplifier 3 and disables the scan generator 1, resulting in a closed .-, ... 1 -. . :.

Claims (1)

 - 1446 .4 autoirculation circuit; installing a steady autoresonance oscillation at the frequency of the first harmonic corresponds to a given level of matter. Transducer 9 converts these oscillations to a constant voltage and is measured by a secondary device 10, whose readings determine the level of matter in the vessel. E Formula of the Invention A sound level gauge containing a sound accelerator consisting of an interplay and an oscillation receiver. connected in series, a bandpass filter, a low frequency preamplifier and a power amplifier, a frequency converter into a voltage and a third-party gfor. the oscillator, and the input of the comparator, is connected to a low frequency preamplifier. Sources of information, taken into account in the examination of 1, Aviation Technique, special application, DOT t) works of VNIISSPSPA vol. 12, Krasnodar, 1974, p. 109.