SU522469A1 - Acoustic Anemometer - Google Patents

Description

The invention relates to instrumentation and can be used to study the physics of the atmosphere and to measure the flow rate of various gases.

There is a known acoustic anemometer containing a piezoceramic transducer and an electronic circuit.

The disadvantage of the known anemometer is the large number of receivers and emitters in it and the large value of the instrument base, which adds additional disturbances to the flow under study, reduces the value of I maximum frequency of vertical pulsations of the speed of the flows under study, and also determines a large temperature error.

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

The goal is achieved by the fact that the output of the reference frequency generator (f) is connected via a faltre tube. (Fg) to the first piezoelectric transducer and the first frequency divider with a division factor l uspElter C, f 1 | n if) filter plug (f 2 ) -with the second piezoelectric transducer, the outputs of the first piezoelectric transducer are connected through filter plug 1. i

the amplifier (f} to: the first input {at the zones of the credential scheme, and the second LieokerahffiHecKoro converter through the filter plug (f), the amplifier (f |) j to the second de-type (p) to the BTOpOKiy output of the phase-measuring circuit. The initiators are implemented with two proper resonant frequencies, the converter working as an oscillator at the first one, acting as a receiver at the second one, working as an rf receiver at the first natural resonant frequency, and as the emitter at the second one.

The drawing shows a block diagram of the proposed device.

Acoustic anemometer contains; -lt piezoceramic transducers w 1 and 2, for example, from lead zirconate titanate PZT-19, filter test 3 and 4 for the resonant frequency of the piezoceram cell: transducers, filter plug 5 to 6 for the second resonant frequency Piezokeracciuix convertible audio amplifiers .7 8j rzzonans.1e amplifiers 9 and 10, Fortlirovato 1 & 11, clock frequency dividers 12, reference frequency generator 13, reference signal amplifier 14, phase-measuring circuit 15.

The device works as follows. The signal from the generator 13 frequency f

acts on the first transducer: filter 1 through filter plug 3, which is configured to

second reference frequency. The second reference frequency f d is obtained by dividing the frequency f, by three using frequency divider 12. The output of the subdigit is connected through the resonant amplifier 14 with a tuning frequency of -5 and the filter plug with frequency I connected to the second piezoceramic converter 2. The signal with frequency f, captured by transducer 2, through fclt-plug 4, with frequency f, enters the preamplifier 8 input. After a representative amplifier, the signal is amplified by two cascades of resonant amplifiers per f. enters frequency divider 12 with division factor P. 3. The conversion for frequency f is constructed similarly, but there is no divider 12. Channel outputs are connected to phase metering circuit 15, which intends to phase shift} 1 channel output signals proportional to nz; .; a given value.

Claims (1)

Invention Formula Acoustic general instrument with piezoceragamic transducers, oscillator, frequency dividers, amplifiers, plug filter and phase metering circuit, which, in order to improve accuracy, the output of the generator is connected through the plug filter to the first piezoceramic transducer and the first divider, amplifier, filter plug - with the second converter, the outputs of the first converter are connected through the filter plug, the amplifier to the first input of the phase-measuring circuit, and the second through the filter plug, the amplifier, the second section The teller with the same division factor as the first - to the second input. 12 l Bimod IS W P