SU1585691A1 - Apparatus for measuring vertical distribution of sound speed in liquid media - Google Patents

Abstract

The invention relates to computing. The aim of the invention is to expand the field of application by allowing measurements in moving liquid media. The acoustic signal is radiated by receiver 2, acoustic signals reflected from the boundaries of inhomogeneous layers of the liquid medium are received by receiver 2 and acoustic receivers 2 and 3. The signal received by receiver 1 has a Doppler frequency shift due to fluid movement, the amount of this shift from frequency meter 13 goes through the unit 18 memory in the computing unit 19, where the measurement results of the measurement of the vertical distribution of the speed of sound in the liquid medium, obtained by processing the signals received, are corrected kusticheskimi receivers 2 and 3 are mounted at a fixed distance from priemoizluchatel 1. 1-yl.

Description

where v,

-01

f

the constant velocity of the fluid according to the system included in the correction unit 23;

the speed of sound according to sensor 19 The signal from the receiver 2 post-falls through the amplifier-limiter 14 to the input line 16 of the delay, and the signal from the receiver 3 through the amplifier-limiter 15 enters the input of electronic logic circuits And 17. The signal at each of the outputs of the delay line 16 are delayed relative to the input signal by about; (N. -1) / f where N-, is the number of bits of the delay line 16 from the input to the corresponding output; f is the frequency of clock pulses arriving at its second input, f-j; mF inkcoi; m, k - integers. The time delays of the signal on the outputs of line 16 are equal to delays - (N- ,, - D / mkcg;. These delays correspond to the angles of inclination of the characteristics of the system of acoustic receivers 2 and 3, expressed by the dependence

(. -7ll-Coi

-It,

inkl (23

where 123 ch + Vc ().

Estimated base 1; between adjacent corners c / o; and Ro; automatically calculated by the computing unit. at fixed distances between the emitter and the receiving center

WITH;

2 (H | - H-)

- but

 1H

25

Where

(time of propagation of the sound emitted and received by the receiving radiator to the corresponding horizon.

Thus, the device takes into account the change in the calculated base distance due to the movement of the liquid medium from the moment of radiation to the moment of reception of the reflected signal. The invention allows to increase

 5 the efficiency of remote recording of acoustic inhomogeneities in the ocean due to measurements taken while the ship is moving.

40. Ph

about rmu l and

acquisitions

45

0

A device for measuring the vertical distribution of the velocity of sound in fluids, containing the first and second acoustic receivers installed at a fixed distance from each other, the first and second amplifiers-limiters, a delay line with taps connected. OANIM. from its inputs through the first amplifier-limiter to the first acoustic receiver, logic circuits AND, connected by the first inputs to the outputs of the delay line, the second inputs 5.Dami through the second amplifier-limiter - to the second acoustic receiver, electronic switches, connected the first information inputs to the outputs of logic circuits H, the generator

support pulses connected to the control inputs of electronic keys, a memory unit and a computing unit connected through a memory unit to the outputs of electronic keys, a frequency sound velocity sensor connected in series, fixed at a fixed distance from one of the acoustic receivers, a frequency multiplier and a clock pulse generator connected to the second input of the delay line, characterized in that, in order to expand the field of application by allowing measurements in moving liquids media, it is provided with series-connected switches, the received signal amplifier, mixer, filter elem third usilitelem- limit, a frequency counter connected to the input of the memory priemo- emitter that is connected to the first

the switch input, a series-connected pulse modulator and a power amplifier, connected to the second switch input, a synchronization-detector, whose input is connected to the output of the reference pulse generator j and the first output is connected to the power amplifier, the second

the output to the mixer, the third output to the second information inputs of the electronic switches, the fourth output to the generator of the reference pulses, the control unit, the first input of which is connected to the synchronizer-detector,

the second input is to the computational block. ku, and the output - to the input of the synchronizer-detector, and the correction unit, the output of which is connected to the input of the block

the memory, the input is to the second output of the computing unit, and the output of the sound speed sensor is connected to the input of the memory unit. .

Claims (1)

•Claim A device for measuring the vertical distribution of the speed of sound in liquid media, containing the first and second acoustic receivers installed at a fixed distance from each other, the first and second limiter amplifiers, a delay line with taps connected. One from its inputs through the first, 'amplifier - limiter to the first acoustic receiver, logical circuits ^; we And, connected by the first inputs to the outputs of the delay line, the second inputs through the second amplifier-limiter - to the second acoustic receiver, electronic keys connected. the first information inputs to the outputs of the logic circuits And, generator i 1585691 'reference pulses connected to the control inputs of electronic keys, a memory unit and a computing unit connected via a memory unit to the outputs of electronic keys, serially connected frequency sound velocity sensor mounted at a fixed distance from one of the acoustic receivers, frequency jq multiplier and clock generator pulses connected to the second input of the delay line, characterized in that, in order to expand the scope by providing 15 possible measurements in moving In wild environments, it is equipped with series-connected switches, an amplifier of received signals, a mixer, a filter, a third amplifier-20 limiter, a frequency meter connected to the input of the memory unit, a receiver-emitter connected to the first input of the switch, series-connected pulse modulator and power amplifier connected to the second input of the switch, the detector-synchronizer, the input of which is connected to the output of the reference pulse generator, and the first output is connected to the power amplifier, the second output is to the mixer, the third output to the second information inputs of electronic keys, the fourth output to the reference pulse generator, a control unit, the first input of which is connected to the synchronizer-detector, the second input to the computing unit. ku, and the output - to the input of the synchronizer-detector, and the correction unit, the output of which is connected to the input of the memory unit, the input - to the second output of the computing unit, and the output of the sound speed sensor is connected to the input of the memory unit. · ·