SU1506410A1 - Method of controlling directivity pattern of multicomponent acoustic antenna - Google Patents

Abstract

The invention relates to antenna technology. The purpose of the invention is to simplify the process of charting control. The essence of this control method is explained by a device comprising a generator 1, a key 2, a point source 3 of an acoustic signal, multi-element acoustic antennas 4 and 7, a processing unit 5, a generator 6 of a reference signal, an amplifier 8 and a monitor 9. To focus the antenna 7 into a specific the point of space source 3 emits an ultrasonic signal. Antenna 4 registers the real part of this signal, which is amplified in processing unit 5 and multiplied with the signal of generator 6. The resulting signal is re-emitted by antenna elements 7. Two object frequencies and difference frequencies appear in the object space, the last of which is focused at a given point. The scan of the main lobe of the antenna 7 is performed by moving the source 3 in front of the antenna 4. The distance to the focal point of the antenna 7 is varied by varying the frequency of the generator signal 6. In receive mode, the reflected signal is received by antenna 7, amplified, multiplied with the signal of generator 6 and reemitted by antenna 4. The total pulse is recorded by the source 3 and through the key 2 is fed to the amplifier 8. Then the amplified signal modulates the brightness of the beam of the monitor 9, the sweep of which is carried out synchronously with the scanning point 3. 3. Il.

Description

(21) 4125590 / 24-09

(22) 09/29/86

(46) 07.09,89. Bul Number 33

(71) Moscow Institute of Radio Engineering, Electronics and Automation

(72) H, N. Evtikhiev, V.I. Pronyushkin, and Yu.V. PishnovJ

(53) 621.396.677 (088.8)

(56) Makovsky A. Application of the transducer grating in ultrasound imaging systems. - TSHZR, 1970, № 4. p. 51.

(54) METHOD OF CONTROL OF DIAGRAM OF THE YUY DIRECTION OF MOHOELE W: HTTH AYU STATIC ANTENNA

(57) The invention relates to antenna technology. The purpose of the invention is to simplify the process of controlling the pattern orientation. The essence of this control method is explained by a device comprising an oscillator 1, a key 2, a point source 3 of an acoustic signal, a multi-element acoustic antenna 4 and 7, a processing unit 5, a generator 6 of a reference signal, an amplifier 8 and a monitor, 9. To focus the antenna 7 at a certain point

space source 3 emits an ultrasonic signal. Antenna 4 registers the real part of this signal, which is amplified in processing unit 5 and multiplied with the signal of generator 6. The resulting signal is re-emitted by antenna elements 7. In the object space, two waves of sum and difference frequencies appear, the last of which is focused at a given point. The scan of the main lobe of the antenna 7 is performed by moving the source 3 in front of the antenna 4. The distance to the focal point of the antenna 7 is varied by varying the frequency of the generator signal 6. In receive mode, the reflected signal is received by antenna 7, amplified, multiplied with the signal of generator 6 and reemitted by antenna 4. The total pulse is recorded by the source 3 and through the key 2 is fed to the amplifier 8. Then the amplified signal modulates the brightness, the monitor 9, the sweep of which is carried out synchronously with scanning echnogo source 3. 1-yl.

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The invention relates to methods for controlling the antenna radiation pattern of the antennas used to obtain the image of objects found in optically non-transparent media and can be used in defectoscopy, non-destructive testing, medical diagnostics, as well as in an ultrasound location.

The purpose of the invention is to simplify the process of managing the NAM.

The drawing shows a block diagram of a device that implements the method of controlling the radiation pattern of a multi-element acoustic antenna.

The device comprises a generator 1, a key 2, a point source 3 of an acoustic signal, an additional multi-element acoustic antenna 4, a processing unit 5, a reference signal generator 6, a main multi-element acoustic antenna 7, an amplifier 8 and a monitor 9.

A device that implements the method of controlling the NAM of a multi-element acoustic antenna works as follows.

To focus the main multi-element acoustic antenna 7 at a certain point in space, the point source 3 of acoustic synthesis emits an ultrasonic signal of the form (s / 1: + Kg), the real part of which is recorded by an additional multi-element acoustic antenna 4 and enters processing unit 5, where it is amplified and multiplied with gar; 6 signal reference signal generator

frequency f 7 f d Result

the signal is re-emitted by the elements of the main multi-element acoustic antenna 7. In the object space, two waves of sum and difference frequencies arise, the last of which is focused at a given point. The scanning of the main lobe of the main multi-element acoustic antenna 7 is carried out by moving the point source 3 of the acoustic signal before the additional multi-element acoustic antenna 4. The distance to the focus point of the main multi-element acoustic antenna 7 ,.

f-fo equal to Z ---- o

by varying the frequency of the signal f

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In the receive mode, the reflected signal is received by the main Nffloro3neMeHTHoft acoustic antenna 7, after amplification in processing block 5, multiplied with the signal of the reference signal generator 6 and reradiated by an additional multi-element acoustic antenna 4. The total pulse is recorded by a point source 3 of the acoustic signal and through switch 2 of the operating mode (receive -transfer) is fed to the input of the amplifier 8. The amplified signal modulates the brightness of the beam of the monitor 9, the sweep of which is carried out synchronously with the scanning TOf e4Horo source 3 acoustic signals.

Claims (1)

20 claims The method of controlling the beam directivity of a multi-element acoustic antenna, which consists in scanning the beam directivity by beam by forming phase delays of signals on the elements of the main multi-element acoustic antenna and focusing the beam at different distances, so that In order to simplify the control process, the formation of the phase delays of the signals is carried out by multiplying the reference signal with five 0 the frequency fp from the signals of the corresponding element of the introduced additional multi-element acoustic antenna, similar to the main one, in front of which the input point source of the acoustic signal with a frequency f is mounted, and the beam is focused on the distance Z by changing the frequency f of the signal according to the ratio f fc -5 - ..,   -18 de z -18 the distance from the point-of-source of the acoustic signal to the additional multi-element acoustic antenna; the speed of propagation of the signal of the main multi-element acoustic antenna; the speed of propagation of the acoustic signal in the field 5 1506410 de between point-m is the ratio of the sizes of the main and additional multi-element and additional multi-element acoustic an-element acoustic antenna; .tenn.