PL155539B1 - Acoustic microscope focusing system - Google Patents

Abstract

focusing area of acoustic microscope with an acoustic wave transducer stuck to the propagator these waves plus the sound insulator and electrics function, characterized in that the propage element the acoustic wave comprises two half cylinders any solid (5.4) separated iso electric and acoustic light in the form of plastic plate (3), and to one half cylinder (5) the transducer is stuck broadcasting waves (1), and to the second half-cylinder (4) receiving transducer (2).

Description

REPUBLIC

POLAND

@ PATENT DESCRIPTION® PL @ 155539 © Bl

Application number: 267330

Patent Office of the Republic of Poland (22)

Date of notification: August 14, 1987

IntCl ⁵ :

G10K 11/30

G01S 15/00

The focusing system of an acoustic microscope

The holder of the patent: Warsaw University of Technology, Warsaw, PL <^ 7 Application announced: February 20, 1989 BUP 04/89 Inventors: The grant of the patent was announced on: December 31, 1991, WUP 12/91 Jerzy K. Zieniuk, Warsaw, PL Antoni Latuszek, Warsaw, PL Zygmunt Zawisławski, Warsaw, PL

55539 Bl

5) The focusing system of an acoustic microscope containing an acoustic wave transducer glued to the element propagating these waves and an acoustic and electric insulator, characterized in that the acoustic wave propagating element comprises two half-cylinders of any solid (5,4) separated by an electric and acoustic insulator in the form a plastic plate (3), the wave transmitting transducer (1) is glued to one half-cylinder (5), and the receiving transducer (2) to the other half-cylinder (4).

CL

Acoustic microscope focusing system

Claims (2)

Patent claim The focusing system of an acoustic microscope containing an acoustic wave transducer glued to the element propagating these waves and an acoustic and electric insulator, characterized in that the acoustic wave propagating element comprises two half-cylinders of any solid body (5, 4) separated by an electric and acoustic insulator in the form of a plastic plate (3), the wave transmitting transducer (1) is glued to one half-cylinder (5), and the receiving transducer (2) to the other half-cylinder (4). The subject of the invention is the focusing system of an acoustic microscope. Acoustic microscopes contain a wave transducer that generates acoustic plane longitudinal waves, which are sent towards the examined object through the element propagating these waves. The element propagating from the side of the examined object has a spherical cavity concentrating the waves. The focal point of the focusing system, which constitutes the transducer and the propagation element, may be in a liquid or gaseous medium. Systems of this type known so far work only as impulse systems in the reflection method, the so-called the "echo" method. Such a system does not allow to emit an acoustic wave continuously. The transducer used works in a transmitting and receiving system, therefore, when transmitting a signal, the highly sensitive electronic receiver cooperating with the transmitting and receiving transducer must be turned off, e.g. with a special device, the pin-diode. These additional devices are very costly and limit the measurement capabilities of the device to some extent. In the solution according to the invention, the system for concentrating acoustic waves is composed of two half-cylinders of any solid body separated by an electric and acoustic insulator in the form of a plastic plate, where a wave transmitting transducer is glued to one half-cylinder, and a receiving transducer to the other half-cylinder. The advantage of such a system is that the electric and acoustic signal coming from the transmitting transducer does not interfere with the operation of the receiving transducer thanks to electrical and acoustic insulation. This solution of the system allows not only to work with the use of short-term pulses, but above all, it enables to work with the use of a continuous acoustic signal. This allows to obtain measurements not only when changing the acoustic amplitude of the wave, but also when changing its phase. Thanks to this, additional information is obtained in the test medium and independently on the value of the specific density of this medium. In the case of operation of the system with the use of a continuous signal, the sensitivity of such a measuring system is significantly increased because the amount of energy emitted is greater than in the case of operation with the use of a pulse signal. The invention will be illustrated in more detail in the drawing, in which Fig. 1 shows the focusing system of an acoustic microscope in a side view, and Fig. 2 - same layout in top view. The focusing system has a wave propagating element including two half-cylinders 5 and 4. One half-cylinder 5 is connected to a transmitting transducer 1, and to the other 4 a receiving transducer 2. An acoustic wave is sent from the transmitting transducer 1 in a pulsed or continuous manner. This wave propagates in the half-cylinder from any solid 5 and striking the spherical boundary of the half-cylinder 5 and the liquid 6, becomes concentrated in the focus. After placing the tested object 7 in this focus, the focused acoustic wave will be dispersed in all directions. Some of the scattered waves will reach the spherical boundary of the propagating element and the liquid 6. After refraction at the medium boundary of the element 4 and the liquid 6, it will continue to propagate towards the receiving transducer 2. After reaching the transducer 2, it will be further transformed into an electrical signal, will be used to create an image of the body surface of the subject 7. The insulation 3 between the transmitting part 5 of the focusing circuit and the receiving part 4 is made in the form of a plastic plate.