SU1610426A1 - Chamber for acoustic measuring in the presence of longitudinal electric field - Google Patents

Abstract

This invention relates to a measurement technique. The aim of the invention is to improve measurement accuracy and electrical safety, expanding the range of probe frequencies and electric field strengths and simplify the design. The dependence of the parameters of the test medium filling the cavity of the housing 1 on the presence of a longitudinal electric field is determined by measuring the parameters of the acoustic signal emitted by the transducer 2 and received by the transducer 3 when the high voltage source 4 is turned on and off, creating an electric field between the electrode 7 and the working surfaces converters 2 and 3. The goal is achieved by the presence in the acoustic path of only electrode 7, whose thickness is much less than the acoustic wavelength natural oscillations set at sufficiently large distances from the grounded work surfaces converters 2 and 3. 1 yl.

Description

The invention relates to measuring technique and can be used for acoustic measurements in the presence of a longitudinal electric field.

The aim of the invention is to improve the accuracy of measurements and electrical safety, expanding the range of sounding frequencies and electric field strengths and simplifying the design.

The drawing shows a chamber for acoustic measurements in the presence of a longitudinal electric field.

The chamber for acoustic measurements in the presence of a longitudinal electric field contains a housing 1 of a dielectric material emitting. and receiving electro-acoustic transducers 2 and 3, designed to create an electric field, a high voltage source 4 with first and second terminals 5 and 6 of opposite polarity and a metal electrode 7 installed inside the housing 1, the thickness of which is much less than the wavelength of acoustic vibrations connected to the first terminal 5 source 4. Electro-acoustic transducers 2 and 3 are mounted coaxially in opposite walls of the housing 1, their working surfaces are connected to the second terminal 6 of the source 4 and are grounded. The metal electrode 7 is placed in the middle of the distance between the transducers 2 and 3 parallel to their working surfaces so that it overlaps the acoustic. pathway.

The proposed camera works as follows.

When you turn on the source 4 high voltage between the metal electrode 7 and the working surfaces of the transducers 2 and 3 creates a homogeneous longitudinal acoustic pope. The probe acoustic signal emitted by the transducer 2 'propagates through the test medium filling the cavity of the housing 1 and is received by the transducer 3. By measuring the amplitude and phase of the received signal with the source 4 turned on and off, the degree of influence of the longitudinal acoustic field on the parameters of the medium under study is determined.

Due to the presence of only a metal screen in the acoustic path, the thickness of which is chosen to be much shorter than the wavelength of acoustic vibrations, the accuracy of measurements increases, the range of probing frequencies increases, and the design of the chamber for acoustic measurements in the presence of a longitudinal electric field is simplified. Since the electric field is concentrated only in the medium under study between the metal electrode and the working surfaces of the electro-acoustic transducers., Which, in turn, are grounded, the electrical safety of the chamber increases and the range of electric field intensities expands.

Claims (1)

Claim Chamber for acoustic measurements in the presence of a longitudinal electric field, comprising a housing made of a dielectric material, radiating and receiving electroacoustic transducers, designed to create an electric field high voltage source with first and second terminals of opposite polarity and a metal electrode mounted inside the housing connected to the first high source terminal voltage, characterized in that, in order to improve measurement accuracy and electrical safety, expansion probing frequencies and electric field strengths and simplifying the design, electro-acoustic transducers are installed coaxially in opposite walls of the housing and connected to the second high-voltage source terminal, the metal electrode is placed midway between the transducers parallel to their working surfaces so that it overlaps the acoustic path, In this case, its thickness is chosen much shorter than the wavelength of acoustic oscillations, and the second terminal of the high voltage source is grounded.