SU441515A1 - Capacitive modulator - Google Patents

Description

This invention relates to a measurement technique using the conversion of small direct currents and voltages to a variable value. A known capacitive modulator containing a variable capacitor, between the electrodes of which a dielectric is placed, the dielectric constant of which depends on pressure, is not sensitive enough to alternating pressure. The aim of the invention is to increase the sensitivity of the modulator. To achieve this, it is equipped with a device for creating alternating pressure and an acoustic emitter (vibrator). In FIG. I depicts the design of the proposed modulator} in FIG. - one of the options for switching a modulator to convert a constant voltage into an alternating voltage. The dielectric used is dielectric; The quality of which can be passed depends on the alternating pressure. The capacitive modulator shown in FIG. I, consists of a plastin I capacitor, a liquid dielectric 2, a hermetic body 3, a device for creating alternating pressure (elastic diaphragm) 4, an acoustic radiator (vibrator) 5, a resonator 6, and a capacitor terminals 7. In FIG. 2, the following symbols are adopted: 8 — capacitive modulator, 9 — load resistor. The device works as follows .; Under the influence of an acoustic radiator (vibrator) 5 or in the event of elastic mechanical oscillations of the medium in the resonator 6 through an elastic diaphragm, the alternating pressure acts on the capacitor dielectric.

periodically changing dielectric constant of the dielectric; and thereby the capacitance of the capacitor.

As a dielectric, materials such as glycerin, unpolymerized epoxy resin, benzene, toluene, acetone, diethyl ether, etc. can be used.

The capacitor cavity is connected through an elastic diaphragm to a vibrator through an acoustic resonator. A resonator is introduced to separate the vibrator and eliminate electrical pickups on

modulator plates.

SUBJECT OF INVENTION

A capacitive modulator containing a variable capacitor, between the electrodes of which a dielectric is placed, the dielectric constant of which depends on pressure, characterized in that it is equipped with a device for creating alternating pressure and an acoustic emitter / vibrate to increase sensitivity. torus /.

FIG. 2

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