SU892493A1 - Dynamic capacitor - Google Patents

Description

(54) DYNAMIC CAPACITOR

The invention relates to electrical measuring technique and can be used as a parametric modulator in highly sensitive electrometric amplifiers.

A known electrostatic dynamic capacitor containing an elastic electrode and two concave rigidly fixed electrodes located near the elastic electrode. One hard electrode serves to supply an input DC voltage converted to an alternating one, the other to excite resonant mechanical oscillations of the elastic electrode under the action of electrostatic forces generated alternating voltage applied between elastic and rigid electrodes. The resonant oscillation frequency of the elastic electrode is the conversion frequency of the capacitor included in the measurement circuit; Between the electrodes is a thin plate of brittle materials

The drawbacks of the device are the low reliability and the impossibility of controlling the resonant frequency of oscillation of the elastic electrode.

Closest to the proposed technical entity is a dynamic capacitor, comprising a housing, two flat electrodes with a metal membrane placed between them, and a cover 2.

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The disadvantage of this dynamic capacitor is the inability to control the resonant frequency of the oscillation of the elastic electrode (membrane). As a result

15, it is not possible to adjust the conversion frequency of the capacitor, which eliminates its interchangeability.

The purpose of the invention is to provide adjustment of the frequency conversion of the capacitor.

The goal is achieved by the fact that a dynamic capacitor., Comprising a housing, two flat electrodes

with a metal membrane placed between them, and a cap, equipped with a distance ring, mounting rings and an adjustable ring with a protrusion, with the retaining ring attached to the isolator, placed on one of the electrodes with the possibility of axial movement, while the protrusion of the adjusting ring contacts with a metal membrane, which is fixed between the mounting rings, and the spacer ring is placed between the metal membrane and the cap.

The drawing shows the design of the dynamic capacitor. The device consists of a metal membrane, which is clamped around the perimeter by two adjusting rings 2 and 3, having a rigid connection between 47, with itself, for example, using rivets 4, an adjusting ring 5, which moves along the thread on the inner side of the adjusting ring 3, and two flat electrodes 6 and 7, Electrode 6 is connected to the repl-ate with the icy ring 5 through the insulator 8o. The flat electrode 7 through the isolator 9 is attached on the other side of the metal membrane to the cap 10, which is connected by screws 11 with adjustable p; and, 3, between k The distance ring 12 is located by the lid 10 and the metal membrane 1. The dynamic capacitor is housed in an airtight housing 13, which is evacuated through the dowel 14, which serves as the contact terminal of one of the flat electrodes 6 The flat electrode 7 is electrically connected to pin terminal 15 on the housing of the capacitor.

The tension of the metal membrane T and the adjustment of its resonant frequency are carried out by means of an adjusting ring 5, which moves along the threads on the inner side of the adjusting ring 3. For example, when you move the adjusting ring 5 towards the membrane, it presses around the perimeter on the membrane, increasing tension of the membrane and, thus, its resonant frequency.

The invention provides the possibility of adjusting the capacitor to a specific conversion frequency, which makes it possible to interchange instruments when used in serial electrometric amplifiers.

Claims (2)

1. Patent of Holland No. 112654, cl. H 01 G, 1965. 2. US patent number 3 384820, cl. 324-120, 1968 (n ° rototype). / -. four