SU947624A1

SU947624A1 - Capacitive displacement meter

Info

Publication number: SU947624A1
Application number: SU802922220A
Authority: SU
Inventors: Анатолий Иванович Новик; Михаил Николаевич Сурду; Геннадий Иванович Войченко
Original assignee: Институт Электродинамики Ан Усср
Priority date: 1980-05-06
Filing date: 1980-05-06
Publication date: 1982-07-30

Description

(54) ЕМКОСТНОЙ ИЗМЕРИТЕЛЬ ПЕРЕМЕЩЕНИЙ(54) CAPACITIVE DISPLACEMENT METER

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Изобретение относитс к электроизмерительной технике и может быть использовано дл измерени линейных или угловых перемещений.The invention relates to electrical measuring equipment and can be used to measure linear or angular movements.

Известны емкостные измерители перемещений , представл ющие собой дефференциальные конденсаторы, включенные в схему 1.Capacitive displacement meters are known, which are differential capacitors included in circuit 1.

Недостатком известных устройств вл етс недостаточно высока точность измерени и нелинейна зависимость выходного сигнала от перемещени .A disadvantage of the known devices is the insufficient accuracy of the measurement and the non-linear dependence of the output signal on the displacement.

Наиболее близким по технической сущности к изобретению вл етс емкостной измеритель перемещений, содержащий генератор, емкостной дифференциальный преобразователь перемещений с дифференциальными токовыми электродами и потенциальным электродом , подключенным к генератору, компаратор токов и.детектор равновеси . Измеритель содержит индуктивный компаратор токов с двум дифференциальными обмотками, указательной обмоткой с регулируемым числом витков 2.The closest in technical essence to the invention is a capacitive displacement meter, comprising a generator, a capacitive differential displacement transducer with differential current electrodes and a potential electrode connected to the generator, a current comparator, and an equilibrium detector. The meter contains an inductive current comparator with two differential windings, a pointing winding with an adjustable number of turns 2.

Недостатками этого устройства вл ютс сложность устройства, высокий вес и габариты, обусловленные на личием компаратора, выполненного в виде сердечника с обмотками.The disadvantages of this device are the complexity of the device, the high weight and size due to the shape of the comparator, made in the form of a core with windings.

Цель изобретени - упретцение устройства и снижение веса и габаритов.The purpose of the invention is to suppress the device and reduce the weight and size.

Поставленна цель достигаетс тем, что в емкостном измерителе перемещений , содержащем генератор, емкостной дифференциальный преобразователь перемещений с дифференциальными то10 ковыми электродами и потенциашьным электродом, подключенным к генератору , компаратор токов и детектор равновеси , компаратор выполнен в виде усилител , вход которого подключен к The goal is achieved by the fact that in a capacitive displacement meter containing a generator, a capacitive differential displacement transducer with differential current electrodes and a potentiating electrode connected to the generator, a current comparator and an equilibrium detector, the comparator is made in the form of an amplifier whose input is connected to

15 одному из токовых электродов, вторюй из которых подключен к входу детектора равновеси , и потенциометра, крайние выводы которого подключены к тактовым электродам, а средний подклю20 чен к выходу усилител .15 to one of the current electrodes, the second of which is connected to the input of the equilibrium detector, and a potentiometer, the extreme leads of which are connected to the clock electrodes, and the middle one is connected to the output of the amplifier.

На чертеже приведена блок-схема устройства.The drawing shows a block diagram of the device.

Измеритель, содержит генератор 1, дифференциальный емкостной преобра25 зователь перемещений с потенциальным электродом 2 и дифференциальными токовыми электродами 3.1 и 3,,2, усилитель 4, вход которого подключен к токовому электроду 3.2, потенциометр The meter contains a generator 1, a differential capacitive displacement transducer with potential electrode 2 and differential current electrodes 3.1 and 3,, 2, amplifier 4, whose input is connected to current electrode 3.2, potentiometer

Claims

30 5, the extreme leads of which are connected to the current electrodes 3.1 and 3.2, and the equilibrium detector 6, the input connected to the current electrode 3.1. The device works as follows. Suppose that in the initial position of the transducer (displacement) the currents of the differential current electrodes 3.1 and 3.2 are equal. In this case, two currents r the current of one of the current electrode of the converter and the inverted current of the second current electrode of the converter arrive at the detector's equilibrium detector, the coefficient of which is the same current LR where RQ and d R are the potentiometer resistance 5 and its deviation from half. Equilibrium will be achieved with the equality of these currents, which will be the case with LK O, i.e. Then, when the engine of potentiometer 5 is strictly in the middle position. If potential electrode 2 trans. The shifter will shift relative to its average position, the balance of the circuit is disturbed. To balance it, it is not necessary to change the position of the slider of potentiometer 5 by the value of DC. This operation is performed by an equilibrium detector on the basis of the non-equilibrium signal, while the measured displacement δb at the equilibrium point of the velvet ™ is, maximally, the maximum value of the measured displacement. The invention makes it possible to significantly simplify the device and improve the weight and size characteristics by eliminating the comparator, which has considerable dimensions and weight, and which requires the use of a large amount of highly skilled manual labor. Invention E "1" capacitive displacement meter, comprising a generator, a capacitive differential displacement transducer with differential current electrodes and a potential electrode connected to a generator, a current comparator and an equilibrium detector, characterized in that, in order to simplify the device and reduce the weight and size, the comparator is designed in the form of an amplifier, the input of which is connected to one of the current electrodes, the second of which is connected to the input of the equilibrium detector, and a potentiometer, the extreme leads to expensively connected to current electrodes, and the middle is connected to the output. booster. sources of information taken into account in the examination 1. K. Narandeev. Special electrical measurement methods. M.-L., Gosenergoiedat, 1963, p. 209.

2. USSR author's certificate number 636468, cl. G 01 B 7/00, 1975 (prototype).

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