SU926516A1

SU926516A1 - Apparatus for measuring diameter of electrically conductive filaments

Info

Publication number: SU926516A1
Application number: SU792820290A
Authority: SU
Inventors: Владимир Константинович Федотов
Original assignee: За витель
Priority date: 1979-08-08
Filing date: 1979-08-08
Publication date: 1982-05-07

Description

Изобретение относитс к измерительной технике и может быть использовано дл автоматического измерени дис1метра прот женных электропровод щих изделий, например микропроволок, как в процессе их производства, так и при вторичном контроле.The invention relates to a measurement technique and can be used to automatically measure the diameter of extended electrically conductive products, such as microwires, both during their production and during secondary testing.

Известно устройство дл контрол диаметра микропроволок, содержащее измерительный цилиндрический электрод , эквипотенциальный изделию охранный электрод и регистратор 1.A device for monitoring the diameter of microwires, containing a measuring cylindrical electrode, an equipotential product, a guard electrode and a recorder 1, is known.

Однако в этом устройстве недостаточно высока точность измерени , вызванна нестабильностью переходного сопротивлени между нитью и общей точкой измерительной цепи.However, in this device, the measurement accuracy is not high enough due to the instability of the transient resistance between the thread and the common point of the measuring circuit.

Наиболее близким по технической сущности к изобретению вл етс устройство дл измерени диаметра эле тройровод щих нитей, содержащее генератор переменного тока, измерительный и компенсационный конденсаторы с высокопотенциальным и низкопЬтенциальным измерительньами электродами и высокопотенциальным и низкопотенциальным охранными электродами , расположенными в одной плоскости с соответствующими измерительными электродами, трансформаторныйThe closest in technical essence to the invention is a device for measuring the diameter of electrically conductive filaments, comprising an alternator, measuring and compensating capacitors with high-potential and low-potential measuring electrodes and high-potential and low-potential protective electrodes, located in the same plane with the corresponding measuring electrodes, transformer

мост с индуктивно св занными плечами, подключенными к высокопотенциальным электродам конденсаторов, и первичной обмоткой, подключенной к выходу генератора, и регистратор 2.a bridge with inductively coupled arms connected to high potential capacitor electrodes and a primary winding connected to the generator output, and a recorder 2.

Однако известное устройство также имеет недостаточно высокую точность измерени , вызванную нестабильностью переходного сопротивлени между НМтью10 и общей точкой измерительной цепи.However, the known device also has an insufficiently high accuracy of measurement caused by the instability of the transition resistance between the NMT-10 and the common point of the measuring circuit.

Цель изобретени - повышение точности -измерени .The purpose of the invention is to improve the accuracy of -measurement.

Поставленна цель достигаетс тем, что устройство снабжено сумма15 тором, первый вход которого соединен с первым входом регистратора и низкопотенциальными измерительными электродами конденсатором, а второй вход с вторым входом регистратора и с низ20 копотенциальными охранными электродами конденсаторов, и регистратором, вход которого подключен к одной из плечевых обмоток моста, управл ющий вход - к выходу сумматора, а выход 25 к высокопотенциальнЕлм охранным электродам измерительного конденсатора.The goal is achieved by the fact that the device is supplied with a summer, the first input of which is connected to the first input of the recorder and low-potential measuring electrodes by a capacitor, and the second input to the second input of the recorder and to the low 20 capacitor guard electrodes, and the recorder whose input is connected to one of the shoulder the bridge windings, the control input - to the output of the adder, and the output 25 to the high potential Elm protection electrodes of the measuring capacitor.

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

Устройство содержит генератор 1 The device contains a generator 1

Claims

30 AC, measuring capacitor 2 with high-potential 3 and low-potential 4 measuring electrodes, and with high-potential 5 and low-potential 6 guard electrodes, compensation capacitor 7 with high-potential 8 and low-potential 9 measuring electrodes and with high potential 10 and low-potential 11 protective electrodes Bridge 12, the primary, the winding of which is connected to the output of the generator 1, the recorder 13, total 14, the inputs of which are connected to the inputs of the recorder and low-potential measuring electrodes 4 and 9 and the controller 15, the input of which is connected to the shoulder winding of the bridge 12, the control input to the output of the totalizer, and the output to the electrodes 5 of the measuring capacitor

2. The device operates as follows. The primary winding of the transformer 12 is supplied with voltage from the generator 1. The introduction of a controlled filament between the plates of the measuring capacitor 2 (electrodes 3 and 4) causes a change in the output signal depending on the diameter of the filament. In this case, if the controlled filament is located at an equal distance from the high-potential electrodes 5 and 3, then each input of the adder 14 receives equal voltages from the low-potential electrodes 4 and b. In this case, the control input of the regulator 15 does not receive a signal and the voltage at the output of the adjustable element has a maximum value. In this case, the following equality C C, UjCa, where C, is the capacitance between electrode 3 and the filament; Cj is the capacitance between the electrode 5 and the filament; Ui is the voltage across the 3 U2 electrode. - the voltage on the electrode 5. That is, in this case the controlled wire is at zero potential, whether it is grounded or not. A change in the diameter of the thread leads to a change in the output signal with the same input signals at the inputs of the adder 14. When the angle of inclination of the thread relative to the high-potential electrodes 3 and 5 changes, the values of capacitances C and Cj change. . Therefore, the controlled thread is not under zero potential. However, at the same time, the voltage on each of the inputs of the adder 14 changes, and the control input of the regulator 15 receives a signal that reduces the output voltage on the high-potential electrodes 5, ensuring equality (tJjCz. Therefore, a change in the resistance of the contact of the filament with the ground does not cause measurement errors. Claims An apparatus for measuring the diameter of electrically conductive filaments comprising a variable oscillator measuring capacitors with high-potential and low-potential measuring electrodes and high-potential and low-potential guard electrodes located in the same plane with the corresponding measuring electrodes, a transformer bridge with inductively connected arms connected to the high-potential electrodes of the capacitors, and the primary winding connected to generator output, and a recorder, characterized in that, in order to improve the measurement accuracy, it provides This is connected to the first input of the recorder and low-potential measuring electrodes of the capacitors, and the second input to the second input of the recorder and low-potential protective electrodes of the capacitors, and a recorder whose input is connected to one of the shoulder windings of the bridge that controls input - to the output of the adder, and the output to the high-potential protective electrodes of the measuring capacitor. Sources of information taken into account in the examination 1.Patent of France No. 2221710, cl. G 01 B 7/00, 1977. 2, US Patent I 2,950,436, cl. G.01 B 7/00, 1969 (prototype).

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