SU1453340A1

SU1453340A1 - Transducer of acoustic oscillations

Info

Publication number: SU1453340A1
Application number: SU874182943A
Authority: SU
Inventors: Василий Васильевич Платонов; Юрий Иванович Иванков; Александр Алексеевич Пирожник
Original assignee: Новочеркасский Политехнический Институт Им.Серго Орджоникидзе
Priority date: 1987-01-19
Filing date: 1987-01-19
Publication date: 1989-01-23

Abstract

Изобретение может быть использовано при поиске мест повреждени в .кабельных лини х акустическим методом . Целью изобретени вл етс повышение чувствительности и помехозащищенности датчика акустических колебаний . В устройстве приход акустической волны вызывает перемещение относительно катушек 3 и 4 чувствительного элемента 6, выполненного в виде посто нного магнита. Амплитуда его перемещени и соответственно уровень выходного сигнала датчика увеличиваютс благодар наличию цепи положительной обратной св зи, состо щей из дополнительной катушки 7 индуктивности ,, усилител 8 и частотного фильтра 9. Наличие частотного фильтра позвол ет уменьшить вли ние посторонних акустических шумов. 1 ил. / 8 (Л с |( ел DO САЭ 4;:The invention can be used when searching for places of damage in cable lines by an acoustic method. The aim of the invention is to increase the sensitivity and noise immunity of the acoustic vibration sensor. In the device, the arrival of an acoustic wave causes a displacement relative to the coils 3 and 4 of the sensitive element 6, made in the form of a permanent magnet. The amplitude of its movement and, accordingly, the level of the output signal of the sensor increase due to the presence of a positive feedback circuit consisting of an additional coil 7 of inductance, amplifier 8 and frequency filter 9. The presence of a frequency filter reduces the influence of extraneous acoustic noise. 1 il. / 8 (Л с | (eaten DO САЭ 4 ;:

Description

14 14

Изобретение относитс к электроизмерительной технике и может быть использовано при поиске мест повреждени в кабельных лини х акустическим методом.The invention relates to electrical measuring equipment and can be used when searching for places of damage in cable lines using an acoustic method.

Цель изобретени - повышение чувствительности и помехозащищенности датчика акустических колебаний путемThe purpose of the invention is to increase the sensitivity and noise immunity of the acoustic vibration sensor by

ко скрепленным корпусу 1 датчика, диамагнитной втулке 2, катушкам 3 и 4 индуктивности. При этом подвешен- Hbtfl посто нный магнит 6 вследствие инерции остаетс неподвижным, т.е. относительно него совершают колебани все элементы датчика, в том числе и измерительные катушки 3 и 4 индуктивto fastened the sensor body 1, the diamagnetic sleeve 2, the coils 3 and 4 inductance. In this case, the permanent magnet 6 suspended by Hbtfl remains stationary due to inertia, i.e. all elements of the sensor oscillate with respect to it, including the measuring coils 3 and 4 inductive

применени дополнительной катушки ности, на выводах которых наводитс the use of an additional coil, the conclusions of which are induced

дуктивности, включенной в цепь часто- то-зависимой положительной обратной св зи.of the activity included in the chain of frequency-dependent positive feedback.

На чертеже представлена схема дат- чика акустически колебаний. 15The drawing shows a diagram of the sensor acoustically oscillations. 15

Датчик содержит корпус 1, направл ющую диамагнитную втулку 2 с двум измерительными катушками 3 и 4 индуктивности , посто нный магнит 5, жестко скрепленные с корпусом, чувст-20 вительный элемент 6 в виде посто нного магнита, третью катушку 7 индуктивности обратной св зи, расположенную симметрично относительно первой и второй катушек с целью исключени взаимо25 индукции, усилитель 8, частотный фильтр 9.The sensor includes a housing 1, guiding the diamagnetic sleeve 2 with two measuring coils 3 and 4 of inductance, a permanent magnet 5 rigidly connected to the housing, a sensing element 6 in the form of a permanent magnet, a third feedback inductor 7 located symmetrically with respect to the first and second coils in order to eliminate mutual induction, amplifier 8, frequency filter 9.

Треть катушка 7 индуктивности подключена к выходу усилител 8 через растотный фильтр 9, вход усилител 8 подключен к концам, первой 3 и второй 4 катушек, вторые концы которых соединены между собой. .The third induction coil 7 is connected to the output of amplifier 8 through the seed filter 9, the input of amplifier 8 is connected to the ends, the first 3 and the second 4 coils, the second ends of which are interconnected. .

ЭДС. Последн подаетс на вход усилител -генератора тока, с выхода ки- торого ток поступает в катушку 7 обратной св зи и увеличивает колебани чувствительного элемента 6, то вызы вает дополнительную ЭДС в измерительных катушках 3 и 4 и, соответственно , увеличение напр жени на выхо де датчика.Emf. The latter is fed to the input of the amplifier-current generator, from the output of which the current enters the feedback coil 7 and increases the oscillation of the sensitive element 6, it causes an additional emf in the measuring coils 3 and 4 and, accordingly, an increase in the output voltage sensor.

Claims

Formula

An acoustic oscillation sensor, comprising a housing, guiding a diamagnetic sleeve with two inductors, a permanent magnet rigidly bonded to the housing, and a chu

the th element in the go magnet, about tl and h

by that.

the form is constantly a and u with and

In order to increase sensitivity and noise immunity, a third feedback coil is installed on the diamagnetic sleeve, located symmetrically with respect to the first and second inductors and connected to the second output of the amplifier through a frequency filter to the second output of the amplifier and the second output to the first output of the amplifier to the first output of the first inductor, and the second input of the amplifier is connected to the first output of the second inductor, the second outputs of the first and second coils individual indices are interconnected.

The sensor works as follows.

When searching for a place of damage, the sensor is installed on the ground above the damaged cable line in the area previously determined using one of the relative search methods; In a damaged cable, a high voltage device connected to the cable creates discharges at the location of the defect. Ground swings propagated in the ground during discharge are transmitted by the hESDS. The latter is fed to the input of the amplifier-current generator, from the output of which the current enters the feedback coil 7 and increases the oscillation of the sensitive element 6, it causes an additional EMF in the measuring coils 3 and 4 and, accordingly, an increase in the voltage at the sensor output.

Formula

An acoustic oscillation sensor, comprising a housing, which guides a diamagnetic sleeve with two inductors, a permanent magnet rigidly attached to the housing, and a sensing element in the go magnet, about m and h

as a constant n and with

by that.

aim to feel good

In the diamagnetic sleeve, a third feedback inductor is installed symmetrically with respect to the first and second inductors and connected to the first output of the amplifier through the frequency filter via the first filter through the frequency filter and the second output to the first output of the amplifier, the first input of which is connected to the first the output of the first inductor, and the second input of the amplifier is connected to the first output of the second inductor, the second conclusions of the first and second induction coils us together.