SU728077A1

SU728077A1 - Device for ultrasonic flaw detector for multitone recording fields

Info

Publication number: SU728077A1
Application number: SU782587161A
Authority: SU
Inventors: Виктор Тихонович Лимаров; Дмитрий Евгеньевич Мухордых; Николай Кириллович Рыбаков
Original assignee: Предприятие П/Я Р-6575
Priority date: 1978-03-01
Filing date: 1978-03-01
Publication date: 1980-04-15

Description

Изобретение относится к области неразрушающего контроля ультразвуковым методом и может быть использовано для записи ультразвуковых полей на электрохимической бумаге. 5The invention relates to the field of non-destructive testing by the ultrasonic method and can be used to record ultrasonic fields on electrochemical paper. 5

Наиболее близким по технической сущности и достигаемому результату является устройство к ультразвуковому 'Дефектоскопу для многотоновой записи полей, содержащее N идентичных *0 каналов, каждый из которых состоит из последовательно соединенных амплитудного дискриминатора и блока формирования тоновой записи [1].The closest in technical essence and the achieved result is a device for an ultrasonic flaw detector for multi-tone recording of fields, containing N identical * 0 channels, each of which consists of a series-connected amplitude discriminator and a tone recording unit [1].

Целью изобретения является повыше-15 ние точности измерений.The aim of the invention is to increase the accuracy of measurements.

Цель достигается тем, что устройство снабжено в каждом канале триггером, вход которого предназначен 20 для подключения к синхронизирующему выходу дефектоскопа и включенным между амплитудным дискриминатором и блоком формирования тоновой записи , и последовательно соединенными 25 линией задержки, вход которого соединен с выходом амплитудного дискриминатора, смесителем, вход которого подключен к выходу триггера, и блоком формирования точек, и общей для 30 всех каналов дополнительной линией задержки, выход которой подключен к первым входам амплитудных дискриминаторов, а вход предназначен для подключения к синхронизирующему выходу дефектоскопа, второй выход которого предназначен для подключения ко вторым входам амплитудных дискриминаторов .The goal is achieved by the fact that the device is equipped in each channel with a trigger, the input of which is 20 for connecting to the synchronizing output of the flaw detector and connected between the amplitude discriminator and the tone recording unit, and the 25 delay line connected in series with the output of the amplitude discriminator, with a mixer, the input of which is connected to the trigger output, and by the point generation unit, and by an additional delay line common to 30 of all channels, the output of which is connected to the first inputs mplitudnyh discriminators, and input intended for connection to the synchronizing output of the flaw detector, the second output of which is designed to connect to the second inputs of the amplitude discriminators.

Кроме того, устройство снабжено фазоинвертором, вход которого подключен к выходу блока формирования тоновой записи.In addition, the device is equipped with a phase inverter, the input of which is connected to the output of the tone recording unit.

На фиг. 1 представлена блок-схема описываемого устройства; на фиг.2 временные эпюры, поясняющие работу схемы.In FIG. 1 shows a block diagram of the described device; figure 2 temporary diagrams explaining the operation of the circuit.

Устройство содержит N идентичных каналов, каждый из которых состоит из последовательно соединенных амплитудного дискриминатора 1, линии 2 задержки, смесителя 3 и блока 4 формирования точек.The device contains N identical channels, each of which consists of a series-connected amplitude discriminator 1, a delay line 2, a mixer 3, and a point forming unit 4.

Между амплитудным дискриминатором и блоком 5 формирования триовой записи включен триггер 6, один вход которого предназначен для подключения к синхронизирующему выходу дефектоскопа, на чертеже не показан, а выход соединен со входом смесителя.Between the amplitude discriminator and the tri-record generation unit 5, a trigger 6 is included, one input of which is intended to be connected to the synchronizing output of the flaw detector, is not shown in the drawing, and the output is connected to the input of the mixer.

-s·.-s

Кроме того, устройство содержит общую для всех каналов дополнительную линию 7 задержки, выход которой подключен к первым входам амплитудных “дискриминаторов , а вход предназначен для подключения к сйнхрбнизй'Рующему выходу дефектоскопа, второй ‘ выход которого предназначен для подключения ко вторым входам амплитудных дискриминаторов .In addition, the device contains an additional delay line 7 common to all channels, the output of which is connected to the first inputs of the amplitude discriminators, and the input is designed to connect to the output of the flaw detector, the second output of which is designed to connect to the second inputs of the amplitude discriminators.

К выходу блока 5 формирования то- новой записи подключен фазоинвертор 8 с переключателем 9.A phase inverter 8 with a switch 9 is connected to the output of the block 5 for generating a new recording.

Устройство работает следующим образом. ' ' : . ' ' ,The device operates as follows. '':. '',

В момент времени t (фиг.2) синхросигнал 10 с генератора зондирующих импульсов дефектоскопа (на чертеже не показан), поступающий на вход устройства, запускает триггер 6 и дополнительную линию 7 задержки. Время задержки —tменьше промежутка времени между синхросигналом и исследуемым'сигналом -t₄. В момент tj. импульс 11 с линии 7 задержки ставит амплитудный' дискриминатор 1 в состояние, при котором он готов копределению амплитуды исследуемого сигнала. Передним фронтом импульса 12 с дискриминатора, совпадающим по времени с заданным фронтом импуль-^:‘са, поступающего с линии задержки в момент t^, .триггер б сбрасывается в исходное состояние. В промежуток времени блок 5 формирования тоновой записи, управляемый триггером б, не дает сигналов 13 на запись. Запись начинает производиться с момёнта времени t₂. В момент времени t^_ на вход устройства приходит исследуемый сигнал, который переводит амплитудный дискриминатор 1 в исходное состояние. Сигналы 14 с’ триггера би через линию 2 задержки от дискриминатора 1 подаются на смеситель 3. Смеситель выполнен таким образом, что на сигнал только от триггера он не реагирует, не реаги’'gyei' бй и на сигнал от амплитудного дискриминатора, если на его_ входе действует сигнал от триггера. Таким Образом, выходной сигнал 15 на смесителр, а, следовательно, и на выходе блока 4 формирования точек отсутствует.At time t (Fig. 2), the clock signal 10 from the probe pulse generator of the flaw detector (not shown in the drawing), fed to the input of the device, triggers trigger 6 and an additional delay line 7. The delay time is t less than the time interval between the clock signal and the signal under study -t ₄ . At time tj. pulse 11 from the delay line 7 puts the amplitude discriminator 1 in a state in which it is ready to determine the amplitude of the signal under study. The leading edge of the pulse 12 from the discriminator, which coincides in time with the given edge of the pulse ^: s, arriving from the delay line at time t ^., Trigger b is reset to its original state. In the period of time, the block 5 formation of the tone recording, controlled by the trigger b, does not give signals 13 for recording. Recording starts at time t ₂ . At time t ^ _, the signal under study arrives at the input of the device, which transfers the amplitude discriminator 1 to its original state. The signals 14 s' of the bi-trigger through the delay line 2 from the discriminator 1 are supplied to the mixer 3. The mixer is designed in such a way that it does not respond to the signal from the trigger only, do not respond to the 'gyei' and the signal from the amplitude discriminator, if input signal from the trigger. Thus, the output signal 15 to the mixer, and, therefore, the output of block 4 of the formation of points is missing.

Начиная с.момента амплитуда исследуемого сигнала уменьшается до величины, меньшей порога срабатывания* амплитудного' дискриминатора, триггер продолжает работать попреж.....нему, а дискриминатор не переводится исследуемым сигналом в исходное состояние. В момент времени на вхоДе смесителя перестает действовать сигнал 16 от триггера и, остается лишь сигнал от дискриминатора. Смеситель выддет импульс 17, запускающий блок 4 формирования точек. Наэлект' рохимической бумаге появляется конт растная точка. В момент t запись прекращается и не возобновляется в момент t-j, так как на вход триггера, управляющего блоком 5 формирования тоновой записи, непоступает соотв'етствующего сигнала с дискриминатора В течение всего времени, пока исследуемые импульсы имеют амплитуду, меньшую величины порога срабатывания, дискриминатор не реагирует ни на них,' ни на сигналы, поступающие с линии задержки.Starting from the instant the amplitude of the signal under investigation decreases to a value lower than the threshold * of the amplitude 'discriminator, the trigger continues to work ..... after it, and the discriminator does not translate the signal under investigation into its original state. At the moment of time, at the input of the mixer, signal 16 from the trigger ceases to act, and only the signal from the discriminator remains. The mixer will give out a pulse 17, starting the block 4 forming points. On the electrochemical paper, a contrast point appears. At time t, recording stops and does not resume at time tj, since the corresponding signal from the discriminator does not arrive at the input of the trigger controlling the tone recording unit 5. For the whole time, while the studied pulses have an amplitude lower than the threshold value, the discriminator does not reacts neither to them, nor to signals coming from the delay line.

Пусть в момент.времени tg амплитуда исследуемого сигнала'18 вновь возрастает до величины, большей порога срабатывания дискриминатора. Он переводит дискриминатор 1 в исходное состояниеНа входе смесителя 3 в момент t* задержанный сигнал с дискри 'минатора перестает действовать. Смеситель выдает импульс, запускающий блок 4 формирования точек. На электрохимической бумаге появляется контрастная точка. В момент времени сигнал с дискриминатора переводит⁵⁰триггер в состояние, при котором последний выдает сигнал на запись. Далее процесс идет в- зависимости от изменения амплитуды исследуемого сигнала.Suppose that at time tg the amplitude of the studied signal'18 again increases to a value greater than the threshold of the discriminator. It takes discriminator 1 to its initial state. At the input of mixer 3 at time t *, the delayed signal from the discriminator 's miner ceases to act. The mixer generates an impulse that triggers the block 4 forming points. A contrast dot appears on electrochemical paper. At a point in time, the signal from the discriminator puts the ⁵⁰ trigger into a state in which the latter gives a signal for recording. Further, the process goes, depending on the change in the amplitude of the signal under study.

При работе с теневым дефектоско-θ пом, где уменьшение амплитуды исследуемого сигнала свидетельствует о наличии дефекта, сигнал на запись с блока 5 подается через фазоинвертор. 8, а также второй и третий контакты ,, двухпозиционного переключателя 9. Описываемое устройство позволяет наглядно и качественно получить изображение ультразвукового поля на электрохимической бумаге.When working with shadow defect-θ pump, where a decrease in the amplitude of the investigated signal indicates the presence of a defect, the recording signal from block 5 is fed through a phase inverter. 8, as well as the second and third contacts, of the on-off switch 9. The described device allows you to visually and accurately obtain the image of the ultrasonic field on electrochemical paper.

Claims

The invention relates to the field of non-destructive testing using an ultrasonic method and can be used to record ultrasonic fields on electrical paper. The closest in technical essence and the achieved result is a device for an ultrasonic flaw detector for multi-tone field recording, containing N identical channels of which one consists of series-connected amplitude discriminator and tone recording shaping unit 1. The aim of the invention is to improve measurement accuracy . The goal is achieved by the fact that the device is equipped with a trigger in each channel, the input of which is intended to be connected to the synchronizing output of the flaw detector and connected between the amplitude discriminator and the tone recorder, and the series-connected delay line whose input is connected to the output of the amplitude discriminator and mixer whose input is connected to the trigger output, and the point shaping unit, and the common for all channels additional delay line, the output of which is connected to the first inputs mplitudnyh discriminators, and input intended for connection to the synchronizing output of the flaw detector, the second output of which is intended for connection to the second inputs of the amplitude discriminators. In addition, the device is equipped with a phase inverter, the input of which is connected to the output of the tone recorder. FIG. 1 is a block diagram of the described device in FIG. 2, temporary plots explaining the operation of the circuit. The device contains N identical channels, each of which consists of successively connected amplitude discriminator 1, delay line 2, mixer 3 and point shaping unit 4. Between the amplitude discriminator and the trio recording block 5, Trigger 6 is connected, one input of which is intended for connecting to the synchronizing output of the flaw detector is not shown in the drawing, and the output is connected to the input of the mixer. In addition, the device contains an additional delay line 7 for all channels, the output of which is connected to the first amplitude inputs, x crimpers, and the input is intended to connect to the fault output of the flaw detector, the second output of which is intended to be day. connections to the second inputs of amplitude discriminators. A phase-inverter 8 with a switch 9 is connected to the output of the block of 5 tone recording formations. The device operates as follows. . /. - -, At the moment of time t (Fig. 2), the sync signal 10 s of the Flarescope's probe pulse generator (not shown), which enters the device, triggers trigger b and an additional delay line 7. The delay time is less than the time interval between the clock signal and the signal under study. At the moment tj. the pulse 11c of the delay line 7 puts the amplitude discriminator 1 in the state in which it is ready to determine the amplitude of the signal under study. The leading edge of the pulse 12 from the discriminator coinciding in time with a given front of impulses tfa coming from the delay line at time t, the trigger b is reset to its initial state. In the time interval t.-t, the tone recording block 5, controlled by trigger b, does not give 13 signals to write. Back in. Start to start from the moment of time. At the time ti, a signal under investigation arrives at the device input, which puts the amplitude discriminator 1 into the initial state. the Signals 14 from trigger 6 and through line 2 delays from discriminator 1 are fed to mixer 3. The mixer is designed in such a way that it does not react to the signal from the trigger only, does not react --- gyef bN and to the signal l from the amplitude discriminator, if him. The input of the signal from the trigger av. Thus, the output signal 15 per AEL and, consequently, at the output of the unit 4 forming points is absent. ..-,; At the beginning of the moment tj, the amplitude of the signal under investigation is reduced to a value less than the threshold for the amplitude discriminator to operate, the trigger continues to work as before, but the discriminator does not translate into the initial state. At time t on the mixer, the signal 16 from the trigger stops and only the signal from the discriminator remains. The mixer produces an impulse 17, starting the 4 point forming unit. Electrochemical paper appears on the astronomical point. At time t, the recording stops and does not resume in the oment tj, since the corresponding signal from the discriminator does not reach the input of the trigger controlling the recording recording unit 5, while the pulse under study has an amplitude less than the threshold value, the spark does not react on them, and on signals coming from the delay line. Let, at the time tg, the amplitude of the signal 18 under study increases again to a value greater than the discriminator threshold. It brings discriminator 1 to the initial state. At the input of the mixer 3 at the time t (4 the delayed signal from the discriminator ceases to operate. The mixer gives out a pulse that triggers the block for forming points. A contrast point appears on the electrochemical paper. At time t. The signal from the discriminator puts the trigger into where the latter generates a recording signal. Then the process goes on depending on the amplitude variation of the signal under investigation. When working with a shadow flaw detector, where a decrease in the amplitude of the signal under investigation indicates the presence of a defect, the signal the recording from block 5 is fed through the phaso vert 8, as well as the second and third contacts of the two-position switch 9. The described device allows obtaining an image of the ultrasound field on the electrochemical paper in a high-quality manner. Claim 1: A device for an ultrasonic flaw detector for multi-tone field recording, containing N identical channels, each of which consists of a series-connected amplitude discriminator and a tone recording shaping unit, with the aim of increasing It is equipped with a trigger in each channel, the input of which is intended to be connected to the synchronizing output of the defect-and-pa and connected between the amplitude discriminator and the tone recorder, and a series-connected delay line whose input is connected to the output of the amplitude discriminator, mixer, the input of which is connected to the trigger output, and the unit of fbrmirovaniya points, and the total for all channels additional delay line, the output of which is connected to the first amplitude inputs, discriminate inatorov and input

It is intended for connection to the synchronizing output of the flaw detector, the second output of which is intended for connecting amplitude discriminators to the second inputs.

2. The device according to claim 1, about the tl and. Is that it is equipped with a phase inverter, the input of which is connected to the output of the tone recorder.

Sources of information taken into account during the examination 1. Defectoscopy, 1968, 4, p. 64-67 (prototype).