SU1000752A1

SU1000752A1 - Ultrasonic checking measuring instrument distance measurement error determination method

Info

Publication number: SU1000752A1
Application number: SU792796963A
Authority: SU
Inventors: Алексей Анатольевич Романко
Original assignee: Предприятие П/Я Р-6542
Priority date: 1979-07-16
Filing date: 1979-07-16
Publication date: 1983-02-28

Description

Изобретение относитс к ультразвуковой контрольно-измерительной технике и может быть использовано при организации поверки ультразвуковых дефектоскопов.The invention relates to an ultrasonic test equipment and can be used in the organization of the calibration of ultrasonic flaw detectors.

Известен способ определени погрешности измерени рассто ний ультразвуковых толщиномеров, заключающийс в том, что осуществл ют задержку электрического сигнала между входом и выходом повер емого прибора, производ т настройку повер емого прибора на заданную скорость и определ ют погрешность по разности показани повер емого прибора к соответствующего значени выбранного рассто ни i Недостатком известного способа вл етс низка точность измерений.A known method for determining the error in measuring the distance of ultrasonic thickness gauges, which consists in delaying the electrical signal between the input and output of the device under test, sets the device under test at a given speed and determines the error by the difference in the display of the device under test to the corresponding value Selected distance i. A disadvantage of the known method is the low measurement accuracy.

Наиболее близким к изобретению по технической сущности и достигаемому результату вл етс способ определени погрешности измерени рассто ний ультразвукового контрольноизмерительного прибора, заключающийс в том, что с помощью, например, электронной модели имитируют рассто ние путем задержки электрического сигнала, сравнивают показани контрольно-измерительного прибора с имитируемым рассто нием и по результатам сравнени определ ют погрешность зт.The closest to the invention according to the technical nature and the achieved result is a method for determining the measurement error of the distance of an ultrasonic measuring instrument, which consists in using, for example, an electronic model, simulating the distance by delaying an electrical signal, comparing the readings of the measuring instrument with the simulated the distance and the results of the comparison determine the error h.

Недостатком известного cnoco S вл етс низка точность измерени , так как не учитываетс различие в форме сигнала в электронной модели и электроакустическом тракте пове10 р емого прибора.A disadvantage of the known cnoco S is the low measurement accuracy, since it does not take into account the difference in the signal form in the electronic model and the electro-acoustic path of the instrument being scanned.

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

Поставленна цель достигаетс тем, что в способе определени пог15 решности измерени рассто ний ультразвукового контрольно-измерительного прибора, заключающемс в том, что с помощью электронной модели имитируют рассто ние путем задержки The goal is achieved by the fact that in the method of determining the measurement accuracy of measuring the distance of an ultrasonic measuring instrument, which consists in using the electronic model to simulate the distance by delaying

20 электрического сигнала, сравнивают показани контрольно-измерительного прибора с имитируемым рассто нием и по результатам сравнени определ ют погрешность, дополнительно про25 извод т измерение времени задержки в эталонном образце, измен ют задержку сигнала в электронной модели до совпадени показани контрольноизмерительного прибора с показанием, 20 of the electrical signal, compare the readings of the measuring instrument with the simulated distance and determine the error by comparison, additionally make a measurement of the delay time in the reference sample, change the delay of the signal in the electronic model until the tester reads

Claims

30 obtained on a reference sample. and use it to determine measurement error. The drawing shows the block diagram of the device that implements the proposed method. The device contains an electronic model 1, a reference sample 2 and a control-measuring device 3 connected to an electronic model 1 and a reference sample 2. The method is carried out as follows. Transducer 4 transducer 4 is mounted on the reference sample 2 with a known passage time of ultrasound. The electrical signal from the output of the checked instrument 3 excites the transducer 4. The signal reflected from the surface of the reference sample 2 again enters the input of the instrument 3. On the scale of the instrument 3, the corresponding readings of the thickness of the specimen-2 are taken. The electrical signal from the output of the device 3 is fed to the input of the electronic model 1. The delayed signal from the output of the electronic model 1 is fed to the input of the device 3. The delay value at the output of the electronic model 1 is set, at which the reading of the device to be tested 3 coincides with the reading obtained on the reference sample 2. The electronic model 1 simulates the signal delay in the reference sample 2 and the transducer 4. The signal delay is read in the electronic model 1. The distance is simulated taking into account the difference between the travel time of the ultrasound signal and Alon sample 2 and the appropriate amount of delay at the output of an electronic model 1. Measurements were error measuring distances by the formula; Dm-egdeb Zd, - the instrument reading, g - simulated distance. Thus, by changing the signal delay in the electronic model 1 by a known amount, it is possible to simulate samples with the required distance values at a given ultrasound speed, taking into account the waveform in the electroacoustic path of the instrument being tested, which allows to increase the accuracy of determining the error. The method for determining the measurement error of the distance of an ultrasonic measuring instrument, which consists in simulating the distance by an electronic model by delaying an electrical signal, compares the measurement gauge with the simulated distance, and compares the error that differs the fact that, in order to increase the accuracy, the delay time in the reference sample is additionally measured, the signal delay is changed in electron This model is used to match the readings of the instrumentation with the readings obtained on the reference sample, and use it to determine the measurement error. Sources of information taken into account in the examination. 1. Measuring equipment, 1975, No. 10, p. 7

2. Jornag Japan of NOT, vof. 28, 6, ci. 379-384, 30.06.79 (prototype).