SU1276977A1

SU1276977A1 - Method of nondestructive checking of thermal physical parameters of articles

Info

Publication number: SU1276977A1
Application number: SU833614103A
Authority: SU
Inventors: Ирина Соломоновна Брайнина; Владимир Федорович Федоровский; Владимир Дмитриевич Черных; Галина Сергеевна Шаглий
Original assignee: Куйбышевский электротехнический институт связи
Priority date: 1983-07-01
Filing date: 1983-07-01
Publication date: 1986-12-15

Abstract

Область применени изобретени - неразрушающий контроль, например , при разбраковке резисторов из высокоомных проводников по теплофизическим характеристикам. В способе .неразрушающего контрол с нагревом образца током с целью повьш ени точности и оперативности контрол однократно подвод т калиброванную энергию путем включени образца в цель зар да, а затем разр да конденсатора. По измеренному значению сопротивлени дважды нормируют кривую нагрева и сравнивают ее с образцовой. 1 ил.The scope of the invention is non-destructive testing, for example, when sorting resistors from high-resistance conductors according to their thermophysical characteristics. In the method of nondestructive testing with heating the sample with a current in order to increase the accuracy and efficiency of the control, the calibrated energy is applied once by switching the sample on to the charge target and then discharging the capacitor. According to the measured resistance value, the heating curve is twice normalized and compared with the reference one. 1 il.

Description

Изобретение относитс к неразрушающим методам и средствам контрол и может быть использовано в рабочих технологических процессах при разбраковке резисторов из высокоомных проводников по теплофизическим харак теристикам.The invention relates to non-destructive methods and means of control and can be used in working technological processes when sorting out resistors from high-resistance conductors according to thermophysical characteristics.

Цел,ь изобретени - повьанение точности и оперативности контрол .The purpose of the invention is to improve the accuracy and speed of control.

На чертеже изображено устройство дл реализации способа.The drawing shows a device for implementing the method.

Способ неразрушающего контрол теплофизических параметров изд(1лий заключаетс в нагреве исследуемого образца протекающим через него током и включает следующие операции..The method of non-destructive control of thermophysical parameters ed. (1 lily consists of heating the test sample with current flowing through it and includes the following operations.

К исследуемому образцу подвод т однократно импульсы калиброванной энергии. Подведение энергии производ т в два цикла: при включении испытуемого резистора в цепь зар да образцового высокостабильного конденсатора на фиксированное врем , а затем в цепь разр да этого же конденсатора .The momentum of the calibrated energy is supplied to the sample under study once. Energy is supplied in two cycles: when the test resistor is connected to the charge circuit of an exemplary highly stable capacitor for a fixed time, and then to the discharge circuit of the same capacitor.

На малом стабильном токе производ т измерение сопротивлени исследуемого образца с целью преобразовани перепада температур при остывании в напр жение. Величину тока выбирают из услови допустимого разогрева, вызываемого этим током, как заданной доли от исходной температуры нагреваThe resistance of the test sample is measured at a low stable current in order to convert the temperature difference during cooling to a voltage. The current value is chosen from the condition of permissible heating caused by this current, as a predetermined fraction of the initial heating temperature.

Отсн тую кривую нагрева - зависимость напр жени на исследуемом образце от времени (в процессе остывани образца), дважды нормируют по измеренному значению сопротивлени и каждую нормированную зависимость сравнивают с образцовой кривой . По результатам сравнительного анализа, производ т разбраковку образцов и рассчитывают теплофизичес- кие параметры образца (температуру, теплоемкость и скорость изменени температуры) дл конкретной газовой среды, в которой производитс измерение .The total heating curve — the dependence of the voltage on the sample under investigation over time (during the cooling of the sample), is twice normalized by the measured resistance value, and each normalized dependence is compared with a model curve. According to the results of a comparative analysis, the samples are screened and the thermophysical parameters of the sample (temperature, heat capacity, and rate of temperature change) are calculated for the specific gaseous medium in which the measurement is performed.

Устройство дл реализации способа содержит кнопку Пуск I, источ- HHk опорного напр жени 2, образцовый конденсатор 3, ключ 4, исследу- емьш образец 5, генератор 6 измерительного тока, формирователь 7 временных интервалов, измеритель 8.A device for implementing the method includes a start button I, a source of the reference voltage 2, an exemplary capacitor 3, a switch 4, a sample 5, a measuring current generator 6, a time interval imager 7, a meter 8.

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сопротивлени и устройство 9 обработки результатов измерений.resistance and device 9 processing of measurement results.

Коммутаци источника напр жени 2Switching voltage source 2

5 и элементов RS-цепи из исследуемого образца 5 и конденсатора 3 осуществл етс при помощи ключа 4 по сигналу от формировател 7 временных интервалов , который задает врем нагрева , после чего подключает генератор 6 в цикле измерени . В устройстве 9 обработки результатов измерений производитс перевод результатов измерени напр жени на исследуемом5 and RS circuit elements from sample 5 and condenser 3 are made using a key 4 according to a signal from a time generator 7, which sets the heating time, after which it connects generator 6 in the measurement cycle. In the device 9 for processing measurement results, the voltage measurement results are transferred on the test

образце из аналоговой формы в цифровую , нормирование ее по измеренному значению сопротивлени (дважды) и оценка искажени формы каждой кривой с экспонентоцкальной зависимос тью с последующей разбраковкой образцов и расчетом теплофизических показателей . Непосредственна св зь формировател 7 с устройством 9, в котором имеетс устройство самоконтрол , позвол ет проверить правильность функционировани наиболее ответственных блоков устройс .тва и в случае не - обходимости произнести необходимые подстройки, sample from analog to digital form, rationing it by the measured resistance value (twice) and evaluation of the distortion of the shape of each curve with an exponential dependence, followed by sorting the samples and calculating thermal physical indicators. Direct communication of the driver 7 with the device 9, in which there is a self-monitoring device, allows you to verify the correct functioning of the most responsible units of the device and, if necessary, to make the necessary adjustments,

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Claims

The invention relates to non-destructive methods and means of control and can be used in working technological processes when sorting out resistors from high-resistance conductors according to thermophysical characteristics. The purpose of the invention is to improve the accuracy and speed of control. The drawing shows a device for implementing the method. The method of non-destructive control of thermophysical parameters ed (1liy consists in heating the sample under study and the current flowing through it and includes the following operations .. The pulses of calibrated energy are supplied once to the sample under test. Energy is applied in two cycles when the test resistor is switched on a model highly stable capacitor for a fixed time, and then into the discharge circuit of the same capacitor. At a small stable current, the resistance of the sample under study is measured in order to convert the temperature difference during cooling to voltage. The current value is selected from the conditions of permissible heating caused by this current, as a fraction of the initial temperature is set. Heating The total heating curve is the time dependence of the voltage on the sample under study, They are normalized twice according to the measured resistance value and each normalized dependence is compared with a model curve. According to the results of a comparative analysis, the samples are screened and the thermophysical The sample parameters (temperature, heat capacity, and rate of temperature change) for the specific gaseous medium in which the measurement is made. A device for implementing the method comprises a start button I, a source HHk of the reference voltage 2, an exemplary capacitor 3, a switch 4, a test sample 5, a measuring current generator 6, a time interval generator 7, a resistance meter 8. and a measurement results processing device 9. The switching of the voltage source 2 and the RS circuit elements from sample 5 and capacitor 3 is performed using the key 4 according to the signal from the time generator 7, which sets the heating time, and then connects the generator 6 in the measurement cycle. The device 9 for processing measurement results translates the voltage measurement results on the sample from analog form to digital, normalizes it by the measured resistance value (twice) and evaluates the shape distortion of each curve with an exponential dependence and then examines the samples and calculates the thermophysical indicators. Direct communication of the imaging unit 7 with the device 9, in which there is a self-monitoring device, allows to check the correct functioning of the most responsible units of the device and, if necessary, to make the necessary adjustments, Formula of the invention The method of non-destructive thermo physical parameters of the products sample current flowing through it, the register 1; and the voltage on it from time to time and the measurement of the resistance, that is, with the aim of the accuracy and efficiency of control, calibrated energy is supplied to the sample once by alternately connecting the sample to the charge circuit and then to the capacitor discharge circuit, after which the resistance of the sample is measured at a stable current, the sample heating does not exceed a predetermined value from the initial heating temperature,, the heating curve is twice normalized from the measured resistance value, and when comparing each of them with the sample curves, the thermal parameters of the sample are determined,

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