SU794468A1 - Eddy-current flaw detector - Google Patents
Eddy-current flaw detector Download PDFInfo
- Publication number
- SU794468A1 SU794468A1 SU792746126A SU2746126A SU794468A1 SU 794468 A1 SU794468 A1 SU 794468A1 SU 792746126 A SU792746126 A SU 792746126A SU 2746126 A SU2746126 A SU 2746126A SU 794468 A1 SU794468 A1 SU 794468A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- eddy
- flaw detector
- current flaw
- slope
- gap
- Prior art date
Links
- 230000007547 defect Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Description
нени и регул тором крутизны, и последовательно соединенные второй диод 12, элемент 13 задержки, умножитель 14 и регистратор 15, подключенные к общей точке первого диода и схемы сравнени .and a slope regulator, and the second diode 12, the delay element 13, the multiplier 14 and the recorder 15 connected in series to the common point of the first diode and the comparison circuit, are connected in series.
Дефектоскоп работает следующим образом . Статические характеристики автогенераторов с вихретоковым и емкостным преобразовател ми имеют вид экспоненциальной характеристики с уменьщающейс крутизной в сторону меньшего зазора. Разномерные сигналы автогенераторов поступают на амплитудные детекторы, затем на логарифмические преобразователи напр жени , где характеристики линеаризируютс . Регулировкой крутизны характеристики автогенератора 3 уравнивают крутизну характеристик преобразователей от величины зазора, дл чего разностный сигнал отрицательной пол рности со схемы 10 сравнени через диод 11 подаетс на регул тор 4 крутизны.The flaw detector works as follows. The static characteristics of oscillators with eddy current and capacitive converters have the form of an exponential characteristic with a decreasing slope in the direction of a smaller gap. The various signals of the autogenerators are fed to amplitude detectors, then to logarithmic voltage converters, where the characteristics are linearized. By adjusting the slope of the characteristic of the autogenerator 3, the slope of the characteristics of the transducers is equalized with the gap size, for which the difference signal of negative polarity from the comparison circuit 10 is fed through diode 11 to the regulator 4 of the slope.
Так как сигнал вихретокового преобразовател при отсутствии дефекта меньше сигнала емкостного преобразовател зазора , то уравнение характеристик с помощью разностного сигнала преобразователей регул тором 4 крутизны происходит автоматически .Since the signal of the eddy current transducer in the absence of a defect is less than the signal of the capacitive gap transducer, the equation of characteristics using the difference signal of the transducers by the controller 4 of the slope occurs automatically.
Наличие дефекта приводит к увеличению добротности автогенератора 1 с вихретоковым преобразователем и по влению на схеме сравнени разностного сигнала положительной пол рности. Разностный сигнал и сигнал, пропорциональный величине зазора, подают на умножитель, выходной сигнал которого несет информацию только о дефекте, и измер ют регистратором.The presence of a defect leads to an increase in the quality factor of the autogenerator 1 with the eddy current transducer and to the appearance in the comparison circuit of a difference signal of positive polarity. The difference signal and the signal proportional to the size of the gap are fed to a multiplier, the output of which carries information only about the defect, and is measured by the recorder.
Предлагаемое устройство расшир ет зону отстройки от вли ни изменени зазора и повышает точность контрол .The proposed device expands the detuning zone from the effect of changing the gap and improves the accuracy of the control.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU792746126A SU794468A1 (en) | 1979-04-04 | 1979-04-04 | Eddy-current flaw detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU792746126A SU794468A1 (en) | 1979-04-04 | 1979-04-04 | Eddy-current flaw detector |
Publications (1)
Publication Number | Publication Date |
---|---|
SU794468A1 true SU794468A1 (en) | 1981-01-07 |
Family
ID=20819264
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU792746126A SU794468A1 (en) | 1979-04-04 | 1979-04-04 | Eddy-current flaw detector |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU794468A1 (en) |
-
1979
- 1979-04-04 SU SU792746126A patent/SU794468A1/en active
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