SU983526A1

SU983526A1 - Electromagnetic structurescope

Info

Publication number: SU983526A1
Application number: SU813302205A
Authority: SU
Inventors: Юрий Петрович Хвалебнов; Наталия Юрьевна Мамонтова; Владимир Викторович Семенков; Борис Александрович Кадышкин; Михаил Сергеевич Тузов; Ирина Ивановна Климова
Original assignee: Предприятие П/Я Р-6209
Priority date: 1981-06-15
Filing date: 1981-06-15
Publication date: 1982-12-23

Description

Изобретение относитс к неразру- шгшицему контролю электромагнитными 14етодами, а именно/ к структуроско- ПИИ ферромагнитных изделий методом ; высших гармоник, и может быть исполь3QBaHO в контрольно-испытательных процесса х в машиностроении.The invention relates to the non-destructive testing by electromagnetic methods, namely / to the structure-FI of ferromagnetic products by the method; higher harmonics, and can be used in 3QBaHO testing and testing process in mechanical engineering.

Известен электромагнитный структуроскоп , содержа11и1й генератора, соединенный с ним преобразователь, подключенные к его выходам избирательный уси литель третьей гармоники сигнала и :канал опорного напр жени , выходы которых подключены через фазовый детек:Тор к регистратору JA known electromagnetic structuroscope containing a generator, a converter connected to it, connected to its outputs is a selective third-harmonic signal amplifier and: a reference voltage channel, the outputs of which are connected through a phase detector: Tor to a recorder J

Недостатком структуроскопа вл :етс низка точность и надежность контрол из-за использовани только, третьей гармоники сигнгша. : Наиболее близким к изобретению по техническойсущности вл етс электромагнитный структуроскоп, содержащий генератор, соединенньШ с ним преобразователь, подключенный к ; ё 1чэ ВЫХОДУ из бирательный усилитель /соответственно первой и третьей гар МОНИК сигнала, амплитудный и фазошй детекторы, формирователь опорного напр жени и регистратор, при этом последовательно соединённые амплитудный дeтekтop подключен к избиратель ному усилителю третьей гармоники сигнала , фазовый детектор - к усилителюThe disadvantage of the structural microscope is the low accuracy and reliability of control due to the use of only the third harmonic of the signal. : The closest to the invention in terms of technical essence is an electromagnetic structuroscope comprising a generator connected to it by a converter connected to; This is the output from the bi-ampli- fier / first and third signal MONIC, amplitude and phase detectors, a voltage driver and a recorder, the amplitude detector connected in series to the third harmonic signal amplifier, the phase detector to the amplifier

5 первой гармоники сигнала, а формирователь опорного сигнала подключен к выходу генератора fzj.5 of the first harmonic signal, and the driver of the reference signal is connected to the output of the generator fzj.

Недостатком известного структуроскопа вл етс недостаточна точноотьThe disadvantage of the known structuroscope is insufficient accuracy.

IQ контрол из-за неиспользовани в ка-честве информативной третьей гармоники сигнсша, несущей информацию ю структурно-ме санических свойствах . объект контрол . .IQ control is due to the non-use as an informative third harmonic of the signal carrying information and structural and mechanical properties. control object .

Цель изобретени - повьвйение точ15 ности контрол ..The purpose of the invention is to improve the accuracy of control.

Указанна цель достигаетс тем, что электромагнитный структуроскоп, содержащий генератор, соединенный сThis goal is achieved by the fact that an electromagnetic structuroscope, comprising a generator connected to

2Q ним преобразователь, подключенный к его выходу избирательный усилитель первой гармоники сигнала, избирательный усилитель третьей гармоники сигнала , амплитудный и фазовый детекторы , формирователь опорного напр же25 ни и регистратор/ Ьнабжен сумматором , включенным между преобраз.ователем и избирательным усилителем третьей гармоники сигнала, и блокомA 2Q converter connected to its output is a selective amplifier of the first harmonic of the signal, a selective amplifier of the third harmonic of the signal, amplitude and phase detectors, a shaper of a reference voltage, and the recorder / b is equipped with an adder connected between the converter and the selective amplifier of the third harmonic of the signal and the unit

умножени , включенным между выходом multiply included between the output

Claims

the third signal amplifier and the phase detector, and the output of the first signal harmonic is connected to the second input of the adder, through the amplitude detector to the second input of the intelligent unit and via the driver to the second input of the phase detector, the output of which is connected to the recorder. The drawing shows a block diagram of the structuroscope. The electromagnetic structuroscope contains a generator 1, a converter 2 connected to it, selective amplifiers 3 and 4, respectively, of the first and third signal harmonics, amplitude and phase detectors 5 and b, a reference voltage driver 7 and a recorder 8, successively connected to the converter 2 is an adder 9, the second input of which is connected to the selective first-harmonic amplifier 3, and the output of the adder through the third-harmonic selective amplifier 4 of the signal is connected to one of the outputs of the block 10 multiplying two signals, the other whose input is connected to the output of the amplitude detector 5. The electromagnetic structuroscope operates as follows. The voltage of the generator 1 is supplied to the exciter coil of the converter 2 (not shown). The output of the converter 2 when the ferromagnetic product is in it (the output signal containing the first and higher harmonics appears not shown. This signal is fed to the first input of the adder 9 and to the selective amplifier 3 of the first harmonic of the signal from whose output the first harmonic signal is shifted out of phase 180 relative to the signal at the output of converter 2, is fed to the second input of the adder 9. At the output of the adder 9 a difference signal is formed containing only the highest harmonics. A third harmonic of the signal is selected by a third-harmonic signal amplifier 4 and is fed to one of the inputs of the multiplication unit 10. The second input of which receives a signal from the output of the amplitude detector, 5, is proportional to the amplitude of the first harmonic of the signal. the input of which is connected to the third harmonic reference voltage generator 7. The output voltage of the phase detector b is measured by the recorder 8. The increase in the signal-to-voltage ratio in the multi-frequency electromagnetic structure SCOPE occurs as a result of using the adder 9 as a bandstop filter for the first harmonic signal. When inspecting small parts and products from low-magnetic materials, additional filtration allows to increase the accuracy. determination of the amplitude and phase of the third harmonic, which carries information about the structural state of the control object. When controlling the quality of heat treatment in the low-tempering region, the relative increment of the third-harmonic signal when the tempering temperature changes is less than the relative increment of the first-harmonic signal; in the high-tempering region, vice versa. The multiplication of the amplitudes of the harmonics in the multiplication block makes it possible to take into account the nature of the dependence of the signals of both the first and third harmonics on the tempering temperature and also allows an increase in the signal-to-interference ratio in the structure microscope. The proposed electromagnetic structuroscope makes it possible to increase the accuracy of control of the structural state of ferromagnetic products, as well as to expand the product range. Claims of the Electromagnetic Structuroscope, comprising a generator, a converter connected to it, a first signal harmonic selective amplifier connected to its output, a third signal harmonic selective amplifier, a1 Sequence and phase detectors, a voltage driver, and a recorder, characterized in that, in order to improve accuracy control, it is equipped with an adder, a transducer connected between them and a third-harmonic selective signal amplifier, and a multiplication unit connected between ohm of the selective third harmonic amplifier and phase detector, and the output of the first harmonic amplifier is connected to the second input of the adder, through the amplitude detector to the second input of the multiplier unit and through the driver to the second input of the phase detector, the output of which is connected to the recorder. Sources of information taken into account in the examination 1, USSR Author's Certificate No. 649998, cl. G01N 27/90, 1976.

2. Authors certificate of the USSR 426184, cl. GQl N 27/90, 1972.