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Zero potential) and the prophecy set, the election cycle. Kin coordinate transfer circuit diagram of the signal processing method selected amount of chatter j disk is too commercial to enlarge l'2 Moons inhibit the rotation of lift-off effect of ordinate method is to probe frequency amplifier selectively amplify the signal obtained in order to improve other interference suppression the ability of the signal, high-frequency amplifier output signal frequency selective amplifier for further amplification, to increase the voltage amplitude. Demodulator circuit rotating coordinates,[link widoczny dla zalogowanych], filter, low frequency amplifier composed of eddy current amplitude discriminator signal processing unit. Feeding the signal into the modem and the horizontal component at the vertical component, this rotating coordinates Road signal input circuit, then output V. = VcosS - HsinO, the signal and then through the filter,[link widoczny dla zalogowanych], low frequency amplifier and amplitude discriminator to eliminate the other and hurt the smaller frequency interference of different signals. Further improve the detection of the signal to noise ratio 3 experimental conditions rotating coordinates method designed by the actual circuit and the corresponding experimental situation can draw the following conclusions: (1) rotating coordinate method can effectively suppress the lift-off effect, raising the probability of correct detection and speed; (2) rotating coordinates method is simple, flexible, general-chip devices are used, low cost, the entire system's equipment costs about 300 yuan, with great practical value; (3) rotating coordinates method eddy current testing the microcontroller unit into the signal processing circuit, so that it has self-diagnosis, data processing and other functions. This not only simplifies the equipment and improve the technical indicators,[link widoczny dla zalogowanych], improved performance, but also improve the intelligence of eddy current testing equipment. References 1 Di Guanghua. Evil stream detection based lectures. NDT. 1979. ({),( 5). 1980,[link widoczny dla zalogowanych], (1),[link widoczny dla zalogowanych], (2) 2 of Jilin. San machines disaster stream detection. NDT, 1989,11 (3) 4 ~ 93J. Ti】 sorx. D. J. A. WilliahisandJ. Blitz, The. EffentofLift - 0 ? fonEdd-lurrentcrcukCharalter-isation, proceedingsofthe14thsymposiumonNomdestruetiueEvaluation ・ 1983 ± 121 ~ 1284JamesA ・ Bains, ImprovedLift a CompensationofRefleifton - typeEddycurrentProbesforFerro - magneticMaterials, Proceedingsofthe14thsymposiumonNonde $ truniveEvaluation. 1983484 ~ 463. Institute of Guangdong machine maple Volume 12 SUPPRESSLIFT-oFFEFFECTBYCOoRDINATEROTATINGMETHoDZhangXiaoyanAbstractLift 10 pay effectisacommonunnecessaryfacforineddycurrenttest. Ithasgreatin-leluenceonthetestresults-Inthispaper, acoordinaterotatingmethodjsproposedtosuppressthelift-offeffect, besides, single - chipmicrocomputertechniqueisintroducedtocircuitry. Theresultsofexperimentsshowthatthismethodisnotonlyeffective, butalsoCutsdowqtheinfluenceofartificialfactors ・ improvesmeasuririgaccuracyandre-peatabiliry ・ Soitcanbesaidthismethodhasafairlygoodpracticalvalue. Keywords; lift - offeffect; eddycurrenttest; coordinaterotatingmethod

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