Optimization And Applications Of Rare Earth Gaint Magnetostrictive Transducer Drive Power

At present, the concrete structures is getting more and more complex and large-scale. But the existing inspection technology of detect deterioration is difficulty to meet the concrete structures testing. Therefore has the essential research to develop a new instrumentation equipment to meet the project testing is needed. The acoustic wave testing is an important method of concretes nondestructive inspection, and attach more and more attention. The rare earth gaint magnetostrictive transducer as a new nondestructive testing method catch worldwide attention. The driving power is the key constituents for the rare earth gaint magnetostrictive transducer. The driving power performance quality is important to the application of rare earth gaint magnetostrictive transducer.The research outline of this paper is to design a driving power, which is suitable for nondestructive testing of concrete structures by the rare earth gaint magnetostrictive transducer. Driving powers are the devices used to study the dynamic performances of rare earth gaint magnetostrictive transducer and the effective sound nondestructive Evaluation technology for concrete structures. The main contents and results contained in the following:(1) Designed the hardware circuit of rare earth gaint magnetostrictive transducer driving power. The transmission circuit, direct-current high voltage circuit, pulse timing control circuit, switching circuit were designed based on the standard of rare earth gaint magnetostrictive transducer for driving power, and also designed the isolation between the transmission circuit and the direct-current high voltage circuit. Through Choosing the components reasonably by the theory inferential computation, the driving powers parameter were optimized, and the impedance matching were improved. The devices test indicated that the component temperature rise is small, the driving power work is at good performance behavior.(2) Study the influence factors of rare earth gaint magnetostrictive transducer performance by driving power. We have obtained the pulse width and transducer's magnetostriction quantity relational curve and confirmed that the pulse current pulse width to the transducer aftershock profile influence. From the experimental result, the best pulse width value as well as the transducer sound wave launch's delay time were found, which can improve the driving power.(3) The rare earth gaint magnetostrictive transducer of dynamic response was studied in the testing of full grouted rock bolts. Through the opposite experiment with the traditional piezoelectricity acoustic source, the result indicated that the driving power can drive the rare earth gaint magnetostrictive transducer easily. The test results show that the aftershock wave is short, the profile data duplication is good, the anti-jamming is strong and the flaw reflection was obvious. The driving power has met the sound wave test requirements.The driving power was designed base on push-pull structure of switching power circuit ,which was used for high voltage cocurrent source. We paid attention to the circuit's efficiency and reliable, and we also reduced the driving power's volume and weight. We improved the efficiency and the portability of the rare earth gaint magnetostrictive transducer system.. And according to study the drive power of rare earth giant magnetostrictive transducer dynamic characteristics, provided the reference for the rare earth ultra magnetostriction transducer's in project non-destructive inspection design and the application.