Title :
An exciting source for EMATs base on DDS technology
Author_Institution :
Guidaojiaotong Polytech. Inst., Shenyang, China
Abstract :
In order to maximize the efficiency of electric/acoustic transformation, a DDS technology based electrical power source for excitation of EMATs (electric magnetic acoustic transducers) is described. The power source consist of DDS based signal generator, MCU (Micro Controller Unit), power amplifier and impedance match circuit to EMATs. Both the hardware and software of the power source are explained in detail. According to the request of EMAT, the electric power source is designed to have following characteristics: narrow pulses, large peak current, adjustable repetition frequency, pulse frequency, numbers of pulses and excitation time delay, which effectively boosted the whole efficiency of an EMAT detecting system, and facilitated the whole equipment in digital control and operation.
Keywords :
acoustoelectric transducers; microcontrollers; ultrasonic transducers; DDS technology; MCU; adjustable repetition frequency; electric magnetic acoustic transducers; electric power source; electric-acoustic transformation; electrical power source; electromagnetic ultrasound; excitation time delay; impedance match circuit; microcontroller unit; power amplifier; pulse frequency; Acoustics; Electromagnetics; Electron tubes; Frequency control; Impedance; Microcomputers; Time-frequency analysis; DDS technology; EMAT; Impedance match circuit; Narrow pulses;
Conference_Titel :
Control and Decision Conference (CCDC), 2015 27th Chinese
Conference_Location :
Qingdao
Print_ISBN :
978-1-4799-7016-2
DOI :
10.1109/CCDC.2015.7162683
