Title :
The rail length measurement circuit design based on the lock-in amplifier technology
Author :
Liu Bo ; Shao Mingxin ; Chen Yue
Author_Institution :
Higher Educ. Key Lab. for Meas. & Control Technol. & Instrumentations of Heilongjiang Province, Harbin Univ. of Sci. & Technol., Harbin, China
fDate :
June 28 2013-July 1 2013
Abstract :
The paper studied the rail length measurement method, analyzed the sound waves attenuation in rails. The sound wave attenuated severely after traveling through the rail, so adopted the signal correlation principle of the lock-in amplifier to detect weak signal. Then completed the circuit design such as the acoustic emission circuit, the preamplifier circuit, the signal operation circuit of the digital lock-in amplifier and so on. The lock-in amplifier did correlation operation between the signals and completed the reference signal phase shift function by DSP and at last, detected the weak signals in noises.
Keywords :
acoustic emission; acoustic wave propagation; amplifiers; length measurement; network synthesis; rails; DSP; acoustic emission circuit; lock-in amplifier technology; preamplifier circuit; rail length measurement circuit design; reference signal phase shift function; signal correlation principle; signal operation circuit; sound wave attenuation; weak signals; Attenuation measurement; Circuit synthesis; Field effect transistors; Length measurement; Probes; Rails; Random access memory; weak signal length measurement lock-in amplifier;
Conference_Titel :
Strategic Technology (IFOST), 2013 8th International Forum on
Conference_Location :
Ulaanbaatar
Print_ISBN :
978-1-4799-0931-5
DOI :
10.1109/IFOST.2013.6616986
