TAILIEUCHUNG - Báo cáo " Implementation of the digital phase-sensitive system for low signal measurement "

In this paper we present the implementation of a digital lock-in amplifier (LIA) completely based on Labview with a general-purpose data acquisition board (or a high quality sound card) and a high-gain low-noise amplifier. The signal analysis is processed by the software. We describe some characteristics of the LIA including output voltage vs. frequency and output phase vs. noise. The LIA can be used to measure the small signals, even in presence of broadband noise which is several times greater than the signal itself. Since the signal processing takes place on the computer, . | VNU Journal of Science Mathematics - Physics 24 2008 239-244 Implementation of the digital phase-sensitive system for low signal measurement Pham Quoc Trieu Nguyen Anh Duc Department of Physics College of Science VNU 334 Nguyen Trai Thanh Xuan Hanoi Vietnam Received 17 October 2008 received in revised form 2 December 2008 Abstract. In this paper we present the implementation of a digital lock-in amplifier LIA completely based on Labview with a general-purpose data acquisition board or a high quality sound card and a high-gain low-noise amplifier. The signal analysis is processed by the software. We describe some characteristics of the LIA including output voltage vs. frequency and output phase vs. noise. The LIA can be used to measure the small signals even in presence of broadband noise which is several times greater than the signal itself. Since the signal processing takes place on the computer the ones can display the waveform - as a time series or power spectrum - as it progresses through the instrument which makes it an excellent tool for the senior-level physics lab. Keywords low signal implementation digital. 1. Introduction Low-level signal processing is of practical importance in various aspects but it is usually coupled with difficulties. As the state of the instrument undergoes changes with temperature and time the measurement results fluctuates. The low-level signal is characterized by the low signal-to-noise ratio SNR . The common sources of noise include the 50 60 Hz noise from the power network the 1 f noise from the pre-amplifiers thermal noise and leakage current noise from sensors. or a combination of them. Those kinds of noises are always present and effect the measurement equipment 1 . The lock-in amplifier uses the phase-sensitive detection PSD which filters off all signal parts having different frequencies than the nominal frequency so does not effect the measurement. The PSD equipment not only can detect the amplitude of a signal having the .

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