Speaker
Description
Jinda Sinlapanuntakul, Puchong Kijamnartsuk, Chanthawut Jetjamnong, S. Chotikaprakhan
Department of Physics, Faculty of Science, Kasetsart University, Bangkok, 10900 Thailand.
Keywords: Digital lock-in amplifier, RLC circuit, Physics laboratory.
The purpose of this paper is to develop a digital lock-in amplifier based on soundcard interface for undergraduate physics laboratory. Both series and parallel RLC circuit laboratory are tested because of its well-known, easy to understand and simple confirm. The sinusoidal signal at the frequency of 10 Hz – 15 kHz is generated to the circuits. The amplitude and phase of the voltage drop across the resistor, R are measured in 10 step decade. The signals from soundcard interface and lock-in amplifier are compared. The results give a good correlation. It indicates that the design digital lock-in amplifier is promising for undergraduate physic laboratory.
[1] Tepelea L, Gavrilut I, Neamtu O, Gergely E, Gacsadi A, 17th “Building Services, Machanical and Building Industry Days” International Conference, 13-14 Oct. 2011, Debrecen Hungry.
[2] Ye B, Chen F, Li M, Int. J. of Signal Processing, Image Processing and Pattern Recognition 8(4), 361 (2015).
