Simple synchronic detection at audio frequencies through a PC sound card

González, Martín G.; Santiago, Guillermo D.; Slezak, Verónica B.; Peuriot, Alejandro L.
May 2007
Review of Scientific Instruments;May2007, Vol. 78 Issue 5, p055108
Academic Journal
We present a simple personal computer based, synchronic detection system that emulates a lock-in amplifier at audio frequencies. The inputs of the sound card are used to acquire two sets of samples: the one to be measured, previously preamplified, and the reference. From the last one, two “quasiorthogonal” signals are derived to perform dual-phase detection. The procedure is fast and compares favorably with a benchtop lock-in amplifier. In the band from 100 Hz to 20 kHz we obtained average amplitude and phase errors below 1% and 0.1°, respectively.


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