Lock-in amplifier with phase-synchronous processing

摘要

The presented device is the combination of a lock-in amplifier unit (1) and a phase-synchronous processing unit (2). This combination leads to a multitude of valuable signal analysis and conditioning possibilities. Amongst others, these possibilities include (i) extraction of time-domain properties of the input signal, (ii) extraction of statistical properties of the input signal, (iii) extraction of frequency-domain properties of the input signal, and (iv) preconditioning of the lock-in input signal.

主权项

1. A lock-in amplifier comprising
an LIA unit having
a signal input for receiving an input signal s(t),a reference signal generator providing a periodic reference signal,a demodulator generating an unfiltered LIA-signal by multiplying said input signal and said reference signal,a low-pass filter connected to said demodulator and filtering said unfiltered LIA-signal for generating a filtered LIA output signal, and a PSP unit having
a value-phase association unit adapted to associate values of said input signal to a phase of said reference signal and to thereby generate phase-associated signal values, anda signal processor connected to said value-phase association unit and calculating at least one function of said phase-associated signal values for generating a PSP output signal.