Patent ID: 11946949
Assignee: TECHNISCHE UNIVERSITäT WIEN
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 13:
14. The method according to claim 13,
wherein the phase-shifted demodulation signal is identical to the demodulation signal except for the defined known phase shift,
wherein the filtered difference signal and the filtered phase-shifted difference signal are processed by a signal processing unit in order to calculate an output amplitude and/or an output phase,
wherein the output amplitude is calculated according to

Aout=((DIFFS_f)2+(DIFFS_Q_f)2)1/2 

and/or the output phase is calculated according to

ϕout=atan(DIFFS_Q_f/DIFFS_f),

wherein Aout is the output amplitude, DIFFS_f is the filtered difference signal, DIFFS_Q_f is the filtered phase-shifted difference signal, ϕout is the output phase, and atan is the arc tangent.