Lock-in amplifiers

Details Lock-in amplifiers Lock-in amplifiers

G - Physics

01

R

330/13

G01R 25/00 (2006.01) G01R 35/00 (2006.01)

Patent

CA 1211802

ABSTRACT OF THE DISCLOSURE A lock-in amplifier includes a phase-sensitive detector having a signal input and a reference input. The output signal from detector is compensated for offset errors which are dependent on the frequency of the reference input and on ambient temperature changes by having a correction signal added to it in an adder. Changes in gain are compensated for by the addition of a compensation signal in an adder. Phase errors are compensated by providing a phase shifter for the reference input. The dc correction, gain compensation and phase correction signals are obtained from a controller which provides digital signals the values of which are derived from a memory, a temperature transducer and a reference input frequency meter.

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