Method and apparatus for spectral analysis of a signal at a meas

Details Method and apparatus for spectral analysis of a signal at a meas Method and apparatus for spectral analysis of a signal at a meas

1985-03-28

1987-07-07

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

324 73PC, 324 79R, G01R 3128

Patent

active

046789880

ABSTRACT:
With the method and apparatus for the detection and/or imaging of a measuring point which carries a voltage at least of a specific frequency, wherein, in a scanning particle or radiation microscope, a voltage contrast signal is further processed into a measuring signal by a lock-in amplifier, a spectral analysis of a voltage carried at the measuring point is possible even when one or more frequencies from the spectrum of this signal are unknown. A reference signal is supplied to the lock-in amplifier at a frequency fb which is varied over a frequency range. A signal regarding the magnitude of the frequency fb of the reference signal is transmitted to a device for the recording of the measuring signal so that the measuring signal can be indicated in dependence upon the frequency fb of the reference signal.

REFERENCES:
patent: 2507525 (1950-05-01), Hurvitz
patent: 4292519 (1981-09-01), Feuerbaum

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