Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1988-09-16
1990-10-30
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324158T, G01R 2500, G01R 3126
Patent
active
049671502
ABSTRACT:
In the method and apparatus for the phase measurement of arbitrary signals at a measuring point, for example, of surface waves on piezoelectrical substrates, the surface waves are excited on the surface of a specimen having piezoelectrical features. The measuring point on the specimen surface is scanned by a particle beam and a secondary electrical signal at the measuring point is supplied to an evaluation circuit via a detector. A phase detector within the evaluation circuit is operated in a linear region of its output characteristic curve with the use of a feedback. This makes it possible to keep the phase at the phase detector constant. The phase of the signal to be examined, for example, of the surface wave, which is produced at a interdigital transducer is influenced due to the feedback.
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Burns W.
Eisenzopf Reinhard J.
Siemens Aktiengesellschaft
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