Electricity: measuring and testing – Electrical speed measuring – Speed comparing means
Patent
1981-05-29
1982-07-27
Krawczewicz, Stanley T.
Electricity: measuring and testing
Electrical speed measuring
Speed comparing means
328134, G01P 356
Patent
active
043419950
ABSTRACT:
A velocity profile analyzing device measures the change or non-linearity in the velocity of a system under test, and digitally displays the measured variation. The principle of operation is to determine any velocity differences that occur in relation to an ideal state, and to present via a digital display the difference value. The system derives from a linear encoder a velocity representative signal, which includes a grating output coupled to a first counter, and an index output for simultaneously starting the first counter and a second counter coupled to receive a reference frequency signal. The counter outputs are fed to a digital subtractor which provides a digital difference frequency signal for digital display and recording. The digital display may be scaled to directly indicate velocity difference, which can be analyzed for various cyclic or other perturbations without accommodating the whole range of deviation. This provides simple instrumentation, and both instantaneous and permanent displays of the velocity variations.
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American Optical Corporation
Krawczewicz Stanley T.
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