Communications: electrical – Digital comparator systems
Patent
1973-06-14
1976-05-11
Habecker, Thomas B.
Communications: electrical
Digital comparator systems
340211, 340282, 23515132, G08C 1908
Patent
active
039567419
ABSTRACT:
Disclosed is a unique probe and amplifier circuit for use with a digital height gauge or other measuring device. Fundamentally, the invention utilizes a probe tip operatively connected to the primary and secondary windings of an LVDT; the core of the LVDT being fixedly positioned between the windings. Deflection of the probe in either direction along the axis of the core results in an output signal from the LVDT, the amplitude of the signal being indicative of the magnitude of the deflection. The signal is translated into a varying DC level, the value of the DC level being linearly related to the deflection of the probe. The DC voltage is applied to an operational amplifier having selective feedback networks associated therewith which prescribe the gain of the amplifier and hence its subsequent effect upon a calibrated meter connected to the output thereof. The meter provides visual readings indicative of the deflection of the probe. The operational amplifier has a DC bias associated therewith to compensate for the diameter of the probe tip such that measurements may be taken in a bi-directional manner without compensation having to be made for the probe tip diameter. Also connected to the output of the operational amplifier is circuitry for producing a binary state DC signal at that time at which the meter indicates that a measurement should be taken.
REFERENCES:
patent: 2627119 (1953-02-01), Graham
patent: 3142794 (1964-07-01), Pegram
patent: 3184858 (1965-05-01), Shaper
patent: 3212324 (1965-10-01), Martin
patent: 3354399 (1967-11-01), Houpt
patent: 3456132 (1969-07-01), Dechelotte
patent: 3569820 (1971-03-01), Nishimuta
patent: 3668701 (1972-06-01), Mayberry
patent: 3670318 (1972-06-01), Fathauer
patent: 3683344 (1972-08-01), Saito
patent: 3684961 (1972-08-01), Muir
Habecker Thomas B.
Kraus Instruments, Inc.
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