Parallel T impedance measurement circuit for use with variable i

Measuring and testing – Fluid pressure gauge – Diaphragm

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

324 57Q, 324 60C, 331 65, 331142, G01L 912

Patent

active

043911463

ABSTRACT:
A circuit for measuring a parameter to be sensed by means of at least one variable impedance sensor responsive to such parameter. The circuit includes a frequency determining means coupled to the variable sensor for providing an oscillatory frequency signal responsive to the impedance of the sensor, a signal amplifier coupled to the frequency determining means for amplifying the frequency signal to provide an output signal representative of the frequency signal and to sustain circuit oscillation, a signal detector coupled to the output signal to provide a control signal representative of such output signal, and a control coupled to receive the control signal and coupled to the frequency determining means thus allowing the oscillatory frequency signal of the circuit to oscillate at a frequency representative of the measured parameter.

REFERENCES:
patent: 2106785 (1938-02-01), Augustadt
patent: 2173427 (1939-09-01), Scott
patent: 2319965 (1943-05-01), Wise
patent: 2341067 (1944-02-01), Wise
patent: 2423505 (1947-07-01), Landon
patent: 2439245 (1948-04-01), Dunn
patent: 2441567 (1948-05-01), Darlington
patent: 2466904 (1949-04-01), Lundstrom
patent: 2506723 (1947-12-01), Larsen
patent: 2568868 (1951-09-01), Pratt
patent: 2586167 (1952-02-01), Kamm
patent: 2827569 (1958-03-01), Jessen et al.
patent: 2927282 (1960-03-01), Gardberg
patent: 2963642 (1960-12-01), Arbogast et al.
patent: 3012192 (1961-12-01), Lion
patent: 3049675 (1962-08-01), Favin
patent: 3120633 (1964-02-01), Bradford
patent: 3209283 (1965-09-01), Clapper
patent: 3317854 (1967-05-01), Liska et al.
patent: 3445835 (1969-05-01), Fudaley
patent: 3446075 (1969-05-01), Hecht
patent: 3535430 (1970-10-01), Maynard
patent: 3555448 (1971-01-01), Clarke et al.
patent: 3639832 (1972-02-01), Goebbels
patent: 3671857 (1972-06-01), Bergmanis et al.
patent: 3746975 (1973-07-01), Maltby
patent: 3793585 (1974-02-01), Wilska
patent: 3793596 (1974-02-01), Grundy
patent: 3800242 (1974-03-01), Zimmerman et al.
patent: 3815050 (1974-06-01), Cowpland
patent: 3859575 (1975-01-01), Lee et al.
patent: 4006430 (1977-02-01), Meyer-Ebrecht
patent: 4091683 (1978-05-01), Delatorre
patent: 4136315 (1979-01-01), Kuhn
Howard V. Malmstadt et al., Optimization of Electronic Measurements, 1974 pp. 47-63.
A. P. Bolle, "Theory of Twin-T RC-Networks and their Application to Oscillators," 1953, Journal of the British Institution of Radio Engineers, pp. 571-587.
Laurence G. Cowles, "The Parallel-T Resistance-Capacitance Network", 1956, Proceedings of the I.R.E., pp. 1712-1717.
A. E. Hastings, "Analysis of a Resistance-Capacitance Parallel-T Network and Applications", Proceedings of the I.R.E. and Wages and Electrons, Mar. 1946, pp. 126-129.
P. M. Honnell, "Bridged-T Measurement of High Resistances at Radio Frequencies", Proceedings of the I.R.E., Feb. 1940, pp. 88-90.
W. G. Sheppard, "Variable-Frequency Bridge-Type Frequency-Stablished Oscillators", Proceedings of the I.R.E., Jun. 1943, pp. 256-268.
Leonard Stanton, "Theory and Application of Parallel-T Resistance-Capacitance Frequency-Selective Networks", Proceedings of the I.R.E. and Waves and Electrons, Jul. 1946, pp. 447-456.
W. N. Tuttle, "Bridged-T and Parallel-T Null Circuits for Measurements at Radio Frequencies", Proceedings of the I.R.E., Jan. 1940, pp. 23-29.
N. Boutin et al., "The Misunderstood Twin-T Oscillator", IEEE Circuits and Systems Magazine, Dec. 1980, pp. 8-13.
H. H. Scott, "A New Type of Selective Circuit and Some Applications", Proceedings of the I.R.E., Feb. 1938, pp. 226-235.
Lion Research Corporation, "C-Line Precision Pressure Transducer Model PPT 811", two pages, undated.
Kurt S. Lion et al., "Nonlinear Twin-T Network for Capacitive Transducers", Reprinted from The Review of Scientific Instruments, vol. 35, Mar. 1964. pp. 353-356.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Parallel T impedance measurement circuit for use with variable i does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Parallel T impedance measurement circuit for use with variable i, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Parallel T impedance measurement circuit for use with variable i will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1434467

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.