Measuring and testing – Barometer
Patent
1985-03-25
1986-07-01
Woodiel, Donald O.
Measuring and testing
Barometer
73703, 73DIG4, 310318, 310338, G01L 900
Patent
active
045972885
ABSTRACT:
The present invention provides a barometer which includes a frequency control circuit connected to the input of the piezoelectric oscillator, a current-voltage converter connected to the output of the piezoelectric oscillator, a phase comparator connected to the output of the frequency control circuit and to the output of the current-voltage converter, a voltmeter connected to the current-voltage converter, a voltmeter connected to the phase comparator, a low-pass filter connected to the phase comparator, and input means for applying the output of the low-pass filter to the frequency control circuit. In the construction described above, the ambient pressure of the gas around the piezoelectric oscillator is represented by the a.c. voltage value of the piezoelectric oscillator.
REFERENCES:
patent: 3541849 (1970-11-01), Corbett
patent: 4490606 (1984-12-01), Lockett et al.
Review of Scientific Instruments, vol. 33, No. 1, Jan. 1962, pp. 47-49.
Kyogoku Hideaki
Tamura Fujio
Adams Bruce L.
Burns Robert E.
Lobato Emmanuel J.
Seiko Instruments & Electronics Ltd.
Woodiel Donald O.
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