Pressure responsive apparatus
AssigneeBell & Howell Company
InventorReginald Catherall
Life of this patent
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Abstract
Apparatus responsive to the pressure of a fluid contained in or surrounding a stiff but resilient hollow body comprises a stiff, but resilient ring mounted concentric with the body by means of four equi-spaced radially extending stiff struts. Electromagnetic means is provided for exciting natural vibrations of the ring at a resonance frequency, which will be dependent upon the pressure of the fluid in the body. Means is provided for measuring the frequency of vibration, enabling the pressure of the fluid to be determined, e.g. from a pressure-frequency calibration curve for the apparatus.
Claims27
Apparatus responsive to the pressure of a fluid contained in or surrounding a stiff but resilient hollow body, comprising a stiff but resilient ring, 2n (where n is an integer greater than 1) equi-spaced radially extending struts connected between a periphery of said ring and a peripheral surface of said body to support said ring concentrically with said body, means for exciting natural vibrations of said ring at a resonance frequency and means for providing a signal representative of the frequency of said vibrations.
Dependencies are inferred from the claim text.