Measuring and testing – Speed – velocity – or acceleration – Acceleration determination utilizing inertial element
Patent
1994-11-30
1996-04-23
Williams, Hezron E.
Measuring and testing
Speed, velocity, or acceleration
Acceleration determination utilizing inertial element
7351425, G01P 1500
Patent
active
055093094
ABSTRACT:
An acceleration measuring device consists of a sealed-off, diode vacuum tube which in turn contains a cold cathode and an anode positioned at opposing longitudinal end regions of the vacuum tube via an inter-electrode space C. An inert argon gas is sealed in the vacuum tube at the pressure of 1 mm Hg. Because the acceleration measuring device utilizes field effect electron emission phenomenon, i.e., quantum mechanical tunneling by the Schottky effect, from the cold cathode, one obtains electron-emission characteristics which are essentially temperature independent. The vacuum tube also includes one or more areas connected to the inter-electrode space, local density of the gas in which connected areas changes in response to acceleration experienced by the acceleration measuring device, whereby the density of the gas in the inter-electrode space is altered. Since the density of the gas in the inter-electrode space between the mutually opposing electrodes corresponds essentially linearly to the impedance against the electron flow towards the anode, the anode current is inversely proportional to the density of the gas in the inter-electrode space. The magnitude of the acceleration is measured by detecting the variation of the anode current.
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Amano Akira
Matsuzaki Kazuo
Yokoyama Shotaro
Fuji Electric & Co., Ltd.
Moller Richard A.
Williams Hezron E.
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