Ionization contact potential difference gyroscope

• US 6,679,117 B2
• Filed: 02/07/2001
• Issued: 01/20/2004
• Est. Priority Date: 02/07/2001
• Status: Active Grant

• Current Assignee: Georgia Tech Research Corporation (University System of Georgia)
• Original Assignee: Georgia Tech Research Corporation (University System of Georgia)
• Inventors: Danyluk, Steven, Schmidt, Parbury P Jr., Zharin, Anatoly
• Primary Examiner(s): CHAPMAN JR, JOHN E
• Application Number:
  US09/778,491
• Publication Number:
  US 20020104376A1
• Time in Patent Office: 1,077 Days
• Field of Search: 735/140.9, 735/140.3, 735/040.5, 735/040.7, 735/040.6, 735/040.1, 735/141.9, 735/142.5
• US Class Current: 73/514.25
• CPC Class Codes: G01C 19/58 Turn-sensitive devices without moving masses
• CPC Class Codes: G01P 15/08 with conversion into electric or magnetic values

Abstract

An ionization contact potential difference gyroscope including a housing enclosing a first and second electrode with a gas, further including an ionization source capable of providing ions from the gas, and a contact potential difference measurement circuit that is capable of measuring an electrical signal related to the amount of ions striking at least one of the two surfaces. The measurement circuit of the present invention is capable of sensing the small amount of electrical current flowing as the electrons and ions strike one or both of the surfaces.

Claims

1. A gyroscopic device comprising first and second surfaces being in electrical communication, said first and second surfaces having different work functions and being separated from one another by a space, and a potential difference measurement circuit for measuring a differential current related to a contact potential difference between said first and second surfaces, wherein ionized gas is in the space between said first and second surfaces, and the device and the accompanying gas are moved by the means for imparting motion and wherein the differential current arises from relative motion of the gas between the first and second surfaces created at least in part by motion of the device.

2. The gyroscopic device of claim 1, said first surface being a first conductive material.

3. The gyroscopic device of claim 1, said first surface fixedly separated from said second surface.

4. The gyroscopic device of claim 1 comprising three sets of said first and second surfaces, each said set of first and second surfaces forming a pair of first and second surfaces both positioned in parallel planes, each said pair of first and second surfaces being in a perpendicular plane relative to each other said pair of first and second surfaces.

5. The gyroscopic device of claim 1 further comprising an ionization source for forming the ionized gas in the space between said first and second surfaces.

6. The gyroscopic device of claim 5, said first surface being a first conductive material, said second surface being a second conductive material and said ionization source being a radioisotope.

7. The gyroscope device of claim 1 further comprising a housing enclosing said first and second surfaces and the ionized gas.

8. The gyroscopic device of claim 7, said housing hermitically sealing said first and second surfaces and the ionized gas.

9. A gyroscope device comprising a hermetic housing enclosing a gas and a pair of electrodes being electrically connected and separated by a space, a contact potential difference being established between the electrodes and the contact potential difference creating an electric field in proximity to said electrodes, a radioisotope for ionizing a portion of the gas, and the potential difference measurement circuit for measuring a differential current related to the electric field and the differential current arising from relative motion between the ionized gas and the pair of electrodes.

10. The gyroscope of claim 9, the gas made up of heavy molecules that are polarizable.

11. A method of sensing motion of a mobile object comprising the steps of providing the mobile object with two surfaces, each of the surfaces being of different work function separated by a space, providing ions in the space, thereby establishing a contact potential difference between the two surfaces with a differential current being capable of flowing between the two surfaces across the space, the differential current being related to the motion of the ions relative to the two surfaces of the mobile object, measuring the differential current, and determining the motion of the mobile object from variations in the differential current.

12. The method of sensing motion according to claim 11, said two surfaces and the ions being hermetically sealed within a housing.

13. A method of sensing motion of a mobile object comprising the steps of providing a device having at least three surfaces with each surface having a work function and the surfaces having at least two different work functions, thereby forming a contact potential difference across a space, providing ions disposed in the space, measuring a differential current related to changes in the relative motion of the ions contacting the surfaces and determining the motion of the mobile object from variations in the differential current.