Capacitance temperature sensor and temperature measuring device

• US 7,134,785 B2
• Filed: 04/26/2005
• Issued: 11/14/2006
• Est. Priority Date: 04/27/2004
• Status: Active Grant

• Current Assignee: National Institute of Advanced Industrial Science and Technology (Government of Japan)
• Original Assignee: National Institute of Advanced Industrial Science and Technology (Government of Japan)
• Inventors: Shoji, Akira, Wang, Ruiping, Itoh, Mitsuru, Shirakawa, Naoki, Takashima, Hiroshi
• Primary Examiner(s): KAPLAN VERBITSKY, GAIL
• Application Number:
  US11/114,110
• Publication Number:
  US 20050238081A1
• Time in Patent Office: 567 Days
• Field of Search: 374/184, 374/182, 257/306, 361/282, 361/244.1, 361/271, 361/276
• US Class Current: 374/184
• CPC Class Codes: G01K 7/006 using superconductive elements
• CPC Class Codes: G01K 7/343 the dielectric constant of which is temperature dependant

Abstract

A capacitance temperature sensor in which temperature is measured by detecting capacitance of a parallel plate condenser which comprises a dielectric material comprising strontium titanate single crystal in which (a) 30% by weight or less of oxygen-16 or (b) 30% by weight to 50% by weight of oxygen-16 is substituted with oxygen-18 isotope.

Claims

1. A capacitance temperature sensor in which temperature is measured by detecting capacitance of a parallel plate condenser which comprises a dielectric material comprising strontium titanate single crystal in which 30% by weight or less of oxygen-16 is substituted with oxygen-18 isotope.

3. A temperature measuring device which comprises the capacitance temperature sensor according to claim 1, a meter for measuring capacitance of the capacitance temperature sensor, and an apparatus for determining the temperature from the measured capacitance.

4. The temperature measuring device according to claim 3, wherein the meter is a capacitance bridge.

5. The temperature measuring device according to claim 3, wherein the temperature is measured in the magnetic field.

2. A capacitance temperature sensor in which temperature is measured by detecting capacitance of a parallel plate condenser which comprises a dielectric material comprising strontium titanate single crystal in which 30% by weight to 50% by weight of oxygen-16 is substituted with oxygen-18 isotope.

6. A temperature measuring device which comprises the capacitance temperature sensor according to claim 2, a meter for measuring capacitance of the capacitance temperature sensor, and an apparatus for determining the temperature from the measured capacitance.

7. The temperature measuring device according to claim 6, wherein the meter is a capacitance bridge.

8. The temperature measuring device according to claim 6, wherein the temperature is measured in the magnetic field.