Sapphire sensor for measuring pressure and temperature
First Claim
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1. A sensor apparatus for measuring a pressure, a temperature, or both, the sensor comprising:
- a diaphragm configured to respond to a change in temperature or pressure, the diaphragm comprising at least one sapphire element;
a base comprising at least one sapphire element;
a cavity defined between the diaphragm and the base by a sapphire spacer having a closed geometric shape and a thickness which is large relative to a thickness of said diaphragm, said diaphragm, said base and said sapphire spacer being bonded together; and
an optical fiber that is configured to conduct light reflected off boundaries of said cavity while reducing reflection from an end surface of said optical fiber.
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Abstract
A sensor for measuring pressure, temperature or both may be provided. The sensor may include a diaphragm that may respond to a change in temperature or pressure, a base connected to the diaphragm, a cavity, and an optical fiber that may conduct light reflected off of a surface of the diaphragm. The diaphragm and base may be sapphire elements. An interrogator may be provided for detecting a deflection of the diaphragm.
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Citations
44 Claims
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1. A sensor apparatus for measuring a pressure, a temperature, or both, the sensor comprising:
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a diaphragm configured to respond to a change in temperature or pressure, the diaphragm comprising at least one sapphire element; a base comprising at least one sapphire element; a cavity defined between the diaphragm and the base by a sapphire spacer having a closed geometric shape and a thickness which is large relative to a thickness of said diaphragm, said diaphragm, said base and said sapphire spacer being bonded together; and an optical fiber that is configured to conduct light reflected off boundaries of said cavity while reducing reflection from an end surface of said optical fiber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A system for measuring a pressure, a temperature, or both, the system comprising:
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a diaphragm configured to respond to a change in temperature or pressure, the diaphragm comprising at least one sapphire element; a base comprising at least one sapphire element; a cavity defined between the diaphragm and the base by a sapphire spacer having a closed geometric shape and a thickness which is large relative to a thickness of said diaphragm, said diaphragm, said base and said sapphire spacer being bonded together; an optical fiber that is configured to conduct light reflected off of a surface of the diaphragm and a boundary of said cavity; and an interrogator for detecting a deflection and an OPD of the diaphragm, or the base, respectively. - View Dependent Claims (33, 34, 35, 36, 37, 38)
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39. A sensor apparatus for measuring a pressure, a temperature, or both, the sensor comprising:
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a diaphragm configured to respond to a change in temperature or pressure, the diaphragm comprising at least one sapphire element; a base connected to the diaphragm, the base comprising at least one sapphire element; a cavity defined between the diaphragm and the optical fiber by a sapphire spacer having a thickness which is large relative to a thickness of said diaphragm, and an optical fiber configured to conduct light reflected off a surface of said diaphragm or boundary of said cavity. - View Dependent Claims (40, 41, 42, 43, 44)
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Specification