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US 12,736,471 B2Granted
Optical sensor and physical quantity measurement device having a sensor head firmly bonded to a base
AssigneeNagano Keiki Co., Ltd.
InventorsAyumu Sakamoto, Keiichi Fujita, Tsutomu Yamate
Life of this patent
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Abstract
An optical sensor includes: a metal base formed into a cylindrical shape; an optical fiber member inserted into the base; and a sensor head that is bonded to the base and is optically connected to the optical fiber member, the sensor head including a head portion formed from monocrystalline alumina, in which the base includes a fitting portion into which the sensor head is inserted, and the sensor head is bonded to the fitting portion via a bonding member.
Claims9
An optical sensor, comprising:
- a metal base formed into a cylindrical shape;
- an optical waveguide inserted into the base;
- and
- a sensor head that is bonded to the base and is optically connected to the optical waveguide, the sensor head comprising a distal head formed from monocrystalline alumina,
- wherein the base comprises a fitting, said fitting having a cylindrical shape into which the sensor head is inserted,
- the sensor head is formed from monocrystalline alumina and comprises a proximal end formed into a columnar shape, the proximal end of the sensor head being inserted into the fitting, and
- a circumferential surface of the proximal end of the sensor head is bonded to the fitting, and the distal head of the sensor head is not inserted into the fitting and projects outwardly away from the fitting.
4 more elements
A physical quantity measuring device, comprising:
- a light source;
- an optical sensor comprising:
- a metal base formed into a cylindrical shape;
- an optical waveguide that is optically connected to the light source and is inserted into the base;
- and a sensor head that is bonded to an end of the base and is optically connected to the optical waveguide, the sensor head comprising a distal head formed from monocrystalline alumina;
- a light detector configured to detect an interference signal from interference light output from the optical sensor;
- and
- an arithmetic unit configured to calculate a physical quantity of a target fluid from the interference signal detected by the light detector, the arithmetic unit being configured as a Micro Processing Unit,
- wherein the base comprises a fitting formed into a cylindrical shape into which the sensor head is inserted,
- the sensor head is formed from monocrystalline alumina and comprises a proximal end formed into a columnar shape, the proximal end of the sensor head being inserted into the fitting, and
- a circumferential surface of the proximal end of the sensor head is bonded to the fitting, and the distal head of the sensor head is not inserted into the fitting and projects outwardly away from the fitting.
8 more elements
Dependencies are inferred from the claim text.