US4906106A
Expired / Lapsed
US
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Pyrometric temperature measuring instrument
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1988-11-02
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Granted: 1990-03-06
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Expires: 2008-11-02
Abstract
Abstract A pyrometric temperature measuring instrument including at least one optical wave guide (1a) with a core (5) and a cladding (6), a light detector (3) and at least one pyrometric sensor (2a). The at least one optical wave guide (1a) has a large numerical aperture. The pyrometric sensor (2a) is located at one end of the at least one optical wave guide (1a) and covers at least a cross-section of the core (5) of an optical wave guide (1a). In a preferred embodiment, the light detector (3) is an InGaAs photodiode. The optical wave guide (1a) has a numerical aperture of 0.3 or more, a diameter of the core (5) of approximately 100 μm or more, and is surrounded by a light-tight cover (7).
Inventors
- 👤 Meinolph Kaufmann
- 👤 Lothar Schultheis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:03
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/60; G01J5/602; G01J5/02; G01J5/08; G01J5/0818; G01J5/0821; G01J5/0887; G01J5/04; G01J5/048
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
125 words
Pyrometric temperature measuring instrument comprising: at least one optical waveguide having a core and a cladding; at least one pyrometric sensor provided at one end of said at least one optical waveguide; and a liquid detector; wherein: said optical waveguide is a plastic clad silica (PCS) fiber, the core of which has a diameter of more than approximately 100 μm and wherein the optical waveguide has a numerical aperture of more than approximately 0.3; said pyrometric sensor is a black layer covering at least a cross-section of the core at an end of the optical waveguide and possessing the properties of a black body at least in a wavelength region detectable by the liquid detector; said light detector comprises a Indium, Galium, Arsenic (InGaAs) photodiode.
Claim 2
Dependent Claim
125 words
Pyrometric temperature measuring instrument comprising: at least one optical waveguide having a core and a cladding; at least one pyrometric sensor provided at one end of said at least one optical waveguide; and a liquid detector; wherein: said optical waveguide is a plastic clad silica (PCS) fiber, the core of which has a diameter of more than approximately 100 μm and wherein the optical waveguide has a numerical aperture of more than approximately 0.3; said pyrometric sensor is a black layer covering at least a cross-section of the core at an end of the optical waveguide and possessing the properties of a black body at least in a wavelength region detectable by the liquid detector; said light detector comprises a Indium, Galium, Arsenic (InGaAs) photodiode.
Claim 3
Dependent Claim
139 words
Pyrometric temperature measuring instrument comprising: at least one optical waveguide having a core and a cladding; at least one pyrometric sensor provided at one end of said at least one optical waveguide; and a light detector; wherein: said optical waveguide is a plastic clad Silica (PCS) fiber surrounded by a light-tight cover, the core of which has a diameter of more the approximately 100 μm, and wherein the optical waveguide has a numerical aperture of more than approximately 0.3; said pyrometric sensor is a black layer covering at least a cross-section of the core at an end of the optical waveguide and possessing the properties of a black body at least in a wavelength region detectable by the light detector; said light detector is cooled and comprises an InGaAs photodiode and means for cooling said light detector are provided.
Claim 4
Dependent Claim
139 words
Pyrometric temperature measuring instrument comprising: at least one optical waveguide having a core and a cladding; at least one pyrometric sensor provided at one end of said at least one optical waveguide; and a light detector; wherein: said optical waveguide is a plastic clad Silica (PCS) fiber surrounded by a light-tight cover, the core of which has a diameter of more the approximately 100 μm, and wherein the optical waveguide has a numerical aperture of more than approximately 0.3; said pyrometric sensor is a black layer covering at least a cross-section of the core at an end of the optical waveguide and possessing the properties of a black body at least in a wavelength region detectable by the light detector; said light detector is cooled and comprises an InGaAs photodiode and means for cooling said light detector are provided.
Claim 5
Dependent Claim
159 words
Pyrometric temperature measuring instrument comprising: at least one optical waveguide having a core and a cladding; at least one pyrometric sensor provided at one end of said at least one optical waveguide; and a light detector; wherein: said optical waveguide is a plastic clad silica (PCS) fiber, the core of which has a diameter of more the approximately 100 μm, and wherein the optical waveguide has a numerical aperture of more than approximately 0.3; said pyrometric sensor is a black layer covering at least a cross-section of the core at an end of the optical waveguide and possessing the properties of a black body at least in a wavelength region detectable by the light detector; said light detector comprises at least two Indium, Galium, Arsenic (InGaAs) photodiodes, by which to determine a temperature light intensities are measured in the light detector in two different wavelength regions and a temperature is derived from a ratio of the two measured intensities.
Claim 6
Dependent Claim
159 words
Pyrometric temperature measuring instrument comprising: at least one optical waveguide having a core and a cladding; at least one pyrometric sensor provided at one end of said at least one optical waveguide; and a light detector; wherein: said optical waveguide is a plastic clad silica (PCS) fiber, the core of which has a diameter of more the approximately 100 μm, and wherein the optical waveguide has a numerical aperture of more than approximately 0.3; said pyrometric sensor is a black layer covering at least a cross-section of the core at an end of the optical waveguide and possessing the properties of a black body at least in a wavelength region detectable by the light detector; said light detector comprises at least two Indium, Galium, Arsenic (InGaAs) photodiodes, by which to determine a temperature light intensities are measured in the light detector in two different wavelength regions and a temperature is derived from a ratio of the two measured intensities.
Claim 7
Dependent Claim
15 words
Pyrometric temperature measuring instrument according to claim 3, comprising: means for cooling the light detector.
Claim 8
Dependent Claim
28 words
Pyrometric temperature measuring instrument according to one of claims 1, 2, or 3, wherein the black layer is a mixture of finely dispersed carbon and a silicon adhesive.
Claim 9
Dependent Claim
120 words
Pyrometric temperature measuring instrument comprising: at least one optical waveguide having a core and a cladding; at least one pyrometric sensor provided at one end of said at least one optical waveguide; and a light detector; wherein: said optical waveguide has a core of a diameter of more than approximately 100 μm and numerical aperture of more than approximately 0.3; said optical waveguide and the pyrometric sensor are integrated into a glass fiber the pyrometric sensor being formed by a local doping of the core of the glass fiber by a material possessing the properties of a black body at least in a wavelength region detectable by the light detector; said light detector comprises an Indium Galium, Arsenic (InGaAs) photodiode.
Claim 10
Dependent Claim
120 words
Pyrometric temperature measuring instrument comprising: at least one optical waveguide having a core and a cladding; at least one pyrometric sensor provided at one end of said at least one optical waveguide; and a light detector; wherein: said optical waveguide has a core of a diameter of more than approximately 100 μm and numerical aperture of more than approximately 0.3; said optical waveguide and the pyrometric sensor are integrated into a glass fiber the pyrometric sensor being formed by a local doping of the core of the glass fiber by a material possessing the properties of a black body at least in a wavelength region detectable by the light detector; said light detector comprises an Indium Galium, Arsenic (InGaAs) photodiode.
Claim 11
Dependent Claim
107 words
Pyrometric temperature measuring instrument comprising: at least one optical waveguide having a core and a cladding; several pyrometric sensors; and a light detector; wherein: said optical waveguide has a core of a diameter of more than approximately 100 μm and numerical aperture of more than approximately 0.3; said optical waveguide and the pyrometric sensors are integrated into a glass fiber the pyrometric sensors being formed by several local dopings of the core of the glass fiber by a material possessing the properties of a black body at least in a wavelength region detectable by the light detector; said light detector comprises an Indium, Galium, Arsenic (InGaAs) photodiode.
Claim 12
Dependent Claim
107 words
Pyrometric temperature measuring instrument comprising: at least one optical waveguide having a core and a cladding; several pyrometric sensors; and a light detector; wherein: said optical waveguide has a core of a diameter of more than approximately 100 μm and numerical aperture of more than approximately 0.3; said optical waveguide and the pyrometric sensors are integrated into a glass fiber the pyrometric sensors being formed by several local dopings of the core of the glass fiber by a material possessing the properties of a black body at least in a wavelength region detectable by the light detector; said light detector comprises an Indium, Galium, Arsenic (InGaAs) photodiode.
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