Pyrometric temperature measuring instrument
AssigneeBBC Brown, Boveri & Company, Limited
InventorsMeinolph Kaufmann, Lothar Schultheis
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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 .mu.m or more, and is surrounded by a light-tight cover (7).
Claims7
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 .mu.m 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.
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 .mu.m, 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.
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 .mu.m, 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.
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 .mu.m 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.
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 .mu.m 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.
Dependencies are inferred from the claim text.