Method and apparatus for determining internal temperature and coefficient of internal thermal conductivity in a stucture
First Claim
1. An apparatus for determining the internal temperature of one of an object and a body, said one of an object and a body having a surface, said apparatus comprising:
- a heat flux sensor, said heat flux sensor in turn comprising;
first and second structures with at least a known ratio of thermal conductance, each of said structures having a first side and a second side opposite to said first side, said first side of said first structure and said first side of said second structure being positioned against said surface, said second side of said first structure and said second side of said second structure being in thermal communication with ambient temperature; and
four thermosensitive elements positioned in substantially opposed pairs at said first and second sides of said first structure and said first and second sides of said second structure respectively, said four thermosensitive elements measuring;
a surface temperature at said first side of said first structure and at said first side of said second structure; and
a temperature of said second side of said first structure and of said second side of said second structure which are in thermal communication with said ambient temperature; and
a calculation unit which calculates said internal temperature of said one of an object and a body via a doubled solution on the basis of;
said surface temperature at said first side of said first structure;
said surface temperature at said first side of said second structure;
said temperatures of said second side of said first structure and said second side of said second structure; and
said at least a known ratio of thermal conductance;
wherein said doubled solution combines individual temperature solutions for each of said first and second structures.
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Accused Products
Abstract
The invention relates to a method and apparatus for determining the internal temperature and the coefficient of internal thermal conductivity of a structure. In both cases, the surface temperature and ambient temperature of an object are measured from both sides of two structures whose thermal conductivities are known. On the basis of the measured temperature values, the internal temperature or the coefficient of internal thermal conductivity of the object is determined from the function of the heat flux. Thereafter the unknown thermal conductivity or the unknown internal temperature of the object is eliminated from the solutions, and the internal temperature or the coefficient of internal thermal conductivity of the object is determined on the basis of the combined solution.
62 Citations
12 Claims
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1. An apparatus for determining the internal temperature of one of an object and a body, said one of an object and a body having a surface, said apparatus comprising:
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a heat flux sensor, said heat flux sensor in turn comprising; first and second structures with at least a known ratio of thermal conductance, each of said structures having a first side and a second side opposite to said first side, said first side of said first structure and said first side of said second structure being positioned against said surface, said second side of said first structure and said second side of said second structure being in thermal communication with ambient temperature; and four thermosensitive elements positioned in substantially opposed pairs at said first and second sides of said first structure and said first and second sides of said second structure respectively, said four thermosensitive elements measuring; a surface temperature at said first side of said first structure and at said first side of said second structure; and a temperature of said second side of said first structure and of said second side of said second structure which are in thermal communication with said ambient temperature; and a calculation unit which calculates said internal temperature of said one of an object and a body via a doubled solution on the basis of; said surface temperature at said first side of said first structure; said surface temperature at said first side of said second structure; said temperatures of said second side of said first structure and said second side of said second structure; and said at least a known ratio of thermal conductance; wherein said doubled solution combines individual temperature solutions for each of said first and second structures. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for determining the internal temperature of one of an object and a body, said one of an object and a body having a surface, said method comprising the steps of:
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(a) providing a heat flux sensor having first and second structures with at least a known ratio of thermal conductance, each of said structures having a first side and a second side opposite to said first side; (b) positioning said sensor against said surface with said first side of said first structure and said first side of said second structure against said surface and said second side of said first structure and said second side of said second structure in thermal communication with ambient temperature; (c) measuring a surface temperature at said first side of said first structure and at said first side of said second structure; (d) measuring a temperature of said second side of said first structure and said second side of said second structure which are in thermal communication with said ambient temperature; and (e) determining said internal temperature of said one of an object and a body via a doubled solution on the basis of; said surface temperature at said first side of said first structure; said surface temperature at said first side of said second structure; said temperatures of said second side of said first structure and said second side of said second structure; and said at least a known ratio of thermal conductance; wherein said doubled solution combines individual temperature solutions for each of said first and second structures and eliminates an unknown thermal conductance of said one of an object and a body via said combination of said individual solutions. - View Dependent Claims (12)
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Specification