Temperature measuring pyrometer probe which compensates for radiation heat transfer and pneumatic losses
First Claim
1. A temperature measuring pyrometer probe comprising:
- an inner hollow body defining an inner chamber, said inner hollow body having an open end, said inner chamber in communication with ambient gas surrounding the pyrometer probe at said open end, said inner hollow body mounted within an outer hollow body forming cooling channel means for cooling said inner hollow body;
a converging-diverging nozzle secured to an inner chamber wall of said inner hollow body, said converging-diverging nozzle positioned to direct said ambient gas into said inner chamber toward a thermocouple junction of a thermocouple, said converging-diverging nozzle having a wall suction channel for drawing a boundary layer of an ambient gas flow away from said thermocouple junction;
suction inlet means for admitting said ambient gas surrounding the pyrometer probe into said converging-diverging nozzle and drawing said ambient gas flow through said inner chamber and said wall suction channel;
positioner means for mounting said thermocouple junction in a centered position within a throat of said converging-diverging nozzle downstream, with respect to said ambient gas flow, from said wall suction channel;
gas cooling means for pulsing reverse cooling gas flow through said converging-diverging nozzle, computing means for controlling said reverse cooling gas flow;
said computing means continuously alternating said cooling gas flow and said ambient gas flow through said inner chamber;
said thermocouple junction electrically coupled to said computing means; and
said computing means calculating radiation heat transfer losses and pneumatic cooling and determining an instantaneous gas temperature.
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Accused Products
Abstract
An apparatus and process for a temperature measuring pyrometer probe that measures gas temperatures above the melting point of conventional thermocouple material. The apparatus is used to calculate radiation heat losses and compensate for pneumatic cooling from the thermocouple junction of the pyrometer probe. The pyrometer probe has an inner hollow body which defines an inner chamber. The inner hollow body has an open end and the inner chamber is in communication with ambient gas surrounding the pyrometer probe. The inner hollow body is mounted within an outer hollow body and such mounting defines cooling channels. The cooling channels accommodate fluid flow which cools the inner hollow body. The ambient gas is directed into a converging-diverging nozzle, mounted within the inner hollow body, toward a thermocouple junction. The converging-diverging nozzle has a wall suction channel through which a boundary layer of the ambient gas is drawn away from the thermocouple junction. The thermocouple junction is mounted within a throat section of the converging-diverging nozzle. The pyrometer probe is intermittently cooled with gas by pulsing reverse cooling gas flow through the pyrometer probe. A computing system is used to continuously acquire temperature signals from the thermocouple and alternate the cooling gas flow and the ambient gas flow through the inner chamber of the pyrometer probe based on the temperature response. The computing system calculates radiation heat transfer losses, pneumatic cooling of the pyrometer probe, and instantaneous gas temperatures.
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Citations
15 Claims
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1. A temperature measuring pyrometer probe comprising:
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an inner hollow body defining an inner chamber, said inner hollow body having an open end, said inner chamber in communication with ambient gas surrounding the pyrometer probe at said open end, said inner hollow body mounted within an outer hollow body forming cooling channel means for cooling said inner hollow body; a converging-diverging nozzle secured to an inner chamber wall of said inner hollow body, said converging-diverging nozzle positioned to direct said ambient gas into said inner chamber toward a thermocouple junction of a thermocouple, said converging-diverging nozzle having a wall suction channel for drawing a boundary layer of an ambient gas flow away from said thermocouple junction; suction inlet means for admitting said ambient gas surrounding the pyrometer probe into said converging-diverging nozzle and drawing said ambient gas flow through said inner chamber and said wall suction channel; positioner means for mounting said thermocouple junction in a centered position within a throat of said converging-diverging nozzle downstream, with respect to said ambient gas flow, from said wall suction channel; gas cooling means for pulsing reverse cooling gas flow through said converging-diverging nozzle, computing means for controlling said reverse cooling gas flow; said computing means continuously alternating said cooling gas flow and said ambient gas flow through said inner chamber;
said thermocouple junction electrically coupled to said computing means; andsaid computing means calculating radiation heat transfer losses and pneumatic cooling and determining an instantaneous gas temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification