Electric heating – Heating devices – With power supply and voltage or current regulation or...
Patent
1989-01-18
1991-05-21
Paschall, M. H.
Electric heating
Heating devices
With power supply and voltage or current regulation or...
219851, 219494, 374121, 374131, H05B 102
Patent
active
050177613
ABSTRACT:
A heater probe assembly used to heat treat a portion of a metallic tube that is surrounded by a heat sink is disclosed. The heater probe assembly heats the tube to a selected temperature range to relieve stress in and prevent degradation of the tube portion. The heater probe assembly includes an elongated probe body that is insertable and slidably movable within the tube portion. A radiant heat source is removably mounted on the probe body and heats the tube portion to incandescence within the selected temperature range. A temperature monitoring device monitors the temperature of the tube portion. The temperature monitoring device includes first and second optical measuring devices which determine the color of the tube portion at its longitudinally middle and end portions of the tube portion. An optical pyrometer translates the optical color measurement into a temperature measurement. A fiber-optic cable connects the first and second optical measuring device to first and second prisms which conducts the light of incandescence of the heated tube portion to the temperature monitoring device. A probe sleeve is mounted on the probe body and prevents light from the heat source from reflecting in to the prisms. An eddy current sensing device properly locates the heater probe assembly within the tube.
REFERENCES:
patent: 4273127 (1981-06-01), Auth et al.
patent: 4484059 (1984-11-01), Lillquist
patent: 4700040 (1987-10-01), Diggers
patent: 4944826 (1990-07-01), Zollman et al.
Paschall M. H.
Westinghouse Electric Corp.
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