Temperature control system
This patent describes a furnace for heating articles to an elevated set point temperature and comprising a heating chamber through which the articles are moved. The articles are in a stationary state for at least a first time interval and in a moving state for a second time interval following the first time interval. A combustion means generates and applies thermal energy within the chamber to heat the articles. Combustion adjustment means adjusts the amount of thermal energy generated by the combustion means, and temperature control means for measuring the temperature of the articles and applyies a control signal to the combustion adjustment means so as to adjust the temperature of the articles toward the set point temperature. The improvement in the temperature control means comprises: thermocouple means comprising probe means adapted to selectively contact the articles during the first time interval for sensing the temperature of the articles and for generating a thermocouple temperature signal representative of the temperature of the articles during the first time interval as sensed by the probe means; radiation sensing means for sensing the radiant energy emitted by the articles and for generating a radiation temperature signal representative of the temperature of the articles based on the sensed radiant energy; and compensation circuit means connected to the combustion adjustment means and responsive to the thermocouple temperature signal and the radiation temperature signal for generating the control signal. The value of the control signal at a given time during the second time interval is a function of the article temperature as sensed by the thermocouple means. The article temperature is sensed by the radiation sensing means at substantially the given time.
- Assignee:
- Granco-Clark, Inc., Belding, MI
- Patent Number(s):
- US 4675826
- OSTI ID:
- 6366495
- Resource Relation:
- Patent File Date: Filed date 6 Aug 1984
- Country of Publication:
- United States
- Language:
- English
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