Thermal measuring and testing – Thermal calibration system – By thermal radiation emitting device
Reexamination Certificate
2000-04-04
2001-09-04
Gutierrez, Diego (Department: 2859)
Thermal measuring and testing
Thermal calibration system
By thermal radiation emitting device
C374S129000, C374S133000, C250S252100
Reexamination Certificate
active
06283629
ABSTRACT:
This invention relates to a method of calibrating a radiation thermometer, which comprises a radiation sensor and an ambient temperature sensor, by means of a radiation standard with known temperature.
By means of a radiation sensor, the temperature differential between an object of measurement and a reference object-for example, a shutter or the radiation sensor itself-can be determined. In order to determine the absolute temperature of the object of measurement, additional knowledge is required of the temperature of the reference object. This temperature is conveniently determined by means of a temperature sensor thermally connected to the reference object in the best possible manner.
In the calibration of a radiation thermometer which incorporates a radiation sensor and an ambient temperature sensor, it is thus necessary to calibrate both sensors. In prior-art calibration methods, the output signals of the two sensors are determined at different radiation and ambient or reference temperatures. From these signals, the corresponding calibration parameters can then be established. To calibrate the ambient temperature sensor, the ambient temperature (possibly also several ambient temperatures) is (are) determined by means of an external, calibrated thermometer. The temperature of the external thermometer has to come as close as possible to the temperature of the sensor to be calibrated (for example, by immersing the sensor and the thermometer in the same liquid or by a prolonged adaptation period). The calibration of the ambient temperature sensor is thus conducted independently of the calibration of the radiation sensor.
Applicant knows from the field of control engineering that the time response of a system is described with reference to specified system quantities as well as parameters which ultimately describe the time response of the total system. To determine these parameters, it is known in the art to detect the system quantities variable with time and, using the detected quantities, to solve the system of equations for the parameters. On the basis of the parameters thus established, it is thus possible to describe the system's time response for the future. This method has become known in the art under the term referred to as process parameter identification. This method involves an overdetermination of the system of equations, that is, more pairs of measuring quantities are detected than are actually required, so that, for example, six equations are available for four quantities to be determined. The parameters to be established are determined by means of these six equations such that, for example, the square errors are minimized. This enables inaccuracies in the measurement of individual system quantities to be compensated for.
It is an object of the present invention to indicate a method which enables the calibration of a radiation thermometer to be performed in simple manner, said radiation thermometer including a radiation sensor and an ambient temperature sensor.
REFERENCES:
patent: Re. 34789 (1994-11-01), Fraden
patent: 3318133 (1967-05-01), Hahn
patent: 4464725 (1984-08-01), Briefer
patent: 4634294 (1987-01-01), Christol
patent: 4784149 (1988-11-01), Berman et al.
patent: 4790324 (1988-12-01), O'Hara et al.
patent: 4993419 (1991-02-01), Pompei et al.
patent: 5001657 (1991-03-01), Yagura et al.
patent: 5024533 (1991-06-01), Egawa et al.
patent: 5150969 (1992-09-01), Goldberg et al.
patent: 5293877 (1994-03-01), O'Hara et al.
patent: 5333784 (1994-08-01), Pompei
patent: 5967992 (1999-10-01), Canfield
patent: 6065866 (2000-05-01), Kraus et al.
patent: 44 12 973 (1994-11-01), None
patent: 0 446 788 (1991-09-01), None
patent: 62-291526 (1987-12-01), None
patent: 93/03666 (1993-03-01), None
Beerwerth Frank
Heubach Klaus
Kaiser Manfred
Kraus Bernhard
Braun GmbH
Fish & Richardson P.C.
Gutierrez Diego
Pruchnic Jr. Stanley J.
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