Radiation Thermometer Surface Temperature Correction
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Solution Overview
Problem
When using a radiation thermometer to measure the surface temperature of a target, if the temperature measurement range is larger than the target mask opening, it is impossible to accurately measure the temperature of the target alone, as the thermometer also measures the inside of the target mask and integrating sphere, leading to interference and inaccurate readings.
Innovation Solution
A surface temperature measuring apparatus that includes a radiation thermometer to measure the surface temperature of a larger measurement range, a second temperature measuring means to measure a region outside the target area but with similar temperature, and a correcting mechanism to accurately determine the surface temperature of the target by using the measured temperature from the second means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the radiation thermometer measures temperature over a large range including the target mask and integrating sphere, then the measurement can be performed without additional optical components, but the measurement precision deteriorates because the temperature of the target alone cannot be accurately measured
Solution Approach 1:
The patent divides the measurement range into two segments: the target region and the surrounding region (including target mask and integrating sphere). By measuring both regions separately and using their temperature difference in correction calculations, the system achieves accurate target temperature measurement without requiring additional optical components to isolate the measurement field.
Solution Approach 2:
The patent introduces the surrounding region temperature (measured by the radiation thermometer) as an intermediary parameter to correct the target temperature measurement. This intermediary measurement allows the system to compensate for the thermal interference from the target mask and integrating sphere, enabling accurate target temperature measurement using the existing large-range radiation thermometer.
2Measurement precision
If a lens is added to the radiation thermometer to adjust the measurement diameter to match the target region, then the measurement precision improves, but the device complexity and cost increase
Solution Approach 1:
The patent extracts the temperature measurement function from the optical focusing system. Instead of using a lens to spatially filter and measure only the target region, the system measures the temperature over a larger area and then extracts the target temperature information through mathematical correction based on the temperature difference between the target and surrounding regions.
Solution Approach 2:
The patent replaces the mechanical/optical solution (adding a lens to the radiation thermometer) with a computational correction method. By calculating the temperature difference between the target region and surrounding regions and applying this to correct the measurement, the system achieves precise target temperature measurement without additional optical components.
3Object-affected harmful factors
If the radiation thermometer is positioned at a distance of approximately 150 mm from the measurement target, then the optical system interference is avoided, but the measurement precision deteriorates because the measurement range becomes larger than the target region
Solution Approach 1:
The patent uses the temperature measurement from the surrounding region as feedback to correct the target temperature measurement. By continuously measuring both the target region temperature and the surrounding region temperature, and using the temperature difference in correction calculations, the system maintains accurate target temperature measurement even at the fixed distance of approximately 150 mm where optical interference is avoided.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate measurement of the surface temperature of the target even when the temperature measurement range is larger than the target area, by correcting the radiation thermometer's measurements using the second temperature means, thus preventing interference and improving measurement accuracy.
Implementation Method 1
a radiation thermometer that measures a surface temperature Tm of a measurement range larger than a measurement target region of a measurement target, the radiation thermometer detecting, by a sensor, an infrared ray radiated from an object surface of a specified measurement range to measure a surface temperature of an object
Data Source
AI summary
A surface temperature measuring apparatus includes a radiation thermometer (11) that measures a surface temperature (Tm) of a measurement range larger than a measurement target region of a measurement target (100), the radiation thermometer (11) detecting, by a sensor, an infrared ray radiated from an object surface of a specified measurement range to measure a surface temperature of an object, a second temperature measuring means (11) that measures a surface temperature (Tn) of a region outside the measurement target region of the measurement target (100) but within the measurement range of the surface temperature (Tm) by the radiation thermometer (11), or a region having an identical or substantially identical temperature to a temperature of the region outside the measurement target region, and a correcting means (12) that corrects the surface temperature (Tm) that is measured using the surface temperature (Tn) that is measured into a surface temperature (T) of the measurement target (100).