Two-Color Thermometer Correction for Emissivity-Driven Temperature Error
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Solution Overview
Problem
Existing two-color thermometers face errors in temperature measurement due to material properties and wavelength-dependent emissivity variations, particularly in metals, leading to inaccuracies in temperature calculations using intensity ratios of infrared radiation at different wavelengths.
Innovation Solution
A two-color thermometer system that includes first and second sensors to detect infrared radiation at different wavelengths, along with a temperature calculator using correction functions based on pre-calculated coefficients for various materials, to accurately measure temperature by considering material-specific emissivity variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If temperature is calculated using intensity ratio between infrared radiation at two different wavelengths, then emissivity of the object is not required, but measurement error occurs due to wavelength-dependent emissivity variations
Solution Approach 1:
The patent introduces correction coefficients (first correction coefficient and second correction coefficient) that are calculated in advance for different materials. These coefficients are used to correct the temperature measurement results, effectively changing the measurement parameters to account for material-specific emissivity variations at different wavelengths.
Solution Approach 2:
The patent uses correction coefficients as intermediary values that mediate between the raw intensity ratio measurement and the final temperature calculation. These coefficients serve as a bridge that accounts for material properties without requiring direct emissivity input from the user.
2Measurement precision
If correction coefficients are calculated for multiple different materials, then measurement accuracy for various materials is improved, but device complexity increases
Solution Approach 1:
The patent creates a universal correction function that can handle multiple different materials through a single unified approach. The correction coefficients are calculated in advance for various materials and stored, allowing the system to adapt to different materials without requiring separate measurement procedures or complex material identification mechanisms.
Solution Approach 2:
The correction coefficients are calculated in advance before actual temperature measurements are performed. This preliminary calculation and storage of correction data for multiple materials simplifies the real-time measurement process, as the system only needs to retrieve and apply the pre-calculated coefficients rather than performing complex calculations during measurement.
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
The system achieves high-accuracy temperature measurement by correcting for material-specific emissivity differences, ensuring precise temperature calculations and enabling efficient laser system control.
Implementation Method 1
a first sensor that detects a first intensity that is an intensity of first infrared radiation emitted by an object
Implementation Method 2
a second sensor that detects a second intensity that is an intensity of second infrared radiation emitted by the object at a wavelength different from a wavelength of the first infrared radiation
Data Source
AI summary
A two-color thermometer includes: a first sensor that detects a first intensity that is an intensity of first infrared radiation emitted by an object; a second sensor that detects a second intensity that is an intensity of second infrared radiation emitted by the object at a wavelength different from a wavelength of the first infrared radiation; and a temperature calculator that calculates a first coefficient by inputting, into a correction function, a second coefficient calculated from the first intensity detected by the first sensor and the second intensity detected by the second sensor, and calculates a temperature of the object based on the first coefficient calculated and an intensity ratio between the first intensity and the second intensity. The correction function is calculated from a first correction coefficient and a second correction coefficient that are calculated in advance from a measured temperature of each of different materials.