Infrared Sensor Gas Absorption Correction for Reflective Surface Temperature
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Solution Overview
Problem
Conventional radiation thermometers face accuracy issues when measuring the temperature of reflective objects like glass due to high reflection rates in the far-infrared band, and existing solutions fail to adequately correct for absorption influences from gases like water vapor and carbon dioxide in the middle-infrared band.
Innovation Solution
A radiation temperature measuring device that uses an infrared sensor to detect the middle-infrared band, calculates the absorption rate of gases, and corrects the surface temperature measurement using stored conversion information and absorption rates to account for water vapor, carbon dioxide, and methane absorption, thereby improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the far-infrared band (8-14 μm) is used for temperature measurement, then the measurement can be performed at room temperature with good agreement to Stefan-Boltzmann law, but the reflection rate increases to about 20% for reflective objects like glass, deteriorating measurement accuracy
Solution Approach 1:
The patent changes the detection wavelength parameter from the conventional far-infrared band (8-14 μm) to the middle-infrared band (3-8 μm), specifically targeting wavelengths where glass has lower reflectivity. This parameter change allows the system to maintain temperature measurement capability while reducing the harmful reflection effect on reflective objects like glass.
2Object-generated harmful factors
If the middle-infrared band (3-8 μm) is used to reduce reflection, then the reflection rate decreases, but absorption by atmospheric gases (water vapor, carbon dioxide, methane) increases, introducing new measurement errors
Solution Approach 1:
The patent introduces a feedback mechanism where the system measures or estimates atmospheric gas concentration and temperature, then uses this information to calculate and compensate for gas absorption effects in real-time. This feedback loop allows the system to adapt to varying atmospheric conditions and maintain measurement accuracy despite the presence of absorbing gases.
Solution Approach 2:
The patent introduces an intermediate calculation step that separates the measurement into two components: the raw infrared signal and the calculated gas absorption effect. By introducing this intermediate absorption rate calculation as a mediator, the system can subtract the gas absorption component from the total signal to obtain the accurate object temperature, effectively isolating and compensating for the harmful gas absorption effect.
3Device complexity
If conventional radiation thermometry is used without absorption correction, then the device structure remains simple, but measurement accuracy deteriorates due to uncorrected gas absorption effects in the middle-infrared band
Solution Approach 1:
The patent performs preliminary calculations of gas absorption rates based on atmospheric conditions before final temperature determination. By pre-calculating the absorption coefficients and expected absorption effects, the system prepares correction data in advance that can be quickly applied during measurement, reducing the computational burden during real-time operation while maintaining accuracy.
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 device achieves precise temperature measurement by correcting for absorption influences, enhancing accuracy and reducing errors associated with gas absorption in the middle-infrared band, even in real-world environments where absolute humidity and zero distance are impractical.
Implementation Method 1
an infrared sensor configured to detect a wavelength including an absorption band by atmosphere existing between the infrared sensor and the object
Implementation Method 2
an absorption band by atmosphere existing between the infrared sensor and the object
Data Source
AI summary
A radiation temperature measuring device includes: an infrared sensor that detects a wavelength including an absorption band by atmosphere; an absorption rate calculation unit that calculates an absorption rate by the atmosphere when measuring a surface temperature of an object from output of the infrared sensor; an output storage unit that stores conversion information for converting the output of the infrared sensor into the surface temperature of the object; a surface temperature calculation correction unit that calculates the surface temperature of the object from the output of the infrared sensor, the absorption rate calculated by the absorption rate calculation unit, and the conversion information; and an absorption rate storage unit that stores in advance the absorption rate by the atmosphere when the conversion information is set, in which the calculated surface temperature of the object is corrected with the absorption rate stored in the absorption rate storage unit.