Multi-Wavelength Radiance Measurement for Dust-Attenuated Temperature
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Solution Overview
Problem
Conventional temperature measurement methods in high-dust environments, such as rotary kilns in cement manufacturing facilities, face challenges in accurately measuring temperatures due to dust attenuation and interference, limiting the effectiveness of radiation thermometers and other non-contact methods.
Innovation Solution
A method involving multiple radiance meters measuring radiances at different wavelengths to distinguish and separate the radiance from the object being measured from the radiance of the dust, allowing for accurate temperature and dust concentration determination by using blackbody cavities or other objects with varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a radiation thermometer is used to measure temperature in a high-dust environment, then non-contact temperature measurement is achieved, but measurement accuracy deteriorates due to dust attenuation and interference
Solution Approach 1:
The patent segments the total radiance signal into multiple wavelength components, measuring radiance at different wavelengths separately. By dividing the measurement into spectral segments, the system can distinguish between object radiance and dust radiance, resolving the contradiction between non-contact measurement capability and measurement accuracy in high-dust environments
Solution Approach 2:
The patent introduces a new measurement dimension by adding wavelength discrimination to the traditional single-point temperature measurement. By measuring radiance across multiple wavelengths and analyzing the spectral distribution, the system extracts temperature information while compensating for dust interference, thereby maintaining measurement accuracy without sacrificing non-contact capability
2Measurement precision
If a two-color thermometer is used to ignore dust attenuation, then temperature measurement is improved, but dust radiance interference cannot be eliminated
Solution Approach 1:
The patent extends the two-color approach by segmenting the radiance measurement into three or more wavelength bands. This enhanced segmentation allows the system to not only compensate for attenuation effects but also to identify and separate dust radiance contributions from object radiance, thereby eliminating both types of dust interference
Solution Approach 2:
The patent uses blackbody cavities as intermediary reference objects with known temperatures. By measuring radiance from these reference blackbodies through the same dust-laden medium, the system creates a reference measurement that captures dust effects. This intermediary measurement serves as a baseline to subtract dust radiance from the object measurement, eliminating dust interference
3Measurement precision
If local measurement with reduced volume is performed, then measurement precision is improved, but dust influence on optical path cannot be eliminated
Solution Approach 1:
The patent resolves this contradiction by adding spectral dimension to the local measurement approach. Instead of relying solely on spatial reduction, the system uses multi-wavelength radiance measurement to differentiate between object emission and dust emission. This dimensional extension allows precise local measurement while simultaneously compensating for dust influence on the optical path
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
This approach enhances measurement accuracy by eliminating dust interference, enabling precise temperature measurement of objects in high-dust environments, such as rotary kilns, and improving heat recovery efficiency.
Implementation Method 1
a first radiance meter is directed toward an object to be measured and measures radiance through a space where dust is present with the use of at least two wavelengths
Implementation Method 2
measuring radiances through the space with the use of at least two wavelengths by the second radiance meters respectively
Data Source
AI summary
A first radiance meter is directed toward an object to be measured, radiance is measured through a space where dust is present with the use of at least two wavelengths by the first radiance meter, second radiance meters which are equal in number to one or more objects having temperatures different from that of the object to be measured are directed toward the objects, radiances are measured through the space with the use of at least two wavelengths by the second radiance meters respectively, and a temperature of the object to be measured, a temperature of the dust, and concentration of the dust are measured from the radiances measured by the first radiance meter and the second radiance meters.