Dual Radiance Meter Temperature Measurement in Dusty Atmospheres
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Solution Overview
Problem
Existing temperature measurement methods in high-dust environments, such as rotary kilns in cement production, face inaccuracies due to dust interference, which conventional radiation thermometers and two-color thermometers struggle to overcome effectively.
Innovation Solution
A method using dual radiance meters to measure the radiance of both the object and the dust, with the second radiance meter positioned to avoid direct line-of-sight and employing cooling and emissivity adjustments to reduce interference, allowing for accurate temperature measurement by accounting for dust radiance at multiple wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a radiation thermometer is used to measure temperature in a high-dust environment, then contactless temperature measurement is achieved, but measurement accuracy deteriorates due to dust attenuation and dust radiation interference
Solution Approach 1:
The patent divides the temperature measurement task into two separate measurements: one for the object's radiance and another for the dust's radiance. By using two radiance meters positioned at different angles, the system segments the harmful dust interference from the useful object measurement, allowing separate quantification and compensation of dust effects.
Solution Approach 2:
The second radiance meter acts as an intermediary that measures the dust radiance separately. This intermediary measurement enables the system to characterize the dust's interfering effect without directly affecting the primary temperature measurement, providing data that can be used to compensate for dust attenuation and radiation in the object's temperature calculation.
2Measurement precision
If a two-color thermometer is used to ignore dust attenuation, then temperature measurement is improved, but dust radiation interference cannot be ignored as it changes the radiance ratio
Solution Approach 1:
The patent extends the segmentation approach by measuring radiance at multiple wavelengths (not just two) and separating object radiance from dust radiance through angular differentiation. This allows the system to handle both attenuation and radiation effects that vary across the spectrum, improving adaptability to complex high-dust environments.
Solution Approach 2:
The patent adds the angular dimension to the measurement system. By positioning radiance meters at different angles (one facing the object, another facing away to measure dust), the system creates a new measurement dimension that enables separation of object and dust contributions, making the system adaptable to high-dust environments where conventional two-color methods fail.
3Measurement precision
If local measurement techniques are used to reduce measurement volume, then fine structure measurement is improved, but dust effect on optical path cannot be eliminated
Solution Approach 1:
The second radiance meter serves as an intermediary that specifically measures the dust's contribution to the optical path. This separate measurement allows the system to quantify and compensate for dust effects on the optical path, maintaining fine structure measurement accuracy even in high-dust environments where local measurement techniques alone are insufficient.
Solution Approach 2:
The system uses feedback from the second radiance meter's dust radiance measurement to compensate for dust effects in the primary temperature calculation. By continuously monitoring dust radiance and using this information to correct the object temperature measurement, the system maintains accuracy despite dust presence in 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 significantly enhances measurement accuracy by isolating dust interference effects, enabling precise temperature determination of objects in high-dust environments, such as rotary kilns, with improved accuracy compared to conventional methods.
Implementation Method 1
a first radiance meter which is provided to face the object in an atmosphere where dust is present and measures a radiance of the object
Implementation Method 2
a second radiance meter which is provided without facing the object and measures a radiance of the dust present between the object and the first radiance meter
Implementation Method 3
the measurement is performed in a state where a temperature of a wall surface facing the second radiance meter is lowered by cooling means
Data Source
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AI summary
A first radiance meter that is provided so as to face an object in an atmosphere in which there is dust and measures the radiance of the object and a second radiance meter that is provided so as not to oppose the object and measures the radiance of the dust between the object and the first radiance meter are used to measure the temperature of the object on the basis of the object radiance that has been measured by the first radiance meter and the radiance of the dust between the obj ect and the first radiance meter that has been measured by the second radiance meter.