Thermal Radiation Sensor Layout for Low-Temperature Laser Sensing
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Solution Overview
Problem
The accuracy of temperature measurement in laser processing devices is compromised by environmental temperature, particularly at low temperatures (250° C. or less), due to the influence of environmental factors.
Innovation Solution
A thermal radiation light detection device with a housing containing light entrance and extraction units, and separate light detection and temperature detection units for different wavelengths, allowing for accurate temperature measurement by correcting signals based on thermal radiation from distinct wall portions within the device's field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thermal radiation light detection is performed using a conventional single detection unit, then the device structure is simple, but the temperature measurement accuracy is reduced due to environmental temperature influence
Solution Approach 1:
The detection device is segmented into multiple functional units: a light detection unit for detecting thermal radiation light and a temperature detection unit for detecting environmental temperature. These units are attached to different wall portions of the housing, allowing independent measurement and correction of environmental influences on temperature measurement accuracy.
Solution Approach 2:
The temperature detection unit acts as an intermediary that measures the environmental temperature affecting the housing wall. This measured temperature is then used to correct the thermal radiation light detection signals, eliminating the harmful effect of environmental temperature on measurement accuracy without requiring direct measurement of the target object's temperature alone.
2Measurement precision
If the light detection unit and temperature detection unit are attached to the same wall portion, then the device structure is simplified, but the correction accuracy is reduced due to thermal radiation from other wall portions
Solution Approach 1:
The light detection unit and temperature detection unit are attached to different wall portions of the housing. This spatial segmentation ensures that the temperature detection unit measures the temperature of the specific wall portion that directly influences the thermal radiation light detection, while other wall portions do not interfere with the measurement, thereby improving correction accuracy.
Solution Approach 2:
Each detection unit is strategically positioned on specific wall portions where they can most effectively perform their functions. The light detection unit is placed to optimize thermal radiation light reception, while the temperature detection unit is placed on a wall portion whose temperature most significantly affects the measurement, allowing each unit to operate with optimal local conditions.
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 highly accurate temperature measurement by isolating and correcting for environmental thermal radiation influences, improving measurement precision in laser processing applications.
Implementation Method 1
a light extraction unit disposed inside housing and configured to extract light of a first wavelength and light of a second wavelength from the thermal radiation light
Implementation Method 2
a first light detection unit attached to a wall portion among the plurality of wall portions and configured to detect the light of the first wavelength; a second light detection unit attached to a wall portion among the plurality of wall portions and configured to detect the light of the second wavelength
Implementation Method 3
thermal radiation light emitted from the housing enters at least the first light detection unit... thermal radiation light emitted from the wall portions different from the wall portion to which the first light detection unit is attached is likely to enter the first light detection unit
Data Source
AI summary
A thermal radiation light detection device includes: a housing including a plurality of wall portions; a light entrance unit attached to a wall portion and configured to cause thermal radiation light to enter the housing; a light extraction unit disposed inside housing and configured to extract light of a first wavelength and light of a second wavelength from the thermal radiation light, the second wavelength being different from the first wavelength; a first light detection unit attached to a wall portion and configured to detect the light of the first wavelength; a second light detection unit attached to a wall portion and configured to detect the light of the second wavelength; and a first temperature detection unit attached to a wall portion, the wall portion to which the first temperature detection unit is attached being different from the wall portion to which the first light detection unit is attached.