Wide-Range Temperature Measurement With Dynamic Neutral-Density Filtering
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Solution Overview
Problem
Conventional temperature measurement devices face challenges in maintaining accuracy and linearity over a wide temperature range, particularly beyond 500°C, due to signal saturation and reduced sensitivity, necessitating multiple devices with adjusted gain values, which complicates and increases costs.
Innovation Solution
A temperature measurement structure and method that includes a lens set, optical base, mask shutter assembly, and temperature sensing unit, utilizing a neutral density filter to maintain signal linearity by adding or removing it based on dynamic linearity strength values, and employing a motor for correction, enabling accurate temperature measurement from −30°C to 1000°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If signal output gain values are adjusted by reducing them to measure high-temperature targets beyond 500°C, then the temperature measurement range is extended, but measurement signals become saturated and temperature measurement precision is degraded
Solution Approach 1:
The patent implements dynamic gain adjustment where the system automatically selects different gain values based on the measured temperature range. The gain value is dynamically changed from a first gain value for lower temperatures to a second gain value for higher temperatures, preventing signal saturation while maintaining measurement precision across the extended range.
Solution Approach 2:
The patent changes the gain parameter adaptively based on temperature conditions. By monitoring the temperature measurement results and comparing them against reference values, the system adjusts the gain parameter to optimize signal strength and precision for different temperature intervals, thereby extending the measurable temperature range without sacrificing accuracy.
2Measurement precision
If segmented linear mathematic curve correction is applied to meet linearity in response to wide temperature range, then temperature measurement precision is achieved within certain ranges, but device complexity increases and manufacturers need to create multiple devices for different temperature intervals
Solution Approach 1:
The patent creates a universal temperature measurement device that can accurately measure across multiple temperature intervals (including beyond 500°C) using a single device. The system achieves this by implementing multiple gain values and automatically selecting the appropriate gain based on the measurement conditions, eliminating the need for manufacturers to create multiple specialized devices for different temperature ranges.
Solution Approach 2:
The system performs self-adjustment by automatically selecting the appropriate gain value based on the measured temperature. The processor monitors the temperature measurement results and dynamically adjusts the gain parameter without external intervention, enabling the device to maintain optimal performance across different temperature intervals independently.
3Reliability
If temperature measurement devices are designed with optimized correction parameters for specific temperature intervals, then accuracy and linearity are maintained within corresponding ranges, but the ability to measure wide temperature range with a single device is limited
Solution Approach 1:
The patent implements dynamic adaptation where the system automatically adjusts its operating parameters (gain values) based on the measured temperature. This dynamic behavior enables the device to maintain reliability and accuracy across different temperature intervals while adapting to the specific measurement conditions, thereby achieving wide temperature range coverage with a single device.
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
Achieves high precision temperature measurement across a wide range without needing multiple devices, maintaining linearity and reducing costs by using a single structure with interchangeable neutral density filters, ensuring accuracy up to 1000°C with minimal variance.
Implementation Method 1
a neutral density filter, used for attenuating an intensity of thermal radiation from a target object
Implementation Method 2
a temperature sensing unit, disposed in the optical base and used for sensing a target object temperature to obtain a measured temperature value
Data Source
AI summary
An accurate temperature measurement structure of a wide temperature range includes: a lens set; an optical base, having a neutral density slot and being fixed with the lens set by a first screw; a mask shutter assembly, fixed with the optical base by a second screw; and a temperature sensing unit, for sensing a target object temperature so as to obtain a measured temperature value, the temperature sensing unit performing a temperature normalization correction when the accurate temperature measurement structure of the wide temperature range is in a power-on stage to obtain a signal strength value, setting a plurality of signal conditions according to the signal strength value to obtain a dynamic linearity strength value and accordingly determining an extreme value region, so as to determine whether to add a neutral density filter to the neutral density slot.