Reflection Characteristic Measuring Apparatus Calibration Using Pre-Acquired Spectral Data
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Solution Overview
Problem
Conventional reflection characteristic measuring apparatuses face challenges in achieving high-precision measurements due to changes in emission intensity of incandescent lamps, particularly when driven by constant voltage, as they require stabilization time, which can lead to prolonged measurement times and reduced precision without a reference spectral section.
Innovation Solution
The apparatus and method involve obtaining multiple standard spectral characteristics and calibration data related to the emission characteristics of the light source, selecting an optimum standard spectral characteristic or calibration data, and using this data to calculate the spectral reflection characteristic of a sample, thereby correcting for changes in spectral intensity without a reference spectral section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the incandescent lamp is driven by constant voltage to reduce cost and simplify the driving circuit, then the device complexity is reduced, but the emission intensity changes over time causing measurement precision to deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-acquiring multiple standard spectral characteristics corresponding to different reference values (emission intensities) before actual measurement. This allows the system to select the appropriate pre-acquired standard spectral characteristic that matches the current emission intensity, eliminating the need for real-time stabilization waiting and correcting measurement results using the matched standard spectral characteristic.
2Productivity
If the measurement is performed immediately after turning on the incandescent lamp to reduce measurement time, then productivity is improved, but the emission intensity is unstable causing measurement precision to deteriorate
Solution Approach 1:
The patent applies parameter changes by utilizing multiple standard spectral characteristics corresponding to different reference values (emission intensities) acquired at different times after lamp activation. The system detects the current reference value and selects the matching standard spectral characteristic, enabling accurate measurements regardless of when the measurement is performed after lamp activation.
3Measurement precision
If a reference spectral section is used to correct emission intensity changes, then measurement precision is improved, but the device complexity and cost increase
Solution Approach 1:
The patent applies copying by creating multiple standard spectral characteristics that replicate the relationship between reference values and spectral characteristics under different emission intensity conditions. Instead of using a physical reference spectral section to measure and correct emission intensity in real-time, the system copies the essential correction information into pre-acquired standard spectral characteristics that can be selected and applied based on the current reference value.
4Measurement precision
If the system waits for the incandescent lamp to stabilize before measurement to ensure precision, then measurement precision is improved, but the measurement time increases causing productivity to deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-acquiring multiple standard spectral characteristics corresponding to different reference values (emission intensities) that would occur at different stabilization states. This allows the system to perform measurements immediately without waiting for stabilization, as the appropriate correction data is already available for selection based on the current reference value.
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 allows for high-speed and high-precision reflection characteristic measurements by shortening the stabilization wait time and correcting for light source fluctuations, enabling efficient calibration without the need for expensive reference spectral sections.
Implementation Method 1
a sample 903 is illuminated with a light flux 902a from an incandescent lamp 902 which is driven by a driving circuit 901
Implementation Method 2
The spectral device 905 measures a spectral intensity of the normal direction component 903 in the sample reflected light
Data Source
AI summary
In a reflection characteristic measuring apparatus 10 and a method for calibrating the reflection characteristic measuring apparatus, multiple standard spectral characteristics, or multiple calibration data based on the multiple standard spectral characteristics are obtained in advance with corresponding reference values relating to an emission characteristic of a light source 21. An optimum standard spectral characteristic or an optimum calibration data is selected from the multiple standard spectral characteristics or the multiple calibration data obtained. A spectral reflection characteristic of a sample is calculated using the selected standard spectral characteristic or the selected calibration data.