Calibration Device with Diffuse Scattering Layer
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Solution Overview
Problem
Conventional light measurement devices face inaccuracies in calibration due to relative movement between the reference standard and the specimen, leading to positioning errors, optical changes, and environmental disturbances, which result in significant errors in measured light intensities and affect the accuracy of spectral energy distribution measurements.
Innovation Solution
The device can be switched between measuring and calibrating positions without moving, with the light-exit opening and diffusely scattering layer aligned differently to maintain constant distances and inclinations, allowing a reference standard to be positioned permanently, and the photo-detectors to switch functions, ensuring accurate calibration by maintaining identical distances and orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the reference standard is moved in front of or instead of the specimen into the detection beam path for calibration, then calibration can be performed, but positioning errors occur due to relative movement, leading to inaccuracies in measured light intensities
Solution Approach 1:
Instead of moving the reference standard into the detection beam path, the patent inverts the approach by moving the detection beam path (hollow body) to different positions: a first position for specimen measurement and a second position for reference standard measurement. This eliminates positioning errors by keeping both the specimen and reference standard fixed while changing the detector's position between measurements.
Solution Approach 2:
The patent applies dynamics by making the hollow body movable between two fixed positions (first position for specimen, second position for reference standard) while keeping the specimen and reference standard stationary. This dynamic repositioning of the detection system allows calibration without the positioning errors that would result from moving the reference standard itself.
2Measurement precision
If the measuring device is moved in parallel into a calibrating position away from the specimen, then calibration can be performed, but the reference standard is not always at the same distance from the light-exit opening, leading to large errors in calibration measurement
Solution Approach 1:
Rather than moving the entire device away from the specimen for calibration, the patent inverts the approach by providing two fixed positions for the hollow body: a first position at a first distance from the specimen for measurement, and a second position at a second distance from the reference standard for calibration. This ensures consistent distances are maintained while allowing calibration.
Solution Approach 2:
The patent segments the measurement process into two distinct spatial configurations: one for specimen measurement and one for reference standard calibration. By separating these functions into different fixed positions of the hollow body, the system maintains optimal distances for each measurement type without compromising the other.
3Measurement precision
If the reference standard is handled during calibration, then calibration measurements can be performed, but the reference standard can become soiled, affecting calibration accuracy
Solution Approach 1:
The patent extracts the reference standard from the measurement environment by placing it in a separate, protected location. The hollow body is moved to a second position to access the reference standard without requiring physical handling, thereby preventing contamination while enabling calibration measurements.
4Measurement precision
If the hollow body is moved between measuring and calibrating positions, then accurate calibration can be achieved, but the device complexity increases
Solution Approach 1:
The patent introduces a single movable component (the hollow body) that can be positioned in two fixed locations: a first position for specimen measurement and a second position for reference standard calibration. This minimal dynamic element enables accurate calibration without requiring complex multi-component systems.
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 enables higher accuracy in measurement and calibration by minimizing positioning errors and optical changes, maintaining consistent measurement geometry, and protecting the reference standard from environmental influences, thus improving the reliability of spectral energy distribution measurements.
Implementation Method 1
the light from the light source scattered on/in the inner layer can exit from the hollow body through the light-exit opening. At a specimen located in front of the light-exit opening, the light is remitted, at least partially, to the light-exit opening (back-scattered and/or reflected there)
Implementation Method 2
a second photo-detector is provided for the detection of the light that is scattered within the hollow body on/in the diffusely scattering layer
Data Source
AI summary
A device includes a hollow body having a light-exit opening configured to illuminate a specimen, an interior of the hollow body comprising a diffusely scattering layer. The device also includes a light source configured to illuminate the diffusely scattering layer, a first photo-detector aligned along a first detection axis, and a second photo-detector aligned along a second detection axis. The device is configured to measure referenced measurements of reflected light.