Spectrometry Device With Segmented Detection For Stray Light Control
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Solution Overview
Problem
Spectroscopic measurement devices using the Dyson optical system face challenges in maintaining wavelength resolution and detection accuracy due to stray light generation and increased aberration when the distance between the light entrance portion and the optical detector is increased to avoid stray light in the receiving region.
Innovation Solution
The device incorporates a light receiving region with first and second light receiving regions arranged perpendicular to the wavelength axis, with the stray light region located in the first region, and uses different exposure times for spectral data acquisition in each region, along with an analyzer to generate spectral data by offsetting stray light regions from high-intensity bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between the light entrance portion and the optical detector is increased to avoid stray light in the light receiving region, then detection accuracy is improved, but aberration generated by the lens increases and wavelength resolution decreases
Solution Approach 1:
The light receiving region is divided into multiple regions (first light receiving region and second light receiving region) arranged in different directions relative to the wavelength axis. The stray light region is specifically positioned in the first light receiving region, allowing the second light receiving region to receive spectral images without stray light interference, thus maintaining detection accuracy while avoiding the need to increase the overall distance that would cause aberration
Solution Approach 2:
Instead of solving the stray light problem by increasing distance along the optical axis (one dimension), the patent utilizes the lateral dimension perpendicular to the wavelength axis to separate the stray light region from the spectral image receiving region. This dimensional approach allows both high wavelength resolution (short distance) and high detection accuracy (stray light avoidance) to be achieved simultaneously
2Object-affected harmful factors
If the distance between the light entrance portion and the optical detector is increased to position the stray light region outside the light receiving region, then stray light interference is reduced, but the optical path length increases causing increased aberration
Solution Approach 1:
Different regions of the light receiving region are assigned different functions: the first light receiving region is positioned to receive stray light, while the second light receiving region is positioned to receive spectral images free from stray light. This local differentiation allows the system to handle stray light locally without affecting the overall optical path length or causing increased aberration in the spectral measurement region
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 effectively suppresses decreases in wavelength resolution and detection accuracy by reducing aberration and eliminating stray light influence, ensuring accurate spectral data acquisition across all wavelength bands.
Implementation Method 1
a reflective diffraction grating configured to disperse the light to be measured incident from the light entrance portion
Implementation Method 2
a lens configured to guide the light to be measured incident from the light entrance portion to the reflective diffraction grating and to form a spectral image of the light to be measured dispersed by the reflective diffraction grating
Data Source
AI summary
The spectroscopic measurement device includes a light entrance portion, a reflective diffraction grating, an optical detector, a lens, and an analyzer. The optical detector outputs first spectral data of light to be measured by receiving a spectral image in a first exposure time in a first light receiving region, and outputs second spectral data of the light to be measured by receiving the spectral image in a second exposure time longer than the first exposure time in a second light receiving region arranged side by side with the first light receiving region. The analyzer generates spectral data based on the first spectral data and the second spectral data. The optical detector is disposed so that a stray light region, in which stray light gathers, is located in the first light receiving region.