Spectroscopic Detector Stray Light Attenuation
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Solution Overview
Problem
Conventional micro Raman apparatuses lack measures to prevent stray light detection, which affects the signal-to-noise ratio of the detector.
Innovation Solution
A spectroscopic detector design featuring a camera lens with a movable lens tube and a labyrinthine structure formed by the interaction between the camera lens and housing through holes, which attenuates stray light by multiple reflections before it reaches the image sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a simple detector structure is used, then device complexity is reduced, but stray light detection cannot be inhibited
Solution Approach 1:
The camera lens is inserted through the first through-hole in the first housing, with its emission end extending into the housing interior. The lens tube is nested within the housing structure, creating a labyrinthine path that traps stray light through multiple reflections while maintaining a compact overall design.
Solution Approach 2:
The patent creates a three-dimensional labyrinthine structure by inserting the camera lens at an angle relative to the optical axis, causing stray light to undergo multiple reflections in different spatial dimensions before being blocked from reaching the image sensor.
2Object-affected harmful factors
If the camera lens is inserted deeply into the housing, then stray light attenuation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies different dimensional constraints to different parts of the camera lens: the outer diameter at the emission end is specifically constrained to be smaller than the first through-hole diameter by 0.1 to 1.0 times the housing thickness, while the inner diameter at the incidence end has different constraints. This localized dimensional control achieves stray light attenuation without requiring uniform precision throughout the entire lens structure.
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 design effectively inhibits stray light detection, thereby improving the signal-to-noise ratio of the image sensor by attenuating stray light through multiple reflections within the housing structure.
Implementation Method 1
a camera lens (43) having an emission end (43b) inserted in the first through hole (45a)
Implementation Method 2
the emission end (43b) is inserted in the first through hole (45a)... the image sensor (44) faces the emission end (43b) in the direction of an optical axis of the camera lens (43)
Implementation Method 3
a labyrinthine structure formed by the interaction between the camera lens and housing through holes, which attenuates stray light by multiple reflections
Data Source
AI summary
A spectroscopic detector comprises a first housing, a second housing, a camera lens housed in the first housing, and an image sensor housed in the second housing. The first housing has a first through hole formed therein. The second housing has a second through hole formed therein. The second housing is attached to the first housing so as to allow for communication between an inside of the second housing and an inside of the first housing via the first through hole and the second through hole. In a state where the second housing is attached to the first housing, a periphery of the second through hole is located inside a periphery of the first through hole.