Tubular Light Shielding for Accurate Spectroscopic Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing spectroscopic measurement devices suffer from stray light entry into the optical fiber, which decreases the accuracy of spectral data due to the lack of measures to block light other than the transmitted light from the target object.
Innovation Solution
Incorporating a tubular member between the article and the optical fiber, with an opening positioned on the article side of the incidence end, and applying a low-reflective surface treatment to the inner wall of the tubular member to absorb stray light, and optionally shaping the opening end to minimize reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If no tubular member is provided, then the device structure is simple, but stray light enters the optical fiber and measurement precision deteriorates
Solution Approach 1:
A tubular member is introduced as an intermediary component between the article and the optical fiber. This tubular member blocks stray light from entering the optical fiber while allowing transmitted light to pass through to the detection unit, thereby improving measurement precision without significantly complicating the overall device structure
Solution Approach 2:
The harmful stray light is extracted or removed from the optical path by the tubular member, which selectively blocks off-axis light while permitting on-axis transmitted light to reach the optical fiber, thus improving spectral data accuracy
2Measurement precision
If the opening of the tubular member is large, then light transmission is good, but stray light enters and measurement precision deteriorates
Solution Approach 1:
The tubular member creates a localized controlled optical environment by blocking stray light from specific directions while maintaining a clear path for transmitted light. The opening size is optimized to provide sufficient light transmission while preventing stray light entry, achieving local quality control in the optical path
3Measurement precision
If the opening end of the tubular member is sharply formed, then manufacturing is simple, but stray light reflection increases and measurement precision deteriorates
Solution Approach 1:
The inner wall surface of the tubular member is preliminarily treated with a light-absorbing coating before final assembly. This preliminary action prevents stray light reflection at the opening end and along the tubular interior, improving measurement precision while the tubular member itself remains simple in shape for easy manufacturing
Solution Approach 2:
The optical properties of the tubular member's inner wall surface are changed by applying a light-absorbing coating, transforming it from a reflective surface to an absorptive surface. This parameter change eliminates stray light reflections without requiring complex geometric modifications to the tubular member 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
Prevents stray light entry into the optical fiber, maintaining the accuracy of spectral data by blocking and attenuating stray light, and allowing for adjustable tubular member dimensions to accommodate different article types.
Implementation Method 1
the tubular member blocks incidence of light other than the transmission light, which is emitted from the light source unit and transmitted through the article, on the incidence end of the optical fiber
Implementation Method 2
a surface treatment for absorbing light is performed on an inner wall surface of the tubular member
Implementation Method 3
a surface treatment for absorbing light is performed on an inner wall surface of the tubular member
Implementation Method 4
an optical fiber on which transmission light transmitted through the article is incident and a spectroscope configured to measure a spectral characteristic of the transmission light passing through the optical fiber
Implementation Method 5
a spectroscope configured to measure a spectral characteristic of the transmission light passing through the optical fiber
Data Source
AI summary
A spectroscopic measurement device capable of preventing entry of stray light into an optical fiber and preventing a decrease in accuracy of data of a spectrum of light incident on the optical fiber. The spectroscopic measurement device includes a light source unit, and a light detection unit in which transmission light transmitted through the article is incident on an optical fiber and a spectral characteristic of the transmission light passing through the optical fiber is measured by the spectroscope, in which the light detection unit further includes a tubular member between the article and the optical fiber, and an opening on an end of the tubular member on a side facing toward the article is positioned on the article side with respect to an incidence end of the optical fiber and the transmission light passes through the tubular member from the opening and is incident on the optical fiber.