Light Absorbing Body for Reflected Light Removal
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Solution Overview
Problem
Existing methods for visualizing particles suspended in the air, such as in clean rooms, face challenges in achieving high sensitivity due to reflected light from surfaces and obstacles, which limits the detection of small particles and is not cost-effective for large environments.
Innovation Solution
An apparatus comprising a light introduction unit, a light reflective or absorptive unit, and a light sealing unit with a light absorption member, which directs and absorbs reflected light to prevent it from entering the measurement space, allowing for the emission of a sheet-like beam of light that enhances visualization sensitivity without environmental interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sheet-like beam of light is emitted to measure suspended particles, then the detection range is improved, but reflected light from surfaces increases and reduces detection sensitivity
Solution Approach 1:
The patent extracts and removes the harmful reflected light from the measurement space by introducing a light absorbing body that selectively absorbs light in the wavelength range of the light source. This separates the useful scattered light from particles from the harmful reflected light from surfaces, enabling high-sensitivity detection across a wide particle size range.
Solution Approach 2:
The light absorbing body acts as an intermediary element between the light source and the measurement space. It absorbs excess light and reflected light before they can interfere with particle detection, mediating the interaction between illumination and measurement to maintain high sensitivity.
2Measurement precision
If black paper or simple black surfaces are used to reduce reflected light, then detection sensitivity is improved, but the structure is not portable and cannot be used in large environments
Solution Approach 1:
The light absorbing body is designed with a light introducing portion and a light absorbing portion that can function together in various environments. The structure can be deployed in small measurement spaces and large environments alike, providing universal applicability while maintaining portability and achieving high detection sensitivity through its multi-functional design.
3Measurement precision
If tubular elements are used to reduce reflected light, then visualization sensitivity is improved, but the cost increases making it impractical for portable devices
Solution Approach 1:
The patent replaces expensive tubular elements with a simpler, more cost-effective light absorbing body that achieves the same light absorption function. This simpler structure reduces manufacturing costs while maintaining the ability to absorb reflected light effectively, making the device practical for portable and periodic use in clean room monitoring.
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
The apparatus significantly increases the detectable range of particle diameters from 50 um to 0.1 um, achieving a 99% reduction in reflected light illuminance, thereby improving detection sensitivity and making it suitable for portable use in various environments.
Implementation Method 1
a light absorbing body having a light introducing portion and a light absorbing portion, which absorbs light in a wavelength range of light from the light source
Implementation Method 2
a light reflecting body disposed opposite to the second aperture, which allows light having traveled through the second aperture to reflect toward a predetermined direction
Data Source
AI summary
An apparatus for removing reflected light is provided, which is used for a measuring device that emits a sheet-like beam of light onto suspended particles and measures light scattered from the suspended particles. The apparatus includes a light introduction unit, a light reflective unit, a light sealing unit and a light absorption member. The light introduction unit has a first aperture, a second aperture, and a passage through which the light travels from the first aperture to the second aperture. The light reflective unit disposed opposite to the second aperture allows the light having traveled through the second aperture to reflect toward a predetermined direction so as to prevent the light from returning into the second aperture. The light sealing unit in which the light reflective unit is disposed has an inner wall to confine the light reflected from the light reflective unit.