Angled Raman Probe Geometry for Coating Surface Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional Raman spectrometers face challenges in obtaining accurate measurements on surfaces with various substances, such as coating surfaces, due to varying measurement quality and interference from substances on or under the surface.
Innovation Solution
A Raman measurement device with a housing, optical module, and measuring probe is designed, where the measuring probe is angled between 5 degrees and 60 degrees relative to the housing, and a light shield is used to reduce interference, allowing for improved focusing and reception of Raman scattered light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional Raman spectrometer with a probe is used for distal sampling measurement, then the measurement can be performed on surfaces, but the measurement quality varies due to different substances contained on or under the surface
Solution Approach 1:
The patent changes the geometric parameters of the measurement system by setting the measuring probe at an inclined angle (5-60 degrees) relative to the housing, and optimizes the effective focusing distance (7-9 mm) to improve measurement quality and reduce interference from substances on or under the surface
2Measurement precision
If the measuring probe is positioned to focus on the surface, then the Raman scattered light can be received, but interference lights excited or scattered from substances on or under the surface are also received
Solution Approach 1:
The patent introduces asymmetry by positioning the measuring probe at an inclined angle rather than perpendicular to the surface, which creates an asymmetric light reception pattern that favors the desired Raman scattered light while reducing reception of interference lights from substances on or under the surface
Solution Approach 2:
The patent converts the potential harm of receiving scattered light from substances into a benefit by using the inclined angle to selectively receive Raman scattered light while excluding interference lights, turning what could be noise into a filtering mechanism
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 enhances measurement accuracy and efficiency by increasing the area of the surface illuminated and reducing interference from substances on or under the surface, as demonstrated by experimental data on coating surfaces.
Implementation Method 1
an emitted light from the laser light source exits an open end of the measuring probe and is focused on a surface to be detected
Implementation Method 2
the open end receives a Raman scattered light excited from the surface
Data Source
AI summary
A proposed Raman measurement device has a housing, an optical module, and a measuring probe. The measuring probe is connected to the optical module which is installed in the housing. A part of the measuring probe protrudes from the housing. An open end of the measuring probe outputs an emitted light from a laser light source in the optical module and receives the Raman scattered light excited from a surface to be detected. The axial centerline of the measuring probe and any parallel line in the length direction of the housing include an angle of 15° to 50° and the effective focusing distance between the open end of the measuring probe and the surface to be detected is 7 mm to 9 mm.