Transmissive Optical Member Sloped Face Spectroscopic Measurement
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Solution Overview
Problem
Existing spectroscopic measurement devices face challenges in maintaining accuracy due to environmental disturbances and mechanical errors, and struggle to correctly measure spectral characteristics when there are no noticeable spatial changes or when optically disturbing elements are present.
Innovation Solution
A spectroscopic measurement device that includes a dividing optical system, an imaging optical system, an optical path length difference providing means, a detector with multiple pixels, and a processor to acquire and Fourier-transform interferograms, along with a conjugate plane imaging optical system and a periodicity providing means to introduce spatial periodic modulation, allowing for accurate spectral analysis even without texture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reflective optical system with fixed and movable mirror units is used to obtain spectral characteristics through interference, then spectral measurement capability is achieved, but the device becomes sensitive to environmental disturbances and mechanical errors that change the relative angle of the reflecting surfaces
Solution Approach 1:
The patent replaces the mechanical reflective optical system (fixed mirror unit and movable mirror unit) with an all-transmissive optical system consisting of a first transmissive optical member and a second transmissive optical member. This substitution eliminates the mechanical components that are sensitive to environmental disturbances and mechanical errors, thereby maintaining spectral measurement capability while improving reliability against such disturbances.
Solution Approach 2:
The patent extracts and removes the reflective components (mirror units) from the optical system, replacing them with transmissive components. This extraction of the problematic mechanical reflective elements eliminates the source of sensitivity to environmental disturbances while preserving the core function of obtaining spectral characteristics through interference of light beams.
2Manufacturing precision
If the reflecting surfaces of mirror units are accurately oriented during assembly, then correct interference imaging is achieved, but the relative angle may change due to environmental factors or mechanical errors
Solution Approach 1:
The patent replaces the mechanical reflective system requiring precise angular alignment with transmissive optical members that do not require the same degree of angular precision. The transmissive system is inherently more stable against environmental factors and mechanical errors that would otherwise change the relative angle between components.
Solution Approach 2:
The patent changes the fundamental optical parameter from reflection to transmission. This parameter change transforms the optical interaction mechanism, eliminating the need for precise angular orientation of reflecting surfaces while maintaining the ability to produce interference patterns for spectral measurement.
3Ease of operation
If light is transmitted through a sample with texture, then measurement is possible, but the distribution of interference light is affected by diffraction angle differences, preventing correct concentration measurement
Solution Approach 1:
The patent replaces the reflective optical system with a transmissive system, which fundamentally changes how light interacts with the sample. The transmissive approach reduces the impact of surface texture on diffraction angle variations, allowing for more accurate concentration measurements while maintaining ease of operation on textured surfaces.
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 device reduces the influence of disturbances and mechanical errors, enabling accurate spectral characteristic measurement by generating higher-order diffraction light and eliminating the impact of texture on the measurement, thus providing reliable results across various conditions.
Implementation Method 1
a transmissive optical member composed of a first transmissive part having an entrance face and an exit face parallel to each other and a second transmissive part located next to the first transmissive part and shaped like a wedge having an entrance face and an exit face one of which is sloped relative to the other
Implementation Method 2
an imaging optical system for making the first measurement beam and the second measurement beam interfere with each other
Implementation Method 3
an objective lens for collimating a measurement beam emitted from each of a plurality of measurement points located within a measurement area of an object to be measured
Data Source
AI summary
A spectroscopic measurement device includes: a dividing optical system for dividing a measurement beam emitted from each of a plurality of measurement points located within a measurement area of an object to be measured, into a first measurement beam and a second measurement beam; an imaging optical system; an optical path length difference providing means; a detector including a plurality of pixels; a processor for acquiring an interferogram of a measurement point of the object to be measured; a conjugate plane imaging optical system located between the object to be measured and the dividing optical system; and a periodicity providing means located on the conjugate plane.