Graded Blaze Angle Grating for Array Detector Coupling
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Solution Overview
Problem
Existing spectroanalytical systems face limitations in versatility and efficiency, particularly at high numerical apertures, due to fixed wavelength configurations and the challenge of coupling high refractive index media with array detectors, leading to reduced diffraction efficiency and flexibility in spectral analysis.
Innovation Solution
A graded blaze angle grating system is introduced, coupled with a wedge-like optical conditioner having a flat exit surface parallel to the grating vertex tangent, allowing for progressive grading of blaze angles and optimal radiation intensity across a spectral region, enabling efficient coupling with flat array detectors and minimizing angles of incidence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed wavelength configuration with point detectors is used, then the system can achieve high diffraction efficiency at specific wavelengths, but the system lacks versatility in wavelength selection and cannot accommodate array detectors
Solution Approach 1:
The grating blaze angle is made variable across different regions rather than fixed, allowing the system to dynamically adapt to different wavelength requirements. The graded blaze angle grating enables different portions of the grating to optimize for different wavelengths, providing versatility while maintaining efficiency.
Solution Approach 2:
Different regions of the grating are assigned different blaze angles optimized for specific wavelength ranges. This local optimization allows each portion of the grating to maximize diffraction efficiency for its designated wavelength band while the overall system achieves broad spectral coverage and versatility.
2Measurement precision
If a curved grating surface is used to focus radiation, then the system can achieve high resolution, but array detectors cannot be properly coupled due to the curved focal surface
Solution Approach 1:
The patent transitions from a curved focal surface in three-dimensional space to a flat detector plane by introducing a wedge-shaped optical conditioner. This dimensional transformation allows the curved grating to maintain its focusing capability while the flat detector array can be easily coupled to the system.
Solution Approach 2:
A wedge-shaped optical conditioner acts as an intermediary between the curved grating and the flat detector array. This intermediate element transforms the curved focal surface into a flat plane, enabling proper coupling of array detectors while preserving the high resolution benefits of the curved grating.
3Measurement precision
If thermal detectors are placed in thermal contact with the optical conditioner, then the detectors can detect infrared radiation, but the detectors are influenced more by the conditioner temperature than by the radiation
Solution Approach 1:
A non-thermally conductive spacer acts as an intermediary between the optical conditioner and the thermal detector elements. This spacer prevents direct thermal contact, blocking the harmful thermal interference from the conditioner while still allowing the detectors to receive optical radiation through radiation pickup holes.
Solution Approach 2:
The non-thermally conductive spacer functions as a thermal barrier film that separates the hot optical conditioner from the sensitive thermal detectors. This thin film structure maintains optical functionality while providing thermal isolation to eliminate temperature interference.
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 graded blaze angle grating system enhances diffraction efficiency and versatility by maintaining high radiation intensity and throughput across a spectral region, accommodating flat array detectors and improving spectral analysis capabilities.
Implementation Method 1
a grating in the first path having periodic faceted grooves for spatially separating the radiation as a function of wavelength
Implementation Method 2
an optical conditioner disposed in the first path between the grating and the multielement detector... having a tangent to the vertex of an exit surface parallel or substantially parallel to a tangent at the vertex of the grating to minimize angles of incidence
Data Source
AI summary
A spectroanalytical system for receiving radiation to be analyzed along a first path includes a grating in the first path with periodic faceted grooves for spatially separating the radiation as a function of wavelength. The blaze angles of the faceted grooves are progressively graded. A multielement detector detects radiation spatially separated by the grating. An optical conditioner is disposed in the first path between the grating and a multielement detector.