Orthogonal Imaging Spectrometers for Optical Source Classification
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Solution Overview
Problem
Current methods for locating and classifying optical radiation face challenges in accuracy due to false detections and difficulties in identifying diffraction profiles, particularly in environments with optical clutter and varying angles of incidence.
Innovation Solution
The use of orthogonally oriented gratings and detectors, which rotate the diffracted radiation by 90 degrees relative to each other, allows for the generation of duplicate diffraction profiles that must match on both detectors to confirm a detection, thereby increasing accuracy and minimizing false positives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single grating and detector are used for detecting optical radiation, then the device complexity is low, but the measurement precision and reliability are reduced due to false detections from optical clutter
Solution Approach 1:
The detection system is segmented into multiple independent detection channels, each with its own grating and detector. The first detector captures diffraction profiles in a first direction while the second detector captures profiles in a second direction orthogonal to the first. This segmentation allows independent verification of diffraction profiles, reducing false detections from optical clutter while maintaining manageable device complexity through modular architecture.
Solution Approach 2:
The invention adds a dimensional aspect to detection by using two detectors oriented at different angles (first direction and second direction orthogonal thereto). This multi-dimensional approach allows the system to verify diffraction profiles from multiple geometric perspectives, significantly improving measurement precision by eliminating false positives that would appear consistent in only a single detection dimension.
2Reliability
If multiple gratings and detectors are used to verify diffraction profiles, then false detections are reduced, but the device complexity increases
Solution Approach 1:
The system is divided into multiple independent detection channels with each channel containing a grating and detector combination. This segmentation provides redundant verification paths where diffraction profiles must be consistently detected across multiple channels, thereby improving reliability without creating a monolithic complex system that would be difficult to manage and maintain.
Solution Approach 2:
By introducing detection in multiple geometric dimensions (orthogonal directions), the system achieves enhanced reliability through multi-perspective verification. The orthogonal arrangement of gratings and detectors creates independent verification pathways that reduce false detections while maintaining a structured, manageable system architecture rather than arbitrary complexity.
3Measurement precision
If orthogonally oriented gratings and detectors are used, then the accuracy of determining two-dimensional angle of incidence is improved, but the device complexity and difficulty of operation increase
Solution Approach 1:
The orthogonal arrangement of gratings and detectors naturally captures diffraction profiles in two perpendicular directions, enabling accurate determination of two-dimensional angle of incidence. This multi-dimensional geometric configuration provides complete angular information without requiring complex mechanical scanning or adjustment mechanisms, thereby improving measurement precision while keeping operation relatively simple through fixed geometric relationships.
Solution Approach 2:
The use of orthogonally oriented detection channels creates an asymmetric detection geometry that is optimized for two-dimensional angle measurement. This asymmetric arrangement, with detectors at right angles to each other, provides unique geometric advantages for determining incidence angles in both horizontal and vertical planes simultaneously, improving precision without requiring symmetric complexity in all directions.
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 approach enhances the accuracy of detecting and classifying optical sources by ensuring that both detectors independently verify the presence of a diffraction profile of interest, reducing errors from optical clutter and improving the determination of the two-dimensional angle of incidence.
Implementation Method 1
at least two gratings for diffracting radiation received from an optical source, for which a first of the gratings is oriented relative to a second of the gratings such that the diffracted radiation created by a first of the gratings is rotated ninety degrees relative to the diffracted radiation created by a second of the gratings
Data Source
AI summary
Disclosed are methods and systems for locating and classifying optical sources. In one aspect, a pair of imaging spectrometers is orthogonally oriented relative to an optical axis to accommodate simultaneous creation of two diffraction profiles for each imaged optical source. Such orientation increases the accuracy of detecting diffraction profiles of interest (“DPI”), as a DPI will not be declared unless it is sensed by both spectrometers. Furthermore, the spectrometers' orientation allows data such as a two-dimensional angle of incidence to be collected from an identified DPI without identification of either DPI's 0th order ray segment, thereby increasing the accuracy of the collected data. Such increased accuracy in both data determinations allows optical sources to be more accurately located and classified as information such as wavelength, amplitude, etc. may be calculated from the detected DPI with a greater degree of accuracy. Furthermore, false DPI detections are minimized.