Tilted Detector Window Spectrograph Avoiding Interference
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Solution Overview
Problem
Conventional spectrographs face interference spectra issues due to multiple reflections at the detector window, which degrade signal-to-noise ratio and spectral resolution, and existing methods to mitigate this either compromise spectral resolution or are costly.
Innovation Solution
A spectrograph with a tilted detector window, where the window is inclined at an angle between 0° and 45° relative to the detection plane, along with optional inclinations of the detector, filter, or grating, to direct interference beams away from the sensitive surface without reducing spectral resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the detector window is tilted to avoid interference spectra, then the signal-to-noise ratio is improved, but the spectral resolution is decreased
Solution Approach 1:
The patent introduces a new degree of freedom by tilting the detector window at an angle relative to the detection plane, separating the interference rejection function from the spectral detection function. This dimensional change allows interference beams to be directed away from the detector while maintaining the optical path for spectral resolution.
Solution Approach 2:
The patent separates the window function into two independent components: the detector window and the detection plane. By tilting only the window and not the entire detector assembly, the patent segments the interference rejection function from the spectral detection function, allowing each to be optimized independently.
2Object-generated harmful factors
If the detector is inclined to direct interference beams outside the sensitive surface, then interference spectra are reduced, but the spectral resolution is greatly decreased
Solution Approach 1:
The patent applies local quality by tilting only the window portion that causes interference, while keeping the detector's sensitive surface and optical alignment intact. This localized modification targets the interference problem without affecting the overall spectral detection quality.
3Object-generated harmful factors
If multiple inclining methods are used together to avoid interference spectra, then the background noise is improved, but the spectral resolution is greatly decreased
Solution Approach 1:
The patent applies partial action by using only the window tilting method rather than combining multiple inclining methods. This single targeted intervention provides sufficient interference rejection without the cumulative negative effects on spectral resolution that would result from multiple simultaneous modifications.
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
Effectively avoids interference spectra superposition without compromising spectral resolution, enhancing instrument performance in a simple and cost-effective manner.
Implementation Method 1
a grating able to diffract the light beam transmitted through the entrance slit and to generate a diffracted light beam and a spectrum
Implementation Method 2
a part of the diffracted light beam generating reflections on the window or between the window and the sensitive surface of the detector
Data Source
AI summary
The invention concerns a spectrograph with a tilted detector window comprising a light source (1), an entrance slit (3), a grating (4), a detector (5) comprising a window through which the light beam diffracted by the grating (4) is transmitted, a part of the diffracted light beam generating reflections on the window or between the window and sensitive surface of the detector (5) and at least a means for inclining able to avoid interference spectra. According to the invention, the at least a means for inclining able to avoid interference spectra comprises the detector window (6, 11) which is an inclined detector window (11).