Fiber Grating Demodulation System for Spectral Resolution
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Solution Overview
Problem
Current fiber grating demodulation systems face limitations in achieving high spectral resolution due to the limited number of pixels in linear array sensors, which restricts the spatial resolution of the spectrum.
Innovation Solution
A fiber grating demodulation system comprising a laser pump source, wavelength division multiplexer, fiber Bragg grating, diaphragm, slit, collimating mirror, light splitting grating, and linear array detector, where adjustable components like the slit, collimating mirror, light splitting grating, and linear array detector are fine-tuned using piezoelectric elements to optimize the light path and enhance spectral resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a linear array sensor with limited pixels is used, then the device complexity is reduced and manufacturing cost is lowered, but the spectral resolution and spatial resolution of the spectrum are limited
Solution Approach 1:
The patent introduces adjustable components (slit width, mirror angles, grating positions) that can be dynamically tuned to optimize spectral resolution. The slit width can be adjusted to control the incident light angle range, mirrors can be rotated to change light path geometry, and gratings can be positioned at different angles - all allowing the system to adapt to different resolution requirements without changing the detector array itself.
Solution Approach 2:
The system optimizes spectral resolution by adjusting key parameters: slit width (controlling light divergence), mirror rotation angles (changing optical path geometry), and grating diffraction angles (affecting spectral dispersion). These parameter changes allow the same detector array to achieve different effective resolutions by optimizing the optical configuration rather than increasing detector pixel count.
2Measurement precision
If the number of pixels in the linear array sensor is increased to improve spectral resolution, then measurement precision improves, but device complexity and manufacturing cost increase
Solution Approach 1:
Instead of relying on a fixed high-pixel-count detector, the system uses dynamically adjustable optical components (variable slit width, rotatable mirrors, movable gratings) to optimize the spectral distribution across the detector pixels. This allows the same detector to achieve optimal spatial resolution for different spectral ranges without requiring more pixels.
Solution Approach 2:
The patent changes optical parameters (slit width, mirror angles, grating positions) to optimize the mapping between spectral features and detector pixel positions. By adjusting these parameters, the system maximizes the use of available pixels to achieve the required spatial resolution without adding more pixels to the detector array.
3Measurement precision
If fixed optical components are used in the demodulation system, then device complexity is reduced, but the ability to optimize spectral resolution and adapt to different measurement conditions is limited
Solution Approach 1:
The system incorporates adjustable components (slit width control, mirror rotation mechanisms, grating position adjustment) that can be modified to optimize spectral resolution for different measurement conditions. These dynamic adjustments allow operators to fine-tune the system for specific applications while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent implements feedback mechanisms where the system automatically adjusts optical parameters based on detected spectral information. The adjustable slit, mirrors, and gratings can be controlled through feedback loops that optimize spectral resolution without requiring complex manual intervention, thereby maintaining ease of operation while achieving high measurement precision.
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 allows for finer interference stripes at smaller intervals, significantly improving the spectral resolution and imaging spectrum resolution, even with a fixed grating resolution, by adjusting the position and angle of key components to align the spectrum imaging position with minimum pixel intervals.
Implementation Method 1
a fiber grating demodulation system... a fiber Bragg grating... light emitted from the laser pump source is multiplexed by the wavelength division multiplexer and then enters the fiber Bragg grating
Implementation Method 2
after passing through the slit, the injected light is reflected by the collimating mirror, the light splitting grating, and the imaging focus mirror in sequence
Data Source
AI summary
A fiber grating demodulation system for enhancing spectral resolution of a detector array, includes a laser pump source, a wavelength division multiplexer, a fiber Bragg grating, a diaphragm, a slit, a collimating mirror, a light splitting grating, an imaging focus mirror, and a linear array detector. The laser pump source, the wavelength division multiplexer, and the fiber Bragg grating are connected in sequence, and the wavelength division multiplexer is connected to the diaphragm. Light emitted from the laser pump source is multiplexed by the wavelength division multiplexer and then enters the fiber Bragg grating. A reflection spectrum of the fiber Bragg grating enters the slit of the fiber grating demodulation system as injected light. After passing through the slit, the injected light is reflected by the collimating mirror. The light splitting grating, and the imaging focus mirror in sequence, and is finally converged to the linear array detector.