Spectrometer with Segmented Aperture for High Throughput
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Solution Overview
Problem
Conventional optical spectrometers have limited light gathering power due to narrow entrance slits, which restricts their signal-to-noise ratio (SNR) and measurement speed, and also face challenges in Raman spectroscopy due to high laser-induced sample fluorescence.
Innovation Solution
A spectrometer design featuring an enlarged entrance aperture with spatially encoded slits, coupled with single-pixel detectors, allows for high-throughput detection without requiring uniform illumination, thus enhancing SNR and simplifying the optical design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the entrance slit width is enlarged to increase light gathering power, then the throughput is improved, but the spectral resolution deteriorates
Solution Approach 1:
The entrance aperture is divided into multiple independently controllable segments or zones. By selectively opening/closing specific segments, the system can optimize the balance between throughput and resolution for different measurement conditions, achieving both high light gathering power and spectral resolution simultaneously
Solution Approach 2:
The entrance aperture configuration is made dynamically adjustable rather than fixed. The system can change the effective aperture size and shape in real-time based on the specific measurement requirements, allowing optimization of both throughput and resolution for different spectral bands and signal strengths
2Measurement precision
If a narrow entrance slit is used to maintain spectral resolution, then the measurement precision is improved, but the light gathering power deteriorates
Solution Approach 1:
The system transitions from a single-dimensional slit width control to multi-dimensional aperture control, including variable height, variable width, and variable shape configurations. This additional degree of freedom allows the system to maintain high resolution while gathering more light by optimizing the aperture geometry beyond simple width adjustment
3Reliability
If conventional image sensors are used for time-gated detection, then the detection capability is improved, but the system cost and complexity increase
Solution Approach 1:
The system extracts and utilizes the time-gating capability from specialized expensive sensors and implements it using standard single-pixel detectors combined with temporal encoding. This separates the time-resolution function from the detection hardware, allowing the use of low-cost detectors while maintaining ultrafast time-gated detection capability for fluorescence suppression
Solution Approach 2:
The system replaces mechanical/optical time-gating mechanisms (such as those in ICCD cameras) with electronic/temporal encoding approaches using single-pixel detectors. This substitution eliminates the need for expensive microchannel plates and intensified sensors while achieving the same time-resolution performance
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 design achieves high throughput and SNR, enabling the detection of weak Raman scattered signals and suppressing fluorescence background, while also simplifying the sampling process and reducing equipment costs.
Implementation Method 1
a dispersion and imaging optics configured to create dispersed images of the entrance aperture on a plane of the exit aperture, such that respective images at the different wavelength components are offset by different amounts of displacements along a direction of dispersion
Implementation Method 2
a first collection optics configured to gather a first EM wave energy incident on the entrance aperture to the EM detector
Implementation Method 3
at least one single-pixel detector, each single-pixel detector sensitive to one or more of the wavelength components
Data Source
AI summary
A spectrometer for detecting an electromagnetic (EM) wave spectrum having one or more wavelength components within a spectral band of interest, a method of detecting an electromagnetic (EM) wave spectrum having one or more wavelength components within a spectral band of interest, and a method of constructing the spectrometer. The method comprises the steps of creating dispersed images of an entrance aperture on a plane of an exit aperture, such that respective images at the different wavelength components are offset by different amounts of displacements along a direction of dispersion; gathering a first EM wave energy incident on the entrance aperture to an EM detector; gathering a second EM wave energy that exits the exit aperture to the at least one single-pixel detector; and measuring the output of the EM detector and the output of the at least one single pixel detector for reconstructing the EM wave spectrum taking into account an intensity distribution of an incident EM wave on the entrance aperture.