Fabry-Perot Spectrometer Simultaneous Multi-Band Detection
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Solution Overview
Problem
Conventional imaging spectrometers are slow in measurement due to their scanning nature, which limits the amount of information obtained from a single momentary measurement, as they typically measure either a single line or a single wavelength band at a time.
Innovation Solution
The use of a spectrometer that employs a Fabry-Perot-type interference element with adjustable mirror gaps to select desired wavelength bands, combined with a detector capable of distinguishing different wavelengths, allowing for simultaneous detection of multiple orders of interference, thereby increasing the amount of information obtained from a single measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional imaging spectrometers use scanning methods to measure wavelength ranges, then measurement precision is improved, but measurement speed deteriorates
Solution Approach 1:
The spectrum is segmented into multiple wavelength bands, with each band detected by a dedicated detector element. This allows simultaneous measurement of multiple spectral regions rather than sequential scanning, resolving the contradiction between measurement precision and speed by dividing the spectral range into parallel detection channels.
Solution Approach 2:
The patent transitions from one-dimensional spectral scanning to two-dimensional simultaneous detection by spatially separating different wavelength bands and directing them to different detector elements. This dimensional change enables parallel acquisition of multiple spectral bands, achieving both high precision and fast measurement.
2Device complexity
If conventional spectrometers measure a single wavelength band at a time, then device complexity is reduced, but information quantity deteriorates
Solution Approach 1:
The spectrometer is designed with multi-functionality to simultaneously measure multiple wavelength bands across different spectral regions (visible, NIR, SWIR). By equipping the system with detectors sensitive to multiple bands and using optical elements that can handle broad spectral ranges, the device achieves comprehensive spectral coverage without proportionally increasing complexity.
Solution Approach 2:
Multiple detection functions are merged into a single detector array, where different detector elements simultaneously capture different wavelength bands. This consolidation allows the system to obtain comprehensive spectral information in one measurement, avoiding the need for multiple separate measurement systems.
3Device complexity
If sequential scanning is used to cover the entire wavelength range, then detector complexity is reduced, but measurement time increases
Solution Approach 1:
The measurement process achieves continuity by simultaneously detecting multiple wavelength bands rather than sequentially scanning through them. All detector elements operate concurrently to capture spectral information across the entire wavelength range, eliminating idle time between measurements and achieving continuous spectral acquisition.
Solution Approach 2:
The system employs tunable optical elements that can dynamically adjust the spectral bands directed to different detector elements. This dynamic capability allows the spectrometer to adaptively optimize the measurement configuration for different applications while maintaining simultaneous multi-band detection, reducing measurement time without requiring overly complex fixed detector arrays.
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 enables faster spectroscopic imaging and acquisition of more information by allowing multiple wavelength bands to be measured simultaneously, reducing the need for sequential scanning and improving measurement speed and reliability.
Implementation Method 1
light is directed from an object to be investigated to an interference element, in this case a Fabry-Perot-type interferometer, in order to produce an interference pattern
Implementation Method 2
the interference pattern produced is directed to a detector, at which the interference pattern can be distinguished into at least two separate wavelength bands
Data Source
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AI summary
The invention relates to a spectrometer, a spectrometric method and detector, and a new use of an interferometer. The spectrometer comprises a Fabry-Perot interferometer (120), to which light can be guided from the object (100) being investigated, in order to produce an interference image, and a detector (130) at which the interference image is aimed. The transmittance of the interferometer (120) is spectrally sliced to at least two separate wavelength bands. For its parts, the detector (130) is arranged to detect the interference image from at least two separate wavelength bands spatially. The detector is arranged to detect the said wavelength bands simultaneously, by exploiting the response of the image elements of the detector, calibrated as a function of the mirror gap of the interferometer, in order to detect simultaneously at least two different orders of the interference. With the aid of the invention, it is possible to implement spectrometric measurements more quickly, or to obtain more information on the object at one time.