Multiplex tunable filter spectrometer
First Claim
1. A spectroscopic method for detecting and/or quantifying one or more species in a sample, the method comprising the steps of:
- directing electromagnetic radiation from an electromagnetic radiation source into an optical filter module comprising one or more optical interference filters, the one or more optical filters comprising a plurality of multiplexed bandpass regions configured to transmit multiple wavelength bands of electromagnetic radiation through the filter module simultaneously;
directing the simultaneously transmitted multiple wavelength bands of electromagnetic radiation through a sample comprising one or more species;
directing the simultaneously transmitted multiple wavelength bands of electromagnetic radiation from the sample into an optical detector;
generating, by the optical detector, one or more electrical signals indicative of electromagnetic radiation intensity over a sweep of wavelengths within each of the multiple wavelength bands;
continuously sweeping the plurality of multiplexed bandpass regions to produce data corresponding to the one or more electrical signals; and
processing the data corresponding to the one or more electrical signals to identify and/or quantify one or more species present in the sample.
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Abstract
The invention provides spectroscopic systems and spectrometers employing an optical interference filter module having a plurality of bandpass regions. In certain embodiments, the systems include a mechanism for wavelength tuning/scanning and wavelength band decoding based on an angular motion of one or more filters. A spectral processing algorithm separates the multiplexed wavelength-scanned bandpass regions and quantifies the concentrations of the analyzed chemical and/or biological species. The spectroscopic system allows for compact, multi-compound analysis, employing a single-element detector for maximum performance-to-cost ratio. The spectroscopic system also allows for high-sensitivity measurement and robust interference compensation.
28 Citations
17 Claims
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1. A spectroscopic method for detecting and/or quantifying one or more species in a sample, the method comprising the steps of:
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directing electromagnetic radiation from an electromagnetic radiation source into an optical filter module comprising one or more optical interference filters, the one or more optical filters comprising a plurality of multiplexed bandpass regions configured to transmit multiple wavelength bands of electromagnetic radiation through the filter module simultaneously; directing the simultaneously transmitted multiple wavelength bands of electromagnetic radiation through a sample comprising one or more species; directing the simultaneously transmitted multiple wavelength bands of electromagnetic radiation from the sample into an optical detector; generating, by the optical detector, one or more electrical signals indicative of electromagnetic radiation intensity over a sweep of wavelengths within each of the multiple wavelength bands; continuously sweeping the plurality of multiplexed bandpass regions to produce data corresponding to the one or more electrical signals; and processing the data corresponding to the one or more electrical signals to identify and/or quantify one or more species present in the sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification