CALIBRATION SCHEME FOR GAS ABSORPTION SPECTRA DETECTION
First Claim
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1. A method for removing the background from a transmission spectrum, comprising:
- determining performance characteristics of a detector;
measuring a transmission spectrum that includes an absorption line;
determining performance characteristics of a gas cell; and
removing a background spectrum from the transmission spectrum by combining the transmission spectrum with the performance characteristics of the detector and the performance characteristics of the gas cell.
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Abstract
A technique for removing the background from a transmission spectrum including determining performance characteristics of a detector, measuring a transmission spectrum that includes an absorption line, determining performance characteristics of a gas cell, and removing a background spectrum from the transmission spectrum by combining the transmission spectrum with the performance characteristics of the detector and the performance characteristics of the gas cell.
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Citations
23 Claims
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1. A method for removing the background from a transmission spectrum, comprising:
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determining performance characteristics of a detector; measuring a transmission spectrum that includes an absorption line; determining performance characteristics of a gas cell; and removing a background spectrum from the transmission spectrum by combining the transmission spectrum with the performance characteristics of the detector and the performance characteristics of the gas cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for removing a background spectrum from a measured spectrum, comprising:
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an absorption cell containing a gas; a radio frequency (RF) transmitter to transmit a RF signal through the absorption cell; a detector to receive the RF signal; and a control module coupled to the transmitter and the detector to; estimate performance characteristics of the detector and performance characteristics of the gas cell; measure a transmission spectrum of the gas in the absorption cell; and combine the transmission spectrum with the performance characteristics of the gas cell and the detector to remove a background spectrum from the transmission spectrum. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A spectrometer, comprising:
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an absorption cell containing a gas; a radio frequency (RF) transmitter to transmit RF signals into the absorption cell; a RF receiver to receive the RF signals; and a RF signal generation and detection module coupled to the transmitter and the receiver to; generate the RF signals; detect the RF signals received by the receiver; measure a transmission spectrum based on the received RF signals, wherein the measured transmission spectrum includes an absorption line of the gas and a background spectrum; remove the background spectrum from the transmission spectrum leaving an absorption line spectrum, wherein the removal of the background spectrum calibrates the spectrometer; generate an error signal based on the absorption line spectrum; and adjust the transmitted RF signals to lock-in on the absorption line spectrum. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification