METHOD AND SYSTEM FOR MEASURING OPTICAL PROPERTIES OF A MEDIUM USING DIGITAL COMMUNICATION PROCESSING TECHNIQUES
First Claim
1. A system for chemical identification of a medium comprising:
- an online laser for generating an online CW carrier,an offline laser for generating an offline CW carrier, the offline CW carrier including a wavelength different from a wavelength of the online CW carrier,a PN encoder for forming a PN encoded word,a PN′
encoder for forming a PN′
encoded word, the PN′
encoded word being orthogonal to the PN encoded word,modulators for, respectively, modulating the online and offline CW carriers with the PN and PN′
encoded words,a medium for propagating the modulated online and offline CW carriers,a receiver configured to detect the propagated, modulated online and offline CW carriers to form a detected signal,a processor configured to correlate the detected signal with the PN and PN′
encoded words, andthe processor configured to measure a property of the medium based on the correlated detected signal with the PN and PN′
encoded words.
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Accused Products
Abstract
A system for measuring properties of a medium includes an electromagnetic generator for forming a CW carrier, a digital encoder for forming a digital message, and a modulator for modulating the CW carrier with the digital message to form a digitally modulated CW carrier. The medium provides a channel for propagating the digitally modulated CW carrier. The system further includes a receiver configured to receive the propagated, digitally modulated CW carrier, and a processor for measuring at least one property of the medium. The medium may be disposed within a gaseous atmosphere, a body of water, or a cell of a laboratory.
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Citations
13 Claims
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1. A system for chemical identification of a medium comprising:
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an online laser for generating an online CW carrier, an offline laser for generating an offline CW carrier, the offline CW carrier including a wavelength different from a wavelength of the online CW carrier, a PN encoder for forming a PN encoded word, a PN′
encoder for forming a PN′
encoded word, the PN′
encoded word being orthogonal to the PN encoded word,modulators for, respectively, modulating the online and offline CW carriers with the PN and PN′
encoded words,a medium for propagating the modulated online and offline CW carriers, a receiver configured to detect the propagated, modulated online and offline CW carriers to form a detected signal, a processor configured to correlate the detected signal with the PN and PN′
encoded words, andthe processor configured to measure a property of the medium based on the correlated detected signal with the PN and PN′
encoded words. - View Dependent Claims (2, 3, 4)
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5. A system for chemical identification of a medium comprising:
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a laser for generating an optical beam, a digital modulator for modulating the optical beam to form a digitally modulated optical carrier, a transmitter for transmitting the digitally modulated optical carrier through the medium, a receiver for detecting the digitally modulated optical carrier from the medium to form a detected signal, and a processor for measuring at least one property of the medium based on the detected signal, wherein the processor includes code generators for forming a first encoded word and a second encoded word, the laser includes an online laser and an offline laser for generating, respectively, an online beam and an offline beam, the digital modulator includes a first modulator for modulating the online beam using the first encoded word, and a second modulator for modulating the offline beam using the second encoded word, a combiner for combining the modulated online and offline beams to form the digitally modulated optical carrier, and the processor including a digital matched filter for correlating the detected signal with the first and second encoded words. - View Dependent Claims (6, 7)
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8. A method for chemically identifying a medium comprising:
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(a) generating an online CW carrier; (b) generating an offline CW carrier, the offline CW carrier including a wavelength different from a wavelength of the online CW carrier; (c) forming a PN encoded word; (d) forming a PN′
encoded word, the PN′
encoded word being orthogonal to the PN encoded word;(e) modulating the online and offline CW carriers with the PN and PN′
encoded words, respectively;(f) propagating the modulated online and offline CW carriers into a medium; (g) receiving the propagated, modulated online and offline CW carriers to form a detected signal; (h) correlating the detected signal with the PN and PN′
encoded words; and(i) measuring a property of the medium, based on the correlated detected signal with the PN and PN′
encoded words. - View Dependent Claims (9, 10)
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11. A method for chemically identifying a medium comprising:
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(a) generating an optical beam; (b) modulating the optical beam to form a digitally modulated optical carrier; (c) transmitting the digitally modulated optical carrier through the medium; (d) receiving the digitally modulated optical carrier from the medium to form a detected signal; and (e) measuring at least one property of the medium based on the detected signal, wherein step (a) includes generating an online beam and an offline beam; step (b) includes forming a first encoded word and a second encoded word, modulating the online beam using the first encoded word, and modulating the offline beam using the second encoded word; and combining the modulated online and offline beams to form the digitally modulated optical carrier; and step (d) includes correlating the detected signal with the first and second encoded words. - View Dependent Claims (12, 13)
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Specification