TUNABLE OPTICAL RECEIVER
First Claim
1. A system for determining information on one or more constituents in a medium, the system comprising:
- N light emitters L1 . . . LN, wherein each light emitter Lx is configured to provide an amplitude modulated (AM) light at modulation frequency fx into a flow path of the medium from one side of a containment vessel for the medium, wherein each light emitter Lx uses a different modulation frequency fx, and wherein Nis an integer greater than 1, and x is an integer greater than or equal to 1 and less than or equal to N;
a photodetector, configured to receive the AM light from each light emitter after it passes through the flow path of the medium, and convert the AM light to an electrical signal characterized by a summation of frequency components from each modulation frequency fx; and
one or more measuring circuits, configured to provide information about a concentration of one or more constituents in the medium determined from log ratios of a pair of amplitudes of fy and fz frequency components in the electrical signal, wherein y and z are integers greater than or equal to 1 and less than or equal to N, and y is not equal to z.
1 Assignment
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Accused Products
Abstract
An embodiment of the disclosure provides a system for determining information on one or more constituents in a medium. The system includes N light emitters L1 . . . LN, wherein each light emitter Lr provides an amplitude modulated (AM) light at modulation frequency fr into a flow path of the medium from one side of a containment vessel for the medium. The system further includes a photodetector, for receiving the AM light from each light emitter after it passes through the flow path of the medium, and converting the AM light to an electrical signal characterized by a summation of frequency components from each modulation frequency fr. The system further includes one or more measuring circuits providing information about a concentration of one or more constituents in the medium determined from log ratios of a pair of amplitudes of fy and fz frequency components in the electrical signal.
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Citations
24 Claims
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1. A system for determining information on one or more constituents in a medium, the system comprising:
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N light emitters L1 . . . LN, wherein each light emitter Lx is configured to provide an amplitude modulated (AM) light at modulation frequency fx into a flow path of the medium from one side of a containment vessel for the medium, wherein each light emitter Lx uses a different modulation frequency fx, and wherein Nis an integer greater than 1, and x is an integer greater than or equal to 1 and less than or equal to N; a photodetector, configured to receive the AM light from each light emitter after it passes through the flow path of the medium, and convert the AM light to an electrical signal characterized by a summation of frequency components from each modulation frequency fx; and one or more measuring circuits, configured to provide information about a concentration of one or more constituents in the medium determined from log ratios of a pair of amplitudes of fy and fz frequency components in the electrical signal, wherein y and z are integers greater than or equal to 1 and less than or equal to N, and y is not equal to z. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for determining information on one or more constituents in a medium, the method comprising:
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varying, by a driving circuit, current provided to N light emitters L1 . . . LN in a sinusoidal manner so that each light emitter Lx provides an amplitude modulated (AM) light at modulation frequency fx into a flow path of the medium from one side of a containment vessel for the medium, wherein each light emitter Lx uses a different modulation frequency fx, and wherein N is an integer greater than 1, and x is an integer greater than or equal to 1 and less than or equal to N; receiving, by a photodetector, the AM light from each light emitter after it passes through the flow path of the medium and converting the AM light to an electrical signal characterized by a summation of frequency components from each modulation frequency fx; extracting, by a measuring circuit, log ratios of the amplitudes of fy and fz frequency components in the electrical signal to determine information about a concentration of one or more constituents in the medium, wherein y and z are integers greater than or equal to 1 and less than or equal to N, and y is not equal to z. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24)
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23. A non-transient computer readable medium containing program instructions for determining information on one or more constituents in a medium, such that when the instructions are executed by a processor coupled to N light emitters L1 . . . LN and a photodetector, the processor performs the method of:
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varying driving current provided to the N light emitters in a sinusoidal manner so that each light emitter Lx provides an amplitude modulated (AM) light at modulation frequency fx into a flow path of the medium from one side of a containment vessel for the medium, wherein each light emitter Lx uses a different modulation frequency fx, and wherein N is an integer greater than 1, and x is an integer greater than or equal to 1 and less than or equal to N; extracting log ratios of amplitudes of fy and fz frequency components in an electrical signal to determine information about a concentration of one or more constituents in the medium, wherein y and z are integers greater than or equal to 1 and less than or equal to N, and y is not equal to z; wherein the electrical signal is generated by a photodetector receiving the AM light from each light emitter after it passes through the flow path of the medium and converting the AM light to an electrical signal characterized by a summation of frequency components from each modulation frequency fx.
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Specification