Dual beam acousto-optic tunable spectrometer
First Claim
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1. A dual beam acousto-optic tunable spectrometer comprising;
- a radiation source;
a birefringent acousto-optic tunable filter;
means for driving said acousto-optic tunable filter at a desired frequency such that radiation incident upon said filter is tuned to a first and second beam diverging from each other and the radiation outside the tuned bandwidth;
means for collecting said first tuned beam for use in analyzing a sample; and
means for collecting said second beam for use as a reference.
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Abstract
A dual beam acousto-optic tunable spectrometer utilizes an optics system to isolate the two radiation beams tuned by an acousto-optic filter, one of which is used to analyze a sample, the other of which is used as a reference. The tuning of the filter and the analysis of the signals is conducted by a microprocessor, which corrects for the many possible sources of noise. A new fluid sample cell utilizing glass balls to collimate radiation incident on the sample and focus radiation transmitted from the sample, is also disclosed.
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Citations
37 Claims
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1. A dual beam acousto-optic tunable spectrometer comprising;
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a radiation source; a birefringent acousto-optic tunable filter; means for driving said acousto-optic tunable filter at a desired frequency such that radiation incident upon said filter is tuned to a first and second beam diverging from each other and the radiation outside the tuned bandwidth; means for collecting said first tuned beam for use in analyzing a sample; and means for collecting said second beam for use as a reference.
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2. An acousto-optic tunable spectrometer comprising:
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a radiation source; means for collimating radiation from said radiation source; an acousto-optic tunable filter; means for driving said acousto-optic tunable filter at particular frequencies such that desired narrow bandwidths of radiation incident on said acousto-optic tunable filter will be tuned, said tuned bandwidth forming a first and second tuned beam which diverge from each other and the radiation outside said narrow bandwidth; means for conveying said first tuned beam to a sample; first detector means for detecting said first tuned beam after exposure to said sample; second detector means for detecting said second tuned beam for use as a reference; means for conveying said second tuned beam to said second detector; analyzing means; and means for inputing signals from said first and second detecting means to said analyzing means. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. An acousto-optic tunable spectrometer comprising;
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a radiation source; a collimating lens; a first aperture between said radiation source and said collimating lens defining an angular divergence of radiation from said collimating lens; a birefringent acousto-optic tunable filter for tuning a narrow bandwidth of incident radiation into a first and second tuned beam diverging from each other and the non-tuned radiation; a microprocessor for determining a frequency for driving said acousto-optic tunable filter; a second aperture between said acousto-optic tunable filter and said collimating lens, defining the boundary of the radiation incident on said acousto-optic tunable filter; an achromatic lens system for focusing said first and second tuned beams onto a first and second aperture; first and second optical fibers for collecting said tuned beams; means for focusing said first and second beams from said first and second apertures into said first and second optical fibers; a fluid sample cell including an analysis area bounding the sample to be analyzed, said first optical fiber attaching to said sample cell and providing said first tuned beam for analyzing said sample and means for collecting radiation transmitted and scattered by said sample and focusing said sample radiation on a third optical fiber; a first detecting means for detecting said sample signal from said third optical fiber; a second detecting means for detecting said second tuned beam from said second optical fiber; means for conveying detected signals from said first and second detecting means to said microprocessor for analysis.
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37. A method for the spectroscopic analysis of fluid samples comprising;
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emitting infrared radiation; collimating said radiation; exposing said radiation to a birefringent acoustooptical tunable filter; driving said acousto-optic tunable filter at a desired frequency to tune a specific narrow bandwidth of said radiation yielding a first and second diverging tuned beam; isolating said first and second tuned beam from each other and the non-tuned radiation; separately collecting raid first and second tuned beam; applying said first tuned beam to a sample; collecting the radiation transmitted and scattered by said sample; detecting the collected radiation; detecting the second tuned beam; and determining the absorbance of the sample at the wavelength based on the value of the detected collected radiation and the value of the detected second tuned beam.
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Specification