System for sample detection with compensation for difference in sensitivity to detection of components moving at different velocities
First Claim
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1. A method for separation and detection of components of a sample, said method comprising the steps of:
- causing components of the sample to migrate at different velocities and separate in a separation path;
supplying radiation to the components to cause the components to exhibit a detectable response, wherein fractions of said components are altered by the radiation so as to become undetectable;
detecting the response of the components when they are migrating at different velocities at a data rate;
wherein the intensity of the radiation supplied in the supplying step or the data rate of the detecting step is altered as a function of different lengths of migration time of the components to reduce differences in signal-to-noise ratio of components migrating at different velocities.
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Abstract
In many separation techniques, such as field flow fractionation, liquid chromatography and electro-phoresis, chemical species form bands that migrate at different velocities. If the data-digitization rate and excitation intensity are both set to be optimal for the fastest migrating band, to compensate for different band velocities, both the data-digitization rate and the excitation intensity are decreased as a function of time by a factor equal to the migration time of the fastest migrating band to the separation time.
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Citations
31 Claims
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1. A method for separation and detection of components of a sample, said method comprising the steps of:
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causing components of the sample to migrate at different velocities and separate in a separation path; supplying radiation to the components to cause the components to exhibit a detectable response, wherein fractions of said components are altered by the radiation so as to become undetectable; detecting the response of the components when they are migrating at different velocities at a data rate; wherein the intensity of the radiation supplied in the supplying step or the data rate of the detecting step is altered as a function of different lengths of migration time of the components to reduce differences in signal-to-noise ratio of components migrating at different velocities. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for detection of components of a sample migrating at different velocities along a path, said method comprising the steps of:
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supplying radiation to the components to cause the components to exhibit a detectable response, wherein fractions of said components are altered by the radiation so as to become undetectable; detecting the response of the components when they are migrating at different velocities at a data rate; wherein the intensity of the radiation supplied in the supplying step or the data rate of the detecting step is altered as a function of different lengths of migration time of the components to reduce differences in signal-to-noise ratio of components migrating at different velocities. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method for detection of components of a sample migrating at different velocities along a path, said method comprising the steps of:
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supplying radiation to the components in a detection zone of the path to cause the components to exhibit a detectable response, wherein fractions of said components are altered by the radiation so as to become undetectable; detecting the response of the components when they are migrating in the zone at different velocities at a data rate; wherein the intensity of the radiation supplied in the supplying step or the data rate of the detecting step is altered as a function of different lengths of migration time of the components in the zone to reduce differences in signal-to-noise ratio of components migrating at different velocities.
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Specification