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Title: Noise suppressing capillary separation system

Abstract

A noise-suppressing capillary separation system for detecting the real-time presence or concentration of an analyte in a sample is provided. The system contains a capillary separation means through which the analyte is moved, a coherent light source that generates a beam which is split into a reference beam and a sample beam that irradiate the capillary, and a detector for detecting the reference beam and the sample beam light that transmits through the capillary. The laser beam is of a wavelength effective to be absorbed by a chromophore in the capillary. The system includes a noise suppressing system to improve performance and accuracy without signal averaging or multiple scans. 13 figs.

Inventors:
;
Publication Date:
Research Org.:
Iowa State University
OSTI Identifier:
264550
Patent Number(s):
US 5,540,825/A/
Application Number:
PAN: 8-406,714
Assignee:
Iowa State Univ. Research Foundation, Inc., Ames, IA (United States) PTO; SCA: 400102; PA: EDB-96:121588; SN: 96001625898
DOE Contract Number:
W-7405-ENG-82
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 30 Jul 1996
Country of Publication:
United States
Language:
English
Subject:
40 CHEMISTRY; LASER SPECTROSCOPY; SIGNAL-TO-NOISE RATIO; OPTIMIZATION; PRISMS; LIGHT TRANSMISSION; CHEMICAL ANALYSIS

Citation Formats

Yeung, E.S., and Xue, Y. Noise suppressing capillary separation system. United States: N. p., 1996. Web.
Yeung, E.S., & Xue, Y. Noise suppressing capillary separation system. United States.
Yeung, E.S., and Xue, Y. 1996. "Noise suppressing capillary separation system". United States. doi:.
@article{osti_264550,
title = {Noise suppressing capillary separation system},
author = {Yeung, E.S. and Xue, Y.},
abstractNote = {A noise-suppressing capillary separation system for detecting the real-time presence or concentration of an analyte in a sample is provided. The system contains a capillary separation means through which the analyte is moved, a coherent light source that generates a beam which is split into a reference beam and a sample beam that irradiate the capillary, and a detector for detecting the reference beam and the sample beam light that transmits through the capillary. The laser beam is of a wavelength effective to be absorbed by a chromophore in the capillary. The system includes a noise suppressing system to improve performance and accuracy without signal averaging or multiple scans. 13 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1996,
month = 7
}
  • A noise-suppressing capillary separation system for detecting the real-time presence or concentration of an analyte in a sample is provided. The system contains a capillary separation means through which the analyte is moved, a coherent light source that generates a beam which is split into a reference beam and a sample beam that irradiate the capillary, and a detector for detecting the reference beam and the sample beam light that transmits through the capillary. The laser beam is of a wavelength effective to be absorbed by a chromophore in the capillary. The system includes a noise suppressing system to improvemore » performance and accuracy without signal averaging or multiple scans.« less
  • A method of suppressing noise trains that develop from harmonics of a vibrator-type sweep signal is claimed. It includes the step of generating a plurality of such sweep signals in series and with the phase of each succeeding sweep signal being shifted relative to the previous one by a predetermined phase angle which is a fraction of 2..pi... The generated signals are separately recorded and transformed by inverse phase shifting before being added or stacked in a conventional manner.
  • A method is described for suppressing asphaltene formation during coal liquefaction utilizing a hydrogenated coal solvent having been hydrogenated to remove at least about 80% of the asphaltenes which yields as the primary product a mixture of liquid and solids, a part of which is suspended in the liquid. The solids are effectively removed with a minimum loss of desired product and suppressed asphaltene formation by means of a light aromatic solvent in combination with a hydrogenated coal oil solvent having been hydrogenated to remove at least about 80% of the asphaltenes.
  • A system for applying accelerating forces to ionized particles of a vapor in a manner to suppress the flow of electron current from the vapor source. The accelerating forces are applied as an electric field in a configuration orthogonal to a magnetic field. The electric field is applied between one or more anodes in the plasma and one or more cathodes operated as electron emitting surfaces. The circuit for applying the electric field floats the cathodes with respect to the vapor source, thereby removing the vapor source from the circuit of electron flow through the plasma and suppressing the flowmore » of electrons from the vapor source. The potential of other conducting structures contacting the plasma is controlled at or permitted to seek a level which further suppresses the flow of electron currents from the vapor source. Reducing the flow of electrons from the vapor source is particularly useful where the vapor is ionized with isotopic selectivity because it avoids superenergization of the vapor by the electron current.« less