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Title: Optical analyzer

Abstract

An optical analyzer wherein a sample of particulate matter, and particularly of organic matter, which has been collected on a quartz fiber filter is placed in a combustion tube, and light from a light source is passed through the sample. The temperature of the sample is raised at a controlled rate and in a controlled atmosphere. The magnitude of the transmission of light through the sample is detected as the temperature is raised. A data processor, differentiator and a two pen recorder provide a chart of the optical transmission versus temperature and the rate of change of optical transmission versus temperature signatures (T and D) of the sample. These signatures provide information as to physical and chemical processes and a variety of quantitative and qualitative information about the sample. Additional information is obtained by repeating the run in different atmospheres and/or different rates or heating with other samples of the same particulate material collected on other filters. 7 figs.

Inventors:
Publication Date:
Research Org.:
Lawrence Berkeley Lab., CA (USA)
OSTI Identifier:
7061089
Patent Number(s):
PATENTS-US-A6101534
Application Number:
ON: DE89000199
Assignee:
Dept. of Energy LBNL; EDB-88-193024
DOE Contract Number:
AC03-76SF00098
Resource Type:
Patent
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 47 OTHER INSTRUMENTATION; LIGHT TRANSMISSION; CORRELATIONS; ORGANIC MATTER; CHEMICAL ANALYSIS; COMBUSTION; DATA PROCESSING; FILTERS; HEATING RATE; INVENTIONS; OPTICAL EQUIPMENT; PYROLYSIS; QUARTZ; TEMPERATURE EFFECTS; CHALCOGENIDES; CHEMICAL REACTIONS; DECOMPOSITION; EQUIPMENT; MINERALS; OXIDATION; OXIDE MINERALS; OXIDES; OXYGEN COMPOUNDS; PROCESSING; SILICON COMPOUNDS; SILICON OXIDES; THERMOCHEMICAL PROCESSES; 400102* - Chemical & Spectral Procedures; 440300 - Miscellaneous Instruments- (-1989)

Citation Formats

Hansen, A.D.. Optical analyzer. United States: N. p., 1987. Web.
Hansen, A.D.. Optical analyzer. United States.
Hansen, A.D.. Mon . "Optical analyzer". United States. doi:.
@article{osti_7061089,
title = {Optical analyzer},
author = {Hansen, A.D.},
abstractNote = {An optical analyzer wherein a sample of particulate matter, and particularly of organic matter, which has been collected on a quartz fiber filter is placed in a combustion tube, and light from a light source is passed through the sample. The temperature of the sample is raised at a controlled rate and in a controlled atmosphere. The magnitude of the transmission of light through the sample is detected as the temperature is raised. A data processor, differentiator and a two pen recorder provide a chart of the optical transmission versus temperature and the rate of change of optical transmission versus temperature signatures (T and D) of the sample. These signatures provide information as to physical and chemical processes and a variety of quantitative and qualitative information about the sample. Additional information is obtained by repeating the run in different atmospheres and/or different rates or heating with other samples of the same particulate material collected on other filters. 7 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Sep 28 00:00:00 EDT 1987},
month = {Mon Sep 28 00:00:00 EDT 1987}
}
  • This invention relates to a system for the calibration of an optical particle-size analyzer of the light-intercepting type for spherical particles, wherein a rotary wheel or disc is provided with radially-extending wires of differing diameters, each wire corresponding to a particular equivalent spherical particle diameter. These wires are passed at an appropriate frequency between the light source and the light detector of the analyzer. The reduction of light as received at the detector is a measure of the size of the wire, and the electronic signal may then be adjusted to provide the desired signal for corresponding spherical particles. Thismore » calibrator may be operated at any time without interrupting other processing.« less
  • An optical analyzer (10) wherein a sample (19) of particulate matter, and particularly of organic matter, which has been collected on a quartz fiber filter (20) is placed in a combustion tube (11), and light from a light source (14) is passed through the sample (19). The temperature of the sample (19) is raised at a controlled rate and in a controlled atmosphere. The magnitude of the transmission of light through the sample (19) is detected (18) as the temperature is raised. A data processor (23), differentiator (28) and a two pen recorder (24) provide a chart of the opticalmore » transmission versus temperature and the rate of change of optical transmission versus temperature signatures (T and D) of the sample (19). These signatures provide information as to physical and chemical processes and a variety of quantitative and qualitative information about the sample (19). Additional information is obtained by repeating the run in different atmospheres and/or different rates of heating with other samples of the same particulate material collected on other filters.« less
  • An optical analyzer (10) wherein a sample (19) of particulate matter, and particularly of organic matter, which has been collected on a quartz fiber filter (20) is placed in a combustion tube (11), and light from a light source (14) is passed through the sample (19). The temperature of the sample (19) is raised at a controlled rate and in a controlled atmosphere. The magnitude of the transmission of light through the sample (19) is detected (18) as the temperature is raised. A data processor (23), differentiator (28) and a two pen recorder (24) provide a chart of the opticalmore » transmission versus temperature and the rate of change of optical transmission versus temperature signatures (T and D) of the sample (19). These signatures provide information as to physical and chemical processes and a variety of quantitative and qualitative information about the sample (19). Additional information is obtained by repeating the run in different atmospheres and/or different rates of heating with other samples of the same particulate material collected on other filters.« less
  • This invention related to a system for the calibration of an optical particle-size analyzer of the light-intercepting type for spherical particles, wherein a rotary wheel or disc is provided with radially-extending wires of differing diameters, each wire corresponding to a particular equivalent spherical particle diameter. These wires were passed at an appropriate frequency between the light source and the light detector of the analyzer. The reduction of light as received at the detector is a measure of the size of the wire, and the electronic signal may then be adjusted to provide the desired signal for corresponding spherical particles. Thismore » calibrator may be operated at any time without interrupting other processing.« less
  • A device is described for sealing and isolating analyzer gas sample flow in a system having an aspirator, the aspirator having gas sample inlet means for drawing a sample gas flow therein and supply air inlet means, comprising: plate members joined together into a rigid structure, the plate members having sealing surfaces; seal means for sealingly engaging the sealing surfaces of the plate members together; at least one of the plate members including flow channel means formed in the respective sealing surface for passing fluid flow along the sealing surface; at least one of the plates including a cavity, atmore » least one of the plates including restrictive passage means in fluid communication between the drain passage and cavity sized so as to provide a full drop in supply air pressure to ambient pressure conditions for fluid passing from the drain passage to the cavity; and outlet means for exhausting fluid from the cavity to the atmosphere.« less