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Title: Single-fiber multi-color pyrometry

Abstract

This invention is a fiber-based multi-color pyrometry set-up for real-time non-contact temperature and emissivity measurement. The system includes a single optical fiber to collect radiation emitted by a target, a reflective rotating chopper to split the collected radiation into two or more paths while modulating the radiation for lock-in amplification (i.e., phase-sensitive detection), at least two detectors possibly of different spectral bandwidths with or without filters to limit the wavelength regions detected and optics to direct and focus the radiation onto the sensitive areas of the detectors. A computer algorithm is used to calculate the true temperature and emissivity of a target based on blackbody calibrations. The system components are enclosed in a light-tight housing, with provision for the fiber to extend outside to collect the radiation. Radiation emitted by the target is transmitted through the fiber to the reflective chopper, which either allows the radiation to pass straight through or reflects the radiation into one or more separate paths. Each path includes a detector with or without filters and corresponding optics to direct and focus the radiation onto the active area of the detector. The signals are recovered using lock-in amplification. Calibration formulas for the signals obtained using amore » blackbody of known temperature are used to compute the true temperature and emissivity of the target. The temperature range of the pyrometer system is determined by the spectral characteristics of the optical components.« less

Inventors:
 [1]
  1. Berkeley, CA
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
872804
Patent Number(s):
US 6012840
Assignee:
Regents of University of California (Oakland, CA)
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
single-fiber; multi-color; pyrometry; fiber-based; set-up; real-time; non-contact; temperature; emissivity; measurement; single; optical; fiber; collect; radiation; emitted; target; reflective; rotating; chopper; split; collected; paths; modulating; lock-in; amplification; phase-sensitive; detection; detectors; possibly; spectral; bandwidths; filters; limit; wavelength; regions; detected; optics; direct; focus; sensitive; computer; algorithm; calculate; true; based; blackbody; calibrations; components; enclosed; light-tight; housing; provision; extend; outside; transmitted; allows; pass; straight; reflects; separate; path; detector; corresponding; active; signals; recovered; calibration; formulas; obtained; compute; range; pyrometer; determined; characteristics; phase-sensitive detection; wavelength region; sensitive detection; optical components; temperature range; optical fiber; radiation emitted; single optical; computer algorithm; spectral characteristics; multi-color pyrometry; spectral characteristic; non-contact temperature; collect radiation; optical component; spectral bandwidth; single optic; /374/

Citation Formats

Small, IV, Ward, and Celliers, Peter. Single-fiber multi-color pyrometry. United States: N. p., 2000. Web.
Small, IV, Ward, & Celliers, Peter. Single-fiber multi-color pyrometry. United States.
Small, IV, Ward, and Celliers, Peter. 2000. "Single-fiber multi-color pyrometry". United States. https://www.osti.gov/servlets/purl/872804.
@article{osti_872804,
title = {Single-fiber multi-color pyrometry},
author = {Small, IV, Ward and Celliers, Peter},
abstractNote = {This invention is a fiber-based multi-color pyrometry set-up for real-time non-contact temperature and emissivity measurement. The system includes a single optical fiber to collect radiation emitted by a target, a reflective rotating chopper to split the collected radiation into two or more paths while modulating the radiation for lock-in amplification (i.e., phase-sensitive detection), at least two detectors possibly of different spectral bandwidths with or without filters to limit the wavelength regions detected and optics to direct and focus the radiation onto the sensitive areas of the detectors. A computer algorithm is used to calculate the true temperature and emissivity of a target based on blackbody calibrations. The system components are enclosed in a light-tight housing, with provision for the fiber to extend outside to collect the radiation. Radiation emitted by the target is transmitted through the fiber to the reflective chopper, which either allows the radiation to pass straight through or reflects the radiation into one or more separate paths. Each path includes a detector with or without filters and corresponding optics to direct and focus the radiation onto the active area of the detector. The signals are recovered using lock-in amplification. Calibration formulas for the signals obtained using a blackbody of known temperature are used to compute the true temperature and emissivity of the target. The temperature range of the pyrometer system is determined by the spectral characteristics of the optical components.},
doi = {},
url = {https://www.osti.gov/biblio/872804}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {1}
}

Works referenced in this record:

Temperature measurements utilizing two-bandpass fiber optic radiometry
journal, February 1995


Dual-wavelength fiber optic temperature sensor
conference, March 1994


Two-Color Imaging Radiometry For Pyrotechnic Diagnostics
conference, May 1987


Two-color ratio pyrometer with optical fiber for over-heating gas
conference, March 1994


Radiation Ratio Thermometry
book, December 1988


Laser tissue welding mediated with a protein solder
conference, May 1996


Two‐bandpass fiber‐optic radiometry for monitoring the temperature of photoresist during dry processing
journal, April 1996


A two‐color spatial‐scanning pyrometer for the determination of temperature profiles in combustion synthesis reactions
journal, October 1995