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Two-color pyrometry system to eliminate optical errors for spatially resolved measurements in flames

Journal Article · · Applied Optics
DOI:https://doi.org/10.1364/ao.58.008905· OSTI ID:2339646
 [1];  [2];  [2]
  1. University of Alabama, Tuscaloosa, AL (United States); University of Alabama
  2. University of Alabama, Tuscaloosa, AL (United States)

Two color (2C) pyrometry has long been used to measure flame temperature and soot concentration from radiative emission in flames. While 2C pyrometry is not an absolute measurement in non-axisymmetric flames (such as diesel spray combustion) it is a desirable diagnostic for semi-quantitative or qualitative measurements since it requires minimal optical access and can utilize high-speed imaging to attain exceptional temporal and spatial resolution. In this work, an improved optical configuration of 2C pyrometry is presented that 1) eliminates optical errors inherent in other designs, and 2) uses off-the-shelf optics and a single camera . In particular, this work analyzes the impact of parallax and path length differences on the 2C pyrometry measurement and exemplifies how the present design eliminates associated errors by design rather than in post-processing. Finally, the theoretical range of measurements were generated a priori and overlaid with experimental data to illustrate the dynamic range over which 2C pyrometry can determine the soot concentration and temperature in theory and in practice.

Research Organization:
University of Alabama, Tuscaloosa, AL (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
EE0007980
OSTI ID:
2339646
Alternate ID(s):
OSTI ID: 1573517
Journal Information:
Applied Optics, Journal Name: Applied Optics Journal Issue: 32 Vol. 58; ISSN 1559-128X
Publisher:
Optical Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English

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