Open AccessSequential signal detection for high dynamic range time-resolved laser-induced incandescence
Author(s) -
Raphael Mansmann,
Kevin A. Thomson,
Gregory J. Smallwood,
Thomas Dreier,
Christof Schulz
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.002413
Subject(s) - photomultiplier , incandescence , optics , pyrometer , signal (programming language) , dynamic range , high dynamic range , laser , materials science , noise (video) , wide dynamic range , detector , physics , temperature measurement , soot , computer science , chemistry , programming language , organic chemistry , quantum mechanics , artificial intelligence , image (mathematics) , combustion
A new method for collecting time-resolved laser-induced incandescence (TiRe-LII) signals with high dynamic range is presented. Gated photomultiplier tubes (PMT) are used to detect temporal sections of the LII signal. This helps to overcome the limitations of PMTs caused by restricted maximum signal current at the strong initial signal and poor signal-to-noise ratios when the signal intensity approaches the noise level. We present a simple method for increasing the accuracy of two-color pyrometry at later decay times and two advanced strategies for getting high accuracy over the complete temperature trace or even achieve single-shot capability with high dynamic range. Validation measurements in a standardized flame show that the method is sensitive enough to even resolve the local increase in gas temperature as a consequence of heating the soot particles with a laser pulse.