Open AccessArchimedean spiral push-broom differential thermal imaging for gas leakage detection
Author(s) -
Luo Xiuli,
Junhui Ma,
Dongqi Chen,
Lingxue Wang,
Yi Cai,
Heng Pan,
Caiping Wang,
Hong Luo,
Wei Xue
Publication year - 2019
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.009099
Subject(s) - optics , frame rate , spiral (railway) , cardinal point , leakage (economics) , sensitivity (control systems) , infrared , materials science , physics , thermal , mathematics , electronic engineering , engineering , mathematical analysis , meteorology , economics , macroeconomics
An uncooled infrared focal plane array (FPA) for a multiband optical imaging system monitoring small gas leakages is low in cost but limited by its frame rate and sensitivity. We propose the concept of Archimedean spiral push-broom filtering (ASPBF), where the trajectory of an Archimedean spiral over the FPA is approximated as a straight line. The ASPBF precisely matches the electronic pulse scanning of the uncooled infrared FPA row by row to improve the frame rate. We applied differential imaging to promote gas detection sensitivity. Prototype can detect 11 ml/min of ethylene gas at ΔT = 3 °C with frame rate of 8 fps.