Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 47, Issue 47, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/47/47/475501
Keywords
spatial light modulator; computer generated holograms; multi-point laser-induced spark; laser ignition
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Funding
- UK's Engineering & Physical Sciences Research Council (EPSRC)
- Ford Motor Company at the University of Liverpool (EPSRC) [EP/J003573/1]
- Cambustion Ltd at the University of Liverpool (EPSRC) [EP/J003573/1]
- Engineering and Physical Sciences Research Council [EP/J003573/1] Funding Source: researchfish
- EPSRC [EP/J003573/1] Funding Source: UKRI
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This paper reports on a technique demonstrating for the first time successful multi-point laser-induced spark generation, which is variable in three dimensions and derived from a single laser beam. Previous work on laser ignition of internal combustion engines found that simultaneously igniting in more than one location resulted in more stable and faster combustion - a key potential advantage over conventional spark ignition. However, previous approaches could only generate secondary foci at fixed locations. The work reported here is an experimental technique for multi-point laser ignition, in which several sparks with arbitrary spatial location in three dimensions are created by variable diffraction of a pulsed single laser beam source and transmission through an optical plug. The diffractive multi-beam arrays and patterns are generated using a spatial light modulator on which computer generated holograms are displayed. A gratings and lenses algorithm is used to accurately modulate the phase of the input laser beam and create multi-beam output. The underpinning theory, experimental arrangement and results obtained are presented and discussed.
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