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Title: Fiber coupled optical spark delivery system

Abstract

A spark delivery system for generating a spark using a laser beam is provided, the spark delivery system including a laser light source and a laser delivery assembly. The laser delivery assembly includes a hollow fiber and a launch assembly comprising launch focusing optics to input the laser beam in the hollow fiber. In addition, the laser delivery assembly includes exit focusing optics that demagnify an exit beam of laser light from the hollow fiber, thereby increasing the intensity of the laser beam and creating a spark. In accordance with embodiments of the present invention, the assembly may be used to create a spark in a combustion engine. In accordance with other embodiments of the present invention, a method of using the spark delivery system is provided. In addition, a method of choosing an appropriate fiber for creating a spark using a laser beam is also presented.

Inventors:
 [1];  [1];  [1]
  1. (Fort Collins, CO)
Publication Date:
Research Org.:
NETL (National Energy Technology Laboratory, Pittsburgh, PA, and Morgantown, WV (United States))
Sponsoring Org.:
USDOE
OSTI Identifier:
985507
Patent Number(s):
7,412,129
Application Number:
11/126,908; TRN: US201016%%1985
Assignee:
Colorado State University Research Foundation (Ft. Collins, CO) NETL
DOE Contract Number:
FC26-02NT41335
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; OPTICAL FIBERS; FOCUSING; LASERS; DESIGN; SPARK IGNITION ENGINES; IGNITION SYSTEMS

Citation Formats

Yalin, Azer, Willson, Bryan, and Defoort, Morgan. Fiber coupled optical spark delivery system. United States: N. p., 2008. Web.
Yalin, Azer, Willson, Bryan, & Defoort, Morgan. Fiber coupled optical spark delivery system. United States.
Yalin, Azer, Willson, Bryan, and Defoort, Morgan. Tue . "Fiber coupled optical spark delivery system". United States. doi:. https://www.osti.gov/servlets/purl/985507.
@article{osti_985507,
title = {Fiber coupled optical spark delivery system},
author = {Yalin, Azer and Willson, Bryan and Defoort, Morgan},
abstractNote = {A spark delivery system for generating a spark using a laser beam is provided, the spark delivery system including a laser light source and a laser delivery assembly. The laser delivery assembly includes a hollow fiber and a launch assembly comprising launch focusing optics to input the laser beam in the hollow fiber. In addition, the laser delivery assembly includes exit focusing optics that demagnify an exit beam of laser light from the hollow fiber, thereby increasing the intensity of the laser beam and creating a spark. In accordance with embodiments of the present invention, the assembly may be used to create a spark in a combustion engine. In accordance with other embodiments of the present invention, a method of using the spark delivery system is provided. In addition, a method of choosing an appropriate fiber for creating a spark using a laser beam is also presented.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Aug 12 00:00:00 EDT 2008},
month = {Tue Aug 12 00:00:00 EDT 2008}
}

Patent:

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  • A spark delivery system for generating a spark using a laser beam is provided, and includes a laser light source and a laser delivery assembly. The laser delivery assembly includes a hollow fiber and a launch assembly comprising launch focusing optics to input the laser beam in the hollow fiber. The laser delivery assembly further includes exit focusing optics that demagnify an exit beam of laser light from the hollow fiber, thereby increasing the intensity of the laser beam and creating a spark. Other embodiments use a fiber laser to generate a spark. Embodiments of the present invention may bemore » used to create a spark in an engine. Yet other embodiments include collecting light from the spark or a flame resulting from the spark and conveying the light for diagnostics. Methods of using the spark delivery systems and diagnostic systems are provided.« less
  • A spark delivery system for generating a spark using a laser beam is provided, and includes a laser light source and a laser delivery assembly. The laser delivery assembly includes a hollow fiber and a launch assembly comprising launch focusing optics to input the laser beam in the hollow fiber. The laser delivery assembly further includes exit focusing optics that demagnify an exit beam of laser light from the hollow fiber, thereby increasing the intensity of the laser beam and creating a spark. Other embodiments use a fiber laser to generate a spark. Embodiments of the present invention may bemore » used to create a spark in an engine. Yet other embodiments include collecting light from the spark or a flame resulting from the spark and conveying the light for diagnostics. Methods of using the spark delivery systems and diagnostic systems are provided.« less
  • In combination, this patent describes means for generating a laser beam; means for focusing the laser beam onto a first end of a fiber optic cable, wherein the fiber optic cable includes means for transmitting the cooling agent coaxially with the fiber optic cable along the length of the fiber optic cable; and means, disposed at a second end of the fiber optic cable, for receiving the laser beam emergent from the second end of the fiber optic cable and for focusing the emergent laser beam onto a workpiece. The receiving and focusing means includes means for applying the transmittedmore » cooling agent to the second end of the fiber optic cable and to the workpiece coaxially with the laser beam.« less
  • A displacement sensor includes a first optical fiber for radiating light to a target, and a second optical fiber for receiving light from the target. The end of the first fiber is adjacent and not axially aligned with the second fiber end. A lens focuses light from the first fiber onto the target and light from the target onto the second fiber.
  • An optical fiducial timing system is provided for use with interdependent groups of X-ray streak cameras (18). The aluminum coated (80) ends of optical fibers (78) are positioned with the photocathodes (20, 60, 70) of the X-ray streak cameras (18). The other ends of the optical fibers (78) are placed together in a bundled array (90). A fiducial optical signal (96), that is comprised of 2.omega. or 1.omega. laser light, after introduction to the bundled array (90), travels to the aluminum coated (82) optical fiber ends and ejects quantities of electrons (84) that are recorded on the data recording mediamore » (52) of the X-ray streak cameras (18). Since both 2.omega. and 1.omega. laser light can travel long distances in optical fiber with only a slight attenuation, the initial arial power density of the fiducial optical signal (96) is well below the damage threshold of the fused silica or other material that comprises the optical fibers (78, 90). Thus the fiducial timing system can be repeatably used over long durations of time.« less