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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 3 — Jan. 20, 2014
  • pp: 316–326

High-repetition-rate three-dimensional OH imaging using scanned planar laser-induced fluorescence system for multiphase combustion

Kevin Y. Cho, Aman Satija, Timothée L. Pourpoint, Steven F. Son, and Robert P. Lucht  »View Author Affiliations


Applied Optics, Vol. 53, Issue 3, pp. 316-326 (2014)
http://dx.doi.org/10.1364/AO.53.000316


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Abstract

Imaging dynamic multiphase combusting events is challenging. Conventional techniques can image only a single plane of an event, capturing limited details. Here, we report on a three-dimensional, time-resolved, OH planar laser-induced fluorescence (3D OH PLIF) technique that was developed to measure the relative OH concentration in multiphase combustion flow fields. To the best of our knowledge, this is the first time a 3D OH PLIF technique has been reported in the open literature. The technique involves rapidly scanning a laser sheet across a flow field of interest. The overall experimental system consists of a 5 kHz OH PLIF system, a high-speed detection system (image intensifier and CMOS camera), and a galvanometric scanning mirror. The scanning mirror was synchronized with a 500 Hz triangular sweep pattern generated using Labview. Images were acquired at 5 kHz corresponding to six images per mirror scan, and 1000 scans per second. The six images obtained in a scan were reconstructed into a volumetric representation. The resulting spatial resolution was 500×500×6 voxels mapped to a field of interest covering 30mm×30mm×8mm. The novel 3D OH PLIF system was applied toward imaging droplet combustion of methanol gelled with hydroxypropyl cellulose (HPC) (3 wt. %, 6 wt. %), as well as solid propellant combustion, and impinging jet spray combustion. The resulting 3D dataset shows a comprehensive view of jetting events in gelled droplet combustion that was not observed with high-speed imaging or 2D OH PLIF. Although the scan is noninstantaneous, the temporal and spatial resolution was sufficient to view the dynamic events in the multiphase combustion flow fields of interest. The system is limited by the repetition rate of the pulsed laser and the step response time of the galvanometric mirror; however, the repetition rates are sufficient to resolve events in the order of 100 Hz. Future upgrade includes 40 kHz pulsed UV laser system, which can reduce the scan time to 125 μs, while keeping the high repetition rate of 1000 Hz.

© 2014 Optical Society of America

OCIS Codes
(170.0110) Medical optics and biotechnology : Imaging systems
(170.3010) Medical optics and biotechnology : Image reconstruction techniques

ToC Category:
Image Processing

History
Original Manuscript: August 30, 2013
Revised Manuscript: November 16, 2013
Manuscript Accepted: November 18, 2013
Published: January 14, 2014

Citation
Kevin Y. Cho, Aman Satija, Timothée L. Pourpoint, Steven F. Son, and Robert P. Lucht, "High-repetition-rate three-dimensional OH imaging using scanned planar laser-induced fluorescence system for multiphase combustion," Appl. Opt. 53, 316-326 (2014)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-53-3-316

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Supplementary Material


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» Media 2: MOV (10828 KB)     

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