Attenuation effects on imaging diagnostics of hollow-cone sprays

Sick, Volker; Stojkovic, Boris Dragomir

doi:10.1364/ao.40.002435

Cited by 50 publications

(34 citation statements)

References 11 publications

(13 reference statements)

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“…A further issue of the LIF/Mie technique is related to the secondary scattering of light scattered from the illuminated droplets by other droplets present along the path to the camera lens [40][41][42][43] which is not negligible and can affect the sizing accuracy.…”

Section: Introductionmentioning

confidence: 99%

Numerical evaluation of droplet sizing based on the ratio of fluorescent and scattered light intensities (LIF/Mie technique)

Charalampous

Hardalupas

2011

Appl. Opt.

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Section: Introductionmentioning

confidence: 99%

Numerical evaluation of droplet sizing based on the ratio of fluorescent and scattered light intensities (LIF/Mie technique)

Charalampous

Hardalupas

2011

Appl. Opt.

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“…Another solution is to experimentally use bidirectional illumination by means of sequential excitations from counter-propagating laser sheets. Such techniques have been applied for both Planar Liquid Laser Induce Fluorescence and planar Mie imaging [13][14][15]. In addition to these corrections, other methods have been tested to account for signal attenuation [10,15].…”

Section: Introductionmentioning

confidence: 99%

Application of structured illumination for multiple scattering suppression in planar laser imaging of dense sprays

Berrocal¹,

Kristensson²,

Richter³

et al. 2008

Opt. Express

156

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“…Approaches for addressing the first effect include bidirectional illumination (Su, Drake et al 1998), measurement of the amount of attenuation of the LIF signals by means of a laser dye cuvette and compensation for the attenuation (Sick and Stojkovic 2001), sequential illumination by opposed laser sheets (Douglas, Verdieck et al 1996).…”

Section: Data Processing Methodologymentioning

confidence: 99%

Planar Droplet Sizing in Dense Sprays

Hardalupas¹

2013

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information , 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY)8 April 2013 (From -To) REPORT TYPE Final Report DATES COVERED PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)Imperial College of Science Technology and Medicine Exhibition Road London, U K SW7 2BT PERFORMING ORGANIZATION REPORT NUMBERN/A SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)EOARD Unit 4515 BOX 14 APO AE 09421 SPONSOR/MONITOR'S ACRONYM(S)AFRL/AFOSR/IOE (EOARD) SPONSOR/MONITOR'S REPORT NUMBER(S) AFRL-AFOSR-UK-TR-2013-001512. DISTRIBUTION/AVAILABILITY STATEMENT Distribution A: Approved for public release; distribution is unlimited. SUPPLEMENTARY NOTES ABSTRACTAn investigation was undertaken to examine the application of a laser beam scanning methodology on the measurement of the time-averaged spray spatial structure. This approach can directly reduce secondary light scattering effects from the spray droplets and can take into account probe laser beam and scattered light intensity attenuation in order to reduce associated uncertainties on the spray characteristics. Evaluation of two approaches was performed, where one considered scanning the probe laser beam across the spray and the other considered traversing the spray while the probing beam and the imaging optics were fixed. It is determined that for the purposes of evaluating the methodology for correcting quantitative measurement errors due to attenuation, the second approach is more appropriate. This is because scanning the beam would require constant refocusing of the imaging system to the probed region. Another issue is the changing imaging resolution as the distance between the probe laser beam and the imaging optics is constantly changing. By traversing the spray across the probe beam, both of the aforementioned effects are eliminated and the signal correction methodology can be applied directly. The scattered light intensity correction methodology was successfully applied to a flat spray with measurements close to the nozzle and beam probing along the long dimension of the spray, so that attenuation effects are more profound. It is determined that attenuation of the laser beam along the spray can be as high as 20% and attenuation of the measured int...

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Attenuation effects on imaging diagnostics of hollow-cone sprays

Cited by 50 publications

References 11 publications

Numerical evaluation of droplet sizing based on the ratio of fluorescent and scattered light intensities (LIF/Mie technique)

Numerical evaluation of droplet sizing based on the ratio of fluorescent and scattered light intensities (LIF/Mie technique)

Application of structured illumination for multiple scattering suppression in planar laser imaging of dense sprays

Planar Droplet Sizing in Dense Sprays

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