Performance evaluation of an overdriven LED for high-speed schlieren imaging

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dc.contributor.authorWilson, Steven
dc.contributor.authorGustafson, Garrett
dc.contributor.authorLincoln, Daniel
dc.contributor.authorMurari, Kartik
dc.contributor.authorJohansen, Craig
dc.date.accessioned2016-04-01T21:29:25Z
dc.date.available2016-04-01T21:29:25Z
dc.date.issued2015-02
dc.descriptionAuthor Accepted version of article deposited according to Springer Self-Archiving policy http://www.springer.com/gp/open-access/authors-rights/self-archiving-policy/2124 March 11, 2016.en_US
dc.description.abstractA quantitative comparison of an overdriven light-emitting diode (LED) and a high-intensity discharge (HID) lamp as illumination sources for high-speed schlieren imaging is presented. A custom pulser circuit utilizing a new and improved driver circuit was developed to overdrive the LED by a factor of ten while simultaneously reducing pulse widths to sub-microsecond durations. The LED system has been developed as a simple and inexpensive alternative light source to discharge lamps and pulsed laser systems, which are typical for high-speed schlieren imaging. Image quality of a decaying spherical shock wave, produced from the unsteady release of an under-expanded helium jet, is analyzed to assess comparative performance. The effects of framing rate, camera exposure time, and pulse duration on image quality were assessed and compared for the novel LED and an HID. Framing rates of 10,000 and 50,000 fps and exposure times of 1 and 10 µs were tested. Image quality was assessed qualitatively through side-by-side comparisons of fluid dynamic features such as the resolution of shock waves, compression waves, and shear layers. Quantitative analysis was performed through the comparison of the signal-to-noise ratio at the various conditions. LED performance was found to be superior when imaging fast events and inferior when imaging slower events. Results and potential system improvements indicate that the LED system is ideal for low-cost, high-speed flow imaging.en_US
dc.description.refereedYesen_US
dc.identifier.doi10.1007/s12650-014-0220-7
dc.identifier.urihttp://hdl.handle.net/1880/51133
dc.identifier.urihttps://doi.org/10.11575/PRISM/46024
dc.language.isoenen_US
dc.publisherJournal of Visualizationen_US
dc.publisher.departmentMechanical and Manufacturing Engineeringen_US
dc.publisher.facultySchulich School of Engineeringen_US
dc.publisher.institutionUniversity of Calgaryen_US
dc.publisher.urlThe final publication is available at Springer via http://dx.doi.org/10.1007/s12650-014-0220-7en_US
dc.rightsAn error occurred on the license name.*
dc.rights.uriAn error occurred getting the license - uri.*
dc.subjectSchlieren imagingen_US
dc.subjectLight-emitting diode (LED)en_US
dc.subjectHigh-intensity discharge (HID) lampen_US
dc.subjectShock propagationen_US
dc.titlePerformance evaluation of an overdriven LED for high-speed schlieren imagingen_US
dc.typejournal article
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