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dc.contributor.advisorKarunasiri, Gamani
dc.contributor.authorBehnken, Barry N.
dc.dateJune 2008
dc.date.accessioned2012-08-22T15:31:58Z
dc.date.available2012-08-22T15:31:58Z
dc.date.issued2008-06
dc.identifier.urihttp://hdl.handle.net/10945/10329
dc.description.abstractReal-time imaging in the terahertz (THz) spectral range was achieved using an uncooled, 160x120 pixel infrared microbolometer camera and a milliwatt-scale quantum cascade laser (QCL). By replacing the camera's original focusing optics with a Tsurupica-based lens and minimizing diffraction effects incurred by the QCL output beam, an imaging scheme was developed in which the camera's focal plane array successfully detected wavelengths that are more than an order of magnitude longer than those for which the system is designed. Moreover, the incorporation of parabolic reflecting optics yielded a capability to produce high-resolution images of objects placed within the beam path. Despite the low laser powers employed, this scheme allows high-contrast imaging of various objects concealed by a wide range of nonmetallic materials-confirming the suitability of this technology for homeland security screening applications. Furthermore, the identification of relatively obscure security features in British currency notes suggests that Terahertz imaging could serve a future role as a detection mechanism against assorted counterfeiting practices. An extensive comparative analysis of experimental data produced using two QCLs (resonating at 2.8 and 3.6 THz) provides additional insight into the physics underlying these results, and suggests methods by which this imaging technology could be further improved.en_US
dc.description.urihttp://archive.org/details/realtimeterahert1094510329
dc.format.extentxviii, 81 p. : ill. (chiefly col.) ; 28 cm.en_US
dc.publisherMonterey, California: Naval Postgraduate School, 2008.en_US
dc.subject.lcshSilicon nitride.en_US
dc.titleReal-time terahertz imaging using a quantum cascade laser and uncooled microbolometer focal plane arrayen_US
dc.contributor.departmentNaval Postgraduate School (U.S.)
dc.subject.authorTHzen_US
dc.subject.authorterahertzen_US
dc.subject.authorreal-timeen_US
dc.subject.authormicrobolometeren_US
dc.subject.authoruncooleden_US
dc.subject.authorQCLen_US
dc.subject.authorquantum cascade laseren_US
dc.subject.authorimagingen_US
dc.subject.authordetectionen_US
dc.subject.authorcameraen_US
dc.subject.authorfocal plane arrayen_US
dc.subject.authorTsurupicaen_US
dc.subject.authorNETDen_US
dc.subject.authorNEPen_US
dc.subject.authorvanadium oxideen_US
dc.subject.authorsilicon nitrideen_US
etd.thesisdegree.namePh.D. in Physicsen_US
etd.thesisdegree.levelDoctoralen_US
etd.thesisdegree.disciplinePhysicsen_US
etd.thesisdegree.grantorNaval Postgraduate School (U.S.)en_US
dc.description.distributionstatementApproved for public release; distribution is unlimited.


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