Digital micro-mirror devices in digital optical microscopy
| dc.contributor.author | Adeyemi, Adekunle Adesanya | |
| dc.contributor.supervisor | Darcie, Thomas E. | |
| dc.date.accessioned | 2009-08-19T15:28:56Z | |
| dc.date.available | 2009-08-19T15:28:56Z | |
| dc.date.copyright | 2009 | en |
| dc.date.issued | 2009-08-19T15:28:56Z | |
| dc.degree.department | Department of Electrical and Computer Engineering | |
| dc.degree.level | Doctor of Philosophy Ph.D. | en |
| dc.description.abstract | In this thesis, studies on the applications of digital micro-mirror devices (DMD) to enhancement of digital optical microscope images are presented. This involves adaptation of the fast switching capability and high optical efficiency of DMD to control the spatial illumination of the specimen. The first study focuses on a method of using DMD to enhance the dynamic range of a digital optical microscope. Our adaptive feedback illumination control method generates a high dynamic range image through an algorithm that combines the DMD-to-camera pixel geometrical mapping and a feedback operation. The feedback process automatically generates an illumination pattern in an iterative fashion that spatially modulates the DMD array elements on a pixel-by-pixel level. Via experiment, we demonstrate a transmitted-light microscope system that uses precise DMD control of a DMD-based projector to enhance the dynamic range ideally by a factor of 573. Results are presented showing approximately 5 times the camera dynamic range, enabling visualization over a wide range of specimen characteristics. The second study presents a technique for programming the source of the spherical reference illumination in a digital in-line holographic microscope using DMD. The programmable point source is achieved by individually addressing the elements of a DMD to spatially control the illumination of the object located at some distance from the source of the spherical reference field. Translation of the ON-state DMD mirror element changes the spatial location of the point source and consequently generates a sequence of translated holograms of the object. The experimental results obtained through numerical reconstruction of translated holograms of Latex microspheres shows the possibility of expanding the field of view by about 263% and also extracting depth information between features in an object volume. The common challenges associated with the use of DMD in coherent and broadband illumination control in both studies are discussed. | en |
| dc.identifier.uri | http://hdl.handle.net/1828/1530 | |
| dc.language | English | eng |
| dc.language.iso | en | en |
| dc.rights | Available to the World Wide Web | en |
| dc.subject | digital microscopy | en |
| dc.subject | Digital micromirror device | en |
| dc.subject | Spatial light modulators | en |
| dc.subject | Imaging systems | en |
| dc.subject | optical systems | en |
| dc.subject | digital holography | en |
| dc.subject.lcsh | UVic Subject Index::Sciences and Engineering | en |
| dc.title | Digital micro-mirror devices in digital optical microscopy | en |
| dc.type | Thesis | en |