Tomographic scanning imagers
Metadata
Vis metadataFinnes i følgende samling
- Institutt for geofag [2330]
Sammendrag
The tomographic scanning (TOSCA) family of imagers collects their raw signals from a line-shaped sensitive area scanned across the image plane. An image is then formed by tomographic reconstruction techniques. A TOSCA imager can be implemented by scanning knife edges, thin slots or thin line detectors across the image plane, repeating the scan at regularly distributed angular intervals. This thesis describes the conception, theory and practical realization of the TOSCA imaging technique, originally based on a simple hot spot scanner. The treatment incudes analysis of noise characteristics, sensitivity to alignment errors and errors in the scanning process, such as temporal offset and jitter. Detailed simulations are used as a tool to establish the different mechanisms that can degrade the image and the extent of their effect. Several experimental demonstrators are presented, operating in the visible, short wave infrared and mid wave infrared spectral domains, and also multispectral operation to demonstrate special features of the TOSCA imager system. Experimental noise measurements are shown to be in good agreement with theory. The reconstruction algorithms of these systems have demonstrated ability to handle illumination intensity modulation frequencies higher than the corresponding frame rate. It is demonstrated that a TOSCA imager can be created using simple and low cost components and consumer grade 3D-printers, opening up for the development of low-cost infrared imagers for use in low-cost survey drones, or for educational purposes.Artikkelliste
I. Harald Hovland, (2004), “Tomographic scanning imaging seeker,” SPIE Proceedings Vol. 5430, Acquisition, Tracking and Pointing XVIII, pp. 58- 64, SPIE 2004. Copyright SPIE 2004 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. Author version. The published version is available at: https://doi.org/10.1117/12.541592 |
II. Harald Hovland, (2007), “Optimisation of the tomographic scanning (TOSCA) imager,” SPIE Proceedings Vol. 6569, Acquisition, Tracking, Pointing, and Laser Systems Technologies XXI, paper 65690I, SPIE 2007. Copyright SPIE 2007 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. Author version. The published version is available at: https://doi.org/10.1117/12.719501 |
III. Harald Hovland, (2008), “Tomographic scanning imager”, Optics Express, Volume 17, Number 4, pp. 11371-11387, (2008). © 2009 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited. Author version. The published version is available at: https://doi.org/10.1364/OE.17.011371 |
IV. Harald Hovland, (2013), “Construction and demonstration of a multispectral tomographic scanning imager (TOSCA)”, Optics Express, Volume 21, Number 4, pp. 4688-4702, (2013). © 2013 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited. Author version. The published version is available at: https://doi.org/10.1364/OE.21.004688 |
V. Harald Hovland, (2014), “Experimental tomographic scanning (TOSCA) imagers,” SPIE Proceedings Vol. 9070, Infrared Technology and Applications XL, paper 90700H, SPIE 2014. Copyright SPIE 2014 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. Author version. The published version is available at: https://doi.org/ 10.1117/12.2050971 |
VI. Harald Hovland, (2014), “Spin scan tomographic array-based imager”, Optics Express, Volume 22, Number 6, pp. 31999-32015, (2014). © 2014 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited. Author version. The published version is available at: https://doi.org/10.1364/OE.22.031999 |