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    Design and Implementation of a Pulsed LiDAR System Based on ToF Method

    , M.Sc. Thesis Sharif University of Technology Dabidian, Sobhan (Author) ; Fotowat Ahmadi, Ali (Supervisor) ; Kavehvash, Zahra (Supervisor)
    Every year millions of people around the world die because of car accidents, most of which are caused by human faults. This has greatly increased the need for advanced driver-assistance systems (ADAS) and self-driving cars. Currently, driver assistance systems rely mainly on radar sensors and cameras to detect various objects and obstacles around the vehicle. Radar, due to its low lateral resolution, and Camera, due to its sensitivity to environmental conditions and lack of distance measurement, do not perform well alone. Therefore, we need light detection and ranging (LiDAR) that measures the distances from objects using laser light. Due to the micrometer wavelength of light, LiDAR can have... 

    Investigation of humidity effect on the air refractive index using an optical fiber design

    , Article Journal of Applied Sciences ; Volume 11, Issue 16 , 2011 , Pages 3022-3027 ; 18125654 (ISSN) Mehrabani, A ; Golnabi, H ; Sharif University of Technology
    In this study operation of an optical design based on the intensity modulation for the refractive index change has been described. The reported instrument measures the transmitted output power depending up on the medium refractive index in the light path of a fiber-to-fiber design. A liquid cell is located between the fibers in the light path and power variations for different cold and hot water levels in the cell are measured. By using a reference humidity meter the calibration curve representing the relative humidity (%RH) as a function of the transmitted output power is obtained. For the hot water with the final temperature of T = 32.7°C the output power range of 255.0 -313.OnW is...