This project revolves around a monostatic time of flight LiDAR, monostatic meaning that the emitted light and the incoming light are collocated and LiDAR being an acronym for light detection and ranging. The goal here is to explore and understand the principles of the LiDAR whilst also finding its advantages and shortcomings. One expected shortcoming is that of the effects of light scattering of the laser. To mitigate these effects a short laser pulse is desired without compromising on the power output. In order to reduce the pulse width the electronics of the LiDAR needed to be understood and two approaches emerged. The first revolved around simplifying the electronic schematics of the LiDAR to the point it could be described as a simple RLC-circuit and solving for the current analytically. The other approach was to simulate it using the simulation software LTspice. The results from the analytical approach and the LTspice simulation showed clear ways of how the pulse width could be decreased by altering the onboard resistance, inductance and capacitance. The easiest alternative was to simply reduce the capacitance, however this resulted in a lower power output. But these effects could be mitigated by simply increasing the applied voltage. However it was also discovered that the analytical and LTspice simulations were not entirely correct in their attempts to simulate the real behavior of the laser drive boards within the LiDAR. To study the effects of the scattering two theories were studied, namely Rayleigh and Mie scattering. The influence of Rayleigh scattering was quickly determined to be negligible but the Mie scattering results showed that it will definitely affect the LiDAR, even though the Mie scattering influence was extremely over exaggerated.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:kau-99989 |
| Date | January 2024 |
| Creators | Arketeg, Daniel |
| Publisher | Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013) |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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