Quality assurance is an important part of many industrial processes that involves different methods of determining the quality of a product. One of these methods is deflectometry, a method that uses a display to show patterns and a camera to capture the reflection of these patterns through a specular object which is being measured. The goal and end result of these measurements is a height profile of the object's surface. While there are many ways of performing deflectometry through using different types of patterns and setups, this project focuses on using only a single smartphone to capture all data required for measurements. This involves showing a sequence of patterns on the smartphone's display and using its front-facing camera to capture the reflection through the specular object. The patterns chosen for this purpose are binary checkerboard patterns that are simple enough for the camera to capture in a good way and efficient enough to perform the calculations in a reasonable time frame. Using this method, the ability of a smartphone to perform deflectometric measurements was evaluated by testing on several different types of mirrors as well as on a real car body. The method can produce results that closely replicate the real world object and can calculate quantities that are used to measure the quality of car assembly, often with an accuracy of well under 1 mm. The method can handle a large variety of reflective objects at varying distances and form while only requiring some known parameters of the smartphone used in testing.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:umu-175309 |
| Date | January 2020 |
| Creators | Wiklund, Joakim |
| Publisher | Umeå universitet, Institutionen för fysik |
| 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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