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137 Uppsatser om Laser - Sida 1 av 10

Förtolkning inför skogsbruksplanläggning med laserdata (NNH), eller traditionell flygbildstolkning?

The purpose of this study was to investigate produced Laser data from the new national height model's airborne Laser scanning in Sweden, what quality it has and whether it can be used for forest management planning. From airborne Laser scanning one can obtain information on forest variables such as tree species, height, diameter and basal area. Norra skogsägarna is the principal employer of this project and they wanted know to the quality of the Laser data which needs to cope with their standards. If the Laser data the quality required it can replace some of the operations performed by field planners. To examine the quality of the produced Laser data a control tax assessment has been performed in 30 forest departments. This was done in an objective manner.

Samband mellan laserdata och fältdata

To make it easier for forestry planning the forest owners needs data which describe characteristics of the forest. Such data you usually get from some type of inventory. A relatively new technology which probably is getting more important in the future, is Laser scanning because of lower costs. But because the Laser technology is relatively new you need to compare it with conventional inventory technologies to get better understanding of the possibilities the Laser technology gives. This work intends to estimate field measured characteristics of the forest from Laser data with help of regression analysis and then see which of the field measured properties that best could be estimated and which Laser variables that gave the best results. This study shows that heights has the best estimates, but biomass, diameter and volume also gives good estimates.

Förstudie för automatisering av manuell lödning

This degree project has been carried out in cooperation with Enertech AB in Ljungby and is pilot study to automating all current manual soldering. The soldering process accounts for a large part of the processing cost in the production of a heat pump. The process is also a quality risk and has a major impact on the lifetime of the final product.The Main task of this project has been to evaluate automation of the soldering process, to develop automation solutions and a principle layout, to draw the design changes required for the automation and to calculate the supposed solution.This pilot study has resulted in a suggested automation solution using Laser as a heat source for soldering. Calculations of the solution show that a automating a Laser soldering cell is very profitable..

Laserskärning i Sverige : ? tekniken, marknaden och hur de utvecklas

Laser for material processing possesses a number of advantages which mean that it has been and will be an important component for a wide range of industries' future development. Cutting materials processing is the dominant use of Laser technology and has revolutionized the manufacturing industry. The aim of this thesis is to describe the principles of metal cutting by Laser, how Laser cutting is applied in practice and to identify how Swedish companies are using Laser cutting. For the theoretical and technical description of Laser cutting literature studies are the primary source of information. The empirical basis for the mapping of the Swedish industry for Laser cutting is grounded on a survey; this includes Swedish companies that use Laser cutting in their production.

Laserprojektor

This report describes a thesis project on 15hp. The purpose of the thesis project is to build a Laser projector that reacts on sound waves and thus get a Laser beam to draw visualizations of sound waves on a wall. The idea was that the design would be independent and not have to be plugged into any audio equipment. This was achieved by absorbing sound waves into a microphone. Another factor was to get a ?do it yourself? -feeling of the design and therefore it was chosen to be constructed using for example, old hard-drives.The result was a relatively large and bulky designed Laser projector that can draw sound waves on a wall..

Laserinkopplingselement För XFEL Laser Heater : Från Idé Till Färdig Produkt I Designstadie

Uppsala University is involved in a large international collaborationto build the Laser heater system for the European Xray Free-electronLaser in Hamburg, Germany. In this thesis I describe a Laser incouplingdevice into the vacuum chamber of this Laser heater all the way fromthe specifications to a completed design.The Laser heater is a very important part of the XFEL and thepart described here is a part of the vacuum system needed to couplean external Laser into the electron vacuum system and align it withthe electron bunches in order to heat them. The task was started by studying the literature about the basic theory andthe design of vacuum systems. After this study and collection of ideaswith colleagues I started to prepare different concepts to solve thetask. The ideas can be put into two categories, in one case the couplingmirror is located inside the vacuum chamber and in the second caseoutside.

Mätning av stamdiameter med markstående scanner :

Booth for operational planning of harvesting and for long term planning, data is today collected manually. Intensive objective field inventories are usually too expensive. To enhance optimisation of timber flow from forest to industry Moore efficient methods for measuring tree stems of standing trees are needed. The performance of terrestrial Laser scanners have improved and these could possibly be used within forestry in the future. The objective of this study was to validate how a terrestrial Laser scanner could be used to measure stem diameter, and to test how the errors depend on distance from the scanner and tree species. Two plots (one pine and one spruce) were used for this study.

Identifiering av gallringsbehov med hjälp av flygburen laserskanning :

Thinning is one of the most important silvicultural activities in middle aged forests, partly to minimize damages and partly because it leads to earlier harvesting revenues and increases the value of the remaining trees. There are many different indices used to describe stand density and thereby the need of thinning in forests today. Studies have shown that forest variables can be estimated with high accuracy using airborne Laser scanning and it is likely that the method could also be used to estimate forest density indices. In this study, the possibility of using the forest density index ?H² to determine and map priorities for thinning operations for a forest area was examined.

Taktisk högenergilaser i luftvärnssammanhang

Denna uppsats avhandlar möjligheter och begränsningar vid användande avhögenergiLaser för nedskjutning av luftmål. Uppsatsen har inte ambitionen attvara heltäckande över området utan presenterar några av de fördelar ochnackdelar som finns..

Sveplaserns användning till inventering/befästning/kontroll av vägmarkering

The thesis mission is to investigate whether the swiveling Laser that Vectura (former Vägverket Konsult) has in use to measure the road areas and straddle measuring can be used to detect differences in the reflective road markings function. This is to increase use of the swiveling Laser and get rid of the manual measurements performed today.Currently, the measurement of road markings reflective function is performed with both mobile and handheld measuring instruments. The purpose of this thesis is to develop better methods for determination of road markings? reflective function, in order to facilitate the description and suggestions for improvements of the maintenance of road markings reflective function.The questions that the thesis has been to start with are:Can the swiveling Laser detect differences in longitudinal and transverse road markings reflective function?The accuracy of measurement has been sweeping the Laser over the reference instrument (LTL-2000)Is it necessary with a conversion factor for swiveling Laser data against the reference instrument data?To answer the question 2 and 3, there has been a field work in Värnamo where a road stretch with longitudinal road markings and zebra crossing (transverse road markings) has been investigated with a swiveling Laser and LTL-2000.The formulas and calculations contained in the thesis are drawn from scientific reports that are produced by VTI in Linköping. The same formula that was used to calculate the optical measurement data was also used for the swiveling Laser data.

Laserskuren intarsia : ett komplement till äldre intarsiatekniker

The purpose of this report is to explore how modern technology can work againstolder craft techniques. The focus of the research will depend on what conditions areoptimal for cutting marquetry with Laser technology. In my work I account for thehistorical background of the various techniques and then through own practical testsexamine whether the Laser technology can complement the traditional techniques..

3D modelling of a Laser Welding Cell for movie presentation : making of the movie

This report describes a Bachelor thesis work in which a robotised Laser welding cell has been modelled and simulated for the purpose of making a presentation movie. The report shows that the work has been concentrated on making the movie from the modelling phase through the recording of the movie and ending up with the editing of the final presentation movie. A pre-study was made prior the Bachelor thesis work. In the pre-study a literature study was conducted about measurement and calibration of a welding cell. Measurement of almost all equipment in the entire cell was also conducted in the pre-study.

Utredning av laserskärningens materialpåverkan inför drag- och slagprovning : Teknisk Fysik med Materialvetenskap

An investigation of the heat impact of Laser cutting on the material properties when producing tensile and impact test specimens of different steel types of varying thickness has been performed. The purpose of the thesis project was to provide recommendations regarding how much material that needs to be milled from the Laser cut edge before tensile and impact tests. The study has been performed partly by investigating the test specimens by heat camera when the specimens were cut in the Laser cutting line and partly by performing hardness tests, investigation by microscopy, and tolerance and roughness measurements and tensile tests of the Laser cut material and material produced in the traditional multi operation machine. The results show that the heat affected zone in the thicker materials is greater than previously thought of, and that the currently used recommendation has to be adjusted. The study clearly shows that the thicker the material, the greater the heat affected zone, independently of the steel type, since the thicker material takes longer time to cut.

Identifiering av röjningsbestånd med hjälp av flygburen laserskanning

Bergvik Skog is one of the leading forest companies in Sweden who use airborne Laser scanning for forestry information. They utilize Laser data retrieved by the Swedish National Land Survey to describe the forest holdings and facilitate planning for thinning and final felling operations. However, the possibility to identify stands with clearing needs by using Laser scanning data has not been tested in a large scale. The data used in the current study are field data from The Swedish National Forest Inventory in combination with Laser data from the Swedish National Land Survey acquired in 2009. The collected data is used to find one or several Laser variables that best describe the relationship of the field measured samples with clearing needs.

Positionering och kartuppbyggnad med avståndsmätande laser

This master thesis includes a description of how a number of sensors are put together in a sensor platform. It also gives a description of how localization and mapping has been performed with data collected from the sensor platform. Localization is a prerequisite for most of the tasks that can be requested from an autonomous mobile robot. In many situations the GPS signal is not available and hence an additional localization system is required. One approach is to apply localization based on landmarks extracted from the robots surrounding.

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