izpis_h1_title_alt

Spektralne komponente optičnega toka ob uporabi pulzno-širinske modulacije
Velkavrh, Blaž (Author), Slavič, Janko (Mentor) More about this mentor... This link opens in a new window

.pdfPDF - Presentation file, Download (6,68 MB)

Abstract
Poznavanje dinamskega odziva strukture je ključnega pomena pri razvoju in odkrivanju pomanjkljivosti že realiziranih izdelkov. Pri eksperimentalnem določanju dinamskega odziva je zaradi njegove natančnosti pogosta uporaba pospeškomera. Namesto pospeškomera se lahko kot brezdotično metodo uporabi hitro kamero, a je cena take kamere zelo visoka. V nalogi smo kot alternativo hitrim kameram predstavili in uporabili metodo za merjenje premikov s klasično kamero. V primerjavi s hitrimi kamerami je cena izvedbe metode zelo nizka, ločljivost slik pa bistveno višja. Metoda za zajem spektralnih komponent optičnega toka uporablja harmonično spreminjanje osvetlitve. Metodo smo delno spremenili - analogno krmiljenje svetlobnega vira smo nadomestili z digitalnim krmiljenjem s pomočjo pulzno-širinske modulacije. Z metodo smo izmerili amplitude nihanj vzbujane ploščice pri različnih frekvencah vzbujanja. Z zaporednimi meritvami pod enakimi pogoji smo potrdili delovanje metode, pri nižjih frekvencah vzbujanja pa tudi ponovljivost meritev.

Language:Slovenian
Keywords:optični tok, pulzno-širinska modulacija, Lucas-Kanade, fotogrametrija, modalna analiza, generiranje signala
Work type:Bachelor thesis/paper (mb11)
Organization:FS - Faculty of Mechanical Engineering
Year:2018
Views:670
Downloads:195
Metadata:XML RDF-CHPDL DC-XML DC-RDF
 
Average score:(0 votes)
Your score:Voting is allowed only to logged in users.
:
Share:AddThis
AddThis uses cookies that require your consent. Edit consent...

Secondary language

Language:English
Title:Spectral components of optical flow using pulse-width modulation
Abstract:
Knowing the dynamic response of structure is crucial in the development and discovering deficiencies of already realised products. In the experimental determination of a dynamic response, an accelerometer is often used due to its accuracy. Instead of an accelerometer, a high-speed camera as contactless method can be used, but investment in such a camera is very high. In this work, we presented and used a method for measuring displacements with classic camera as an alternative to high-speed cameras. Compared to high-speed cameras, the cost of implementing this method is significantly lower, while the resolution of images is much higher. Method uses harmonical changes in lighting for measuring spectral components of optical flow. We partially changed the used method - we replaced the analogue control of the light source with digital control using pulse-width modulation. We measured the oscillation amplitudes of an excited plate at different excitation frequencies. With successive measurements under the same conditions, we confirmed the validity of the method and the repeatability of measurements at lower excitation frequencies.

Keywords:optical flow, pulse-width modulation, Lucas-Kanade, photogrammetry, modal analysis, signal generation

Similar documents

Similar works from RUL:
Similar works from other Slovenian collections:

Comments

Leave comment

You have to log in to leave a comment.

Comments (0)
0 - 0 / 0
 
There are no comments!

Back