Postavitev za slikanje lasersko povzročenih udarnih valov

zaključna naloga Razvojno raziskovalnega programa I. stopnje Strojništvo

Matic Železnik (Author), Rok Petkovšek (Mentor), Vid Agrež (Co-mentor)

Abstract

Naloga obravnava problematiko postavitve za slikanje lasersko povzročenih udarnih valov v tekočini. Slikanje teh valov zaradi njihove velike hitrosti ni enostavno, razlike v lomnem količniku, ki jih ti povzročijo, pa ne moremo zaznati s klasičnimi metodami slikanja. Metodi schlieren in senčne fotografije omogočata zaznavanje majhnih sprememb lomnega količnika. Na podlagi zahtev obeh metod smo v programu Solidworks izdelali model sistema, ki lahko z večkratno osvetlitvijo senzorja tekom časa ekspozicije zajame ostre slike udarnih valov. Prilagojen je svetlobi z valovno dolžino 800 nm in lahko zajame vidno polje premera 24 mm. Vključuje zaslonko z ostrim robom za potrebe schliren fotografije, z njeno odstranitvijo pa lahko sistem uporabljamo tudi po metodi senčne fotografije. S sistemom lahko slikamo tudi druge pojave, ki spremenijo lomni količnik v transparentnem mediju, kot so na primer kavitacijski mehurčki, mešanje fluidov in konvektivni prenos toplote. Komponente sistema so modularne in jih lahko prilagodimo našim potrebam.

Keywords

diplomske naloge;schlieren;senčna fotografija;udarni valovi;slikanje;lasersko inducirana plazma;optične metode;

Data

Language:	Slovenian
Year of publishing:	2020
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FS - Faculty of Mechanical Engineering
Publisher:	[M. Železnik]
UDC:	533.951:778:535(043.2)
COBISS:	32766211
Views:	558
Downloads:	78
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Setup for Imaging of Laser-Induced Shock Waves
Secondary abstract:	The thesis deals with the problem of setup for imaging laser-induced shock waves in a fluid. Imaging of these waves is difficult due to their high speed, and the differences in the refractive index they cause cannot be detected by classical imaging methods. The schlieren and shadowgraphy methods enable us to detect small changes of the refractive index. Based on the requirements of both methods, we have built a Solidworks model of an optical system that can capture sharp images of shock waves, by repeatedly illuminating the sensor during its exposure time. It is designed for the light with the wavelength of 800 nm and can capture a field of view with a diameter of 24 mm. It includes a knife-edge insert for the needs of schlieren photography, and by removing it, the system can also be used for shadowgraphy. The system can also be used to image other phenomena that change the refractive index in a transparent medium, such as cavitation bubbles, fluid mixing and convective heat transfer. The components of the system are modular and can be adapted to our needs.
Secondary keywords:	thesis;shadowgraphy;shock waves;imaging;laser-induced breakdown;optical methods;
Type (COBISS):	Final paper
Study programme:	0
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. v Ljubljani, Fak. za strojništvo
Pages:	46 f., [2] f. pril.
ID:	12036955