Razvoj in karakterizacija vlakenskega hidrofona

magistrsko delo magistrskega študijskega programa II. stopnje Strojništvo

Emil Zubalič (Author), Matija Jezeršek (Mentor)

Abstract

V več področjih, tako tehnike kot medicine, se pojavi problematika merjenja tlačnih valov v vodnem mediju z visokimi amplitudami in s kratkim trajanjem. Klasični hidrofoni ne morejo pravilno slediti dinamiki pojava, saj je njihova frekvenčna odzivnost prenizka. V ta namen smo razvili vlakenski hidrofon, kjer fizikalni princip ne omejuje hitrosti odziva merilnega sistema, pač pa le odzivnost elektronskih komponent. Takšen hidrofon je zmožen meriti tlačne vale amplitud do 100 MPa in trajanja pod 100 ns. Hidrofon je bil preizkušen na primeru generacije tlačnih motenj z uvajanjem svetlobe laserja Er:YAG v vodo z optičnim vlaknom. Dosežen prag zaznave hidrofona je 9 MPa, z občutljivostjo 0,97 mV/MPa. Predstavljen je tudi način za merjenje hitrosti širjenja parnega mehurčka ob lasersko inducirani kavitaciji, pa tudi možnost štetja in časovne opredelitve kolapsov parnega mehurčka.

Keywords

magistrske naloge;vlakenski hidrofon;tlačni val v vodi;lomni količnik vode;zaznava kavitacije;

Data

Language:	Slovenian
Year of publishing:	2022
Typology:	2.09 - Master's Thesis
Organization:	UL FS - Faculty of Mechanical Engineering
Publisher:	[E. Zubalic]
UDC:	681.883.43(043.2)
COBISS:	119706627
Views:	226
Downloads:	42
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Developement and charachterization of a fiber optic hydrophone
Secondary abstract:	In many technical fields, as well as medicine, there is a need for measuring pressure shockwaves with high amplitudes and short duration. Classical hydrophones prove to be inadequate for such measurements, as their frequency response is too low. We therefore assembled an optical fiber hydrophone, whose functioning principle does not limit the frequency response. Such a hydrophone can measure pressure waves of amplitudes up to 100 MPa and sub-100 nanosecond duration. The hydrophone was tested in conjunction with a shockwave generation system based on absorption of Er:YAG laser light in water, via an optical fiber tip. The achieved measurable shockwave amplitude is 9 MPa, with a sensitivity of 0.97 mV/MPa. A method for measuring the laser induced cavitation bubble propagation speed is also proposed, as well as a method for detection and counting of the number of bubble collapses.
Secondary keywords:	master thesis;fiber optic hydrophone;pressure shockwave in water;water refractive index;cavitation detection;
Type (COBISS):	Master's thesis/paper
Study programme:	0
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. Ljubljana, Fak. za strojništvo
Pages:	XXII, 63 str.
ID:	16279630