Uporaba pospeškomera za merjenje vpliva vibracij na merilni sistem

zaključna naloga

Nika Košir (Author), Miha Škarabot (Mentor), Marion Van Midden (Co-mentor)

Abstract

V zaključni nalogi so predstavljene meritve vibracij s piezoelektričnim merilnikom v prostoru, kjer je vrstični tunelski mikroskop (VTM). Pri vrstični tunelski mikroskopiji mora biti mikroskop mehansko čim bolj ločen od okolice, saj za proučevanje površine uporablja konico, ki se nahaja tik ob površini, razdalja med njima pa mora biti konstantna. Najprej smo preverili delovanje na vseh frekvenčnih območjih, nato pa smo merili vpliv vibracij na mizi vrstičnega tunelskega mikroskopa. Ker so zunanje motnje pomembne za delovanje VTM, smo jih merili pri različnih pogojih. Vibracije iz okolja smo dušili s pnevmatskimi nogami, za katere smo ugotovili, da zmanjšajo nivo določenih vrhov za približno 10 dB. Ko smo prižgali rotacijsko in nato še turbo črpalko, se je intenziteta vibracij pri vklopu posamezne črpalke povečala za približno 10 dB.

Keywords

vrstična tunelska mikroskopija;vibracije;frekvenčni spekter;pospeškomer;piezoelektrični senzor premikov;nihanje;

Data

Language:	Slovenian
Year of publishing:	2021
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FMF - Faculty of Mathematics and Physics
Publisher:	[N. Košir]
UDC:	534.1
COBISS:	71842051
Views:	459
Downloads:	46
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Using an Accelerometer to Characterize the Influence of Vibrations on the Measuring System
Secondary abstract:	In this thesis piezoelectric measurements of vibrations of a room with a scanning tunneling microscope (STM) are presented. When performing scanning tunneling microscopy, a sharp conductive tip that must be kept at a constant distance from the sample and the microscope has to be mechanically as separate from the surroundings as much as possible in order to achieve maximum resolution. First, functionality check over a broad frequency range was performed. Next, the influence of forced vibrations to the STM table under various conditions was investigated. In order to dampen externally induced vibrations, pneumatic table-legs were used. Our experiments have shown that the use of pneumatic legs decreases vibrations up to \SI{10}{dB}. In addition, an increase of \SI{10}{dB} in vibration intensity was detected after using a rotary or turbo pump.
Secondary keywords:	scanning tunneling microscopy;vibrations;frequency spectrum;accelerometer;piezoelectric movement sensor;oscillations;
Type (COBISS):	Final paper
Study programme:	0
Thesis comment:	Univ. v Ljubljani, Fak. za matematiko in fiziko, Oddelek za fiziko
Pages:	[6] f., 25 str.
ID:	13160426