Izrada sustava za akviziciju signala interferometra za mjerenje pomaka

master's thesis

• Title (english): Design of a laser interferometer signal acquisition system
• Author: Marko Horvatek
• Mentor: Marko Katić (mentor)
• Committee member: Damir Ciglar (predsjednik povjerenstva)
• Committee member: Branko Bauer (član povjerenstva)
• Committee member: Marko Katić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2019-07-11, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Precision Mechanical Engineering

Abstract

Laserski interferometar od svoje pojave pa do danas zauzeo je i održao poziciju kao jedan od osnovnih uređaja u dimenzionalnom mjeriteljstvu. Ovim sustavom moguće je mjeriti velik broj različitih dimenzionalnih veličina kao što su duljina, pravocrtnost i mali kutovi, a njegova velika fleksibilnost omogućuje jednostavno prilagođavanje mjerenju mnogih drugih dimenzionalnih značajki predmeta mjerenja. Prilikom znanstveno-istraživačkog rada često se javlja potreba da se sustav prilagodi pojedinom mjernom zadatku poput mjerenja vrlo malih pomaka visokom rezolucijom i malom brzinom, ili mjerenje velikih pomaka s nižom rezolucijom. S obzirom na nedostatak fleksibilnosti i otvorenosti sustava komercijalno dostupnih laserskih interferometra, pojavila se potreba za razvijanjem vlastitog sustava prema potrebama Laboratorija za precizna mjerenja dužina (FSB-LPMD), Fakulteta strojarstva i brodogradnje u Zagrebu.
Ovim radom, nastavljeno je istraživanje modularnog laserskog interferometra, čiji je razvoj započet u radu „Razvoj modularnog laserskog interferometra za mjerenje pomaka“. Mehanički model razvijenog interferometra izveden je korištenjem Thorlabs komponenti, a kao izvor svjetlosti odabran je helij neonski laser (proizvođač Lasertex) zbog relativno veće stabilnosti frekvencije naspram drugih laserskih izvora. Unaprjeđenjem sustava za detekciju i procesiranje signala, omogućeno je praćenje pomaka pomičnog kraka interferometra znatno veće brzine. Proces razvoja bitno je ubrzalo korištenje programa za simulaciju elektroničkih sklopova Tina TI uz čiju su pomoć određeni optimalni parametri električnih komponenti sustava. Eksperimentalni dio je započet ispitivanjem pojedinačnih komponenti, njihovom integracijom u jedinstveni sustav za obradu signala te konačno integracijom tog sustava u laserski dinamički interferometar.
Razvijeni sustav ima mogućnost detektiranja smjera i iznosa pomaka, a njegova je točnost ispitana na udaljenostima do 180 mm uz brzine pomaka do 600 mm/s.

Abstract (english)

From the time of its invention to this day, laser interferometer is one of the crucial instruments in dimensional metrology. Given its great configuration flexibility, this device makes it possible to measure a wide variety of dimensional features such as length, straightness and small angles, as well as a lot of other dimensional features. Through scientific research there is a common need for adjustment of measuring systems to the specific requirements of the task, such as measurement of small displacements with great precision or measurement of large displacements with lower žprecision. With no commercial open-source systems available, the need for development of a custom specified laser interferometer system appeared. The interferometer system was developed with the requirements of the Laboratory for precise measurement of length at the Faculty of Mechanical Engineering and Naval Architecture in mind.
In this paper, the research of modular laser interferometer started in „Development of a modular laser displacement interferometer“ was continued. Mechanical setup of the developed interferometer system was designed using Thorlabs components. In contrast to the previous experiments, the source of the light was changed and replaced with He-Ne Lasertex laser, which offered better frequency stability. Upgrades implemented on system for detection and count of interference fringes enabled movements of the variable position mirror utilizing significantly higher speeds. The usage of simulation software Tina TI has considerably accelerated electronic system development process. In the experimental part of this paper experiments on individual parts, as well as experiments on assembled electronic circuits were performed. The experimental part was completed with testing of the assembled version of the laser interferometer prototype.
Developed prototype has the ability to detect the direction and the amount of displacement, which was tested on lengths up to 180 mm with speeds up to 600 mm/s.

• Keywords: interferometar; brojanje pruga; detekcija pruga
• Keywords (english): interferometer; fringe counting; fringe detection
• Language: croatian
• URN:NBN: urn:nbn:hr:235:143790
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2019-07-09 08:39:33