Vpliv površinske hrapavosti na prehod svetlobe skozi polikarbonatne plošče

Mihorko, Katja (author), Drevenšek Olenik, Irena (mentor), Grlj, Nataša (co-mentor)

Pri signalnih svetilkah v avtomobilski industriji se v zadnjem času uveljavlja uporaba hrapavih površin na transparentnih komponentah, preko katerih se svetloba propagira od izvora na cestišče. V okviru magistrskega dela smo proučevali vplive, ki jih imajo različno hrapave površine na svetlobno porazdelitev laserskega snopa po prehodu vzorca s hrapavo strukturo. Proučili smo osem vzorcev, pri čemer je imel vsak od njih na izstopni strani implementirano drugačno hrapavo strukturo. Izbrani polikarbonatni (PC) vzorci so bili narejeni s procesom brizganja, njihova hrapava struktura pa je bila ustvarjena s kemičnim jedkanjem. Porazdelitev svetlobe, ki nastane po prehodu laserskega snopa preko vzorčnih ploščic s hrapavo strukturo, smo posneli s CCD kamero in proučili njene simetrijske lastnosti ter ponovljivost preko celotnega vzorca. S pomično fotodiodo smo posneli prečne profile prepuščene svetlobe in jih primerjali med seboj. To smo storili za pravokoten vpad svetlobe na vzorec in za poševni vpad pri treh različnih kotih glede na normalo vzorca. Hrapavo strukturo smo opazovali skozi optični mikroskop, 3D površinsko morfologijo pa smo posneli s kontaktnim profilometrom. Izvedli smo tudi izračun prehoda svetlobe skozi izmerjene linearne profile v okviru žarkovne optike in dobljene rezultate primerjali z meritvami.

• Language: Slovenian
• Keywords: optika, optična transmisivnost, površinska hrapavost, kontaktna profilometrija, polikarbonati
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FMF - Faculty of Mathematics and Physics
• Year: 2018
• PID: 20.500.12556/RUL-99942
• COBISS.SI-ID: 3179620
• Publication date in RUL: 24.02.2018

Secondary language

• Language: English
• Title: The influence of surface roughness on the propagation of light through polycarbonate plates

Abstract

For signaling lamps in the automotive industry, the use of rough surfaces on transparent components has been used recently, through which light propagates from source to road. In this master's thesis, we therefore began to study the effects of different rough surfaces on the light distribution at the transition of the laser beam of the final dimensions through a sample plate with a rough structure. We examined eight samples, each of which had a different rough structure implemented on the exit side. The selected polycarbonate samples were made through the injection moulding process, and their rough structure was created by chemical etching. The light distribution generated after the laser beam passes through the sample plates with a rough structure was analysed with a CCD camera and we examined the symmetry and consistency of the light distribution over the entire sample. With the photo-diode on the translator we analysed the transverse light-distribution profiles and compared them with each other. This was done for a perpendicular light incident on the sample and for three different examples of light incident at an angle relative to the normal of the sample plate. The rough structure was observed through an optical microscope, and the 3D profile was recorded with a contact profilometer. Within the ray optics we also calculated the propagation of light through the measured linear profiles and compared the obtained results with the measurements.

• Keywords: optics, optical transmissibility, surface roughness, contact profilometry, polycarbonates