Absorpcija svetlobe vidnega in UVA dela spektra v vodi : diplomsko delo

Grobljar, Urh (avtor), Bavdek, Gregor (mentor)

V diplomskem delu predstavim absorpcijo svetlobe v vodi in povezavo z atenuacijo. V teoretičnem delu opišem fizikalne procese, zaradi katerih molekula vode preide v različna vzbujena stanja - elektronska, vibracijska in rotacijska. Razlog za absorpcijo v UV in vidnem delu spektra elektromagnetnega valovanja so vzbuditve elektronskih stanj. V zvezi s tem predstavim koncept molekulskih orbital, ki je ključen za razumevanje elektronskih nivojev v molekuli. V eksperimentalnem delu diplomske naloge se osredotočim na merjenje padca gostote svetlobnega toka pri valovnih dolžinah λ=633 nm in λ=405 nm ter v UVA delu spektra Sončeve svetlobe v odvisnosti od globine vode. S prilagajanjem krivulje izmerjenim podatkom sem določil koeficient absorpcije in ga primerjal z vrednostmi iz literature. V sklepnem delu diplomskega dela ovrednotim teze, postavljene na začetku dela.

• Jezik: Slovenski jezik
• Ključne besede: absorpcija v vodi, molekulska orbitala, vzbujena stanja molekule, UVA
• Vrsta gradiva: Diplomsko delo/naloga
• Tipologija: 2.11 - Diplomsko delo
• Organizacija: PEF - Pedagoška fakulteta
• Založnik: [U. Grobljar]
• Leto izida: 2017
• Št. strani: 29 str., [2] str. pril.
• PID: 20.500.12556/RUL-95223
• UDK: 53(043.2)
• COBISS.SI-ID: 11711049
• Datum objave v RUL: 19.09.2017

Sekundarni jezik

• Jezik: Angleški jezik
• Naslov: Light absorption from uva to visible part of spectrum in water

Izvleček

The topic of my bachelor’s thesis is absorption of light in water and connection with attenuation. The theoretical part of the thesis comprises physical processes due to which the water molecule turns into different excited states. These are electronic, vibrational and rotational states. The excited electronic states are the reason for absorption in UV and visible part of electromagnetic spectrum. In relation to this, the thesis also includes a concept of molecule orbitals. The concept is essential for understanding of electronic levels in a molecule. The empirical part of the thesis is based on the measurement of light attenuation at wavelengths λ=633 nm and λ=405 nm, and also in the UVA part of the sunlight spectrum in dependence of water depth. The coefficient of absorption was determind by fittiing the curve to measured data and compared with values in literature. Finally, the theses stated at the beginning of my bachelor’s thesis are assessed.

• Ključne besede: physics, fizika