563 KB21 KB198520251997Đonlagić, DaliĐonlagić, DenisZavršnik, Mihaletnik:27številka:3str. 188-194ISSN:0352-9045COBISSID:3218710URN:URN:NBN:SI:doc-6RICAKI9slStrokovno društvo za mikroelektroniko, elektronske sestavne dele in materialeInformacije MIDEMmeritveoptični sistemiregulacijasenzorjitemperaturaPolarimetrični temperaturni senzor| analiza polarizacijskega ločitvenega razmerja in dolžine senzorskega dela| Polarimetric temperature sensor| extinction ratio and sensing length examination|Temperature is one of the most important prameters to be measured in industrial process control. The primary reason for interest in industrial fiber optic temperature sensors is their electromagnetic immunity and electrical passivity. This enables the use of fiber optic sensors in electromagnetically hostile and hazardous environments. During the last decade, many intrinsic optical fiber temperature sensors have been proposed using the Michelson or Mach-Zehnder configuration. However, those interferometers suffer low selectivity and require a well isolated and undisturbed reference arm that is very hard to produce. An alternative to the classic interferometry is a polarimetric sensor which uses the interference of two polarization eigenmodes in high birefringence fibers. We theoretically and experimentally investigated the influences of the sensing and lead fiber length, the extinction ratio of the input polarizer and the coherence properties of the light source for polarimetric temperature measurements. We have shown that there is a possibility to construct a relatively simple and inexpensive fiber optic polarimetric thermometer for absolute temperature measurements by using a low ER polarizer and a low cohernet source. The proposed polarimeter does not exhibit high sensitivity. However, it is easy to achieve a large unambigous range with a resolution below 0.1 oC which satisfies most demands in many industrial and medical applicationsAnalizirali smo vpliv polarizacijskega ločitvenega razmerja vhodnega polarizatorja, koherenčnih lastnosti svetlobnega vira in dolžine senzorskega in dovodnega vlakna na polarimetrične meritve temperature. Iz rezultatov je razvidno, da je možno z uporabo polarizatorjev z nizkim polarizacijskim ločitvenim razmerjem in minimalno dolžino dvolomnega optičnega vlakna ter nizko koherentnim virom svetlobe realizirati cenen polarimetrični termometer z omejeno občutljivostjo. Izveden je bil temperaturni polarimetrični senzor za absolutne meritve temperature, ki delujejo v področju od 40 0C do 60 oCTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaStrokovno društvo za mikroelektroniko, elektronske sestavne dele in materiale