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1.
Photothermal gas sensing with a custom-made, fiber-coupled Fabry–Pérot etalon
Manuel Tanzer, Benjamin Lang, Matej Njegovec, Vedran Budinski, Simon Pevec, Jure Javornik, Denis Đonlagić, Alexander Bergmann, 2024, original scientific article

Abstract: Growing awareness of the adverse health effects of air pollution has increased the demand for reliable, sensitive, and mass-producible sensor systems. Photothermal interferometry has shown great promise for sensitive, selective, and miniaturized gas sensing solutions. This work describes the development of a macroscopic photothermal sensor system with a sensor head consisting of a low-cost, custom-made, and fiber-coupled Fabry–Pérot etalon. The sensor was tested with NO2, achieving a 3σ limit of detection (LOD) of approximately 370 ppbv (1 s). Exhibiting little drift, a LOD of 15 ppbv is achievable for 200 s integration time. Compensating for the excitation power, the normalized noise equivalent absorption was calculated to be 1.4 × 10−8cm−1 W√Hz. The sensor system is not limited to NO2 but can be used for any gas or aerosol species by exchanging the excitation laser source.
Keywords: photothermal gas, etalon, interferometry, Fabry-Perot
Published in DKUM: 29.08.2024; Views: 77; Downloads: 95
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2.
Umerjanje optičnih in tipalnih trikoordinatnih merilnih naprav
Primož Černič, 2013, master's thesis

Abstract: Sledljivost meritev je osnovni pogoj za zagotavljanje ustrezne ravni kakovosti merjenja. Za zagotavljanje sledljivosti je treba vzpostaviti neprekinjeno verigo primerjav, vse do primarnega etalona na nacionalni oziroma mednarodni ravni. Merilne naprave je treba umerjati s sledljivimi etaloni ali instrumenti po navodilih, ki jih podajajo normativni dokumenti. V magistrskem delu so predstavljeni etaloni, ki se uporabljajo na področju umerjanja optičnih in tipalnih trikoordinatnih merilnih naprav, ter standardi, tehniške specifikacije in vodila za njihovo umerjanje. Normativni dokumenti in etaloni s področja tipalne trikoordinatne merilne tehnike so dobro razviti in standardizirani, medtem ko jih na področju optične trikoordinatne merilne tehnike praktično ni. Ker je optično trikoordinatno merjenje relativno nova tehnologija, so tudi standardi in etaloni še v razvoju. Na Fakulteti za strojništvo v Mariboru je bil razvit etalon za umerjanje optičnih trikoordinatnih merilnih naprav. V magistrski nalogi sta predstavljena postopek za kalibracijo tega etalona in postopek za njegovo uporabo pri preskušanju optičnih merilnih naprav.
Keywords: umerjanje, sledljivost, koordinatna merilna tehnika, standard, etalon
Published in DKUM: 16.12.2013; Views: 2200; Downloads: 295
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