Publication details
Algoritmus pro automatické nastavení vzorku do fokusační roviny laseru v sestavě laserové spektroskopie (LIBS)
| Title in English | Autofocus algorithm in a LIBS setup based on searching the best in-focus image |
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| Authors | |
| Year of publication | 2008 |
| Type | Article in Periodical |
| Magazine / Source | Jemná mechanika a optika |
| MU Faculty or unit | |
| Citation | |
| Field | Optics, masers and lasers |
| Keywords | automatické zaostřování; ostrost obrazu; LIBS; Frourierova transformace; Pearsova korelace; digitální šum |
| Description | The article describes automation of 2-dimensional surface analysis in the aparature for laser spectroscopy (LIBS). Such analysis give us 2D map of presented chemical elemnts. The main part is dedicated to algorithm choosing suitable for evaluation of the image sharpness. Digital camera and ablation laser share the same focusing optics, so knowing the exact image sharpness it is possible to set sample object to focal plane. There are theoretically described and experimentally tested different kinds of method how to obtain a relative sharpness number: gradient based method and methods working in frequency domain. Digital noise phenomenon is also discussed. As an output its speed, accuracy and durability against digital noise. |
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