National Repository of Grey Literature 41 records found  beginprevious40 - 41  jump to record: Search took 0.00 seconds. 
New type of a birefringent barrier element for narrow-band chain filter
Melich, Radek ; Melich, Zbyněk ; Šolc, Ivan ; Klimeš st., J. ; Klimeš ml., J.
It is described a design of an inclination-tunable barrier element that is solved as a Šolc type birefringent filter. The element consists of two subfilters that are built up of oblique cut plates. This oblique cut provides possibility of continuous tuning by an inclination in only one axis. Furthermore, it is described a principle how to get subfilter tuning values so that only the main filter wavelengths is transmitted. It is proved functionality and performance of considered barrier at two wavelengths.
Measurement of the Basic Material Characteristics forTransmission of Chain Filter
Melich, Radek
Observing the Sun with birefringent filters is done mainly with filters tuned constantly on some interesting spectral wavelength. However, a new problem that solves tuning of these filters by a temperature change, meets a problem of a insufficient accuracy of dispersion dependences which are used for calculation of transmission at the exact wavelength and the exact temperature. Designing a filter that reaches an extreme small value in its FWHM (e.g. 0.05 nm) it is then very important to determine birefringent dependency with a sufficient accuracy. The paper shows the technique of getting such dependencies, then it mentions a mathematical process suitable for getting the transmission of Solc filter and finally it compares data got from an experiment with computed data.

National Repository of Grey Literature : 41 records found   beginprevious40 - 41  jump to record:
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