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National Repository of Grey Literature 6 records found  Search took 0.00 seconds. 
Design of birefringence filter for HeI and CaII line in near IR spectral range
 Melich, Radek ; Melich, Zbyněk ; Šolc, Ivan ; Klimeš st., J. ; Klimeš ml., J.
Spectral sensitivity of today’s CCD chips allows observing in near IR spectral range. Solar observations on astronomically interesting spectral lines of Helium and Calcium in near infra-red region have not yet been done in the Czech Republic. The paper deals with a design of birefringent filter of Šolc type for wavelengths 10830 Å (HeI line) a 8542 Å (CaII line) that would enable such observation.
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The measure device for measuring and control of light conditions of plant growth
 Melich, Zbyněk ; Melich, Radek ; Oupický, Pavel ; Šolc, Ivan ; Klimeš st., J. ; Klimeš ml., J.
Šolc birefringent polarizing filter for more spectral lines Šolc birefringent polarizing narrow - bandpass filters are successfully used for professional observations of solar chromosphere. They are usually constructed to work for only one transmitting wavelength. Principally it is possible to design such filters to transmit more narrow – banded spectral lines. Filter consist of two parts: Frontal part is broad – band filter, with which, required spectral line can be adjusted. Second – main part consists of 26 quartz plates. Filter is designed for observation of Sun in interesting spectral lines: KII, HY, BaII, HZ, D1, D3 and He.
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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.
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Chain filters with oblique angle of cut of birefringent plates
 Melich, Zbyněk ; Šolc st., Ivan ; Klimeš st., Jan
In this paper results and test data are mentioned of three types of narrowband chain polarization-interference filters using birefringent plates with common angle cut with respect to optical axis of crystal. These filters were successfully used as frame filters tuned by tilt in front of main chromospheric filter, transmitting more interesting spectral lines.
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Existing experiences with an observation with a filter in “K” line
 Klimeš st., Jan ; Melich, Zbyněk ; Šolc, Ivan
In this article a new modification of a Solc filter prototype and results from testing chain Solc filter in K line are stated. Mainly the results obtained from filter configurations for different bandwidths.
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Chain Filter Compound of Birefringent Plates with an Inclined Angle Cut
 Melich, Zbyněk ; Šolc, Ivan ; Klimeš st., Jan
In this article a new solution of a shortbanded chain polarization-interference filter is studied. Birefringent plates with common inclined angles are used for this purpose. Because of a right choice of the angles it was achieved linearization of spectral tuning by inclination of the filter.
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