|
| |
|
|
Processes which control the Earth’s Temperature
Oupický, Pavel
There are discussed in this paper some of natural processes which control the temperature of Earth and they are explained and confronted with climate models Daisyworld, Greenhouseworld and Moses. There are presented also the results from the measuring of plant reflectivity with spectroradiometer
|
|
| |
|
| |
|
|
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.
|
|
|
Schmidt-Cassegrain Telescopes
Jareš, Daniel ; Lédl, Vít ; Rail, Zdeněk
This paper describes analysis of residual aberrations of Schmidt-Cassegrain telescopes (SCT). Though SCTs have been produced for 30 years, problem of imaging properties is only rarely discussed. At first we have performed measurement of optical parameters of several commercially produced SCT telescopes of Meade, Celestron and Carl Zeiss Jena, then we have used measured data to construct the models of these system with the help of Zemax program and evaluate residual aberrations. We have found that it is possible to radically improve these systems by changing entry data.
|
|
| |
|
|
Imaging system for spectrograph with multichanell Šolc filter
Rail, Zdeněk ; Lédl, Vít ; Jareš, Daniel
Solving the problem of solar spectrograph telescope,we have made research of possible imaging systems for spectrograph with multichanell Šolc filter.We have decided to use off-axis unobstructed Maksutov telescope,which is able to meet our demands for constant solar image scale in wavelenght within 380 to 760 nm.This telescope provides good image contrast similar to apochromatic objective lens uses only classical materials. Diameter of the telescope is 140 mm,focal length is 2000 mm.
|
|
|
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.
|
|
| |
guest ::
