Study of Planck's law with a small USB grating spectrometer

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Authors

NAVRÁTIL Zdeněk DOSOUDILOVÁ Lenka JURMANOVÁ Jana

Year of publication 2013
Type Article in Periodical
Magazine / Source Physics Education
MU Faculty or unit

Faculty of Science

Citation
Web http://stacks.iop.org/0031-9120/48/289
Doi http://dx.doi.org/10.1088/0031-9120/48/3/289
Field Pedagogy and education
Keywords Planck law; optical spectroscopy; USB spektrometer
Description In this paper an experiment studying Planck's radiation law is presented. The spectra of a heated furnace and of a halogen lamp under various conditions were measured with a small USB grating spectrometer and fitted with a Planck law. The temperature determined from the fit was then compared with the results of comparative temperature measuring techniques (e.g. with the measurement of filament temperature from the temperature dependence of filament resistance). We have shown, that even spectrometers with limited wavelength range may be successfully used to study Planck distribution. The temperature obtained from the fit of Planck law to the measured spectra was within the uncertainty close to the results of comparative techniques.
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