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Development of a Spectrogram Analysis Method Using a He-Ne Laser as a Standard Source
Bukyung Jhun
Gyeonggi Science High School, Gyeonggi 400-210
Youngseok Jhun ∗
Seoul National Univ. of Edu., Seoul 137-070
(Received 16 June, 2010 : revised 28 September, 2010 : accepted 15 October, 2010)
In this study, we developed a new method to analyze a spectrum quantitatively. In this way a beam of laser is used to be diffracted by the grating in the spectrometer with the light to be analyzed, so that the spot of the diffracted beam can be used as a reference for the wavelength measurement.
We first took a photo of the spectrum and then acquired a graph of intensity vs. wavelength by a computer program. Each test using sodium, argon, and hydrogen discharge tube showed a very precise result within the measurement uncertainty of 3 %. Especially, the new method does not have to use another light source as a reference, so it does not need multiple spectrum pictures. This is expected to be used in various experiments about fundamental conception of light and colour or interaction between light and matter.
PACS numbers: 01.50.Pa
Keywords: Spectrometer, Diffraction grating, Line spectrum, Spectroscopy
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