On the 31st of October measurements of the spectrum of the flashlight used during the ground trials at the GSA observatory were taken. Below is the text version of the summary of experiment and in the link is the version with pictures and results in PDF format (in polish).
The examination of the spectrum of a LED S9 SMTVEK flashlight – PDF version with pictures (in polish)
EXAMINATION OF SPECTRUM OF LED S9 SMTVEK
Mateusz Mazurkiewicz, Jan Struziński
3-SAT Project, Gdynia 31.10.2017
On the 31st October 2017 the measurements of the spectrum emitted by the LED flashlight model S9 produced by SMTVEK were taken. The flashlight has XM-L CREE diodes. The technical documentation of the diodes can be found on the website: http://www.cree.com/led-components/media/documents/XLampXML.pdf
The flashlight has 15 diodes. Ten are shinning bright and placed on the outside part whilst five diodes emit weaker, purple-blue light. In the center there is a red laser situated. The flashlight has three lighting modes corresponding the previously enumerated groups of light sources.
The flashlight is powered with three AAA batteries placed in the basket. The measurement of the voltage at the batteries used in the experiment was taken when the experiment was finished. The equivalent voltage of three batteries was equal to 4.1. volt. The measurement was taken with the use of a MU-02D Altron multimeter.
Measurement system
The measurement was taken with the use of two optical spectrometers connected to the computer., The first one was SPECTRA-1 High Resolution Spectrometer produced by KVANT company. Whilst analyzing the data, the software of the producer was used. The second spectrometer was the PASCO PS-2600 SPECTROMETER. Once again, the software of the producer was used.
In both cases the system seen on the photo below was used. Two hydroplanes with installed flashlight and spectrometer entrance were placed on an optical bench. The measurements were taken with lights out and windows covered in order to limit possible distractions.
Measurements with the use of SPECTRA-1 spectrometer
Three measurements series for the first mode were performed with the use of the first device. During the second measurement series a problem with the software occurred which resulted in the graph of the spectrum not getting recorded, During the third series a mechanical problem occurred – the entrance of the spectrometer was incorrectly placed in regard to the flashlight. The first series was performed without any difficulties. 62 photos were taken. The results are in the attached files.
Measurements with the use of PS-2600 spectrometer
Three measurements were taken. Their results are in the attached files. The results are similar to those obtained with the use of the first spectrometer. It proves their correctness.
