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Compact Fluorescent Lights for Calibration of Spectrometers


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The Compact Fluorescent Light (CFL) is an effective and cheap calibration light source for spectrometers - recently I discovered a source of 12V bulbs which has allowed me to make safe effective lights for portable use in the field.

I have attached a version of the spectrum of a CFL bulb I have generated to allow easy access to the information required for calibration, annotated with the wavelengths of the main lines. I am indebted to Wikipedia for the source information on which this is based.

For comparison I also include an annotated solar spectrum, a comparison of the CFL with RELCO spectrum, and a couple of versions of LED spectra. The easy of the use of the CFL spectra becomes evident when looking at this selection of spectra, although the RELCO gives more lines and is more useful for high resolution spectrometer calibration. The solar spectrum has the right number of lines but is by definition not available at the time of day (or night) when we most need it!

I have posted more information on my attempts at creating adequate calibration lights for spectroscopy on my club's blog here:

https://roslistonastronomy.uk/category/spectroscopy/calibration-spectra

It is worth noting that I have received advice on other topics on this forum that have recommended RELCO starter bulbs for calibration lights and I have created such a light and am in process of trying to identify the lines on that light - but further conversation on that will continue on those topics. For folks like me new to spectrometry, looking for an immediate calibration solution (even if not the best) the CFL bulbs provide a readily accessible solution.

Andy

 

CFL Spectrum annotated with lines Sept 2018d.png

DIY Spectrometer CFL spectrum vs RELCO starter spectrum Sept 2018.jpg

Fraunhoffer Lines with elemental lines annotated Sept 2018.png

Spectrum of LED strip light 220918@1820 white-XAxisProjection.bmp

Spectrum-from-white-light-calibration-light-source-from-ebay-030918II.png

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The 12V Compact Fluorescent Light Bulbs I have purchased come in two flavours – 2700K and 6400K (later is daylight). Tonight, I took spectra of both types using my CCDSPEC spectrometer to determine whether the peaks shown on the spectra were the same. It turns out that they are and hence can be readily used for calibration purposes on my spectrometers. The main difference between the two is the intensity of the peaks with the 2700K light bulb having much lower intensities than the 6400K light bulbs.

Andy

Spectrum-CCDSPEC-CFL-12V-2700K-vs-6400K-single-y-axis-240918.png

Spectrum-CCDSPEC-CFL-12V-2700K-vs-6400K-two-y-axes-240918.png

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