my blogs

Update for meteor spectra processing with Python

Instrument Response In a previous blog I have described a Python script with a GUI for calibrating and processing meteor spectra. The spectrum calibrated in wavelength is still not the final result of the processing. One would like to have a plot of energy against wavelength. Unfortunately the measured intensity is influenced by detector sensitivity, … Continue reading Update for meteor spectra processing with Python

Perseid meteor spectrum at OHP

Spectroscopy workshop at OHP Every year, a spectroscopy workshop is held at the site of the Observatoire de Haute Provence, where around 50 spectroscopists, beginners and experts, meet for a workshop with lectures during th day and observing during the night (www.shelyak.com/ohp-spectro-star-party-2019). I used this opportunity to record meteor spectra in a clear sky and … Continue reading Perseid meteor spectrum at OHP

Meteor spectra analysed with Python

Summary This manual explains the use of a Python script for the analysis of video meteor spectra. The theory behind it has been described in (Dubs and Schlatter, 2015): meteor_spectroscopy_wgn43-4_2015.pdf). Until now, the method had been applied successfully to analyse meteor spectra obtained with high sensitive video cams such as the Watec 902 H2 ultimate … Continue reading Meteor spectra analysed with Python

M20171209 spectrum by Koji Maeda analysed

Meteor Spectrum Calibration Example Introduction Meteor spectra can give a lot of information about the meteor, such as composition and temperature. However, for amateurs the calibration of the spectra is not easy. Here a method is given for grating spectra recorded with a video camera, which produces linear spectra with constant dispersion. The method uses … Continue reading M20171209 spectrum by Koji Maeda analysed

Creation and use of flat field for meteor spectroscopy

In astro photography and spectroscopy a flat field is often used to correct for variations of sensitivity over the image sensor. It is applied by dividing the original image by a suitable flat field image, thereby reducing or eliminating these sensitivity errors. The flat image is obtained with the same optics by taking a short … Continue reading Creation and use of flat field for meteor spectroscopy

Atmospheric extinction, Python processing

In a previous blog I have described the use of instrument response for the flux calibration of meteor spectra. One would like to have a plot of energy against wavelength. Unfortunately the measured intensity is influenced by detector sensitivity, grating efficiency, transmission of optics (window, lens, filters) and atmospheric transmittance (all wavelength dependent). The basics … Continue reading Atmospheric extinction, Python processing

New publication about meteor spectroscopy

The method of using an orthographic transformation to linearize spectra is getting used more frequently. A research group from the Beijing National Observatory of Space Environment in China has used the method for the analysis of video meteor spectra and is publishing the results now. Sipeng Yang et. al., MIOS optical subsystem for determining physical … Continue reading New publication about meteor spectroscopy