Since p4: access to webcam settings, should be possible to control these parameters (depending on webcam type). "Save reference spectrum" only work reliable in "Intensity" mode. Using dark spectrum + reference spectrum at once does not work reliably (actually also not neccessary).=> Implement live view for "Raman shift" as x axis + live baseline correction (this function is also already there, but not yet connected to live view).=> Implement sensitivity correction procedure (function already there, not connected to live spectra).For emission type spectra: wavelength-dependent sensitivity of detector not corrected.=> Implement wavelength calibration procedure.linear attribution of wavelength information is possible, but w/o calibration.Limitations of the current version => to be improved: Works astonishingly well:-)Īpplication example: measuring absorbance of coloured decals: Used the USB camera with lens to image the projected spectrum image. Therefore I used the grating for spectrum projection onto a white piece of paper within the slit plane beneath the entry slit. The slit image is much bigger than the little CMOS chip inside the USB camera. Use "Load spectrum Image" from the "File" menu.įor diffraction of light + focusing I used a concave reflective grating. Analyze spectrum images without being connected to a webcam spectrometer.Direct copy&paste via clipboard into Excel and the like. Save data and export into different file formats (spc, dx, csv. Depending on webcam type: also control exposure time, white balance & the like access webcam settings via Windows webcam interface.assign the spectrum's linear wavelength range.visually define the spectrum ROI, that is used for cross-section calculation.clipping warning for blue, green red channel.optionally flip the spectrum, to adjust to the original image orientation.use automated peak labeling during live view.for transmittance/absorbance: save a reference spectrum + automated live calculation of absorbance/ transmitttance.for emission spectra: save a dark spectrum + automated live subtraction of dark.identify each measured spectrum with live time stamp.show a live horizontal cross section as a spectrum within a Spekwin32 plot window.Connect to any webcam, that is recognized by Windows system.It is not perfect, but it works:-) What it does: Today ( Hackaday, April 23), I've invested the bigger part of the day into a quick hack, to demonstrate the potential use of my optical spectroscopy software SPEKWIN32 together with webcam-based DIY spectrometers.
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