Two recommendations:
1) Add an OSI Read VI for N wavelength spectra that returns each wavelength spectrum as a waveform (i.e. an N x number of channels array of waveforms). This will provide the time stamp of each wavelength spectrum, and will also be more efficient that reading one set of channel wavelength spectra at a time.
2) Add a VI that applies the wavelength scaling to wavelengths. This will allow the user to apply their own power spectrum peak search algorithm to wavelength spectra, whilst still applying the current wavelength scaling algorithm. This will free the user from having to use the OSI peak search algorithm.
We have found that the peak search algorithm utilised by NI-OSI performs poorly when the peaks in the power spectrum are poor quality, and that a much simpler algorithm yielded far better performance. Our algorithm was to simply report the maximum power wavelength in the sensor wavelength range if it was above a minimum threshold. This is in significant contrast to the NI-OSI algorithm that searches for peaks across the entire power spectrum using four algorithm tuning parameters, identifying all of the detected peaks that fall within the sensor wavelength range, and then reporting the one with maximum wavelength.
For reference, we have a PXIe-4844, and are using NI-OSI 16.0.
