LabVIEW Idea Exchange

cancel
Showing results for 
Search instead for 
Did you mean: 
0 Kudos
banksey255

Optical Measurement (NI-OSI) VI changes

Status: Declined

National Instruments will not be implementing this idea. See the idea discussion thread for more information.

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.

4 Comments
AristosQueue (NI)
NI Employee (retired)

Thank you for your feedback. Unfortunately, NI-OSI will not receive any further code changes -- the hardware it supported has been discontinued. There will be no further features, patches, or bug fixes for the NI-OSI.

 

Darren
Proven Zealot
Status changed to: Declined

National Instruments will not be implementing this idea. See the idea discussion thread for more information.

banksey255
Member

Which hardware has been discontinued? The NI PXIe-4844? I ask as the National Instrument website does not state that it has been discontinued.

Mark_P_Murphy
Member

Thank you for your inquiry. The product was discontinued in June 2017. The webpage has been scheduled for removal but was still visible as in certain situations we were able to sell (contracts, agreements, etc.)

 

We apologize for the confusion and thank you for your patience.