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Nirscan Nano EVM

Sam Khoudair
Prodigy 60 points

I'm finding that the documentation is not really clear regarding calibration/correction of data.  Take for example the reflectance values.  Are the values internally corrected due to a factory calibration and therefore the raw values transferred to my excel file are ready to use or is it the case that I need to do some other calibration using, for example, a piece of aluminium as described in the YouTube video relating to the unpacking of the device.  Is there some document regarding this issue? It would really be good to the get the entire story on calibration/correction of raw data for both Reflectance and Absorbance modes.  Any help would be much appreciated.

  • 0
    TI__Genius 10925 points
    HI Sam,

    Welcome to E2E Forums!

    1. The device is calibrated for optical non-uniformity and wavelength positions on the factory floor. This calibration data is used when generating the patterns for scanning. This calibration is not required to be done again.

    2. There is another type of calibration, which is termed "Reference Calibration". This calibration records the data of Lamp intensity at different wavelengths for a given completely reflective sample. This data is then compared with the data obtained from a sample under examination. Comparison of these two sets of data provides the absorbance and reflectance of the sample under examination.
    So in the output CSV file, the "reference" & "sample" columns are just raw ADC values that the device has collected while scanning the reference and the sample under examination. These values should not be used except for comparison between the two datasets. The "Reflectance" and "Absorbance" columns are calculated by comparing these two dataset, so this can be used directly.
    Also, since the lamp characteristics may vary over the time, usage scenario etc so the customer is advised to perform a reference scan in a regular interval of time to keep up the accuracy of the measurements.

    Hope this helps,

    Thanks & Regards
    Hirak.
  • 0 in reply to Hirak Biswas
    Prodigy 60 points

    Thanks Hirak for your easy to understand reply.  Now I can use the nano with confidence.

    Sam

  • 0 in reply to Sam Khoudair
    TI__Genius 10925 points

    Hi Sam,

    Glad to know we could resolve your issue. Thanks for your interest in TI DLP Technology, have a great day! if you are satisfied with our answer, kindly mark that answer as resolved.

    Thanks & Regards,
    Hirak.