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DLP NIRscan Nano EVM with problem

Andre Coelho Donadel
Prodigy 40 points
Other Parts Discussed in Thread: DLPC150

Hello.

My name is André Donadel and recently I purchased three units of DLP NIRscan Nano EVM devices, directly on the Texas Instruments website. However, one of them is having problems with spectra acquisition.

I updated the DLPC150 and TIVA software since there were updates available on the Texas website. The device itself is turning on normally (turns on the lamps and the Bluetooth turns on and works correctly too). However, when scanning a sample, it does not appear an IR spectrum, but only a very low-intensity noise. It is important to mention that the other two devices purchased in the same order are working correctly. 

In the attachment to this conversation, I am sending the CSV files of a sample read after the reflectance standard (the reflectance standard used was barium sulfate).

Thanks for your attention.

Regards,

André Donadel

6443.NIR 6100151.csv

0523.NIR 6100151II.csv

7331.NIR 6100151III.csv

  • 0
    TI__Mastermind 23070 points

    Hello Andre,

    Welcome to DLP  forum and thank you for your  interest in DLP technology.

    I appreciate you uploading the CSV file. It is very helpful.  I want to highlight two fields from the CSV file,

     1. Scan configuration - hadamard

    2. PGA Gain - 64

    The Hadamard scan has multiple columns ON simultaneously, as a result the light intensity to detector is higher. When you combine that with a PGA gain of 64, the detector signal is getting saturated /overflow.  As a result you are seeing this effect.

    Please try following and it should fix the issue:

    1. Change scan configuration to column scan

    or 

    2 Reduce PGA gain to 8.

    Please let us know if this fixes the issue.

    regards,

    Vivek

  • 0 in reply to Vivek Thakur
    Prodigy 40 points

    Hello Vivek,

    thank you for your attention.

    I'm sending you the CSV files with the suggested tests: changing the scan configuration to column scan and reducing the PGA gain to 8 in the Hadamard configuration.

    It is not observed a big difference in the spectrum, considering the acquired spectrum using these suggested conditions and those that I sent you before.

    It is important to mention that the spectra are acquired using barium sulphate with a reflective reference standard.

    Regards,

    André.

    NIR6100151_ColumnPGA64II.csv

    NIR6100151_ColumnPGA64I.csv

    NIR6100151_PGA8.csv

    NIR6100151_PGA8II.csv

    NIR6100151_PGA8III.csv

  • 0 in reply to Andre Coelho Donadel
    TI__Mastermind 28005 points

    Andre,

    Thanks for sharing. The team will review and respond within the next couple of days. Thanks ahead for your patience.

    Regards,

    Philippe Dollo

  • 0 in reply to Philippe Dollo
    TI__Mastermind 23070 points

    Hello Andre,

    Thank you for uploading the CSV file. Could you please run following experiments and upload CSV files:

    1. Scan data using previous scan not factory scan

    a. Use Barium Sulfate ( reflective standard ) with  "new" button under "Scan reference select" section.

    b. Scan the sample with "previous" button selected under   "Scan reference select" section

    Upload the CSV file

    2. Scan data using factory reference

              Scan the sample with "factory" button selected under   "Scan reference select" section

        Upload CSV file.

    Please run this measurement for faulty unit and as well as a good unit.

    That will give more visibility into the nature of problem.

    Thank you for your patience.

    regards,

    Vivek

  • 0 in reply to Vivek Thakur
    Prodigy 40 points

    Hi Vivek,

    thank you for your attention.

    I will do the suggested tests and send you the files for evaluation.

    Regards,

    André

  • 0 in reply to Andre Coelho Donadel
    TI__Genius 12785 points

    Hello Andre,

    We will look forward to hearing your results.

    Regards,

    Austin