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too much noise

SEUNGYEON RYU
Prodigy 40 points

I've tried to measure MSG level using the sensor, However, it makes too much noise and unusual result I can see.

How can I reduce the noise? 

  • TI__Mastermind 48520 points

    Hello Seungyeon,

    Please tell us the following:

    1. First, which unit you are using.  The NIRscan original or the NIRscan-Nano?
    2. How are you taking a reference?  Or are you using the factory reference?
    3. What are your scan paramters?
    4. If this is the NIRscan-Nano, are you placing the sample directly against the window?  If not you should hold it directly against the window.

    This scan looks like what I would expect if you are using the sample as the reference.

    Fizix 

     

  • in reply to Fizix
    Prodigy 40 points

    1. I'm using DLP® NIRscan™ Nano Evaluation Module.

    2. I took the reference with the empty bottle and I put the contents then I scanned.

    3. 900-1700nm

    4. I did the sample in line with the window. Yes

    I'm wondering why normally it doesn't make absorbance rate? Also it used to stop while scanning(GUI). 

    I did the new test with orange/ it shows like this

    : I am wondering about the noise( absorbance spectra is corrupted and noisy) --- how can I reduce it? 

    Thanks

  • in reply to Fizix
    Prodigy 40 points
    Could you kindly refer to my reply below?
  • in reply to SEUNGYEON RYU
    TI__Mastermind 48520 points

    Hello Seungyeon,

    Scanning the bottle in the way that you describe is not valid for this type of system.  You would need to put something on the other side of the bottle (like spectralon) to make a transflectance measurement.

    What happened is that most of the light passed through the bottle and out into space.  Even with the sample in the bottle again most of the light passed through.

    What you need for this measurement is something like spectralon.  This is described in the user guide http://www.ti.com/lit/ug/dlpu030f/dlpu030f.pdf on page 28. 

    The graph of the orange looks to me like you used the existing bottle scan as your reference.  You need a new reflectance reference as described in the user guide.

    Reflectance or Absorbance needs a reference.  Basically it is answering the question, "How much more did my sample absorb than this reference material?" or, "How much light did the sample reflect compared to this reference material?"  Therefore you need a highly Lambertian and reflective substance as a reference, which is what spectralon was designed to be.

    I hope this is helpful.

    Fizix