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NIR technology in measuring the Brix ( Sugar content) in waterMelon

Wael Haddadin
Prodigy 40 points

Good Day

Anyone, how can I measure the Brix of watermelon (non destructive Method)

can I use NIR or other technology or a combination of technologies to measure sugar content in watermelon.

thanks  

  • 0
    Prodigy 70 points
    Hi, this is a more about how to, than about this NIR instrument.
    Nevertheless, googling "Brix of watermelon" and "sugar content in watermelon by nir" will give you a lot of examples howto.
    Sorry if it looks like teachers note - it is not. I am partially in bussiness with FTIR instruments.
  • 0
    TI__Guru 54705 points

    Hello Wael,

    In the NIR region of the spectrum, typically these kind of measurements fall under "chemo-metrics".  For the particular fruit (and variety) you make many measurements then use say a refractometer to measure the BRIX value of the samples. 

    This builds a correlation library against which you can later compare to samples that you do not need to use the refractometer on.  The sample value must be large enough to cover the expected statistical and measurement variations.  This would likely mean hundreds to thousands of samples to start with.

    The second complication I can see with watermelons is the thickness of the rind might make this measurement very difficult.  The penetration depth of the light is almost certainly less than the thickness of the rind.

    I hope this is helpful.

    Fizix

  • 0 in reply to Fizix
    Prodigy 40 points
    Thank you very much for your reply above
    I agree the thickness of the rind is a problem, is there a way to make the penetration of the light deeper, or is there another technology I can use at the same time with NIR to achieve more accurate reading??
  • 0 in reply to Wael Haddadin
    TI__Guru 54705 points

    Hello Wael,

    Unfortunately, this is not an easy question.  Simply adding more light will not help since this is a penetration problem, the same relative signal at different depths will remain the same.

    What I mean, is if you put in twice the light, you will get more light penetration, but the return signal will be doubled for all depths.  In other words if you original got back x from 1 cm and y from 2 cm depth, then you will get back 2x from 1 cm and 2y from 2 cm.  Still the same relative ratios.

    I do not know of any other technology that will have a different result.  This is a fundamental property of diffusion media.

  • 0 in reply to Fizix
    Prodigy 40 points

    I thank you very much for your reply

    I do understand your reply and I highly appreciate it,,,but what depth does the light penetrate using TI Nano Tech

    as I understand the 700-1100 is the best penetration can you please elaborate if possible.

  • 0 in reply to Wael Haddadin
    TI__Guru 54705 points

    Wael,

    That is not a question I am able to answer.  It depends a good bit on the material, the more turbid, the less the penetration.  Grapes for example tend to have much better penetration than say an orange.

    Fizix