Fuzzy Data: Measuring Dry Matter & Brix Non-Destructively in Kiwi [WEBINAR RECORDING]

December 19, 2019 at 3:30 am | Updated December 19, 2019 at 3:30 am | 2 min read


What is the correlation between DMC and SSC in relation to the harvest date in Kiwifruit?

Different regions have different target DM and target SSC.  These are often set by the local growers’ trade organization or by the packing house and sometimes set differently for fruit bound for domestic sale or export.  General values can be obtained through the terrific public information published by the UC Davis Postharvest Center.  They have web pages and apps that show quality metrics for many different fruits.

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Have you done repeatability tests (i.e., multiple measurements of the same fruit on the same point) and what did the results show you?

The validation data from our internal validation testing is available publicly on our website.  It will allow you to see repeatability as well as variation between measurements and between instruments.


Will there be the ability to model for color of the fruit?

We worked with Plant and Food NZ to build a model on the F-750 based on Hue Angle.  This feature was not built into the F-751.  We will consider it.


Can the GPS be added to F-751 Kiwi Quality Meter?

All F-750’s and F-751’s are equipped with GPS.


Will FruitMaps be able to upload map imaging files that we already have so we won’t have to re-create these?

Yes.  If you send us your KML or other mapping data, we can import it to your account.


Does it use the reflectance NIR measurement technique?

The instruments use interactance measurements wherein light penetrates the fruit and reflects back into the spectrometer.  We distinguish the light reflected off the external surface of the fruit based on the angle at which it re-enters the instrument.  We subtract the direct reflectance from the scattered reflectance to only analyze the light that has interacted with the internal flesh of the fruit.


What kind of batteries does it take?



Can we see the precision (i.e., multiple measurements on the same fruit)?

Precision is 5% of measured value.  That is about +-1%DM for a fruit that is 20% dry matter.


Is there temperature compensation?

Yes, both in the hardware, as well as within the calibration model.


Can the SSC model be used in the sorting line to classify the fruit based on the SSC?

This is a sampling instrument.  The sorting line typically required very high throughput for 100% inspection.  This device is not capable of that.

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