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Using ultrasonic waves it is easy, because both sound speed and attenuation are changing strongly, depending on the hardness (ripeness) but to achieve proper results some additional measurements must be made. They can be also made with ultrasound. This means: to achieve the goal, you must build...
The best way to couple ultrasound is to use immersion in water.
Ripeness changes the speed of sound, but also the attenuation. It is not sufficient to check only one way, but a kind of picture (cross section) would be necessary.
The necessary device will be not very simple, but quite effective...
Re: ultrasonic pic
You will not get the frequency change, but you can measure velocity change. But I would assume, that this will be not large and you will need the device, that can measure it with high precision.
If you want, I can help. I find the idea could be interesting, but only in the...
It is possible to develop such system, based on transmission of ultrasonic waves through fruit. We have collected some experience with this topic and would be able to develop such equipment.
If you are interested, please contact me.
W. Bicz
link removed
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