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How often can a passive RFID be polled?

I need to measure vibration using RFID, or some other technology. (Feel free to say if there is a better choice that RFID passive)

I need very low cost per chip and very low profile, hence RFID passive. Also, I can not justify the difficulty of batteries needed to be replaced.

Given that the "energy" comes from the message received, how often can a passive RFID be polled? I expect these vibrations to be short lived, and therefore, easily missed.

Is it crazy to poll the chip every second? Or every half second?

It sounds crazy to me, but this may be the only way I can create a solution cheap enough and useful.

Thanks
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viki2000
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We need to know at which RFID tag do you refer exactly.
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Well, I have not chosen a chip and was asking a general question. How about this one?

What is the most often a passive RFID chip can be polled? And is it possible to poll hundreds of them in a small area with the same frequency?

If so, which chip can do this?
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>  If you have vibrations moving a tag a couple of mm the tag may only ever be read once.

I am not sure I understand.

My needs are a very low cost and low profile tag I can attach to a widget. I do not care if it's RFID or some other technology. I need to get able to get vibrations from that chip.

What do you suggest?
Thanks, I need to learn much more about:

vibration sensors piezoelectric