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Measuring the speed of sound through a material

Hi All,

I have a PXI-1042 chassis with a PXI-6115 multifunction IO card running LabVIEW 7.1.

I have a panel with two piezo transducers attached at known locations.
I need to send a pulse via an analog output through an amplifier to one of the piezos and precisely time when the resulting wave through the material reaches the other piezo with is attached to an analog input.

I have code to generate the pulse for the output piezo and acquire the resulting data from the input piezo, what would be the most accurate way of measuring the time between the output piezo pulse and the resultant input piezo pulse ?

Thanks in advance for any suggestions.

Ewen.
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