I would like to measure vibrations in small LHe cryostats. Could anybody recommend commercial sensors which would be suitable for the purpose?
I am interested in the frequency range between 1Hz and a couple of KHz, with particular attention to the low frequency side.
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CSA Archive 
I had very good success in this approximate range using a Hewlett Packard laser vibrometer. This, of course, requires an optical port into your sample volume. What is the anticipated range of motion? And what is the datum for your measurement? And the anticipated power spectral density? Do you anticipate all the power in one or two modes, or it is broader range? Will there be some rotation, or is the expected motion linear?