Somebody posted this on rec.music.makers.guitar.jazz

It obviously belongs in this NG. Talk about low frequency response:

On 23 May 2006 20:45:54 -0700, wrote:

A new FBG device for dynamic monitoring

TRICOM has completed Fiber Bragg Grating Dynamic Interrogator FBG-3000.
It is the most advance high speed Interrogator for Fiber Bragg Grating
sensing, the only available Interrogator scan 8 channels at 320 Hz
simultaneously. With its Dual-core Power PC and high speed digital filtering
technologies, guarantees high resolution of 1 pm and repeatability of 2 pm.

Applications:
--risk and damage assessment for civil construction, bridges, road, and
dams
in earthquake zone;
--down-hole and deep-sea oil platform riser monitoring;
--dynamic WIM on railway and highway.