Section F
Having proved his point, Dr Liu is now trying to design sensors that work more like the sense cells in a real lateral line. Instead of heated filaments, these sensors have artificial hairs. The hairs flutter in moving water as flags do in moving air, and the way in which they flutter contains information about the direction and speed of the water moving past them. This principle should allow the team to build more sensitive arrays. Heating filaments in water causes bubbles to form, so turning the power up too much stops them working. Hair sensors do not suffer from the same upper limit.
Section G
Artificial lateral lines would have many applications. The most obvious would be in submarines, both manned and unmanned. In the case of military submarines they would have the advantage over sonar of being passive. Sending out a ping is a dead giveawayliterally so, in time of war. And merely listening for sound cannot detect stationary threats. A lateral-line system could. The vortices thrown off by water moving past even a stationary object would be visible to it.
Dr Liu also speculates about using lateral lines to detect air-movements. That could lead to some far less obvious applications, such as a lateral line-enabled iPod that automatically pumps up the volume in response to the onrushing air of an underground train or similar big, noisy object. That would, indeed, be an inventive brush with nature.
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2016-02-26
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