jeudi 11 août 2011

Stimulation acoustique des cellules ciliées





Durée d'acquisition : 1 ms ( 0,001 seconde )
Nombre de points : 101
Cette impulsion se répète toutes les 20 ms environ , soit 50 fois par seconde
( l'impulsion a une fréquence de 50 Hz environ )
La pression varie entre 107444 et 107460 Pa , elle est nettement plus élevée que la pression atmosphérique qui est normalement de 101325 Pa , soit une différence de 6120 Pa environ .
La différence de pression est due à la pression acoustique instantanée d'un dispositif acousto-optique pulsé et dirigé , c'est à dire d'ultrasons . Les variations de pression montrent la modulation d'amplitude des ultrasons .   

      t                               pression L
      s                                   Pa

 0,0000000 107460,0000000
 0,0000100 107454,8437500
 0,0000200 107452,8515625
 0,0000300 107448,2578125
 0,0000400 107452,6875000
 0,0000500 107460,7421875
 0,0000600 107456,7343750
 0,0000700 107457,8046875
 0,0000800 107457,6875000
 0,0000900 107454,3906250
 0,0001000 107453,4140625
 0,0001100 107446,7500000
 0,0001200 107447,8984375
 0,0001300 107450,0078125
 0,0001400 107452,2187500
 0,0001500 107455,3906250
 0,0001600 107452,1875000
 0,0001700 107450,0156250
 0,0001800 107447,9140625
 0,0001900 107446,7265625
 0,0002000 107453,2031250
 0,0002100 107452,1015625
 0,0002200 107450,1171875
 0,0002300 107450,1015625
 0,0002400 107452,1953125
 0,0002500 107455,4453125
 0,0002600 107452,1640625
 0,0002700 107449,9765625
 0,0002800 107447,9140625
 0,0002900 107446,8203125
 0,0003000 107453,1718750
 0,0003100 107452,1015625
 0,0003200 107450,1015625
 0,0003300 107450,0000000
 0,0003400 107450,0000000
 0,0003500 107449,9843750
 0,0003600 107450,2031250
 0,0003700 107454,2968750
 0,0003800 107458,6484375
 0,0003900 107451,1328125
 0,0004000 107451,2109375
 0,0004100 107446,7343750
 0,0004200 107450,0781250
 0,0004300 107455,4375000
 0,0004400 107454,2890625
 0,0004500 107453,1718750
 0,0004600 107444,8437500
 0,0004700 107446,9375000
 0,0004800 107458,6093750
 0,0004900 107456,4531250
 0,0005000 107455,5859375
 0,0005100 107450,1953125
 0,0005200 107449,0781250
 0,0005300 107458,6562500
 0,0005400 107456,5312500
 0,0005500 107455,4921875
 0,0005600 107450,0859375
 0,0005700 107446,8437500
 0,0005800 107453,3359375
 0,0005900 107452,1796875
 0,0006000 107452,2890625
 0,0006100 107455,3750000
 0,0006200 107452,2187500
 0,0006300 107450,2031250
 0,0006400 107452,2968750
 0,0006500 107457,6328125
 0,0006600 107457,7500000
 0,0006700 107454,4531250
 0,0006800 107455,5000000
 0,0006900 107452,3203125
 0,0007000 107452,2031250
 0,0007100 107453,2812500
 0,0007200 107448,8906250
 0,0007300 107451,1718750
 0,0007400 107446,6718750
 0,0007500 107450,0703125
 0,0007600 107455,4062500
 0,0007700 107454,4218750
 0,0007800 107455,3671875
 0,0007900 107450,1015625
 0,0008000 107446,9062500
 0,0008100 107453,2656250
 0,0008200 107452,0859375
 0,0008300 107449,9765625
 0,0008400 107447,9062500
 0,0008500 107446,9296875
 0,0008600 107455,3750000
 0,0008700 107457,5859375
 0,0008800 107454,3984375
 0,0008900 107453,4453125
 0,0009000 107448,8281250
 0,0009100 107453,3359375
 0,0009200 107452,2109375
 0,0009300 107452,3125000
 0,0009400 107455,4765625
 0,0009500 107454,2578125
 0,0009600 107452,6484375
 0,0009700 107447,4687500
 0,0009800 107448,1796875
 0,0009900 107449,6953125
 0,0010000 107450,0000000    

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