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OCR for page 9
Figure 2 The HICI-FT as described in the text and in Appendix G. The
section labeled top tank is an acrylic water-filled chamber in which the fish
were placed prior to exposure. The HICI-FT is shown in the horizontal
position used during sound exposure.
fish received a pseudorandom presentation of pile
strikes, and every day was different.
HICI-FT Sound Control Operation
Signal generation and data acquisition for the
HICI-FT was controlled using a Dell laptop com-
puter and a 12-bit analog/digital (A/D and D/A)
converter (National Instruments Corporation, Model
PCI-MI0 16E1). Analog drive signals were gener-
ated on two separate channels of the A/D converter.
These were filtered and attenuated using anti-aliasing
filters and programmable attenuators (Tucker-Davis
Technologies [TDT], Alachua, Florida, Model PA4).
The attenuators provided the system with 100 dB of
Figure 3 View inside the HICI-FT chamber (vertical dynamic range beyond the 12-bit resolution of the
position). A Chinook salmon can be seen toward the A/D converter. The attenuators were controlled
bottom of the tube. The long silver cylinder towards the through a serial interface with the PC. The outputs of
bottom of the tube on the left is the light source and the attenuators were amplified by an amplifier (Crown
digital camera. Just above this on the left is the hydro-
phone (black, smaller tube). The wire in the center is for International, Elkhart, Indiana, Model XTi 4000),
an accelerometer (white cylinder attached to the bottom one to each shaker (Vibration Test Systems, VG-150
of the tube). The large black device (lower right) Vibration Generator, Model VTS 150).
measured temperature and total dissolved gas of the water All information regarding each experiment was
in the tube after each experiment. The bottom of the tube recorded on data sheets. An example of the data
is the faceplate for the piston coupled to the lower shaker. sheet is in Appendix C.
9
