Multiple pressure gradient sensor

Details Multiple pressure gradient sensor Multiple pressure gradient sensor

1998-08-10

2001-03-13

Lobo, Ian J. (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

C367S141000, C073S170330

Reexamination Certificate

active

06201766

ABSTRACT:

I. BACKGROUND OF THE INVENTION
1. Field of Invention
This invention relates to apparatus for studying the relation between hydrodynamic pressure variations in water and fish behavior. More specifically, it relates to apparatus used to study the variations in hydrostatic pressure and particle motion for correlations with fish movement towards and away from, zones of danger to fish, such as the intakes of hydroelectric power generating turbines.
2. Prior Art
Studies in the past of fish behavior were based on simulation of the hydrodynamic pressure variation in the water surrounding a fish, and to this end, plastic models in the shape of a fish were used, as disclosed in U.S. Pat. No. 5,517,465 to the inventors of the present invention.
II. SUMMARY OF THE INVENTION
Many valuable fish species are in serious decline, requiring human intervention to prevent further decline and extinction. Such intervention includes the use of apparatus and methods for diverting or repelling fish away from zones of danger to fish, such as the intakes of hydrolelectric power generating turbines, or the intakes of pumping stations used during off-peak hours for pumping water from the low side of the hydroelectric power dam to the upstream reservoir, for later release through the turbines during peak demand periods, or the intakes of water diversion structures.
The apparatus of this invention is a foil-shaped body having a winged section that ensures minimum obtrusiveness and a predictable water flow pattern around the body shape. The sensory system has piezoelectric sensors mounted on the exterior curved surfaces of the winged section, which is immersed in flowing water, and the output of the sensors is transmittted by cable to equipment for interpreting the sensor output.


REFERENCES:
patent: 3990035 (1976-11-01), Byers
patent: 4328569 (1982-05-01), Trott et al.
patent: 4648082 (1987-03-01), Savit
patent: 5392258 (1995-02-01), Gabrielson et al.
patent: 5517465 (1996-05-01), Nestler et al.
patent: 5657296 (1997-08-01), Carter

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