depth levels. Or, it may consist of sensor buoys which ride up 

 and down on the taut-wire arrays. It is desirable not to obstruct 

 the range; therefore, moored equipment may not be feasible and 

 some other approach will have to be explored. Data collected 

 at the sensors will be relayed to a data center either by radio 

 telemetry or by cable. At the data center, equipment will be 

 provided both to record the data and to display it graphically for 

 immediate inspection. 



Now what are the environmental properties of interest? I have 

 lumped these into the water properties and the air properties. 

 The properties of interest with their ranges and accuracies are 

 as follows: 



Among properties of the water, we are concerned with: 

 Depth (total ±0.25% full scale); temperature vs. depth (-2° to 

 35° C. ±0. 10° C. ); salinity vs. depth (15 - 40%o ±0. 05%o); 

 current velocity vs. depth (0.05 to 5.0 knots ±0.02 knots and 

 0° _ 360° ±10°); surface waves (0 - 20 ft. ±0.5 ft. and 0° - 360° 



±10°); pressure (0-4, 000 p. s. i. ); density vs. depth (1. 01000- 

 1.07000 ±0.00001); bubbles (to be determined); the optical char- 

 acteristics of the water, including such things as the ambient light 

 vs. depth (absorption - 100% ±1.0%), and the light tr ansmissivity 

 vs. depth (allowable error to be determined); the acoustical 

 characteristics of the water mass: sound velocity vs. depth 

 (4, 500 - 5, 500 ft. /sec. ±0.1 f t . /sec. ), ambient noise vs. depth 

 (0 - 100,000 c.p.s.), acoustic scattering coefficients from 

 the surface and from the bottom (to le determined), and acoustic 

 propagation variability (to be deternnined). 



Air properties in which we are interested are: surface 

 temperature (-10° to 120° F. ±0. 5° F. ); wind velocity (0--125 

 knots ±3 knots and 0° - 360° ±5°); barometric pressure (880 - 

 1,050 millibars ±0. 1 millibar); incident radiation (0 - 40 Langleys/ 

 min. ±5% range); and reflected radiation (0 - 100 USWB scale 

 ±5% range ). 



Do not be dismayed by the length of this list or the ranges 

 and accviracies asked for. We are not asking for a trip to the 

 moon. We are aware that redundancy exists in this list, but we 

 want it. We consider it a desirable feature. The system can be 

 built piecemeal, sensor modules being added as the state of the 

 art develops. The design of the recording system, however. 



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