wave height and roll angle data primarily when the submarine is 

 hovering. The variables to be recorded are (1) wave height and (2) 

 roll. The repetition rate is less than 0.6 second. 



C. DESCRIPTION OF SYSTEM 



1. System components 



The system consists of sensors for measuring the appropriate 

 variables, digitizing components to convert sensor outputs to digital 

 form where required, displays for all recorded information, a scanner 

 to feed the information alternately from each sensor to the recorder 

 or tape punch, a digital recorder for optional use in lieu of the tape 

 punch, a tape punch to make a permenent record of the recorded vari- 

 ables and allow a direct input to the Hydrographic Office digital comput- 

 er (Burroughs 205), and a Flexowriter to annotate the punched tape 

 further, as necessary, and to play back the punched data in the field 

 for its verification. The proposed oceanographic console is shown in 

 Figure C-4. 



2. Sensors 



With the exception of the clock, calendar, and manual inputs, 

 all sensors are mounted in a single transducer housing as shown in 

 Figure C-5. This housing requires a single foundation and may be 

 mounted either on the deck or atop the sail. A single multiconductor 

 cable from the transducer housing to the recorder console requires 

 only one pressure hull penetration. All other inputs, such as time, 

 date, position, etc., originate in the oceanographic console itself. 



Pressure (depth) is sensed by a vibrating wire transducer in the 

 sensor housing. Its output is a frequency which is inversely propor- 

 tional to depth. This instrument has undergone repeated tests aboard 

 the USS REDFIN without a single failure. 



Sound velocity is obtained from a Bureau of Standards velocimeter 

 located in the sensor housing. This instrument was found to be quite 

 reliable during shipboard operations. The output of this transducer is 

 a frequency which is directly proportional to sound velocity in feet per 

 second. 



The temperature probe consists of dual thermister elements. The 

 output of the bridge is a voltage which is directly proportional to 

 temperature. The thermister s have been tested both in the laboratory and 

 aboard the USS REDFIN and yield accuracies of about ±0.1°C. 



C-3 



