TO UNDERWATER UNIT j 



SYSTEM GROUND 

 TO SEA WATER 



LOW VOLTAGE 



AC SUPPLY 



LOW PASS 

 FILTER 



TWO CHANNEL 

 DEMULTIPLEXER 



P COUNTER 

 8 DISPLAY 



— LZZ 



TIME BASE I 

 GENERATORl 



I 



CYCLE 

 CONTROLLER 



HIGH PASS 

 FILTER M 



¥ 



T CHANNEL 



T COUNTER 

 8DISPLAY 



zzi — 



INTEGRATOR 



DIGITAL PRINTER, 

 TAPE PUNCH OR 

 MAGNETIC RECORDER 



Fig. 16. 



Block diagram of bathythermograph 

 deck unit . 



3. BROWN, W. L. , Introduction to semiconductor 

 particle detectors, Inst . Radio Eng. , Trans., 

 NS-8, 2, 1961. 



k. DONOVAN, P. F., Nuclear radiation detectors, 

 Control Eng ., 8(9), ikk, September 1961. 



5. MANN, H. M., J. W. HASLETT and G. P. LIETZ, 

 Pulse rise time for charged particles in p-n 

 junctions, Inst . Radio Eng . , Trans., NS-8, 

 151, 1961. 



6. SUGARMAN, R. M. , Nonsaturating transistor cir- 

 cuitry for nanosecond pulses, Inst . Radio Eng . 

 Trans., NS-7, 23, i960. 



7. CHASE, R. L., W. A. HIGINBOTHAM and G. L. 

 MILLER, Amplifiers for use with p-n junction 

 radiation detectors, Inst ■ Radio Eng . , Trans., 

 NS-8, IV7, 1961. 



The data rate capabilities of a system based 

 on nuclear digital transducers will be dependent 

 upon the maximum obtainable pulse rate. If a 

 full scale rate of 10° randomly spaced pulses 

 per second is obtainable, as we anticipate, this 

 would permit one data sample per second with 

 readout accuracy of 0.1$. Longer sampling times 

 would, of course, produce greater readout 

 accuracy. Ultimate mechanical accuracies will 

 be limited by the mechanical sensors chosen. The 

 best available bourdon tubes, for example, have 

 an overall accuracy within a few tenths of one 

 percent . 



CONCLUSIONS 



On the basis of preliminary tests, the unique 

 characteristics of nuclear digital transducers 

 may lead to specialized digital data systems 

 having outstanding long term accuracy. Nuclear 

 digital transducers appear to offer the following 

 advantages : (l) data digitized substantially at 

 the source, (2) long term calibration stability, 

 (3) overall accuracy limited almost entirely by 

 the mechanical sensor, (k) infinite resolution 

 of readout, (5) excellent linearity of readout 

 or alternatively, prescribed nonlinearity for 

 system compensation, (6) automatic averaging of 

 data over the desired sampling time, (7) unaf- 

 fected by temperature and other ambient condi- 

 tions and (8) suitable for rough service 

 applications. 



REFERENCES 



1. KOMPASS, E. J., What about digital trans- 

 ducers?, Control Eng ., 5(7), 9*4-99, July 1958. 



2. KOHL, J., R. D. ZENTNER and H. R. LUKENS, 

 Radioisotope Applications Engineering , 



D. Van Nostrand Company, New York, N. Y., 

 Ih-6-178, 1961. 



181 



