Abstract
References
1.Hewlett Packard Optoelectronics Application Manual , McGraw Hill , 1989 .
2.
Usher
M.J.
, Sensors and Transducers , p.167 , Edward Arnold , 1996 .
3.
de Sa
, Principles of Electronic Instrumentation , p.201 , Edward Arnold , 1981 .
4.ibid . p.200 .
5.
Jayawant
BV
, Electromagnetic Suspension and Levitation Techniques , p.100 , Edward Arnold , 1981 .