52 INSTRUMENTATION IN SCIENTIFIC RESEARCH [Chap. 1 



H' 



¥a 



coo 



OOO 

 C,.;,,': 



OOO 

 OOO 

 OOO 



H 



c 



rf 

 generotor 



-CD- 



-Q 



Eo 



Fig. (1-2)32. Single-coil eddy- 

 current displacement transducer, 

 schematic diagram. 



n- id -? 



OOO 

 OOO 



OOO 



OOO 



-/>' 



-<?rf+6- 



-tf + 6- 



T 



oooo 

 oooo 

 OOOi 



s-*~ 



oooo 

 oooo 

 oooo 



o o o 



OOO 

 OOO 



OOO 

 O C O 



ooc 



T 



5> 



-2{d+b)- 



rf 



Eo 



-* 1 "-(EH 



Fig. (1-2)33. Eddy-current displace- 

 ment transducer with two coils, sche- 

 matic diagram. 







100 200 300 400 500 600 700 800 900 

 Displacement X, mils 



Fig. (1-2)34. Transfer characteristic of an eddy-current 

 transducer [figures (1-2)34 to (1-2)36 from H. M. Joseph 

 and P. Newman, Trans. AIEE, 74 (I), 39 {March, 1955); 

 by permission]. 



