VOLTAGE 

 THRESHOLD 



tn^t 



Figure 16. Detection threshold effects on transit time 

 measurement . 



sar 



48- 



\j 



L 

 



L 

 L 



hi 



20- 



10" 



J 1 I i i I I i I i I 



6 12 (8 24 



Path Length Cinches!) 



Figure 17. Half-wavelength detection error. 



45 



