2

, , (), (1)CH102008037383, 2008037377, 2008037371, 2008037359,

. , .

( ) .

, .

.

.

1887167818011672 187319001905

.

. . . . . . (): , , . , ? ? . , ,

10km

ABC

(Time of flight)

. (law of reflection) ..

. . , . . (external reflection) (internal reflection)== - == -

(retroreflection) . (:) , () . .

, . .

, .

, . , . .

(index of refraction) n

, .

, :

.

70% 95%. 100% .

100%

1) 20.1 . , , . (2MHz, 12Vpp ) , +6V 5[nsec] . . .

Optical Path Length Lch1EXT Trigger InputFunction Generator (Pulse Driver, Square Wave, 2MHz, 15Vpp)Optical Pulse Generator w. Magnetic MountTrigger OutputMain OutputPhoto-detectorSteel Plate for Magnetic Base MountingDC Power Supply(+6V)BNC T-adaptor and 50 ohm TerminatorPulse Time Delay tdReference Pulse: Reference Time(A position)(A position)Delayed Pulse(B position)3m Coaxial CableOscilloscope (10nsec/div, 10mV/div, EXT Trigger)

td . L . 3m CH1 . (BNC T-adaptor 50 ) .( ) (TRIG. INP.) EXT .

2) (A position) . 1~50mv/div, 10~100nsec/div . 10nsec/div 10 (x10) . , . . 1m (B position) , (1m ) td . 1m 3m .

3) 2) , . Logger Pro 3 L[m], td[sec] . . 1/c*x c . c = 3X108[m/sec] .4) ( ) ?

5) v . 1)~2) 1m td, . 1m . 1m ( ) . . ? .6) v . 1)~2) 1m td, . 1m . . ? .

7) 10 B. ( ) . 2 .

1) 10.3 . 10.4 . LD , , D ( ) ( ) . , D , D . ()-->() , .

D-LensLaser Diode Light SourceScreen(a) Rotational TableOptical Rail

(b) D-LensLaser Diode Light SourceScreenRotational TableOptical Rail

2) LD , . . D D . , 1 0 r 0 LD D . . 0, 0 2 . .

3) D 10 , . 10 80 . 10.1 . D 10 , . 10 80 . 10.1 .4) n2 .

1) 10.5 . LD, , D ( ) ( ) . , D , D . ()-->() .

D-LensLaser Diode Light SourceRotational TableOptical RailScreen

2) LD , . . D D . , 1 0 r 0 LD D . . 0, 0 2 . .

3) D 10 , . 10 40 . 10.2 . D 10 , . 10 40 . 40 50 90 , .

*