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Fig.(1) re
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ich is been mator s, the on on
m the at the so on other arget. laser r is to .
Observations and calculation
Distance (cm)
Wood Target (volts)
White Paper Target (volts)
Shining Metal Target (volts) 10 1.27 1.34 2. 15 1.30 1.38 2. 20 1.33 1.64 3. 25 1.58 2.04 4. 30 2.02 2.45 5. 35 1.60 2.06 4. 40 1.35 1.73 3. 45 1.33 1.64 3. 50 1.30 1.56 3. 55 1.28 1.42 2. 60 1.27 1.32 2.
Graphs
Graphs represent the maxima at focal plane
(^110 15 20 25 30 35 40 45 50 55 )
2
3
4
5
Target Distance
Single Voltage
Wood TargetWhite Pape Target Shining Metal target
Results and discussion
This technique is very efficient. All the graphs show the maxima at focal plane irrespective of target matterial. To make it more efficient ,the beam should be prefectly collimated and focous point should lie on photodector. For this purpose beam spliter should be some away from the focus point. Unfotunatly , in the appratus used by us, spliter was at focus point and there was error in the result. We removed this error by making ill collimation and foucusing on photodetector
REFERENCES
Msc theses of Syed Hubby Ali Naqvi Federal Urdu University of Arts, Science & Technology G-7/1, ISLAMABAD.(November, 2009)
