Transcript Linearity

Linearity Test
Shahab Khan and Peter Torres
Objective
• A linearity test is performed to determine if
there is a direct response from the cells and
PMT
• To rule out the possibility of light leakage,
light saturation, or any other problems
• By changing the input light incident upon
the cells, we should see a linear output
response
Procedure
• Used discrete pulsed LED with settings:
• f = 100 Hz, Amplitude = {8,10,12,14,16}V
• Observed output current from ammeter as
input amplitude was varied
• Took 500 measurements for each LED input
• Repeated procedure for PMT Voltage 1400,
1500, 1600, 1700
Results
Linearity Test
Current Output, A
1.400000E-06
1.200000E-06
Linear (1700)
1.000000E-06
Linear (1600)
8.000000E-07
Linear (1500)
Linear (1400)
6.000000E-07
4.000000E-07
2.000000E-07
0.000000E+00
5
10
15
LED input, V
20