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# ET 372 Assignment: Week 5 Assignment - Optical Sensors

Question # 00449424
Subject: Engineering
Due on: 12/30/2016
Posted On: 12/26/2016 03:55 AM

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Work the problems below. To receive any credit, you must show all work. You may submit your work in a word processing document or in a pdf file. Graphic files are not acceptable submissions. Your file submission document should be entitled Week5AYourGID (replace YourGID with your specific GID).

1. A source of green light has a frequency of 6.2 x 1014 Hz. What is the wavelength in nanometers (nm) and in ?

2. A flashlight beam has an exit power of 100mW, an exit diameter of 3.8cm, and a divergence of 1.1. Calculate the intensity in mW/cm2 at 55m and the size of the beam at that distance.

3. Suppose a 680-nm beam with a power of 0.2 mW and a 4.5-cm diameter strikes a detector with a 0.2-cm diameter. How many photons strike the detector per second?

4. A photomultiplier has a current gain of 3 x 106. A weak light beam produces 55 electrons/s at the photocathode. What anode-to-ground resistance must be used to get a 2.8 V voltage from the light pulse? The charge of an electron is 1.6 x 10-19 coulomb.

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#### ET 372 Assignment: Week 5 Assignment - Optical Sensors (Tutorial Guide)

Tutorial # 00445210
Posted On: 12/26/2016 03:56 AM
Posted By:
schoolbench
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optical_sensors_physics.docx (14.03 KB)
Preview:  (6 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx = x 92*10^-19 JouleArea x ?*(d/2)2 =3 xxxxx 5/2)*(4 xxxx x 15 x cm^2Power = x 2mW = xxxxxxxxxxxx (W) x xxxxxx of xxxxxxx per second x energy per xxxxxx  So xx xxx , xxxxxx of photon xxx second = xxxxxxxxxxxx per xxxxxx x 200watt/2 xxxxxxxxx jouleNumber of xxxxxxx = 6 xxxxxxxx photons4 x xxxxxxxxxxxxxxx has x current gain xx 3 x xxx A xxxx xxxxx beam xxxxxxxx 55 electrons/s xx the photocathode xxxx anode-to-ground xxxxxxxxxx xxxx be xxxx to get x 2 8 x voltage xxxx xxx light xxxxxx The charge xx an electron xx 1 x x 10-19 coulomb xxxxxxxxxxxxxxxx of electrons.....
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