hw03

# hw03 - EE 4770 Homework 3 Due: 8 March 1999 Problem 1: The...

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EE 4770 Homework 3 Due: 8 March 1999 Problem 1: The distance from a light source of unknown but steady brightness is to be determined using a photodetector mounted on one end of a 250mm rotating arm (with the rotation around the other end) as illustrated below. light distance 250 mm light arm photodetector The light source radiates uniformly in all directions; the photodetector is sensitive to irradiance and is equally sensitive to light in all directions and is sensitive to no other light sources. The light source will be outside the circle traced by the rotating photodetector. The photodetector is connected to a conditioning circuit (already designed) which feeds an 18-bit ADC. The ADC output is interfaced to a computer. The photodetector and conditioning circuit are linear; the ADC saturates at 10 mW cm 2 . The ADC is noisy, so its output randomly varies by ± 1. The arm makes one complete rotation in exactly 10 seconds. A proximity sensor detects when the arm is at its 0 angle, at which point a 16-bit counter is reset. The counter is clocked at

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## This note was uploaded on 11/28/2011 for the course EE 4770 taught by Professor Staff during the Fall '99 term at LSU.

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hw03 - EE 4770 Homework 3 Due: 8 March 1999 Problem 1: The...

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