lec15-2 - line shown, to interface a 100 to 400 W/m 2...

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ECE 117 Instrumentation Electronics Lecture 15. Optical Sensors : Exercises
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A CdS cell has a time constant of 73ms and a dark resistance of 150kohms. A light pulse that is only 20ms in length strikes the cell. If the intensity of the light pulse is such that the final resistance would be 45kohms, plot the resistance versus time for 100ms. What is the resistance at 20ms? At 100ms?
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Design a system using a photodiode, with the VI characteristics and load
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Unformatted text preview: line shown, to interface a 100 to 400 W/m 2 intensity to a computer. The design must use a 10-bit, bipolar ADC (offset binary) with a 5V reference. The design must be such that 100 W/ m 2 produces an output of 100 10 and 400 W/m 2 produces 400 10 . Design a system by which the phototransistor with the curves and load line shown can be used to trigger a comparator when the light intensity rises above 20 W/m 2 ....
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This note was uploaded on 03/22/2012 for the course ECON 1 taught by Professor Tuki during the Spring '12 term at CSU Pueblo.

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lec15-2 - line shown, to interface a 100 to 400 W/m 2...

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