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# 867f09hw2 - ELEG 867 Devices for Light Detection from the...

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ELEG 867 - Devices for Light Detection from the Submillimeter to the Ultraviolet – Fall 2009 Homework #2 - due Friday, 18 September 2009, in class Photodetector calculations 1. Problem 1.2, from Rieke, p. 28. 2. Problem 1.6, from Rieke, p. 28. (Hint, use the result given in Problem 1.4). 3. Problem 2.2, from Rieke, p. 54. 4. Problem 2.3, from Rieke, p. 54. Homework assignments will appear on the web at: http://www.ece.udel.edu/~kolodzey/courses/eleg867f09.html. Note: On each homework and report submission, please give your name, the due date, assignment number and the course number.

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28 1 Introduction 1.2 Consider a detector with an optical receiver of entrance aperture 2 mm dia- meter, optical transmittance (excluding bandpass filter) of 0.8, and field of view 10 in diameter. This system views a blackbody source of 1000 K with an exit aperture of diameter 1 mm and at a distance of 2 m. The signal out of the blackbody is interrupted by a shutter at a temperature of 300 K. The receiver system is equipped with two bandpass filters, one with AD = 20 ~m and D.A = 1 ~m and the other with AD = 2 11m and D.A = 0.1 11m;both have transmittances of 0.8. The transmittance of the air between the source and receiver is 1 at both wavelengths. Compute the net signal at the detector, that is compute the change in power incident on the detector as the shutter is opened and closed.
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