Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 02 Jan 2018 My Price 8.00

thermistor detector

Repeat Prob. 12.1 for distances of 6 and 12 ft between the source and detector.

Prob. 12.1

Consider the thermistor detector and radiation source of Example 12.1. Instead of the bare detector, an optical system collects the radiation over a circular area of radius r and focuses it on the detector, which is maintained at 20â—¦C. Plot the source temperature necessary to maintain a signal-to-noise (S/N) ratio of 200 as a function of the radius of the collecting optical system. Assume that the distance between the source and detector is 1.0 m, as in Example 12.1. Neglect losses in the optical system for this calculation.

Example 12.1

A certain thermistor-radiation-bolometer detector has characteristics such that the minimum input power necessary to produce a signal-to-noise (S/N) ratio of unity is 10−8 W. Suppose such a detector is located 1.0 m from a blackbody radiation source and is perfectly black. Calculate the temperature of the source necessary to produce an S/N ratio of 10, assuming that the detector and surroundings are maintained at 20◦C. The source is a black sphere, 5.0 cm in diameter, and the detector area is 1 mm2.

 

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Maurice Tutor
(5)
Status NEW Posted 02 Jan 2018 10:01 PM My Price 8.00

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