Maurice Tutor

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About Maurice Tutor

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Expertise:
Algebra,Applied Sciences See all
Algebra,Applied Sciences,Biology,Calculus,Chemistry,Economics,English,Essay writing,Geography,Geology,Health & Medical,Physics,Science Hide all
Teaching Since: May 2017
Last Sign in: 408 Weeks Ago, 1 Day Ago
Questions Answered: 66690
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Education

  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

Experience

  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 03 Jan 2018 My Price 10.00

Radiation detectors

12.28   Estimate the wavelength corresponding to maximum emission from each of the following surfaces: the sun, a tungsten filament at 2500 K,  a  heated  metal  at 1500 K, human skin at 305 K, and a cryogenically cooled metal surface at 60 K. Estimate the fraction of the solar emission that is in the following spectral regions: the ultraviolet, the visible, and the infrared.

12.29   Thermal imagers have radiation detectors that are sen- sitive to a spectral region and provide white-black or color images with shading to indicate relative tempera- ture differences in the scene. The imagers, which have appearances similar to a video camcorder, have numer- ous applications, such as for equipment maintenance to identify overheated motors or electrical transformers and for fire-fighting service to determine the direction of fire spread and to aid search and rescue for victims. The most common operating spectral regions are 3  to 5 µ,m and 8 to 14 µ,m. The selection of a particular region typically depends on the temperature of the scene, although the atmospheric conditions (water vapor, smoke, etc.) may also be important.

(a)    Determine the band emission fractions for each of the spectral regions, 3 to 5 µ,m and 8 to 14 µ,m, for temperatures of 300 and 900 K.

(b)   Using the Tools/Radiation/Band Emission Factor feature within IHT, calculate and plot the band emission factors for each of the spectral regions for the temperature range 300 to 1000 K. Identify the temperatures at which the fractions are a maxi- mum. What conclusions can you draw from this graph concerning the choice of an imager for an application?

(c)    The noise-equivalent temperature (NET) is a specification of the imager that indicates the mini- mum temperature  change  that  can  be  resolved in the image  scene.  Consider  imagers operating at the maximum-fraction temperatures identified in part (b). For each of these conditions, determine the sensitivity (%) required of the radiation detec- tor in order to provide a NET of 5°C. Explain the significance of your results. Note: The sensitivity (% units) can be defined as the difference in the

 

 

band emission fractions for two temperatures dif- fering by the NET, divided by the band emission fraction at one of the temperatures.

Answers

Maurice Tutor
(5)
Status NEW Posted 03 Jan 2018 08:01 PM My Price 10.00

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