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A thermal imager is used to measure the temperature of a target surface (ε = 1) in the test section of a wind tunnel. The thermal imager must view the target though a window. The temperature of the target varies between 300 and 700 K. We want to be able to determine the target temperature but we know we must correct the camera measurements for the effects of window reflection (ρ = 0.05 - 0.3) of the surrounding room, window transmission, and window emission (i.e. if the target is cold and the window is hot the camera will sense a false high temperature for the target).
The camera has a perfect flat response curve between 3 and 4.5 µm but outside this range it sees nothing. The camera sees the surface through a window made of a material that has a transmissivity of 0.6 - 0.95 in the spectral range of 3-4.5 µm. The window temperature varies between 400 and 800 K. The surroundings are at 300 K. Determine the correction curves that convert the camera indicated target temperature to the true target temperature for the above range of parameters.
Casting : Fe-C alloys with more than 2% carbon are known as cast irons. On crossing the liquidus, proeutectic crystallizes first. On passing by the eutectic temperatures, the liqui
The end of a pipe is inserted into water. A tuning fork is held over the pipe. If the pipe resonates at lengths of 15 cm and 35 cm, what is the frequency of the tuning for
* Question 1 : Sound A has intensity 10 times the threshold if hearing : sound B has intensity 100 times the threshold of haring . How much louder do we perceive sound B ? * Ques
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When a system returns back to its initial state after passing by dissimilar phase, the phenomena is said to be a cyclic process. In this process as ΔU = 0. From first law of the
Explain the formula of the Stefan law. STEFAN'S LAW: P = σ AT 4 Here: P = Power radiated into W (J/s) σ = Stefan's Constant 5.67 x 10 -8 W m -2 K -4 A = Su
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The molecules of diatomic and linear polyatomic gases are made up of two atoms joined rigidly to one another by a bond. Such a particle cannot only move as a entire but can also ro
What are multistranded fibers? Multistranded optics is narrow walled tubes of transparent material that housing a number of smaller solid core fibers. These inner fibers are, u
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