By Palmer, James M.; Grant, Barbara G.
This article covers subject matters in radiation propagation, radiometric assets, optical fabrics, detectors of optical radiation, radiometric measurements, and calibration. Radiometry kinds the sensible foundation of many present functions in aerospace engineering, infrared structures engineering, distant sensing platforms, monitors, noticeable and ultraviolet sensors, infrared detectors of optical radiation, and lots of different parts. whereas a number of texts separately hide themes in particular components, this article brings the underlying ideas jointly in a fashion appropriate for either school room instructing and a reference quantity that the practising engineer can use.
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That the mirror reflects 100% of the incident radiation), that all power collected by the mirror is relayed to the detector, and that 10–6 W are incident on the detector, we can determine the irradiance at the detector. We can then use detector irradiance to calculate the star’s intensity. As seen in Fig. 34, the system is f/2 with a focal length of 1 m. 5 m. The area of the mirror (assumed circular) is πD2/4. The irradiance on this (perfectly reflecting) mirror is Em = Φ m 4 × 10−6 = = 5 × 10−6 W/m 2 .
87) Note that this expression does not take into account the spectral nature of the radiation, to be discussed in greater detail in Chapter 4, nor does it account for the transmission of the atmosphere.
Radiant intensity is frequently used when describing the radiation of an isotropic (same in all directions) point source. Its symbol is I and its units are W/sr. 20 conceptually illustrates the radiant intensity of a point source and a surface illuminated by it. 36) defines radiant intensity mathematically: § ∆Φ I = lim ¨ ∆ωs → 0 ∆ω s © · dΦ . 37) A and radiant power can be derived from intensity by integrating over solid angle ω. ) Φ = ³ Id ω . 38) ω In the case of the isotropic point source, the radiant power is 4π times the intensity.
Art of Radiometry by Palmer, James M.; Grant, Barbara G.