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M E A S U R I N G   L I G H T (continued)

4. RADIOMETRIC MEASUREMENTS (continued)


4.4 Spectrally Resolved Measurements
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While in paragraphs 4.1 through 4.3 we looked at radiant flux  (Phi)  and at its spatial and angular distributions, we now take a different point of view:
how is radiated energy flux distributed across the various radiation wavelengths?

The subsequent paragraphs 4.4.1 through 4.4.3 deal with
* reasons for using spectral resolution (inevitable in serveral cases of flux measurement),
* instrumentation (not as complicated as you might think),
* applications (very large field of applications is opened).

Flux measurement is the underlying principle of all the distribution and density measurements covered in para. 4.1.2, para. 4.2, and para. 4.3. So, it goes without saying that spectrally resolved measurement of radiant flux  (Phi)  can also be applied to the measurement of
+ radiant energy  Q ,
+ radiant emittance  M ,
+ radiant intensity  I ,
+ radiance  L ,
+ irradiance  E ,
+ and radiant exposure  H .

Continued: 4.4.1 Why Use Spectral Resolution?
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