Keywords

Photometry



Keyword Definition

Photometry is the measurement of light, which is defined as electromagnetic radiation that is detectable by the human eye. (Palmer, 2003)

It is used within the present hierarchical classification scheme to group together several low-temperature techniques that are dependent on colour measurements within the near-UV (~300nm) to near-IR (~1000nm) (i.e. slightly greater than the range that is detectable by the human eye) wavelengths.

In order to maintain a hierarchical classification, several very important photometric techniques are excluded here.  Instread, they fall under the classification Spectroscopy|Electromagnetic radiation.

Generally speaking, the techniques that are covered here (notably colorimetry and fluorometry) were commonly used in geochemical laboratoeies until the late 1970s, but fell out of favour as multi-element techniques such as AAS and AES were developed.  These newer techniques usually require high temperatures, although there are exceptions (notably Hg CV-AAS).

Reference:

Palmer, J.M. (2003) Radiometry and photometry FAQ (retrieved from http://www.optics.arizona.edu/Palmer/rpfaq/rpfaq.pdf , 16 Sep 2009)



Hierarchical classification

Technique >> Photometry

Children

Colorimetry | Fluorometry | Turbidimetry | Nephelometry | Phosphorimetry


Category: Analytical techniques

The different kinds of analytical techniques have been classified hierarchically. Examples: “AAS”, “FA-NA”. Taken from the “Analytical_Techniques_SHARED” database table.


Associated Analytical Suites:

None


Associated Analytical Packages:

None

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