Quantum Theory

Read e-book online Absolute Radiometry. Electrically Calibrated Thermal PDF

By F. Hengstberger

ISBN-10: 0123408105

ISBN-13: 9780123408105

ISBN-10: 0323157866

ISBN-13: 9780323157865

Absolute Radiometry: Electrically Calibrated Thermal Detectors of Optical Radiation considers the appliance of absolute radiometry, a method hired in optical radiation metrology for absolutely the dimension of radiant energy. This e-book consists of 8 chapters and starts off with the rules of absolutely the dimension of radiant energy. the following chapters give you the standards linked to reflectance and transmittance of optical radiation and the parameters used to represent the functionality of radiation detectors. A bankruptcy offers an research of the temperature distribution in a detector aspect. This subject is by means of discussions of the environmental and instrumental corrections in absolute radiometry. the ultimate chapters care for the choice optical energy scales and direct present substitution tools utilized in different fields of metrology.

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Additional resources for Absolute Radiometry. Electrically Calibrated Thermal Detectors of Optical Radiation

Sample text

That surface was also coated with matt black paint to facilitate the maximum heat transfer by radiation to the thermal radiation detector behind it.

This was soon followed by a further refinement, the introduction of the radiation thermopile by Melloni in 1833. Although it consisted of blocks of bismuth and antimony and thus had a fairly large heat capacity, it proved extremely useful for the type of investigations conducted over the next 50 years because of its superior responsivity. The invention of the bolometer, a sensitive temperature sensor based on the change of electrical resistance with temperature, by Langley in 1880 was a further important milestone.

It was later discovered that the exposed strip in Angstrom pyrheliometers is shaded at the ends by the diaphragm closest to the strip, while the electrically heated strip was heated uniformly over its full length. This "edge-effect" is estimated to have caused measurements to be low by approximately 2% (Drummond, 1970). 001-mm thickness was used as the heater, substrate, and bolometric sensor at the same time. The strip was incorporated in a Wheatstone bridge circuit, with the other three bridge resistors being thick manganin wires.

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Absolute Radiometry. Electrically Calibrated Thermal Detectors of Optical Radiation by F. Hengstberger


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