Absolute Radiometry. Electrically Calibrated Thermal by F. Hengstberger

By F. Hengstberger

Absolute Radiometry: Electrically Calibrated Thermal Detectors of Optical Radiation considers the applying of absolute radiometry, a method hired in optical radiation metrology for absolutely the dimension of radiant strength. This publication consists of 8 chapters and starts with the rules of absolutely the size of radiant energy. the next chapters give you the standards linked to reflectance and transmittance of optical radiation and the parameters used to symbolize the functionality of radiation detectors. A bankruptcy provides an research of the temperature distribution in a detector point. This subject is through discussions of the environmental and instrumental corrections in absolute radiometry. the ultimate chapters care for the choice optical strength scales and direct present substitution tools utilized in different fields of metrology.

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Absolute Radiometry. Electrically Calibrated Thermal Detectors of Optical Radiation

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Example text

Finally, the shutter was closed again and the bridge current was increased until the bridge was balanced at the same value of resistance ( # ) . 3 35 Absolute Radiometry Fig. 9 Absolute radiometer. ( K u r l b a u m , 1898) From practical experience, Kurlbaum later concluded that it was easier to produce equal galvanometer signals by radiant and electrical heating rather than to balance the bridge each time. In that case, however, the right-hand part of the Eq. 32 χ 10" W m K " , which is about 6% lower than the best estimate of this constant in 1985 (Quinn and Martin, 1985).

Preston showed that a fixed material standard for the candela was not required if the maximum luminous efficacy of radiation was fixed instead by definition at a wavelength of 555 nm. In that case, it would be possible to calculate the illuminance of any radiation source from the irradiance measured through a filter with a spectral transmittance similar to the spectral luminous efficiency function V(X) of the average human eye, as long as the spectral transmittance of the filter was known. 3 49 Absolute Radiometry would be firmly based on radiometry and photometric units could be derived with radiometric techniques.

The relatively large area had the advantage that it could be measured with greater accuracy. A schematic diagram of Kurlbaum's (1898) absolute radiometer is depicted in Fig. 9. In order to measure an unknown irradiance, Kurlbaum first determined the resistance of his detector element (RJ for a certain bridge current I from the values of the other bridge resistors needed to balance his Wheatstone bridge. Then the detector element was exposed to the radiation to be measured and the bridge was balanced again.

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