| Zugriffsnummer | 18344 |
| Dokumenttyp | Buchartikel |
| Sprache | Englisch |
| Titel | Definition and measurement of radiometric quantities |
| Autor(in); Institution |
Wende, Burkhard; PTB-Berlin, retired staff
Fischer, Joachim; 7.4, Temperatur, PTB-Berlin
|
| Quelle/Jahr | Numerical data and functional relationships in science and technology. Landolt Börnstein. Group 8, Vol. 1, Subvol. A, Part 1:(2005), 45 - 51 |
| Herausgeber(in) |
Weber, Horst
|
| ISBN | 3-540-44379-7 |
| Verlag | Berlin [u.a.]: Springer |
| Zusammenfassung | The definition and measurement of radiometric quantities important in the field of op-tical radiometry, which covers the measurement of electromagnetic radiation in the wavelength range from about 0.01 µm to 1000 µm are described. The corresponding photometric quantities on the other hand involve the additional evaluation of the radiant energy in terms of a defined weighting function, usually the standard photometric observer. In the article only the definition of the radiometric quantities are explained in detail. Starting from the radiant energy the other fundamental radiometric quantities radiant power, radiant excitance, irradiance, radiant intensity, and radiance are derived by considering the additional physical quantities time, area, and solid angle. The radiometric quantities defined in abstract terms are practically embodied by radiometric standards. Radiometry is based on primary detector standards and primary source standards. Primary detector standards are mostly electrical substitution thermal detectors whereas for primary source standards the emitted radiant power is accurately calculable. For the radiometric measurement of cw laser emission radiation detectors or radiometers calibrated against primary detector standards are the preferred secondary standards. The detection principle of the radiometers could be thermal (thermopiles, bolometers, and pyroelectric detectors) or photoelectric (semiconductors). As secondary standards for pulsed laser radiation mostly thermally absorbing glass-disk calorimeters are used. These standards are derived from the cw standards using accurately measured shuttering of the laser radiation to produce pulses of known radiant energy. |
Zitierung
Wende, B. & Fischer, J. (2005). Definition and measurement of radiometric quantities. In H. Weber (Ed.), Numerical data and functional relationships in science and technology. Landolt Börnstein. Group 8, Vol. 1, Subvol. A, Part 1 (pp. 45–51). Berlin [u.a.]: Springer.