Radiometric reference for weak radiations: comparison of methods

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Title: Radiometric reference for weak radiations: comparison of methods
Author(s): Ghazi-Bellouati, A.; Razet, A.; Bastie, J.; Himbert, M. E.; Degiovanni, I. P.; Castelletto, S.; Rastello, M. L.
Abstract: The parametric down conversion of photons generated in a non-linear crystal gives rise to two correlated photons. When associated with a system of coincidence counting, this phenomenon allows one to measure the quantum efficiencies of detectors working at a normal rate of photon counting, without the need for reference sources or detectors. At the Institut National de Métrologie (INM) (France), this method was implemented with the aim of developing a new standard detector for the absolute measurement of very weak radiation. The validation of this method is presented from an international comparison between the laboratories of the INM (France) and the Istituto Elettrotecnico Nazionale Galileo Ferraris (IENGF) (Italy) and from a comparison of methods at INM using the French national standard detector, the cryogenic radiometer.
Publication type: Journal article
Source: Metrologia, Vol. 42, no. 4 (Aug 2005), pp. 271-277
Publication year: 2005
FOR Code(s): 0299 Other Physical Sciences
Keyword(s): Calibration; Cryogenic radiometers; Crystals; Laser beams; Laser pumping; Measurement theory; Nonlinear crystals; Optical fibres; Phase matching; Photocurrents; Photographic films; Photons; Planck's constant; Quantum efficiency; Radiometers; Radiometry
Publisher: Institute of Physics Publishing
ISSN: 0026-1394
Publisher URL: http://dx.doi.org/10.1088/0026-1394/42/4/012
Peer reviewed