The main goal of the JRP is an improved silicon detector primary standard for radiometry having approximately the same cost and functionality as present transfer standard detectors enabling the primary standard to be built into different applications taking full advantage of properties of Predictable Quantum Efficient Detectors (PQEDs) developed in an earlier EMRP project.
Work-package 1 (WP1) will develop primary standards for absolute radiometry at 1 ppm uncertainty in the visible wavelength range by realising a cryogenic temperature (CT) PQED, while at room temperature (RT) PQED responsivity will be determined within 100 ppm uncertainty. This will be achieved through thorough characterisations and advanced modelling.
Work-package 2 (WP2) will validate the claimed ultra-low uncertainty of CT-PQEDs by best possible measurements (10 ppm nominally) with the improved existing primary standard (the so-called cryogenic radiometer, based on the electrical substitution principle) and by direct comparison of several PQEDs. The direct comparison is sensitive at the ppm level to deviations of the PQEDs with each other. Eventually, a radiometric measurement of the ratio of the fundamental constants e and h (e/h) will be obtained.
Work-package 3 (WP3) will implement the RT-PQEDs for applications at 100 ppm uncertainty as spectral responsivity standards. Positive outcome will lead to the realization of a primary standard for radiometry operating at room temperature and having approximately the same cost and functionality as present transfer standard detectors.
Work-package 4 (WP4) will implement the RT-PQED as a primary standard in applications for industries and NMIs interested in a better and easier traceability to radiometric standards, that is, by investigating the applicability of RT-PQEDs as
- The primary radiometric standard for the determination of the luminous responsivity of a reference photometer by direct comparison to a RT-PQED equipped with a precision aperture to achieve irradiance mode operation. This will enable the realisation and transfer of photometric units with uncertainties better than the state of the art as compared to conventional traceability chains (uncertainty ≈ 1000 ppm);
- A primary radiometric standard for the direct, one step determination of the spectral irradiance responsivity of filter radiometers widely applied for the determination of thermodynamic temperatures of blackbodies and most promising candidates for the future Mise-en-pratique of the Kelvin (MeP-K);
- A primary radiometric standard for fibre optic power meter, for 850 nm wavelength, as driven by the interest of the fibre optics industry in a better and easier traceability chain for fibre optics calibrations
Work-package 5 (WP5) will check the suitability of RT-PQED as travelling artefacts for comparisons, in terms of robustness and stability over time.
Work-package 6 (WP6) is to maximise the impact for the JRP, to ensure that the results achieved by the project are adequately and appropriately communicated to the stakeholders and end-user community and that input and feedback is obtained from this community. It sets a framework for the exploitation of the results of this project to the benefit of end-users and beyond.