Transconductance amplifier for optical metrology applications of light-emitting diodes

Lataa OA-artikkeli, kun julkaistu.Light-emitting diodes (LEDs) have many applications in optical metrology. Depending on the measurement scheme, an LED might be driven, for example, using constant current, amplitude or pulsewidth modulated current, or current pulses. We present the design and characterization of a transconductance amplifier (TCA) optimized to drive LEDs in optical metrology applications. The device is capable of delivering peak and root mean square (rms) currents up to 10 and 1 A, respectively, and has a selectable transconductance ranging from 100 mu text{S} to 10 S. The typical cutoff frequency for the current output is around 10 MHz for various types of LEDs.Peer reviewe

Characterization of a room temperature predictable quantum efficient detector for applications in radiometry and photometry

This paper presents the experimental characterization of predictable quantum efficient detectors, which have been designed for use at room temperature. The aim of the characterization was to validate modelled properties experimentally and, thus, the feasibility of such room temperature predictable quantum efficient detectors to be used as primary radiometric standards for applications in the fields of photometry and radiometry with an aimed uncertainty level of 0.01%. The characterizations were focused on linearity, thermal, angular, spectral and polarization dependencies of the detector that need to be known and considered in the respective applications. The results of the characterization measurements confirm the predictability of the detector, within the aimed 0.01% uncertainty level and, thus, the high potential for using that kind of devices as primary standards for applications in radiometry and photometry.Peer reviewe

Liquid nitrogen cryostat for predictable quantum efficient detectors

We present the design and testing of a cryostat to be used with induced junction photodiodes of the Predictable Quantum Efficient Detector (PQED). Long-term reflectance measurements indicate that possible ice growth on the photodiodes at the temperature of liquid nitrogen (LN) is significantly reduced from earlier PQED cryostat designs.Peer reviewe

Propuesta metodológica de la enseñanza para la resolución de ejercicios de genética mendeliana para los quintos años de secundaria del Municipio de León

Tesis (Lic. en Ciencias de la Educación con Mención en Biología)-Universidad Nacional Autónoma de Nicaragua, LeónUNAN-Leó

Future photometry based on solid-state lighting products

7 pags., 5 figs. -- CIE x046:2019, Proceedings of the 29th CIE SESSION Washington D.C., USA, June 14 – 22, 2019Research project ¿Future photometry based on solid-state lighting products¿ (EMPIR 15SIB07 PhotoLED) has investigated the fundamental requirements for photometry based on white lightemitting diode (LED) sources. The project has developed new LED illuminants, LED standard lamps for luminous intensity and luminous flux, as well as new photometric measurement methods, addressing many technical challenges of the CIE research strategy. In this paper, we present the outcome of the 3-year scientific research project, whose work has been carried out by NMIs, universities, test laboratories and industrial partners working in the field of photometry and solid-state lighting.The work leading to this study is partly funded by the European Metrology Programme for Innovation and Research (EMPIR) Project 15SIB07 PhotoLED “Future Photometry Based on Solid State Lighting Products”. The EMPIR initiative is co-funded by the European Union’s Horizon 2020 research and innovation programme and the EMPIR Participating States. The project would like to thank CIE and the official collaborators NIM, NRC and IPQ for their suppor

Future photometry based on solid-state lighting products

7 pags., 5 figs. -- CIE x046:2019, Proceedings of the 29th CIE SESSION Washington D.C., USA, June 14 – 22, 2019Research project ¿Future photometry based on solid-state lighting products¿ (EMPIR 15SIB07 PhotoLED) has investigated the fundamental requirements for photometry based on white lightemitting diode (LED) sources. The project has developed new LED illuminants, LED standard lamps for luminous intensity and luminous flux, as well as new photometric measurement methods, addressing many technical challenges of the CIE research strategy. In this paper, we present the outcome of the 3-year scientific research project, whose work has been carried out by NMIs, universities, test laboratories and industrial partners working in the field of photometry and solid-state lighting.The work leading to this study is partly funded by the European Metrology Programme for Innovation and Research (EMPIR) Project 15SIB07 PhotoLED “Future Photometry Based on Solid State Lighting Products”. The EMPIR initiative is co-funded by the European Union’s Horizon 2020 research and innovation programme and the EMPIR Participating States. The project would like to thank CIE and the official collaborators NIM, NRC and IPQ for their suppor

Future photometry based on solid-state lighting products

6 pags., 5 figs.Research project “Future photometry based on solid-state lighting products” (EMPIR 15SIB07 PhotoLED) has investigated the fundamental requirements for photometry based on white lightemitting diode (LED) sources. The project has developed new LED illuminants, LED standard lamps for luminous intensity and luminous flux, as well as new photometric measurement methods, addressing many technical challenges of the CIE research strategy. In this paper, we present the outcome of the 3-year scientific research project, whose work has been carried out by NMIs, universities, test laboratories and industrial partners working in the field of photometry and solid-state lighting.The work leading to this study is partly funded by the European Metrology Programme for Innovation and Research (EMPIR) Project 15SIB07 PhotoLED “Future Photometry Based on Solid State Lighting Products”. The EMPIR initiative is co-funded by the European Union’s Horizon 2020 research and innovation programme and the EMPIR Participating States. The project would like to thank CIE and the official collaborators NIM, NRC and IPQ for their support