Wyniki wyszukiwania - BazTech

1

Radiometric calibration and measurement algorithm for electrical inspection solar-blind ultraviolet cameras

Coetzer Casper J., West Nicholas

Opto-Electronics Review

|

2022

|

Vol. 30, No. 1

art. no. e140128

EN

Solar-blind ultraviolet cameras with image intensifier with CMOS detector typically use various count methodologies to measure the optical energy of an electrical corona. However, these count methodologies are non-radiometric without considering parameters such as distance, focus-, zoom-, and gain setting of a camera. An algorithm which considers the calibration and radiometric measurement of optical energy for the slow frame rate intensifier type cameras is presented. Furthermore, it is shown how these calibration data together with the flowcharts are used for the conversion from raw measured data to radiometric energy values.

2

Method to determine solar-blind ultraviolet energy and electrical corona loss relation

Coetzer Casper J., Myburgh Hermanus C., West Nicolas, Walker Jerry

Opto-Electronics Review

|

2022

|

Vol. 30, No. 4

art. no. e143433

EN

Solar-blind ultraviolet cameras as part of high-voltage electrical inspections until recently have mostly been used for pure observations. These observations only imply the presence of corona discharges and not the severity thereof. A radiometric algorithm together with a calibration algorithm to perform an optical energy measurement were presented earlier. This is a guide on how to apply the algorithm to determine the total optical measurement from corona discharges, plus additional processing. This guide and additions are used to compare the electrical and optical domains with actual examples. The main objective is to illustrate how to determine the electrical and optical relation for the IEC 60720 high-voltage electrical test configurations using a standard open procedure.

3

Praktyczne aspekty niedopasowania zakresów spektralnych sond pomiarowych do obowiązujących kryteriów oceny zagrożenia nielaserowym promieniowaniem optycznym

Pawlak A., Wolska A.

Prace Instytutu Elektrotechniki

|

2015

|

Z. 268

122--140

PL

W artykule przedstawiono przykłady niedopasowania widmowego metody radiometrycznej stosowanej do wyznaczania poziomów ekspozycji na stanowiskach pracy zgodnie z obowiązującymi kryteriami oceny zagrożenia promieniowaniem optycznym w środowisku pracy. Na przykładzie badań porównawczych wykonanych spektroradiometrem OL 750 oraz radiometrem ILT 1400 z zestawem sond pomiarowych dedykowanych wybranym zagrożeniom promieniowaniem optycznym, przeanalizowano potencjalne różnice wskazań wynikające z niedopasowania widmowego stosowanych sond pomiarowych. Wykazano, że niedopasowanie widmowe sond pomiarowych przy wyznaczaniu poziomu ekspozycji dla zagrożenia fotochemicznego oczu i skóry promieniowaniem UV oraz termicznego siatkówki oka promieniowaniem VIS + IR-A w nieznacznym stopniu wpływa na wynik pomiaru. Natomiast w przypadku wyznaczania poziomu ekspozycji na promieniowanie UV-A stwierdzono niedoszacowanie wyników pomiaru wynoszące ok. 30%, które należałoby uwzględniać przy wyznaczaniu poziomu ekspozycji oczu na promieniowanie UV-A.

EN

The article presents examples of spectral unfitting of a radiometric measurement method, which is used for determining of the exposure level on workstations according to obligatory criteria of the occupational hazard evaluation arising from an optical radiation. The comparative measurements were carried out using spectroradiometric and radiometric methods and the potential percentage differences of measurement results were obtained. The spectral unfitting of detectors used for actinic UV measurements and thermal retina hazard form range VIS+IR-A showed small difference of measured exposure levels had small influence on hazard evaluation. However, the spectral unfitting of UV-A irradiance resulted in 30% underestimation of the radiometric method which underestimation should be taken into account during the exposure level determination.

4

Ewolucja systemu hydrograficznego i szaty roślinnej dorzecza górnej Piławy i górnej Drawy (Pomorze Środkowe)

Lewandowski J., Nita M.

Przegląd Geologiczny

|

2008

|

Vol. 56, nr 5

380-380

EN

Highly varied hydrographic system occurs in the drainage basins of the upper Piława, Płytnica and Drawa Rivers (Middle Pomerania). Numerous radiometric dating carried out by the methods of 14C, OSL and U/Th, as well as pollen analyses and geomorphological analysis enable to study evolution of the system in the period of the last twelve thousand years. Glaciolacustrine deposits, accompanying most of the lakes, represent accumulation, which took place at the initial stage of the lacustrine basin formation. The level of lacustrine waters fell by several to more than a twelve meters in that time and was controlled by melt water runoff channeled through valleys in the southern direction. The final stage of the lake development was connected with complete melting of buried dead-ice masses and formation — bottoms of lake. Evolution from glaciolacustrine to lacustrine basins within kettles was continuous process. Lake water level started to fall abruptly when the last remnants of the dead ice blocking the runoff have melted and the inter-lake channels have been erosionaly deepened. That phase should be related to the complete decay of permafrost, probably at the end of the Allerřd. The main phase of erosion in the gorges started at the end of the Pleistocene and lasted (with lower intensity) till the Pre-Boreal and/or the Boreal. The water level in the lake system drained by the Piława and the Drawa Rivers was finally fallen by 8–16 meters and for a long time was stabilized (during the Atlantic and Sub-Atlantic) at the level of 2 meters higher than the present one. Further lowering of drained lakes by the next 2 meters was probably caused by anthropogenic activities resulting from intensive colonization in the 16th and 17th centuries and later by land improvement accomplished in the drainage basins of the Drawa and the Piława Rivers in the 19th century. Local conditions strongly influenced character of forest communities in the area investigated. The tendency was especially significant in the Atlantic. Increased importance of pine trees in the vicinity of the Lędyczek site caused that broadleaf forests with oak, maple, lime and hazel trees, typical of the Atlantic, have not developed there.

5

Pomiary dozymetryczne do oceny skażenia radioaktywnego w dydaktyce z zasosowaniem modelowania elektronicznego

Dimov V., Manukova A., Levi A.

Prace Przemysłowego Instytutu Elektroniki

|

2006

|

nr 153

215-222

PL

W referacie jest opisana zasada działania proekologicznego modelu elektronicznego, za pomocą którego bez użycia źródeł promieniowania jonizującego można symulować pomiary beta, gamma lub beta+gamma promieniowania. Taka symulacja pozwala wykonać ilościową i jakościową ocenę skażenia radioaktywnego. Przedstawione są schemat blokowy, schemat elektryczny i przykładowe wyniki pomiarów wykonanych symulacji. Omówiona zasada działania opisanego proekologicznego modelu może być zastosowana w dydaktyce i do innych zajęć praktycznych w zakresie dozymetrii.

EN

A possibility for radiometric measurements simulation for investigating the type and level of radioactive contamination without using radioactive sources is given in the paper. Operation principles of a pro-ecological electronic model are described. Measurements of beta, gamma and beta + gamma contaminations might be simulated by means of this model. A block diagram, a principle electrical circuit and example results from the simulations made are presented. The pro-ecological model ensures the whole security of students and environment. Operation principles of the given model can be used in educational process and in some other practical tasks in the field of radiometric.