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A hybrid system for identifying the presence of clouds on the horizon line

Olejnik Arkadiusz, Rychlik Arkadiusz

Technical Sciences / University of Warmia and Mazury in Olsztyn

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2023

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nr 26(1)

249--262

EN

Common passive surveys for the presence of clouds in the sky are carried out using the digital processing of photographs taken using fish-eye type lenses. Another type of survey is carried out using active measuring systems, e.g. thermal imaging, active laser distance sensors, etc. A common feature of these sensors is the high cost of the measuring apparatus, which is hardly acceptable for small local short-term weather forecasting stations. The main task of these weather stations is to forecast local dynamic weather phenomena that have (or may have) an impact on the use or operation of technical facilities (e.g. photovoltaic farms, wind farms, cranes, etc.) or agricultural plant protection measures. This paper proposes a hybrid method for detecting clouds and predicting changes in cloud cover on the horizon line. The proposed method is based on an analysis of colour photographs of the cross-section of the sky using chrominance distribution by the RGB method. In the next step, the CCT colour temperature and the ALS-based ambient light intensity resulting from spectral analysis are determined for the cross-section of the sky being identified. The survey results indicate the dependence of the variability of CCT and ALS parameters for classifying objects on the horizon line. The above analysis makes it possible to distinguish the sky on the horizon, a cloud, or agglomeration elements. The data obtained from the surveys show that the proposed structure of the hybrid system for analysing the presence and movement of clouds on the horizon line can provide the basis for further development of data processing algorithms for a passive sensor of the apparatus for detecting clouds and other objects on the horizon line.

2

Spectrum sensors for detecting type of airport lamps in a light photometry system

Suder Jakub, Podbucki Kacper, Marciniak Tomasz, Dąbrowski Adam

Opto-Electronics Review

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2021

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Vol. 29, No. 4

133--140

EN

The paper analyses the operation of different types of electronic colour sensors based on the light spectrum analysis. The application goal was to detect the type of the airport lamp based on differences in colour components of the light emitted by luminaires with specific spectral characteristics. Recognition of airport lamps is based on the analysis of the light spectrum. Proposed solution allows for an automatic software selection of appropriate conversion factors and comparison with specific standards necessary for this type of measurements. Various types of sensors were discussed and the AS7262 sensor was examined in detail. The colour sensor and the light intensity sensor were used in the mobile control device for examining elevated airport lamps and in the measurement platform for quality testing of embedded airport lamps. Two additional aspects were investigated: 1) influence of an additional acrylic glass cover; 2) distance between airport lamps and the spectrum sensor.

3

Measurement of luminescence in coloured printed materials

McGrath A. D., Vaezi-Nejad S. M.

Metrology and Measurement Systems

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2006

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Vol. 13, nr 3

221-230

EN

While fluorescent pigments have been used for many years, the formulation and quality control of coloured printed materials containing them, has been a challenge, primarily due to lack of appropriate instrumentation at a cost that is economically viable to make the necessary measurements. This paper deals with the economical instrumentation and measurement of fluorescent properties of coloured printed material under investigation. Significance of the correct method of excitation and detection are discussed. Characteristics of desirable commercially available light sources and detectors are also described. Application of one of such a detector for our investigation is considered in some detail.

PL

Pigmenty fluorescencyjne były w użyciu od wielu lat, lecz forma użytkowa i kontrola jakości barwnych drukowanych materiałów zawierających te pigmenty stanowiło wyzwanie, głównie z powodu braku odpowiedniego oprzyrządowania na tyle taniego, że koszt niezbędnych pomiarów byłby do przyjęcia. Niniejszy artykuł omawia oszczędne oprzyrządowanie oraz pomiar własności fluorescencyjnych badanego zadrukowanego kolorowo materiału. Zostało omówione znaczenie właściwej metody pobudzenia i detekcji. Opisane są również potrzebne, dostępne w handlu źródła i detektory światła. Zastosowanie jednego z takich detektorów do badań zostało omówione w szczegółach.