Power quality assessment is a complex measurement task, requiring the usage of a system with suitable metrological properties. This complex measurement task in the real power grid is performed with the use of power quality analysers that measure and record the parameters determining the power quality. The paper presents selected research results for a class A power quality analyser in the specially prepared measurement system containing measuring instruments calibrated by the Main Office of Measures. The measurement results were completed with a presentation of the uncertainty budget. The influence of the phenomenon of spectrum leakage on metrological properties of the tested power quality analyser was considered in the paper. To assess this influence, the simulation studies with the use of MATLAB and the experimental studies were carried out for selected test signals. The Metrological interpretation of the research results is presented in the paper.

The pedestrian is the least protected road user. A large number of accidents involving pedestrians occur at pedestrian crossings. Bad lighting or a complete lack of it is one of the causes of accidents in these places. Currently, there are no uniform requirements in Europe for the lighting of pedestrian crossings. Each country is trying to create its system of requirements and assessment of lighting of pedestrian crossings. Measurement procedures and required lighting parameter values often vary significantly across countries. This paper discusses the results of measurements carried out at selected pedestrian crossings using two different measurement grids. The lighting quality at the tested crossings has been assessed based on the lighting requirements in force in two EU countries. In addition, we present the results for the illuminance contrast of a measurement board, representing the silhouette of a pedestrian on a crossing, with the background. Based on the determined contrast, we attempted to verify the lighting conditions using an evaluation system described in the literature, which employs fuzzy logic algorithms.

This article examines the potential risk of impaired visibility for drivers caused by sunlight reflecting off the surfaces of PV panels installed within the right-of-way of motorways and expressways. A literature review was conducted to describe the current state of knowledge and identify the requirements applicable to this area. The procedures for measuring the reflective properties of PV panels using a goniophotometer and a luminance camera (imaging luminance measuring device—ILMD) were evaluated. The measurement results for three PV panels with different surface structures are presented, allowing the properties of PV panels to be determined in terms of their potential impact on driver safety. A computer application was developed to determine whether the sun’s rays will reflect off a photovoltaic panel’s surface toward a vehicle’s direction of travel. The application graphically displays information on whether the sun will be reflected in the direction of a moving vehicle and whether this reflection poses a threat to driver safety. A comprehensive procedure for assessing the risk of glare caused by sunlight reflecting off the surfaces of photovoltaic panels was developed, along with detailed requirements. This study supports sustainable development by promoting renewable energy deployment in motorway corridors while simultaneously ensuring road safety. It integrates environmental (renewable energy use), social (driver safety), and technical (quantitative glare assessment methods) dimensions of sustainability.

Photoluminescent strips forming a Low Location Lighting (LLL) system are the primary method for marking escape routes on passenger ships. The LLL system can be built as a self-luminous system (powered by electricity) or made as a series of strips made of photoluminescent materials, which glow and indicate the escape route after the loss of basic and emergency lighting. To ensure correct visual guidance, these strips must be installed at specific locations in the passageways and achieve appropriate photometric parameters after a certain time from their activation. The properties of the LLL system depend on the type of luminescent material used, the excitation source, and the exposure parameters. This paper presents the results of laboratory tests on two types of photoluminescent materials used for the construction of LLL systems. We recorded the change in luminance after the loss of excitation and measured the luminance values obtained 10 and 60 min after the loss of excitation under exposure to light sources commonly used for interior lighting on passenger ships. It turns out that replacing fluorescent lamps with LED lamps can reduce the luminance of the LLL system.

For 30 years the photometric descriptions of luminaires that are used in simulation, design and photometric calculations have not changed. For many years, technology did not allow for the detailing of digital photometric data of light sources and luminaires. In the second decade of the 21st century digital luminance cameras debuted on the markct., Theoretically these cameras offered the possibility of changing digital descriptions of luminaire parameters. Unfortunately, the huge amount of digital data associated with a single light source (even in excess of 1TB) significantly halted the development in this area. The author of this publication with his team developed a luminance camera, optimisation and verification algorithms which were used to propose the novel simplified luminance description of luminaires and light sources based on advanced methods of digital analysis of luminance data. This publication presents the result of the implementation of the presented method and compares it with the results from the popular lighting simulation calculation programs.