Domen Hudoklin

• PhD
• University of Ljubljana

The polymeric insulating materials widely used in measuring instrument enclosures must meet specific flammability requirements. In this study, we systematically assessed the impact of minor compositional changes, such as pigments and fillers, on horizontal burning (HB) classification according to the EN 60695-11-10 standard. We tested 64 polymer co...

This paper presents a method for improving the non-parametric frequency estimation of the fundamental periodicity of a multi-frequency signal when a smaller number of periods are covered - up to two periods in the measurement time. The estimation procedure uses the weights of two Rife-Vincent I windows on the same set of acquired signal samples and...

International comparisons of relative humidity scales at the highest level are often challenging because of significant drift of the impedance-based transfer standard, which reduces the accuracy of comparison. Comparisons that are shorter or have fewer participants may be less affected by drift, but ultimately require more inter-linking with their...

The aim of this paper is to present how a higher income can be achieved by developing a broader and more accurate planning framework and control perishability from stable to fork if it is possible to redirect the shipments in the case of increasing perishability dynamics or longer time delays on the roads. It also gives the answer to the question o...

The control and measurement of humidity is important for many industrial applications and to ensure the appropriate storage of materials and products. Humidity measurement techniques are diverse and each presents different challenges for use and calibration for a range of pressures and gases. Over the past few years, the development of humidity sen...

Launched in 2011 within the European Metrology Research Programme (EMRP) of EURAMET, the joint research project "MeteoMet" – Metrology for Meteorology – is the largest EMRP consortium: National Metrology Institutes, Universities, meteorological and climate agencies, Research Institutes, collaborators and manufacturers are working together, developi...

A European research project METefnet addresses a fundamental obstacle to improving energy-intensive drying process control: due to ambiguous reference analysis methods and insufficient methods for estimating uncertainty in moisture measurements, the achievable accuracy in the past was limited and measurement uncertainties were largely unknown. This...

The object of the proposed paper is to design and analyze the performance of a non-contact heart rate variability (HRV) measuring device based on ultrasound transducers. The rationale behind non-contact HRV measurement is the goal of obtaining a means of long term monitoring of a patient’s heart performance. Due to its complexity as a non-contact m...

In the supply chain of fresh fruit and vegetables, large losses may incurred throughout the whole farm to fork route. Food supply chain management is faced with challenges of minimizing the post-harvest loss, while delivering the items directly to the refrigerators in smart homes (i.e. domotics). A substantial value can therefore be added to the cr...

In the supply chain of fresh fruit and vegetables, large losses may incurred throughout the whole farm to fork route. Food supply chain management is faced with challenges of minimizing the post-harvest loss, while delivering the items directly to the refrigerators in smart homes (i.e. domotics). A substantial value can therefore be added to the cr...

Surface moisture measurement system is improved and tested to ensure reliable measurements in a production line. The robust parts of the system are made from the prototypes. The choice of the right components and housing together with testing and adaptations are crucial in assuring a proper operation of the system. The system is based on an NIR las...

The study describes significant outcomes of the ‘Metrology for Meteorology’ project, MeteoMet, which is an attempt to bridge the meteorological and metrological communities. The concept of traceability, an idea used in both fields but with a subtle difference in meaning, is at the heart of the project. For meteorology, a traceable measurement is th...

The reliability of ground-based measurements is important in a variety of meteorological areas, such as weather forecasts, air quality and climate. In order to improve this reliability, closer co-operation with the metrological community has been established. This paper looks at another possible route for improvements, based on carrying out a quali...

In addition to bulk moisture, the measurement of moisture profiles is very important in pharmacy, the food, construction and car industries, the military, etc. In special cases, moisture in the upper layers, close to the surface and at the surface, affects various processes more intensively. Existing measuring principles, such as those based on nu...

Traceability in the field of relative humidity (RH) measurements is typicallyassured indirectly through dew point and temperature scales. Conducting an inter-laboratory comparison at the national metrology institute (NMI) level, using a direct approach with a precision RH hygrometer as a transfer standard would, therefore, be of a particular intere...

The study describes significant outcomes of the ‘Metrology for Meteorology’ project, MeteoMet , which is an attempt to bridge the meteorological and metrological communities. The concept of traceability, an idea used in both fields but with a subtle difference in meaning, is at the heart of the project. For meteorology, a traceable measurement is t...

The project MeteoMet is aiming to respond to the needs for new stable and traceable measurement standards, protocols, sensors and calibration procedures, and uncertainty-evaluation methods, to enhance data reliability and reduce uncertainties in climate models. This project is part of the European Metrology Research Program (EMRP) coordinated by th...

The dynamics of water-vapor dissolution in Viton O-rings is measured with a gravimetric method using a precise mass comparator. A sample gasket was degassed in high vacuum for a sufficiently long period to remove more than 99 % of the dissolved water vapor. After that, it was exposed to the ambient atmosphere with a controlled temperature, and rela...

In the framework of EMRP (European Metrology Research Program) the project “MeteoMet - Metrology for Meteorology” (www.meteomet.org) aspires to respond to the questions and needs of meteorological community for traceable measurement and comprehensive in-field uncertainity measurement budgets. The metrological traceability of an instrument or sensor...

In the contest of the European MeteoMet project, a rigorous metrological approach is applied to measurements of atmospheric parameters such as temperature, pressure, humidity and airspeed in the atmosphere. This approach is addressed to both the study of new instruments and the definition of calibration procedures through the development of new ded...

Psychrometers remain the most widely used instruments for controlling the humidity in climatic test chambers, yet the calibration of these instruments is particularly challenging. Psychrometer calibrations require careful consideration of influence variables such as the fitting and cleanliness of the wick, the effect of the calibration chamber on t...

The measurement of the water-vapor permeation rate (WVPR) through materials is very important in many industrial applications such as the development of new fabrics and construction materials, in the semiconductor industry, packaging, vacuum techniques, etc. The demand for this kind of measurement grows considerably and thus many different methods...

Metrology often takes an important part in robotics. Reversed relation, where robotics is employed in metrology, however, is less often met. The paper investigates the use of a robot for evaluation of spatial uniformity of precision current clamp. Robot moves the clamp around the conductor, where effect of clamp windings position on a measured curr...

In the field of humidity quantities, the first CIPM key comparison, CCT-K6 is at its end. The corresponding European regional key comparison, EUROMET.T-K6, was completed in early 2008, about 4years after the starting initial measurements in the project. In total, 24 NMIs from different countries took part in the comparison. This number includes 22...

Measuring equipment is often complex and expensive. So training on a simulation in virtual experiments is in many cases a good idea, especially if it is conducted over the internet. On the other hand, mathematical models, needed for the simulation of a complex measuring device and complex measuring phenomena have limited efficiency. For this reason...

The article discusses the design and results of the initial testing of a primary single pressure dew-point generator, which is used for calibration of the top-end dew-point sensors and other types of humidity sensors. The dew-point generator operates in the dew/frost-point range from −60°C up to +80°C. The first experiments indicate that the expand...

According to requirements of the ISO/IEC 17025:2005 standard, environmental conditions while calibrating are monitored and stated in the calibration certificate. In this paper we present an experiment for evaluation of the behavior of our on-site measuring equipment regarding its specifications and the suitability of these specifications for our ty...

Precise humidity measurements conducted with a chilled-mirror hygrometer (CMH) in the frost-point range require the determination of the condensate phase on the sensor’s mirror. Undetected supercooled water (SCW) on the surface of the mirror can lead to an error in frost point reading of up to 2K or more. A recent trend in CMH design is implementat...

In the field of hygrometry, a primary dew-point standard can be realized according to several proven principles, such as single-pressure (1-P), two-pressure (2-P), or divided flow. Different realizations have been introduced by various national laboratories, each resulting in a stand-alone complex generation system. Recent trends in generator desig...

The objective of the following paper is to discuss the preparation and usage of adequate input parameters (called reference data sets) for efficient testing of temperature measurement software modules, applying the white‐box software testing strategy. Furthermore, the extension of the suggested approach is presented in an area of intercomparison...

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The objective of this paper is to analyze major error sources in the process of simultaneous calibration of a large number of thermocouples (TCs). The main reason for the occurrence of additional error sources when a large number of TCs are simultaneously calibrated is due to additional inhomogeneity effects and characteristics of a particular meas...

An automated system for evaluation of climatic chambers is presented. Besides automation, basic emphasis is given to the reliability of operation, flexibility and possibility of achieving minimal uncertainty for a given application. The system is developed to completely satisfy all standards and requirements concerning evaluation and/or calibration...

The objective of the paper is to analyze major error sources in the process of simultaneous calibration of large number of thermocouples (TC). The main reason for occurrence of additional error sources when large numbers of thermocouples are simultaneously calibrated is due to additional inhomogeneity effects and specifics of a particular measuring...

Solutions regarding the publishing of examination results over the internet are presented. The system that was developed uses data obtained from the database of an existent faculty system, installed in local computer network for security reasons. Apart from publishing examination results it provides also publishing of particular information about e...

In the paper we compare the predictive abilities of several types of neural networks in order to use them for voltage correction in a high precision solid state DC voltage reference source (DCVRS). The observed time series are characterised as outputs of nonlinear dynamical system. Networks are trained until the correlation dimension and the leadin...

In the proposed paper the influence of motor aspirated psychrometer on calibration process is investigated. Proper humidity measurement with psychrometer requires sample gas stream of sufficient velocity in order to achieve accurate measurements. For this reason modern psychrometer typically have integrated aspiration motor to assure such gas strea...

In the paper results of measuring the climatic conditions (temperature and relative humidity) in vehicles, which are exposed to the s un, will be presented. The measurements will be analysed with respect to the type of a vehicle, colour, availability of air-condition, and weather conditions.