The paper contains description of TI (Time-Interval) measurement system implemented in FPGA (Field-Programmable-Gate-Array) structure whose such parameters as measuring uncertainty and maximal intensity of registered TSs (Time-Stamp) have been improved by the multiplication the number of its components. In this research the resolution has been increased by multiple TDL (Tapped-Delay-Line) use and the maximal intensity has been increased by hardware parallel processing implementation.
The paper presents the design of high resolution TI (Time-Interval) generator implemented into FPGA (Field-Programmable-Gate-Arrays) device, their construction and experimental test results. The resolution improvement is guaranteed by a chain of digitally-controlled delay-elements. Presented TI generator posses two modes of operation. The first mode allows for precise time-interval generation. In the second mode TIs of specified Gaussian distribution may be generated.
Measuring information systems with only one input channel are considered. Those systems characteristic feature is that information part is integrated into a heart of measuring transformation chain. And so output measurand estimates are the result of joint action of measuring and information elements. The problem of the system description and normalization is discussed.
Liquid samples with magnetic particles ingredients were placed into the homogenous magnetic field of an imager based on nuclear magnetic resonance. Theoretical computations based on a magnetostatic models were performed. For experimental verification an MRI 0.2 Tesla ESAOTE Opera imager was used. For modelling and experiments two samples - rectangular and circular were tested. The resultant images corresponds to the magnetic field variations in the vicinity of the samples.
Metrology demands can be found in many phases of a company manufacturing process, from product design to quality control. On the other hand, as a support technology, it is not easy to define metrology’s effective value inside the complex process chain of a large corporation. Indeed, it is made noticeable only when considering the views of various stakeholders. This paper outlines a methodology and main results of a pilot application case based on network theories to increase the perception value of metrology R&D&I inside large corporations, and thus providing a way to commit the budget for...
Aim of the paper is to show that the colorimetric characterization of optically clear colored liquids can be performed with so called dielectric-interference multi-spectral micro sensors in comparison to spectral sensors. Multi-spectral micro sensors and spectral sensors are differentiated by their spectral resolution, measurement speed, accuracy and cost. Multi-spectral micro sensors are less expensive. The paper describes how dielectric-interference multi-spectral micro sensors are calibrated with application specific calibration methods and conventional liquid color standards,...
A new approach, based on the receiver operating characteristics (ROC) technique, is proposed to tackle the problem of adaptive detection of suspected outliers in dynamic measurements. Modelling and analysis are presented and discussed with application to in-process metrology, focusing on adaptive monitoring and control systems.
This paper presents an uncertainty analysis for field measurements by means of a moving fluxmeter. The measurement method has been analysed and the most relevant uncertainty sources have been characterised. Among all the sources, it has been found that those concerning the transport system lead the most relevant contribution to the uncertainty budget. Experimental results, aiming at characterising such sources and determining their contribution to the uncertainty of the measurement, are presented.
Micro-electro-mechanical-system (MEMS) based microphones have grown remarkably in recent years. Their performance has been improving and approaching laboratory standard microphones. One of the challenges that MEMS microphones are facing is to achieve high sensitivity combined with low equivalent input noise (EIN). EIN in dB(A) indicates the lowest A-weighted acoustic pressure level that a microphone can detect relative to 20 µPa under atmospheric pressure. This paper discusses the measurement method, its setup and the associated measurement uncertainty for the EIN of MEMS microphones. The...
Different biometric system architectures based on 3D images can be realized for face recognition. In such systems the triangulation of images provided by a couple of 2D cameras is employed to achieve the 3D features of a face. To setting up the system, different positioning of cameras as well as both kind and resolution of camera could be considered. These parameters can affect the correct decision rate of the system in classifying the input face, especially in presence of image uncertainty. In previous papers, the authors proposed an original approach for the estimation of the confidence...