This paper contains the processing formula of an inductive transducer in an immersion version for contactless measurements of conductivity of conductive media. In this version, a winding has been wound round an insulating stick in the form of a short coil. Such a construction enables us to easily place the transducer in the investigated medium. Dependencies determining the influence of the electric and magnetic properties of the walls of the vessel, which contains the investigated medium upon the transfer function of the transducer have also been formulated. These dependencies can also be...
Self controlled sensor system to input signal condition, sampling and signal/data processing operates flexibly to change by measurement environment and measuring object. In telemetry system, distributed autonomous sensor system expands the geometrical measuring range from a point to a plane. Moreover in the local area network of sensor system by wireless communication, the autonomous sensor system enhances cooperation between systems and realizes data exchange and storage in common. This paper describes the hardware construction and operation modes of the autonomous sensor system(sensing...
Basic functional model for random signal is presented for use in measurement theory. That is H(R) - reproducing kernel Hilbert space (RK-space), produced by the correlation function R(s, t) of random process x (t). RK-space H(R) presents an isomorphic representation of the process x(t). So it provides an adequate mathematical tool for solving several problems, such as linear filtering, extrapolation of random signal, and deterministic signal extraction from noise. Besides, the corresponding RK-norms are useful in metrology for employing as the measurement accuracy characteristics. As an...
The results of research of evaluation error of the coverage factor with approximate method of effective number degrees of freedom in indirect measurements have been presented in the paper. Comparison of the results obtained with the known evaluation of these errors in direct measurements enabled to determine the change tendency of the errors of coverage factor evaluation, when the number of components of standard uncertainties grows. The knowledge of coverage factor characteristics for the convolution of three selected probability distributions was used for the research.
Various ways to realize ratiometric principle of liquid media turbidity measurement are reviewed. The principle allows to minimize in-line optical turbidimiters errors caused by soiling on windows of irradiators and photodetectors. As traditional as novel solutions are described. An idea to apply artificial neural networks for turbidimeters signal processing is stated. Some own practical results are presented.
Measurement of liquefied petroleum gas quantitative parameters are considered. Radiofrequency measurement method is proposed providine highly accurate determination of level (gas-liquid interface position), density and mass of liquid and gaseous phases, total mass. Three RF-sensors (two level sensors , gas dielectric permittivity sensor) are contained in the designed RF devices. Informative parameters (resonant frequencies of electromagnetic oscillations) of these RF sensors are jointly processed providing the needed data. Experimental procedures are described and measurement results are...
The paper presents an enhanced learning and training system in data acquisition. This new method is the result of an interactive process for enhancing the learning activities for the students. The system was built to meet a new concept: "integrated learning", an approach that allows students to exercise their abilities in real applications. These applications are entirely specified, having well-defined constructive structures and well-known finish lines. The hardware platforms are built in layers, the most suitable solution for the multi-field approach. Working like this, the students have...
This paper presents an experimental system for cutting research. System is based on high-speed laser light source, CCD camera and high-speed acquisition of acoustic emission (AE) signal. As a result, high-resolution images and AE signal are obtained simultaneously. This information can be used for cutting research and for research of AE sources.
The indirect measurement methods like as image processing measurement are preferably used on the factory automation system because the complex data processing are requested on higher level measurement. On this case, the video system is regarded as the transducer, signal transmitter, signal conditioner and interface unit for a computer, and this system requires low costs by the mass production effect and has easiness of handling. On higher-level measurement, electric quantity must be changed to appropriate projective space though the electric quantity is directly used in the usual measurement...
In this paper the problem how to estimate the time-of-flight of a received acoustic tone burst is addressed. In indoor applications, reflections cause interference patterns that are hardly predictable and can lead to large estimation errors. A generalisation of the well-known matched filter based on a non-stationary autocovariance model of the reflections allows us to develop a new estimator. Experiments show that the application of the new estimator can reduce these errors by about a factor four.