The excitation frequency on the electrical characteristics of pork had been identified by the experiments of the electrical characteristics and the theory of electrical characteristics, the relationship between the evaluation of quality of pork and the impedance characteristics was established, and a nondestructive portable meter for measuring pork quality was developed. The functions of each h...

This paper deals with some problems of measurement error analysis for flow measurement by electromagnetic flow meter. Two main groups of errors are discussed. The first group of errors is caused by various flow parameters which differ from the flow characteristics during calibration. The authors present a new method of errors estimating, called the moving stream method that allows to estimate o...

− The National Institute of Metrology (Thailand), NIMT, maintains the standard of length in accordance with the definition of the meter through a 633 nm iodine stabilized He-Ne laser. Its accuracy is transferred to stabilized and non-stabilized lasers regarding to beatfrequency method and direct measurement using a wavelength meter, respectively. The traceability in wavelength measurement at th...

This paper outlines the basic installation and operation of magnetic inductive flow velocity sensors on large underground cooling water pipelines. Research on the effects of cathodic protection as well as into other factors that might influence the overall performance of the meter is presented in this paper. The experiments were carried out on an immersion type magnetic meter specially used for...

− The scope here is to derive a model of the measurement error of static energy meters. The model proposed is based on three error parameters: gain, phase and bias error. The validity of the model is confirmed through the statistical analysis of the measurement results obtained during the calibration of a commercial energy meter, compliant with the Measuring Instruments Directive 2004/22/EC. Th...

This paper discusses fundamental issues relative to ultrasonic gas flow meters used for measurement of natural gas. A basic review of an ultrasonic meter’s operation is presented to understand the typical operation of today’s Ultrasonic Gas Flow Meter (USM). The USM’s diagnostic data, in conjunction with gas composition, pressure and temperature, will be reviewed to show how this technology pro...

Today uncertainties of a phase difference of two sinusoidal signals is commonly about 10 μrad for non coherent measurements and signal amplitudes up to several volts. Increasing voltage range of a phase meter requires special considerations. The construction of a special voltage divider intended for precise phase difference measurement is presented in this paper. The uncertainty contribution of...

This paper deals with design, calibration, experimental implementation and validation of cost-effective smart metering system. Goal was to analyse power consumption of the household with the immediate availability of the measured information utilizing modern networked and mobile technologies. Research paper outlines essential principles of the measurement process, document theoretical and pract...

quantum nondemolition measurements Recently, Pryde et al. reported the demonstration of a quantum nondemolition (QND) scheme for single-photon polarization states with linear optics and projective measurements. In this experiment, a single photon with a specific polarization in the signal mode interacts on a beam splitter with a second polarized photon in the meter mode. A destructive polarizat...

With the development of the society, the demand of electric power becomes bigger and bigger. The phenomenon of unbalanced electricity in different time is worse and worse. In order to adjust electric power burthen with reason and save energy, we put forward the design of a novel multi-rate three-phase watt-hour meter. The design principle of a newfashioned multi-rate three-phase watt-hour meter...