Flow speed and frequency dependencies of vibration transfer by flowing air between tubes in a row are presented. The transfer is increasing linearly with dynamic pressure, but with frequency dependence it is a bit more complicated. Also time histories and frequency spectra of the tube vibration are caught and commented.

Mathematical modelling is a key enabling tool in the analysis and design of measurement systems and measuring instrumentation. This paper highlights the importance and the use of advanced mathematical modelling techniques for design, analysis and performance evaluation of sensors and actuators in measurement and instrumentation systems. After a brief introduction, it illustrates the use of numerical finite element (FE) modelling technique for analysis and design of sensors and actuators. This is based on two case studies in which FE modelling methodologies have been used for the analysis and design of a high performance torque motor actuator and a robust capacitive sensor used in this actuator for angular position sensing. Various modelling considerations are discussed and the methods of their FE realisation are analysed.

Telemetry system is the wireless measuring system constructed with sensing node(s), Host system and communication device(s). The telemetry system becomes the base technology to construct the distributed measurement system to measure in geometrical wide range. Then, it is necessary to keep load balance in the local area sensing network system. In the telemetry system, autonomous operation of the sensing node enhances the effectiveness of telemetry system totally. This paper describes the investigation of operation mode and automatic sampling control in sensing node of telemetry system.

Non-destructive testing techniques are generally used for the evaluation of material properties and the detection of defects in pipelines. Especially, the measurement of magnetic flux leakage (MFL) is one of the most used methods for in-service monitoring of corrosion in buried oil and gas pipelines. However, for the geometrical reconstruction of defects in a pipeline from measured signals (the inverse problem), the magnetic properties of the material need to be known accurately. Due to the pipe geometry and wall thickness measurement of the bulk properties is complicated. In particular, the permeability of ferromagnetic steels shows a non-linear and hysteretic behaviour. Current research is focussed on the measurement and simulation of the permeability of pipeline material. The magnetic properties of a small ferromagnetic test sample is first investigated using a transformer set up in order to find a correct fitting equation for the non-linear permeability as a function of the magnetic flux density. This equation is then used for model simulations of a MFL test set up. Refitting the parameters of the permeability equation to the permeability of the pipeline material in the MFL set up proved that flux leakage signals could be predicted accurately for several defects by model simulation.

The measurement problem of super weak noise signals intensity in super-broad frequency band, which level is much lower than power of the inherent noises of measuring equipment and the external noises is urgent in many fields. The problem of this kind arises in radio astronomy, in radio thermal and plasma radiation measurements. Over last few years the electromagnetic radiation of biological objects, include humans, have been actively studied. Diagnostics of the human body is carried out from the values of radiation parameter proceeding [1]. The paper is devoted to the further development of measurement methods of super weak noise signal intensity in super-broad frequency band.