Cross Correlation Flowmeters with Ae Sensors
نویسنده
چکیده
This paper is concerned on the new type of the sensing elements for a particle volume of flow rate measurements based on cross correlation flowmeters. The new type of sensing elements exploit the fact that the solid particles being carried by a flowing air and impacting a properly formed obstacle generate an acoustic surface wave (acoustic emission AE). The acoustic signal is indicated by the aid of a high sensitive transducer, which converts the acoustic signal to an electric one. If we use two sensing elements in the flow channel with defined distance, we may use cross correlation technique for calculating transit time and then from time and distance of obstacles the speed of particles.
منابع مشابه
Gas Flow Measurement with Cross Correlation Functions of Ultrasonic Signals Taking Advantage of Artficially Generated Vortices
In spite of many advantages ultrasonic gas flow meters are not generally accepted in the market of flow measuring instruments. Most of them are operating with ultrasonic impulses using the principle of time-of-flight measurement. Vortex frequency measurements up to now don’t use ultrasound for the detection of frequency although the sensitivity can be increased up to ten times and analogue sign...
متن کاملUse of Macro Fibre Composite Transducers as Acoustic Emission Sensors
The need for ever lighter and more efficient aerospace structures and components has led to continuous optimization pushing the limits of structural performance. In order to ensure continued safe operation during long term service it is desirable to develop a structural health monitoring (SHM) system. Acoustic emission (AE) offers great potential for real time global monitoring of aerospace str...
متن کاملAE signals as laser cutting quality indicators
The paper presents results of an analysis of acoustic emission (AE) signals obtained during laser cutting of a steel plate, which is frequently used in the production of automotive body components. The acoustic emission in the plate, which is produced by various physical phenomena occurring during the laser cutting process, was measured with contact PZT sensors. During the laser cutting process...
متن کاملNON-INTRUSIVE PIPE FLOW MEASUREMENT BY CROSS CORRELATION OF TEMPERATURE VARlATIONS
The flow of water in pipes has been measured by placing thermistors at two points along a pipe's surface and measuring the temperature variations (on the order of 30 sec duration) as the fluid passes. Cross correlation of the two sets of temperature versus time data is used to determine the time delay from the upstream to the downstream sensor. The distance between the two sensors is then used ...
متن کاملA New Approach to Laminar Flowmeters
After studying the performance and characteristics of actual laminar flowmeters a new disposition for this type of sensors is proposed in such a way that the measurement errors introduced by the intrinsic nature of the device can be minimized. The preliminary study shows that the developing entry region introduces non-linearity effects in all these devices. These effects bring about not only er...
متن کامل