Abstract
The market for process instruments generally requires low cost devices that are robust, small in size, portable, and usable in-plant. Ultrasonic torsional guided wave sensors have received much attention by researchers for measurement of viscosity and/or density of fluids in recent years. The supporting electronic systems for these sensors providing many different settings of sine-wave signals are bulky and expensive. In contrast, a system based on bursts of square waves instead of sine waves would have a considerable advantage in that respect and could be built using simple integrated circuits at a cost that is orders of magnitude lower than for a windowed sine wave device. This paper explores the possibility of using square wave bursts as the driving signal source for the ultrasonic torsional guided wave viscosity sensor. A simple design of a compact and fully automatic analogue square wave front-end for the sensor is also proposed. The successful operation of the system is demonstrated by using the sensor for measuring the viscosity in a representative fluid. This work provides the basis for design and manufacture of low cost compact standalone ultrasonic guided wave sensors and enlightens the possibility of using coded excitation techniques utilising square wave sequences in such applications.
Highlights
There has been an increasing demand for real-time monitoring and control of fluids both in process and in storage over the past 20 years
This paper explores the possibility of using square wave bursts as the driving signal source and proposes a simple design of a compact and fully automatic analogue square wave front-end for the ultrasonic torsional guided wave sensor
To further validate the applicability of the unipolar and bipolar square wave burst excitation signals in the operation of the ultrasonic torsional guided wave viscosity sensor, attenuation signals in the operation of the ultrasonic torsional guided wave viscosity sensor, attenuation measurements for the T(0,1) mode in 1mm diameter carbon steel rod immersed in olive oil at measurements for the T(0,1) mode in 1mm diameter carbon steel rod immersed in olive oil at frequencies ranging from 525 kHz to 675 kHz with intervals of 25 kHz were carried out
Summary
There has been an increasing demand for real-time monitoring and control of fluids both in process and in storage over the past 20 years. Ultrasonic guided wave sensors have been used to measure viscosity and/or density in liquids by many researchers [7,8,9,10,11,12,13,14,15,16,17,18,19,20,21] They can be formed into robust instruments which are inexpensive enough to be disposable when applied to hazardous materials, or can be used on-line in a process. The electronic systems used in the works outlined above are mainly designed to support a wide range of guided wave experiments in the laboratories and the experiments were mainly done using a windowed sine wave burst as the excitation signal These systems are bulky and expensive, and they can provide for many different signal settings which are not required for monitoring viscosity online and in situ in process plants. Simple design of a compact and fully automatic analogue square wave front-end for the ultrasonic torsional guided wave sensor
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