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Design of a High Frequency Driving Circuit of Surface Acoustic Wave Transducer

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Guan Zhao
Guan Zhao
Guan Zhao
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Open Access Library Journal
2018, Volume 5, e4737
ISSN Online: 2333-9721
ISSN Print: 2333-9705
DOI:
10.4236/oalib.1104737 Jul. 25, 2018 1 Open Access Library Journal
Design of a High Frequency Driving Circuit of
Surface Acoustic Wave Transducer
Guan Zhao
Automotive Engineering College, Shanghai University of Engineering Science, Shanghai, China
Abstract
In this paper, a high frequency driving circuit of surface acoustic wave tran
s-
ducer has been designed to separate oil from oil/water mixed droplet. The
transmission frequency of the surface acoustic wave transducer driving circuit
can be up to 1 MHz. The transmit frequency of conventional ultrasonic dri
v-
ing circuit is mostly 40 kHz.
However, the high transmit frequency driving
circuit presents a good stability and accuracy. By establishing the
surface
acoustic wave driving circuit model, the actual circuit and debugging verific
a-
tion, the driving circuit can excite the frequency signal required for the exp
e-
riment. Thus, the surface acoustic wave driving circuit could provide nece
s-
sary technical support for application in other fields.
Subject Areas
Applied Physics, Electric Engineering
Keywords
Surface Acoustic Wave, Driving Circuit, High Frequency, Transducer
1. Introduction
With the development of industry and the advancement of science and technol-
ogy, ultrasonic technology has been widely developed and used. Ultrasonic
technology has long been gradually integrated into people’s daily lives to become
an inseparable part. Ultrasonic technology has been applied in various fields,
which is usually divided into two major categories of ultrasonic testing and
power ultrasound [1]. For example, hospitals use B-ultrasound to diagnose dis-
eases [2], which is simple, convenient, high diagnostic accuracy. Above all, it can
prevent patients from suffering unnecessary pain. M Yamamoto
et al.
[3] used
How to cite this paper:
Zhao, G. (2018)
Design of a High Frequency Driving Circuit
of Surface Acoustic Wave Transducer
.
Open
Access
Library Journal
,
5
: e4737.
https://doi.org/10.4236/oalib.1104737
Received:
June 24, 2018
Accepted:
July 22, 2018
Published:
July 25, 2018
Copyright
© 2018 by author and Open
Access
Library Inc.
This
work is licensed under the Creative
Commons
Attribution International
License
(CC BY 4.0).
http://creativecommons.org/licenses/by/4.0/
Open Access
G. Zhao
DOI:
10.4236/oalib.1104737 2 Open Access Library Journal
ultrasonic technology to design a sewage flow measurement system and suc-
cessfully achieved accurate measurement of sewage flow. Zhang
et al. [4]
suc-
cessfully designed a car anti-collision system using ultrasonic wireless transmis-
sion and ultrasonic ranging technology. J Tsujino [5] studied the latest technol-
ogy of ultrasonic welding, and Qiu
et al.
[6] conducted numerical simulation
and analysis of ultrasonic traveling wave driving droplet motion on the glass
surface.
However, for practical applications in these fields of ultrasonic technology,
the driving frequency of the drive circuit is mostly 40 kHz, and it is rare for the
high frequency of 1 MHz for the transmission frequency. Therefore, in order
to improve the accuracy, stability, and reliability of related ultrasound experi-
ments. In this paper, a surface acoustic wave transducer driving circuit with a
transmission frequency of up to 1 MHz is designed. Through appropriate de-
bugging, this circuit can stimulate the waveforms required for the experiment
and achieve the functions required to separate oil from an oil/water mixed
droplet.
2. Theory of Surface Acoustic Wave Driving Circuit
In recent years, surface acoustic wave (SAW) technologies have received signifi-
cant attention to be applied in various fields. And the (SAWs) have been used to
drive and manipulate microfluidic flow, such as Rayleigh [7] [8] and Lamb
waves [9] [10]. Some researchers have applied the SAW technologies to make
SAW transducers, which the device can convert electrical energy into sound
energy and convert sound energy into electrical energy. And these technical
characteristics are usually applied in microfluidics community, such as acoustic
microreactors [11], and microseparattors [12].
On the basis of the several potential applications of droplet propulsion and
emulsion separation by using the ultrasonic waves, the SAW driving circuit
could be applied to separate two immiscible liquids. In this study, the surface
acoustic wave driving circuit has functions of operate at high frequency, good
install, low cost, and high efficiency. Flow chart of the SAW driving circuit de-
sign shows in Figure 1.
3. Driving Circuit Design
There are some conventional ultrasonic driving circuits that are used in various
fields [13] (shown in Figures 2-5). However, one of the biggest drawbacks of
these driving circuits is that the frequencies are all 40 kHz, which is not suffi-
cient for the unique field and experiment requirements.
In this design, the function of driving circuit is to amplify the input voltage
through corresponding electronic components and generate SAW with a specific
power, a specific pulse width, and a regular frequency to excite the transducer.
And the driving circuit can obtain the requirements for experiment. The sche-
matic of SAW driving circuit as shown in Figure 6.
G. Zhao
DOI:
10.4236/oalib.1104737 3 Open Access Library Journal
Figure 1. Flow chart of the SAW driving circuit design.
Figure 2. Self-excited driving circuit.
Figure 3. SCR drive circuit.
Figure 4. Dedicated integration of driving circuit.
The schematic of SAW driving circuit is to input DC voltage, which output
interface attained 1 MHz attenuation sine wave pulse. Thus, function of this
driving circuit can be seen as an inverter circuit, which can convert DC power
supply into AC pulse with a frequency of 1 MHz. The switching diode (1SS360)
is applied to control the function of inverter circuit. The voltage stabilizing cir-
cuit consists of zener diode (IN4007) and rectifier diode (1N4003). There are
some field effect transistors has been applied in this driving circuit to be
G. Zhao
DOI:
10.4236/oalib.1104737 4 Open Access Library Journal
Figure 5. Ultrasound transducer driving circuit com-
posed of 55.
Figure 6. Schematic of SAW driving circuit.
integrated easily. And the integration circuit is used to replace triodes, resis-
tances, and diodes that are needed in this designed. Thus, driving circuit of SAW
is high-precision integration.
The important feature of the SAW driving circuit is different from traditional
circuit, which the frequency can up to 1 MHz. It can present good stability, and
high accuracy to be applied to separate oil from an oil/water mixed droplet. In
this experiment, water droplet and oil droplet are mixed to produce an oil/water
mixed droplet as Figure 7(a). The oil/water mixed droplet will be promoted
under the effect of the SAW streaming forces as Figure 7(b). With the time goes
on, the oil/water mixed droplet will get critical separation position as Figure
7(c). At last, the oil droplet will be separated from an oil/water mixed drop as
Figure 7(d). The experiment phenomenon of oil/water mixed droplet separation
process can be seen in Figure 7. And the output interface can be attain 1 MHz
attenuation sine wave pulse of SAW driving circuit as shown in Figure 8.
4. Conclusion
In this design, the SAW driving circuit output interface attains 1 MHz attenua-
tion sine wave pulse. It presents a good stability, and high accuracy by testing.
And the SAW driving circuit that is designed can separate oil from oil/water
mixed droplet. It could provide a good approach to separate oil/water droplet.
The SAW driving circuit could be applied to other ultrasonic technology field of
G. Zhao
DOI:
10.4236/oalib.1104737 5 Open Access Library Journal
Figure 7. Separation process of oil/water mixed droplet.
Figure 8. Attenuation sine wave pulse of SAW driving circuit.
higher precision requirements in the future. And the SAW driving circuit could
be used to separate two kinds of immiscible liquids.
References
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