Quartz-enhanced photoacoustic spectroscopy (QEPAS) sensors are based on a recent approach to photoacoustic detection which employs a quartz tuning fork as an acoustic transducer. These sensors enable detection of trace gases for air quality monitoring, industrial process control, and medical diagnostics. To detect a trace gas, modulated laser radiation is directed between the tines of a tuning ...

The performance of transducers operating at high frequencies is greatly influenced by the properties of the piezoelectric materials used in their fabrication. Selection of an appropriate material for a transducer is based upon many factors, including material properties, transducer area, and frequency of operation. This review article outlines the major developments in the field of piezoelectri...

Accurate fluid flow metering is essential for modern process control, and ultrasonic flow meters are well established in this area. However, the specific acoustic impedance mismatch for most piezoelectric ultrasonic transducers is different when operating liquids and gases, hence there are problems measuring two-phase flows when using a single type of piezoelectric transducer in a flow meter. T...

This paper reports an improvement of the particle-excitation flow control valve. The valve that we have designed in previous reports can control air flow, using particle excitation by piezoelectric resonance, and has the following advantages: small size, lightweight, high response and continuous airflow control. However, in our previous models, the relationship between the driving voltage and t...

In this article, a novel design of piezoelectric dipole transducer is proposed for formation acoustic velocity measurement in the vicinity borehole with frequency range 0.4–6 kHz. The which actuates cylindrical shell to generate pure mode wave by using multiple bender bars analyzed theoretically and simulated numerically finite element method (FEM). Moreover, fabricated tested compare numerical...

When designing the horn of ultrasonic transducer for rotary machining, traditional analytical method cannot consider complex assembly cross-section horn, resulting in a large final simulation error and design error. At same time, when diameter is too large, size back mass obtained by thin. This paper combines four terminal network finite element method, selects sandwich piezoelectric transducer...

The ultrasonic transducer is considered the most important component of ultrasound medical instruments, and its key active layer generally fabricated by piezoelectric materials, such as BaTiO3, Pb (Zn, Ti)O3, PVDF, etc. As star material, perovskite photovoltaic materials (organic inorganic halide CH3NH3PbI3, CsPbI3, etc.) have great potential to be widely used in solar cells, LEDs, detectors, p...