A Wireless Passive SAW Delay Line Temperature and Pressure Sensor for Monitoring Water Distribution System

Abstract

Wireless passive surface acoustic wave (SAW) sensor has been widely used in many applications. This paper presents a feasibility study on a designed wireless passive SAW delay line temperature and pressure sensor for monitoring water distribution systems. The substrate of the sensor node is a Y-Z orientation cut LiNbO3 crystalline with 0.5 mm thickness. The Interdigital transducer (IDT) was fabricated centrally on the surface of the substrate with an antenna connected. There are three reflectors fabricated on the same surface of the IDT. One reflector is on one side and the other two are on the other side of the IDT. A simulated water pipe platform with testing devices was assembled to test the feasibility of the sensor node working in water pipe environment. The experimental result showed that the designed sensor worked properly but 4/5 amplitude of signals is lost compared to the experimental results in the open-air environment.

Acoustic Biosensors and Microfluidic Devices in the Decennium: Principles and Applications

“…This operating frequency is almost more than 100 times higher than that of bulk waves in QCM. SAW devices have significant advantages in electronic devices, in terms of miniature size, low cost, ease of manufacture, and all electrical readout, which makes them suitable for applications, such as resonators [218]; filters [219,220]; radio frequency identification [221]; chemical sensors [222][223][224][225][226]; pressure sensors [227,228]; temperature sensors [229][230][231]; strain sensors [232]; and biosensors [40,233,234]. The first reported SAW-based sensor was in 1979, which was used for chemical gas sensing using both quartz and LiNbO3 substrates [235].…”

A Multi-Iteration Enhanced 2P-SMA Method for Improved Error Reduction on a WP-SAW Water Temperature and Pressure Sensor

“…The newly designed and fabricated WP-SAW sensor node is a WP-SAW reflective delay line temperature and pressure sensor node fabricated on a 0.5 mm thick Y-Z cut LiNbO3 piezoelectric crystal substrate, which has been presented in our previous work [34]- [38]. Table 1 shows the parameters of this WP-SAW sensor, and Figure 3 shows the structure of this WP-SAW sensor node.…”

Design of a low-cost wireless reader for an electromagnetic passive temperature sensor

“…Los sistemas sin chip en el dominio del tiempo típicamente usan líneas de retardo con un elemento transductor, así, cuando la unidad de lectura envía una señal pulsada al sensor pasivo, este elemento modula el pulso con la información de medida. El retardo evita el solapamiento entre los pulsos incidente y modulado [74][75][76][77][78]. El sistema para medir termperatura que se propone en [74] presenta la típica estructura de un sensor en el dominio del tiempo.…”