Development of Inplantable Surface Acoustic Wave Sensor for High Voltage Cable Core Temperature Monitoring in Intermediate Joint

In this paper, a kind of implantble passive wireless surface acoustic wave (SAW) sensor and its reader are developed to measure the operation temperature of high voltage crossed-linked cable core. A small type SAW temperature sensor is embedded into cable intermediate joint. A radio frequecny transceiver of the reader based on discrete devices is optimally designed to achieve high signal-to-noise ratio and receiving sensitivity. The characteristic of resonant frequency and temperature of SAW sensor is determined by frequency scan method. Through AC withstand voltage and temperature rise test of 110kV cable, it proves that the prototype can accurately measure the operation temperature of 110kV cable core in intermediate joint under high operation temperature and strong electromagnetic environment.

Download Full-text

Sensitivity Analysis of the Surface Acoustic Wave Sensor towards Size-Distributed Particulate Matter

Shock and Vibration ◽

10.1155/2020/6665508 ◽

2020 ◽

Vol 2020 ◽

pp. 1-10

Author(s):

Jian Yang ◽

Jianan Lu ◽

Shanmeng Zhang ◽

Dong Guan

Keyword(s):

Particulate Matter ◽

Acoustic Wave ◽

Frequency Shift ◽

Size Distribution ◽

Surface Acoustic Wave ◽

Saw Sensor ◽

Lognormal Size Distribution ◽

Acoustic Wave Sensor ◽

Distribution Parameters ◽

Relationship Of

To study the sensitivity of the surface acoustic wave (SAW) sensor towards particulate matter (PM), an analytic model has been built based on single particle perturbation theory of full size range and the lognormal size distribution of the PM. The sensitivity of the frequency shift to 1 nanogram of PM has been calculated. The model shows that the frequency shift is a result of the competition between the negative perturbation by mass loading and the positive perturbation by elastic coupling, determined by particle size distribution parameters, material, and SAW frequency. To verify the model, the relationship of the frequency shift of a 315 MHz SAW to the concentration of aerosols generated by two kinds of powders of different sizes was measured. The experiment is in agreement with the model: the sensor has shown negative sensitivity towards aerosols generated by the finer particles of 1 μm, 3 μm polytetrafluoroethylene (PTFE), and A1 Arizona dust and positive sensitivity towards aerosols generated by the coarser particles of 10 μm PTFE and A4 Arizona dust; and the negative sensitivity is about 1 order higher than the positive.

Download Full-text

A novel method of studying the micro-contact using surface acoustic wave sensor

Sensor Review ◽

10.1108/sr-10-2015-0162 ◽

2016 ◽

Vol 36 (4) ◽

pp. 421-428 ◽

Cited By ~ 1

Author(s):

Jian Yang ◽

Hejuan Chen

Keyword(s):

Mechanical Properties ◽

Acoustic Wave ◽

Surface Acoustic Wave ◽

Coupled System ◽

Content Type ◽

Saw Sensor ◽

Micro Particles ◽

Acoustic Wave Sensor ◽

Coupling Stiffness ◽

Novel Method

Purpose This paper aims to investigate the response behavior of the surface acoustic wave (SAW) sensor under the loading of micro-particles and to evaluate the feasibility of using the SAW sensor to study the micro-contact of the particle–plane interface. Design/methodology/approach An analytical perturbation theory of the coupled system of particle and SAW is presented. It shows that in the weak-coupling regime, the SAW sensor detects the coupling stiffness rather than the additional mass of the particle at the interface. The frequency perturbation formula expressed in parameters of the geometry and mechanical properties of the contact is further derived. The frequency shift of a 262-MHz Rayleigh-type SAW in the oscillation configuration under the loading of multiple starch particles of different sizes has been measured. Findings The experiment results of a linear relationship between the frequency increase and the sum of the radius of particles to the power of 2/3 verified the validity of the theory of linking the SAW response to the geometry and mechanical properties of the contact. Originality/value The SAW sensor could serve as a new candidate for studying the details of mechanical properties of the micro-contact of the interface.

Download Full-text

Surface Acoustic Wave Sensor for C-Reactive Protein Detection

Sensors ◽

10.3390/s20226640 ◽

2020 ◽

Vol 20 (22) ◽

pp. 6640 ◽

Cited By ~ 1

Author(s):

Ming-Jer Jeng ◽

Mukta Sharma ◽

Ying-Chang Li ◽

Yi-Chen Lu ◽

Chia-Yu Yu ◽

...

Keyword(s):

Acoustic Wave ◽

Surface Acoustic Wave ◽

Insertion Loss ◽

Protein Detection ◽

Sensor Response ◽

C Reactive Protein ◽

Response Characteristics ◽

Saw Sensor ◽

Reactive Protein ◽

Acoustic Wave Sensor

A surface acoustic wave (SAW) sensor was investigated for its application in C-reactive protein (CRP) detection. Piezoelectric lithium niobate (LiNbO3) substrates were used to study their frequency response characteristics in a SAW sensor with a CRP sensing area. After the fabrication of the SAW sensor, the immobilization process was performed for CRP/anti-CRP interaction. The CRP/anti-CRP interaction can be detected as mass variations in the sensing area. These mass variations may produce changes in the amplitude of sensor response. It was clearly observed that a CRP concentration of 0.1 μg/mL can be detected in the proposed SAW sensor. A good fitting linear relationship between the detected insertion loss (amplitude) and the concentrations of CRP from 0.1 μg/mL to 1 mg/mL was obtained. The detected shifts in the amplitude of insertion loss in SAW sensors for different CRP concentrations may be useful in the diagnosis of risk of cardiovascular diseases.

Download Full-text

Detection of Particulate Matter of Size 2.5 μm with a Surface-Acoustic-Wave Sensor Combined with a Cyclone Separator

Micromachines ◽

10.3390/mi9080398 ◽

2018 ◽

Vol 9 (8) ◽

pp. 398 ◽

Cited By ~ 3

Author(s):

Fung-Yu Kuo ◽

Ying-Chen Lin ◽

Ling-Yi Ke ◽

Chuen-Jinn Tsai ◽

Da-Jeng Yao

Keyword(s):

Particulate Matter ◽

Acoustic Wave ◽

Surface Acoustic Wave ◽

Limit Of Detection ◽

Cyclone Separator ◽

Saw Sensor ◽

Well Design ◽

Microcentrifuge Tube ◽

Acoustic Wave Sensor ◽

Positive Linear Correlation

A device to monitor particulate matter of size 2.5 μm (PM2.5) that has been designed and developed includes a surface-acoustic-wave sensor operating in a shear horizontal mode (SH-SAW) combined with a cyclone separator. In our tests, aerosols generated as incense smoke were first separated and sampled inside a designed cyclone separator; the sampled PM2.5 was then introduced into the sensing area of an SH-SAW sensor for detection. The use of microcentrifuge tubes as a cyclone separator effectively decreases the size and power consumption of the device; the SAW sensor in a well design and operating at 122 MHz was fabricated with MEMS techniques. After an explanation of the design of the cyclone separator, a simulation of the efficiency and the SAW sensor detection are discussed. A microcentrifuge tube (volume 0.2 mL, inlet and outlet diameters 0.5 mm) as a separator has separation cutoff diameters 50% (d50) at 2.5 μm; the required rate of volumetric flow at the inlet is 0.125 LPM, according to simulation with computational fluid dynamics (CFD) software; the surface-acoustic-wave (SAW) sensor exhibits sensitivity approximately 9 Hz/ng; an experiment for PM2.5 detection conducted with the combined device shows a strong positive linear correlation with a commercial aerosol monitor. The limit of detection (LOD) is 11 μg/m3 with sample time 160 s and total detection duration about 5 min.

Download Full-text

Bilayer Structure Based Surface Acoustic Wave Sensor for Formaldehyde Detection

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.664.986 ◽

2013 ◽

Vol 664 ◽

pp. 986-989 ◽

Cited By ~ 1

Author(s):

Zhi Hua Ying ◽

Jia Hu ◽

Cong Ping Wu ◽

Yi Qing Yang ◽

Liang Zheng ◽

...

Keyword(s):

Acoustic Wave ◽

Surface Acoustic Wave ◽

Room Temperature ◽

High Sensitivity ◽

Bilayer Structure ◽

Coating Materials ◽

Saw Sensor ◽

Acoustic Wave Sensor ◽

Recovery Times ◽

Response And Recovery

This study contributes to the measurements of formaldehyde at room temperature. A bilayer structure based surface acoustic wave (SAW) sensor has been fabricated and experimentally studied. The coating materials carbon nanotubes (CNTs) and poly (4-vinylphenol) (P4VP) were deposited by a spray-painting method onto SAW sensors configured as 433.92MHz two-port resonator-based oscillators. The results display high sensitivity and entirely reversibility. The response and recovery times of the bilayer structure are very short, and the response values are obviously greater than plus of the two single layers. Some sensing mechanisms between analytes and the bilayer structure SAW sensor will be discussed preliminarily.

Download Full-text