scholarly journals A Wireless Passive Vibration Sensor Based on High-Temperature Ceramic for Harsh Environment

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Chen Li ◽  
Yanan Xue ◽  
Pengyu Jia ◽  
Mangu Jia ◽  
Boshan Sun ◽  
...  
Keyword(s):  
High Temperature ◽  
Structural Design ◽  
Three Dimensional ◽  
Vibration Sensor ◽  
Vibration Measurement ◽  
Harsh Environments ◽  
Vibration Sensors ◽  
High Temperature Mechanical Properties ◽  
Sensitive Structure ◽  
Lc Tank

This paper proposes a wireless passive vibration sensor based on high-temperature ceramics for vibration measurement in harsh environments such as automotive and advanced engines. The sensor can be equivalent to an acceleration-sensitive RF LC resonance tank. The structural design of the LC tank and the signal wireless sensing mechanism are introduced in detail. The high-temperature mechanical properties of the sensitive structure are analyzed using ANSYS at 25–400°C, which proves the usability of the vibration sensor in high-temperature environment. The three-dimensional integrated manufacturing of vibration sensors with a beam-mass structure based on high-temperature ceramics is completed by a bonding process. Finally, the performance of the sensor is tested on a built experimental platform, and the results show that the vibration sensitivity is approximately 1.303 mv/m·s-2, and the nonlinear error is approximately 4.3%. The vibration sensor can work normally within 250°C, and the sensitivity is 0.989 mv/m·s-2.

scholarly journals Fiber Optic Vibration Sensors

2021 ◽  
Author(s):  
Putha Kishore ◽  
Dantala Dinakar ◽  
Manchineellu Padmavathi
Keyword(s):  
Optical Fiber ◽  
Measurement Method ◽  
Fiber Optic ◽  
Sensor Response ◽  
Vibration Sensor ◽  
Vibration Measurement ◽  
Sensor Design ◽  
Plastic Optical Fiber ◽  
Intensity Modulated ◽  
Vibration Sensors

The sensors presented in this chapter are fiber optic intensity modulated vibrations sensors which are non-contact (extrinsic sensor) to the vibrating object. Three sensors presented make use of non-contact vibration measurement method with plastic fiber using distinct designs, improvement of the sensor response and advantages of one sensor over the other for diverse applications. First discussed about dual plastic optical fiber vibration sensor design and its response. Secondly, discussed about 1x2 fused coupler plastic optical fiber vibration sensor design with advantages over the first one. Finally, discussed about the 2x2 fused coupler plastic optical fiber vibration sensor design along with advantages than other two methods. At the end reported the final results with comparison.

scholarly journals An In-Line Fiber Optic Fabry–Perot Sensor for High-Temperature Vibration Measurement

Micromachines ◽  
2020 ◽  
Vol 11 (3) ◽  
pp. 252
Author(s):  
Dong Chen ◽  
Jiang Qian ◽  
Jia Liu ◽  
Baojie Chen ◽  
Guowen An ◽  
...  
Keyword(s):  
High Temperature ◽  
Fiber Optic ◽  
Glass Tube ◽  
Single Mode ◽  
Vibration Sensor ◽  
Vibration Measurement ◽  
Voltage Sensitivity ◽  
Hollow Silica ◽  
Fabry Perot ◽  
Radial Dimension

An in-line fiber optic Fabry–Perot (FP) sensor for high-temperature vibration measurement is proposed and experimentally demonstrated in this paper. We constructed an FP cavity and a mass on single-mode fibers (SMFs) by fusion, and together they were inserted into a hollow silica glass tube (HST) to form a vibration sensor. The radial dimension of the sensor was less than 500 μm. With its all-silica structure, the sensor has the prospect of measuring vibration in high-temperature environments. In our test, the sensor had a resonance frequency of 165 Hz. The voltage sensitivity of the sensor system was about 11.57 mV/g and the nonlinearity was about 2.06%. The sensor could work normally when the temperature was below 500 °C, and the drift of the phase offset point with temperature was 0.84 pm/°C.

The Design of Three-Dimensional Vibration Sensor Based on SOI Microfabbrication

2010 ◽  
Vol 148-149 ◽  
pp. 152-156
Author(s):  
Gui Xiong Shi ◽  
Guo Jun Zhang ◽  
Jiao Xu ◽  
Xiao Yao Wang
Keyword(s):  
Inductively Coupled Plasma ◽  
Three Dimensional ◽  
High Sensitivity ◽  
Measurement Range ◽  
Low Noise ◽  
Vibration Sensor ◽  
Etching Depth ◽  
Inductively Coupled ◽  
Vibration Sensors ◽  
Micro Vibration

Compared with the traditional vibration sensors, the micro-vibration sensor have many advantages, such as small size, high sensitivity and low noise which is based on micro-fabbrication.This paper introduced the micro-vibration sensors which sensitive structure are cilium and micro-elastic beams. The micro-vibration sensors were produced by the inductively coupled plasma technology (ICP), the maximal etching depth of which can be greater than 300μm, the thickness of beam is less than 20μm and the longth of cilium are more than 3000um.The sensitivity of the sensor is 102.5μV/g, the measurement range to +20g, and the resonant frequency is 2KHz.

An Intrinsically Safe Study on Accuracy Wireless Vibration Sensor

2014 ◽  
Vol 1027 ◽  
pp. 290-293
Author(s):  
Jun Li Liu ◽  
Chun Juan Xu ◽  
Li Feng Wang
Keyword(s):  
Information Sources ◽  
Three Dimensional ◽  
The Other ◽  
Vibration Sensor ◽  
Paper Study ◽  
Vibration Data ◽  
Vibration Sensors ◽  
Hardware System ◽  
Mode Vibration ◽  
Promising Solution

In order to solve the problem of shearer automation for the automated mining, analysis and processing by a plurality of sensors or observation information sources is the most promising solution to automatically control the shearer’s posture, while there is no vibration sensors with intrinsically safety that can be directly equipped on the shearers under coal mines. In the paper, study on a new intrinsic safe mode vibration sensor to solve the problem, it includes the hardware system designing and data collection programming. At the end, an experiment proves that the intrinsic safe wireless vibration sensor is able to collection the three-dimensional vibration data reliably and in time compared with the other vibration sensors.

TEM Studies of Grain Boundary Films in Si3N4 Ceramics

1991 ◽  
Vol 49 ◽  
pp. 930-931
Author(s):  
H.-J. Kleebe ◽  
J.S. Vetrano ◽  
J. Bruley ◽  
M. Rühle
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Silicon Nitride ◽  
Hot Isostatic Pressing ◽  
Amorphous Film ◽  
Liquid Phase Sintering ◽  
Second Phase ◽  
High Temperature Mechanical Properties ◽  
Triple Points ◽  
Boundary Films

It is expected that silicon nitride based ceramics will be used as high-temperature structural components. Though much progress has been made in both processing techniques and microstructural control, the mechanical properties required have not yet been achieved. It is thought that the high-temperature mechanical properties of Si3N4 are limited largely by the secondary glassy phases present at triple points. These are due to various oxide additives used to promote liquid-phase sintering. Therefore, many attempts have been performed to crystallize these second phase glassy pockets in order to improve high temperature properties. In addition to the glassy or crystallized second phases at triple points a thin amorphous film exists at two-grain junctions. This thin film is found even in silicon nitride formed by hot isostatic pressing (HIPing) without additives. It has been proposed by Clarke that an amorphous film can exist at two-grain junctions with an equilibrium thickness.

Precipitate coarsening during hot-compression testing of NiAl + 2 at.% Nb

1986 ◽  
Vol 44 ◽  
pp. 598-599
Author(s):  
W. M. Sherman ◽  
K. M. Vedula
Keyword(s):  
High Temperature ◽  
Flow Stress ◽  
Weight Ratio ◽  
Constant Strain Rate ◽  
Hot Compression ◽  
Compression Testing ◽  
Second Phase ◽  
Precipitate Coarsening ◽  
High Temperature Mechanical Properties ◽  
Ordered Intermetallic

The strength to weight ratio and oxidation resistance of NiAl make this ordered intermetallic, with some modifications, an attractive candidate to compete with many superalloys for high temperature applications. Recent studies have shown that the inherent brittleness of many polycrystalline intermetallics can be overcome by micro and macroalloying. It has also been found that the high temperature mechanical properties of NiAl can be enhanced through the addition of Nb by powder metallurgical techniques forming a dispersed second phase through interdiffusion in a polycrystalline matrix. A drop in the flow stress is observed however in a NiAl-2 at.% Nb alloy after 0.2 % strain during constant strain rate hot compression testing at 1025°C. The object of this investigation was to identify the second phase and to determine the cause of the flow stress drop.

Sign in / Sign up

Export Citation Format

Share Document