scholarly journals Enhanced acoustic pressure sensors based on coherent perfect absorber-laser effect

2021 ◽  
Vol 129 (10) ◽  
pp. 104902
Author(s):  
Mohamed Farhat ◽  
Waqas W. Ahmad ◽  
Abdelkrim Khelif ◽  
Khaled N. Salama ◽  
Ying Wu
Keyword(s):  
Acoustic Pressure ◽  
Pressure Sensors ◽  
Perfect Absorber ◽  
Laser Effect ◽  
Coherent Perfect Absorber

scholarly journals Erratum: “Enhanced acoustic pressure sensors based on coherent perfect absorber-laser effect” [J. Appl. Phys. 129, 104902 (2021)]

2021 ◽  
Vol 129 (22) ◽  
pp. 229901
Author(s):  
Mohamed Farhat ◽  
Waqas W. Ahmad ◽  
Abdelkrim Khelif ◽  
Khaled N. Salama ◽  
Ying Wu
Keyword(s):  
Acoustic Pressure ◽  
Pressure Sensors ◽  
Perfect Absorber ◽  
Laser Effect ◽  
Coherent Perfect Absorber

scholarly journals Coherent Perfect Absorber Based on Antisymmetric Metasurface With Gain Material

2020 ◽  
Vol 12 (3) ◽  
pp. 1-9 ◽  
Author(s):  
Ming Chen ◽  
Chen Chen ◽  
Shijie Deng ◽  
Chongyun Wang ◽  
Houquan Liu ◽  
...  
Keyword(s):  
Perfect Absorber ◽  
Gain Material ◽  
Coherent Perfect Absorber

Correlation Analysis of Multiple Sensors for Industrial Gas Turbine Compressor Blade Health Monitoring

2015 ◽  
Vol 137 (11) ◽  
Author(s):  
Brian Kestner ◽  
Tim Lieuwen ◽  
Chris Hill ◽  
Leonard Angello ◽  
Josh Barron ◽  
...  
Keyword(s):  
Gas Turbine ◽  
Acoustic Pressure ◽  
Dynamic Pressure ◽  
Pressure Sensors ◽  
Rotating Stall ◽  
Compressor Blade ◽  
Blade Vibration ◽  
Multiple Sensors ◽  
Dynamic Pressure Measurements ◽  
Industrial Gas Turbine

This paper summarizes an analysis of data obtained from an instrumented compressor of an operational, heavy duty industrial gas turbine; the goal of the aforementioned analysis is to understand some of the fundamental drivers, which may lead to compressor blade vibration. Methodologies are needed to (1) understand the fundamental drivers of compressor blade vibration, (2) quantify the severity of “events,” which accelerate the likelihood of failure and reduce the remaining life of the blade, and (3) proactively detect when these issues are occurring so that the operator can take corrective action. The motivation for this analysis lies in understanding the correlations between different sensors, which may be used to measure the fundamental drivers and blade vibrations. In this study, a variety of dynamic data was acquired from an operating engine, including acoustic pressure, bearing vibration, tip timing, and traditional gas path measurements. The acoustic pressure sensors were installed on the first four compressor stages, while the tip timing was installed on the first stage only. These data show the presence of rotating stall instabilities in the front stages of the compressor, occurring during every startup and shutdown, and manifesting itself as increased amplitude oscillations in the dynamic pressure measurements, which are manifested in blade and bearing vibrations. The data that lead to these observations were acquired during several startup and shutdown events, and clearly show that the amplitude of these instabilities and the rpm at which they occur can vary substantially.

scholarly journals MoS$_2$ Broadband Coherent Perfect Absorber for Terahertz Waves

2016 ◽  
Vol 8 (6) ◽  
pp. 1-7 ◽  
Author(s):  
Weiren Zhu ◽  
Fajun Xiao ◽  
Ming Kang ◽  
Debabrata Sikdar ◽  
Xianling Liang ◽  
...  
Keyword(s):  
Perfect Absorber ◽  
Terahertz Waves ◽  
Coherent Perfect Absorber

scholarly journals Dynamic and Stationary Performance Analysis of Diaphragm Based Acoustic Pressure Sensor

2019 ◽  
Vol 8 (6) ◽  
pp. 4108-4115
Keyword(s):  
Performance Analysis ◽  
Natural Frequency ◽  
Pressure Sensor ◽  
Acoustic Pressure ◽  
Dynamic Pressure ◽  
Dynamic Performance ◽  
Pressure Sensors ◽  
Stress And Strain ◽  
Sensor Structure ◽  
Dynamic Performance Analysis

Pressure sensing and measurement are of utmost importance in many of the process industries and biomedical applications. The key element of the pressure sensor is diaphragm and the diaphragm design including shape and dimensions play a major role in sensitivity of pressure sensor irrespective of the type of sensor viz. capacitive, piezoresistive or piezoelectric sensor. The acoustic pressure sensors require the proper analysis of dynamic performance of the key element since the acoustic source is dynamic pressure. This paper presents the stationary and dynamic performance analysis of diaphragm for piezoelectric acoustic pressure sensor. The analysis has been done for better deflection of the diaphragm and optimized stress and strain in order to achieve maximum sensitivity. In design step, at first the diaphragm is analysed for natural frequency, modal frequencies and bandwidth of the structure since the piezoelectric resonant sensors can be used for sensing whenresonant frequency of the membrane is at least 3 to 5 times the highest applied frequency and for energy harvesting applications, when it is almost equal to the applied frequency.Hence, a comparison of shapes of diaphragm, with their fundamental and modal frequencies, deflection, and stress and strain is established. Further a resonant sensor structure is also analyzed for dynamic performance with cavity neck of different size to understand the importance of cavity neck in dynamic performance of the sensor. The circular diaphragm is found be the best choice from the point of view of maximum deflection and natural frequency and the structure with cavity neck has better bandwidth and deflection.

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