scholarly journals Seabird Biologging System with Compact Waterproof Airflow Sensor

2021 ◽  
Vol 33 (3) ◽  
pp. 466-474
Author(s):  
Hidetoshi Takahashi ◽  
Masaru Naruoka ◽  
Yoshinobu Inada ◽  
Katsufumi Sato ◽  
◽  
...  
Keyword(s):  
Dorsal Surface ◽  
Micro Electro Mechanical System ◽  
Pitot Tube ◽  
Flight Performance ◽  
Airflow Velocity ◽  
Mems Sensor ◽  
System A ◽  
Tube Type ◽  
Direct Measurement Method ◽  
Airflow Sensor

This paper presents a seabird biologging system with a compact waterproof airflow sensor. Although biologging methods have attracted attention in the evaluation of seabird flight performance, a direct measurement method of airflow velocity has not yet been established. When an airflow sensor is added to a biologging system, a more accurate assessment of the flight performance can be obtained. We developed a compact Pitot tube-type airflow sensor that is specialized for seabird biologging systems. Here, we integrated micro electro mechanical system (MEMS) sensor chips and a sensing circuit into the Pitot tube housing. Then, we conducted a wind tunnel experiment using a stuffed seabird and the fabricated sensor. The results confirmed that the sensor responds to the wind speed even when attached to the dorsal surface of the seabird. Based on the above, we believe that the proposed sensor can be applied to practical seabird biologging systems.

Waterproof Pitot-tube-type airflow sensor for bio-logging of seabird

2018 ◽  
Vol 2018.9 (0) ◽  
pp. 31pm2PN84
Author(s):  
Hidetoshi Takahashi ◽  
Akihito Nakai ◽  
Isao Shimoyama
Keyword(s):  
Pitot Tube ◽  
Tube Type ◽  
Airflow Sensor

Fabrication of a polyvinylidene difluoride fiber with a metal core and its application as directional air flow sensor

2016 ◽  
Vol 09 (01) ◽  
pp. 1650001 ◽  
Author(s):  
Yixiang Bian ◽  
Rongrong Liu ◽  
Shen Hui
Keyword(s):  
Air Flow ◽  
Hot Extrusion ◽  
Metal Core ◽  
Beam Structure ◽  
Airflow Velocity ◽  
Polyvinylidene Difluoride ◽  
Surface Electrodes ◽  
Flow Changes ◽  
Airflow Sensor ◽  
Piezoelectric Fiber

We fabricated a sensitive air flow detector that mimic the sensing mechanism found at the tail of some insects. [see Y. Yang, A. Klein, H. Bleckmann and C. Liu, Appl. Phys. Lett. 99(2) (2011); J. J. Heys, T. Gedeon, B. C. Knott and Y. Kim, J. Biomech. 41(5), 977 (2008); J. Tao and X. Yu, Smart Mat. Struct. 21(11) (2012)]. Our bionic airflow sensor uses a polyvinylidene difluoride (PVDF) microfiber with a molybdenum core which we produced with the hot extrusion tensile method. The surface of the fiber is partially coated with conductive silver adhesive that serve as surface electrodes. A third electrode, the metal core is used to polarize polyvinylidene difluoride (PVDF) under the surface electrodes. The cantilever beam structure of the prepared symmetric electrodes of metal core piezoelectric fiber (SMPF) is used as the artificial hair airflow sensor. The surface electrodes are used to measure output voltage. Our theoretical and experimental results show that the SMPF responds fast to air flow changes, the output charge has an exponential correlation with airflow velocity and a cosine relation with the direction of airflow. Our bionic airflow sensor with directional sensing ability can also measure air flow amplitude. [see H. Droogendijk, R. G. P. Sanders and G. J. M. Krijnen, New J. Phys. 15 (2013)]. By using two surface electrodes, our sensing circuit further improves sensitivity.

scholarly journals Vibration parameters measuring system of rotate mechanical based on MEMS sensor

2018 ◽  
Vol 189 ◽  
pp. 11004
Author(s):  
Jun Chen ◽  
Tao Zhou
Keyword(s):  
Mathematical Modeling ◽  
Noise Reduction ◽  
Vibration Amplitude ◽  
Micro Electro Mechanical System ◽  
Measuring System ◽  
Vibration Parameter ◽  
System Technology ◽  
Mems Sensor ◽  
Vibration Parameters ◽  
Micro Accelerometer

In this work, a novel vibration parameter measure instrument of rotate machine using a accelerometer is proposed. The ADXL203 micro accelerometer is used as the sensor of the instrument based on the MEMS (Micro Electro Mechanical System) technology. The mathematical modeling of the vibration is finished by the simple harmonic vibration theory. The noise of the system is disposed by the differential noise reduction circuit. The experiments such as differential noise reduction, frequency and vibration amplitude measurement are finished on the platform. The results indicate that the instrument is useful and effective.

Position Alignment of Micro Manipulator Using Root Mean Square Errors for Maskless Lithography System

2013 ◽  
Author(s):  
Yong Seok Ihn ◽  
Sae Whan Park ◽  
Ja Choon Koo
Keyword(s):  
Micro Electro Mechanical System ◽  
Maskless Lithography ◽  
Flat Panel Display ◽  
Mems Devices ◽  
System A ◽  
The Status ◽  
Volume Production ◽  
Mean Square Errors ◽  
Lithography System ◽  
Exposure Process

A precision optical exposure process of lithography has become one of the essential processes to manufacture and develop micro electro mechanical system (MEMS) devices, flat panel display (FPD), and semiconductor. For a typical exposure process for the lithography, a photomask that is often very expensive is required to generate patterns[1]. So it is very inefficient not only in terms of cost but also the time due to the reliance on the photomasks in development. The alternative solution is the maskless lithography system, which does not use photomasks since the patterns are generated by using a digital mirror device (DMD). The unit mirror of a digital mirror device has two kinds of status which are on and off, then the status of unit mirrors configures a pattern called point array method. The maskless lithography system can reduce the amount of work forces significantly and save money as well. However, the maskless lithography system has a critical drawback, which is a low throughput since the patterns are generated in a line. This is an intrinsic problem of point array method. So in most volume production processes of maskless lithography system, a number of optical heads are used in order to maximize throughput of the expositing process. And to guarantee the exposure quality, multiple numbers of optical heads should be accurately aligned to each other, and then the focal plane of each optical head is also well aligned with chuck.

New Style Four-Electrode MEMS Conductivity Chip

2011 ◽  
Vol 483 ◽  
pp. 475-480
Author(s):  
Shao Hua Wu ◽  
Zhan Zhao ◽  
Zhen Fang ◽  
Li Dong Du ◽  
Dao Qu Geng ◽  
...  
Keyword(s):  
Conductivity Measurement ◽  
Test System ◽  
Planar Structure ◽  
Ansys Simulation ◽  
Mems Sensor ◽  
System A ◽  
Conductivity Sensor ◽  
Good Ability ◽  
Mems Technology ◽  
Solution Conductivity

MEMS sensor for solution conductivity measurement has been applied widely which has many advantages such as cheap, accurate, batch fabricate, and good consistent etc. Existent MEMS conductivity sensors usually have planar structure with four short parallel electrodes so that the two voltage electrodes are tend to be polluted and consequently lead to mistakes for the conductivity test system. A new pattern of conductivity chip with an annular voltage electrode to enhance the ability of anti-pollution based on MEMS technology is going to be introduced in this article; the ANSYS simulation is applied to help demonstrate the reasons why the new pattern of conductivity chip has good ability of anti-pollution and the experiment results are also presented to show the performance of the conductivity sensor.

Design and Simulation of MEMS Sensor for Detection of Arterial Pulse

2018 ◽  
Vol 17 (2) ◽  
pp. 7247-7260
Author(s):  
Sonali Navghare
Keyword(s):  
Piezoelectric Effect ◽  
Biomedical Application ◽  
Applied Pressure ◽  
Electrical Potential ◽  
Fem Analysis ◽  
Piezoelectric Sensor ◽  
Micro Electro Mechanical System ◽  
Arterial Pulse ◽  
Mems Sensor ◽  
Circular Diaphragm

The work presented in this paper describe the design and simulation of a MEMS (Micro Electro Mechanical System) system based piezoelectric sensor for detecting arterial pulse in biomedical application. The study is done through the analysis of square and circular diaphragm made out of piezoelectric and MEMS material. In this work, piezoelectric material is used which work on the principle of piezoelectric effect. In piezoelectric effect, diaphragm reorients under stress, form an internal polarization which result in crystal charge on the crystal face that is proportional to applied pressure. When pressure is applied on diaphragm deformation occurs which converts physical energy into output electrical voltage. For selecting the appropriate geometry and material for sensor design different parameter were checked such as deformation, output voltage, Stress and linearity. FEM analysis is done for circular and square diaphragm on COMSOL Multi-Physics. Comparison of square and circular diaphragm is done on the basis of deformation and Electrical potential. Piezoelectric sensor is designed and simulated with lithium-Niobate and poly-si. Sensitivity obtained for the designed sensor is about 4mV/Kpa.

scholarly journals Comparison of a micro-electro-mechanical system airflow sensor with the pneumotach in the forced oscillation technique

2018 ◽  
Vol Volume 11 ◽  
pp. 419-426 ◽  
Author(s):  
Xiaohe K Xu ◽  
Brian P Harvey ◽  
Kenneth R Lutchen ◽  
Brian D Gelbman ◽  
Stephen L Monfre ◽  
...  
Keyword(s):  
Mechanical System ◽  
Forced Oscillation ◽  
Micro Electro Mechanical System ◽  
Forced Oscillation Technique ◽  
Airflow Sensor

scholarly journals A 3D Wrist Pulse Signal Acquisition System for Width Information of Pulse Wave

Sensors ◽  
2019 ◽  
Vol 20 (1) ◽  
pp. 11 ◽  
Author(s):  
Chuanglu Chen ◽  
Zhiqiang Li ◽  
Yitao Zhang ◽  
Shaolong Zhang ◽  
Jiena Hou ◽  
...  
Keyword(s):  
Sensor Array ◽  
Pulse Wave ◽  
Pulse Signal ◽  
Micro Electro Mechanical System ◽  
Acquisition System ◽  
Measuring Instruments ◽  
Signal Acquisition ◽  
Mems Sensor ◽  
Signal Collection ◽  
Pulse Waves

During pulse signal collection, width information of pulse waves is essential for the diagnosis of disease. However, currently used measuring instruments can only detect the amplitude while can’t acquire the width information. This paper proposed a novel wrist pulse signal acquisition system, which could realize simultaneous measurements of the width and amplitude of dynamic pulse waves under different static forces. A tailor-packaged micro-electro-mechanical system (MEMS) sensor array was employed to collect pulse signals, a conditioning circuit was designed to process the signals, and a customized algorithm was developed to compute the width. Experiments were carried out to validate the accuracy of the sensor array and system effectiveness. The results showed the system could acquire not only the amplitude of pulse wave but also the width of it. The system provided more information about pulse waves, which could help doctors make the diagnosis.

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