A Z-Axis Decoupled Micromachined Gyroscope with Dual Frames

2011 ◽  
Vol 483 ◽  
pp. 169-173
Author(s):  
Hai Lin Tang ◽  
Xian Xue Liu ◽  
Hao Zhou
Keyword(s):  
Quality Factor ◽  
Test Results ◽  
Dual Frames ◽  
Fabrication Errors ◽  
Micromachined Gyroscope

A z-axis decoupled micromachined gyroscope with dual frames is designed, fabricated and tested. The robust structure considering fabrication errors is obtained by the use of optimal robustness of design and process compensation. The gyroscope is packaged in vacuum, and test results show that quality factor of driving and sensing modes are 2000 and 800, respectively. In the range of 0~2400 deg/sec, sensitivity and linearity of the fabricated gyroscope are 1 deg/sec and 0.3%, respectively.

Analysis of Temperature Effects on a Fully-Symmetrical Micromachined Gyroscope

2009 ◽  
Vol 60-61 ◽  
pp. 31-35
Author(s):  
Wei Ping Chen ◽  
Yu Gang Guo ◽  
Xiao Liang Chen ◽  
Hong Chen ◽  
Zhen Gang Zhao
Keyword(s):  
Thermal Expansion ◽  
Temperature Effects ◽  
Test Results ◽  
Resonant Frequencies ◽  
Resonance Frequencies ◽  
Environment Temperature ◽  
Good Accordance ◽  
Simulation Results ◽  
Effects Of Temperature ◽  
Micromachined Gyroscope

This paper researches on the temperature effects of a fully-symmetrical micromachined gyroscope. The Young’s modulus and thermal expansion coefficient of silicon vary with the environment temperature, which affects the modes’ resonant frequencies of micromachined gyroscopes. The effects of temperature fluctuation on the modes’ resonant frequencies is simulated by the FEM software ANSYS. The simulation results show that the fully-symmetrical gyroscope’s resonance frequencies decrease with the increase of temperature and the decrease degree nearly 0.256Hz/°C, but the two modes’ resonance frequencies matches well. The micromachined gyroscope’s dynamic characteristics are tested. The resonant frequencies and the quality factor are reduced with the increase of temperature and the decrease degree of the fit linear about the resonant frequencies is 0.276 Hz/°C. The test results are in good accordance with the simulation results.

Temperature characteristics of quality factor of silicon micromachined gyroscope under high-vacuum environment

2015 ◽  
Vol 23 (7) ◽  
pp. 1990-1995
Author(s):  
姜劭栋 JIANG Shao-dong ◽  
苏岩 SU Yan ◽  
裘安萍 QIU An-ping ◽  
施芹 SHI Qin
Keyword(s):  
Quality Factor ◽  
High Vacuum ◽  
Temperature Characteristics ◽  
Micromachined Gyroscope ◽  
High Vacuum Environment

Closed-Loop Driving Circuit Based on Frequency Modulation Method for Capacitive Micromachined Gyroscope

2012 ◽  
Vol 503 ◽  
pp. 179-182
Author(s):  
Bing Mo ◽  
Qi Zheng ◽  
Si Hao Chen ◽  
Huo Zhou ◽  
Chao Dong Ling
Keyword(s):  
Frequency Modulation ◽  
High Performance ◽  
Closed Loop ◽  
Modulation Method ◽  
Test Results ◽  
Micromachined Gyroscope ◽  
Driving Circuit ◽  
Driving Signal

Closed-loop driving circuit is widely used in the high performance micrimachined gyroscope. But in the capacitive micromachined gyroscope, this circuit can be self-oscillation incapability because of signal coupling by parasitical capacitance. A novel closed-loop driving circuit based on the frequency modulation method is present in this paper. Since the frequency of driving signal is modulated, it is different from the frequency of sensing current. Even if there is coupling, the phase requirement of closed-loop driving method is not destroyed, which overcomes the disadvantage of self-oscillation incapability. Both the simulations and test results are provided, which demonstrates the feasibility of this method.

Comparison of Photoacoustic Behaviors between Helmholtz Cell and its Remodified One

2013 ◽  
Vol 804 ◽  
pp. 251-255
Author(s):  
Jun Juan Zhao ◽  
Xian Hui Li ◽  
Wei Zhang ◽  
Zhan Zhao
Keyword(s):  
Resonant Frequency ◽  
Quality Factor ◽  
Optical Power ◽  
Photoacoustic Signal ◽  
Time Measurement ◽  
Test Results ◽  
Signal To Noise ◽  
Real Time Measurement ◽  
On Line ◽  
And Performance

This paper presents method and performance of the Helmholtz photoacoustic resonant cell and its remodified one which both were designed and tested respectively based on the measurement of the CO2 contribution of the photoacoustic signal in experiments. The average optical power at the laser operating point was 800mW for the10.653um laser (CO2 detection). On-line and real time measurement CO2/N2 mixtures (CO2 300ppm) were then performed. The Helmholtz photoacoustic resonant cell and its remodified one test of the carbodioxide conducted at their respective resonant frequency demonstrated signals about 43mV and 67mV, signal-to-noise (S/N) values about 47dB and 51dB respectively. According to test results, the remodified one also has a better quality factor. All this demonstrate the remodified Helmholtz cell can preferably improve excitation of acoustical signal.

Research and Test of the Digital Phase Locked Loop Drive Technology for Silicon Micro-Machined Gyroscope

2011 ◽  
Vol 403-408 ◽  
pp. 4252-4259
Author(s):  
Yu Liang Wang ◽  
Shuang Wei Han ◽  
Hong Sheng Li ◽  
Hao Liu
Keyword(s):  
Quality Factor ◽  
Closed Loop ◽  
Phase Locked Loop ◽  
Frequency Stability ◽  
Test Results ◽  
Drive Mode ◽  
Analog To Digital ◽  
Digital Phase ◽  
Field Programmable ◽  
Drive Circuit

A program of digital phase locked loop (DPLL) drive is proposed to supply the gaps including debugging complex, easiness of interference and poor flexibility in the traditional analog drive loop of the silicon micro-machined gyroscope (SMG). The program, i.e. field programmable gate array (FPGA) is utilized to process the drive sensitive signal of the SMG after the analog to digital (A/D) processing of high-precision, has been utilized to achieve phase and amplitude closed-loop of the SMG’s drive mode. The simulation and test results show that the program has a great advantage to reduce the requirements on quality factor compared with the original program. When the gyroscope with a low quality factor is not easy to vibrate by the analog self-excited drive circuit, the program is adopted to reach drive mode’s frequency stability of 18ppm.

scholarly journals Rancang Bangun Dan Pengujian Kualitas Aplikasi Web E-Recruitment Berdasarkan ISO/IEC 9126 Pada Suatu Perusahaan Pembiayaan Di Indonesia

2021 ◽  
Vol 6 (1) ◽  
pp. 20
Author(s):  
Dedi Iskandar ◽  
Dina Indarti
Keyword(s):  
Quality Factor ◽  
Web Application ◽  
Web Applications ◽  
Efficiency Factor ◽  
Web Browsers ◽  
Test Results ◽  
Reliability Factor ◽  
Quality Testing ◽  
Black Box Testing

This research aims to design, create, and test the quality of e-recruitment web applications at a financing company in Indonesia based on ISO/IEC 9126. Methods used in this study are Research and Development (R&D) including potential identification and problems, analysis and data collection, application design, implementation, application validation, application revision, and application trials. E-Recruitment web application was created using LAMP (Linux, Apache, MySQL, PHP). Application quality testing based on 6 factors namely functionality, reliability, efficiency, usability, maintainability, and portability. Functionality factor was tested using black box testing. The efficiency factor was tested using GT Metrix (Yslow) and PageSpeed Insight. The reliability factor was tested using stress testing (LoadStrom, LoadImpact, and WAPT 8.1). The maintainability factor was tested based on instrumentation, consistency, and simplicity aspects. The portability factor was tested using multiple web browsers, and usability factor using Computer System Usability Questionnaire. Based on the results of the research that has been done, e-recruitment web application is able to run well with some revisions from recruitment experts and programming experts. Application test results based on ISO/IEC 9126 have met the application quality factor standards of functionality, reliability, usability, maintainability, and portability. The efficiency factor still do not meet the application quality factor standards.

Field Tests and In-Service Monitoring of Newburgh-Beacon Bridge, New York

2003 ◽  
Vol 1845 (1) ◽  
pp. 163-170 ◽  
Author(s):  
Harry W. Shenton ◽  
Michael J. Chajes ◽  
Bala Sivakumar ◽  
William W. Finch
Keyword(s):  
New York ◽  
New York State ◽  
Field Tests ◽  
Test Results ◽  
Fabrication Errors ◽  
Short And Long Term ◽  
Truss Bridge ◽  
Very High ◽  
Term Field

Field tests previously conducted on the Newburgh–Beacon Bridge in New York captured anomalous stress spikes in the critical hangers of the truss bridge. The very high magnitude spikes occurred sporadically, without warning and under various conditions. The cause and nature of the spikes were of great concern to the bridge owner, the New York State Bridge Authority. Originally, the spikes were thought to be due to some combination of wind, thermal effects, and an unlocking of stresses due to fabrication errors in the pin-and-hangers systems. A series of short- and long-term field tests were recently conducted on the bridge to help identify the cause of the spikes. Sections of the bridge were instrumented with strain gauges around two different pin-and-hanger members. One site was continuously monitored for over 3 months to obtain statistical data on the spikes. Through a series of different test setups, designed to debug the problem, the anomalous spikes were found to be caused by radio interference in the environment, which was being picked up by the strain gauge wires. The test setup, test program, and test results are described. The tests resolved a long-standing concern of the bridge authority and avoided costly and unnecessary retrofits.

scholarly journals Development and Vertical Tests of CEPC 650-MHz Single-Cell Cavities with High Gradient

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7654
Author(s):  
Song Jin ◽  
Peng Sha ◽  
Weimin Pan ◽  
Jiyuan Zhai ◽  
Zhenghui Mi ◽  
...  
Keyword(s):  
Single Cell ◽  
Quality Factor ◽  
State Of The Art ◽  
Test Results ◽  
Fine Grain ◽  
Electron Positron ◽  
Superconducting Cavities ◽  
Intrinsic Quality ◽  
Quality Factor Q ◽  
Vertical Test

A circular electron positron collider (CEPC) will adopt hundreds of 650-MHz superconducting cavities with high quality factor (Q) and accelerating gradient (Eacc). Two 650-MHz single-cell cavities made of fine-grain niobium were first treated via buffered chemical polishing (BCP), which was easy and convenient. However, the vertical test results could not meet the specification of the CEPC (4 × 1010 at 22 MV/m). Therefore, electro-polishing (EP) of 650-MHz single-cell cavities was conducted, which was complicated but remarkably effective. Both 650-MHz single-cell cavities achieved state-of-the-art gradients of 35 MV/m after the EP process, which is extremely high for large elliptical cavities (frequency < 1 GHz). One cavity achieved an intrinsic quality factor (Q0) of 4.5 × 1010 at 22.0 MV/m, which was higher than the CEPC spec. The other cavity obtained a lower Q0 of 3.4 × 1010 at 22.0 MV/m, which may have resulted from the cancellation of high-temperature annealing.

Using Conventional Articulation Tests With Highly Unintelligible Children

1992 ◽  
Vol 23 (1) ◽  
pp. 52-60 ◽  
Author(s):  
Pamela G. Garn-Nunn ◽  
Vicki Martin
Keyword(s):  
Test Results ◽  
Phonological Processes ◽  
Rule Based ◽  
Severity Level ◽  
Error Sensitivity ◽  
Conventional Tests ◽  
Severity Levels ◽  
Conventional Test ◽  
Impaired Children

This study explored whether or not standard administration and scoring of conventional articulation tests accurately identified children as phonologically disordered and whether or not information from these tests established severity level and programming needs. Results of standard scoring procedures from the Assessment of Phonological Processes-Revised, the Goldman-Fristoe Test of Articulation, the Photo Articulation Test, and the Weiss Comprehensive Articulation Test were compared for 20 phonologically impaired children. All tests identified the children as phonologically delayed/disordered, but the conventional tests failed to clearly and consistently differentiate varying severity levels. Conventional test results also showed limitations in error sensitivity, ease of computation for scoring procedures, and implications for remediation programming. The use of some type of rule-based analysis for phonologically impaired children is highly recommended.

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