Design of a new vibration sensor for low frequency vibration measurement of large structure

2015 ◽  
Author(s):  
Yuanxun Qin ◽  
Guanrong Pei ◽  
Rui Wang ◽  
Hongtai He ◽  
Zhiguang Guo
Keyword(s):  
Low Frequency ◽  
Vibration Sensor ◽  
Vibration Measurement ◽  
Large Structure ◽  
Low Frequency Vibration

Low-Frequency Vibration Measurement Based on Spatiotemporal Analysis of Shadow Moiré

2011 ◽  
Vol 31 (4) ◽  
pp. 0412005
Author(s):  
史红健 Shi Hongjian ◽  
朱飞鹏 Zhu Feipeng ◽  
何小元 He Xiaoyuan
Keyword(s):  
Low Frequency ◽  
Spatiotemporal Analysis ◽  
Vibration Measurement ◽  
Shadow Moire ◽  
Shadow Moiré ◽  
Low Frequency Vibration

scholarly journals Low-Frequency Vibration Sensor with a Sub-nm Sensitivity Using a Bidomain Lithium Niobate Crystal

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 614 ◽  
Author(s):  
Ilya Kubasov ◽  
Aleksandr Kislyuk ◽  
Andrei Turutin ◽  
Alexander Bykov ◽  
Dmitry Kiselev ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Excitation Frequency ◽  
Low Frequency ◽  
Vibration Sensor ◽  
Gravitational Acceleration ◽  
Frequency Sensor ◽  
Linear Behavior ◽  
Low Frequency Vibration ◽  
Acceleration Amplitude ◽  
Vibrational Excitations

We present a low-frequency sensor for the detection of vibrations, with a sub-nm amplitude, based on a cantilever made of a single-crystalline lithium niobate (LiNbO3) plate, with a bidomain ferroelectric structure. The sensitivity of the sensor-to-sinusoidal vibrational excitations was measured in terms of displacement as well as of acceleration amplitude. We show a linear behavior of the response, with the vibrational displacement amplitude in the entire studied frequency range up to 150 Hz. The sensitivity of the developed sensor varies from minimum values of 20 μV/nm and 7 V/g (where g = 9.81 m/s2 is the gravitational acceleration), at a frequency of 23 Hz, to peak values of 92.5 mV/nm and 2443 V/g, at the mechanical resonance of the cantilever at 97.25 Hz. The smallest detectable vibration depended on the excitation frequency and varied from 100 nm, at 7 Hz, to 0.1 nm, at frequencies above 38 Hz. Sensors using bidomain lithium niobate single crystals, as sensitive elements, are promising for the detection of ultra-weak low-frequency vibrations in a wide temperature range and in harsh environments.

scholarly journals Low-frequency vibration measurement by a dual-frequency DBR fiber laser

2017 ◽  
Vol 7 (3) ◽  
pp. 206-210 ◽  
Author(s):  
Bing Zhang ◽  
Linghao Cheng ◽  
Yizhi Liang ◽  
Long Jin ◽  
Tuan Guo ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Low Frequency ◽  
Vibration Measurement ◽  
Dual Frequency ◽  
Low Frequency Vibration

Low-frequency vibration measurement based on the concentric-circle grating projection system

2021 ◽  
pp. 1-1
Author(s):  
Chengang Lyu ◽  
Xuekai Wang ◽  
Yage Liu ◽  
Hongchen Liu ◽  
Chunfeng Ge ◽  
...  
Keyword(s):  
Low Frequency ◽  
Concentric Circle ◽  
Vibration Measurement ◽  
Projection System ◽  
Low Frequency Vibration

scholarly journals Development of a High-Sensitivity Optical Accelerometer for Low-Frequency Vibration Measurement

Sensors ◽  
2018 ◽  
Vol 18 (9) ◽  
pp. 2910 ◽  
Author(s):  
Rui-Jun Li ◽  
Ying-Jun Lei ◽  
Zhen-Xin Chang ◽  
Lian-Sheng Zhang ◽  
Kuang-Chao Fan
Keyword(s):  
Passive Control ◽  
Low Cost ◽  
Low Frequency ◽  
High Sensitivity ◽  
Dynamic Responses ◽  
Vibration Measurement ◽  
Leaf Spring ◽  
Seismic Mass ◽  
Low Frequency Vibration ◽  
Low Amplitude

Low-frequency vibration is a harmful factor that affects the accuracy of micro/nano-measuring machines. Low-frequency vibration cannot be completely eliminated by passive control methods, such as the use of air-floating platforms. Therefore, low-frequency vibrations must be measured before being actively suppressed. In this study, the design of a low-cost high-sensitivity optical accelerometer is proposed. This optical accelerometer mainly comprises three components: a seismic mass, a leaf spring, and a sensing component based on a four-quadrant photodetector (QPD). When a vibration is detected, the seismic mass moves up and down due to the effect of inertia, and the leaf spring exhibits a corresponding elastic deformation, which is amplified by using an optical lever and measured by the QPD. Then, the acceleration can be calculated. The resonant frequencies and elastic coefficients of various seismic structures are simulated to attain the optimal detection of low-frequency, low-amplitude vibration. The accelerometer is calibrated using a homemade vibration calibration system, and the calibration experimental results demonstrate that the sensitivity of the optical accelerometer is 1.74 V (m·s−2)−1, the measurement range of the accelerometer is 0.003–7.29 m·s−2, and the operating frequencies range of 0.4–12 Hz. The standard deviation from ten measurements is under 7.9 × 10−4 m·s−2. The efficacy of the optical accelerometer in measuring low-frequency, low-amplitude dynamic responses is verified.

Research on the Performance of Cantilever Low Frequency Vibration Sensor Based on Thin-diameter Excessively Tilted Fiber Grating

2020 ◽  
Vol 49 (12) ◽  
pp. 42-50
Author(s):  
邹雪 Xue ZOU ◽  
邓欧 Ou DENG ◽  
罗彬彬 Bin-bin LUO ◽  
吴德操 De-cao WU ◽  
赵明富 Ming-fu ZHAO ◽  
...  
Keyword(s):  
Low Frequency ◽  
Vibration Sensor ◽  
Fiber Grating ◽  
Low Frequency Vibration

Fiber Bragg Grating Accelerometer Based on L-Shaped Rigid Beam and Elastic Diaphragm for Low-Frequency Vibration Measurement

2015 ◽  
Vol 35 (12) ◽  
pp. 1206005 ◽  
Author(s):  
曾宇杰 Zeng Yujie ◽  
王俊 Wang Jun ◽  
杨华勇 Yang Huayong ◽  
马丽娜 Ma Lina
Keyword(s):  
Fiber Bragg Grating ◽  
Low Frequency ◽  
Vibration Measurement ◽  
Bragg Grating ◽  
Low Frequency Vibration

An Ultra-Low Frequency Vibration Sensor Realized by Using the Magnetoelectric Speed Sensor

2013 ◽  
Vol 278-280 ◽  
pp. 704-708 ◽  
Author(s):  
Zhang Yi Yuan ◽  
Ke Dong ◽  
Yu Xia Qian
Keyword(s):  
Function Theory ◽  
Low Frequency ◽  
Vibration Sensor ◽  
Speed Sensor ◽  
Frequency Sensor ◽  
Low Frequency Vibration ◽  
Before And After ◽  
The Difference ◽  
Output Characteristics ◽  
Physical Phenomena

Ultra-low frequency vibrations are ordinary physical phenomena, and absolute vibrant sensors are usually used to detect them. The author presents a method that using magnetoelectric speed sensor to detect ultra-low frequency vibrations. With cascade correcting circuit, the lowest frequency that can be measured will be less than 0.5Hz while the best damping is maintained. The author has systematically analyzed the correcting circuit, transfer function, theory of operation, and the difference between output characteristics before and after correcting to the ultra-low frequency sensor.

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