Theory and experiment research for ultra-low frequency maglev vibration sensor

2015 ◽  
Vol 86 (10) ◽  
pp. 105001 ◽  
Author(s):  
Dezhi Zheng ◽  
Yixuan Liu ◽  
Zhanshe Guo ◽  
Xiaomeng Zhao ◽  
Shangchun Fan
Keyword(s):  
Low Frequency ◽  
Vibration Sensor ◽  
Experiment Research ◽  
Theory And Experiment

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.

Theoretical far‐field radiation from a low‐frequency horizontal acoustic point force in a vertical borehole

Geophysics ◽  
1986 ◽  
Vol 51 (4) ◽  
pp. 930-939 ◽  
Author(s):  
Andrew L. Kurkjian
Keyword(s):  
Body Force ◽  
Low Frequency ◽  
Vibration Sensor ◽  
Point Force ◽  
Small Radius ◽  
Seismic Sources ◽  
Low Frequencies ◽  
Field Radiation ◽  
Point Body ◽  
Vertical Borehole

A subsurface point body force can be realized using a body force on the axis of a small‐radius borehole drilled perpendicular to the force. This observation, originally made by Kitsunezaki (1980), is having a significant impact in shear‐wave logging, and may potentially affect downhole seismic sources. Applying the principle of reciprocity to this finding, a horizontal vibration sensor on the axis of a vertical hole will be unaffected by the existence of the hole at low frequencies. Numerical methods determine both the frequency below which, and the offset beyond which, borehole‐related effects are negligible. If the shear wavelength is greater than ten times the diameter of the hole and if the measurement is made at least one shear wavelength from the point force, then the borehole effects will be minimal.

The low frequency 2D vibration sensor based on flat coil element

2012 ◽  
Author(s):  
Mitra Djamal ◽  
Edi Sanjaya ◽  
Islahudin ◽  
Ramli
Keyword(s):  
Low Frequency ◽  
Vibration Sensor ◽  
Coil Element
Sign in / Sign up

Export Citation Format

Share Document