Optical Vibration and Acceleration Sensor With a Silicon Cantilever

1999 ◽  
Author(s):  
Mitsuteru Kimura ◽  
Katsuhisa Toshima ◽  
Harunobu Satoh
Keyword(s):  
Simple Model ◽  
Optical Fiber ◽  
Resonance Frequency ◽  
Acceleration Sensor ◽  
Frequency Range ◽  
Silicon Cantilever ◽  
All Optical ◽  
New Type ◽  
Good Agreement ◽  
Optical Vibration

Abstract A new type all optical vibration and acceleration sensor using the combination of micromachined Si cantilever and optical fiber is proposed, and its fundamental characteristics are demonstrated. The light emitted from bulb-lens set into the V-groove is reflected at the reflector formed on the Si cantilever and then recoupled into the bulb-lens. Several sensors with different length (0.64–6.0 mm long) of the Si cantilever are fabricated to compare the theoretical resonance frequency fr obtained from the simple model and experimental ones. They had good agreement. From the sensing principle the sensing frequency range of the vibration is suitable below the fr of the Si cantilever of the sensor.

Numerical Analysis and Optimal Design of All-Optical Fiber Differential Acceleration Sensor

2020 ◽  
Vol 18 (1) ◽  
pp. 12-17
Author(s):  
Ya-Lin Li ◽  
Xiao-Guang Cui ◽  
Xiao-Yong Fang
Keyword(s):  
Optical Fiber ◽  
Structural Parameters ◽  
Center Of Mass ◽  
Relative Sensitivity ◽  
Optical Signal ◽  
Acceleration Sensor ◽  
Optical Signals ◽  
Fiber Technology ◽  
All Optical ◽  
The Difference

In order to improve the sensitivity of measurement and realize its miniaturization, an all-optical fiber differential acceleration sensor is studied. This sensor adopts a novel four-port ring fiber coupler, which can realizes the difference of optical signals and the isolation of light source and optical signal. Therefore, the sensitivity of this sensor is doubled compared with that of traditional fiber sensors. The stress–strain relationship simulation results of the sensor probe model show that with the increase of the measured acceleration value, the relative sensitivity, relative resolution, and relative error of the sensor all decrease. In the structural parameters of the probe-sensitive unit, the film thickness has the greatest influence on the performance of the sensor. The radius of the diaphragm 65 μm, a thickness of 2 μm, taking the thickness of the center of mass 20 μm, the mass 20 μm taken radius conditions, sensitivity of this fiber acceleration sensor is not less than 0.0025 m–1 · s2, less than 2% error, the linear measuring range of 0 to 2800 m · s–2. This design combines microelectronics and optical fiber technology, which can more easily realize the miniaturization and multi-function of acceleration sensor.

scholarly journals INVESTIGATION OF THREE-POLE OSCILLATION CIRCUIT

2010 ◽  
Vol 2 (1) ◽  
pp. 63-67
Author(s):  
Narimantas Kutka ◽  
Saulius Goceikis
Keyword(s):  
Electromagnetic Wave ◽  
Resonance Frequency ◽  
Wave Frequency ◽  
Radio Waves ◽  
Frequency Range ◽  
New Approach ◽  
Special Construction ◽  
Oscillation Circuit ◽  
Calculation Methodology ◽  
New Type

New approach of three-pole electromagnetic wave systems and three-pole resonance is reviewed and new effects are described. With special construction three-pole oscillation circuit are formed superpositional new type electromagnetic wave with new properties. The aim is to that multi-pole oscillation circuit can enter into resonance which my not match any two-pole resonance frequency and thereby shape the new three-pole electromagnetic wave frequency range, i.e. could potentially extend the range of radio waves. The article describes the basics of three-pole mathematics, application aspects, and, using this math, three-pole calculation methodology.

The working standard of the unit of power of electromagnetic waves in the frequency range from 37,5 to 220 GHz

2020 ◽  
pp. 53-58
Author(s):  
A. V. Koudelny ◽  
I. M. Malay ◽  
V. A. Perepelkin ◽  
I. P. Chirkov
Keyword(s):  
Microwave Power ◽  
Electromagnetic Waves ◽  
Primary Standard ◽  
The State ◽  
Frequency Range ◽  
Working Standard ◽  
Extended Frequency Range ◽  
Effective Efficiency ◽  
Extended Frequency ◽  
Good Agreement

The possibility of using bolometric converters of microwave power from the State primary standard of the unit of power of electromagnetic waves in waveguide and coaxial paths GET 167-2017, which has a frequency range from 37,5 to 78,33 GHz, in an extended frequency range up to 220 GHz, is shown. Studies of semiconductor bolometric converters of microwave power in an extended frequency range have confirmed good agreement and smooth frequency characteristics of the effective efficiency factor of the converters. Based on the research results, the State working standard of the unit of power of electromagnetic waves of 0,1–10 mW in the frequency range from 37,5 to 220 GHz 3.1.ZZT.0288.2018 was approved. The technical characteristics of the working standard of the unit of power of electromagnetic oscillations in an extended frequency range from 37,5 to 220 GHz are given.

Theoretical and experimental research on slip and uplift of the timber-concrete composite beam

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 7079-7099
Author(s):  
Jianying Chen ◽  
Guojing He ◽  
Xiaodong (Alice) Wang ◽  
Jiejun Wang ◽  
Jin Yi ◽  
...  
Keyword(s):  
Differential Equations ◽  
Deformation Theory ◽  
Concrete Slab ◽  
Theoretical Calculations ◽  
Structural Element ◽  
Structural Efficiency ◽  
Theoretical Investigations ◽  
New Type ◽  
Interlayer Slip ◽  
Good Agreement

Timber-concrete composite beams are a new type of structural element that is environmentally friendly. The structural efficiency of this kind of beam highly depends on the stiffness of the interlayer connection. The structural efficiency of the composite was evaluated by experimental and theoretical investigations performed on the relative horizontal slip and vertical uplift along the interlayer between composite’s timber and concrete slab. Differential equations were established based on a theoretical analysis of combination effects of interlayer slip and vertical uplift, by using deformation theory of elastics. Subsequently, the differential equations were solved and the magnitude of uplift force at the interlayer was obtained. It was concluded that the theoretical calculations were in good agreement with the results of experimentation.

All optical fiber mode selective coupler based on non-weak guided fiber

2021 ◽  
Author(s):  
Lianzhen Zhang ◽  
Xuejing Liu ◽  
qianbo wang ◽  
na yang ◽  
jun zhou ◽  
...  
Keyword(s):  
Optical Fiber ◽  
All Optical ◽  
Fiber Mode

All-optically-driven and All-optical-fiber Vacuum Gauge via Ytterbium-doped Optical Fiber Microheater

2021 ◽  
Author(s):  
Nanjie Yu ◽  
Andrey E. Mironov ◽  
Sehyun Park ◽  
Matthew Tuggle ◽  
Jane Gragg ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Vacuum Gauge ◽  
All Optical

Hypersonic Velocity, Absorption and Relaxation in Molten CSNO3

1977 ◽  
Vol 32 (1) ◽  
pp. 57-60 ◽  
Author(s):  
H. E. Gunilla Knape ◽  
Lena M. Torell
Keyword(s):  
Relaxation Time ◽  
High Frequency ◽  
Viscosity Coefficient ◽  
Sound Waves ◽  
Frequency Range ◽  
Ultrasonic Velocities ◽  
Hypersonic Velocity ◽  
Frequency Shifts ◽  
Bulk Viscosity Coefficient ◽  
Good Agreement

Abstract Brillouin spectra of molten CSNO3 were investigated for scattering angles between 40 and 140° and in a temperature interval of 420-520 °C. An Ar+ singlemode laser was used for excitation and the total instrumental width was ~265 MHz. The measured frequency shifts and linewidths of the Brillouin components were used to determine velocities and attenuations of thermal sound waves in the frequency range 2.3-7.0 GHz. A dispersion of 4-5% was found between the present hyper­ sonic velocities and reported ultrasonic velocities. A considerable decrease in attenuation with frequency was observed in the investigated frequency range, with the value at high frequency ap­ proaching the classical attenuation. The results are in good agreement with Mountain's theory of a single relaxation time. The relaxation time of the bulk viscosity coefficient was calculated to 1.2×10-10S.

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