Modeling of I-, T- and V-Shaped Microcantilevers for Environmental Monitoring

2013 ◽  
Vol 737 ◽  
pp. 119-125 ◽  
Author(s):  
Ratno Nuryadi
Keyword(s):  
Environmental Monitoring ◽  
Effective Mass ◽  
Spring Constant ◽  
Dynamic Mode ◽  
Sensor Sensitivity ◽  
Resonance Frequencies ◽  
Simulation Results

This paper describes a model of microcantilever to determine the optimal dimensions that can be used for environmental monitoring. Three types, which are usually used i.e., I-, T- and V-shaped microcantilevers, are considered. The microcantilevers work in dynamic mode in which their resonance frequencies depend on both spring constant and effective mass. It can be seen that the spring constant and effective mass of the microcantilever change when the structure is changed even the size is same. In consequent, the sensor sensitivity is also found to be different each other. The V-shaped microcantilever is more sensitive than I- and T-shaped ones. Moreover, the simulation results show that the microcantilever with sizes of length 10 µm, width 5 µm and thickness 100 nm is good enough to detect molecule gas with the mass of less than femtogram.

Resonance Frequency Change in Microcantilever-Based Sensor due to Humidity Variation

2013 ◽  
Vol 737 ◽  
pp. 176-182 ◽  
Author(s):  
Ratno Nuryadi ◽  
Arko Djajadi ◽  
Reyhan Adiel ◽  
Lia Aprilia ◽  
Nuning Aisah
Keyword(s):  
Environmental Monitoring ◽  
Resonance Frequency ◽  
Rapid Detection ◽  
High Sensitivity ◽  
Spring Constant ◽  
Dynamic Mode ◽  
Frequency Change ◽  
The Many

Microcantilever-based sensors have attracted interest in the last decade because of their small size, rapid detection and high sensitivity. This sensor can be applied in the many fields, i.e. physics, chemistry, biology, biochemistry, medical, and environment. In this paper, we describe microcantilever-based sensor for environmental monitoring, especially for a humidity detection. This sensor was operated in dynamic mode where a change in mass or spring constant of the microcantilever provides the resonance frequency change. Here, a change of humidity is detected by the resonance frequency and the amplitude changes. It is found that the increase in the humidity causes the decreasing the resonance frequency but increasing the amplitude. This result opens up the possibility of the humidity detection using microcantilever-based sensor.

scholarly journals Efficiency improvement in the cantilever photothermal excitation method using a photothermal conversion layer

2016 ◽  
Vol 7 ◽  
pp. 409-417 ◽  
Author(s):  
Natsumi Inada ◽  
Hitoshi Asakawa ◽  
Taiki Kobayashi ◽  
Takeshi Fukuma
Keyword(s):  
Saline Solution ◽  
Spring Constant ◽  
Dynamic Mode ◽  
Efficiency Improvement ◽  
Colloidal Graphite ◽  
Photothermal Conversion ◽  
Excitation Efficiency ◽  
Afm Imaging ◽  
Fixed End ◽  
Excitation Method

Photothermal excitation is a cantilever excitation method that enables stable and accurate operation for dynamic-mode AFM measurements. However, the low excitation efficiency of the method has often limited its application in practical studies. In this study, we propose a method for improving the photothermal excitation efficiency by coating cantilever backside surface near its fixed end with colloidal graphite as a photothermal conversion (PTC) layer. The excitation efficiency for a standard cantilever of PPP-NCHAuD with a spring constant of ≈40 N/m and a relatively stiff cantilever of AC55 with a spring constant of ≈140 N/m were improved by 6.1 times and 2.5 times, respectively, by coating with a PTC layer. We experimentally demonstrate high stability of the PTC layer in liquid by AFM imaging of a mica surface with atomic resolution in phosphate buffer saline solution for more than 2 h without any indication of possible contamination from the coating. The proposed method, using a PTC layer made of colloidal graphite, greatly enhances photothermal excitation efficiency even for a relatively stiff cantilever in liquid.

Optimization of a Novel Micro-Hotplate for Gas Sensor

2013 ◽  
Vol 423-426 ◽  
pp. 2317-2320
Author(s):  
Chang Chun Li ◽  
Xiao Bo Zhang ◽  
Li Liu
Keyword(s):  
Temperature Distribution ◽  
Gas Sensor ◽  
Uniform Temperature ◽  
Si Substrate ◽  
Uniform Temperature Distribution ◽  
Sensor Sensitivity ◽  
Electrode Space ◽  
Higher Temperature ◽  
Simulation Results ◽  
Novel Design

A novel design of micro-hotplate is proposed for micro-structural gas sensor. The simulation results of ANSYS reveal that higher temperature and more uniform temperature distribution was achieved in the micro-hotplate when the thickness of SiO2, thickness of Si substrate, electrode width and electrode space were designed to be 100, 200, 20 and 230 μm, respectively. The new micro-hotplate is benefit for the improvement of sensor sensitivity.

Impact of effective mass changes with mole-fraction on the analog/radio frequency benchmarking parameters in junctionless GaxIn1−xAs/GaAs field-effect transistor

2021 ◽  
pp. 2150238
Author(s):  
Mahdi Vadizadeh ◽  
Mohammad Fallahnejad
Keyword(s):  
Radio Frequency ◽  
Effective Mass ◽  
Mole Fraction ◽  
High Frequency ◽  
Cutoff Frequency ◽  
Frequency Noise ◽  
Noise Performance ◽  
High Frequency Noise ◽  
Gaas Structure ◽  
Simulation Results

In this paper, for the first time, changes in the effective mass (EM) of electron and hole with mole fraction are taken into account for extracting the benchmarking parameters of analog/radio frequency (RF) and high-frequency noise performance of junctionless (JL)-Ga[Formula: see text]In[Formula: see text]As/GaAs via simulation. In the JL-Ga[Formula: see text]In[Formula: see text]As/GaAs structure, considering changes in the effective mass with mole fraction is called a with-EM state, while the JL-Ga[Formula: see text]In[Formula: see text]As/GaAs structure without considering the changes in effective mass with mole fraction is called a without-EM state. The simulation results show that, per [Formula: see text], the maximum transconductance in the with-effective mass (EM) state is [Formula: see text] mS/[Formula: see text]m, which is reduced by 8% compared to the without-EM state. The JL-Ga[Formula: see text]In[Formula: see text]As/GaAs device in the with-EM state has the unity gain cutoff frequency of [Formula: see text] GHz, minimum noise figure of [Formula: see text] db, and available associated gain of [Formula: see text] db. The [Formula: see text] and [Formula: see text] parameters in the with-EM state decreased by 10% and 38%, respectively, compared to the without-EM state. Moreover, [Formula: see text] in the with-EM state increased by 65% compared to the without-EM state. Our simulation results indicated that an increase in electron effective mass with the increased [Formula: see text] can limit the analog/RF frequency and high-frequency noise performance of the JL-Ga[Formula: see text]In[Formula: see text]As/GaAs device.

Finding the Effective Mass and Spring Constant of a Force Probe from Simple Harmonic Motion

2016 ◽  
Vol 54 (3) ◽  
pp. 138-141 ◽  
Author(s):  
Nathaniel R. Greene ◽  
Tom Gill ◽  
Stephen Eyerly
Keyword(s):  
Effective Mass ◽  
Spring Constant ◽  
Harmonic Motion ◽  
Simple Harmonic Motion

Development of an Ultrasonic-Vibration Microforming Apparatus

2011 ◽  
Vol 189-193 ◽  
pp. 4092-4096 ◽  
Author(s):  
Jung Chung Hung ◽  
Ching Shyong Shieh
Keyword(s):  
Ultrasonic Vibration ◽  
Force Control ◽  
Closed Loop ◽  
Laser Interferometer ◽  
Load Capacity ◽  
Control Program ◽  
Integrated System ◽  
Resonance Frequencies ◽  
Micro Parts ◽  
Simulation Results

This study attempted to design and develop an integrated system of a microforming apparatus with ultrasonic-vibration device. A closed-loop displacement and force control was implemented with servo motors. The apparatus has a load capacity up to 10,000N. The displacement error curve of the platform was measured with API 5DLS laser interferometer, and fed into the control program to compensate for motion errors. The positioning precision of the platform has been upgraded up to 5μm, with a load accuracy of 0.5N. Taking advantage of FEA and optimization technology, boosters and resonator with 35 kHz frequency were designed and fabricated. The simulation results and the experimental results match perfectly on the account of resonance frequencies and amplitudes. To the end, the integration of the ultrasonic-vibration device with microforming platform demonstrates a precision process for micro-parts.

scholarly journals A Miniaturized Meandered Dipole UHF RFID Tag Antenna for Flexible Application

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Xiuwei Xuan ◽  
Lianrong Lv ◽  
Kun Li
Keyword(s):  
Large Scale ◽  
Experimental Studies ◽  
Dipole Antenna ◽  
Threshold Power ◽  
Uhf Rfid ◽  
Minimum Threshold ◽  
Rfid Tag ◽  
Resonance Frequencies ◽  
Simulation Results ◽  
Flexible Application

A miniaturized meandered dipole antenna for UHF RFID tag is proposed. Different resonance frequencies and impedance can be achieved by adjusting the number of the meanders, which can help to reduce the size of the antenna. Due to the radiation patches, the input impedance of the antenna can be flexibly tuned in a large scale. The proposed antenna is printed on polyethylene (PET) substrate with a total volume of 48 mm × 13.7 mm × 0.5 mm. Modeling and simulation results show that the reflection coefficient of the antenna is less than −15 dB at 860–960 MHz. Experimental studies demonstrate that the minimum threshold power of the antenna is between 23 and 26 dBm and the measured read range is 3-4 m.

Research on Piezoelectric Tube Stack for Radial Vibration Mode

2013 ◽  
Vol 721 ◽  
pp. 437-442
Author(s):  
Chao Zhong ◽  
Li Kun Wang ◽  
Lei Qin ◽  
Jing Jing Zhou ◽  
Cui Ying Chen ◽  
...  
Keyword(s):  
Vibration Mode ◽  
Analytical Calculation ◽  
Fem Simulation ◽  
Average Radius ◽  
Radial Vibration ◽  
Mechanical Equivalent ◽  
Thin Tube ◽  
Resonance Frequencies ◽  
Simulation Results ◽  
The Relationship

According to electro-mechanical equivalent principle, piezoelectric tube stack electro-mechanical equivalent circuit is derived by the admittance of single piezoelectric thin tube. The resonance frequency of piezoelectric tube stack for radial vibration mode is also calculated. The relationship between resonance frequencies and average radius, thickness and height with radial vibration mode are obtained through analytical calculation. And radial vibration mode is simulated by FEM .Analytical calculation and FEM simulation results are compared. They coincide well with each other.

Effect of Mass Added to a Force Transducer on the Dynamic-Force Correction Method

2019 ◽  
Vol 888 ◽  
pp. 72-77
Author(s):  
Akihiro Takita ◽  
Taku Iwashita ◽  
Yusaku Fujii
Keyword(s):  
Effective Mass ◽  
Dynamic Error ◽  
Force Transducer ◽  
Spring Constant ◽  
Experimental Result ◽  
Correction Coefficient ◽  
Dynamic Force ◽  
Additional Mass ◽  
Dynamic Correction ◽  
Effective Spring Constant

Dynamic-error caused by the mass attached to the sensing part of a force transducer is experimentally investigated using the Levitation Mass Method (LMM), in which the dynamic-force applied to the force transducer is measured based on the definition of force, i.e. the product of mass and acceleration. It is experimentally proved that the change in the dynamic correction coefficient (DCC) is proportional to the additional mass as expected by the theory. The effective mass and the effective spring constant of the transducer with the additional mass are estimated from the experimental result. It is experimentally proved that the DCC for the transducer with the additional mass can be calculated using the estimated properties, i.e. the effective mass and the effective spring constant, and the dynamic-error can be corrected with the calculated DCC.

Stiffness and Nature Vibration Analyses of Linear Guideway Type

2011 ◽  
Vol 308-310 ◽  
pp. 1889-1892
Author(s):  
Wei Li ◽  
Gwo Chung Tsai ◽  
Wen Zhuo Li ◽  
Thin Lin Horng
Keyword(s):  
Vibration Frequency ◽  
Natural Vibration ◽  
Structural Vibration ◽  
Mode Shapes ◽  
Natural Vibration Frequency ◽  
Resonance Frequencies ◽  
Different Types ◽  
Simulation Results ◽  
Theoretical Results ◽  
Ansys Workbench

This study investigated the solution of the rigidity and structural vibration for system of linear guideway type based on ANSYS workbench. By comparing the results derived from the simulation of the model and the corresponding theoretical results, the validity of the theoretical solution can be verified. The analysis includes the system rigidity and the natural vibration frequency in the direction of vertical slider (Vertical), rolling (Rolling) and swing (Pitching), the structural vibration frequency for system of linear guideway type is carried out, the model is built according the true dimensions, what is more, the rollers are not necessary replaced by springs, because there is not so much difficulties by using ANSYS workbench and more accurate results can be obtained in this way. Two different types of simulation are carried out, and the simulation results show that different geometric sizes of slider, which mean different numbers of rollers, will change the resonance frequencies and mode shapes, and more rollers can enhance the stiffness of the LGT model, then reduce the possibility of resonance happening.

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