scholarly journals Force measurement goes to femto-Newton sensitivity of single microscopic particle

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Xiaohe Zhang ◽  
Bing Gu ◽  
Cheng-Wei Qiu
Keyword(s):  
Thermal Noise ◽  
Force Measurement ◽  
Force Measurements ◽  
Weak Force ◽  
Microscopic Particle ◽  
Highly Sensitive

AbstractHighly sensitive force measurements of a single microscopic particle with femto-Newton sensitivity have remained elusive owing to the existence of fundamental thermal noise. Now, researchers have proposed an optically controlled hydrodynamic manipulation method, which can measure the weak force of a single microscopic particle with femto-Newton sensitivity.

Erfahrungen mit alternativen Kraftmessungen/Experiences with alternative force measurements - Comparing sensor-integrated toolholders to traditional piezo-based measurement technology

2020 ◽  
Vol 110 (01-02) ◽  
pp. 24-31
Author(s):  
Patrick Georgi ◽  
Ssrah Eschelbacher ◽  
Thomas Stehle ◽  
Hans-Christian Möhring
Keyword(s):  
Cutting Force ◽  
Force Measurement ◽  
Milling Process ◽  
The Other ◽  
Strain Gauges ◽  
Measurement Technology ◽  
Optimal Parameters ◽  
Force Measurements ◽  
Measuring Systems ◽  
The One

Die Prozessüberwachung spielt in der Zerspanung eine immer wichtiger werdende Rolle. So können zum Beispiel mittels Zerspankraftmessungen ökonomisch optimierte Parameter in Zerspanprozessen gefunden werden, die zu einer Verbesserung der Auslastung von Werkzeug und Maschine führen. Des Weiteren kann über die Zerspankraft auf den aktuellen Verschleißzustand der Werkzeuge im Prozess sowie auf die jeweils erreichbare Bearbeitungsgenauigkeit zurückgeschlossen werden. Für Zerspankraftmessungen gibt es eine Vielzahl an zur Verfügung stehenden Kraftmesssystemen; zum einen traditionelle Messtechnik auf Basis von Piezosensoren zur Kraftmessung und zum anderen Kraftmesstechnik auf der Basis von Dehnmessstreifen (DMS). Dieser Beitrag untersucht die Kraftaufnahme bei Fräs- und Bohrprozessen, bei denen beide Kraftmesssysteme simultan eingesetzt wurden.   Process monitoring plays an increasingly important role in machining. For example, through cutting force measurements, it is possible to find economically optimal parameters in the milling process, which lead to an improvement in the utilization of the tool and the machine. Furthermore, the cutting force can be used to deduce the state of wear of the tools in the process. There are varieties of available force measuring systems for this purpose; on the one hand, traditional measuring technology based on piezo sensors for force measurement and the other force measuring technology based on strain gauges (strain gauges). This article examines the force absorption in milling and drilling processes where both force-measuring systems were used simultaneously.

Extending the Capabilities of the CaBER with Highly Sensitive Force Measurements

2008 ◽  
Author(s):  
Christopher Klein ◽  
Ingo Naue ◽  
Manfred Wilhelm ◽  
Rüdiger Brummer ◽  
Jint Nijman ◽  
...  
Keyword(s):  
Force Measurements ◽  
Highly Sensitive

Force Measurements and Stationarity Analysis on the Flow Around a Single Square Column With Rounded Edges

2019 ◽  
Author(s):  
Dennis Gambarine ◽  
Arjen Koop ◽  
Gustavo Assi ◽  
Fabiano Rampazzo ◽  
Rodolfo T. Gonçalves
Keyword(s):  
Force Measurement ◽  
Offshore Wind ◽  
Column Height ◽  
Force Measurements ◽  
Offshore Wind Turbines ◽  
Hydrodynamic Behaviour ◽  
Floating Offshore Wind Turbines ◽  
Single Column ◽  
Sharp Edges ◽  
Current Incidence

Abstract Studies about the flow around single column are the preliminary way to understand the behaviour of multi-column systems, e.g. semi-submersible platforms and floating offshore wind turbines. The presence of a rounded edge in a square column can include advantages in the constructive phases, on the other hand, can include difficulty in understanding the hydrodynamic behaviour. With this aim this paper presents a 2dof force measurement for a fixed single square column with and without rounded edges. The columns tested have the aspect ratio (H/L) equal to 1.5 representing the typical column height for multi-column platforms. The aim is to investigate the forces between a single square column with rounded edges and sharp edges in different flow incidence. For both edges a total of seven different current incidence angles were performed; 0, 7.5, 15, 22.5, 30, 37.5 and 45. Reynolds number used for the experiment is equal to 40,000. Additional tests were performed to evaluate a quantitative analysis of the uncertainties due to the repeatability and time length of the experiments. This procedure is necessary for the VV studies of CFD codes, and due to this, the database can be utilized for benchmarking.

FORCE CALIBRATION OF NANO UNIVERSAL TESTING MACHINE USING MILLIGRAM WEIGHTS

2013 ◽  
Vol 24 ◽  
pp. 1360031
Author(s):  
CHUNG-LIN WU ◽  
CHING-FEN TUAN
Keyword(s):  
Force Measurement ◽  
Testing Machine ◽  
Calibration Method ◽  
Force Transducer ◽  
Force Measurements ◽  
Universal Testing Machine ◽  
Universal Testing ◽  
Small Force ◽  
Force Calibration ◽  
Force Range

This paper presents an approach for calibrating the force transducer on the nano universal testing machine using milligram weights. Previous research on force calibration of such a system focused on the range from 10 mN to 200 mN, ignoring forces below 10 mN. The main purpose of this study is to analyze and calculate the uncertainty of force measurements within the range from 0.2 mN to 10 mN. The ABA calibration method in accordance with OIML R111-1 is adopted to determine the uncertainty in force measurement. The results indicate that the maximum relative uncertainty of force measurement is 7.0 × 10−3 with a 95% confidence level. The investigation can be used as the basis for evaluating measurement uncertainty of the system in small force range.

A New Support Structure in Waverider Force Measurement

2013 ◽  
Vol 318 ◽  
pp. 96-99
Author(s):  
Xue Jun Zhao ◽  
Xiao Guo Guo ◽  
Chang Zhao
Keyword(s):  
Wind Tunnel ◽  
Force Measurement ◽  
Test Results ◽  
Force Measurements ◽  
Support Structure ◽  
Inlet Flow ◽  
Hypersonic Wind Tunnel ◽  
Vehicle Aerodynamics ◽  
Set Up ◽  
Opening And Closing

In this paper a new support structure was given to solve the problem met in the force measurement with engine jet. The force measurements of waverider were undertaken in the hypersonic wind tunnel. The test condition was at Ma=6, angle of attack α=-6°-6°, at which we researched the effects on the vehicle aerodynamics of inlet cowl opening and closing, support system, engine jet, and pressure ratios. To decrease the effects of strut on the jet flow-field, we took sharp belly strut to support the model in the wind tunnel. The belly strut could support the waverider model, force measurement balance, and it could make the inlet flow set up, and provide the high pressure jet. The test results showed that the belly sharp strut had little effects on the flowfield and could inject the inlet flow, and could provide very high quality jet.

scholarly journals Viscocapillary Response of Gas Bubbles Probed by Thermal Noise Atomic Force Measurement

Langmuir ◽  
2018 ◽  
Vol 34 (4) ◽  
pp. 1371-1375 ◽  
Author(s):  
Yuliang Wang ◽  
Binglin Zeng ◽  
Hadush Tedros Alem ◽  
Zaicheng Zhang ◽  
Elisabeth Charlaix ◽  
...  
Keyword(s):  
Thermal Noise ◽  
Force Measurement ◽  
Gas Bubbles ◽  
Atomic Force

Force Measurement by AFM Cantilever with Different Coating Layers

2006 ◽  
Vol 326-328 ◽  
pp. 377-380 ◽  
Author(s):  
Meng Kao Yeh ◽  
Bo Yi Chen ◽  
Nyan Hwa Tai ◽  
Chien Chao Chiu
Keyword(s):  
Force Measurement ◽  
Force Measurements ◽  
The Finite Element Method ◽  
Force Microscopy ◽  
Atomic Force ◽  
Nonlinear Force ◽  
Coating Layers ◽  
Afm Cantilever ◽  
Force Displacement ◽  
Spring Constants

Atomic force microscopy (AFM) is widely used in many fields, because of its outstanding force measurement ability in nano scale. Some coating layers are used to enhance the signal intensity, but these coating layers affect the spring constant of AFM cantilever and the accuracy of force measurement. In this paper, the spring constants of rectangular cantilever with different coating thickness were quantitatively measured and discussed. The finite element method was used to analyze the nonlinear force-displacement behavior from which the cantilever’s normal and torsional spring constants could be determined. The experimental data and the numerical results were also compared with the results from other methods. By considering the influence of coating layers and real cantilever geometries, the more accurate force measurements by AFM cantilever can be obtained.

Analysis of Error Sensitivity of a System for Electrowetting Force Measurement

2008 ◽  
Author(s):  
Vivek Ramadoss ◽  
Nathan Crane
Keyword(s):  
Contact Angle ◽  
Applied Voltage ◽  
Force Measurement ◽  
Tangential Force ◽  
Droplet Evaporation ◽  
Droplet Volume ◽  
Force Measurements ◽  
Improve Performance ◽  
Alignment Errors ◽  
Analysis Of Error

Electrowetting systems are commonly studied by measuring contact angle changes with applied voltage. However many applications such as digital droplet manipulation require information about the force applied to a drop to improve performance. This paper analyses a previously demonstrated method of measuring the electrowetting forces to estimate the sensitivity of force measurements to potential errors such as droplet evaporation, variation in volume, and alignment accuracy. The most significant force errors are introduced by uncertainty in droplet volume as by evaporation. However, analysis shows that this can be controlled by lowering the measurement tip to compensate for evaporation. Errors in tangential force due to alignment are shown to be small for alignment errors below 1°.

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