Whole field decoupling of predistortion on polymeric cell force transducer

2011 ◽  
Vol 98 (17) ◽  
pp. 173701
Author(s):  
Xiaoyu Zheng ◽  
Xin Zhang
Keyword(s):  
Force Transducer ◽  
Cell Force

Surface micromachined polysilicon heart cell force transducer

2000 ◽  
Vol 9 (1) ◽  
pp. 9-17 ◽  
Author(s):  
G. Lin ◽  
K.S.J. Pister ◽  
K.P. Roos
Keyword(s):  
Force Transducer ◽  
Heart Cell ◽  
Cell Force

scholarly journals Development of force plate for prosthetic applications interfacing with internet of things

2018 ◽  
Vol 7 (2.7) ◽  
pp. 944
Author(s):  
Y Bharat Satya Kumar ◽  
Y Kalyan Chakravarthy ◽  
Ratna Prasad Paladagu ◽  
R Venkatesh ◽  
A Srinath
Keyword(s):  
Ground Reaction Force ◽  
Load Capacity ◽  
Reaction Force ◽  
Force Plate ◽  
Maximum Load ◽  
Force Transducer ◽  
Electrical Signal ◽  
Limb Kinematics ◽  
Cell Force ◽  
Lower Limb Kinematics

Force Plate is a measuring instrument which is used to calibrate the ground reaction force in gait cycle analysis of a subject (human or animal). Force plates are used to examine the lower limb kinematics for the applications of prosthetics, sports etc. In this study, a prototype of force plate is developed indigenously in an economical manner. It comprises of two metallic frames with a load cell (force transducer) mounted between them to produce an electrical signal as output, that is proportional to the amount of force applied on the surface of force plate. This prototype has a maximum load capacity of 3000N. The design of the force plate system along with the ground reaction force analysis and results are discussed below.  

Miniature heart cell force transducer system implemented in MEMS technology

2001 ◽  
Vol 48 (9) ◽  
pp. 996-1006 ◽  
Author(s):  
Gisela Lin ◽  
R.E. Palmer ◽  
K.S.J. Pister ◽  
K.P. Roos
Keyword(s):  
Force Transducer ◽  
Heart Cell ◽  
Mems Technology ◽  
Cell Force

Nano-Porous Substrates Reduce Beetle Attachment Force

2008 ◽  
Author(s):  
E. Gorb ◽  
N. Hosoda ◽  
S. Gorb
Keyword(s):  
Force Measurement ◽  
Glass Plate ◽  
Coccinella Septempunctata ◽  
Traction Force ◽  
Force Transducer ◽  
Back Side ◽  
Force Measurements ◽  
Cell Force ◽  
Insect Attachment ◽  
Porous Substrates

Traction experiments with the seven-spotted ladybird beetles Coccinella septempunctata (L.) (Coleoptera, Coccinellidae) were carried out to study the influence of surface structure on insect attachment. Force measurements were performed with tethered walking insects using a load cell force transducer. For each beetle, forces were measured on five different substrates: (1) smooth glass plate; (2) smooth solid Al2O3 (sapphire) disc; (3 – 5) porous Al2O3 discs (anodiscs, back side) with the same pore diameter (220 – 235 nm), but different porosity (28, 42 and 51%). Males (N = 10) and females (N = 10) were used in experiments (10 single runs on each surface). Additionally, inversion tests were performed after each traction force measurement. The force ranged from 0.368 to 10.370 mN in males and from 0.514 to 6.262 mN in females. In both sexes, the highest force values were obtained on the smooth glass and sapphire surfaces, where males generated considerably higher forces compared to females. On all three porous substrates, forces were significantly reduced in both males and females, and the only difference for surfaces was obtained between two extremes: anodiscs with the highest (51%) and lowest (28%) porosity. Males produced essentially lower forces than females on anodiscs samples. Experimental insects performed well and showed normal locomotion on both smooth surfaces. On all anodiscs samples, beetles usually were not able to get a grip and slid over the surface, refused to walk and came to a standstill or even turned over on their backs. When substrates were inverted to 90° and 180°, insects were still able to remain attached to both the glass and sapphire samples, but failed on anodiscs. The reduction of insect attachment on anodiscs surfaces is explained by (1) possible absorption of the secretory fluid from insect pads by porous media and (2) effect of surface roughness.

Roughness-dependent friction force of the tarsal claw system in the beetlePachnoda marginata(Coleoptera, Scarabaeidae)

2002 ◽  
Vol 205 (16) ◽  
pp. 2479-2488 ◽  
Author(s):  
Zhendong Dai ◽  
Stanislav N. Gorb ◽  
Uli Schwarz
Keyword(s):  
Surface Roughness ◽  
Friction Force ◽  
Relative Size ◽  
Particle Diameter ◽  
Force Transducer ◽  
Average Particle ◽  
Substrate Texture ◽  
Surface Irregularities ◽  
Force Range ◽  
Cell Force

SUMMARYThis paper studies slide-resisting forces generated by claws in the free-walking beetle Pachnoda marginata (Coleoptera, Scarabaeoidea)with emphasis on the relationship between the dimension of the claw tip and the substrate texture. To evaluate the force range by which the claw can interact with a substrate, forces generated by the freely moving legs were measured using a load cell force transducer. To obtain information about material properties of the claw, its mechanical strength was tested in a fracture experiment, and the internal structure of the fractured claw material was studied by scanning electron microscopy. The bending stress of the claw was evaluated as 143.4-684.2 MPa, depending on the cross-section model selected. Data from these different approaches led us to propose a model explaining the saturation of friction force with increased texture roughness. The forces are determined by the relative size of the surface roughness Ra (or an average particle diameter) and the diameter of the claw tip. When surface roughness is much bigger than the claw tip diameter, the beetle can grasp surface irregularities and generate a high degree of attachment due to mechanical interlocking with substrate texture. When Ra is lower than or comparable to the claw tip diameter, the frictional properties of the contact between claw and substrate particles play a key role in the generation of the friction force.

scholarly journals Enhanced Signal-to-Noise and Fast Calibration of Optical Tweezers Using Single Trapping Events

Micromachines ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 570
Author(s):  
Alexander B. Stilgoe ◽  
Declan J. Armstrong ◽  
Halina Rubinsztein-Dunlop
Keyword(s):  
Brownian Motion ◽  
Optical Tweezers ◽  
Optical Trap ◽  
Force Transducer ◽  
Signal To Noise ◽  
Likelihood Estimator ◽  
Micro Fluidics ◽  
Large Numbers ◽  
Force Reconstruction ◽  
Micron Particle

The trap stiffness us the key property in using optical tweezers as a force transducer. Force reconstruction via maximum-likelihood-estimator analysis (FORMA) determines the optical trap stiffness based on estimation of the particle velocity from statistical trajectories. Using a modification of this technique, we determine the trap stiffness for a two micron particle within 2 ms to a precision of ∼10% using camera measurements at 10 kfps with the contribution of pixel noise to the signal being larger the level Brownian motion. This is done by observing a particle fall into an optical trap once at a high stiffness. This type of calibration is attractive, as it avoids the use of a nanopositioning stage, which makes it ideal for systems of large numbers of particles, e.g., micro-fluidics or active matter systems.

An improved force transducer using amorphous ribbon cores

1981 ◽  
Vol 17 (6) ◽  
pp. 3376-3378 ◽  
Author(s):  
T. Meydan ◽  
M. Blundell ◽  
K. Overshott
Keyword(s):  
Amorphous Ribbon ◽  
Force Transducer
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