Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 79 for “"force sensor"”.
-
A Force Sensor Array for Space Applications
The need for force feedback and spatial awareness of contact in harsh environment applications, such as space servicing, has been unsatisfied due to the inability of current sensor technology to resist environmental effects. In this work, capacitive sensors based on a porous polymer-ceramic …
-
An axial force sensor for a prosthetic knee
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering; and, (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
-
A contact force sensor for medical jet injection
… in a tunable, high-performance linear Lorentz-force jet injector which allows for careful control of many injection variables. The sensor presented in this thesis further improves the ability to quantify and control contact forces between the injection nozzle and tissue. This sensor uses a …
-
Optomechanical damping of a microcantilever force sensor in liquid
A new instrument, constant deflection atomic force microscopy (CD-AFM) constructed to perform force spectroscopy measurements without mechanical instabilities associated with the use of soft AFM cantilevers has been developed, tested and calibrated. One of the major limitations associated with the …
-
Calibration of an optically levitated microsphere as a force sensor
… trapped and cooled microsphere (bead) as a force sensor, it is predicted to be possible to attain force sensitivity of 10-21 N[1]. This sensitivity is achieved because the force sensor is mechanically decoupled from the environment, which allows for larger quality factors. With this …
-
Smart shoe force sensor development and analysis for walking gait
Foot contact forces are imperative to gait analysis for uses such as elderly rehabilitation and athletic training. Previously developed methods for legged locomotion force detection involved convoluted sensing systems and significant external equipment. This thesis builds upon previous developed …
-
Effects of geometry on compliant, stress field force sensor characteristics
… geometries for compliant, stress field (SF) force sensors. The goal of exploring these different sensor designs is to begin identification of the geometric properties of SF force sensors that are most optimal for certain loading conditions. This work prioritizes robotic locomotion as the …
-
Biomimetic cytoskeleton assemblies and living cells on micropillar force sensor arrays
Micropillar force sensor arrays are produced for biophysical studies of cellular and intracellular mechanics and for the assembly of suspended biofilament networks. Three types of pillars are made: (1) gold capped silicon pillars, (2) epoxy pillars and (3) polydimethylsiloxane (PDMS) pillars. …
-
A needle-tip embedded fibre optical force sensor for tissue identification
… to improve this situation is to attach optical sensors to the surgical needle. In this research, a temperature-compensated fibre optical tip force sensor based on the Fabry-Perot Interference (FPI) principle is developed and embedded into the tip of surgical needles. This was designed for tissue …
-
Development and testing of an application specific force sensor for snowpack assessment
… create a specific application for a force sensor with specifications that are over achieved at great cost when using traditional load cells. A moderately priced, compact force sensor suitable for this application does not exist, and numerous force-sensing technologies were …
-
Design and characterization of a low cost dual differential proving ring force sensor utilizing Hall-effect sensors
… dual differential hall-effect based proving ring force sensor has been designed, manufactured, and tested. Strain gauge based force sensors are among the most common methods of measuring static and dynamic forces, yet they suffer from a wide array of negative attributes including: high cost due to …
-
Design and fabrication of precision carbon nanotube-based flexural transducers
… the nanoscale, smaller and more sensitive force and displacement sensors need to be developed. Currently, many biological, materials science, and nanomanufacturing applications could benefit from multi-axis micro- and nanoscale sensors with fine force and displacement resolutions. …
-
The design of a Hall Effect force sensing flexure on the front leg of a robotic cheetah
… it is important to be able to characterize the forces felt on the moving joints. To achieve this, we designed an easy to implement force sensor that used Hall Effect sensors mounted on a flexure to measure force. The flexure was designed to be compliant in two directions, along the ground normal …
-
Ultrasensitive Force Sensing with Nanospheres in an Optical Standing Wave Trap
… progress developing a state-of-the-art neutral force sensor using an optically levitated nano-sphere. Trapping 300 nm diameter fused silica spheres using a dual beam optical standing wave trap, we have experimentally reported a force sensitivity of 1.63 0:37aN=Hz1=2. Also we have measured the …
-
Actuation and control for robotic physiotherapy
… device through the implementation of force and position control strategies. Traditional pneumatic servo systems consist of a pneumatic cylinder prone to stiction effects and a single spool valve. Here the performance of modem pneumatic servo system, consisting of a low friction …
-
Robotic Assembly and Contact Force Control
… feedback coming from the internal position/angle sensors in the joints. The robots are in general very accurate in tracking the desired motion, and they have become indispensable in many applications, such as spot welding and painting in the automotive industry. In more complex tasks, such as …
-
A modular fingertip design for normal force feedback control of a 3-fingered dextrous robotic hand
… hand mechanics over the past decade, fingertip force remains predominantly controlled by flexor cable tension and joint position. A modular fingertip normal force sensor is developed here from basic semiconducting elastomer devices. Construction techniques are defined to shape standard Interlink …
-
CRYOGENIC ATOMIC FORCE MICROSCOPE FOR CHARACTERIZATION OF NANOSTRUCTURES
… design and applications of a cryogenic atomic force microscope (AFM) for characterization of nanostructures. The cryogenic AFM with a conductive tip can measure DC current through nanostructures. We use quartz tuning fork (QTF) as the force sensor. Unique coarse z motor design provides reliable …
Page 1 of 4