Micro-Electro-Mechanical-Systems (MEMS) » Sensors & Actuators

Vestibular Dynamic Inclinometer (VDI)

admin — Wed, 19 Oct 2011 16:24:12 +0000

The Vestibular Dynamic Inclinometer (VDI) is a sensor motivated bu the human vesitbular system that is made up of two MEMS linear accelerometers and one MEMS gyroscope.

The VDI measures dynamic inclination parameters – inclination, angular velocity, angular acceleration and magnitude of acceleration of the base/surface of contact (gravity).

http://tinyurl.com/visheshresearch

Duration : 0:2:18

MEMS in the Machine

admin — Sun, 26 Jun 2011 23:22:43 +0000

MEMS have many applications and are found in an increasingly large number of products. These are just a few of the areas that integrate MEMS for greater functionality, reliability, and portability.

Duration : 0:1:2

Boston Micromachines 140-actuator poke test: reconstructed surface

admin — Mon, 07 Mar 2011 22:08:51 +0000

This video shows the surface computed from the raw interferograms. The resulting height is in radians of phase at the interferometer’s laser’s wavelength of 633 nm. The purpose of the poke test is to determine the amount of deformation in the surface for a given applied actuator voltage. The actuator displacement force is electrostatic and proportional to the square of the applied voltage. The adjacent actuators pull on each other and make the surface response more complicated than forcing each actuator alone. By measuring the displacement when the neighboring actuators help, allows us to derive a calibrated difference equation for the DM In an AO system, you measure the wavefront error and then dial-in the correction for the DM. This measurement allows us to figure out how to do that..

Duration : 0:0:42

Handheld, multi-axis camera stabilization device utilizing MEMS gyro sensors

admin — Fri, 26 Mar 2010 00:36:51 +0000

Handheld, multi-axis camera stabilization device utilizing MEMS gyro sensors

(U.S. Patent 7,642,741, additional patent pending)

In the field of motion picture photography, camera stabilization devices are used to isolate the camera from the natural body movements of the operator, while providing fluid maneuverability across a set. The purpose of this project is to design, build and optimize a low cost, compact gyro-based servo stabilization device for a professional handheld motion picture camera.

This device uses MEMS based rate gyro sensors mounted to a gimbaled camera rig to measure the angular rate of the camera’s rotation. The gyro signals are amplified to drive DC servo motors coupled to the camera’s rotational axes. As a gyro measures the cameras rotation about an axis, the corresponding servo motor applies an opposing torque on the platform to oppose camera rotation.

The camera is mounted to a yaw and pitch gimbaled structure, adjustable so that the rotational axes can run through the cameras center of mass, thus minimizing the torque and power required to stabilize the camera.

Each gyro rate signal is amplified by a proportional gain amplifier. An integrator circuit acting on each rate signal, helps ensure that the rig does not drift due to extraneous forces. A pair of high current, high power operational amplifiers drive each servo motor from the sum of the proportional and integrated rate signals.

Dynamic tests confirm that the gyro stabilization dramatically and consistently decreases the peak yaw rotation and peak pitch rotation relative to the clamped configuration. Further enhancements include the addition of a third axis and the use of geared motors. Experimental results are validated with a MATLAB/Simulink simulation.

Duration : 0:2:8

Electroactive Polymer Artificial Muscle (EPAM) Spring Roll Actuator

admin — Wed, 06 Jan 2010 02:18:29 +0000

Electroactive Polymer Artificial Muscle (EPAM) Spring Roll Actuator developed by SRI International. Learn more at Hizook.com — http://www.hizook.com/blog/2009/12/28/electroactive-polymers-eap-artificial-muscles-epam-robot-applications

Duration : 0:0:24

MEMS Flow Sensors

admin — Sun, 19 Apr 2009 10:48:26 +0000

tinyurl.com – This tutorial, provided by Digi-Key and Omron, discusses Omrons use of MEMS (micro electro mechanical systems) in mass flow sensors for gases. The various products and their basic operation are presented along with their features, benefits, and applications.

Duration : 0:0:55

Bio-sensor That Uses Semiconductor Diode Structure : DigInfo

admin — Sat, 11 Apr 2009 02:57:05 +0000

DigInfo – www.diginfo.tv NIMS Bio-sensor That Uses Semiconductor Diode Structure Related Links – www.nanotechexpo.jp (nano tech 2009)

Duration : 0:1:57

Lab on a chip Article: Lithographically structured microcontainers

admin — Fri, 27 Mar 2009 19:27:58 +0000

Video related to research article appearing in Lab on a Chip. Timothy G. Leong, et al. Self-loading lithographically structured microcontainers: 3D patterned, mobile microwells.

Journal Lab on a chip:

http://xlink.rsc.org/?DOI=B809098J …

Duration : 0:0:34

Rotary Microactuator (mpg).mpeg

admin — Tue, 10 Mar 2009 07:12:08 +0000

Duration : 0:1:5

Micro actuator for fiber

admin — Mon, 09 Mar 2009 03:26:57 +0000

Prototype of single optical fiber actuator for large (1000+) arrays to intercept individual star/galaxy images in telescope image plane for spectroscopy analysis. Each actuator covers a 19mm hexagonal area and can move the fiber in that area without interferring with neighboring actuators using R-Theta axis arrangement controlled by miniature stepper gearmotors. Only radial axis shown with top removed for clarity.

Duration : 0:0:30