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ultrasonic motion detector schematic


Posted by: seminar presentation
Created at: Saturday 29th of May 2010 06:38:04 AM
Last Edited Or Replied at :Saturday 29th of May 2010 06:38:04 AM
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arms. ultrasonic beams are easily blocked by thin materials, including paper and as a result False triggering is easly caused by reflections from blowing curtains, pets, and flying insects.

its is a popular device for detecting motion in a free space. it is not as versatile as the passive infra-red type mainly due to its restricted range, usually only about 9 meters max. It can be used in situations and environments which mould be unsuitable for the infra-red type as it is not affected by temperature chances.The human ear can hear sounds of frequencies between 20Hz and 20KHz (20,000Hz). Sou..................[:=> Show Contents <=:]



Navbelt and Guiecane


Posted by: Computer Science Clay
Created at: Sunday 01st of March 2009 02:29:13 AM
Last Edited Or Replied at :Sunday 01st of March 2009 02:29:13 AM
guidance for blind navbelt , navbelt and guidecane pdf, navbelt and guidecaneppt , navbelt and guidecane, Guiecane , Navbelt, navbelt wikipedia , ultrasonic blind cane,
f the NavBelt is that it is exceedingly difficult for the user to comprehend the guidance signals in time, to allow fast work.

A newer device, called GuideCane, effectively overcomes this problem. The GuideCane uses the same mobile robotics technology as the NavBelt but is a wheeled device pushed ahead of the user via an attached cane. When the Guide Cane detects an obstacle, it steers around it. The user immediately feels this steering action and can follow the Guide Cane's new path easily without any conscious effort. The mechanical, electrical and software components, user-machine interf..................[:=> Show Contents <=:]



Implementation Of Zoom FFT in Ultrasonic Blood Flow Analysis


Posted by: computer science crazy
Created at: Sunday 15th of February 2009 01:28:40 AM
Last Edited Or Replied at :Sunday 04th of March 2012 11:51:26 PM
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to many.
Narrow beam of wave is to be feed in.
Continuous mode of operation with no timed switching is applied in real time to measure Frequency and Amplitude
Doppler shift analysis for frequency content is to be done.
Creation of image - to plot in 2 Dimension.
Display using color differentiation.

REAL BLOOD FLOW ANALYSIS:

In an Ultrasonic blood flow analysis, a beam of ultrasonic energy is directed through a blood vessel at a shallow angle and its transit time is then measured.. More common are the ultrasonic analyzers based on the Doppler principle. An oscillator, oper..................[:=> Show Contents <=:]



ULTRA SONIC TECHNIQUES FOR THE DETECTION OF HIDDEN CORROSION IN AIR CRAFT WING SKIN


Posted by: seminar projects crazy
Created at: Friday 30th of January 2009 12:42:47 PM
Last Edited Or Replied at :Tuesday 15th of March 2011 12:33:41 AM
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sing a transducer at normal incidence (0o to the normal to the surface) producing a visual picture in the form of a C-scan, it is very tie consuming to point-by-point inspects large aircraft wing skin areas. In addition it is too difficult to detect disbonds in thin multilayered and fatigue cracks in the shadow region at fastener holes in airframe structures where water and humidity then are infiltrated to create corrosion and exfoliation around and under the rivets. Ultrasonic guided waves demonstrate potential as promising, global and fast inspection method. It can be used to compliment and ..................[:=> Show Contents <=:]



Waterjet Cutting WJC


Posted by: Computer Science Clay
Created at: Sunday 25th of January 2009 01:53:24 PM
Last Edited Or Replied at :Saturday 18th of February 2012 05:03:11 AM
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on the cut surface. However, motion control and vibrations due to rack/pinion that may be used in the system could lead to striations and hence design of system elements used for precision machining operations is considered very important.

Abrasives
A variety of abrasives are used in abrasive Waterjet cutting. Garnet is often used as abrasive material. Hard abrasives cut faster and deeper and also have less breakdown in mixing chamber. Sharp, angular abrasives cut
more efficiently than rounded ones because of penetration and shearing especially on difficult or t..................[:=> Show Contents <=:]



Mobile Virtual Reality Service VRS


Posted by: computer science crazy
Created at: Monday 22nd of September 2008 02:35:02 PM
Last Edited Or Replied at :Friday 28th of December 2012 11:54:07 PM
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ounds of an actual physical environment in the contest and forms of a VRS episode .

Presently, the availability of a VRS is limited to fixed-access phenomena in non-real time , for example , entertainment machines and various simulations equipment. There are also some limited fixed-access and real-time services that require low data transmission rates, such as net meetings. In the latter case, a user can experience a limited real-life environment as opposed to the former case of a non-real-life computer-generated environment. These existing virtual reality services do not allow user contro..................[:=> Show Contents <=:]



Implementation Of Zoom FFT in Ultrasonic Blood Flow Analysis


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:46:53 AM
Last Edited Or Replied at :Wednesday 14th of March 2012 02:02:27 AM
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flow analyzer using ZOOM FFT.

Blood flow analysis is done by passing a high frequency ultrasonic wave in the blood vessels through a transducer (transmitter) .The reflected signal; from the receiver transducer has a different frequency due to the Doppler principle. This signal is passed to a DSP processor to find the frequency spectrum. Because of the high frequency of the ultrasonic wave, the resolution of the frequency spectrum output will not be good. Therefore we go for advanced Zoom FFT technique, wherein a very small frequency change due to the clot formation can be obtained with a g..................[:=> Show Contents <=:]



Ultra Sonic Motor


Posted by: computer science crazy
Created at: Saturday 20th of September 2008 11:24:45 PM
Last Edited Or Replied at :Sunday 20th of June 2010 06:43:50 AM
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density, low speed, compactness in size, no electromagnetic interferences, and so on. USM is a kind of piezo motor. The proposed speed control scheme is assumed for these applications because they require quick and precise speed control of actuators for various load conditions. A speed control method of USM using adaptive control is proposed.
Artificial Neural Network (ANN), which follows the biological neural cells in brain, consists of a number of neurons and weighted links, and it has a good potential for control applications because it can approximate the non-linear input-output mapping ..................[:=> Show Contents <=:]



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