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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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f interest.Object motion within the region of interest and in the range of the ultrasonic motion sensor is detected and an alarm signal is produced.The range of these detectors differs from the designed range whenever the actual atmospheric sound propogation conditions vary from the atmospheric conditions assumed in the design .Ultrasonic motion detectors are commonly used for automatic door openers and security alarms. 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 flyin..................[:=> 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,
sonic sensors. It provides acoustic signals via a set of stereo earphones that guide the user around obstacles or displace a virtual acoustic panoramic image of the traveller's surroundings. One limitation of 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 a..................[:=> 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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blood flow. These techniques are not affordable by the poor people because of their high expense. So we have implemented a technique called Zoom-FFT. This technique is simple and affordable to detect the blood clots and other diseases.

Human with his potential tries to get whichever is unexplored, explored, and till now we are managing and succeeding using some technical ways. In the same way this is one of the explorations made for scanning the intra details of some specific objects using ultrasound named SONOGRAPHY, which is used as an alternative to x-ray photography. In this paper, the ..................[:=> 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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g skin structures is an ongoing NDT challenge. Ultrasonic methods are known and well-accepted techniques, which are relatively simple to carry out in terms of setup, probes and instrumentation and operator training. However, with conventional inspection from the top surface using 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 f..................[:=> 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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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 thick materials. Heavier particles tra..................[:=> 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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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 control in viewing 3D environments, and they are generally limited to viewing images on a monitor in two dimensions.

The VRS-capa..................[:=> 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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with a single DSP chip in order for the system to be both cost-effective and power
efficient and thus widely accepted.

This paper proposes:
1.Study of Bio-medical signal processing
2.Mixing down the input signal to the base band frequency using Hilbert Transform
3. Finding the down sampling using the decimation process
4.Obtaining the spectrum output using fast Fourier transform
5.Simulation is done by Matlab/C.
6.TMS320C5X/6X DSP processor does real time implementation.

Steps involved:
Sound generation: The ultrasonic sound is generated using the piezoelectric transducer
..................[:=> 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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oller is adopted, and the weights of the links are updated using the general back propagation in order to reduce the speed error at each sampling period. In general, the speed of USM can be controlled by driving frequency, ..................[:=> Show Contents <=:]



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