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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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t of:
1. A Normally Closed Alarm Relay. When the detector is stable (no movement) then this relay is closed. This is connected to the appropriate alarm zone at the panel and hence the alarm loop will be closed. If however the detector senses movement then it will open this relay for approximately 5 seconds after which it will reset itself.
2. A Tamper Switch Output. This is closed until the cover is removed and is connected to the tamper circuit at the control panel.
3. 12VDC Supply Terminals. These detectors require a 12Volt supply from the panel.


Circuit description
The ci..................[:=> 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,
t 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 interface and the prototypes of the two devices are de..................[:=> 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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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 good resolution. It can be used to locate the initial presence of a blood clot. All of these tasks must be achieved 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.O..................[:=> 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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global and fast inspection method. It can be used to compliment and in some cases, be an alternative to conventional ultrasonic C-scan inspection method...................[:=> 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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h velocity jet is used to machine a material. Often it is assisted by abrasives and & is known as Abrasive. Waterjet Cutting (AWJC). The process offers a wide range of advantages. It is omni-directional and enables fully automated 3-D cutting and has unlimited creative potential. The resulting kerf width is small and hence improved yield. Forces involved are minimum and non-crushed edges even on very soft materials. Work hardening is eliminated and heat affected zone (HAZ) is absent. Environment pollution is minimised since airborne dust and fumes are absent. No deburring is required on 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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n 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-capable systems, however, will allow rather 3D representations of remote real-life environments. For instance, a passenger in a train or in a car could become a participant in a conference call in a 3D environment or become virtually present among the audience in a concert hall or sport..................[:=> 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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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 good resolution. It can be ..................[:=> 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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gation in order to reduce the speed error at each sampling period. In general, the speed of USM can be controlled by driving frequency, applied voltage, and phase difference of applied voltages. This paper adopts the driving frequency as control input in order to simplify the drive system...................[:=> Show Contents <=:]



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