At TEDIndia, Pranav Mistry demos several tools that help the physical world interact with the world of data -- including a deep look at his SixthSense device and a new, paradigm-shifting paper "laptop." In an onstage Q&A, Mistry says he'll open-source the software behind SixthSense, to open its possibilities to all.
Definition:
Displacement sensor is use to sense and measure the displacement of the object.
Principle:
Light is sent through a transmitting fiber and is made to fall on a moving target.The reflected beam from the target is sensed by a detector with respect to intensity of light reflected from it and hence the displacement of the target is measured.
This type of sensor consists of a bundle of transmitting fibers coupled to a laser source and a bundle of receving fibers coupled to a detector as shown below.
Working:
To measure the displacement of the target,first light from the source is transmitted through the transmitting fiber and it is made to fall on the moving target.
The reflected beam from the target is made to pass through the receiving fiber and this light is detected by the detector.The intensity of the light received back depends on the displacement of the target.
If received intensity increases,it indicates thatthe target is moving towards the sensor.But if the intensity of light received inceases,it indicates that the target is moving away from the sensor.
Thus the displacement of the target can be measured from the intensity of the light received.
Have you played with Google Labs' NGram Viewer? It's an addicting tool that lets you search for words and ideas in a database of 5 million books from across centuries. Erez Lieberman Aiden and Jean-Baptiste Michel show us how it works, and a few of the surprising things we can learn from 500 billion words.
Temperature sensor is a sensor used to sense and measure the temperature of an object.
Principle:
The operation of the temperature sensor is based on the light absorption characteristics of silicon as a function of temperature.The absorption of light by the silicon layers varies with temperature and the variation modulates the intensity of the light received at the detector.
The fiber is coated at one end with a thin silicon layer.This silicon layer is coated with a reflective coating at the back.The light source is connected into the fibre from one of its ends.The detector is used to receive the reflected signal from silicon layer.A simple thermometer can be built using LED as a light source and a photodetector to measures the intensity of light.
When the light is passed through the fiber from the source and the light after reflecting from the silicon layer returns to a detector.During this process,light is absorbed by the silicon layer.The absorption of light by silicon layer varies with temperature and this variation modulates the intensity of the light received at the detector. A Photodetector is used to measure the intensity of light and temperature is sensed.Temperature int the range from 80 degree to 700 degree celsius is measured using this technique.
FIBRE-OPTIC SENSORS
One of the most exciting applications of optical fibres is fibre-optic sensors.A Sensor is transducer which converts one form of energy(physical variable) into another.The Sensors find wide applications in sensing and measuring acoustic fields,magnetic fields,current, rotation,acceleration, strain,presure,temperature and so on.
TYPES OF SENSORS
There are two types of Sensors.They are
2.Extrinsic sensors(or)Passive sensors:
In extrinsic sensors(or) passive sensors,separate sensing element is used and the fibre acts as a guiding media to the sensors.
Nokia Morph - A concept phone with the use of nanotechnologyNokia Research Centre (NRC) and the University of Cambridge have developed a nanotechnology concept device, called the Morph, which was introduced today. The new device will be on display in The Museum of Modern Arts (MoMA) in New York, from February 24 to May 12, 2008.
The Morph is intended to demonstrate the flexibility of future mobile devices, in regards to their shape and form allowing the users to transform them according to their preference. It also suggests that transparent electronics and self-cleaning surfaces might be what the future holds.
Parts (elements) of Morph could be commercially available for use in other mobile devices within 7 years. Due to the initial high price for manufacturing those, they will be suitable for high-end devices.
Steve Jobs, chief executive officer and co-founder of Apple Computer and of Pixar Animation Studios, urged graduates to pursue their dreams and see the opportunities in life's setbacks -- including death itself -- at the university's 114th Commencement on June 12, 2005.
Plenty of robots can fly -- but none can fly like a real bird. That is, until Markus Fischer and his team at Festo built SmartBird, a large, lightweight robot, modeled on a seagull, that flies by flapping its wings.
Using three iPods like magical props, Marco Tempest spins a clever, surprisingly heartfelt meditation on truth and lies, art and emotion.