Friday, August 26, 2011

Infrared and how it works

Infrared light is electromagnetic wavelength than visible light is between 700 nm and 1 mm. Infrared light is invisible light. When viewed with a spectroscope the light is infrared radiation to visible light on the electromagnetic spectrum with wavelengths on the wavelength of red light. With this wavelength the infrared light will be invisible to the eye but the resulting heat radiation still feels / detected. Infrared can be divided into three areas namely:

* Near Infrared………………0.75 - 1.5 µm
* Mid Infrared....……………...1.50 - 10 µm
* Far Infrared………………….10 - 100 µm

Direct sunlight contained 93 lumens per watt of radiant flux that includes an infrared (47%), visible light (46%), and ultra violet light (6%).

Infrared rays contained in the firelight, sunlight, radiators asphalt road vehicle or a reflection of the heat affected. Nerves on our skin can menginderai differences in skin surface temperature, but We Can not feel the infrared rays. Infrared rays are used to heat food. For example even at fast-food restaurant.
How can we utilize the principle of infrared to see the objects?
We make use of infra-red detectors every object that emitted infrared and will reflect or absorb infra-red so that the detector captures a different wavelength according to the temperature of the removed objects.
"Because the main source of infra red radiation is thermal radiation or heat, every object has a specific heat that we think are not even hot enough to radiate visible light can expend energy at infrared and visible, more heat can she radiates something more infrared radiation".
This is the basis of the detection of human body temperature and detection sensors to identify people stricken with bird flu or flu Firus pigs at international airports. Many objects absorb infra red radiation, but there is also reflecting in particular near infrared light, near infra red rays are not related to the temperature of the object unless the object is very hot temperature.
Infrared film (infrared detector) on the camera can see objects aided by sunlight and other light source inssue infra red rays from it then reflected and absorbed by object. we can get a color object with the help of reflection and the absorbed infrared object, the color of the object is combination of red color blue, green (RGB) and infra red.
Infra-red can be used also as a wave cariier can extend the distance limit of wave reception, but the transmitted wave must be line of sight (LOS) or straight-infrared can not turn if the transmit radius of vertical beam was blocked by an object even though it was transparent. This theory we apply in the digital wave modulation on the remote tv. Mobile is now integrated with infrared and blue tooth devices to communicate with the pc. Examples of its application of mobile application delivery from pc or vice versa, providing a record of phone number of the pc very much that it can not be stored in phone memory is usually used for broadcasting SMS.
What is the difference infrared rays with blue tooth?
The first, uses infrared light to emit a signal, such as tv remote, while the blue tooth uses radio frequency (RF) (2.4 GHz) for broadcasting signals.
second, infra red can not penetrate objects that prevented to reach the receiver or need reflection, because of its light. However, Bluetooth can penetrate objects such as walls, as far as not having a high skin depth.

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