nvt shubham

7/29/2019 NVT shubham

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SHUBHAM KR. CHOUHANBY :

AJAY KUMAR GARGENGG.COLLEGE,GZB

By : Shubham kumar chouhan


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INTRODUCTION :


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It is easy to see everything inday time

But at night , we can see

a little..

And Night visiontechnology let usee again innight also..


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Night Vision technologyconsists of two majortypes:

image intensification(light amplification) and

Thermalimaging(infrared).

WORKING OF NIGHT

VISION


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They operate on the principal that all objects emit

infrared energy as a function of their temperature. In

general, the hotter an object is, the more radiation it

emits. A thermal imager is a product that collects theinfrared radiation from objects in the scene and creates

an electronic image.

Thermal images are normally black and white in

nature, where black objects are cold and white objects

are hot. Some thermal cameras show images in color .

Thermal Imaging / Thermography


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* A special lens that focuses the infrared light emitted by

all of the objects in view .

* An infrared detector .

* Signal processing unit .

* A display device .


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Thermal imaging:

ADVANTAGES:

The highest possible thermalsensitivity.

Able to detect people andvehicles at great distances.

Not affected by bright lightsources.

Able to perform high speedinfrared imaging.

DISADVANTAGES:

Expensive to purchase and tooperate.

Limited cooler operating life time.

Bulky.


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It is also called light amplification.

It is less expensive than thermal.

Light amplification technology takes the small

amount of light, such as moonlight or starlight,

that is in the surrounding area, and converts the

light energy (scientists call it photons), into

electrical energy (electrons).

IMAGE INTENSIFICATION:


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IMAGE INTENSIFICATION:

ADVANTAGES

Excellent low-light levelsensitivity.

High resolution.

Low power and cost.

Ability to identify people.

DISADVANTAGES

This method is not usefulwhen there is essentially nolight.

Possibility of damage whenobserving bright sources under

low-light conditions.


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NIGHT VISIONDEVICES


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GOGGLES

While goggles can be

handheld, they are most

often worn on the head.

Goggles are binocular(two eye-pieces) and

may have a single lens

or stereo lens,

depending on the model.


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CAMERAS

Cameras with night-

vision technology can

send the image to amonitor for display.

Also used for Wildlife

photography and moviemaking.


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Common application for night vision includes :

Military

Safety

Wildlife observation

Security

Hidden object detection

Entertainment
http://www.hownightvisionworks.com/BiggerImage.htm?BigImage=tank09.jpg


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Conclusion

The original purpose of night vision was to locate enemy

targets at night.

It is still used extensively by the military for that purpose, as

well as for navigation, surveillance and targeting.

Police and security often use both thermalimaging and

image-enhancement technology, particularly for surveillance.


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