What is IR 940nm?Where are they used?

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What is IR 940nm?Where are they used?

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1)IR 940nm is the wavelength which is used in IR illuminators for security purpose.

2)Wavelength is a measure of the distance between repetitions of shape feature such as peaks,valleys or zero-crossing.Measure of how far any given particular moves.

3)Thus to measure IR illuminator 940nm equipments are used in for fully covert surveillance and tactical   deployment.