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  2. Electromagnetic radiation and health - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_radiation...

    Another important factor is the distance between the worker and the source of radiation. In the case of arc welding, infrared radiation decreases rapidly as a function of distance, so that farther than three feet away from where welding takes place, it does not pose an ocular hazard anymore but, ultraviolet radiation still does. This is why ...

  3. Radar jamming and deception - Wikipedia

    en.wikipedia.org/wiki/Radar_jamming_and_deception

    Because the external radar causing the transponder to respond is generally not synchronised with your own radar (i.e. different pulse-repetition frequencies), these black dots appear randomly across the display and the operator sees through and around them. The returning image may be much larger than the "dot" or "hole", as it has become known ...

  4. Doppler radar - Wikipedia

    en.wikipedia.org/wiki/Doppler_radar

    A Doppler radar is a specialized radar that uses the Doppler effect to produce velocity data about ... Since with electromagnetic radiation like microwaves or with ...

  5. I tried an EMF-blocking device to reduce my exposure to ... - AOL

    www.aol.com/finance/tried-emf-blocking-device...

    EMF stands for electric and magnetic fields, which, according to the National Institute of Environmental Health and Sciences, are invisible areas of energy often referred to as radiation.

  6. Anti-radiation missile - Wikipedia

    en.wikipedia.org/wiki/Anti-radiation_missile

    An anti-radiation missile (ARM) is a missile designed to detect and home in on an enemy radio emission source. [1] Typically, these are designed for use against an enemy radar , although jammers [ 2 ] and even radios used for communications can also be targeted in this manner.

  7. Radar warning receiver - Wikipedia

    en.wikipedia.org/wiki/Radar_warning_receiver

    Radar warning receiver (RWR) systems detect the radio emissions of radar systems. Their primary purpose is to issue a warning when a radar signal that might be a threat is detected, like a fighter aircraft's fire control radar. The warning can then be used, manually or automatically, to evade the detected threat.

  8. Radar - Wikipedia

    en.wikipedia.org/wiki/Radar

    The radar mile is the time it takes for a radar pulse to travel one nautical mile, reflect off a target, and return to the radar antenna. Since a nautical mile is defined as 1,852 m, then dividing this distance by the speed of light (299,792,458 m/s), and then multiplying the result by 2 yields a result of 12.36 μs in duration.

  9. Counter-battery radar - Wikipedia

    en.wikipedia.org/wiki/Counter-battery_radar

    Counter-battery radars operate at microwave frequencies with relatively high average energy consumption, up to the tens of kilowatts. The area immediately forward of the radar array for high energy radars is dangerous to human health. The intense radar waves of systems like the AN/TPQ-36 can detonate electrically fused ammunition at short ranges.