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pulse radar
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pulse radar

electronics

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career of Page

  • Page, Robert Morris
    In Robert Morris Page

    …he began work on developing pulse radar. In spite of its receiving low priority and limited support from the U.S. Navy administration, he successfully demonstrated a radar in 1936 and tested it at sea in 1937. By the time the United States entered World War II, there were 79 radars…

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principles of operation

  • principle of radar operation
    In radar: Pulse radar

    The most common type of radar signal consists of a repetitive train of short-duration pulses. The figure shows a simple representation of a sine-wave pulse that might be generated by the transmitter of a medium-range radar designed for aircraft detection. The sine wave…

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  • principle of radar operation
    In radar: Transmitters

    Furthermore, a long-pulse radar generally requires several different pulse widths: a long pulse for long range and one or more shorter, high-energy pulses with less energy to observe targets at the ranges masked when the long pulse is transmitting. (A one-millisecond pulse, for example, masks echoes from…

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electromagnetic spectrum
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The electromagnetic spectrum. The narrow range of visible light is shown enlarged at the right. Electromagnetic radiation electromagnetic spectrum Figure 1: The electromagnetic spectrum. electromagnetic spectrum
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The electromagnetic spectrum. The narrow range of visible light is shown enlarged at the right.
The electromagnetic spectrum. The narrow range of visible light is shown enlarged at the right.

electromagnetic spectrum

physics
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electromagnetic spectrum, the entire distribution of electromagnetic radiation according to frequency or wavelength. Although all electromagnetic waves travel at the speed of light in a vacuum, they do so at a wide range of frequencies, wavelengths, and photon energies. The electromagnetic spectrum comprises the span of all electromagnetic radiation and consists of many subranges, commonly referred to as portions, such as visible light or ultraviolet radiation. The various portions bear different names based on differences in behaviour in the emission, transmission, and absorption of the corresponding waves and also based on their different practical applications. There are no precise accepted boundaries between any of these contiguous portions, so the ranges tend to overlap.

Electromagnetic radiation
Electromagnetic radiationThe electromagnetic spectrum, showing radio waves, microwaves, infrared rays, visible light, ultraviolet rays, X-rays, and gamma rays.

The entire electromagnetic spectrum, from the lowest to the highest frequency (longest to shortest wavelength), includes all radio waves (e.g., commercial radio and television, microwaves, radar), infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. Nearly all frequencies and wavelengths of electromagnetic radiation can be used for spectroscopy.

This article was most recently revised and updated by Melissa Petruzzello.
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