![]() ![]() ![]() Stealth aircraft have a low radar signature, degrading the radar’s ability to detect and track the aircraft, and may appear to resemble a bird more closely on a radar screen. Using radar allows traffic controllers at airports to direct aircraft traffic. For example, if directed at a plane, the radar’s reflected waves detect its aircraft type, direction, and speed. They travel in a straight line until reflected by an object they encounter. Their shorter wavelengths allow them to transmit them in a specific direction as a beam. For example, Radar (radio detection and ranging) uses microwaves with higher frequencies and shorter wavelengths. Microwaves have numerous useful civil applications. Microwaves are expressed as having frequencies between 300 million cycles per second (megahertz) and 300 billion cycles per second (gigahertz), making them high-frequency radio waves. Also, the shorter wavelength of an LRAD can be better focused and sent further downfield.įigure 11.5 ADS (Active Denial System) / LRAD (Long Range Active Denial)įrequency is expressed in Hertz, one cycle every second. This is good for a weapons system where the target is the skin’s surface with highly concentrated nerve endings. Therefore, with smaller energies and larger wavelengths, the energy is deposited deeply into the material, making a Microwave oven-good for cooking compared to a higher power and shorter wavelength that tends to deposit the majority of energy on the surface of a material. However, a military, active denial system operating at a much higher power keeps the energy collimated into a beam so it can act upon the surface of an object. But it would never act well as a weapons system because the waves are dispersed over a relatively short distance. The microwave oven can penetrate deeper within a material because the number of molecules and the amount of power allows for this to happen. About the microwave oven, an LRAD operates at a much higher energy of 80-100GHz. At this rate, the flipping of the water molecule creates friction, causing heat to be transferred to the surrounding nonresponsive material and thus cooking your food. The magnetic field changes or flips at approximately 2.5GHz/sec in a microwave or 2.5 billion times per second. When a microwave interacts with water, the energy attempts to flip the water molecule to align with the varying magnetic field. Water molecules are dipolar, meaning that they have oppositely charged ends, making them asymmetric. Electromagnetic Radiation consists of photons and an associated sinusoidal varying electric field. Microwaves interact with water molecules. The majority of the results in the last chapter will also apply here.įigure 11.1: Microwave Portion of the Electromagnetic Spectrum Figure 11.1 shows a portion of the Electromagnetic Spectrum were Microwaves occur. Most Microwave devices are designed to detect and amplify a weak microwave signal. By contrast, Microwave wavelengths of about 1cm and frequencies of 1010 Hertz or 10 Gigahertz(GHz). (Nielsen, 2022) They have a much longer wavelength and a much lower frequency than light. (Nielsen, 2022) Red light has a wavelength of about 0.7µm and a frequency of cλ, of about 4 X 1014 Hertz. ![]() Like Lasers, Microwaves are another form of electromagnetic radiation. Can drones be used for Microwave deployment as a weapon?ĭo you like Popcorn? In today’s world, you’ll most likely have to invoke the assistance of microwaves to enjoy this tasty treat. ![]() Who uses Microwaves? Civilians / Military?.How are Microwaves similar and different from Lasers?. ![]()
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