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A microwave oven or simply microwave is an electric oven that heats and cooks food by exposing it to electromagnetic radiation in the microwave frequency range. [1] This induces polar molecules in the food to rotate and produce thermal energy in a process known as dielectric heating .
The compact disc player and microwave oven were introduced in 1985 doubling sales. In 1986 Emerson began importing and marketing compact refrigerators. Camcorders, telephones, and answering machines were added to its product line in fiscal 1988. Personal computers and facsimile machines were added in 1990.
In a microwave oven a waveguide transfers power from the magnetron, where waves are formed, to the cooking chamber. In a radar, a waveguide transfers radio frequency energy to and from the antenna, where the impedance needs to be matched for efficient power transmission (see below).
Emerson Electric Co. is an American multinational corporation headquartered in St. Louis, Missouri. [ 2 ] [ 3 ] [ 4 ] The Fortune 500 company delivers a range of engineering services, manufactures industrial automation equipment, climate control systems, and precision measurement instruments, and provides software engineering solutions for ...
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Non contact microwave-based radar sensors are able to see through low conductivity 'microwave-transparent' (non-conductive) glass/plastic windows or vessel walls through which the microwave beam can be passed and measure a 'microwave reflective' (conductive) liquid inside (in the same way as to use a plastic bowl in a microwave oven).
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A family listening to a crystal radio in the 1920s Greenleaf Whittier Pickard's US Patent 836,531 "Means for receiving intelligence communicated by electric waves" diagram US Bureau of Standards 1922 Circular 120 "A simple homemade radio receiving outfit" taught Americans how to build a crystal radio.