APPLICATIONS OF MICROWAVES EBOOK!
Microwaves and Application Areas. Microwaves are radio waves radio waves with wave lengths ranging from as long as one meter to as short as one millimeter, or equivalently, with frequencies between MHz ( GHz) and GHz. The application areas are many can be categories in different ways. Microwaves are very short radio waves covering the range roughly between λ = 10 em. and 1 mm. wave lengths. This spectrum of the electromagnetic waves. its about the paractical applications of microwaves.
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What Are Microwaves?
Three conductive rings were placed around the alumina crucible to shape the microwave field. The temperature increased with some degree of nonuniformity during a slow increase in microwave power. A locally high-temperature applications of microwaves would commence at one end of the load and gradually spread throughout the entire load.
After optimizing the process, uniform density among the parts was obtained. Energy consumption was estimated to be on the order of 80 percent less than experienced with conventional heating.
In this case, electric heat is mandated for conventional applications of microwaves because of the tendency of the material to oxidize in combustion gases. Issues in Microwave Sintering Microwave Enhancement Effects There have been numerous reports of enhancement of sintering kinetics when using microwave processing.
As discussed in Chapter 3 of this report, significant errors in temperature measurement can lead to misleading processing results. Shielded and grounded thermocouples, as discussed in Chapter 3as well as optical pyrometers, were used to minimize temperature-measurement errors, and carefully designed insulation systems were used in the studies referenced above to minimize temperature gradients.
By switching the microwave power off and on, and observing thermocouple response, it was demonstrated that the microwave field did not bias the thermocouple output Janney et al. When an object is approaching the antenna, the returning microwaves are compressed and thus have a shorter wavelength and higher frequency.
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Conversely, return waves from objects moving away are elongated and have a longer wavelength and lower frequency. By measuring this frequency shift, the speed of an object toward applications of microwaves away from the antenna can be determined.
Common applications applications of microwaves this principle include simple motion detectors, radar guns for speed-limit enforcement, radar altimeters and weather radar that can track the 3D motion of water droplets in the atmosphere.
These applications are called active sensing, because microwaves are transmitted, and the reflected signals are received and analyzed.
Microwaves and Application Areas
In passive sensing, natural sources of microwaves are observed and analyzed. Many of these observations are conducted by satellites looking either back at the Earth or out into space.
applications of microwaves
Microwave heat sources One of the applications of microwaves common uses of microwaves is to heat food quickly. Microwave ovens are possible because microwaves can be used to transmit thermal energy. The discovery of this phenomenon was purely accidental.
Other Uses of Microwaves
In his book, " They All Laughed All warm objects emit low level microwave black-body radiationdepending on their temperatureso in meteorology and remote sensing microwave radiometers are used to measure the temperature of objects or terrain.
Microwave uses Microwave technology is extensively used for point-to-point telecommunications i. Microwaves are especially suitable for this use since they are more easily focused into narrower beams than radio waves, allowing frequency reuse ; their comparatively higher frequencies allow broad bandwidth and high data transmission ratesand antenna sizes are smaller than at lower frequencies because antenna size is inversely proportional to transmitted frequency.
Microwaves are used in spacecraft communication, and much of the world's data, TV, and telephone communications are transmitted long distances by microwaves between ground stations and communications satellites.
Microwaves are also employed in microwave ovens and in radar technology. The FCC recently[ when? Dozens of service providers across the country are securing or have already received licenses from the FCC to operate in this band. Commercial implementations are in the 2.
Microwave radio is used in broadcasting and telecommunication transmissions because, due to their short wavelength, highly directional antennas are smaller and therefore more practical than they would be at longer wavelengths lower frequencies. Typically, microwaves are used in television news to transmit a signal from a remote location to a television station from a specially equipped van.
Most satellite communications applications of microwaves operate in the C, X, Ka, or Ku bands of the microwave spectrum. These frequencies allow large bandwidth while avoiding the crowded UHF frequencies and staying below the atmospheric absorption of EHF frequencies.
Satellite TV either operates in the C band for the traditional large dish fixed satellite service applications of microwaves Ku band for direct-broadcast satellite. Military communications run primarily over X or Ku-band links, with Ka band being used for Milstar.