CONTENTS Introduction Objective Electromagnetic Spectrum Microwave region Why wireless charging using microwaves Principle and operation Transmitter Design Receiver Design Process of Rectification Advantages and Disadvantages Future Scope Conclusion Bibliography INTRODUCTION With mobile phones becoming a basic part of life‚the recharging of mobile phone batteries hasalways been a problem. The mobile phones vary in their talk time andbattery
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scientific marvels far better and more accurately than watching an episode of Star Trek or reading a Superman comic. First and most important is to analyze why an X-ray works and what it is. These “rays” are high energy‚ low wavelength beams of electromagnetic energy – very similar to the light we can see; only they are completely invisible to us because our eyes lack the ability to detect its wavelength. They are produced by the movement of electrons in atoms. Electrons exist in constant orbit around
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work hand in hand with the frequency of the radio waves and the fluctuation currents that carry radio signals. Radio Frequency has different types of properties but ones that are most important are the radiation of electromagnetic waves cause by the energy in a RF current. Usually an electromagnetic wave is the main base of what is known to be Radio Technology. RF can be found emitting around conductors of electrical currents‚ they are usually not found within the conductors themselves but usually
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Examples of Radiant Energy The term radiant energy refers to energy that travels by waves or particles‚ particularly electromagnetic radiation such as heat or x-rays. Radiant energy is created through electromagnetic waves and was discovered in 1885 by Sir William Crookes. Fields in which this terminology is most often used are telecommunications‚ heating‚ radiometry‚ lighting‚ and in terms of energy created from the sun. Radiant energy is measured in joules. Ads by Google Best Solar Investments
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SPECTROPHOTOMETRY Spectrophotometry is the quantitative measurement of the reflection or transmission properties of a material as a function of wavelength It involves with the use of a spectrophotometer. A spectrophotometer is a photometer that can measure intensity as a function of the light source wavelength. A spectrophotometer is commonly used for the measurement of transmittance or reflectance of solutions‚ transparent or opaque solids‚ such as polished glass‚ or gases. Principles
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Rajaraman Introduction An antenna is an electrical conductor or system of conductors o Transmission - radiates electromagnetic energy into space o Reception - collects electromagnetic energy from space In two-way communication‚ the same antenna can be used for transmission and reception Radiation Patterns Radiation pattern o Graphical representation of radiation properties of an antenna o Depicted as two-dimensional cross section Beam width (or half-power beam width)
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INFRARED By Johnny B. English Sr. SFTY 355 - Industrial Hygiene and Toxicology Tim Deak May 29‚ 2013 Thermal radiation also known as infrared which is a form of light that can not be seen‚ we can only see visible light. Infrared gives us information that we would not be able to get from visible light. Because all object gives off some type of heat‚ yes‚ all objects even if the of cold or frozen. Cold or frozen objects only gives off a very small amount of heat‚ but this heat can be detected
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NATIONAL SENIOR CERTIFICATE EXAMINATION NOVEMBER 2008 PHYSICAL SCIENCES: PAPER I Time: 3 hours PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY 1. This paper consists of: • a question paper of 17 pages • a data and formula booklet of 3 pages (i – iii) Please make sure that your question paper is complete. 2. 3. 4. 5. 6. Remove the pages of data and formulae from the middle of this question paper. Use the data and formulae whenever necessary. Read the questions carefully. In Question 1 answer 1
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9.5.2.4 Use available evidence to suggest reasons for the differences in the range of electromagnetic radiation detected by humans and other animals: Reasons for differences in detection between humans and other animals: The differences between human detection range and other animals detection range relates to their environment in which they live in and their way of life. The detection out of the visible spectrum is usually an adaptation for survival of the organism. Humans detection
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his work in ultra-violet light. Wood has been described as the "father of both infrared and ultraviolet photography" because of the discovery of electromagnetic radiation beyond the visible spectrum and the development of photographic emulsions. He was the first to intentionally produce photographs with both infrared and ultraviolet radiation. He also coined the slightly surreal glowing appearance of foliage in infrared photographs as “Wood effect”. He identified a very low ultraviolet
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