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Sharma, Nipun
- Holography
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International Journal of Innovative Research and Development, Vol 2, No 5 (2013), Pagination:Abstract
Holography is the technique of forming 3 dimensional images by use of lasers, based on the phenomenon of interference and diffraction of light. The British Physicist Dennis Gabor first invented holographic method in year 1971. From then until now many scientist and theoretical physicists have introduced many holography methods each one proving better then the other. In this paper we are trying to study the methods of producing holographic images and using that concept in designing a holographic security system. In this research we shall also study about the use of laser and its use in producing the holographic images. For a better understanding of the concept of holography we need to understand interference and diffraction. We will try to explore more holography applications as once Elbert Einstein said- "If we knew what it was we were doing, it would not be called research, would it? " Therefore our main focus is that all the concepts are easy to understand from the perspective of beginners as well as the masters of this field.
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- RF Energy Harvesting and Storage System of Rectenna:A Review
Abstract Views :210 |
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Authors
Affiliations
1 Desh Bhagat University, Fatehgarh Sahib – 147301, Punjab, IN
2 Thapar University, Patiala – 147004, Punjab, IN
1 Desh Bhagat University, Fatehgarh Sahib – 147301, Punjab, IN
2 Thapar University, Patiala – 147004, Punjab, IN
Source
Indian Journal of Science and Technology, Vol 11, No 25 (2018), Pagination: 1-5Abstract
Objectives: In this paper, a discussion of different types rectennas (antenna + rectifier) which is used for different type of RF energy harvesting ambient signals and storage system. Methods/Statistical Analysis: RF energy can be harvested in the ISM unlicensed band from various ambient source in particular from mobile radio transmitters, Wi-Fi networks, wireless devices (laptops). The RF energy is captured using antenna preferable patch antenna. The received signal is converted into DC voltage using a impedance matching circuit and a voltage multiplier. Received output voltage is enhanced using various methods in order to make it sufficient to charge low power devices. Findings: After the literature review it has been observed that antenna designed to harvest RF energy should have high efficiency, gain and impedance matching with rectifier circuit. Applications: Rectennas find their application in Sensor networks, small wireless devices which needs power which should be portable.Full Text
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