Light modulator

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  • Introduction to LEDs: How LEDs work + some points. Comparison with other sources of light. LED in communication. Blue &White LED technologies. How they are made? Their application? Brief about blue laser? Stands for light emitting diode. Semiconductor device: p-n junction forward-biased.current emits incoherent narrow spectrum light (due to recombination in transition region near the junction.) Color of the emitted light depends on the chemical of the semiconducting material used. (Near-ultraviolet, visible or infrared.)...

    ppt52p lehieukutek 26-12-2009 181 132   Download

  • First off, it’s all about the lumens. Lumens are the visible light given off by a source, and they are the ultimate goal. Wattage has often been confused with lumens, thanks to how incandescent bulbs are rated (everyone knows that a 60W bulb is not as bright as a 100W one), but more efficient lighting technologies have greatly changed the relationship between wattage (essentially power usage) and lumens (light output). For example, an incandescent might operate at about 12-15 lumens-per-watt (lm/W), while an LED bulb will be in the range of 40-50, a much greater luminous efficacy...

    pdf69p aries23 29-09-2012 79 31   Download

  • Module CPU chính bao gồm: (H1-2, 1-3, 1-4)CPU: thực hiện chương trình và chứa dữ liệu cho điều khiển các quá trình tự động. Nguồn cấp điện (Power supply) Các đầu vào/ra hệ thống (Inputs/Outputs) Các cổng truyền thông (Communications Port) Các đèn trạng thái (Status light ).Điện tử (còn gọi là electron, được biểu diễn như là e−) là một hạt hạ nguyên tử, hay hạt sơ cấp. Trong nguyên tử electron quay xung quanh hạt nhân (bao gồm các proton và neutron) trên quỹ đạo electron....

    ppt144p khoitdha 01-10-2010 364 179   Download

  • In this demonstration, you will use Microsoft Visual Studio® .NET to run code in which a delegate to a light object’s method is passed to a switch object. When the switch object’s state changes, the switch object calls the light object’s method and passes its new state.

    pdf48p daokim 10-08-2009 75 19   Download

  • The field of clectronic music is undergoing an electronics revolution similar to thc current microproccssor/microcomputer revolution. Initially music synthesizcrs wcrc built using discrete components-transistors, resistors, capacitors, etc. Synthcsizer modules wcre fairly complex in design and were subject to temperature stability and reliability problems due to the large number of individual components used.

    pdf308p nguyenthai_thinh 16-03-2013 38 15   Download

  • The purpose of this book is to provide the reader with an introduction to lasers and their industrial applications. To facilitate this objective, such devices as photodetectors and modulators, which are frequently found in laser applications, are also covered. And to make the book as self-contained as possible, the concepts of basic optics that are pertinent to lasers and their applications are presented.

    pdf259p echbuon 02-11-2012 27 13   Download

  • In 2009 the world celebrated 50 years of lasers, bringing to the attention of the public how deeply lasers and laser related technologies have revolutionized both science and everyday life. Next year will be the fiftieth anniversary of the semiconductor laser. Used as a compact light source with high modulation rates, it transformed telecommunications in combination with glass fibers. Today laser diodes are omnipresent in data storage and communication. Still, most of these applications are based on infrared or red laser diodes.

    pdf109p hotmoingay 03-01-2013 33 6   Download

  • The pelvic examination begins with a visual inspection of the external geni- talia using the assistance of a good light source. Although skin cancer is rare in this region, it is often diagnosed late. Vulvar cancer can be hyperpig- mented, erythematous, or hypopigmented, and any such lesions require care- ful evaluation and often biopsy (see Chapter 17). Lichen sclerosus is a relatively common condition in which the vulvar skin may appear like parch- ment. It is more common in postmenopausal women, but occurs in all ages, and can be associated with cancer. ...

    pdf12p connicquy 20-12-2012 22 5   Download

  • That public face has or may have an extra dimension – sprezzatura. The term, used by Baldassar Castiglione in his work ‘The book of the courtier’, was described by Stemp (2006, 6) as ‘a lightness of touch that a well educated man should have in a variety of activities such as music painting and writing’. Though determined by its time, the term anticipates the evolution of aesthetic labour. That is the main thrust, the main question of this paper. Castiglione goes on to state (1528, 67) that sprezzatura is ‘to practise in all things a certain nonchalance...

    pdf0p giamdocamnhac 06-04-2013 26 5   Download

  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Light has a specific role in modulating Arabidopsis gene expression at low temperature

    pdf20p panasonic06 26-12-2011 21 3   Download

  • They were, one and all, from the broadest and best to the narrowest and least frequented, very dark. The oil and cotton lamps, though regularly trimmed twice or thrice in the long winter nights, burnt feebly at the best; and at a late hour, when they were unassisted by the lamps and candles in the shops, cast but a narrow track of doubtful light upon the footway, leaving the projecting doors and house-fronts in the deepest gloom. Many of the courts and lanes were left in total darkness; those of the meaner sort, where one glimmering light twinkled for a...

    pdf76p saimatkhauroi 01-02-2013 30 3   Download

  • Liquid crystal technology is a subject of many advanced areas of science and engineering. It is commonly associated with liquid crystal displays applied in calculators, watches, mobile phones, digital cameras, monitors etc. But nowadays liquid crystals find more and more use in photonics, telecommunications, medicine and other fields. The goal of this book is to show the increasing importance of liquid crystals in industrial and scientific applications and inspire future research and engineering ideas in students, young researchers and practitioners....

    pdf242p kimngan_1 05-11-2012 27 2   Download

  • All modules are being extensively evaluated by students and by faculty. As a consequence, in the second year a one-week kickoff module has been introduced, and the project management module which ini- tially was a two-week module has been shortened to one week in order to create an additional one-week module for the analysis of change cases. In a second curriculum adjustment after another two years, common modules with the Executive MBA in General Management program were identified.

    pdf6p thieubaotrang 16-04-2013 13 2   Download

  • 3. Chỉnh ánh sáng Mục Basic trong module Develop phần có 6 thanh trượt khác nhau để chỉnh ánh sáng. Exposure: Độ phơi sáng của vùng highlight Recovery: Khôi phục lại các chi tiết bị mất ở vùng highlight Fill Light: Tăng sáng cho vùng shadow (khôi phục chi tiết bị mất ở vùng shadow) Blacks: Vùng shadow Brightness: Độ sáng Constrast: Độ tương phản Nhìn vào histogram, ta sẽ thay hai hình tam giác ở hai phía trên cùng của histogram.

    pdf8p muadongamap222 05-05-2010 390 256   Download

  • In simple terms, a passive CWDM implementation involves placing VAM modules and upgraded transmitters and receivers at each end of the network segment. CWDM equipment performs two functions: 1) segregates the light to ensure only the desired combination of wavelengths are used, and 2) multiplexes and demultiplexes the signal across a single fiber link.

    pdf4p mylinh 13-08-2009 75 13   Download

  • THE AMPLITUDE MODULATED RADIO RECEIVER The electromagnetic disturbance created by the transmitter is propagated by the transmitter antenna and travels at the speed of light as described in Chapter 2. It is evident that, if the electromagnetic wave encounters a conductor, a current will be induced in the conductor. How much current is induced will depend on the strength of the electromagnetic field, the size and shape of the conductor and its orientation to the direction of propagation of the wave....

    pdf32p tienvovan 11-09-2010 51 11   Download

  • Optical Transmitters The role of the optical transmitter is to convert an electrical input signal into the corresponding optical signal and then launch it into the optical fiber serving as a communication channel. The major component of optical transmitters is an optical source. Fiber-optic communication systems often use semiconductor optical sources such as light-emitting diodes (LEDs) and semiconductor lasers because of several inherent advantages offered by them.

    pdf56p khinhkha 29-07-2010 59 7   Download

  • Fibre Optics in Metrology With a carrier frequency of some 1014 Hz, light has the potential of being modulated at much higher frequencies than radio waves. Since the mid-1960s the idea of communication through optical fibres has developed into a vital branch of electro-optics. Great progress has been made and this is now an established technique in many communication systems. From the viewpoint of optical metrology, optical fibres are an attractive alternative for the guiding of light.

    pdf18p huggoo 23-08-2010 49 4   Download

  • ADC’s micro cables provide factory standard guaranteed performance specifications. They are 100% optically tested and are offered with a variety of optical performance levels. Features: • Extremely light weight • Extremely small outer diameter • Easily terminate to industry standard connectors • Wide variety of materials to suit your specific requirements Applications: • Patch cords and pigtails • Small conduit • LASER modules for telephony applications

    pdf4p thuyvan 13-08-2009 58 3   Download

  • Light/dark modulation of the higher plant Calvin-cycle enzymes phosphoribulokinase (PRK) and NADP-depend-ent glyceraldehyde 3-phosphate dehydrogenase (NADP-GAPDH-A2B2) involves changes of their aggregation state inaddition to redox changes of regulatory cysteines.Herewe demonstrate that plants possess two different complexes containing the inactive forms (a) of NADP-GAPDH and PRK and (b) of only NADP-GAPDH, respectively, in darkened chloroplasts.

    pdf8p tumor12 22-04-2013 14 1   Download


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