A power-adjustable deep ultraviolet light source for ultraviolet non-line-of-sight communication

Abstract

A power-adjustable deep-ultraviolet light source applied to ultraviolet light non-line-of-sight communication comprises an electronic gun and a fluorescent screen, wherein the fluorescent screen comprises an aluminum film, a fluorescent film and a quartz window, a layer of fluorescent film is coated on the quartz window, a layer of aluminum film is coated on the fluorescent film, electrons emittedfrom a lamp filament pass through a negative electrode, a gate, an acceleration electrode, a focusing electrode and a high-voltage positive electrode to form electron beams, the electron beams penetrate through the aluminum film, the fluorescent screen is bombarded to generate deep ultraviolet light and the deep ultraviolet light is emitted outwards through the quartz window. By arranging a layerof aluminum film between the fluorescent film and the electronic gun, the aluminum film forms a conductive layer, the fluorescent screen is prevented from being bombarded by the electron beams to form charge accumulation, meanwhile, light backwards emitted from the fluorescent layer is emitted out forwards by a reflection effect of the aluminum film, so that luminance of the fluorescent screen can be improved. By the non-line-of-sight communication light source, the service lifetime can exceed 10,000 hours, and meanwhile, a substance having pollution to an environment cannot be generated.

Description

technical field [0001] The invention relates to the field of electron optics and communication technology, in particular to a power-adjustable deep ultraviolet light source applied to ultraviolet non-line-of-sight communication. Background technique [0002] In view of the confidentiality, all-roundness and reliability requirements of military communications, research on new electron beam excitation ultraviolet light sources applied to ultraviolet light communication in military non-line-of-sight communications is carried out to overcome the large wavelength, difficult modulation and low power of current ultraviolet light sources Breakthroughs in key technologies such as electron beam current, energy optimization control, spectrum and power testing of extreme ultraviolet light in a vacuum system, preparation of extreme ultraviolet light fluorescent screens, and development of prototype devices that can be applied to non-line-of-sight ultraviolet light communication light sour...

AI Technical Summary

Problems solved by technology

[0004] (1) Ultraviolet gas discharge lamps are relatively cheap in price, high in emission power, high in excitation voltage, difficult to drive at high speed, large in size, fragile, and short in life

[0005] (2) Ultraviolet lasers have low conversion efficiency, high price, short service life, pulse repetition period is sensitive to temperature, and are not easy to drive at low voltage and high speed, etc.

[0006] (3) Ultraviolet light-emitting diodes are small in size and high in efficiency, but the emission power of ultraviolet light-emitting diodes is low, and it is difficult for domestic ultraviolet light-emitting diodes to achieve the band of the solar blind zone

In addition, the use of ultraviolet light-emitting diode arrays can increase the emission power of ultraviolet light to a certain extent, but when the modulation frequency is large, reaching MHz, since the ultraviolet LED array is packaged by combining multiple LEDs in series and parallel, the junction capacitance becomes larger, the frequency response becomes worse with the increase of the modulation rate, resulting in distortion

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