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Research On Coherent Diffraction Grating Laser Detection Technology

Posted on:2015-03-26Degree:MasterType:Thesis
Country:ChinaCandidate:Y F HuangFull Text:PDF
GTID:2268330428459021Subject:Precision instruments and machinery
Abstract/Summary:PDF Full Text Request
The rapid development of laser technology, makes it play an increasingly important rolein modern war. In response to the growing threat of laser, all of the countries are devoted inthe study of laser detection warning technology. How to get the laser’s azimuth angle andwavelength rapidly and accurately is the key point of the laser warning technology research.Various methods of laser detection warning technology are introduced in this paper. Throughthe comparison, the grating diffraction laser alarm device is selected as the research object.The working principle of the grating diffraction laser alarm device is introduced in thispaper. Under the condition of the lens focal length is known, the laser’s azimuth angle andwavelength can be determined through the position of the zero level and the one leveldiffraction dots. The calculation formula is also deduced. The InGaAs focal plane array, withthe type of FPA-320x256-C is selected as the detector of the laser alarm device. The hardwarecircuit is designed with the construction of FPGAand DSP. The FPGA is responsible to driveand control the detector. And the DSP is responsible for data processing. They are connectedthrough the EMIF interface. In order to verify the detector’s image quality, the USB2.0interface circuit is designed. The FPGAcontrol program used for driving the detector and theUSB chip CY7C68013’s firmware program are completed in the software part. In thecomputer side, the USB driver program is designed by using the NI-VISA technology. TheLabview application receives and shows the data.At last, the experiments are carried out to verify the detector’s imaging effect. By usingthe laser with the wavelength of1319nm from different incidence angles, the diffractionimages are detected. According to the imaging light intensity, the location of the zero leveland the one level dots can be judged out. And then the laser’s azimuth angle and wavelengthare calculated. The results show that it is feasible to determine the laser’s azimuth angle andwavelength through the position of the zero level and the one level diffraction dots.
Keywords/Search Tags:Laser warning, Focalplane array, FPGA, DSP, USB, Labview
PDF Full Text Request
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