In this paper, the laser-induced fluorescence (LIF) technology is utilized for rapid assessment of the purity of quartz glass, especially for the screening of high-purity quartz glass. A 355 nm laser was applied as excitation source to induce the fluorescence signal of the quartz glass samples. The fluorescence signal is then transmitted to the spectrometer through an optical fiber for spectral acquisition. Because only the impurities in quartz glass induce fluorescence, purity quartz glasses does not have a distinct fluorescence signals or fluorescence peaks. The purity evaluation of high-purity quartz glass can be achieved by analyzing the obtained signals. The standard deviation and the ratio of the maximum to minimum values of the signals were calculated to indicate the intensity of the fluorescent peak of the signal. The thresholds were then set to distinguish between high-purity and low-purity quartz glasses. The method has the advantages of high speed, high precision and high reliability, and is of great significance for the rapid screening of quartz glass with high purity requirements.
A semi-active laser/active radar/infrared imaging tri-mode common aperture compound optical system is proposed, which adopts the compound structure of parabolic antenna and Cassegrain optical system. The three detection methods share a primary mirror ,which implement the separation of the infrared energy and laser energy and microwave energy in the secondary mirror; in order to reduce the blocking of microwave transmission by laser detection, using special design, the laser light spot is split into four parts, using of right-angle reflection optical waveguide, to placed in four separation unit quadrants which are located at the edge of the center of the optical axis at a distance 90° radar feeds are located in front of the optical waveguides which are connected with transmitters and receivers in the electronics bay by microwaveguides. This optical structure has high utilization of aperture and compact structure, and can effectively realize the combination of the three methods of detection and guidance modes.
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