Showing papers in "Electro-Optic Technology Application in 2015"
Journal Article•
TL;DR: Based on the introduction of sensing principles of short-period fiber Bragg grating (FBG), the research progress of two refractive index sensing technology schemes such as etching and polishing methods are described in detail.
Abstract: Based on the introduction of sensing principles of short-period fiber Bragg grating(FBG) and micronano fiber Bragg grating(MNFBG) refractive index and how to improve FBG refractive index sensing sensitivity, the research progress of two refractive index sensing technology schemes such as etching and polishing methods are described in detail. The advantages and disadvantages of the two schemes are compared and analyzed. The research status of micro-nano fiber and fiber grating used in refractive index sensing is summarized. The technology problems and solution schemes on current research are proposed and the development trend of FBG refractive index sensing technology is forecasted, which provide a reference for further research on refractive index sensing based on fiber grating devices.
2 citations
Journal Article•
TL;DR: In this paper, the spectrum characteristics in THz of green and yellow smoke screen materi-als are researched respectively to obtain the refractive index and shielding effect curves of the two materials.
Abstract: A transmission THz time domain spectrum system experimental device and the extraction methodof related parameters are introduced. The spectrum characteristics in THz of green and yellow smoke screen materi-als are researched respectively to obtain the refractive index and shielding effect curves of the two materials. Experi-mental results show that the two materials have better shielding effect in visible and Infrared band, but has poorshielding effect in THz band. THz wave reconnaissance and detection has strong anti-jamming ability, which canmake up the shortcomings of traditional visible and Infrared detection systems.
1 citations
Journal Article•
TL;DR: In this paper, the focusing adjustment formulas of plane wave, spherical wave and Gaussian beam from laser optical transmitting system were deduced based on simple physical model and matrix optical method, and focusing adjustment properties of the three kinds of waves were calculated and analyzed.
Abstract: Based on simple physical model and matrix optical method, the focusing adjustment formulas of plane wave, spherical wave and Gaussian beam from laser optical transmitting system are deduced And the focusing adjustment properties of the three kinds of waves are calculated and analyzed During plane wave focusing adjustment, with the decreasing of focusing adjustment quantity absolute value, focusing distance increases When fo-cusing adjustment quantity closes to zero, the increasing speed of fo cusing distance is faster During spherical wave focusing, collimation emission status with infinity focusing distance exists The emission wave beam becomes divergent if focusing adjustment quantity is over the values corresponding to the state At the same time, with the increasing of the distance between spherical wave curvature center and secondary mirror, the focusing adjustment quantity corresponding to collimating emission state move right and close to zero During Gaussian beam focusing and with same focusing adjustment quantity, there is an obvious difference between Gaussian beam waist and plane wave focus position in far distance The difference can be reduced through increasing the waist width of incoming Gaussian beam and the expanded beam ratio of laser optical transmitting system and choosing shorter wavelength optical beam
1 citations
Journal Article•
TL;DR: Wang et al. as discussed by the authors proposed an adaptive regularization reconstruc-tion algorithm for image local texture feature, and based on gray level co-occurrence matrix(GLCM), the image localtexture feature is extracted, the function relationship of regularization parameters and image local-texture feature was established, so regularization parameter λ is adjusted adaptively according to imagelocal texturefeature.
Abstract: In bilateral total variation regularization method(BTV), considering geometric distance and graylevel similarity of the center pixel and the surrounding pixels, the method to get better reconstruction quality thanTikhonov regularization method and total variation regularization method(TV) is obtained. However, in BTV meth-od, the regularization parameter λ is a fixed value, so the method cannot maintain the image edge texture informa-tion and suppress image noise at the same time. In order to solve this problem, an adaptive regularization reconstruc-tion algorithm for image local texture feature is proposed, and based on gray level co-occurrence matrix(GLCM),the image local texture feature is extracted, the function relationship of regularization parameters and image localtexture feature is established, so regularization parameter λ is adjusted adaptively according to image local texturefeature. The experimental results show that compared with BTV, this algorithm can better reconstruct the imageedge texture details and suppress the noise effectively.
1 citations
Journal Article•
TL;DR: In this article, the spectral performances and photo-stability of chlorophyll are mainly investigated, and the spectral performance and photo stability of the active pigments are analyzed through the spectral characteristic and photostability.
Abstract: The spectral performances and the photo-stability of the active pigments of chlorophyll are mainlyresearched. According to the pigment in green plants, the characteristics of chlorophyll and its degradation factorsare analyzed, and then chlorophyll derivatives are prepared by replacing Mg2 +in natural chlorophyll with the metalions of Cu2+and Zn2+, furthermore their characteristics are analyzed comparatively through the spectral characteristicand photo-stability. Research results show that Cu chlorophyll is more suitable as the target of chlorophyll modify-ing to improve the stability of the pigments from considering spectral characteristic and photo-stability together.Thus it provides material basis for the preparation of new optical camouflage paint.
1 citations