In order to realize wavefront reconstruction over full aperture of aspheric surface at the beginning of polishing, a novel method combing coordinate measuring machine (CMM) and digital interferometer was proposed. The main part of surface is able to be measured by interferometer. The rest part, wavefront of which cannot be recovered by interferometer, can be measured by CMM. By combing the data from CMM and interferometer, the error of surface can be reconstructed and the wavefront over full aperture can be obtained ultimately. In the testing, wavefront of an off-axis aspheric surface with 540 mm diameter was successfully reconstructed over full aperture during the process from grinding to polishing. The availability of the method for wavefront reconstruction of aspheric surface was proved by the results.

The long time consumption is a bottleneck for the applicability of the ghost imaging (GI). By introducing a criterion for the convergence of GI, a factor was investigated that impacts on the convergence speed of it. Based on computer experiments, it’s demonstrated that the object’s feature size relative to the spatial coherent length of the illuminating light impacts on the necessary number of uncorrelated data being acquired for the correlation computation. It may motivate people to seek ways towards real-time practical applications of GI and its analogues. In addition, the method to simulate the uncorrelated sequence of a complex ensemble for thermal light is valuable in applications where actively controlling the light fields is needed.

Since there is lack of methodology to assess the performance of defogging method and the existing assessment methods have some limitations, a new objective quality assessment method for defogged images is proposed. For the halo artifacts, an edge-weighted structural similarity index is adopted to assign different weights to contour correlation and local texture correlation of the fog image and defogged image, which can represent the structural similarity. From the perspective of human visual perception, the normalized gray difference of defogged image is defined to describe the luminance of the image. Then, the fog image and defogged image are changed from RGB space to HSV space. Information entropy and histogram similarity of S component are used to assess the color performance of defogged image. Finally, with these three factors, a comprehensive image quality assessment model is established, which is used to make the objective evaluation and comparison. Experimental results demonstrate that the proposed method can achieve a consistent result with our subjective perception as well as obtain a good effectiveness and reliability.

In order to solve defect of the traditional wavelet transform, a novel image fusion algorithm based on patch-based directional wavelet was proposed. The image was divided into many patches, and the directional wavelet was obtained by training each patch, and then the sparse coefficients of input images were acquired by sparsely represented using the directional wavelet. The fused image was reconstructed by transforming the coefficients reversely, and the simulation experiment was used to test performance of the algorithm. The experimental results show that the proposed algorithm makes the image fusion transition effect more natural compared with the traditional algorithm such as DTC, FFT and DWT. Because it’s image fusion quality evaluation indexes are better in the information entropy and the average gradient. At the same time, the image fusion is faster and it can meet the demand of real-time image processing system.

Proxy blind signature was widely applied to electronic voting, electronic commerce, and other network settings. Considering the comprehensive factors of the communication cost, quantum operation complexity, verification efficiency, an efficient quantum proxy blind signature scheme based on the correlation of W states was proposed, in which the owner blinds the secret first and then the proxy signer signs the blinded message after authorized. The best advantage of this scheme is that it only needs single-particle measurements in the signature, not any quantum unitary operation. In addition, the proposed scheme obtains the higher efficiency in the signature verification and classical communication, compared with the other current well-known scheme.

The intercept-resent eavesdropping was explored in the polarization-drift quantum cryptography. Two-dimension model was used to describe the key distribution process. Model analysis and calculation provide precise relation between legitimate communicators and eavesdroppers. The loss of detection efficiency and fluctuation of QBER were obtained. The mutual information in the sifted keys shows that, comparing to BB84 protocol, the mutual information in B92 protocol is lower, which is caused by the simplified states from four states to two states. The information obtained by an eavesdropper can be more than that in the legitimate partners, which will threaten the privacy of the keys generated.

Quantum communication is one of the most important branches of quantum information, which is the combination of quantum mechanics and information theory. The security of B92 quantum key distribution protocol was analyzed in the non-ideal circumstances. A new quantum circuit model of B92 quantum key distribution protocol was raised to design simulation models under different noise channel models using the QCircuit. Two indicators of BER and rsec were introduced, and then the circuit models were designed to simulate and analyze the effectiveness and security of B92 key distribution protocol under different noise channel models. The experimental results show the new circuit design achieves the purpose of B92 key distribution protocol and the design approach is more universal significant. It can be used to construct more quantum simulation models of different quantum key distribution protocols.

A five order symmetry chaotic circuit including memoristor was designed by adopting the method which memoristor replace the piecewise-linear resistance. Based on the four order chaotic circuit proposed by Matsumoto, Chua and Kobayashi (MCK), the model of five order memoristor circuit was built. Conventional dynamics analysis method was used to analyze the equilibrium point set, stability and Lyapunov exponent. Conventional components were used to build simulation model of five order memoristor chaotic circuit and carry out circuit simulation experiments. Theoretical analysis and simulation experimental results show that five order memoristor chaotic circuit designed has rich chaotic behavior, which widen the design and application of memoristor chaos circuit.

UV visible spectrum of several camphor type β-diketone ring platinum complexes and their third order nonlinear optical properties at B3LYP / 6-31++G(d, p) level (Pt atom basis set with LANL2DZ nucleus potential) was theoretically investigated. The results show that the electronic transitions of molecules are mixed with metal-to-ligand charge transfer (MLCT), ligand transition (LC) and ligand to ligand transition (LLCT). Given the introduction of －OC2 H5 molecule in benzene ring, both the strongest absorption peak and the lowest energy absorption peak occurr blue shift. The introduction of phenyl group to β-diketone ring and fluorinated alkyl group on the another ligand phenyl ring can increase nonlinear optical properties. The introduction of electrondrawing group －CF3 in β-diketone made the lowest energy absorption peak red shifts occured, and at the same time, the introduction of alkoxy on the phenyl ring in another ligand benzene ring can also increase the nonlinear optical properties.

The solitary wave coupled equations were solved numerically to study the characteristics of bright-dark soliton family. The steady-state solution and stability of soliton family supported by the combined action of the linear and quadratic electro-optic effects were analyzed. The results show that the total intensities of bright soliton components are slightly larger than that of dark soliton components in the bright-dark soliton family when the external bias field is positive and in this case, the nonlinearities result from the linear and quadratic electro-optic effects reinforce each other. When the external bias field is negative, the total intensities of bright soliton components are slightly smaller than that of dark soliton components in the bright-dark soliton family and the nonlinearities result from the linear and quadratic electro-optic effects either cancel out. Moreover, every component in bright-dark soliton family propagates stably.

Accurate measurement of fluid-velocity profile and flow rate in complex duct is important to master the velocity distribution law and its application. A scheme of measuring the fluid-velocity profile and flow rate in rectangular duct based on laser-diode self-mixing effect was proposed. Based on the self-mixing interference theory and velocity distribution of laminar flow in rectangular duct theory, the feature of frequency spectrum of self-mixing signal of laminar flow in rectangular duct was analyzed. The feature of fluid-velocity profile and flow rate in rectangular duct were obtained. The average relative error of measured fluid-velocity is 2.7%. The relative errors of measured flow rate in rectangular duct are less than 2.0%. Experimental measurements accord with the theory.

The temperature characteristics of avalanche voltage of single photon detector SPAD were analyzed. It’s concluded that the avalanche voltage of SPAD variation with temperature is about 0.7 V/°C. The constant temperature control circuit was designed to ensure the normal operation of SPAD. From the perspective of the optimal temperature control strategy, MAX1978 temperature control chip design circuit was chosen to realize the SPAD temperature constant. The working principle and main component of constant temperature control system were introduced. Through the experiment of constant temperature control circuit to verify the feasibility of the circuit, constant temperature control circuit can make the SPAD working environment temperature constant at 0.06°C in 1 minute, the speed and accuracy of temperature control can meet the requirement of SPAD temperature constant, and ensure the normal work of the single photon detector SPAD, so that the single photon detector SPAD has better performance.

Using atmospheric pressure nitrogen negative corona discharge electron attachment ion mobility spectrometry, the rate constants of electron attachment to CH2 Br2 , CH2 BrCl and CHBr3 were measured at ambient temperature as a function of average electron energy in the range from 0.35 eV to 0.65 eV. The rate constants for electron attachment to CH2 Br2 , CH2 BrCl, CHBr3 follow the relations of k(CH2 Br2 )>k(CH2 BrCl), k(CH2 Br2 )>k(CHBr3 ), and the relations between CH2 Br2 and CH2 BrCl are discussed in theory according to the electron affinity. In addition, the process of electron attachment to CHBr3 is firstly qualitative analyzed. It’s found that when the sample vapor is introduced into the drift region, the bromine ion will cluster with the molecule of CHBr3 to be Br-(H2 O)n (CHBr3 )m.

It is difficult to accurately realize the multi-component quantitative analysis simultaneously, when applying open path Fourier transform infrared spectroscopy (OP-FTIR) into the remote sensing of cloud cluster because of the existence of some unknown interference materials. Combined the standard spectrum addition with matrix projection operation and target transformation factor analysis, the unknown interference components can be identified and multi-component quantitative analysis was realized simultaneously. The mixed spectrum of SF6 , methanol and NH3 were simulated to predict the concentration of SF6 and methanol while NH3 was regarded as the interference component. The results and the real concentration path-length matched fairly well.

Based on the theory of Mie scattering and assumption of particle size distribution, lidar ratios and Angstr?m exponents of many kinds of aerosols were simulated for investigating the light scattering property of aerosols. The relationships between these two parameters and the wavelength of incident light, the size and refractive index of aerosols were researched. The simulation results show that the lidar ratios of water clouds and fog at 355 nm, 532 nm and 1064 nm are all approximately 19 sr. The absolute values of their Angstr?m exponents are very small, which reveals that there is no obvious dependency between extinction coefficient and wavelength. Due to the strong absorption of soot, the lidar ratios of continental aerosols are found to be positively correlated with the content of soot. The continental aerosols have the maximum lidar ratio at 532 nm. The mean value of Angstr?m coefficients is approximately 1.3, and their extinction coefficients decrease with increasing wavelength.

The influence of phonon dispersion on properties of the average optical phonon number of weak-coupling polaron in a parabolic quantum dot was studied by using the linear-combination operator and unitary transformation method. Taking account of the longitudinal optical (LO) phonons dispersion in a parabolic approximation, the ground state energy and average number of virtual phonons around the electron as a function of the coefficient of the phonon dispersion were obtained. Numerical calculation results show that the ground state energy decreases with increasing the coefficient of the phonon dispersion, and average number of virtual phonons around the electron increases with increasing the coefficient of phonon dispersion.

By analyzing the orbit characteristics of remote sensing satellites and ground tracks and taking the layout principle of communication satellite stations into consideration, an innovative way of planning ground stations for CBERS-4 based on available domestic and oversea stations at present was proposed. The method which can meet the time constraints and reduce the number of stations, is to arrange stations near the equator on the basis of the layout of stations in the South and North Pole by studying characteristics of ground track. The result of simulating test with STK shows that the method can provide important reference value for construction of the ground stations.