A large mode area fiber with step index core and inner microstructure cladding is proposed. By using step index core and inner microstructure cladding formed by high doped rods with a ring array, the contradictory constraints of large mode field area and single mode in traditional structure can be effectively solved. Furthermore, high bend loss and sensitivity to bend orientation are also eliminated. The optimization of fiber properties are carried out by using full-vector finite element model with perfectly matched layer. Research results show that large mode area reaches up to 1 412 μm2 and the loss ratio of high-order mode to fundamental mode is up to 767 at the wavelength of 2 μm when the fiber is bent at the bend radius of 10 cm. In addition, fiber properties are independent of bend orientation. Due to its advantage of large mode area, excellent single mode, low bend loss and insensitivity to bend orientation, the proposed fiber is of great significance to promote the development of high power miniaturized fiber lasers.

The effects on different channels of multichannel cameras are obtained by irradiation experiments of the multichannel camera induced by using super-continuum fs laser. Through researching on the operation principle of the multichannel camera, the effects on the camera induced by super-continuum fs laser and single wavelength laser are compared. The results show that the super-continuum fs-laser has better interference effect than the single-wavelength laser.

The rule of germanium material temperature changing with incident laser power density and irradiated time under spectral unrelated laser irradiating is obtained, and the radiation characteristics of infrared detecting systems are influenced with the material temperature rise. The experimental results of germanium material characteristic changing irradiated by spectral unrelated laser are analyzed, which indicates that germanium material transmissivity will be reduced for material temperature rise, and the performances of the detecting system are influenced. The study will be used for improving of the design and application of infrared systems.

Based on the theories of infrared radiation, radar absorption and scattering, combined with the presented situations of the composite passive jamming materials, a new three-dimensional radar passive jamming material coated with radar transparent infrared low emissivity material is proposed. Based on the non-combustible characteristics of the infrared coating material, the three-dimensional passive jamming material falling cannot be burned on the ground. And through researching on the matching of the jamming performance of the infrared and radar bands of the composite coatings, as well as the multi-shape reflection and absorption characteristics of the passive jamming material, the theoretical simulation and experimental tests are carried to provide theory and data supports for the infrared shielding and radar band scattering characteristics of the three-dimensional radar passive jamming material coated with radar transparent infrared low emissivity material.

The thermoplastic characteristics of MTV pellet are analyzed under high temperature and vibration. And the simulation is carried out, combined with the simulation results, the working adaptability of the pellet under the condition of high temperature and vibration is analyzed. The verification test is carried out after improving the structure and processing design.

Modern integrated optical instruments often have many functions, the working bands of optical systems may cover ultraviolet, visible, glimmering, near infrared, shortwave infrared, even mid-infrared and far-infrared wavebands. Such optical systems are often more complex, containing more types of optical parts, there is loss of light energy in the mirror and severe stray light, which results in lower brightness, contrast and image resolution. In order to obtain good optical system performances, ultra-wideband antireflection coating is needed on the surface of the optical parts. This film system usually needs more layers and combinations of many kinds of film materials, the design and deposition are very difficult. A kind of ultra-wideband antireflection film designed with passband expansion method is proposed. Two kinds of material combination such as Ta2O5 and SiO2 are selected to obtain antireflection effect at ultra-wideband, so we can get the Rave is less than 1.6% at 0.42～0.9 μm, Rave is less than 1% at 1.064±0.01 μm and Rave is less than 1% at 1.57±0.01 μm. The quality of the desposition film meets JB/T8226.1-1999 standards.

Aiming at the drawback of the classical total variation (TV) de-noising model in which the staircase effect is often produced, an image de-noising model based on improved second order total generalized variation (TGV) is proposed. In the new model, the image texture information extracted by Kirsch edge detection operator is used to introduce an edge indicator function to guide diffusion in the regularization term of second order TGV. The experiment shows that compared with the classical TV de-noising model and the second-order TGV de-noising model, the new model has obvious improvement in both visual effect, peak signal-to-noise ratio (PSNR) and mean square error (MSE), which can remove the noise effectively while protecting image edge information and fine texture structure information adaptively.

Optical Frequency-Domain Reflectometry (OFDR) is appropriate for the measurement of rapid changing micro space quickly and high-accuracy especially for the turbine blade tip clearance. The principle of OFDR measurement system is analyzed and the real time demodulation algorithm of spectral interferometry signal is designed. Demodulating, displaying and controlling of the signals in real time from the measurement system are realized based on LABVIEW data flow diagram. Experiments show that the algorithm and LABVIEW platform function are reliable and available for engineering application.

Direct current (DC) motor has the advantages of large range speed regulation, large starting torque and easy to stop, especially suitable for high speed regulation requirements. Under the condition of load change, traditional proportional-integral (PI) algorithm DC speed regulation control needs to adjust the parameters, which is difficult to be adaptive. Aiming at this problem, a fuzzy adaptive PI controller is designed, which can perform fuzzy reasoning by identifying errors and error changes to realize the online control parameters setting and the optimal control. At the same time, Matlab is used to fit experimental data, the results show that the fuzzy PI control algorithm can much more effectively improve system dynamic and steady-state performances than the traditional PI control algorithm.

Phase extraction of an interference fringe pattern is an important part of interferometry. The phase features of interference fringe patterns are extracted by combining phase-shifting and two-dimensional continuous wavelet transform algorithms. In this method, by combining the virtues of these two algorithms and using wavelet ridge algorithm, the phase features of fringe patterns are obtained rapidly and accurately. Through MATLAB simulation platform, the experimental results show that the signal to noise ratio obtaining by the algorithm has a great improvement comparing with traditional algorithms, and the effectiveness of phase features extraction of interference fringe patterns is proved.

Comparing with binary low-density parity-check (LDPC) codes, non-binary codes really have some advantages, but its high complexity decoding is a big challenge for implementation. For resolving the problem, the proportional logic truncation mechanism algorithm based on iterative soft-reliability is proposed because the algorithm only involves finite field addition, multiplication and integer operations, and it can divide variable nodes into processing and non-processing nodes. Only some of the variable nodes participate in the actual information processing in the iterative process, so the algorithm has lower decoding complexity than other algorithms. Comparing with ISRB, IISRB and RS-IISRB algorithms through simulation experiments, the proposed algorithm has better performance. It has widely application in radio and optical communication for its good error-correcting performance and low complexity.

According to the modeling requirements of electro-optical information systems in joint operations, multi-resolution modeling (MRM) technology for resolving complex system modeling is researched, and the multi-resolution model of the electro-optical information system is built. At first, the typical MRM method is introduced. And then, the MRM design using entity-oriented aggregation and disaggregation method is proposed based on the analysis of the function procedures of the electro-optical information system. At last, the MRM principle is described, the two-layer multi-resolution model including the equipment layer and the system layer is established, and the consistency of the multi-resolution model is discussed.

The research on the action mechanism of target material irradiated by pulsed laser has the important scientific significance and potential application in the industrial fields, such as laser processing. In order to visualize the damage advantage of pulsed laser on target material, the influence of target material itself and incident laser on the destructive effect of the laser irradiation target material is considered, and the process of laser irradiated target material is simulated by the finite volume method. The action mechanism of pulsed laser and material is focused on, and the mathematical model is established. In addition, the temperature field and action process of three different forms of pulsed laser on target material have been obtained. The experimental results show that pulsed laser irradiation target material can be divided into three stages such as heating up, melting hole and increase of deep diameter ratio of molten hole. Furthermore, the repeated frequency pulsed laser has greater damage to target material than intermittent pulsed laser.

Aiming at the problem of robot pose measurement under certain working conditions, a simple pose measurement system based on monocular vision is studied and designed, and an accurate target detection algorithm combined with monocular vision measurement method is proposed to measure robot pose. At first, the coordinates of the target in the image are extracted by image preprocessing and target detection algorithm, in which the image preprocessing includes median filtering, edge detection and image morphological expansion. And then, the calibration of the measurement model is performed, and the model parameter is solved by least square method. The established measurement model is used to convert the coordinate system, and the two-dimensional pixel coordinates of the obtained target images are converted into three-dimensional world coordinates to obtain the pose of the target in the world coordinate system. At last, the accuracy and effectiveness of the method are proved by experiments, which meet the measurement requirements.

In order to make the aiming line aim at the target and make the image stable, the 1:2 transmission mechanism is used in the periscope upper reverse mirror system. The existing 1:2 transmission mechanisms are investigated and the advantages and disadvantages of these mechanisms are analyzed. On the basis of the existing structure, a new type of 1:2 transmission mechanism is designed. The designed new type of transmission mechanism is a rolling bearing three connecting rod mechanism, which is connected by the bearing between the swing rod and the rotor, and the sliding connection is transformed into a rolling connection. The friction torque is reduced as much as possible so as to achieve a better image stabilization effect. The experiment shows that the 1:2 transmission mechanism has simple structure, good reliability, good transmission stability, high precision and without the influence of temperature. It can achieve good transmission and stable accuracy.

The traditional method of measuring the parallelism of gun directional beam is investigated, and the shortcomings are presented briefly. A measurement method based on lidar of gun directional beam parallelism is proposed. Proved by the experiment, this method can reach the measurement accuracy of 0.2 mil, and the measurement with high precision and efficiency is realized.