The laser in the band of 355 nm and 266 nm can be produced by 1 064 nm YAG laser through nonlinear optical frequency conversion mode. High reflection from double bands must be met by the mirror operating in the system. According to film design theory, the appropriate coating material is chosen. Based on electron beam ion assisted deposition (IAD) technology, through optimizing parameters and repeating tests, the double band mirror is manufactured on quartz substrate, the reflectivity is 97.9% at 355 nm and 96.8% at 266 nm, the laser induce damage threshold (LIDT) is 1.76 J/cm2 at 355 nm and 1.12 J/cm2 at 266 nm ultraviolet band. Test results show that all the characteristics of the mirror accord with operation requirements.

Diffraction lens is used in Cassegrain infrared optical system. The design results show that the field of view and relative aperture of the system are increased to improve imaging quality. And the processing technology requirements are reduced to save the cost greatly.

The degradation of imaging quality of an infrared optical system is caused by the changing of environment temperature. Based on the differences in optical material thermal characteristics, a design method of long-wavelength infrared telephoto objective with optical temperature compensation is researched. Firstly, equations containing parameters are established according to the basic structure of telephoto objective and telephoto ratio. And then, the former group is complicated with different material combinations and the equations of athermal and achromatic to obtain initial optical power distribution. Finally, ZEMAX optical design software is used to optimize and correct aberration. Parameters of the design example are obtained such as 100 mm focal length, 2.0 F number, 0.8 telephoto ratio and 6° field of view (FOV). The result shows that the system has stable imaging quality in -40~60 ℃ operation temperature range, focal length variation is less than minimum depth of focus of the system and imaging quality approaches diffraction limit.

In the field test, long-ranged laser spot detection and spot image energy distribution are difficulties for testing. According to the problem, new spot detection measure and image display methods are proposed. Based on the research on light spot detection technology and different application background requirements, a new external trigger synchronous light spot detection control mode is proposed to improve detection precision of light spot image and target directional precision of laser irradiator. On the laser spot image display, through the research on light spot image processing technology, the capabilities of image parameter solution and 3D power distribution display of light spot image are enhanced further to provide references for laser irradiator beam quality analysis.

A multimode interference basic theory of singlemode-mutlimode-singlemode (SMS) is described. Numerical simulation is performed to multimode fiber with graded-index and step-index using finite difference-beam propagation method (FD-BPM). Features such as self-focusing location and exciting mode are compared to show the advantages of multimode fiber with graded-index. According to self-focusing effect, focusing and diverging functions of multimode fiber with graded-index are analyzed on theory. The shorter fiber is used in lens and the main applications at present are summarized.

The encoding structures of on-off keying (OOK), pulse position modulation (PPM), differential pulse position modulation (DPPM) and digital pulse interval modulation (DPIM) are analyzed in detail. And modulation modes are simulated and compared from bandwidth requirements, average transmission power, transmission capacity and error performance. The results show that DPIM has higher transmission capacity, less bandwidth requirements, lower synchronous requirements at the condition of demodulating and easier to be realized comparing with PPM. And with UV LED array, it will be the development trends of applicable UV light source. DPIM has more advantages?in the?application of?UV communication system?in the future.

Excessive segmentation is easily caused by traditional watershed transform image segmentation method and it is disadvantaged to image analysis and processing at the post stage. A method incorporating with watershed transform and region feature merging is adopted. Firstly, the original image is transformed morphologically to get gradient image. Then watershed transform is performed and the operated result is regional merged based on region texture, gray level consistency and region smoothness. And the segmentation result is got finally. Experimental results show that the method is feasible and effective comparing with traditional watershed transform method and excessive segmentation due to noise and light-to-dark texture is reduced effectively.

An image processing platform with digital signal processor (DSP) as a key part and field-programmable gate array (FPGA) as an auxiliary part for data acquisition and transmission is designed. Complex image processing algorithms are operated in DSP and data are transmitted at high speed via external memory interface (EMIF) and FPGA. EMIF is expanded to integrate image sensors, synchronous dynamic random access memory (SDRAM) and USB interface with EMIF so as to enhance the integration and flexibility of the system. And accuracy, high efficient and reliable data transmission between DSP and FPGA as well as external equipments is realized. Experiments show that the real time design requirements are met and the system has higher universality and easy to be expanded and upgraded.

According to the characteristics of high resolution remote sensing spectral images, a classification algorithm with texture and spectral information is described. Traditional local binary patterns variance (LBPV) is improved to apply in land-cover classification of high resolution images. The results show that LBPV has better spatial continuity and higher classification accuracy.

A reliability design method for embedded system serial communication receiving processing is described. The layer concept of ISO model is introduced. A modularization programming architecture is built by defining generalized frame format. Based on this, three cycle truncation methods and a new ring buffer parameters building mode are proposed to enhance the closed-loop reliability of the ring buffer. The unexpected failure occurred in communication is suppressed and the fault-tolerant features are enhanced using timing and logic monitoring method. The software has better adaptability, transplantation and easy to be maintained and tested.

According to the requirements of electronic equipment test, system openability and expansibility, an automatic test system based on PCI extensions for instrumentation (PXI) bus is developed. Hardware structures and software design methods of the system are described in detail. PXI embedded main control computer is used as the key part in the system and LabVIEW software is used as development environment. And the integrated design of the system is realized with standard interface and bus technology. The system has good man-machine interaction interface. It is stable and responsible in operation with high testing efficiency. And it is easy to be used and maintained.

From several aspects such as printed circuit board (PCB), grounding, shielding and filtering, the design measures to suppress the electric field radiation from electric equipments are introduced. With engineering examples, the issues radiation standard exceeding limit in tests are analyzed. The filtering principle of ferrite bead in the improved design is introduced in detail. The design method to choose appropriate ferrite bead based on tests data is proposed. The tests results show that the academic analysis is reasonable and the design measures are effective.

The closed-loop control of system position and speed is realized by co-operating of photoelectric shaft encoder, CPU board, I/O interface board and serial port board in a servo system. When there is a failure in any parts of photoelectric shaft encoder channel, the entire system will be paralyzed. A test equipment is designed to locate the failure point quickly. It is important to debugging operation, especially when there is a failure in the servo system operated in field environment, the failure can be located and solved quickly, which has stronger practicability.

The hypothermia phenomenons on body surface and hypothermia therapy control platform are introduced. MSP430 microprocessor is taken as a key control part, upper computer and thin film transistor (TFT) LCD touch screen as operation display interface and variable parameter prediction proportion integral derivative (PID) based on ant colony algorithm as key algorithm. Neural network is taken as prediction models and the control parameter of PID is optimized on line using the global optimization ability of ant colony algorithm to monitor the temperature of human body in real time. Experimental results show that unit step response overshoot and adjustment time are drastically reduced, dynamics and stability has been significantly improved and the surface temperature of human body can be stabilized accurately and rapidly in the range of requirements processed by the algorithm.

A mixed-language programming full automatic laser Z-scan measurement system based on LabVIEW and MATLAB is designed to express nonlinear optical features of samples. Full automatic control of experimental system measurement is realized using LabVIEW2012 development platform. MATLAB data analysis program is directly called through MATLAB Script node in LabVIEW environment so as to fit experimental data automatically and the nonlinear optical coefficient is obtained directly. Based on the calibration test of standard sample CS2, the measured third-order nonlinear refraction coefficient accords with the reported data, and the measurement process is rapid. Experimental results show that the complex manual operation is simplified by the system, automatic measurement of Z-scan system and integration of data processing are realized successfully. And the accuracy and efficiency of the measurement are improved.

In traditional photonic Doppler velocimetry system, velocity information is generally obtained by off-line processing. The processing cycle is so long that the sensing system can’t be used in real time. From the principle of photonic Doppler velocimetry system, with the graphical language design of LabVIEW and the powerful numerical processing capacity of Matlab, using data acquisition cards and PC as acquisition and processing platforms, a signal acquisition and processing system is proposed and designed. The real-time data acquisition, on-line processing and display of velocimetry signal are realized.

Twyman optical circuit structure and LED light source are used in white light three-dimensional interferometry. The reconstruction algorithms of interference images and component surface are simulated. Using Matlab software, two kinds of surface structure functions are chosen to simulate the reconstructed surface and choose five reference points to compare. Research results show that white interferometry has high accuracy, short measurement time and relative error is less than 0.5%.

Turret race is a key component of a tracked vehicle. The dynamic response problem of turret race sub-system is analyzed and researched based on contact dynamics theory. Firstly, with finite element and multi-bodies dynamics analysis technology, a rigid-flexible mixture model of surface flexible down turret race in the vehicle is constructed. Considering the dynamic contact relationship between turret race and balls in turret race sub-system, bounding box method is adopted to detect the contact state among upper turret race, balls and down turret race. According to Hertz contact theory, a nonlinear spring-damper model is established to calculate contact force. And then, taking the turret race dynamic response analysis under typical operation state as an example, the dynamic simulation analysis of the vehicle prototype is accomplished to obtain stress distribution and variation of the flexible down turret race.

Based on the calculation of labyrinth seal leakage rate, the factors influencing the leakage rate are described. Three characteristics such as seal profile, throttling gap and number are analyzed respectively. The results show that round profile is avoided for higher leakage rate. Better seal effect is got to choose a smaller seal value for throttling gap changing linearly with leakage rate. The more is throttling number, the fewer is leakage rate. But with the increasing of throttling number, throttling effect is not better and the economic cost is higher. So the appropriate throttling number is needed to be chosen in the design. Experimental results show that engineering application demands are met by electro-optical turret labyrinth seal design.

A laboratory test method for the point target ranging in space using infrared imaging system is described. The signal-to-noise ratio (SNR) definition of point targets images described by gray level, the radiation characteristics of point targets in space and the background, target search algorithm and illumination equivalence principle are introduced. The building method of testing equipments and the choosing principle of the parameters are described in detail. And the calculation example of relative parameters is given.