Missile warning satellite is an important part of space warning system. The development of space-based infrared missile warning technology of America such as defense support plan (DSP), space-based infrared satellite (SBIRS) and next generation overhead persistent infrared program (Next-Gen OPIR) is introduced. The operation system, performance parameters and technology characteristics of mid-infrared optical load in space-based infrared system are analyzed. And the operation mode of the space-based infrared warning system is analyzed. The development trend of space-based missile warning technology such as high and low orbit satellite networking, multi-band, long line array, large format detection and elastic system construction is proposed.

Real-time monitoring of laser output power is a very important problem in laser application. The relationship between stray light and laser output power in semiconductor laser is researched. Based on this, a real-time monitoring system of laser output power is designed. The stray light signal and the laser stack are monitored. Through the various and comparison of the signals, the semiconductor laser stack and some optical elements in the laser are monitored.

According to the influence on the low recognition rate of steel plate defect detection for uneven illumination, the algorithm of steel plate defect detection based on image processing is proposed. Based on image enhancement, image filtering and de-noising are performed, and image detailed features are retained. Image segmentation is realized by OSTU algorithm. The geometric features of steel plate defect images such as perimeter, area and width are effectively extracted, classified and recognized based on neural network. Experimental results show that the recognition accuracy of the proposed steel plate defect detection method is improved.

The possible harm of high intensity radiated field (HIRF) to airborne decoy in complex electromagnetic environment is analyzed. Through experiment verification, the sensitive frequency of the airborne decoy under HIRF environment is a single and fixed frequency. And the influence of HIRF on the safety of the airborne decoy under the condition of electrification and non-electrification of the dispensing equipment circuit is verified by experiments. Several measures to improve the safety of the airborne decoy are put forward.

Image fusion as an important branch of image processing field, has become one of the hot research issue. For pixel level image fusion, multi-scale and multi-resolution decomposition has been widely used. The low-frequency sub-band fusion method based on regional energy is proposed for the problems of fusion image fuzzy and contrast reduction from average method. For high-frequency sub-band, for considering the coefficient itself, the impact of regional coefficient is also considered. The registered visible and infrared images are fused and the fused images are evaluated. Experimental results show that while retaining the image outline, the high-frequency edge and details of the images are also fully retained.

With the progress of science and technology, the algorithm of neural network is gradually improved, and its structure and functions are constantly developing. It has widely application, especially in the field of optoelectronic information. In order to adapt to the deepening trend of neural network and popularize the subject knowledge of neural network, the concept and types of neural network and classical BP neural network algorithm are introduced. The advantages and disadvantages of different kinds of neural network algorithms and their applications in the field of optoelectronic technology are analyzed, which provides some theoretical guidance for the scientific and technological personnel in the field of optoelectronics.

High or low temperature and humidity will stop or slow down the growth of crops in agricultural greenhouses. Therefore, it is crucial to keep temperature and humidity within the suitable range for crop growth. Automatic temperature and humidity collection monitoring mode should be adopted in the modern agricultural greenhouses to regulate the temperature and humidity of agricultural greenhouses, in order to adapt to large-scale production. The whole system consists of MCU and its peripheral circuit as well as wireless transmission module. The MCU and its peripheral circuit are mainly composed of MCU, temperature and humidity sensors and human-computer interaction. The temperature and humidity data are collected by temperature and humidity sensors and processed by MCU, and then are transmitted to the host through 433 MHz wireless module, so the machine equipment is controlled by the host.

The jamming mechanism of typical shipborne passive jamming material is introduced. A conceptual model of passive jamming scattering characteristic and jamming efficiency based on system particle theory is designed combined with the influence research on the complex electromagnetic environment of sea surface. The particle system theory is used to simulate the analysis of dipole-like interferences. The dynamic model building process and the scattering model of passive interferences are designed. The scattering characteristics of dipole-like interferences are analyzed by differential equation, integral equation method and vector transport theory and the conceptual model is established. The simulation results of the scattering characteristics of passive jamming material are given through simulation analysis, which provide theoretical supports for the interference technology of shipboard passive jamming material under complex electromagnetic environment.

In order to develop new reciprocating compressors, on the basis of the laboratory multi-functional combined mechanism reciprocating compressor test bench, a reciprocating compressor remote monitoring system based on S7-300 PLC and WinCC configuration software is designed. The monitoring system has more versatile for automatically adapting to piston ring compressors and labyrinth compressors. The structure design of the test bench and its monitoring system and the hardware and software design of the monitoring system are introduced in detail. The actual operation results show that the monitoring system can realize the single-item or comprehensive technical experiments and fault conditions of the remote monitoring multi-functional combined mechanism reciprocating compressor test bench under different thermodynamic parameter conditions. Under a steadily work state, the use efficiency of the reciprocating compressor is improved greatly, the degree of automation is increased, which provides a technical reference for the development of new compressors.

Low-speed two-sided dynamic balancing and the first order static dynamic balancing are combined in the system, which can realize fast and high efficient dynamic balancing of the multi-stage pump rotor. At first, the acquisition of vibration signals is completed by a dual-channel dynamic balancing machine. And then, the acquisition signals are transmitted to the host computer. At last, based on the new algorithm compiling, the acquisition signals are processed using Visual Basic software to calculate the influence coefficients, and then the imbalance value and the phase angle are tested.

Aiming at the requirements of the rotational speed measurement of closed rotating machinery, a rotating speed test method based on vibration analysis is proposed. Due to the uneven distribution of the mechanical rotor mass, the rotor will inevitably produce a simple harmonic motion during the rotation process. And the frequency of the vibration is equal to the frequency of the rotor rotation, thereby converting the measurement of the rotor rotating speed to the frequency measurement of the rotor vibration. The vibration test sensor is used to pick up the mechanical vibration signal, and the vibration signal is converted into a voltage signal with a certain intensity through the signal conditioning circuit, and the voltage signal is collected and transmitted to the computer for processing by the AD data acquisition module. The Visual Basic 6.0 software platform is used to write the rotating speed test system based on the minimum condition system identification theory, and the collected vibration data is processed to calculate the rotational speed of the closed rotating machine. The software design flow chart with the speed test system is attached, and the field test experiment is carried out to analyze the feasibility and error of the test system.

The thermal characteristics of the spindle system of vertical machining center become one of the main factors affecting its machining accuracy. It is particularly important to analyze the thermal characteristics of the spindle system of the vertical machining centers. VMC850E vertical machining center is researched. The API spindle thermal drift error analyzer, advanced capacitive or inductance sensors and contact temperature sensors are used to analyze the relationship between spindle temperature rise and thermal drift. The experimental results show that the radial and axial thermal drift of the spindle increases at the temperature rising stage, and the Y-axis thermal drift is the largest. The thermal drift in all directions decreases at first and then increases. In the process of processing, the requirements of the lubrication and cooling of the spindle are higher.

The atmospheric structure constant of refractive index [ C2n] is an important parameter of atmospheric optical turbulence intensity. The atmospheric coherence length of the winter horizontal path in some region is measured using the atmospheric coherence meter. In the case of approximate weak fluctuation condition, considered the average turbulence effect on the path, the relation formula between the atmospheric coherence length and [ C2n] is deduced. The profile and daily variation characteristics of[ C2n] are obtained by statistical analyzing for experimental data of winter horizontal in the region, and structure characteristics of atmospheric turbulence in the region are known clearly. The best time window for laser transmission is found by statistical results.

According to working conditions and the requirements of better mechanical and vibration isolation properties, the structure design scheme of a vehicular optical platform is established. Static and modal analysis of the platform is performed by ANSYS to obtain static strain and vibration mode, and the optimum design is performed. The vehicular optical platform is tested on the vehicles, and the results show that the simulation results of ANSYS are close to the testing results. It is shown that the vehicular platform has better stability to ensure stable working state of the high precise optical system.

According to the advantages of the space crank rocker mechanism, the feasibility of applying it to the driving mechanism of the flapping wing aircraft is studied and analyzed. Based on the traditional graphic method, the mathematical model of the drive mechanism is established, and the size of the mechanism is determined by considering the convenient installation and compact structure. The virtual prototype is built for simulation analysis to verify the correctness of the theoretical design. The results show that the drive mechanism can be used as the driving mechanism of the flapping wing aircraft.

The bed is the key supporting component of the CNC lathe. Its static and dynamic characteristics affect the machining accuracy and stability of the lathe directly. For the HTC3650 horizontal CNC lathe produced by Shenyang Machine Tool Group, three-dimensional model is built by UG software, and then imported into Ansys workbench finite element analysis software to establish the finite element model of the lathe bed. Static and modal analysis of the lathe bed is carried out to identify the total deformation and the first four natural frequencies of the lathe bed. According to the simulation analysis results, the target drive optimization method is used to optimize the size parameters of the lathe bed, improve the first four natural frequencies of the bed structure, reduce the deformation of the bed and improve the dynamic and static characteristics of the bed.