Single-mode laser Lorenz system is a typical nonlinear model, which shows extremely complex and richdynamic behaviors. It is very important to the research on characteristics. Based on a brief introduction of single-mode laser Lorenz system, which including model establishment, dynamic equations and relative system characteristics, theprogram is programmed by Matlab software and the phase maps of single-mode laser Lorenz system with different pa.rameters is simulated by a computer. With simulated images, dynamic behaviors of the system are analyzed and dis.cussed. The results show that when the parameter of the system is more than the value of a branch point, the system be.comes unstable and thus enters into a chaotic state.

According to the empirical relationship between the water content and visibility in radiation and ad. vection fog, the calculation formula of laser atmosphere transmission attenuation in fog weather is analyzed. Three kinds of commonly used fog attenuation empirical models are simulated by Matlab numerical value. The relation.ship between laser attenuation coefficient and visibility in fog weather is obtained. According to the shortcomings ofthree kinds of semi-empirical models, a new empirical formula containing some information such as measuring dis.tance and field of view of a receiver is proposed based on Mie scattering theory finally.

Aiming at the polarized light effect of different environment bubble group is degree of polarizationand backscattering light intensity，the simulation model using Monte Carlo method is built. In the simulation pro.cess, the motion process of photo in the group of bubble is fully considered. The difference of the characteristics ofthe backward scattering light intensity and the degree of polarization are compared and analyzed when the polarizedlight incident into the water in different bubble radius, bubble density and the width of bubbles. The feasibility ofwater bubbles in laser incident polarization detection method used in optical communication detection field is veri.fied and the application importance in this area is presented.

Based on Fourier transform optics, a method to improve coherent combination efficiency in paralleltransmission system is introduced. According to the knowledge of laser optics, the influence of the method on lasercoherent combination efficiency is calculated by numerical value simulation. Numerical simulation of the paralleltransmission system and the lens system shows that the method described in the passage indeed improve the effi.ciency, with limitation that equals the efficiency in lens system. Different initial phase schemes lead to different ef.fect, and the best scheme is got by comparing.

A multi-wavelength Brillouin fiber laser with ultra-narrow line-width bidirectional feedback is intro. duced. A 10 km long single-mode fiber (SMF) connected with a 2×2 3 dB coupler is used as the Brillouin gain ringand a distributed feedback (DFB) semiconductor laser is taken as the Brillouin pump (BP). The output and feedback ofmulti-wavelength lasers are realized by two optical circulators without adding erbium-doped fiber linear gain structure.At the Brillouin pump power of 80 mW, stimulated Brillouin scattering is produced in 10 km long single-mode fiber (SMF). Therefore, multi-order Stokes reflection lights can be obtained. Stokes light output of 12 wavelengths with 0.088 nm wavelength spacing and 300 kHz output laser line width is observed except BP.

For assisting a binocular visual system of a small robot to recognize and locate the targets in middledistance, a pinhole lens installed in narrow space such as mechanical arms is designed. The stop is located infront-end of pinhole lens, and a piece of mirror is added behind the stop to turn the optical path to 90°, so the mainoptical path of the lens is parallel to the surface of the aperture and the lens is easy to be fixed and installed. The fo.cal length of the periscopic aperture lens is 12 mm. Optical characteristic analysis results of the final design showthat the requirements can be met when MTF is at 110 lp/mm space frequency. And it is a high resolution aperturelens matching 720 p high resolution sensor.

The imaging system with large field of view, lightweight and small size is a developing direction of modern electro-optic detection equipments. A panoramic infrared night vision segmented by the four pathways andsmall diameter infrared lens is proposed. The implementation principle of the instrument is introduced. The systemis consisted of infrared objective lens, image segmented processor, organic light-emitting diode (OLED) micro-dis. play and infrared eye lens. Design parameters of the instrument are confirmed and a design example with 150° su.per-large field of view is presented.

Stereoscopic display technology can be classified as head type and nakedness-eye type according towhether viewers wear the equipment or not. Head type is classified as polarized glasses, color complementary glasses,shutter glasses and helmet. Nakedness-eye type is classified as grating display, holographic display, integral imagingand volumetric display. The principles, structure, advantages, disadvantages and the art-of-state research development of stereoscopic display technology for head type and nakedness-eye type are introduced respectively. The status ofstereoscopic display technology is analyzed. And the future of the technology is forecasted.

The characteristics and function of spectral imaging technology are introduced. The application in fo.rensic science is illustrated. The concept and principle of document inspection are discussed. Based on this, two maininspection methods are introduced. An example of document inspection is given. The instruments and process are in.troduced. And the result is attained. The future development and the application in document inspection of spectralimaging technology are summarized finally.

It is an ultra low-cost solution for liquid detection with infrared LED (light emitting diode) and infra.red sensitive devices. But the day light and movement of detection equipment can easily lead severe noise whichwill cover the desired signal. To decrease the affection of the noise as described, the method is introduced to samplelight from physical environment and mixed light with infrared LED individually in dozens of milliseconds. The sec.ond order difference of the sampled value is used as the reasoning behind the judgment whether the liquid exists ornot. A batch of data is collected to model the change of liquid, and algorithm is established with partition variables.The results show that the desired signal which trigged by liquid could be detected correctly in adverse environment.As the result, this method can be used in real products such as intravenous infusions.

The algorithm for automatic crack detection and identification in slab track images is designedbased on digital image processing technology and many procedures such as image auto-segmentation, edge extrac.tion, edge removing of slab track structure and false crack identification. The algorithm has been proved accuratelyin extracting and marking the crack region by applying to slab track images from actual acquisition. In the experi.ment of 1000 images, all the six manually detected crack images are also detected automatically by the algorithm, i.e., the accuracy rate is 100%. The computational speed of the algorithm can satisfy the real-time detection require. ments.

The operation principle and drive process of cesium lamp are introduced. The characteristics, compo.sition and operation principle of the drive circuit are described. Then the main circuit in the drive and the operationprinciple of a trigger circuit are analyzed in detail. The experimental results show that the design requirements aremet completely. And the rationality of circuit design is verified further.

Avalanche photodiode (APD) has the characteristic of detecting weak light signals. The detectioncharacteristic of APD is directly depended on the design of relevant processing circuits. The operation principle andcharacteristics of APD electro-optic detectors and external influence factors are analyzed. The composition of opera.tion circuit and the best design of APD are researched. During signal post processing, the signal amplification pro.cessing circuit of APD is designed. And the requirements of low noise, bandwidth matching and weak signal amplifi.cation are met, which has an important significance in the field of weak light signal detection of APD.

In the view of the problem on the measurement of projectile coordinate based on laser screen thatneeds massive optical signals, the design of massive optical signals acquisition and storage system is proposed. FP.GA is used as the chip of acquisition and control and FLASH is used as the chip of storage. The collected photoelec.tric signals are temporarily placed in the FPGA build-in FIFO, and then these signals are processed in the FPGAand stored in the FLASH, and USB interface is used to communicate with computer. The simulation results showthat the system could collect and store 64 digital signals successfully, it has flexible structure, simple operation, ac.curate data and large storage.

System composition and operation principles of the drive circuit of an infrared focal plane array (IR.FPA) detector are introduced. Single field-programmable gate array (FPGA) chip is used to control the detector and pre-process infrared images so as to reduce the design size of the whole system and increase design integrated level.The algorithm implementation of FPGA is introduced in detail. The design method and process of key module aregiven. The feasibility of the method is verified with a detector of 640×512 IRFPA. The images are clear with highcontrast and the image post processing requirements are met.

A numerical control focusing circuit with variable speed is designed and implemented. Based on bi.polar transistors such as PNP and NPN, the circuit is in the operation state of an emitter follower to drive the motor.The control information from upper computer is received by FPGA to control the motor accurately. The rotatingspeed of the motor can be adjusted through adjusting analog voltage generated by DA converter. The rotating speedof the motor is kept consistent by the base control voltage of PNP and NPN generated by an analog subtracter. Simu.lation and experimental results show that the circuit is in stable operation state, has simple structure without a relay,low volume and good stability, which can be used in focusing motors of lens widely.

The total design scheme of an electronic shelter is introduced. Based on the analysis of thermalsources in the shelter, the problem about thermal radiation and their solutions are presented. Based on Icepak soft.ware, a model of thermal environment in the shelter is simulated to analyze whether the heat dissipation require.ments of electronic devices can be met. And thermal comfortable feeling of operators in the shelter is considered,too. The simulation calculation indicates that the system thermal simulation work based on Icepak software has bet.ter theory support and guidance effect on total structure design.

The measurement system for laser tracker’s target-missing quantity based on four-quadrant detectorsis introduced. According to the operation principle of the detector and the facula characteristic of tracking laser, the re.lationship between target-missing quantity and the output current of the four-quadrant detector is nonlinear. Accord.ing to the problem, piecewise linear interpolated algorithm is adopted. The measurement system is calibrated by ahigh-precision displacement platform and measurement experiments are performed. The results show that the systemhas a fast measurement speed and high measurement accuracy. The time of measurement per second is up to 600times or more and the accuracy is 5 m within ±500 m measurement range. The system can be widely applied in the re.lated fields.

According to high uniformity requirements of desk lamp lighting, a free curved surface lens is de.signed to perform the secondary light distribution of light emitting diode (LED) light source. Based on the theory ofnon-imaging optics, at the condition of known incident light intensity distribution and required light distribution effect,partial differential equations related to the shape of free curved surface are established. And corresponding numericalvalue algorithm is adopted to obtain the data of the shape of free curved surface. The models of optical lens are builtthrough simulation software Rhinoceros. And optical simulation is performed in Tracepro. The simulation results areobtained to verify the feasibility of the design method.

Based on the output characteristics of photovoltaic (pv) battery and the analysis of MPPT control the.ory, a model of MPPT control system with pv power generation of Boost circuit is researched. The operation princi.ples of each sub-module in the model are analyzed. And the simulation model of the whole system is built by Simu.link software. Taking photovoltaic array STP0950S-36 as an example, the simulation verifies that the maximum pow.er tracking can be well realized by MPPT control system and the changes of exterior environment can be respondedquickly and the efficiency of photovoltaic power generation can be improved effectively.