In order to make the spatial light modulator generate the reconstructed image with large depth of field in real time, the GS algorithm is used to calculate the hologram under different parameters in this paper.The reconstructed images under different Fourier holograms are obtained through the simulation of computational holographic reconstruction algorithm. In the case of no Fourier transform lens, the Fourier holograms under different parameters are output to the spatial light modulator by using a computer, and through analyzing 2D real-time dynamic display reproduction image, the conclusion shows that when the number of sampling points of the Fourier hologram is 1 024×768 and the sampling interval is 18 μm, the depth of field of the reconstructed image is 275 cm, and the depth of field of the reconstructed image is the largest under this parameter. The experimental results of Fourier hologram reconstruction with different parameters show that the smaller the phase image element size is, the larger the reconstructed image depth of field is, and the reconstructed image depth of field with Fourier transform lens is smaller than that without Fourier transform lens of the same parameter.

Narrow linewidth lasers have extremely high spectral density, low relative intensity noise, phase noise, and ultra-long coherent length, so they are used as core light sources in many important applications. In this paper, firstly, the basic theory and design ideas of narrow linewidth lasers for reducing linewidth are introduced. Then, the basic structures, key technologies, performance characteristics, and international development status of the four most representative types of narrow-linewidth external cavity diode lasers are introduced. Finally, the application and promotion potential of several types of external cavity lasers are summarized, and the development prospects of narrow linewidth lasers are prospected.

In measuring highly reflective object, fringe projection profilometry (FPP) may cause overexposure of the surface, resulting in missing phase data in the corresponding area. A three-dimensional (3D) measurement method is proposed for the highly reflective object. Only a fixed grating is projected onto the highly reflective object. Two deformed patterns in which highly reflective areas do not overlap each other are captured at different positions with the object’s straight-line movement in the projected region. Subsequently, the 3D shape of the object at these two positions from the two deformed patterns is partially reconstructed separately using single-shot computer-generated Moiré profilometry (CGMP) proposed in our laboratory. Finally, the pixel matching, point cloud registration and fusion are used to obtain the object’s complete 3D shape. With no additional equipment and using only one grating, this method achieves higher accuracy than conventional monocular adaptive fringe projection algorithms and improves the measurement practicality. Experimental results show the feasibility and effectiveness of the proposed method.

According to the characteristics of signal modulation and transmission, a heterodyne interference system composed of two acousto-optic modulators is designed and built. The two-way light intensity modulation avoids the effects of diffraction level mixing and frequency shift caused by acousto-optical modulation. The beat frequency signal formed by the interference of diffracted light from two +1 stages is finally output by using dual modulation. The inter-stage interference is eliminated. At the same time, the system has good collinearity and symmetry, which greatly reduces the influence of the external environment on the measurement and improves the detection precision. In this paper, the phase change information caused by the change of refractive index is detected and processed. The phase characteristics of the system are studied by measuring solutions with different percentage concentrations, and a new solution concentration detection scheme is proposed. The influence of laser drift and modulation intensity on the measurement system is analyzed as sell. The experimental results show that the detection system can effectively detect the concentration of the solution by processing the signal phase difference change information. In the range of 0.1%~0.5%, the maximum relative error is about 8.0%. It provides a reference for the design and fabrication of a miniaturized optical external diffrential interference solution concentration measurment system.

A computer-generated Moire profilometry (CGMP) for maximizing the performance of digital light projector is proposed. For meeting with the dynamic measurement from the source, by using the maximum refresh frame rate and the highest frequency fringe design of digital light projector(DLP), and the binary coded fringe replaces the traditional 8-bit numerical sinusoidal fringe, so that the projector refresh rate can be increased from the traditional 60 Hz to over thousands of Hz. By coding the minimum period binary fringe that satisfies the sampling theorem and using the optimal projection frame rate performance of DLP, they can achieve the minimum equivalent wavelength of the projection fringes on the DLP and superior purification of calculated Moire fringe, and effectively improve the measurement accuracy of CGMP from the source. Compared with Fourier Transform Profilometry (FTP) and High Precision Computer-generated Moire Profilometry (HCGMP), the feasibility and validity of the proposed method are verified. The experimental results show that the proposed method has high measuring accuracy. The measurement of on-line moving “heart-shaped” object shows that the proposed method can satisfied of on-line and dynamic 3D measurement.

Levitated nano mechanical resonator is a newly developed detection method of high-precision measurement. Thanks to the high Q factor, it is promising in a wide range of fields including weak force detection, wave function collapse measurement, and so on. The mechanism of feedback cooling is discussed in this paper. In addition, NdFeB permanent magnets are used to perform diamagnetic levitation of polyethylene glycol 600. In an experiment in this paper, a micro coil is used for feedback cooling for two modes to reach hundreds of Kelvin under 300 K and 10-5 mbar vacuum condition. The experiment result agrees with the theoretical lowest effective temperature, which paves way for a further research on macro quantum phenomena.

The bionic compound eye system solves the contradiction between the field of view and resolution in the traditional single-aperture optical system, and has both large field of view and high resolution. However, with the increase of field of view and resolution, the image information increases, which brings the problem of efficiency and quality in image Mosaic. To solve this problem, a bionic compound eye multi-channel image Mosaic fusion method based on improved scale-invariant feature transformation (SIFT) algorithm and principal component analysis (PCA) algorithm is proposed. The method reduces the feature point extraction area, reduces the number of multiplexed image feature point matching, and decreases the dimensionality of image feature point descriptors. The improved adaptive iterative random sampling consistent (RANSAC) algorithm is used to purify the feature points to increase the robustness, and finally the high-quality fusion of multiple sub-images by the weighted average algorithm is completed. The experimental results show that the proposed algorithm is reasonable in design, and with the increase of the complexity of image information, the Mosaic efficiency is improved compared with the traditional algorithm, and at the same time, the Mosaic quality is better. It can effectively Mosaic and integrate the multi-channel images of the bionic compound eye system, and provides a reference for the mosaic and fusion of the multi-channel image system.

The dust scattering data measured by photovoltaic panels are affected by various noise and interference factors, resulting in large errors in the measured data. For the sake of accurate detection results, a signal denoising method is proposed, combining Kalman filtering and digital phase-locked amplification technology to denoise the dust scattering signal of photovoltaic panels mixed with noise. The denoising performance of the joint algorithm is verified by simulation experiments and denoises the measured dust scattering signal of photovoltaic panels, and calculates the signal-to-noise ratio, root-mean-square error and smoothness. The results show that the signal-to-noise ratio of Kalman filter combined with digital lock-in amplifier denoising algorithm is 36% higher than that of single digital lock-in amplifier denoising algorithm, which can effectively reduce the noise interference in photoelectric detection system and improve the accuracy and stability of photoelectric detection system.

Underwater vehicle optoelectronic device is an important observation and measurement equipment of underwater vehicle, which is affected by the hydrodynamic force of wave and flow field. Under the action of wave and flow field, the optoelectronic device will have periodic bending and vibration.In serious cases, the device may be affected or even damaged. The flow force of optoelectronic device in wave flow field is analyzed and its time domain spectrum is obtained. Then, the maximum deformation and stress response of the underwater vehicle optoelectronic device under the action of wave and flow field are calculated by means of transient dynamic finite element analysis, and the maximum deformation and stress time-domain spectra are obtained. The simulation results show that the dynamic response of vortex lateral force under transient loading is much larger than that under maximum static loading. The mechanical response analysis under the action of wave and flow field is of great significance to the structural strength and application evaluation of device.

An abdominal motion measurement system, which is based on point structured light, is designed to monitor the real-time movement of the patients’ abdomen along with respiratory motion. It can actively compensate the target displacement caused by respiratory and realize the relative stillness of the target in radiotherapy. The laser-point-structured measurement method, which is based on laser triangulation, can convert the abdominal movement into the translation of the laser point. Then, the abdominal movement can be calculated from the extracted pixel locations of the laser point in each captured image with the known system parameters. The experimental results show that the proposed method can obtain the position information accurately in real-time, and it has the advantages of simple structure and high precision and offers a new solution to compensate the respiratory influence in chest and abdomen radiotherapy.

In view of the problems that the existing sub-wavelength anti-reflection grating structure parameters have high requirements on processing technology and are difficult to manufacture, a square cylindrical two-dimensional anti-reflection grating structure is designed. Based on the equivalent medium theory and thin-film anti-reflection theory, the structural parameters of the subwavelength anti-reflection grating are simulated and analyzed. The results show that the average transmittance of the far-infrared band at 20~24 μm can reach 98%, and the transmittance at the central band of 21.8 μm reaches 98%. 99%. The femtosecond laser direct writing method was used for experimental preparation, and the measured average transmittance reached 77%, and the central band transmittance reached 77%, which was similar to the simulation result. It is verified by experiments that the process tolerance of the subwavelength grating structure designed in this paper is better than that of the existing grating structure, and the requirements for experimental processing accuracy are lower, which provides a new way of thinking for the design and processing of other similar grating structures.

The whispering gallery mode(WGM) crystal cavity with a high quality factor and small mode volume has an important application prospect in the fields of optical filters, nonlinear converters, optical sensors and so on. However, the resonant characteristics of exposed optical microcavities are easily influenced by the external environment. In this paper, the coupling and packaging technology of the tapered fiber and the WGM micro-cavity based on the magnesium fluoride crystal is studied. The tapered fiber is prepared by oxyhydrogen flame, and the diameter of the taper waist is about 2 μm. An experimental platform for testing the coupling quality between micro-cavity and tapered fiber is set up. Only a few modes in a specific wavelength range are observed in the optimized the fiber coupling system, and the quality factor reaches 5.15×107. Furthermore, a coupling and packaging system with accurate temperature control is built to improve the stability of the coupling system. A useful idea is provided and realized for packaging ultra-high quality WGM crystal cavities from the perspective of practical application.

Laser gyro is an ideal component of inertial navigation system, which has been successfully applied in land, sea, air and other fields. However, laser gyro is very sensitive to the temperature. When the external temperature changes, the two optical paths of laser gyro are asymmetric, which affects the accuracy of the output angular velocity. In this paper, the temperature field model of laser gyro is established by using the temperature simulation software Icepak, and the temperature distribution of two anode sides of laser gyro cavity is studied under the condition of non-uniform thermal boundary.The simulation results show that when the convective heat transfer coefficient increases by 3 times, the temperature difference between two anodes decreases by 50%. At the same time, the thermal resistance between the shell and the dither mechanism has a great influence on heat conduction, causing a temperature difference of 21%. Moreover, the anisotropic heat transfer material with a ratio coefficient of 1 000∶1 is attached on the surface of the cavity, and the uneven temperature zone will rapidly spread to other areas.The temperature uniformity measured by the two anodes is good. It provides some guidance for the design and engineering of temperature uniformity inside gyro.

Capsule endoscope, widely used in the observation of the internal space of the human body, has the advantages of small volume, long battery life, no pain and so on. However, the traditional capsule endoscope has the disadvantages of small observation range, low relative illumination and low image quality. The capsule endoscope lens with large imaging range, high relative illumination and high resolution is designed in this paper. The design result of the lens show that the FOV is 150°, the F number is 2.8, the total length is less than 6 mm and the average relative brightness in the field of view is over 90%. In order to achieve the high image quality of the lens, the modulation transfer function (MTF) exceeds 30% at 200 lp/mm. The capsule endoscope, which has a compact structure, uses only five spherical lens and and is helpful for medical staff to accurately judge the condition.

In order to analyze and study the infrared radiation characteristics and radiation brightness distribution of transport aircraft, the infrared radiation luminance of airbus A320 aircraft in head-on flight state is measured by using medium wave of 3.7~4.8 μm and long wave infrared thermal imager of 7.7~10.3 μm. The infrared radiation is described by relative contrast. The results show that the main source of aircraft infrared radiation is skin radiation caused by aerodynamic heating. The brightness contrast of medium wave and long wave is 0.61 and 0.37 respectively, which is higher than that of skin of other parts of the fuselage. The brightness contrast of medium-wave and long-wave radiation of wing and tail is 0.04~0.05 and 0.02~0.10, respectively, which is the lowest part of the skin radiation of the aircraft. The brightness contrast of medium-wave radiation in the belly and nose of the aircraft is higher than that of long-wave radiation, with the contrast between 0.30~0.33 and 0.16~0.18, respectively. The research conclusion has certain reference value for target characteristic research, infrared reconnaissance and detection, infrared reconnaissance equipment development and detection.

In order to solve the challenges of low precision, over-reliance on expert experience in temperature controlling system of infrared target simulation device, a fuzzy PID method is designed based on improved GA algorithm optimization in temperature controlling system of infrared target simulation device. The system adopts the improved GA algorithm with auto-adaptive crossover probaility and mutation probability. It optimizes the quantization factor and scale factor of fuzzy PID controller, and completes the adaptive adjustment of PID parameters and determines the optimal solution of the temperature controlling unit. The simulation model of temperature controlling system is established in Simulink and verified by simulation. Compared to the fuzzy PID controller, the improved GA algorithms optimizes fuzzy PID controller shortened the adjustment time by 34.84%, the overshoot by 63.75% and the steady-state error by 66.67%. It shows that the improved GA algorithms optimized fuzzy PID controller can improve the control performance of the system.

Aiming at the rapid leveling requirement after the system damage of vehicle-borne radar servo, a portable accurate leveling system of vehicle-borne radar is designed. The four-station hydraulic system is used as the bearing structure, the electromagnetic reversing valve is controlled using the PLC-based fuzzy PID algorithm and the self-sealing quick live connection hydraulic cylinder is used to realize the rapid lifting of the on-board platform leveling system. Meanwhile, the double-precision inclination sensor is used to feedback the platform precision of X-Y axis, and the fine-tuning precision of the hydraulic cylinder is controlled through the electric in/out control valve beside the cylinder block, so as to realize the accurate leveling of the vehicle-mounted radar. In addition, the pressure sensor is used to judge the “virtual legs” to improve the response speed and stability of the four-points support system. The test results prove that the system has the advantages of strong anti-interference ability, fast lifting and leveling speed, high stability and high precision, which meets the requirements of rapid deployment in wartime.

In the case of renewable energy generation such as photovoltaic power generation, the problem of supply-demand balance capacity should be evaluated and solved in the future power system. Improving existing balancing measures and new technologies such as power supply and demand synergy and energy storage will solve this problem. In this case, the remote power system supply and demand analysis should have the ability to evaluate the equilibrium countermeasures. Compared with time series analysis, this method has some limitations. But there is a big advantage in the maintenance of various electrical equipment can be supply and demand assessment. This paper uses machine learning and deep learning models to provide a new solution for predicting consumer demand and distributed renewable energy. The proposed power system supply and demand analysis model ESPRIT provides a new solution for power supply and demand balance.

There are many sources of error in airborne photoelectric pod, one of which is friction torque. When the optical axis is at low speed or rotating back and forth, its friction torque will change back and forth between static friction and sliding friction, which is difficult to predict. Using identification method to establish friction model and compensate it is a method to improve the accuracy of two-axis and two-frame optical axis. This paper explains the modeling process of friction torque in detail and compares the fitting effects of three models. Coulomb+viscosity model lacks the description of static friction. In the static friction+coulomb+viscosity model, the static friction to dynamic friction is a jump, so it is difficult to estimate and compensate the friction. The LuGre model not only has the relevant description of static friction, but also has a good fitting property because its curve changes slowly, which is more close to the characteristics of the contact surface changing back and forth between static friction and dynamic friction at low speed.

As the core course of optoelectronic undergraduates, Quantum Mechanics plays an extremely important role in the subsequent study and mastery of professional knowledge. According to the teaching summary, the pre-courses have very significant impacts on students for learning Quantum Mechanics. It is necessary to carry out further quantitative analysis and evaluation of the impacts. In this paper, based on factor analysis method and the scores of previous courses and Quantum Mechanics, five course groups composed of previous courses are formed. According to the grey absolute correlation degree, we analyze the significant factors of influence on Quantum Mechanics by which pre-course. Finally, based on the multiple linear regression method, we analyze the correlation between the pre-course and Quantum Mechanics, and summarizes the optimization suggestions for the pre-course setting and teaching based on the analysis results.