A new method based on Dynamic Data Exchange (DDE) technology for computer-aided alignment is put forward in this paper. It is adopted to realize the automatic data transferring between Matlab and Zemax optical software. Based on the analysis of CAA and its procedure, a self-made program is developed to perform all the CAA steps under Matlab environment. Flow process of this program is shown in this paper. A Gregorian system is adopted as an example to verify the feasibility of the program. Comparisons of the image quality between the misaligned system and the post-aligned system are presented. Results show that this program is very effective.
An important factor influencing the image quality of space or military optical systems is that the broad environmental temperature ranges. It would bring some problems on design, fabrication and mounting of the optical system. The ways of getting rid of the problems and improving the image quality of optical systems by using aspherical metal mirrors to the infrared thermal imaging system are presented in this paper. The choice of mirrors materials, the design of mirrors structure, the analysis of factors of influencing mirrors surface figure are discussed. The actual optical system designed in this paper is a Cassegrain objective, and the reflective surfaces of the primary mirror and secondary mirror are conicoid surfaces. The diameter of the primary mirror is φ240mm, the materials of mirrors is aluminum alloys, and the mounting structure is flexible. The aspherical surface of the metal mirror are fabricated by precision diamond turning machine, and the error of the surface figure is less than 0.5μm. The results of the battlefield test show that the infrared system with metal mirrors discussed in this paper has met the optical design specifications.
Most optical systems are generally used in normal conditions, that means, in normal temperature and pressure. but some optical systems,f or example, those specially used in remote satellite or in aerospace, may be affected by the thermal effects caused by the environmental temperature variation. Some deviations will take place in the refractive indices, curvatures, element thicknesses and airspaces of these systems due to the great variation and difference in temperature, pressure and radiation, and certainly the image quality of the systems will be also not as good as that before. Therefore, when we design these systems, the most important thing is to eliminate the thermal effects caused by the environmental temperature. Most of the previous research involved description of the uniform temperature fields, and some researchers studied the theory of radial distribution of temperature gradients in optical glass lenses. Only in recent years the athermalisation techniquies are proposed and some special examples are reported. Several famous optical design corporations have adopted the techniques and used in their optical design software, for example CODE V of O.R.A. and OSLO Six of Sinclair, however these achievements are only initiatory.
With the advantages of high resolution, large field of view and compacted size, optoelectronic imaging sensors are widely used in many fields, such as robot's navigation, industrial measurement and remote sensing. Many researchers pay more attention to improve the comprehensive performances of imaging sensors, including large field of view (FOV), high resolution, compact size and high imaging efficiency, etc. One challenge is the tradeoff between high resolution and large field of view simultaneously considering compacted size. In this paper, we propose an optoelectronic imaging system combining the lenses of short focal length and long focal length based on dual CMOS to simulate the characters of human eyes which observe object within large FOV in high resolution. We design and optimize the two lens, the lens of short focal length is used to search object in a wide field and the long one is responsible for high resolution imaging of the target area. Based on a micro-CMOS imaging sensor with low voltage differential transmission technology-MIPI (Mobile Industry Processor Interface), we design the corresponding circuits to realize collecting optical information with high speed. The advantage of the interface is to help decreasing power consumption, improving transmission efficiency and achieving compacted size of imaging sensor. Meanwhile, we carried out simulations and experiments to testify the optoelectronic imaging system. The results show that the proposed method is helpful to improve the comprehensive performances of optoelectronic imaging sensors.
A control system based on data acquisition cards is developed for optical flight simulator.The method of the system's developing,the control mode of the LED drivers and the method of DLL(Dynamic Link Library) called in LabVIEW are discussed.This system can achieve data acquisition,real-time display and storage.It can also realize the control of optical flight simulator.
As the large-scale popularization of virtual experiment teaching, many universities and enterprises have built a batch of virtual experiment resources, which obtained preliminary application. To visualize the abstract concept of data relation and unobservable process of data storage, transmission and processing in the course of database technology and application, we designed and implemented a series of virtual experiment, including evolution of data storage, relational database design and SQL statement operation. The application results show that the virtual experiments are beneficial for both learning and teaching. Moreover, combined with online virtual experiment teaching platform, we complete the sharing and promotion of virtual experiment resources.
Compared with traditional optical and radiation detection, polarization detection technology contains unique characteristic information which is different from light intensity, spectrum and phase, and has great advantages in imaging under low contrast conditions. Using polarization technology has higher efficiency and accuracy than simply using light intensity to identify targets. This research is based on the polarized light medium Muller matrix and its polar decomposition to explore the properties of the medium from the image and numerical aspects of non-contact. The images and values of different medium are compared, and the important physical data of related media are obtained on the basis of polar decomposition.
To improve vehicle performance and energy utilization, a novel planetary gear set based flywheel hybrid electric powertrain (PGS-FHEP) is proposed. The PGS-FHEP involves an internal combustion engine, a planetary gear set that integrated a control motor and an energy storage flywheel, which combines the high efficiency of the mechanical flywheel energy storage system with the flexible and controllable characteristics of the electric motor. The powertrain is analyzed and modeled using lever analogy method, and a rule-based control strategy is designed and verified under different test cycles. The simulation results indicate that compared with the traditional manual transmission vehicle, the fuel economy of the vehicle equipped with PGS-FHEP can be improved by more than 50%, and the acceleration performance can be increased by 28.01%. Up to 60.61% of vehicle kinetic energy can be recovered by PGS-FHEP, among which 37.85% can be directly captured by the energy storage flywheel. In addition, the battery charging power is reduced, which is beneficial to prolong the battery life.
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