Fei Guo

A Simple and Rapid Electrochemical Method for Determination of Ascorbic Acid

This paper introduced a simple and rapid electrochemical method for determination of ascorbic acid (AA). A screen-printed carbon electrode modified by multilayer films containing multiwall carbon nanotubes (MWNTs) and redox polymer. The modified electrode exhibited good stability and high electrocatalytic activity towards AA in the presence of uric acid and dopamine even in the real samples. The response current revealed a good linear relationship with the concentration of AA in the range of 5×10-7 M~7×10-5 M and the detection limit was 3×10-7 M.

Application and Analysis of the Full-Wave Band CCD System in Image Interpretation Technology

The full-wave band CCD system is widely used for military,civil or photography of criminal image and extraction analysis,its wavelength is range between 200 nm and 1200 nm,including ultraviolet,visible light and infrared.Through translating blanck visibleimage into optical image,and realizing collecting of weak signal under low illumination case and collecting and processing of high quality image,it makes Full-wavelength CCD system the powerful features such as the topography and landform scaning,traces exploration,file inspection,holographic photography and image processing.The whole band CCD system structure,characteristic and the application of the image interpretation technology were briefly introduced in this paper,and experiment band CCD selected was validated.

Research on Road Target Recognition Method Based on Optical Image

With the development of science and technology, optical images with very high resolution have been able to provide a large amount of information. Therein the road target is the most widely used in optical image. Road target detection and recognition is extremely important for reducing a lot of practical work and greatly improving the efficiency of the target extraction and identification. Aimed at this problem, we propose a road target recognition method based on optical image.The method is realized by joining human recognize and identify, combining with the intelligence of computer processing and powerful place. So in this work, the method based on edge detection and Hough transform algorithm is exploded. The man-machine interactive recognition system (Road Target Extraction and Recognition System) is developed. The system is realized under Windows operating system. The tool is Visual C++ 6.0 software. The platform is MFC functions. The system is written in C++ language. The characteristics of the system are the strong pertinence and the simple operation. When the system is applied safely, the results are definite and clear.

Research of Diameter Measurement Based on CCD Image Sensor

Use the photoelectric device-linear CCD as a measurement tool, and use the SCM for the data acquisition and data processing, a diameter measurement system which is a low costing, high-precision, non direct contact, can be created. The system can provide diameter real-time monitor to pipe production process.

Development of thermal infrared imaging system

Development of thermal infrared imaging system has experienced three generations. The main features of every generation are illustrated briefly. The 3rd thermal imager prototype of the United States is as example. The key techniques are analyzed in detail, which are adopted in the optical system, infrared detector module, control and signal processing circuits，etc. The traits of the 3rd Generation thermal imager are summarized. These provide certain critical thinking to research and development of Chinese 3rd thermal infrared imaging system.

Study on Locating of Focus Surface Position for Aerial Cameras

A system for locating the focus surface position of aerial cameras is designed, and the working principle, hardware composition and software design of the system are described. In the system, a collimator is used for producing locating information, and CCD camera is used as a photoelectric converter for receiving the images. The data is processed by center of gravity method, and the converter controls the translation of the camera in axial direction precisely. The focus surface was determined by size of the collected images. Defocusing or not is judged based on the distance between the actual image location and focal plane. Tests to a couple of aerial cameras show that the defocusing judgment result is the same as the flight test result. Therefore, the system can be used to judge whether the aerial camera is defocusing, and thus to judge whether it can work normally or not.

Filtering of Digital Hologram

With the development of computer technology and high-resolution charge coupled device (CCD), digital holography is widely used. However, there are noises in digital hologram inevitably, which is very unfavorable to reconstruct hologram and analysis fringes. From two aspects: frequency domain and space domain, we adopted mean filter, medium filter and Butterworth low-pass filter to remove the noise in digital hologram obtained with experiment. The experimental result showed that digital hologram was clearer and its contrast was enhanced. There was better reconstructing effect.

Two Methods of Improving the Focus Survey Precision Based on CCD Camera

The principium of measuring focus of aerial camera and the location of the actual image plane with CCD camera are introduced, and the methods to improve survey precision are described. The image is received by area CCD camera. The accuracy of orientation of the imaging central line is improved by means of fit the curve method or by center of gravity method. Therefore, the distance between imaging central lines is refinedly calculated. The experimented turn out that the two methods on measuring focus of aerial camera have high precision, and the survey errors are in accordance with the theoretical ones (0.12%). The two methods on deterministic result of the location of the actual image plane are identical, with their precision reaching 100%.

Apochromatic Collimator Objective Lens Design with Big Field of View

Objective lens is the core part of a collimator, its quality has a direct impact on the collimators quality. Due to the small field of view and low image quality requirement, general collimator objective lens is difficult to achieve the requirement of testing an aerial camera s performance. So designing a large field of view, apochromatic collimator objective lens has an important practical significance. In this paper, the major qualifications were first proposed to design the collimator objective lens,according to which the initial configuration was confirmed. Then we used the ZEMAX optical design software to optimize the initial structure and normalized the optimized structural parameters. Finally the image quality of collimator objective lens was evaluated to make it achieve the requirement of qualifications.

Focal Length Measurement of Lens Based on Linear Array CCD

Focal length of lens is an important parameter to determine the relationship between objective and image. It must be measured accurately. The traditional method of using optical bench to measure the focal length of lens has big man-made errors. So we used linear array CCD camera instead of eyes as the receiver to measure the focal length of lens in this paper. Based on the theory of point spread function, it firstly determined the evaluation function of focal plane. With the threshold method, it determined the location coordinate of sharp signal. Then it proved the feasibility of this scheme through experiment. Finally we compared the experimental data obtained with this method with the experimental data obtained with traditional method, which showed that it was more accurate to measure the focal length of lens with this method.