Province Key Laboratory of Modern Optical Technology of Jiangsu

Suzhou, China

Province Key Laboratory of Modern Optical Technology of Jiangsu

Suzhou, China
SEARCH FILTERS
Time filter
Source Type

Hong X.-M.,Soochow University of China | Hong X.-M.,Province Key Laboratory of Modern Optical Technology of Jiangsu | Guo P.-J.,Soochow University of China | Guo P.-J.,Province Key Laboratory of Modern Optical Technology of Jiangsu | And 2 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011

Testing system based on computer-generated holograms(CGHs) can achieve high accuracy of aspherical measurement, this paper studies a new method for testing convex aspheric surface-two CGHs. This method has an advantage in resisting interference and needing no huge assistance surfaces. For a convex hyperboloidal mirror, such a testing system has been designed and optimized in Zemax with the testing accuracy of prior to 0.015λ, and all of other disturbing rays image outside of aperture with a radius of 0.8mm. Finally, the system errors are analyzed in detail and the results show that this system can guarantee the testing accuracy of aspherics. In addition, this testing system can also measure off-axis aspherics and free-form surfaces. © 2011 SPIE.


Wang Z.,Soochow University of China | Wang Z.,Province Key Laboratory of Modern Optical Technology of Jiangsu | Ye L.,Soochow University of China | Dan L.,Soochow University of China
Lecture Notes in Electrical Engineering | Year: 2011

The paper describes the new design and frame of sun sensor using the optical fiber. This scheme can prevent the sun sensor is harming by high energy particles in space or ensure the sun sensor good work in the rain, snow conditions on earth, it is a reason using two twain optical fibers. Sense signals form sunlight is amplified by differential amplifier for obtaining higher SNR. Finally data to measure the location of sun is acquired by MCU. Now this technology has been attempted used to CPV (Concentrating Photovoltaic) for increasing the efficiency of generating electricity by the solar energy. © 2011 Springer-Verlag Berlin Heidelberg.


Li Y.,Soochow University of China | Li Y.,Province Key Laboratory of Modern Optical Technology of Jiangsu | Zhou W.,Soochow University of China | Zhou W.,Province Key Laboratory of Modern Optical Technology of Jiangsu | And 2 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

A kind of sun sensor is designed based on the optical fiber. This project consists of three parts: optical head, photoelectric sensor and signal processing unit. The innovation of this design lies in the improvement of traditional sun sensor, where multi-fibers, used as a leader, are symmetrically distributed on the surface of a spacecraft. To determine the attitude of a spacecraft, the sun sensor should measure the direction of the sun. Because the fiber length can be adjusted according to the fact, photoelectric sensor can be placed deeply inside a spacecraft to protect the photoelectric sensor against the damage by the high-energy particles from outer space. The processing unit calculates the difference value of sun energy imported by each pair of opposite optical fiber so as to obtain the angle and the orientation between the spacecraft and the sun. This sun sensor can suit multi-field of view, both small and large. It improves the accuracy of small field of view and increases the precision of locating a spacecraft. This paper briefly introduces the design of processing unit. This sun sensor is applicable to detect the attitude of a spacecraft. In addition, it can also be used in solar tracking system of PV technology. © 2010 SPIE.


Li D.,Soochow University of China | Zhou W.,Soochow University of China | Zhou W.,Province Key Laboratory of Modern Optical Technology of Jiangsu | Li Y.,Soochow University of China
Guangdian Gongcheng/Opto-Electronic Engineering | Year: 2011

Based on the technology of optical fiber, an analog sun sensor was designed. It consists of three parts: the optical head, optic-electronic sensor and the measurement and calculation of sun angle. The optical design of the sun sensor adopts two pairs of optical fiber and a central optical fiber, and then obtains the relative angular relationship between the sun and the spacecraft's own coordinate system by calculating the difference value of importing light of each pair of optical fiber. The optical structure can suit multi-fields of view, including both small and large. It can increase the accuracy of the positioning system. Optical fiber was used as a leader, which connected the optic-electronic sensor inside the spacecraft. Keeping the sensor deep inside the spacecraft will protect the sensor from being damaged by high-energy particle in space. Circuit and signal processing were briefly described, and compensation of the error was analyzed. Preliminary test has shown that the system accuracy can reach ±0.15 degrees. This sun sensor is particularly applicable to attitude control system of spacecraft and solar tracking system on ground.


Li D.,Soochow University of China | Zhou W.,Soochow University of China | Zhou W.,Province Key Laboratory of Modern Optical Technology of Jiangsu | Li Y.,Soochow University of China
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011

This paper mainly introduces the system of sun-tracking control in CPV (Concentrating Photovoltaic), includes new structure design, process circuit and software design. This system includes five photoelectric sensors, five optical fibers, one microcontroller, two-axis motion mechanism and motors etc. Here a center fiber is used to determine whether the sun appears and get a reference illuminance, and other four fibers are symmetrically distributed around the center fiber. The optical fibers lead sunlight energy into photoelectric sensors and their length can be adjusted according to actual case. So that system is flexible and has good anti-jamming. The difference value of optical energy gained by each pair of opposite optical fiber is important measure data processed by MCU. Through the calculate result by a MCU, the system can gain the direction of the sun in real time. In addition, this paper presents processing circuit, software about control process as well as error analyzes. The software also provides a scheme for suiting any weather. This new structure can protect the photoelectric sensor in any case of the weather and environment, because the sensors are deeply put inside the instrument and the light energy is passed by the fibers. More than that, through calculating the difference value of each opposite pair of fiber, controlling the motors and increasing the accuracy of sun-tracking can be realized. © 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).

Loading Province Key Laboratory of Modern Optical Technology of Jiangsu collaborators
Loading Province Key Laboratory of Modern Optical Technology of Jiangsu collaborators