Name: Jian Bai
Date of Birth: 1967.01
Education Background: Ph.D.
Academic Degree: Ph.D. in Optical Engineering
Professional Title: Professor
Research Directions: Micro-optics, Optical Imaging, Optical Inspection
Postal Address: Room 139, The third Teaching Building, Yuquan Campus, Zhejiang University, No. 38 of Zheda Road, Hangzhou, Zhejiang
Jian Bai has been engaged in the research of hybrid optical imaging and optical detection technology for a long time, and has undertaken many research projects such as the final assembly innovation application transformation project and the National Natural Science Foundation.
The medium-wave infrared refractive-diffractive hybrid optical system was designed by Jian Bai’s research group, which was firstly available in satellite in China and realizes the temperature adaptability, light miniaturization and high resolution of the infrared system in the space environment. Jian Bai undertook the development of the visible light camera and infrared camera of Zheda pico-satellite No.1 A and pico-satellite No.2. Based on the new principle of planar cylindrical projection, the camera realizes the hemispherical imaging field of view and light and miniaturized. It has become the main optical payload of Zheda pico-satellites, which were successfully launched in September 2010 and September 2015 respectively. The camera successfully captured the Earth photo, and achieved long-term work in orbit.
The research results won the first prize of Zhejiang Science and Technology Progress Award. He has published more than 100 academic papers in domestic and foreign journals, including more than 20 academic papers in internationally important journals, and more than 20 patents granted by the state.
2004 – present: Professor, College of Optical Science and Engineering, Zhejiang University
1998 – 2000: Postdoctoral research, Osaka University
1997 – 2004: Associate Professor, College of Optical Science and Engineering, Zhejiang University
1995 – 1997: Lecturer, College of Optical Science and Engineering, Zhejiang University
1992 – 1995: Doctor of Engineering, College of Optical Science and Engineering, Zhejiang University
1989 – 1992: Master of Engineering, College of Optical Science and Engineering, Zhejiang University
1985 – 1989: Bachelor of Engineering, Zhejiang University
Software technology foundation
Micro-optical technology and micro-system
1、Panoramic annular optical imaging system
The panoramic annular optical system can instantaneously complete the imaging of the surrounding 360° range target. The planar cylindrical projection method can realize the super hemisphere imaging and project the object of the cylindrical field of view around the optical axis to the two-dimensional circular plane. Above, the central area is a blind spot. The panoramic belt system was successfully applied in Zhejiang University's pico-satellite No. 1 launched in 2007 and Zhejiang University's pico-satellite No. 2 launched in 2015 to achieve ground observation, and in pipeline inspection, medical endoscopy, security monitoring, driverless, etc. The field has broad application prospects.
2、Micro-optical electromechanical accelerometer
Combined with micro-optics technology and MEMS, the precision acceleration measurement based on micro-cavity is realized, and a series of key technological breakthroughs including sensitivity enhancement, crosstalk suppression, process optimization and temperature effect analysis compensation are obtained. At present, the sensitivity of the acceleration measurement is 2500V/g, the noise level is 180ng/rt Hz, and some performance indicators have reached domestic advanced and international first-class level.
3、Measurement technology of lens with long focal length
The focal length measurement method based on parallel light and equal period grating is proposed to analyze the key factors affecting the measurement accuracy. Then the long focal length detection method based on divergent light and unequal periodic grating (LFMM) is proposed. A complete measurement system has been developed. The focal length measurement accuracy of the system is better than 0.16%, and the repeatability, stability and reproducibility are better than 0.01%, which indicates that the method achieves the full aperture and height of the focal length of the large-caliber long focal length lens.
4、Refractive-diffractive hybrid optical system
For the first time in China, the medium-wave infrared refractive-diffractive hybrid optical system (composed of traditional refractive elements and new binary diffractive elements) has been realized. It has the characteristics of light weight, small size, superior imaging and passive non-heating. In 2004, this technology was used to realize the seeker optical system that can maintain clear imaging without focusing in a large temperature range. In 2004, it successfully hangs flying, and the target test in 2006 was successful, ranking the domestic leading level. This achievement has important implications for the modernization of national defense.
Research on free-form surface based on phase retrieval and its mid-frequency error detection technology. Based on the principle of computational optical imaging, the inversion wavefront information is directly calculated by the focal spot energy distribution, and the wavefront error detection of the optical component in the wide frequency band is realized, which breaks through the problem of the optical component error detection. A phase retrieval method based on multi-dimensional modulation, a detection technique based on phase retrieval of deep convolutional neural networks and a detection technique based on diffraction information fusion of diffractive optical elements are proposed.
Undergraduate and master students majoring in Optoelectronic Science and Engineering, Electronic Engineering, Mechanical Engineering, Physics, etc. are welcome to study for master's and doctoral degrees;
Undergraduate students are welcome to come to the laboratory to do SRTP, Photoelectric Family, etc.
Northwestern Polytechnical University, Hubei University of Technology, CETC, CSIC, SGCC, HUAWEI, DJI, Philips Lighting, etc.
HUAWEI, Alibaba, Baidu, MI, Meituan, ArcSoft, DiDi, Lucent Technologies, AutoDesk, Marvel, ASML, AAC Technologies, China Mobile, SUPCON, CSIC, Innovation Academy for Microsatellites of CAS, etc.