 The research of the IOEE covers opto-electronic instruments, precision metrology and measurement, modern optical information processing, the theory and components of binary optics, and the birefringent frequency-splitting lasers.Several famous scientists work in the IOEE, including Professor Guofan Jin, an academician of the Chinese Academy of Engineering, and Professor Kegong zhao, formerly the president of the Chinese National Institute of Metrology.The Institute of Instrument Science and Technology is the most important institute in the State Key Laboratory of Precision Measuring Technology and Instrument Science at Tsinghua University.