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| 1 | Effect of ^(60)Co-gamma radiation on the random walk error of interferometric fiber optic gyroscopes显示文摘Two ^(60)Co-gamma radiation experiments were launched to explore the radiation effect on optical components and interferometric fiber optic gyroscope (IFOG). In optical components radiation experiment, the result showed that polarization-maintaining (PM) fiber coil loss was the most affected parameter in all the RWC (random walk coefficient) related parameters, compared with the weak sensitivity of other components parameters. In the IFOG radiation experiment, the RWC performance degradation was found to be almost due to an increase of the PM fiber attenuation. Based on the experiment result, a RWC prediction model in radiation, which is obtained by embedding PM fiber loss expression into the RWC model, was built following a power law of dose and dose rate. An IFOG RWC in space radiation environment was predicted from radiation dose and dose rate by the RWC prediction model. This RWC value calculated from test data is fully accorded to the RWC value predicted from radiation dose. | JIN Jing*, WANG XueQin, SONG NingFang & ZHANG ChunXi School of Instrument Science and Optic-electronics Engineering, Beihang University, Beijing 100191, China | 2010 | Science China(Technological Sciences)2010，53，11： | 4 |
| 2 | Reduced phase error of a fiber optic gyroscope using a polarization maintaining photonic crystal fiber显示文摘 | SONG Ningfang MA Pan JIN Jing | 2012 | Optical Fiber Technology2012，18，4： | 1 |
| 3 | Novel dispersion compen- sation method for cross-coupling measurement in PM-PCF based on OCDP 显示文摘 | JIN Jing WANG Shu SONG Ningfang | 2013 | Optical fiber Technology2013，19，5： | 1 |
| 4 | Auto-nomous detection of angle random walk and quantization noise of fiber optic gyro in attitude determination system of satellite显示文摘 | Yuan Rui Song Ningfang ZhangGuohua | | 0，，01： | 1 |
| 5 | Autonomous estimation of Allan variance coefficients of on board fiber optic gyro 显示文摘 | Song Ningfang Yuan Rui Jin Jing | 2011 | Journal of Instrumentation2011，6，09： | 1 |
| 6 | Analysis and calibration of the mounting errors between inertial measurement unit and turntable in dual-axis rotational inertial navigation system显示文摘 | Song Ningfang Cai Qingzhong Yang Gongliu | 2013 | Measurement Science and Technology2013，10，： | 1 |
| 7 | Reduction of nonreciprocal errors in a differential interferometric fiber optical gyroscope using optically differential processing显示文摘The bias stability of differential interferometric fiber optical gyroscope is analyzed.Thermal error causing long-term bias drift are reduced by putting the 90°splice in the middle of the fiber coil and applying a wide spectrum light source.Also,a kind of novel optical differential processing,which is much more precise than the electronic differential processing,is proposed for reducing the residual nonreciprocal error in the final differential output.An experimental setup based on optical differential processing was built.An^100 fold reduction in the long-term bias drift is demonstrated experimentally compared with the primary differential interferometric fiber optical gyroscope. | ZHANG ChunXi TENG Fei JIN Jing XU XiaoBin SONG NingFang ZHANG ZuChen | 2014 | Science China(Technological Sciences)2014，57，8： | 1 |
| 8 | Experimental investigation of pre-irradiation effect on radiation sensitivity of temperature sensing fiber Bragg grating 显示文摘 | Jin Jing Lin Song Song Ningfang | 2012 | Chinese Physics B2012，21，06： | 1 |
| 9 | Investigations of Temperature Compensation for Fiber Optic Gyros显示文摘 | Duan Jinyuan Song Ningfang Du Xinzheng | 2005 | Journal of Shangxi University2005，28，4： | 1 |
| 10 | Noise decomposition and parameter optimization method for high sensitivity fiber optic gyroscope显示文摘A novel random walk coefficient(RWC) model of the interferometric fiber optic gyroscope(IFOG) to decompose fundamental noise sources, namely the shot noise, the excess noise, the thermal noise, and the detection circuit noise, from the overall noise was developed. The coefficients of the model were extracted from the measured RWC instead of by calculating the accurate IFOG parameters, which is simpler and more accurate. The correctness and the accuracy of the model were verified by experiments. Using this model, the RWC of the experimental IFOG was predicted and the quantitative contributions of the noise sources were determined. According to the predicted results, the parameters of the IFOG were optimized. Finally, based on the model, a noise decomposition and parameter optimization method was proposed for high sensitivity IFOG design. | TENG Fei JIN Jing ZHANG ZuChen DU ShiSen SONG NingFang ZHANG ChunXi | 2015 | Science China(Technological Sciences)2015，58，6： | 1 |
| 11 | Study on the adaptability of augmented reality smartglasses for astigmatism based on holographic waveguide grating显示文摘Background Augmen ted reality(AR)smartglasses are considered as the next generation of smart devices to replace mobile phones,and are widely concerned.But at present,AR smartglasses are usually designed according to the human normal eyes.In order to experience AR smartglasses perfectly,abnormal eye users must first wear diopters.Methods For people with astigmatism to use AR smartglasses without wearing a diopter lens,a cylindrical lens waveguide grating is designed in this study based on the principle of holographic waveguide grating.First,a cylindrical lens waveguide substrate is constructed for external light deflection to satisfy the users'normal viewing of the real world.Further,a variable period grating structure is established based on the cylindrical lens waveguide substrate to normally emit the light from the virtual world in the optical machine to the human eyes.Finally,the structural parameters of grating are optimized to improve the diffraction efficiency.Results The results show that the structure of cylindrical lens waveguide grating allows people with astigmatism to wear AR smartglasses directly.The total light utilization rate reaches 90%with excellent imaging uniformity.The brightness difference is less than 0.92%and the vertical field of view is 10°.Conclusions This research serves as a guide for AR product designs for people with long/short sightedness and promotes the development of such products. | Shenze WANG Kaikai DU Ningfang SONG Dongfeng ZHAO Di FENG Zhengqian TU | 2020 | Virtual Reality & Intelligent Hardware2020，2，1： | 0 |
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