The compact super-fluorescent fiber source （SFS） output spectra variations at different pump currents and under different dose of gamma-ray radiation were measured and compared respectively. The radiation-induced at...The compact super-fluorescent fiber source （SFS） output spectra variations at different pump currents and under different dose of gamma-ray radiation were measured and compared respectively. The radiation-induced attenuation （RIA） self-compensating effect in SFS based on photo-bleaching was found and the general mathematic model of SFS output spectra variations was made. The radiation-induced background attenuation （RIBA） at the pump wavelength was identified to be the main cause of the total output power and spectra variations and the variations can then be compensated by active control of the pump power to enhance the self-compensating effect. With closed-loop feedback control of pump current, double-pass backward （DPB） configuration and spectrum re-shaping technology, an SFS prototype was made and tested. The mean-wavelength stability of about 87.4 ppm and output power instability of less than 5% were achieved under up to 200 krad （Si） gamma-ray irradiation.展开更多
Nuclear magnetic resonance gyroscopes （NMRGs） are a kind of rotation-speed sensor that senses the angular velocity by measuring a frequency shift in the Larmor pre- cession of the nuclear spin in a constant magnetic...Nuclear magnetic resonance gyroscopes （NMRGs） are a kind of rotation-speed sensor that senses the angular velocity by measuring a frequency shift in the Larmor pre- cession of the nuclear spin in a constant magnetic field.展开更多
A simple wavelength-independent scale factor model is established for a closed-loop interferometer fiber optic gyroscope（IFOG） and a method to keep the scale factor radiation tolerant and temperature stable in a hig...A simple wavelength-independent scale factor model is established for a closed-loop interferometer fiber optic gyroscope（IFOG） and a method to keep the scale factor radiation tolerant and temperature stable in a high performance IFOG for space application is proposed.The half-wave voltage（Vπ） of the multifunction gyro chip at different wavelengths and temperatures is measured and the radiation-independent inherent parameter of the modulator is picked out and found be proportional to the temperature and slightly wavelength dependent.An experimental IFOG is developed and the scale factor is measured at different temperatures and under ^60Co irradiation,respectively.Less than a 10 ppm scale factor instability is achieved within the-40℃ to ＋60℃temperature range and more than 100 krad（Si） total radiation dose.展开更多
基金supported by the Special Fund for Development of National Major Scientific Instruments of China(Grant No.2013YQ04081504)the Program for Innovative Research Team in University,China(Grant No.IRT 1203)
文摘The compact super-fluorescent fiber source （SFS） output spectra variations at different pump currents and under different dose of gamma-ray radiation were measured and compared respectively. The radiation-induced attenuation （RIA） self-compensating effect in SFS based on photo-bleaching was found and the general mathematic model of SFS output spectra variations was made. The radiation-induced background attenuation （RIBA） at the pump wavelength was identified to be the main cause of the total output power and spectra variations and the variations can then be compensated by active control of the pump power to enhance the self-compensating effect. With closed-loop feedback control of pump current, double-pass backward （DPB） configuration and spectrum re-shaping technology, an SFS prototype was made and tested. The mean-wavelength stability of about 87.4 ppm and output power instability of less than 5% were achieved under up to 200 krad （Si） gamma-ray irradiation.
基金supported by the National Natural Science Foundation of China(Nos.61673041,61673041,and 61227902)the National High Technology Research and Development Program 863(No.2014AA123401)
文摘Nuclear magnetic resonance gyroscopes （NMRGs） are a kind of rotation-speed sensor that senses the angular velocity by measuring a frequency shift in the Larmor pre- cession of the nuclear spin in a constant magnetic field.
基金supported by the Development of National Major Scientific Instruments(No.2013YQ04081504)the Aviation Key Laboratory of Science and technology on Inertia(No.20140851012)+1 种基金the State Key Laboratory of Advanced Optical Communication Systems Networks(No.2016GZKF001)the Program for Innovative Research Team in University(No.IRT1203)
文摘A simple wavelength-independent scale factor model is established for a closed-loop interferometer fiber optic gyroscope（IFOG） and a method to keep the scale factor radiation tolerant and temperature stable in a high performance IFOG for space application is proposed.The half-wave voltage（Vπ） of the multifunction gyro chip at different wavelengths and temperatures is measured and the radiation-independent inherent parameter of the modulator is picked out and found be proportional to the temperature and slightly wavelength dependent.An experimental IFOG is developed and the scale factor is measured at different temperatures and under ^60Co irradiation,respectively.Less than a 10 ppm scale factor instability is achieved within the-40℃ to ＋60℃temperature range and more than 100 krad（Si） total radiation dose.
