The Compensation of Y Waveguide Temperature Drifts in FOG with the Thermal Resistor

2014 ◽  
Vol 924 ◽  
pp. 336-342 ◽  
Author(s):  
Ying Li Wang ◽  
Li Yong Ren ◽  
Jin Tao Xu ◽  
Jian Liang ◽  
Meng Hua Kang ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Fiber Optic ◽  
Driving Voltage ◽  
Fiber Optic Gyroscope ◽  
Temperature Drift ◽  
Thermal Resistor ◽  
Bias Drift ◽  
Half Wave Voltage ◽  
Half Wave ◽  
Environment Temperature

The lithium niobate integrated optical phase modulator (Y waveguide) is the key device in the digital closed-loop fiber optic gyroscope. However, the half-wave voltage of the lithium niobate changes with the environment temperature, which produces the phase bias drift and ultimately decreases the accuracy of FOG. In this manuscript, the thermal resistor is introduced in the amplification part in the driving circuits of Y waveguide. Due to the characteristic of the thermal resistor, the magnitude of driving voltage on Y waveguide changed with temperature to compensate the electro-optic effects temperature drift of the lithium niobate. This method was proved to improve the performance of fiber optic gyroscopes conveniently in experiment.

scholarly journals Ti-indiffused waveguide polarizers on Lithium Niobate for Fiber Optic Gyroscope

2018 ◽  
Author(s):  
Yasemin Kanlı ◽  
Evren Öztekin ◽  
Seval Dönertaş ◽  
Mutlu Gökkavas ◽  
Ekmel Ozbay
Keyword(s):  
Lithium Niobate ◽  
Fiber Optic ◽  
Fiber Optic Gyroscope

1.3mW 1550nm Er-DOPED SUPER FLUORESCENT FIBER SOURCE FOR MISSILE FIBER OPTICS GYROSCOPE

2014 ◽  
Vol 5 (3) ◽  
pp. 993-1000
Author(s):  
P Nageswara Rao ◽  
S K Shrivastava
Keyword(s):  
Fiber Optics ◽  
Light Source ◽  
Fiber Optic ◽  
High Energy ◽  
Fiber Optic Gyroscope ◽  
Physical Size ◽  
Bias Drift ◽  
Large Bandwidth ◽  
Gamma Radiations ◽  
Er Doped

Single - axis missile fiber optic gyroscope requires a light source  with a band width> 10 nm and  output power  > 0.5 mW  .The commercial FOGs    weigh   200-250gms with  a physical size of 100mmX100mmX50mm..The type of light source for missile fiber optic gyroscope is selected by operating wavelength, wavelength stability with temperature, volume and physical size. Incase of space fiber gyroscopes,  the source should be insensitive to high energy radiation like proton and gamma radiations as well. Large bandwidth light source contributes to small bias drift by gyroscope. A small volume and light weight Single Pass Backward Signal Er3+  doped Super-fluorescent Fiber source was developed using only four commercially available components for use in  missile single axis fiber optic gyroscope .The bandwidth and output power of the source are 30. 507nm and1.318mW  respectively. We presented the experimental results along with non-flattened ASE spectrum. The packed super-fluorescent fiber  source   has   a  volume  of 100mm X 100mm X 25mm  and a weight of 150 grams which to our knowledge the  smallest  in volume and light in weight ever reported.

Temperature Drift Modeling and Compensating of Fiber Optic Gyroscope

2012 ◽  
Vol 220-223 ◽  
pp. 1911-1916 ◽  
Author(s):  
Tao Xiao ◽  
Ming Hua Pan ◽  
Guo Li Zhu
Keyword(s):  
Least Squares ◽  
Temperature Change ◽  
Autoregressive Model ◽  
Fiber Optic ◽  
Fiber Optic Gyroscope ◽  
Temperature Drift ◽  
Factors Affecting ◽  
Least Squares Fitting ◽  
Drift Model ◽  
Main Factors

The main factors affecting the temperature drift of the fiber optic gyroscope was analyzed in this paper. The autoregressive model of temperature drift related to the temperature and the rate of temperature change was built. The coefficients of the model can be obtained by least squares fitting. Experiments show that the model was effective. With the drift model the drift trend caused by temperature can be estimated. The temperature drift can be compensated using the drift trend. The experiment result shows that the drift error can be decreased about 87% after compensation.

A Novel Compensation Method for FOG Temperature Drift Based on TUKF

2014 ◽  
Vol 568-570 ◽  
pp. 405-410
Author(s):  
Yang Li ◽  
Bai Qing Hu ◽  
Feng Zha ◽  
Kai Long Li
Keyword(s):  
Fiber Optic ◽  
Unscented Kalman Filter ◽  
Network Models ◽  
Compensation Method ◽  
Mean Square ◽  
Numerical Instability ◽  
Fiber Optic Gyroscope ◽  
Elman Network ◽  
Temperature Drift ◽  
Mean Square Errors

Aiming at the problem of modeling and compensation of the fiber optic gyroscope (FOG) drift caused by temperature, a novel compensation method for FOG temperature drift based on transformed unscented Kalman filter (TUKF) is proposed. Elman network with faster convergence speed is used to modeling and TUKF algorithm is adopted to train the weights of Elman network, which effectively solves the problem of numerical instability. The results prove that the proposed method has higher precision compared with Elman network and IUKF network models. By using the TUKF algorithm, the root mean square errors (RMSE) are improved by 60%  in temperature rise period and 50.5% in fall period.

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