| 1. | We used time - domain averaging method and intelligent center searching method to clear up the noises
在软件中分别利用时域平均法和智能中心搜索法来消除白噪声和波长漂移。 |
| 2. | The calculating formulas of central wavelength drift based on thin film microstructure and thermal - stress deformation are deduced , the drift of dwdm filter 15 calculated with these formulas
论文还讨论了波分复用滤光片的温度稳定性问题。推导了薄膜微观结构和热应力形变模型上的中心波长漂移计算公式。 |
| 3. | The experiment proved the adjustments is effective . according to the fact that the structure of the film causes the wavelength shift , we prepared the shift - free polarizers at 1054nrn with plasma - iad
根据膜层的柱状多晶结构是引起工作波长漂移的主要因素，利用等离子体辅助沉积制备出了中心波长为1054nm的无漂移偏振膜。 |
| 4. | After ameliorate the hardware of the spectrometer , there are many kinds of noise added to the system inevitably . they are hot - noise and disperse - noise in electron circuitry and the wavelength excursion due to the grating turning
光谱仪经过硬件改造以后，不可避免地将电子方面的噪声带入到系统中，其中主要包括电子线路中的热噪声和散粒噪声（白噪声）以及光栅转动过程中的机械误差引起的波长漂移。 |
| 5. | 2 . based on interoferometric technique , a parasitic interference configuration was introduced to transpose the wavelength - shift signal into phase - shift signal ; the strains were demodulated by measuring the phase change of the signal with a phase - meter
利用干涉技术，采用寄生干涉结构对传感光栅的反射谱进行波长解码，用相位计观测波长漂移引起干涉仪两臂间相位差的变化，进而监测作用在传感光栅上的待测应变量。 |
| 6. | At last , the experiment result proved the effectiveness of the spectrum rebuilding technology . the experiment result show that the wavelength detection accuracy is improved by an order of magnitude using the spectrum rebuilding technology compared with that obtained from direct peak search . some other schemes to enhance the accuracy are illustrated
最后列举了其它几种提高测量精度的方案,包括关键器件可调谐滤波器的位置变化提高信噪比,调整探测器pinfet的输出电压的零点以提高a / d采集卡的利用率,以及采用系统参考消除系统误差造成的波长漂移。 |
| 7. | This paper analyzes the optical characteristics of fiber grating according to the theory of mode - coupling in nonsymmetrical optical wave - guide , which affords the gist for the testing of optical characteristics and tuning characteristics of fiber grating . moreover , we deduce the linear relationship between reflected wavelength shift of fiber grating and vertical displacement of cantilever beam which the fiber grating is sticked on
论文根据非均匀光波导中的模式耦合理论，分析讨论了光纤光栅的光学特征，为光纤光栅的光学特性和调谐特性的测试提供理论依据；并根据材料力学原理推导了光纤光栅波长漂移量与侧向位移的线性调谐关系。 |
| 8. | A comparison of the optical and mechanical performance is made between with iad and without iad . the optical performances include the refractive index the extinction coefficient the packing density the vaccum - to - air shift and the afm images of the surface ; the mechanical performances include the adhesion and the hardness
光学特性涉及折射率、消光系数、波长漂移、聚集密度和表面粗糙度，机械特性涉及硬度和附着力。通过研究，发现离子辅助沉积对单层薄膜的光学特性和机械特性均有明显改善。 |
| 9. | 4 . a 8 - cascaded wavelength - division - multiplexed fiber bragg grating sensor system was interrogated by changing voltage acting on a employed tunable fabry - perot filter , and a feedback loop was introduced to make filter track the shifted wavelength of the sensor . at the same time an unbalanced scanning michelson interferometer was introduced to demodulate sensor signal
同时为克服查询某一光栅时，应变引起波长漂移导致反射波长偏离f - p透过波长，利用一反馈控制装置，使得滤波器的透过波长自动追踪查询光栅的布一拉格波长，利用非平衡扫描michelson干涉仪对传感信号进行了高分辨率的解调。 |
