CAJ | 학술논문

为了去除布里渊雷达系统中Fabry-Perot标准具的谱线展宽对谱特征参数测量精度的影响，本文提出了一种双参数拟合结合单参数拟合的方法。该方法首先根据F-P标准具的谱线展宽原理，采用双参数L-M算法进行拟合，分析了拟合参数中拟合向量初始值和最大迭代次数对拟合精度的影响；然后针对其中一个拟合参数结果不稳定的问题，选择附加一个单参数拟合来提高测量精度。实验结果表明，该方法可以使谱特征参数测量精度稳定在MHz量级，保证了0.1℃的温度测量精度。
위료거제포리연뢰체계통중Fabry-Perot표준구적보선전관대보특정삼수측량정도적영향，본문제출료일충쌍삼수의합결합단삼수의합적방법。해방법수선근거F-P표준구적보선전관원리，채용쌍삼수L-M산법진행의합，분석료의합삼수중의합향량초시치화최대질대차수대의합정도적영향；연후침대기중일개의합삼수결과불은정적문제，선택부가일개단삼수의합래제고측량정도。실험결과표명，해방법가이사보특정삼수측량정도은정재MHz량급，보증료0.1℃적온도측량정도。
In Brillouin lidar system based on the Rayleigh-Brillouin scattering (RBS) and Fabry-Perot (F-P) etalon, the spectral broadening of F-P etalon could produce measurement error of spectrum characteristics. A fitting procedure based on the combination of the dual-parameter fitting and single-parameter fitting for removing the broadening effect is proposed in this paper. Firstly, based on the analysis of the broadening effect of F-P etalon on the spectrum, a dual-parameter Levenberg-Marquardt (L-M) algorithm fitting is proposed and the effects of the initial values of the fitted parameters and the iteration steps in the fitting are analyzed. Then to deal with one parameter’s floating, an extra single-parameter fitting procedure is proposed to improve the measurement accuracy. Experiments show that the fitted results can be stable in the magnitude of MHz and the measurement accuracy of temperature can be improved to 0.1 ℃.