CAJ | 학술논문

大气相干长度是对大气湍流介质进行定量描述的重要参量之一。介绍光强闪烁法和到达角起伏方差法反演大气相干长度两种不同测量方法。在相距893m的水平路径上进行激光大气传输实验，每隔10分钟对数据进行采样，计算出光强闪烁指数和到达角起伏方差。在弱湍流情况下，利用光强闪烁指数和达到角起伏方差反演大气相干长度。实验结果表明两种测量方法存在一定差异，但总体趋势保持一致，但秋季与夏季的趋势不一致，并对两种测量方式产生误差的原因进行了分析。
대기상간장도시대대기단류개질진행정량묘술적중요삼량지일。개소광강섬삭법화도체각기복방차법반연대기상간장도량충불동측량방법。재상거893m적수평로경상진행격광대기전수실험，매격10분종대수거진행채양，계산출광강섬삭지수화도체각기복방차。재약단류정황하，이용광강섬삭지수화체도각기복방차반연대기상간장도。실험결과표명량충측량방법존재일정차이，단총체추세보지일치，단추계여하계적추세불일치，병대량충측량방식산생오차적원인진행료분석。
The atmospheric coherence length is one of most important parameters of atmospheric propagation of laser. The means of atmospheric coherence length measurement inferred by measuring the optical wave’s angle-of-arrival (AOA) fluctuation and the measurement method deduced from the irradiance scintillation of laser propagation are de-scribed. A measurement experiment of atmospheric propagation of laser is conducted along the longitudinal path with 893 meters apart. The experimental sample frequency of data acquisitions is 10 minutes. The fluctuation variance of irra-diance scintillation and AOA are computed based on the data. Under weak turbulence,the atmospheric coherence length is computed using irradiance scintillation fluctuation variance and AOA fluctuation variance respectively. Some differences exist between the two methods,but the overall trend remains the same. The results differ in autumn and summer. Er-ror reason of the differences is analyzed.