Abstract

Variations in ambient temperature and atmospheric pressure coincide with the wave train of the lunar–solar tide in the diurnal and semidiurnal frequency ranges, where they have the greatest influence on deformation measurements by laser interferometers. Based on data from the Baksan laser interferometer of the Sternberg Astronomical Institute of Moscow University over a 15-year observation period, it is shown that the response of large measuring systems to these variations has a pronounced frequency dependence. Using the constructed mathematical model the problem of taking into account how meteorological factors influence measurements is solved in the frequency domain with the aid of images of deformation time series and meteorological factors, obtained by Fourier transform. A transient function is constructed in the form of the so-called aperiodic link, which takes into account the frequency dependence and delay of thermoelastic deformation of the measuring system on the variation in ambient temperature. The converted temperature and pressure images are subtracted from the deformation image using the corresponding transient functions. As a result, the new deformation image bears virtually no influence of meteorological factors; inverse transform yields a new deformation time series.

中文翻译：

---

考虑气象因素对大型精密系统影响的问题：以巴克桑大型激光干涉仪为例

摘要

环境温度和大气压力的变化与昼夜和半昼夜频率范围内月-日潮的波列一致，它们对激光干涉仪的形变测量影响最大。根据莫斯科大学斯特恩伯格天文研究所Baksan激光干涉仪在15年观察期内的数据，表明大型测量系统对这些变化的响应具有明显的频率依赖性。使用所构建的数学模型，借助于傅立叶变换获得的变形时间序列和气象因子图像，可以解决在频域中考虑气象因素如何影响测量的问题。以所谓的非周期性链接的形式构造瞬态函数，该瞬态函数考虑了频率依赖性以及测量系统的热弹性变形随环境温度变化的延迟。使用相应的瞬态函数从变形图像中减去转换后的温度和压力图像。结果，新的变形图像几乎不受气象因素的影响。逆变换产生新的变形时间序列。新的变形图像几乎不受气象因素的影响；逆变换产生新的变形时间序列。新的变形图像几乎不受气象因素的影响；逆变换产生新的变形时间序列。