基于振动测量的视宁度测量方法研究  

Research of Seeing Measurement Based on Vibration Tests

作　　者：宋佳阳[1,2] 刘忠[1] 金振宇[1] 程向明[1] 

机构地区：[1]中国科学院国家天文台/云南天文台,云南昆明650011 [2]中国科学院研究生院,北京100049

出　　处：《天文研究与技术》2012年第4期405-410,共6页Astronomical Research & Technology

基　　金：国家自然科学基金(11078004)资助

摘　　要：根据像运动法测视宁度的原理,研究了一种新的视宁度测量方法,可以用口径为10 cm左右的望远镜测视宁度,并能排除人为因素和仪器光学质量的影响。原理是用加速度传感器测量望远镜的振动,并从单个星像的抖动中扣除镜筒振动的影响。为此设计了一套测量振动装置,进行了观测,并与差分像运动视宁度监测仪(Differential Image Motion Monitor,DIMM)作了比较,发现该方法在一定程度上消除了望远镜抖动对像运动法测视宁度的影响,但不能完全消除。According to the theory of seeing measurement based on image motion, we proposed a new method of seeing-parameter measurement in which seeing can be measured by a telescope a 10cm aperture with human influences and the telescope optical quality variational effects. The methodology used in this paper is to measure the vibration of telescope with an acceleration sensor, then to calculate the painting telescope vibrations using the integration and filtering of acceleration signals, and finally to subtract the estimated vibrations from a single-star image motion. This is to eliminate the impact of telescope vibration. So we design a set of vibration measurement equipments, and compare observation results with these to those obtained with DIMM. We need to apply high-frequency bandpass filtering because the integration of signals can generate low frequency components. The choice of cut-off frequency can affect the result seeing parameter greatly. Therefore, this method can reduce the impact of telescope movement for the seeing measurement to certain extent. However because of residual movement effects and accumulation of integration error, there is a large difference between the final observation results with DIMM and this method.

关 键 词：视宁度 像运动 振动测量 

分 类 号：P112[天文地球—天文学]