摘要
分析国家地磁台网中心2009—2014年FHD磁力仪参考背景噪声数据,发现存在随季节变化,即随温度变化的现象,表明FHD仪观测受温度影响。分析认为,在环境噪声不变的情况下,温度变化会引起FHD仪配谐精确程度和品质因数Q值变化,使仪器选频的信噪比发生变化,从而使观测数据噪声随温度变化。要降低温度对观测数据噪声的影响,需要对仪器设计进行改进,在安装和使用时,尽量缩短FDH仪主机到探头信号线长度,且观测室建设尽量考虑保温要求。
The analysis was based on the FHD magnetometer data noise of the geomagnetic networks of China from 2009 to 2014. The result shows that the data noise varies with the seasons, presents a signifi cant seasonal variation characteristic. After carefully analyzing, we can fi nd this seasonal variation of data noise was caused by temperature. The temperature can infl uence the harmonic accuracy and quality factorQ of the FHD magnetometer, and then change the signal-to-noise ratio of the frequency signal, so the data noise was changed. To reduce the effects of temperature on the observation data noise, an improvement was needed in the instrument design. In addition, under the current condition, try to shorten the length wire between host and sensors, keeping the temperature stability as much as possible are the useful methods.
出处
《地震地磁观测与研究》
2015年第2期103-107,共5页
Seismological and Geomagnetic Observation and Research
基金
全国地磁台网运行维护监督与观测质量监控管理(055250)项目资助
关键词
FHD仪观测
背景噪声
温度
信噪比
FHD instrument
background noise
temperature
signal to noise ratio
