Highly sensitive multi-component long period acceleration measurment

高灵敏度多分量长周期加速度测量

• 批准号: 05554010
• 负责人: KANESHIMA Satoshi
• 金额: $ 7.1万
• 依托单位: University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-05554010/
• 关键词: acceleration measurement; long period; multi component; 1 nanogal; Super conductive gravimeter; art pressure correction; long period ground noise; 環境制御; 比較測定; 長周期加速度計; 高感度; コア・フェイズ

Measurments of long period accerelation are important to detect weak signals generated by deformations in the Earth's core. We performed studies of long period accerelation measurment of 3 components with high sensitivity, by modifying an existing broad band seismoneter STS2, our altimate goal is to develope a 3 component accerelerometer which can detect signals at abount 1000 seconds as small as 1 nanogal. We deployed the modified sensor together with a broadband seismoneter (STS1) in a laboratory within a geodetic measurment tunnel at Esashi, which belongs to National Astronomical Observatory. Mizusawa Observation Center. By 10rgaring outputs from the modified sensor and STS1, and calibrating the modifiod sensor with a remote control techinique, we confirmed that modified sensor has a linearity within a dynamic range as large as 100db, are comporable to the STS1 in a frequency band as high as 5mHZ,bat is inferior to the STS1 in a frequency band longer than 5mHZ.We also performed theoretical considerations on the effects of tenperature and pressure fluctuations on the accerelometer, and summarized methods to surpress such effects to measure long period accerelation as small as 1 nanogal.

测量长周期加速度对于探测地核变形产生的微弱信号很重要。我们对现有的宽带地震仪STS2进行了高灵敏度的三分量长周期加速度测量研究，我们的最终目标是开发出一种可以在1000秒左右检测到小至1纳米信号的三分量加速度计。我们将改进后的传感器与宽带地震仪（STS1）一起部署在国家天文台Esashi大地测量隧道内的实验室中。水泽观察中心。通过对改进后的传感器和STS1的输出进行对比，并采用遥控技术对改进后的传感器进行标定，我们证实了改进后的传感器在动态范围内的线性度可达100db，在高达5mHZ的频段内可与STS1相媲美，但在大于5mHZ的频段内优于STS1。我们还从理论上考虑了温度和压力波动对加速度计的影响，并总结了抑制这种影响的方法，以测量小至1纳米的长周期加速度。

项目成果

Satoshi Kanesnina et al.: "Seismic 3tructure near the inner core-outer core boundary" Geophysical Research Letters. 21. 157-160 (1994)

Satoshi Kanesnina 等人：“内核-外核边界附近的地震 3 结构”地球物理研究快报。

川勝 均,金嶋 聡: "広帯地表計で診る火山活動" 科学. 65. 704-707 (1995)

Hitoshi Kawakatsu、Satoshi Kanajima：“使用宽带表面测量仪评估火山活动”《科学》65. 704-707 (1995)。

S.Kaneshima et al.: "Seismic structure near the inner core outer core bondary" Geophysical Research Letters. 21. 157-160 (1994)

S.Kaneshima 等人：“内核外核边界附近的地震结构”地球物理研究快报。

S.Kaneshima et al: "Seismic structure near the inner core-outer core boundary" Geophysical Research Letters. vol.21. 157-160 (1994)

S.Kaneshima 等人：“内核-外核边界附近的地震结构”地球物理研究快报。

H.Kawakatsu and S.Kaneshima: "Broad band seismometry and volcanoes" Kagaku. vol.65. 704-707 (1995)

H.Kawakatsu 和 S.Kaneshima：“宽带地震测量和火山” Kagaku。