Study on refinements of the highly sensitive/wide band servo-type seismometer using the astatic rotational pendulum

非静转摆高灵敏宽带伺服地震仪的改进研究

• 批准号: 15340144
• 负责人: OTAKE Yuji
• 金额: $ 10.62万
• 依托单位: RIKEN (2004)The University of Tokyo (2003)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15340144/
• 关键词: seismometer; magnetic levitation; permanent magnet; highly sensitive; wide band; vertical pendulum; nanometer technology; displacement detection; 高感度変位検出; 長周期; 磁気バネ

The aim of this study is development of a highly-sensitive/wide-band seismometer utilized for a new stage on global seismology. The seismometer should measure acceleration under 10^<-9> m/s in a frequency from 0.003Hz to 100Hz. We show the results of our study below.1.The DC power supply, having stability of less than 10^<-6> and noise of -130 dBV in a frequency over 1Hz, was developed.2.Three practical seismometers using the rotational pendulum were built. The seismometer equips a float counter to a pendulum weight to correct the effect of an atmosphere pressure change at the weight, and a chamber to isolate an atmospheric pressure change.3.The seismometer with the low noise DC power supply and without the chamber was able to measure as much as a noise level of 10^<-10>(m/s)/Sqrt(Hz) that is almost overcoming that of STS-II.4.To consider observations in an under ground tunnel that has much humidity, the laser scale employing optical fiber cables for a laser input and outputs was developed. Because the active device like a laser diode is not suitable for such tunnel. The laser and photo diodes as thermal sources could be far placed (e.g.1km) from the scale by the fiber cables. The thermal effect from them, related to the low frequency noise of the seismometer, could be reduced.5.The observation of the vertical component of earth back ground vibration noise using our developed seismometer was carried out at the SPring-8 site. The results of the observations showed the noise level of the seismometer was 10^<-7>(m/s)/Sqrt(Hz) in a low frequency side under 0.1Hz. This noise level was several times larger than that of CMG-3T seismometer and almost the same as CMG over 0.1Hz.

本研究的目的是开发一种高灵敏度/宽频带地震计，用于全球地震学的新阶段。地震计应测量10 μ m/s以下的加速度<-9>，频率为0.003 Hz至100 Hz。研究结果如下：1.研制了稳定度小于10 Ω<-6>、频率大于1Hz时噪声小于-130dBV的直流电源; 2.研制了三台实用的旋转摆地震仪。该地震计在摆锤上安装了一个浮子计数器，以校正大气压变化对摆锤的影响，并安装了一个隔离室，以隔离大气压变化。3.使用低噪声直流电源和不使用隔离室的地震计能够测量高达10^<-10>（m/s）/Sqrt（Hz）的噪声级，几乎超过了STS-1的噪声级。II.4.为了考虑在湿度较大的地下隧道中进行观测，开发了采用光纤电缆作为激光输入和输出的激光标尺。因为像激光二极管这样的有源器件不适合这种隧道。作为热源的激光器和光电二极管可以通过光纤电缆放置在远离秤的地方（例如1 km）。利用自行研制的地震计在SPring-8场地进行了地背振动噪声垂直分量的观测。观测结果表明，在0.1Hz以下的低频侧，该地震计的噪声级为10^<-7>（m/s）/Sqrt（Hz）。该噪声级比CMG-3 T地震计的噪声级大几倍，在0.1Hz以上与CMG地震计的噪声级几乎相同。

项目成果

永久磁石による錘の反発浮上と板バネを併用した水平地動検出器の開発

使用永磁体和板簧组合重物的排斥悬浮来开发水平地面运动探测器

• 发表时间: 2003
• 期刊: 平成13-14年度科学研究補助金(基盤研究(B)(2))研究成果報告書,研究代表者・大竹雄次,課題番号13440132
• 作者: 大竹雄次;新谷昌人;渡辺好徳;肥田野和夫
• 通讯作者: 肥田野和夫

Yuji Otake, Akito Araya, Kazuo Hidano: "Development of a Highly-Sensitive/Broad-band Servo-type Seismometer using an Astable Rotational Pendulum"Proc.of IUGG, The International Union of Geodesy and Geophysics. (in CD-ROM). JSS01/30A/D-014 (2003)

Yuji Otake、Akito Araya、Kazuo Hidano：“使用非稳态旋转摆开发高灵敏度/宽带伺服型地震仪”Proc.of IUGG（国际大地测量学和地球物理学联合会）。

A network of superconducting gravimeters detects submicrogal coseismic gravity changes

• DOI: 10.1126/science.1101875
• 发表时间: 2004-10-15
• 期刊: SCIENCE
• 影响因子: 56.9
• 作者: Imanishi, Y;Sato, T;Okubo, S
• 通讯作者: Okubo, S

A horizontal vibration detector using a leaf spring pendulum and magnetic levitation of a permanent magnet

使用板簧摆和永磁体磁悬浮的水平振动检测器

• 发表时间: 2003
• 期刊: Report of Grant-in-Aid for Scientific Research(B)(2),(2001-2002)(in Japanese)
• 作者: Yuji Otake;Akito Araya;Kazuo Hidano
• 通讯作者: Kazuo Hidano

地震探査装置及び方法

地震勘探设备及方法

• 发表时间: 2004