权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

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

基本信息

批准号：
13440132
负责人：
OTAKE Yuji
金额：
$ 9.6万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13440132/
关键词：
seismometer magnetic levitation permanent magnet highly sensitive wide band horizontal pendulum long period magnetic spring

项目摘要

levitation for a pendulum weight. The levitation employs permanent magnets magnetized by N, S strip, alternatively. This pendulum has been built and evaluated by experiments. The results of the experiments are as follows. 1. The prototype of the pendulum achieved a natural period more than 11 s. 2. The natural period of the prototype was changed with a magnetic spring. These values of the period were consistent with theoretical calculations. 3. The prototype with a feedback control circuit, a feedback control coil and a capacitance displacement sensor worked as a servo-type seismometer. 4. The observations using the magnetic levitation seismometer have been carried out and showed capacity to measure microseisms.In addition to the above mentioned results, fabrication method for the control circuit was improved to achieve further low noise. The control circuit employs Strip Line technology that a microwave circuit usually uses. The Strip Line can improve isolation between devices on the circuit board. The structure of a DC 10 V power supply for the control circuit was also modified for obtaining long term voltage stability and low noise. This feature of the modification is using a battery connected between DC regulators. One regulator of them is to convert from AC 100V to DC 13 V. After this circuit, there is the battery. The DC 10 V regulator is connected to the battery. This power supply showed the noise level above 1Hz is about -140 dBV and the long-term voltage stability is order of 10^<-6>.

摆重的悬浮。悬浮采用N、S带交替磁化的永磁体。这个摆是通过实验建造和评估的。实验结果如下。 1、摆锤原型实现了11秒以上的自然周期。 2.用磁力弹簧改变原型的自然周期。该时期的这些值与理论计算一致。 3、样机带有反馈控制电路、反馈控制线圈和电容位移传感器，作为伺服式地震仪。 4.利用磁悬浮地震仪进行了观测，并显示出测量微震的能力。除了上述结果之外，还改进了控制电路的制作方法，以实现进一步的低噪声。控制电路采用微波电路通常使用的带状线技术。带状线可以提高电路板上器件之间的隔离度。控制电路的直流10V电源的结构也进行了修改，以获得长期的电压稳定性和低噪声。该修改的特点是使用连接在直流稳压器之间的电池。其中一个调节器是将交流100V转换为直流13V。在该电路之后是电池。 DC 10 V 稳压器连接到电池。该电源显示1Hz以上的噪声水平约为-140 dBV，长期电压稳定性为10^<-6>量级。