Development of laser interferometer strain-seismometer

激光干涉仪应变地震仪的研制

• 批准号: 15340148
• 负责人: YAMADA Isao
• 金额: $ 10.5万
• 依托单位: Nagoya University
• 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 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15340148/
• 关键词: seismometer; laser interferometer; strain seismometer; broad-band seismometer; レーザー干渉計; 超長周期地震計; レーザー干渉型歪み計

We developed the strain-seismometer which used a laser interferometer in this project. This year, we did observation with this super long period seismometer and did comparison with a record of quartz pipe strain meter and STS -1 type broad-band seismometer.As a result it does not extend to performance of a STS -1 type seismometer.We can get a good record by revising atmospheric pressure and a change of minute temperature in an observation trench. The cause of noise is understood that it was warp of the laser interferometer by around 1/100 deg.temperature change in a trench by observation of temperature by an exact thermometer and observation of atmospheric pressure change by a micro-barometer.The developed strain seismometer seems to do warp by temperature more greatly, because various kinds of materials are used every a part by difficulty and a price of production. I have to build the system which is not influenced in a temperature change by materials of super iron-nickel alloy with a little temperature changes.

在这个项目中我们开发了使用激光干涉仪的应变地震仪。今年我们用这个超长周期地震仪进行了观测，并与石英管应变仪和STS -1型宽带地震仪的记录进行了比较，因此并没有延伸到STS -1型地震仪的性能。我们可以通过修正观测沟内的大气压和微小温度的变化来获得良好的记录。通过精密温度计观测温度和微气压计观测大气压变化，了解到噪声的原因是激光干涉仪的扭曲，约1/100℃，沟槽内的温度变化。开发的应变地震计由于生产的难度和价格，每个部件都使用了各种材料，因此似乎会因温度而产生更大的变形。我必须使用温度变化很小的超级铁镍合金材料来构建不受温度变化影响的系统。