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首页> 外文期刊>Journal of geodynamics >A 100 m laser strainmeter system installed in a 1 km deep tunnel at Kamioka, Gifu, Japan
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A 100 m laser strainmeter system installed in a 1 km deep tunnel at Kamioka, Gifu, Japan

机译：安装在日本岐阜县神冈市1公里深隧道中的100 m激光应变仪系统

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We have installed a laser strainmeter system in a deep tunnel about 1,000 m below the ground surface at Kamioka, Gifu, Japan. The system consists of three types of independent interferometers: (1) an EW linear strainmeter of the Michelson type with unequal arms, (2) an NS-EW differential strainmeter of the Michelson type with equal arms and (3) a NS absolute strainmeter of the Fabry-Perot type. These are configured in L-shaped vacuum pipes, each of which has a length of 100 m. (1) and (2) are highly sensitive (order of 10~(-13) strain) and have wide dynamical range (10~(-13)-10~(-6)). Observations with strainmeters (1) and (2) started on June 11, 2003. (3) is a new device for absolute-length measurements of the order of 10~(-9) of a long-baseline (100 m) Fabry-Perot cavity by the use of phase-modulated light. This third strainmeter will be ready for operation before the end of 2004. The laser source of strainmeters (1) and (2) is a frequency-doubled YAG laser with a wavelength of 532 nm. The laser frequency is locked onto an iodine absorption line and a stability of 2 x 10~(-13) is attained. The light paths of the laser strainmeter system are enclosed in SUS304 stainless steel pipes. The inside pressure is kept to be 10~(-4) Pa. Consequently, quantitative measurement of crustal strains of the order of 10~(-13) can be attained by employing the laser strainmeter system of (1) and (2) at Kamioka. This resolving power corresponds to that of a superconducting gravimeter. Using the laser strainmeter system, we expect to determine parameters related to fluid core resonance, core modes and core undertone as well as other geodynamic signals such as slow strain changes caused by silent earthquakes or slow earthquakes.
机译：我们在日本岐阜县神冈市地下约1,000 m的深层隧道中安装了激光应变仪系统。该系统由三种类型的独立干涉仪组成：（1）带不等臂的Michelson型EW线性应变仪，（2）带等臂的Michelson型NS-EW差分应变仪，以及（3） Fabry-Perot类型。它们配置在L型真空管中，每个管的长度为100 m。 （1）和（2）高度敏感（10〜（-13）应变的阶），并具有较宽的动态范围（10〜（-13）-10〜（-6））。从2003年6月11日开始使用应变仪（1）和（2）进行观测。（3）是一种用于测量长基线（100 m）Fabry-的10〜（-9）量级的绝对长度的新设备。珀罗腔通过使用调相光。第三台应变仪将在2004年底前投入使用。应变仪（1）和（2）的激光源是波长为532 nm的倍频YAG激光器。激光频率锁定在碘吸收线上，并获得2 x 10〜（-13）的稳定性。激光应变仪系统的光路封闭在SUS304不锈钢管中。内部压力保持在10〜（-4）Pa。因此，通过使用（1）和（2）的激光应变仪系统，可以定量测量10〜（-13）量级的地壳应变。神冈该分辨力对应于超导重力仪的分辨力。使用激光应变仪系统，我们期望确定与流体岩心共振，岩心模式和岩心底色以及其他地球动力学信号（例如，由无声地震或慢地震引起的缓慢应变变化）相关的参数。

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