A robust, low-cost and well-calibrated infrasound sensor for volcano monitoring
A robust, low-cost and well-calibrated infrasound sensor for volcano monitoring
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DOI：
10.1016/j.jvolgeores.2019.106668
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发表时间：
2019-12-01
影响因子：
2.9
通讯作者：
Lesage, Philippe
中科院分区：
文献类型：
--
作者：
Grangeon, Jacques;Lesage, Philippe
火山声波信号包含有关浅层岩浆和热液作用的宝贵信息。在某些情况下，声波的探测是火山爆发发生的唯一明确证据。因此，他们的研究是对地震信号的补充。因此，声学传感器越来越多地被集成到火山监测系统以及临时仪器部署中。我们开发了一种宽带、坚固和低成本的次声传感器，旨在检测和分析火山上的声波。它基于微机电式差压传感器(MEMS)。参考压力通过气动高通过滤器与大气压力保持平衡。它的低角频率通常设置为60兆赫，可以从几个兆赫调整到几十兆赫。它的幅度范围为+/-240 pA，灵敏度为20 mV pA-1，噪声电平为100赫兹，采用两个专门设计的校准系统，提供正弦压力变化。传感器的机械元件由3D打印机生产，并填充了环氧树脂，确保了在大多数火山侵蚀性环境下的高耐用性。传感器的尺寸(26x45x80 Mm)和重量(100克)使其非常易于操作和安装。(C)2019爱思唯尔B.V.保留所有权利。
Volcano acoustic signals contain valuable information on shallow magmatic and hydrothermal processes. In some cases, the detection of acoustic waves is the only clear evidence of the occurrence of volcanic explosions. Their study is thus complementary to that of seismic signals. For this reason, acoustic sensors are more and more frequently integrated in volcano monitoring systems as well as in temporary instrumental deployments. We have developed a broadband, robust and low-cost infrasound sensor designed for the detection and analysis of acoustic waves on volcanoes. It is based on a microelectromechanical differential pressure transducer (MEMS). The reference pressure is balanced with the atmospheric pressure through a pneumatic high-pass filter. Its low corner frequency, usually set to 60 mHz, can be adjusted from a few to tens of mHz. Its amplitude range is +/- 240 Pa and its sensitivity is 20 mV Pa-1, with a noise level 100 Hz using two specially designed calibration systems which deliver sinusoidal pressure variations. The mechanical elements of the sensor are produced by 3D printer and filled with epoxy resin which guarantees high robustness in the aggressive environment of most volcanoes. The sensor dimensions (26x45x80 mm) and weight (100 g) makes it very easy to handle and install. (C) 2019 Elsevier B.V. All rights reserved.