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由矿业局SPOKANE采矿研究中心研制的探测顶板破坏的预警器,可简便地装设在矿井顶板或两帮的标准锚杆钻孔内。这种仪器可监测到岩石表面至锚固在其任何适宜深度之间的岩石交形。它可以用来监测岩石冒落及其变形,以获得随时间变化的岩石移动的数据。这是一种适合煤矿使用的廉价仪器。由于安装时所具有的可靠性,则很少会受矿井开采作业的影响。当岩石变形达到极限值时(在零至2(1/2)英寸内),预警器将向邻近矿区的无线电接收机发出预警信号。多数探测顶板破坏的传感器总成本低于50美元。并可利用任何一种标准无线电接收器接收信号。当然还可研制一种小型廉价的个人接收机供邻近矿区的矿工们使用。
Developed by the SPOKANE Mining Research Center of the Mining Bureau, early warning devices for detecting roof damage can be easily installed in standard bolt holes in the mine roof or two gangs. This instrument monitors the rocky surface to rocky formations anchored at any suitable depth. It can be used to monitor rock fall and its deformation to obtain data on rock movements over time. This is a cheap instrument for coal mine use. Due to the reliability of the installation, it is seldom affected by mine operations. When rock deformation reaches a limit (within zero to two (1/2) inches), the early warning device will send an early warning signal to the radio receiver in the adjacent mine. Most sensors that detect roof damage cost less than $ 50. And can use any kind of standard radio receiver to receive signals. Of course, a small, inexpensive personal receiver can be developed for use by miners in nearby mines.