标题: Wireless Communication With Mine [打印本页] 作者: choi 时间: 7-20-2010 11:08 标题: Wireless Communication With Mine 本文通过一路BBS站telnet客户端发布
Kris Maher, New Tool May Reach Trapped Miners;
Lockheed Martin Is Testing Wireless Communication System to Help Locate
Workers After Accidents
Wall Street Journal, July 20, 2010.
http://online.wsj.com/article/SB10001424052748704720004575377232010729558.html
("to send a fully wireless signal through the layers of earth and rock above
mines. * * * Using the magnetic waves, the system has successfully
transmitted signals through mines to depths in excess of 1,550 feet in tests
. Radio waves, by contrast, can usually penetrate only a few feet of earth")
Note:
(a) Sago Mine disaster