| 摘要 |
<p>PURPOSE:To deal with various soil features and to make an accurate survey in a necessary direction by including a signal processing function in >=2 provided antenna parts respectively. CONSTITUTION:A shield machine main body 20 has antenna parts 11 - 1i arranged at proper places according to the shape conditions and operation conditions of the machine. Then electronic circuits consisting of antenna control circuits 121 - 12i, pulsers 131 - 13i, and reflected signal processing circuits 141 - 14i are included in those antenna parts. When an operator selects an antenna part, a computer 7 sends a signal where a corresponding call code is generated and mixed to a control signal transmission cable 6a. The selected antenna part sends an electromagnetic wave 1a through its electronic circuit and receives the reflected electromagnetic wave 1b from the natural ground to send out a digital signal including reflection information to a reflected signal transmission cable 6b. Thus, the antenna parts are freely selected to make an accurate survey without any dead angle.</p> |
