| 摘要 |
PROBLEM TO BE SOLVED: To provide an approach detection device capable of detecting a detection object sufficiently at the safe separation distance between a transmission line and a crane without shortening the detection distance, even when linear body having a long and narrow shape with a narrow area or width such as an overhead transmission line is the detection object, and outputting a signal having a larger amplitude than a supply voltage from a transmitter when driven by a battery. SOLUTION: A pulse signal having an amplitude on both positive side and negative side is generated at fixed time intervals by a transmission circuit 21, and amplified by an amplifying circuit 23. Then, the positive side signal and the negative side signal relative to the amplitude of the pulse signal are separated by a separation circuit 25, and the amplitude of the minus side signal is inverted by an inverting circuit 27 and added to the plus side signal by an adding circuit 29, and thereby a transmission signal having increased output is transmitted to an obstacle. COPYRIGHT: (C)2005,JPO&NCIPI
|
