| 摘要 |
PROBLEM TO BE SOLVED: To obtain an absolute range finder without being substantially affected by disturbance such as environmental changes in a long distance. SOLUTION: A high frequency pulse is applied to one end of a parallel conductor 38 in which an impedance is regarded as being equally distributed and an impedance mismatching detector 2 is installed in the course of the parallel conductor 38. Now, a reflected wave is generated by the impedance mismatching detector 2 and the time is measured until the wave is returned back. The time is multiplied by a propagation speed of a voltage to measure the distance to the impedance mismatching detector 2 from the applied position at the end of the parallel conductor.
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