| 摘要 |
PURPOSE:To heighten reliability of measurement by synthesizing two waves which have near carrier frequencies and composing synthesized amplitude with prescribed normal value. CONSTITUTION:Electric oscillations of frequencies f1, f2 which synchronize with normal signals generated at the generating part 1 of a time axis and are generated at synchronizing oscillating parts 2, 2a are transmitted to media as supersonic waves of the frequencies f1, f2 through transmitting/receiving shared parts 3, 3a and transmitting/ receiving wave parts 4, 4a. Next, the supersonic waves of the frequencies f1, f2 transmitted to the media are reflected by a measuring object 8, received 4, 4a, converted into electric oscillations, and transmitted to an adder 10 through the shared parts 3, 3a. Further, in the adder 10 the receiving signals of the frequencies f1, f2 are added and synthesized, synthesized waves are amplified 5, and transmitted to an amplitude comparing/time measuring part 6. In the measuring part 6 the amplitude of the synthesizes waves is compared with a prescribed threshold, receiving normal signals are output at the time when the amplitude of the synthesized waves exceeds the threshold, first of all commenced time measurement is ended as soon as the supersonic waves are transmitted, and measured time is output. The measured time is transmitted to a distance operation part 7 and the distance up to the object 8 is calculated. |
