| 摘要 |
PURPOSE:To emphasize the desired frequency, by continuously varying the pitch and pattern width of the first and second reflecting lattices, and equalizing the pitch and pattern width of the opposed position of the reflecting lattice. CONSTITUTION:An input signal is converted to an elastic surface wave by the transmission wave transducer 4, and is made incident to the first reflecting lattice. The lattice 7 makes the incident elastic surface wave reflect in the direction of 90 deg.. The elastic surface wave which has been divided into each frequency component and has been reflected is made incident to the second reflecting lattice 8, is reflected in the direction of 90 deg. over again, and it is detected by the receiving wave transducer 6. Since each frequency component is reflected by the same condition as the reflection by the first reflecting lattice, attenuation due to interference is not caused. Intensity of each frequency component reflected at each position is weighted in proportion to the lattic width at that position. |
