| 摘要 |
A method of and apparatus for locating an object by stress wave energy reflection in which the wave energy is transmitted as a beam by transmitting transducer elements, and is scanned through successive sectors of a field of view by imposing differential transmission delays on transmitting signals fed to the elements by means of a delay line. Indicator signals are developed in receiving channels connected respectively to receiving transducers providing binaural characteristics, and transducer providing monaural characteristics but collectively covering the field. An indicator means comprises any, or any combination, of audible means, visual means or tactile means the two latter providing coordinate displays. A receiving means includes spectral analysing means for segregating the indicator signals into separate different frequency bands, and delay means for imposing differential delays compensating for transit time of wave energy reflection in the medium correlated with different range bands before coordinate display. |
