发明名称 |
Echo sounders |
摘要 |
An echo sounder has conventional transducer means for transmitting and receiving pulses of energy and display means for providing a display indicative of the period between the transmission of a pulse of energy and the receipt of an echo pulse. The echo sounder includes suppressor means defining a variable alarm window during which period alone echo pulses are passed to an alarm device. In an embodiment designed for marine applications the display means comprises a rotor arm carrying a first light emitting device connected to the transducer means and a second light emitting device energised during the alarm window. A motor is provided for rotating the rotary arm which co-operates with a scale. An alarm device responds to each echo signal occurring during the variable alarm window.
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申请公布号 |
US4186371(A) |
申请公布日期 |
1980.01.29 |
申请号 |
US19770860897 |
申请日期 |
1977.12.15 |
申请人 |
SPACE AGE ELECTRONICS LTD |
发明人 |
MULLEY, ALAN J;TOUBKIN, WALTER M |
分类号 |
G01S7/527;G01S7/536;G01S15/10;G01S15/14;G01S15/18;(IPC1-7):G01S9/68 |
主分类号 |
G01S7/527 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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