| 摘要 |
A Wireless communications protocol/method comprises: a. Sensors data size and structure are constant, and consist of several fields; b. The sensors message include one or more of the following: 1) a 8 to 16 bits long preamble of a start sequence, for example a binary 1010 . . . binary sequence 2) a sync sequence of for example 8 bits of a 11001100 sequence 3) a sensor's unique ID number of for example 8 to 16 bits 4) several bits of sensor's internal clock counter 5) several bits indicating the message type 6) data, for example 16 bits of data, and/or 7) CRC (for Cyclic Redundancy Check purposes), for example 8 to 16 bits. A method for detecting leakage from a pipe uses multiple channels/inputs, wherein a low frequency range input measures seismic noises, and a high frequency range input measures cavitation noises.
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