| The exploration of the marine electromagnetic field is a high and new technology in marine science research. Because the marine electromagnetic field is extremely weak and mainly low frequency signal, the manufacture of high performance marine sensor becomes an important research among marine electromagnetism survey. In accordance with specific characteristic of high pressure blue water and problems in practical application of marine sensor,this dissertations puts forward electrode qualifications of the sensor. It is obvious that Ag/AgCl all-solid-state electrode is suitable for marine survey through analysis. The electrochemistry principle and fabrication process of Ag/AgCl all-solid-state electrode was expounded in detail in this dissertations. Electrochemical noise(EN), stability, signal response were tested and the corresponding data was analyzed. The results show that the Ag/AgCl all-solid-state electrode studied is characteristic of lower noise, good stability, high precision, and enduring high pressure.Frequency domain analysis is a conventional method of electrochemical noise. The regular pattern of electric potential signal varying with time was transformed into PSD curve through FFT transform processing. The noise of Ag/AgCl all-solid-state electrode tested and analyzed is below 10nV/ Hz at 1 Hz, and this completely satisfies the qualification of electrode noise. The electrode noise influenced by electrode area, sinter technology, material ratio was studied in this thesis. The EN appeared decreases with the increase of electrode area. The Ag/AgCl all-solid-state electrode with EN below 1nV/ Hz at 1 Hz was produced through technology optimized, which qualification has reached the advanced level of the same kind in the world. |
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