Title: Glass electrode structure for radio capsule

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Abstract: Disclosed is a radio capsule having an electrode structure for measuring the concentration of an ionic species in an ion containing solution. A thin film conductive electrode is strongly bonded to the inner surface of a thin cylindrically shaped membrane of glass sensitive to the ionic species. A conductive lead wire makes electrical contact with the electrode. A mass of non-conductive reinforcing backing material having a thermal coefficient of expansion greater than that of the membrane strongly adheres to the conductive electrode and the membrane. The backing material is cured or solidified at a temperature sufficiently higher than that at which the electrode structure is to be used so that contraction of the backing material during curing places the membrane in a state of compression, thereby strengthening the same. The resultant electrode structure is incorporated into a radio capsule which also comprises circuitry for transmitting a signal modulated in accordance with the concentration of the measured ionic species.


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