| 摘要 |
PURPOSE:To stabilize a continuous measurement for a long time by measuring the salt concentration of sea water based on an oscillation frequency. CONSTITUTION:A salt concentration sensor is made up of an operation amplifier 1 comprising a C-MOSIC and the like and an oscillation circuit 10 composed of a feedback circuit 4 comprising a resistance 2 and a capacitor 3 connected between input and output terminals 1A and 1B of the amplifier. A pair of electrodes 5A and 5B as opposed to each other being isolated and made immersible into sea water W serve as a resistance element of the circuit 4. When the electrodes 5A and 5B are sunk into sea, current flows between the electrodes according to salt concentration of sea water and the sensor makes an oscillation.
|
