| 摘要 |
PURPOSE:To measure varying wave height accurately by dipping tips of an oscillation line made of electric resistance material and a detection line made of good-conductivity material into a liquid, applying an AC voltage to the oscillation line, and detecting the voltage at the liquid contacting part of the oscillation line on the detection line through the circumference of the liquid surface. CONSTITUTION:A 2.3kHz sine wave signal from the two-phase oscillation circuit 20 of a signal output part 2 is amplified by an amplifier 21 to apply a constant- voltage AC signal to the oscillation line 40 made of the electric resistance material, such as a nichrome wire, of a detector 4. Then, the detection signal from the detection line 41 made of stainless steel wire is outputted to a recorder 6 and a display device 60 through the AC amplifier 50, high-pass filter 51, full- wave rectifier 52, DC amplifier 53, low-pass filter 55, and DC amplifier 57 of a signal conversion part 5, and displayed. |
