| 摘要 |
A pressure sensor comprising a pressure-displacement transducer mechanism including a movable body driven by a hydraulic pressure to be determined and spring means for urging the movable body in a direction opposite to the pressure, and a displacement-pulse phase conversion unit including a ferromagnetic member secured to the movable body, a magnetically soft member carrying an electrical coil thereon and disposed at a stationary point adjacent to the region of movement of the ferromagnetic member and a permanent magnet. A pulse voltage is applied to one end of the electrical coil, the other end of which is connected in series with a resistor. A voltage drop across the resistor is detected, and a time lag of the voltage drop with respect to the pulse voltage, representing a displacement of the ferromagnetic member in response to a change in the hydraulic pressure, is determined and provided in the form of an analog voltage or a digital code.
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