Pneudraulic Resonated Sine Pressure Generator

摘要

In this paper, it introduces a kind of sine pressure generator, which is used both in absolute and in relative calibration with liquid as medium. Main features of new device are that amplitude ratio is considerable increased by adoption of simultaneous adjusting technology both in air-inlet and air-outlet, gas sine pressure generator as pressure supply and liquid as calibrating medium. Within range of practical application frequency from 0 to 5000Hz, amplitude ratio can reach more than 1 and in low frequency rang and resonance zone, amplitude ratio can reach to 2, that is to say, wave trough value is near to zero and wave crest value is near to pressure value of source. So it realizes alternating calibration of sensors in full range. Because gas sine pressure generator has excellent sine protractor and fluid column's resonance principle is used, it can generate standard sine wave which range from 0 to 6000Hz. At resonance point, its pressure can reach to -0.05Mpa and it can be effectively used to examine sensor's character in condition of negative pressure. Operation principle of this new sine pressure calibration device will be introduced in this paper and some practical wave patterns are also shown.