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本文提出了用任意时限脉冲作激励源的一种动态校准方法,用于校准动压传感器的频响特性。文中推导了时限脉冲视作δ脉冲及半正弦波所引入频谱误差的公式,并用以确定可校准的频率范围及由激励频谱所引入的校准误差。这种校准方法使可校准的下限频率严格地达到零频,因而开辟了由静态灵敏度向动态灵敏度过渡的有效途径。目前,可校准的最高动压和上限频率分别为1000MPa和20kHz,而幅相频校准误差分别小于2％～5％和0.1°
In this paper, a dynamic calibration method using any time-limited pulse as excitation source is proposed to calibrate the frequency response of the dynamic pressure sensor. The paper deduces the formula of time-lag impulse as spectral error introduced by δ-pulse and half-sine wave and determines the calibrated frequency range and the calibration error introduced by the excitation spectrum. This method of calibration allows a calibrated lower limit of frequencies to be strictly zero frequency, thus opening up an effective avenue of transition from static to dynamic sensitivity. At present, the maximum dynamic pressure and maximum frequency that can be calibrated are respectively 1000MPa and 20kHz, while the amplitude and phase calibration errors are less than 2% ~ 5% and 0.1 °