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A Novel, High-Frequency, Reciprocal Calibration Method for Dynamic Pressure Sensors Used in High-Speed Flows

机译:高速流量中使用的动态压力传感器的新颖,高频,相互校准方法

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This paper describes a new calibration method capable of replacing shock-tube measurements as a means of obtaining high-frequency calibration data for microphones and dynamic pressure sensors that utilize reciprocal transduction mechanisms (e.g., piezoelectric and electrostatic sensors). The reciprocal nature of these sensors allows the response to be determined over a broad frequency range via electromechanical actuation (up to and beyond 1 MHz) with the potential for NIST traceability, extending the calibration range far beyond what is typically achievable via acoustic calibration methods (~20 kHz). A piezoelectric aeroacoustic microphone is used to demonstrate the calibration process, showing excellent agreement between the frequency responses measured in an acoustic plane wave tube and using a laser vibrometer. Frequency response data for the microphone is provided up to 200 kHz and for dynamic pressure sensors up to 1.25 MHz (beyond the sensor resonances of 170.7 kHz and 675 kHz, respectively), demonstrating the ability to calibrate sensors over the entire measurement bandwidth.
机译:本文介绍了一种新的校准方法,该方法能够代替激振管测量值,以此作为获取麦克风和动压传感器的高频校准数据的一种手段,这些传感器和传感器采用的是相互转换的机制(例如,压电和静电传感器)。这些传感器的互惠性使得可以通过机电致动(高达1 MHz或更高)在很宽的频率范围内确定响应,并具有NIST溯源的潜力,从而将校准范围扩展到远远超过通常通过声学校准方法可达到的范围( 〜20 kHz)。压电式气动麦克风用于演示校准过程,显示出在声平面波管中测量的频率响应与使用激光振动计之间的出色一致性。为麦克风提供的频率响应数据高达200 kHz,为动压传感器提供的频率高达1.25 MHz(分别超过了170.7 kHz和675 kHz的传感器共振),从而证明了在整个测量带宽上校准传感器的能力。

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