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柴油机和内燃机气缸中的压力测量,其条件相当困难,这是由于连接传感器和气缸的引压管的管壁温度高达350°～500℃。而充满引压管的气体温度约为其平均值。在这种情况下,快速流动过程的测量和记录,只有在传感器敏感元件被强制冷却时,才是可能的。在不良条件下,引压管可能成为被记录波形的主要畸变源。原因是引压管连同传感器腔体都充满着弹性气体,而形成了一个压力振荡系统。致使压力传递精度同引压管的频率特性直接有关。它可以按声波在气体介质中的传播理论来计算。
Diesel and internal combustion engine cylinder pressure measurement, the conditions are quite difficult, which is due to the pressure sensor tube and the sensor connected to the tube wall temperature as high as 350 ° ~ 500 ℃. The temperature of the gas filled with the pressure pipe is about the average value. In this case, the measurement and recording of rapid flow processes are only possible when the sensor-sensitive elements are forced to cool. Under adverse conditions, the lead tube may become the main source of distortion in the recorded waveform. The reason is that the piezotube together with the sensor cavity is filled with elastic gas, forming a pressure oscillation system. Resulting pressure transmission accuracy with the frequency characteristics of the direct correlation. It can be calculated based on the propagation theory of sound waves in gas media.