声速传感器测量结果中气压附加成分的发现

Discovering air pressure appended effect in sound velocity measurement result with ultrasonic sensor

气体测量,如空气的测量是非常复杂的一项课题,涉及到诸如超声学、空气动力学、流体力学、电子学、材料学、制冷和计算机应用等多门学科。即使在线性声学条件下气体中声速的精确测量,也颇为复杂[1]。本文在局部小环境下,使用超声波传感器测量声速的过程中,发现了气压变化与声速变化之间的变化规律。运用工程的方法,提出了声速一阶微分方程,解释了气压波动对声速的影响,对今后声速在气体中的精确计算与测量有一定的应用价值。这一计算公式还需要通过大量的物理实验来进一步验证。

It is known that air surveillance, for example, aerometry, is a very complex task involving ultrasonics, aerodynamics, hydromechanics, electronics, material science, refrigeration science, computer application and other science subjects. It＇s very difficult to measure velocity of sound in gas accurately, even in the area of linear acoustics. In this paper, the author discovers the relationship between air pressure and velocity of sound using ultrasonic sensor in local microenvironment. Using engineering method, a first-order differential equation was proposed which describes this phenomenon. The equation will be valuable to some extent in future working and studying. This equation still needs to be proved for its correctness through a lot of physical experiments.