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在许多食品中空气以分散相的形式存在,食品学家需要知道空气分散相的特性,而传统的测量技术却受到精度和使用上的限制。超声对分散气体的相体积比和线度分布十分敏感,应用适当的频散关系,超声能测出发泡液体食品的特性。传统的方法主要是通过透射测量低浓度发泡系统。实际上,分散气体在食品系统中的体积比为50％或更高,这样的系统声衰减很快,一般不可能用透射法进行测量。 本文采用具有反射脉冲Fourier分析功能的宽带
In many foods, air exists as a dispersed phase. Food scientists need to know the characteristics of an air-dispersed phase, whereas traditional measurement techniques are limited in precision and use. Ultrasound on the dispersed gas phase volume ratio and linear distribution is very sensitive to the use of appropriate dispersion relationship, ultrasound can be measured foam liquid food characteristics. The traditional method is mainly to measure low concentration foaming system by transmission. In fact, the dispersed gas in the food system volume ratio of 50% or more, such a system sound decay quickly, it is generally impossible to measure transmission method. In this paper, we use the broadband with reflection pulse Fourier analysis function