Ultrasonic based unit for online monitoring of particle size distribution

一种新的技术，用于在线测量的颗粒特性在密集和不透明的系统将通过建立一个工作原型的新的颗粒尺寸分布（PSD）测量技术。在过去的几年里，这项技术在我们的实验室里得到了发展和进步。它主要基于超声波在介质中传播的衰减谱，需要快速采集时域信号以供在线应用。在我们的实验室中，使用可用的硬件已经证明了这种技术的概念和在线测量能力的实验室规模的应用。对于快速过程，如结晶，更快的数据采集速率将有助于信号平均化并提高输出质量。新的硬件原型将是一个单一的单元，能够快速生成，接收和数字化稳定的宽带超声波脉冲的信号特性的在线控制。我们实验室开发的用于数据采集、处理和显示粒度分布的图形用户界面将与定制的硬件集成。该原型将用于研究该装置在选定结晶过程的不同阶段的控制适用性。将研究在不正常或不正常情况下测量的准确性，以提供额外的信息和适当的警告。粒子的形式，形状和结构对信号特性和最终测量的PSD的影响将被详细研究，并与其他技术进行比较。

A novel technique for online measurement of particles characteristics in dense and opaque systems will be demonstrated by building a working prototype of the novel particle size distribution (PSD) measurement technique. This technique has been developed and advanced in our laboratory over the last few years. It is mainly based on attenuation spectroscopy of ultrasonic wave propagating through the media and requires rapid acquisition of the time domain signal for online applications. The proof of concept and online measurement capability of this technique for bench scale applications have been demonstrated using available hardware in our laboratory. For rapid processes such as crystallization a faster data acquisition rate will facilitate signal averaging and enhance the quality of the output. The new hardware prototype will be a single unit capable of rapidly generating, receiving and digitizing stabilized broadband ultrasonic pulses with online control of the signal characteristics. The graphical user interface developed in our laboratory for data acquisition, processing and display of particle size distribution will be integrated with the customized hardware. The prototype will be used to study applicability of the unit for control at different stages of selected crystallization processes. The accuracy of measurements under upset or abnormal conditions will be studied to provide additional information and appropriate warning. The effects of particle form, shape and structure on signal characteristics and final measured PSD will be investigated in detail and compared with other techniques.