Microdispersion droplet optical fiber detection

doi:10.11949/0438-1157.20230676

Abstract

Abstract:

Microdispersion is an important part of microchemical technology. The traditional method of analyzing and counting microdispersed droplets using the microscopic camera is costly and difficult to be promoted. This paper proposes a microdispersion droplet online detection technology based on fiber optic sensing. The method is based on diffuse reflective fiber, optical fiber sensor, data acquisition card, and LabVIEW program to detect droplet generation frequency and length in microchannels online. The method meets the detection of droplets with a diameter over 0.21 mm, and the upper limit of detection frequency is 500 Hz. When the droplet passes through the fiber for more than 15 ms, the method can also detect the droplet length. The results show that fiber diameter and fiber sensor response time are the main factors affecting the detection performance of the method. Compared with similar platforms, higher detection performance has been achieved at a lower cost.

Key words: microchannel, microdispersion, photoelectric detection, optical fiber sensor, droplet detection

摘要：

微分散是微化工技术的重要组成部分，传统利用显微摄像分析和统计微分散液滴的方法成本高，不易推广。提出了一种基于光纤传感的微分散液滴在线检测技术，该方法基于漫反射光纤、光纤传感器、数据采集卡和LabVIEW程序实现了微通道内液滴生成频率和长度的在线检测，满足0.21 mm以上直径液滴的检测，检测频率上限为500 Hz，当液滴通过光纤时间超过15 ms时，还可检测液滴长度。研究结果表明光纤直径和光纤传感器响应时间是影响该方法检测性能的主要因素，与相似平台对比，以较低的成本实现了较高检测性能。

关键词: 微通道, 微分散, 光电检测, 光纤传感器, 液滴检测

CLC Number:

TQ 025.5

Weigu WEN, Zhihong YUAN, Kai WANG, Guangsheng LUO. Microdispersion droplet optical fiber detection[J]. CIESC Journal, 2024, 75(1): 211-220.

温唯谷, 袁志宏, 王凯, 骆广生. 微分散液滴的光纤检测研究[J]. 化工学报, 2024, 75(1): 211-220.

Figures/Tables 11

Fig.1 Schematic diagram of diffuse reflection optical fiber structure and light path of detection area

Fig.2 Structure diagram of fiber optic detection platform

Fig.3 120 Hz/0.373 mm square waves and the corresponding microscopic image of droplets

Fig.4 Cross-flow shearing microchannel with fiber optic interface

Fig.5 Experimental results of performance testing for fiber optic detection method (DOF=0.50 mm，τ=1 ms)

Fig.6 Experimental results of performance testing for fiber optic detection method (τ=1 ms)

Fig.7 Experimental results of performance testing for fiber optic detection method (DOF = 0.50 mm，τ = 10 ms)

Fig.8 Representative waveforms in 10 ms response time sensor experiment

Fig.9 120 Hz generation frequency/0.37 mm dimeter experimental waveforms (partial)

Fig.10 Experimental results of droplet length detection

Table 1 Cost and performance comparison of testing platforms

检测平台	平台组件及数量	频率检测上限/Hz	可检测最小液滴直径/mm
本工作	光纤（1根）、数字光纤传感器（1个）	500	0.21
文献^[31]	光纤（2根）、LED光源（1个）、光电传感器（1个）	200	0.15
文献^[32]	激光光源（1个）、透镜（1个）、滤光片（多个）、CCD传感器（2个）	10	0.26
文献^[33]	激光光源（1个）、光纤（1根）、光纤准直器、光电传感器、放大及滤波电路（1组）	1000	0.01

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