报道一种可用来检测和计数油液中磨粒个数的微流控芯片实验室装置（microfluidic labonchip）.使用直径为25 μm铜丝作为电极，在PDMS微流控芯片上加工获得三维电容传感器，油液样品在微流控芯片上由注射泵驱动通过传感器.金属磨粒与油液介电常数不同，每一个通过电容传感器的磨粒均会产生电容脉冲信号，脉冲信号幅值反映了磨粒大小，而脉冲个数即为磨粒数量，实现了最小粒径为8 μm的铝磨粒的检测和计数.该油液磨粒检测装置具有结构简单、成本低、检测精度高等优点，有望应用于远洋船舶的油液离线分析.
Abstract
This paper introduced a microfluidic lab-on-chip device, which could be applied to detect the metal wear debris in the oil. Driven by the syringe pump, the sample oil in the inlet well of the PDMS microfluidic labonchip passed through the capacitance detection zone which has two 25 μm-diameter copper wires acting as electrodes of a 3D capacitive sensor. Due to the different permittivity between the metal debris and the oil, each debris generated a capacitive pulse signal when passing through the capacitive sensor. The amplitude of this signal reflects the size of the grains, and the number of pulses is the quantity of the particles. With this device, the detection and counting debris of 8μm diameter are achieved. The device described is simple and inexpensive without losing high accuracy and sensitivity, which can be applied to develop a portable device for offline oil analysis onboard ships.
关键词
微流控芯片 /
电容传感器 /
磨粒检测
Key words
microfluidic chip /
capacitive sensor /
metal debris detection
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参考文献
［1］PENG Z, KESSISSOGLOU N. An integrated approach to fault diagnosis of machinery using wear debris and vibration analysis ［J］.Wear,2003,255:1221-1232.
［2］MURALI S, XIA Xingao, JAGTIANI A V,et al.Capacitive Coulter counting: detection of metal wear particles in lubricant using a microuidic device［J］.Smart Mater Struct, 2009,18:1-6.
［3］SALEH O A , SOHN L L, LETT N. Capacitance cytometry: Measuring biological cells one by one［J］. PNAS,2003, 3:37-38.
［4］KHANDAKER I I, GLAVAS E , JONES G R. A fiber optical oil condition monitor based on chromatic modulation［J］. Meas Sci Technol，1993,4（5）：8-13.
［5］DU L, ZHE J, CARLETTA J E，et al. Inductive Coulter counting: detection and differentiation of metal wear particles in lubricant［J］. Smart Mater Struct, 2010,19:38-45.
［6］XIA Xin-gao. Modeling a microfluidic capacitive sensor for metal wear debris detection in lubrication oil［D］.Akron: The University of Akron, 2009: 26-72.
基金
国家自然科学基金面上项目（51079012）；中央高校青年骨干教师基金项目（3132013027）.
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