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.
Key words
microfluidic chip /
capacitive sensor /
metal debris detection
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
［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.
PDF(639 KB)
