Journal
MEASUREMENT SCIENCE AND TECHNOLOGY
Volume 24, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-0233/24/7/075106
Keywords
sensitivity; oil debris detection; machine health monitoring; inductive pulse sensor
Funding
- National Science Foundation [CMMI-0968736]
- National Natural Science Foundation of China [51128601]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0968736] Funding Source: National Science Foundation
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Detection of small metallic wear debris is critical to identify abnormal wear conditions for prognosis of pending machinery failure. In this paper we applied an inductance-capacitance (LC) resonance method to an inductive pulse debris sensor to increase the sensitivity. By adding an external capacitor to the sensing coil of the sensor, a parallel LC resonance circuit is formed that has a unique resonant frequency. At an excitation frequency close to the resonant frequency, impedance change (and thus change in voltage output) of the LC circuit caused by the passage of a debris particle is amplified due to sharp change in impedance at the resonant peak; thus signal-to-noise ratio and sensitivity are significantly improved. Using an optimized measurement circuit, iron particles ranging from 32 to 96 mu m and copper particles ranging from 75 to 172 mu m were tested. Results showed that the parallel LC resonance method is capable of detecting a 20 mu m iron particle and a 55 mu m copper particle while detection limits for the non-resonance method are 45 and 125 mu m, respectively. In contrast to the non-resonant method, the sensitivity of the resonance method has been significantly improved.
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