Journal of Jilin University(Engineering and Technology Edition) ›› 2025, Vol. 55 ›› Issue (6): 1923-1930.doi: 10.13229/j.cnki.jdxbgxb.20230960

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Development and application of online measurement device for water content of lubricating oil based on microwave resonance technology

Tao ZHANG1(),Qin JIANG1,Jie LIU2,Zi-jian DING1,Xue-mei HU2,Bing HAN1()   

  1. 1.College of Physics，Jinlin University，Changchun 130012，China
    2.College of Instrument and Electrical Engineering，Jinlin University，Changchun 130061，China
  • Received:2023-09-09 Online:2025-06-01 Published:2025-07-23
  • Contact: Bing HAN E-mail:zhangt@jlu.edu.cn;han@jlu.edu.cn

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Abstract:

In view of the shortcomings of the current lubricating oil water content detection technology with expensive equipment and few online measurements， an online measurement device based on microwave resonance technology was designed. It consists of resonator， microcontroller unit， coaxial transmission line， voltage-controlled oscillator， logarithmic detector and PC. Combined with the finite element simulation software HFSS， a microwave resonator was designed， and the S-parameter response curve was simulated under the state of uniform and non-uniform distribution of water and oil， and the relationship between resonant frequency and water content was obtained. In the experiment， the measurement device was fabricated to measure the relationship between resonance frequency and water content in the range of 0~1.2%， and the results are consistent with the simulation. Temperature compensation was carried out within 16~30 ℃ to improve the measurement accuracy. Finally， the device was connected to the oil pipe for on-line measurement， and the results prove the effectiveness of the measurement device.

Key words: electromagnetic measurement, lubricating oil, microwave resonance, water content, water-oil distribution

CLC Number: 

  • TN98

Fig.1

Schematic diagram of moisture content detection device"

Fig.2

Resonant cavity structure"

Fig.3

S21 Response curve of the resonator filled with pure oil under simulation"

Fig.4

Electric field distribution of the resonant cavity"

Fig.5

S21 curves of different water content under uniform state of water and oil"

Fig.6

Relationship between resonant frequency and water content of uniform water-oil mixture"

Fig.7

Non-uniform model of water-oil mixture in resonator"

Fig.8

Average moisture content of 0.3%， S21 curve simulation of uniform and non-uniform mixture"

Fig.9

Average moisture content of 0.9%， S21 curve simulation of uniform and non-uniform mixture"

Table 1

Resonant frequency of different aqueous oils"

含水率/%谐振频率/GHz频率偏移/MHz频率间隔/MHz
0.29.204 70.00.0
0.39.192 20.012.5
0.49.177 60.014.6
0.59.166 20.011.4
0.69.154 50.011.7
0.79.141 50.013.0
0.89.129 20.012.3
0.99.117 50.711.7
1.09.105 52.112.0
1.19.093 12.312.4
1.29.080 42.712.7

Fig.10

Relationship between resonant frequency and water content of non-uniform water-oil mixture"

Fig.11

Experimental detection device"

Fig.12

Relationship between resonance frequency and water content in the simulation and experiment"

Fig.13

Temperature， resonant frequency， moisture content fitting relation surface"

Fig.14

Resonant cavity online measurement"

Table 2

Comparison of online measurement and standard"

标准含水率/%温度/℃检测数据/%误差/%
0.227300.2090.018
0.233260.2120.021
0.217230.2020.015
0.242200.2310.011
0.235160.2210.014
0.717300.7210.004
0.726260.6930.033
0.707230.6880.019
0.689200.6710.018
0.692160.6810.011
1.227301.2050.022
1.223261.2350.012
1.207231.2210.014
1.191201.2090.018
1.204161.2150.011
0.174300.1880.014
0.523300.5040.019
0.012260.0190.007
0.421260.3970.024
0.329230.3670.038
0.609230.6120.003
0.431200.4220.009
0.835200.8480.013
0.921160.9440.023
1.106161.1190.013
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