海底电缆绝缘油传感器的标定方法研究及优化*

doi:10.11978/2025141

Abstract

Abstract:

Marine cable insulation oil sensors are primarily applied for detecting extremely low concentrations of insulating oil in seawater. Compared to conventional water-oil sensors, the detection of insulating oil imposes stricter requirements on sensor calibration processes and the preparation of standard solutions. This paper introduces a novel calibration scheme that features a non-contact inverted calibration structure designed to reduce contamination risks, thereby enhancing operational convenience and calibration accuracy. Additionally, ultrasonic emulsification technology is employed to prepare standard solutions that more closely resemble the natural water-oil emulsion state formed during seawater oil spill accidents. A systematic investigation into calibration-influencing factors reveals that environmental light interference is negligible, whereas controlling the liquid level height is critical to minimize signal interference at the gas-liquid interface. A subsequent comparative analysis with industry-standard methods demonstrates that the relative deviation of the calibration results under this scheme ranges from 6% to 10%, exhibiting excellent accuracy within the target concentration range. This method provides highly reliable technical support for marine ecological environment monitoring.

Key words: insulating oil, sensor, ultraviolet fluorescence method, calibration

CLC Number:

P714.4

ZHUANG Ruixue, XU Zhantang, SHI Zhen, ZHANG Jun, XIE Mengyuan, XIONG Lanlan, HU Xin, ZHAO Kequan. Research and optimization on calibration of marine cable insulation oil sensors^*[J].Journal of Tropical Oceanography, 2026, 45(1): 188-197.

Figures/Tables 7

Fig. 1

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References 38

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组别	空白信号值	0.52mg·L⁻¹信号值	0.79mg·L⁻¹信号值
实验组(阳光照射)测量值	0.0182008	0.0578266	0.0768013
	0.0182312	0.057790875	0.0766355
	0.0181955	0.0579012	0.0764461
平均值	0.01821±(4.8×10⁻⁴)	0.05782±(8.7×10⁻⁴)	0.07663±(6.8×10⁻⁴)
对照组(遮光条件)测量值	0.018188	0.0578846	0.0767259
	0.0182776	0.0578263	0.0769018
	0.0182434	0.0579099	0.0762525
平均值	0.001824±(5.1×10⁻⁴)	0.05787±(6.3×10⁻⁴)	0.07663±(7.4×10⁻⁴)
P	0.83199	0.80012	0.99593

编号	加标浓度/(mg·L^-1)	水样浓度/(mg·L^-1)	回收率
1	1.970	0.132	97.31%
2	2.007	0.131	99.36%
3	2.003	0.130	99.16%
4	0.945	0.138	106.95%
5	0.945	0.132	107.65%
6	0.945	0.131	107.70%

样品编号	测定次数	本方法测量浓度/(mg·L⁻¹)	荧光光度法测量浓度/(mg·L⁻¹)	相对偏差
1	1	0.384	0.366	6.11%
	2	0.383	0.377
	3	0.380	0.338
	平均值	0.382	0.360
2	1	0.788	0.772	5.72%
	2	0.791	0.753
	3	0.791	0.718
	平均值	0.790	0.748
3	1	1.982	1.791	9.49%
	2	1.987	1.792
	3	1.991	1.860
	平均值	1.987	1.814
4	1	3.594	3.379	5.88%
	2	3.604	3.410
	3	3.605	3.415
	平均值	3.601	3.401

Research and optimization on calibration of marine cable insulation oil sensors^*

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Research and optimization on calibration of marine cable insulation oil sensors*

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Research and optimization on calibration of marine cable insulation oil sensors^*