Metal Embedded Optical Fiber Temperature Measurement

In machinery, aerospace, electric power and other industries, the need of metal surface temperature monitoring is very common, such as power cable lines, high temperature steam pipes and so on. Through temperature monitoring, other physical quantities marked by temperature could be analyzed.

Figure 1 Oil bath pot with a pure copper sample in it

Figure 1. Oil bath pot with a pure copper sample in it

Figure 1 shows the temperature test using the constant temperature oil bath pot. Temperature measurement is carried out by OSI-S and the layout of optical fiber is embedded type. Nine temperature test points are set.

Figure 1 Oil bath pot with a pure copper sample in it

Figure 2. Measurement result of OSI-S

Figure 3 Temperature fitting curve

Figure 3. Temperature fitting curve

Temperature /℃ 40.2 49.8 59.7 69.6 79.8 89.9 99.7 109.6 119.7
Relative deviation / % 0.6456 0.1363 1.3749 2.0471 1.1500 1.2377 0.4624 0.7353 0.6264

Table 4. Measurement deviation

The result that temperature fluctuations are small along the optical fiber during measurement indicates the effectiveness and rationality of embedded optical fiber measurement. The maximum relative deviation between average of each measured temperature and actual temperature is less than 2%(Figure 2、3、4).The measurement system is of high stability and the accuracy can reach ±0.1℃.




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