EuroWire July 2020
Technical Article
RFID technology has the advantage of a strong anti-jamming ability of data acquisition, with no need to touch the optical cable, and it can obtain the information of the optical cable through scanning in a controllable distance range, so as to reduce the wear problem caused by printing. 3.2 Radio frequency identifiable cable structural features Hengtong adopts a special long-distance “electronic label” of non-drying adhesive, which is based on flexible polyethylene terephthalate (PET). It belongs to a new generation of passive ultra-high frequency radio frequency identification transponders, and its working frequency covers the whole band of 860-960 MHz. It can ensure stable use at ambient temperatures of -20 to +80°C, and has the advantages of being anti-corrosion, waterproof and anti- electromagnetic. On this basis, a kind of radio frequency identifiable fibre optic cable is developed. The special “electronic tag” radio frequency chip is coated between the inner and outer sheaths through the double sheath production process, which ensures that the radio frequency chip can be closely fitted without displacement due to the bending or pulling of the fibre optic cable. In order to ensure real-time and effective access to information in the production process, the chip cladding spacing is 2 metres. The structure design of radio frequency identifiable optical cable is shown in Figure 5 . The RF chip used in the radio frequency identifiable optical cable is actually a passive UHF radio frequency identification transponder. The diagram of the chip is shown in Figure 6 . The chip is about 104 x 5.5mm in size and can be used at temperatures ranging from -20 to +80°C. The performance of the chip is shown in Table 1 .
No Item
Standards and requirements
Result
Conclusion
Long-term tension value: 200N; strain value of optical fibres ≤0.2%
0.165% Qualified
Tensile strain
Short-term tension value: 400N; strain value of optical fibres ≤ 0.4%
0.386% Qualified
Almost no additional decay Almost no additional decay No cracking, identifiable Almost no additional decay
Long-term tension value: 200N; no obvious residual additional attenuation No obvious residual additional attenuation after pulling force is removed
1
Qualified
Additional tensile attenuation
Qualified
No visible cracking; RF chip is identifiable
Qualified
Long-term tension value: 1,100N; no obvious residual additional attenuation Short-term tension value: 2,200N; additional attenuation of optical fibres ≤0.4dB
Qualified
2 Flattening
0.032 dB Qualified
No cracking; identifiable
No visible cracking; RF chip is identifiable
Qualified
4.5N•m, at least three times, additional attenuation of optical fibres ≤0.4dB 0.01 dB
Qualified
3 Impact
No cracking; identifiable
No visible cracking; RF chip is identifiable
Qualified
40N, 10D, 25 times, additional attenuation of optical fibres ≤0.4dB 0.007 dB Qualified
4 Repeated bending
No cracking; identifiable
No visible cracking; RF chip is identifiable
Qualified
40N, torsion length 1m, torsion angle ±180°, ten times, additional attenuation of optical fibres ≤0.4dB
0.009 dB Qualified
5 Torsion
No cracking; identifiable
No visible cracking; RF chip is identifiable
Qualified
Radio frequency chip
40N, 10D, 30 times, additional attenuation of optical fibres ≤0.4dB 0.004 dB Qualified
6 Flexibility
No cracking; identifiable
No visible cracking; RF chip is identifiable
Qualified
10D, winding cycles: six cycles per cycle, ten times, additional attenuation of optical fibres ≤0.4dB
0.002 dB Qualified
7 Wind
▲ ▲ Figure 5 : Radio frequency identifiable cable structure
No cracking; identifiable
No visible cracking; RF chip is identifiable
Qualified
▲ ▲ Table 2 : Experimental results
▲ ▲ Figure 6 : Radio frequency chip
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July 2020
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