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