In the railway transportation system, the rail plays the role of supporting the train and guiding the wheels of the vehicle. If there is rail fracture, it may cause train, overturn and other major traffic safety accidents, resulting in casualties and huge property losses. Therefore, more and more attention has been paid to the detection of rail damage.

    At the same time, with the development of national high-speed railway and heavy-duty railway, the degree of rail extrusion and impact is increasing, and the probability of rail damage is also increasing. Therefore, in order to ensure the operation safety of high-speed railway and the railway, rail crack detection has become a very important thing for the railway operation Department.

Advantages of the system:

   Optical fiber is not only the transmission medium, but also the sensing element. Because of the small transmission loss of optical fiber, it can realize the measurement of dozens or even hundreds of kilometers. Because of the use of optical signal as the carrier, free from electromagnetic interference, intrinsically safe, long service life, suitable for working in harsh environment

As a sensor, optical fiber body has strong anti electromagnetic interference ability, small size, light weight, simple structure, strong multiplexing ability, long transmission distance, corrosion resistance, high sensitivity, etc.。

Technical features:

    Optical fiber real-time track breaking detection technology is a technical method to detect the stress using standard optical fiber attached to the track. By connecting one end of the optical fiber to the light source of the transmitting host, when the rail breaks or deforms, the internal waveform of the optical fiber will change accordingly, so as to judge whether the rail breaks or the rail deforms, and achieve early warning.

Performance index:

1. Working wavelength        1550nm±5nm

2、Fiber type        single mode

3、Maximum dynamic range     15dB

4、Strain distance resolution    1m

5、Ranging accuracy      ± (0.2 + 2 × sampling interval + 2 × 10-5 × distance) (m)

6、Strain test accuracy    ±0.005%(10-20ns) ±0.001%(50-200ns)

7、Repeatability of strain test   ≤±0.01%

8、Strain test range     -1.5%～+1.5%

9、Test range:         0.5、1、2、5、10、20、40、80km

10、Test pulse width         10、20、50、100、200ns

11、Average frequency range     210～224

12、Maximum sampling resolution   0.05m

13、sampling points         20000

14、Refractive index setting range   1.00000 ～ 1.99999; 0.00001 step

15、Frequency scanning interval     1、2、5、10、20、50MHz

16、Frequency scanning range     9.9GHz～12.0GHz

17、Interface             VGA, RS232C, USB, Ethernet, headset

18、Optical output interface       FC / APC (can be easily replaced with FC / SC FC / St connector)