Accompany with the changed outside pressure, the Bragg center reflective
wavelength of OFG changed correspondingly. According to the
characteristic, a new kind of optical fiber grating pressure sensor
combined with computer monitor is designed. The measure time of it is
1ms/point, it can be widely used for train real-time tracing, the
parameters of train can be given, such as position, length, ... [Show full abstract] velocity,
acceleration, disjoint and so on.