Phase-shift pulse generation device for time division multiplexing FBG sensor network

Abstract

The invention discloses a phase-shift pulse generation device for a time division multiplexing FBG sensor network. The device is characterized in that an FBG on the sensor network is elected through a high-precision phase-shift electric pulse signal controlling an optical signal so as to finish the time division multiplexing of large-scale optical fibers. The device comprises a configuration information analyzing unit, a pulse width information unit, a pulse width cycle information unit, a first-stage time delay control unit, a second-stage time delay control unit, a pulse control unit, a FBG position information storing control unit and an OSERDES parallel-serial conversion unit which are connected through electric signals. According to the pulse-shift pulse generation device and method, the problem that the FBG cannot be automatically scanned through a commercial signal generator can be solved; in addition, the pulse phase shift precision can be greatly improved; the cost is low; the integrity is high; the system structure is simple; the reliability is high; the time division multi-way FBG array expansion can be carried out conveniently.

Description

technical field [0001] The invention relates to the field of fiber grating sensor networks, in particular to a phase-shift pulse generation method for a time-division multiplexing FBG sensor network, which can realize time-division multiplexing FBG detection or control of optical switch electrical signals of a modulation and demodulation system. Background technique [0002] The advantages of weak fiber grating sensor networks are small crosstalk, strong multiplexing capability and high cost performance. It is expected to realize quasi-distributed detection in harsh environments such as oil fields, tunnels, and building health monitoring. At present, the "on-line grating writing" technology can automatically write the grating array at a certain distance during the fiber drawing process. This technology not only avoids the contact loss when the traditional grating is welded into an array, but also improves the spatial distribution density of the grating and the capacity of th...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: aiming at the problem that the target optical pulse control signal cannot be automatically generated online in the existing time-division multiplexing FBG sensor network system, a phase-shift pulse of the time-division m

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