Fiber Bragg Grating Dynamic Strain Demodulator and Method Based on Random Unequal Sampling

Abstract

The invention relates to the demodulation technology of fiber gratings, in particular to a demodulation instrument and a demodulation method of fiber grating dynamic strain based on random unequal interval sampling. The demodulation instrument and the demodulation method of the fiber grating dynamic strain based on the random unequal interval sampling solve the problem that an existing demodulation technology of the fiber gratings is low in demodulation speed, low in demodulation precision, inconvenient to use, high in using cost, and narrow in an application range. The demodulation instrument of the fiber grating dynamic strain based on the random unequal interval sampling comprises a broadband light source, a tunable filter, an optical fiber coupler, an isolator, a fiber grating, an etalon, a first photoelectric detector, a second photoelectric detector, a first signal amplification conditioning circuit, a second signal amplification conditioning circuit, a multi-path synchronization analog-to-digital (A / D) converter, a demodulation control circuit based on a field programmable gate array (FPGA), a computer, a digital-to-analog (D / A) converter, and a high voltage drive amplification circuit. The demodulation instrument and the demodulation method of the fiber grating dynamic strain based on the random unequal interval sampling are applicable for fiber grating sensors.

Description

technical field [0001] The invention relates to a fiber grating demodulation technology, in particular to a fiber grating dynamic strain demodulator and method based on random non-equal interval sampling. Background technique [0002] Fiber gratings can convert external strain signals (such as stress signals, strain signals, vibration signals, temperature change signals, etc.) into central wavelength change signals of their reflection spectrum. Therefore, by properly packaging the fiber grating, a fiber grating sensor can be made. Fiber Bragg grating sensors are widely used in the fields of long-distance optical sensing and optical communication due to their characteristics of being free from electromagnetic radiation interference, small size, simple fabrication, and wavelength sensitivity. In practical applications, in order to ensure that the fiber grating sensor can work normally, it is necessary to demodulate the fiber grating. At present, the fiber grating demodulatio...

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Problems solved by technology

[0003] In order to solve the problems of low demodulation speed, low demodulation accuracy, inconvenient use, high use cost and narrow application range of the existing fiber grating demodulation technology, the present invention provides a fiber grating based on random non-equally spaced sampling Dynamic strain interrogator and method

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