Pulse delay measurement method of optical fiber sensor array based on pulse template function

Abstract

The invention discloses an optical fiber sensing array pulse time delay measurement method based on a pulse template function. Signal data are read, a first positioning pulse position is determined, a pulse cycle number is combined to divide the signal data to obtain a data matrix A, a variance value vector c is calculated and obtained, a pulse template function h is built according to pulse time parameters, a correlation value between the variance value vector c and the pulse template function h is calculated to obtain a correlation coefficient vector d, the greatest K maximum points in the d are found out to obtain a correlation coefficient vector maximum index value vector p, and the difference of the p is calculated to obtain a pulse time delay value. The method greatly improves the processing speed; the noise resisting ability is significantly enhanced; the pulse time delay value can still be accurately calculated in a condition in which normal judgment can not be carried out in other methods; parameters designated to be inputted are few, the pulse width, the rise time, the fall time and the number of sensors in the array only need to be known in advance, and the operation is thus extremely simple and reliable.

Description

technical field [0001] The invention relates to an optical fiber sensor, in particular to a pulse delay measurement method of an optical fiber sensing array based on a pulse template function. Background technique [0002] Optical fiber sensor is a new type of sensor. Because of its advantages of anti-electromagnetic interference, corrosion resistance, long transmission distance, and large-scale multiplexing, it has been widely used in underwater acoustic detection, oil field development, and large-scale structure detection. In order to further utilize the advantages of optical fiber sensors such as small size and light weight, the current mainstream application trend is to multiplex multiple optical fiber sensors with various means as much as possible to form an optical fiber sensing array or network to perceive external information, such as in The submarine array cable (OBC) formed in the field of underwater acoustic detection, and the VSP detector array used in the field ...

AI Technical Summary

Problems solved by technology

In short, the existing schemes have the following problems: low efficiency, cumbersome process; at the same time, it is easy to be interfered by noise and cause misjudgment, that is, the signal-to-noise ratio is relatively high.

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