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Distributed optical fiber temperature measuring method

A distributed optical fiber and temperature measurement technology, which is applied in the field of measurement, can solve the problems of measuring times and prolonging the measurement time, and achieve the effect of shortening the measurement time and improving the signal-to-noise ratio

Inactive Publication Date: 2008-12-31
WEIHAI BEIYANG PHOTOELECTRIC INFORMATION TECH
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Problems solved by technology

However, the increase in the number of measurements will increase the measurement time

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  • Distributed optical fiber temperature measuring method

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Embodiment Construction

[0012] The present invention is further described below:

[0013] A method for processing distributed optical fiber temperature measurement data, characterized in that in order to improve the measurement speed under the premise of ensuring the measurement accuracy, part of the previous measurement data and the data of this measurement are used in the digital average accumulation calculation, and the total accumulation calculation The amount of data remains unchanged but the measurement time can be shortened to the original (n-m) / n times. In order to achieve high-precision measurement, the system needs to accumulate and calculate a large amount of measurement data, improve the signal-to-noise ratio, and obtain the measured temperature information. In the actual measurement, the memory stores the result of each measurement. In this way, in a new measurement, in order to obtain the required measurement accuracy, it is assumed that n times of cumulative calculations (that is, n tim...

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Abstract

The invention discloses a distribution optical fiber temperature measure method (data process). Since measured signal is ultra weak submerged in noise, user needs weak signal process method to obtain the temperature information. The digit electric technique and the computer technique are the effective method for the data process of distribution optical fiber temperature measurement. And the process on the weak signal is digit accumulated average. Since the measure signal is assured and the noise is random signal, the accumulation can effectively improve signal / noise ratio. But the measure accumulation needs long measure time, and according to the character of distribution optical fiber temperature measurement, the continuous measured temperature information is correlative, and each measure data is stored. Therefore, the invention uses the last measured m measure data and local n-m data in the n measure data, to confirm the measure accuracy, and the local calculation only measures n-m times, to effectively reduce measure time.

Description

Technical field: [0001] The invention belongs to the category of measurement technology, and is a distributed optical fiber temperature measurement method. In particular, it relates to signal processing of distributed optical temperature measurement (specifically, a data processing method in distributed optical fiber temperature measurement), which can increase the calculation speed of measurement data and improve the performance of the measurement system. Background technique: [0002] We know that in the distributed optical fiber temperature measurement system, the optical fiber is used both as a transmission medium and as a sensor. Laser pulses are launched into the fiber through a bidirectional coupler and a wavelength division multiplexer. Depending on the measurement site conditions, the Raman scattered light carrying the real-time temperature information of the optical fiber will be reflected back along the optical fiber, and the scattered light will be collected by ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G08C23/06
Inventor 曹立军孙忠周
Owner WEIHAI BEIYANG PHOTOELECTRIC INFORMATION TECH