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BOTDR (Brillouin Optical Time Domain Reflectometer) for calibrating optical power of reference light and calibrating method thereof

An optical time domain reflectometry and reference light technology, applied in the field of reflectometers, can solve problems such as inability to ensure accurate measurement of strain and temperature, and a large difference in reference optical power, and achieve reduced implementation costs, low costs, and high signal-to-noise ratio. Effect

Inactive Publication Date: 2010-09-22
NANJING UNIV
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Problems solved by technology

[0006] The problem to be solved by the present invention is: in the self-heterodyne coherent detection of the existing Brillouin optical time domain reflectometer, the reference

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  • BOTDR (Brillouin Optical Time Domain Reflectometer) for calibrating optical power of reference light and calibrating method thereof
  • BOTDR (Brillouin Optical Time Domain Reflectometer) for calibrating optical power of reference light and calibrating method thereof
  • BOTDR (Brillouin Optical Time Domain Reflectometer) for calibrating optical power of reference light and calibrating method thereof

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Embodiment Construction

[0026] In order to solve the problem that the reference optical power of different frequencies produced by the electro-optical modulator has a large difference, the present invention proposes a Brillouin optical time domain reflectometer with a reference optical power calibration function, which can realize the reference optical power of different frequency points and the predetermined The error of power is smaller than the set value to ensure accurate measurement of strain and temperature.

[0027] The basic structure of BOTDR with reference optical power calibration function in the present invention is as follows figure 2 shown. The continuous light emitted by the narrow-linewidth laser is divided into two paths by the coupler, one of which is used as the probe light, which is first modulated into pulsed light by the pulse modulator, and then injected into the sensing fiber after passing through the optical amplifier. The other laser beam passes through an electro-optic modu...

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Abstract

The invention relates to a BOTDR (Brillouin Optical Time Domain Reflectometer) for calibrating optical power of reference light and a calibrating method thereof. The calibrating method comprises the following steps of: acquiring an electric signal of local reference light from a heterodyne photoreceiver on a basis of a traditional BOTDR for heterodyne coherent detection; transmitting the electric signal subjected to analog-to-digital conversion in a computer to be used as the optical power calibrating feedback quantity of the reference light; sending out an instruction by the computer to adjust the output power of a microwave source and change the optical power of the local reference light so that the difference between the optical power of the local reference light and the preset reference light power is smaller than a set value; calibrating the power; and detecting a BOTD signal. In the invention, the BOTDR in a working process can not be influenced by the working environment temperature, a microwave transmission line connecting the microwave source with an electro-optic modulator and different power responses of the electro-optic modulator on microwave signals of different frequencies, the error between the reference light power at different frequency points and the preset power is smaller than a set value, and the accurate measurement of the stress and the temperature is ensured.

Description

technical field [0001] The invention relates to a Brillouin optical time domain reflectometer for fully distributed measurement of the strain and temperature of an optical fiber, which can calibrate the optical power of reference light at different frequency points in the Brillouin optical time domain reflectometer, so as to To ensure accurate measurement of strain and temperature, it is a reference light optical power calibration method of Brillouin optical time domain reflectometer and reflectometer. Background technique [0002] Brillouin optical fiber time domain reflectometry (BOTDR) is a fully distributed optical fiber sensing system based on Brillouin scattering. The system transmits pulses from one end of the optical fiber, and at the same time detects the Brillouin scattering signal at the transmitting end. The product of the time delay between sending the pulse and receiving the scattering signal and the speed of light can provide the position information of the op...

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Application Information

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IPC IPC(8): G01B11/16G01K11/32G01K15/00G01K11/322
Inventor 路元刚王金兵李存磊张旭苹
Owner NANJING UNIV
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