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Optical fiber vibration measuring device and method for improving light source noise

A fiber optic vibration and measurement device technology, which is applied to the measurement device, uses optical devices to transmit sensing components, and measures ultrasonic/sonic/infrasonic waves. Measurement accuracy, improvement of measurement accuracy, beneficial to suppress the effect

Active Publication Date: 2020-09-18
珠海任驰光电科技有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

By calculating the spacing D AB and D CD The proportional relationship of the laser phase noise can eliminate the influence of the laser phase noise on the performance of the sensing system, compensate the measurement phase drift caused by the frequency drift in real time, and improve the measurement accuracy of the external vibration signal. However, it is a digital signal processing method, which does not fundamentally reduce the Laser phase noise makes it difficult to further improve the measurement accuracy of external vibration signals

Method used

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  • Optical fiber vibration measuring device and method for improving light source noise
  • Optical fiber vibration measuring device and method for improving light source noise
  • Optical fiber vibration measuring device and method for improving light source noise

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Embodiment 1

[0049] In a typical implementation of the present disclosure, such as Figure 1-Figure 2 As shown, a fiber optic vibration measurement device with improved light source noise is proposed.

[0050] The device includes: laser, light source noise suppression feedforward structure, coupler 3, acousto-optic modulator, erbium-doped fiber amplifier, circulator, sensing fiber, coupler 4, photodetector, data acquisition card, signal generator and processor.

[0051] The laser emits continuous light with a narrow line width, passes through the source noise suppression feed-forward structure, enters the coupler 3 with a specific power ratio, and is divided into two paths, one of which is converted into a light with acousto-optic modulation with a frequency shift function. The pulsed light with a specific width and period, after power compensation by the optical amplifier, enters the 1 port of the circulator, and then enters the sensing fiber through the 3 port of the circulator, and obt...

Embodiment 2

[0063] In another typical embodiment of the present disclosure, as Figure 1-Figure 2 As shown, a fiber vibration measurement method with improved light source noise is proposed.

[0064] Step 1, the laser outputs continuous light with a wavelength of 1550nm or 1330nm:

[0065]

[0066] Among them, A represents the light wave amplitude, v 0 Represents the light wave frequency, which is a constant of 193.5THz (corresponding to 1550nm wavelength) or 229.0THz (corresponding to 1310nm wavelength), θ(t) represents the phase noise of the light source, and t represents time.

[0067] In the second step, the continuous light of the laser is divided into two paths, one of which uses the classic Mach-Zehnder interferometer to obtain two paths (I path and Q path) orthogonal interference signals:

[0068] I(t)=Bcos(2πν 0 τ+Δθ(t)) (2)

[0069] Q(t)=Bsin(2πν 0 τ+Δθ(t)) (3)

[0070] Δθ(t)=θ(t)-θ(t-τ) (4)

[0071] Among them, B represents the amplitude of the interference signal, Δθ...

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Abstract

The invention provides an optical fiber vibration measurement device and method for improving light source noise, and relates to the field of optical fiber distributed vibration measurement. In a feed-forward loop of a light source noise suppression feed-forward structure, two paths of mutually orthogonal interference optical signals are obtained based on an optical fiber interferometer and a 90-degree optical mixer, are respectively output to a photoelectric balance detector 1 and a photoelectric balance detector 2 and are converted into two paths of interference electric signals which are output to a tracker. A light source noise suppression feed-forward structure is used for phase noise suppression of continuous light output by a laser, the light source noise suppression feed-forward structure is added to a classical 0-OTDR measuring device, laser phase noise is reduced, and the measurement precision of external vibration signals is further improved.

Description

technical field [0001] The present disclosure relates to the field of optical fiber distributed vibration measurement, in particular to an optical fiber vibration measurement device and method with improved light source noise. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Optical time domain reflectometry technology is based on the backscattering of light and Fresnel's reverse principle, using the backscattered light waves generated when pulsed light waves propagate in optical fibers to obtain information on energy (amplitude) attenuation, which can be used to measure optical fiber attenuation , connector loss, optical fiber fault point location, and understanding the loss distribution of optical fiber along the length, etc., are indispensable technologies in optical cable construction, maintenance and monitoring. [0004] With the co...

Claims

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Application Information

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IPC IPC(8): G01H9/00G01D5/353
CPCG01H9/004G01D5/35361G01D5/35329
Inventor 于淼王忠民常天英杨先勇崔洪亮杨先进郑志丰程立耀吴崇坚张耀鲁
Owner 珠海任驰光电科技有限公司
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