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Device for measuring active photonic crystal fiber pressure

A technology of photonic crystal fiber and measuring device, which is applied in the direction of measuring force by measuring the change of optical properties of materials when they are stressed, can solve the problems of low sensitivity and unstable slope factor, and achieve good beam quality and weight. Light, stable and reliable results

Inactive Publication Date: 2012-02-15
TIANJIN UNIV
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Problems solved by technology

[0003] However, the existing technology generally has shortcomings such as low sensitivity and unstable slope factor.

Method used

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  • Device for measuring active photonic crystal fiber pressure
  • Device for measuring active photonic crystal fiber pressure

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Embodiment Construction

[0016] In the present invention, the sensing region is the fiber laser cavity itself, the fiber cladding is made of special materials, and two transverse stress regions are added to generate birefringence. Due to the elasto-optic effect, the external pressure acting on the cavity will change the birefringence of the fiber , the polarization state of the output light changes. The two polarization modes result in different effective indices of refraction. The sensitivity of the sensor depends on the birefringence of the fiber and the output bandwidth of the laser.

[0017] The pressure sensor based on the laser cavity is suitable for occasions where the birefringence of the fiber is changed due to external interference. It can measure changes in various physical quantities. This type of sensor has many advantages: small fluctuations in light intensity, high sensitivity, and stable slope factor.

[0018] In order to overcome the deficiencies of the prior art, the object of the ...

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Abstract

The invention relates to fiber sensing pressure measuring. In order to provide a fiber pressure sensor with little light intensity fluctuation, high sensitivity and stable slope factor, the invention adopts the technical scheme that: the invention discloses a device for measuring active photonic crystal fiber pressure; and the device comprises a semiconductor laser, a fiber-coupling lens group, a polarizer, a fiber resonant cavity of the semiconductor laser and Yb-doped and polarization-maintaining photonic crystal fiber, wherein the semiconductor laser is used for generating lasers; the fiber-coupling lens group and the polarizer are used for converting the lasers in the semiconductor laser into polarized light and coupling the polarized light into Yb-doped photonic crystal polarization-maintaining fiber; a dichroic mirror is tightly close to a pumping end face of the Yb-doped and polarization-maintaining photonic crystal fiber so as to serve as a front cavity mirror, and the cross-section of the vertically-cut Yb-doped and polarization-maintaining photonic crystal fiber forms 4% of a Fresnel reflection structure so as to form a rear cavity mirror; and the output of the rear cavity mirror is loaded to a power meter through a polarization analyzer. The device for measuring the active photonic crystal fiber pressure is mainly applied to pressure detection.

Description

technical field [0001] The invention relates to pressure measurement, in particular to realizing pressure measurement by intensity modulation of an active optical fiber, that is, an active photonic crystal fiber pressure measurement device, and in particular to an active photonic crystal fiber pressure measurement device. Background technique [0002] In the photonic crystal fiber laser, the photons oscillate back and forth in the resonator, which increases the interaction time and length of the light and the substance to be detected. Compared with the general broadband light source, it improves the signal-to-noise ratio and optical power of the sensing wavelength, so it can Detects small changes in the optical properties of the sample material with higher sensitivity. This special sensing and detection technology built in the laser cavity can be applied in a large number of unconventional sensing and detection fields, especially in the fields of biology and chemistry. [0...

Claims

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Application Information

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IPC IPC(8): G01L1/24
Inventor 陆颖王若琪周睿黄晓慧姚建铨
Owner TIANJIN UNIV
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