Cavity length demodulation method for short-cavity optical fiber Fabry-Perot sensor
A demodulation method and sensor technology, which is applied in the direction of using optical devices to transmit sensing components, convert sensor output, instruments, etc., can solve problems such as the inability to realize cavity length calculation, increase hardware investment, realize demodulation, and reduce light source bandwidth the effect of the requirements
Active Publication Date: 2020-02-14
XIAN TECH UNIV
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Problems solved by technology
[0006] Aiming at the problem that the cavity length cannot be calculated when the spectral width of the light source is not wide enough in the prior art, the present invention proposes a cavity length demodulation method for a short-cavity optical fiber Fabry-Perot sensor
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[0084] Embodiment: In this embodiment, an ASE broadband light source is selected as the system light source. The spectral range of the light source is 1524-1570 nm, and the center wavelength is 1546 nm. Taking the optical fiber Fabry-Perot sensor with a cavity length of 15.451 μm as an example, its reflection spectrum signal can be found in image 3 .
[0085] A cavity length demodulation method for a short-cavity optical fiber Fabry-Perot sensor, the specific steps are as follows:
[0086] Step 1: Use a spectrometer to collect the reflected spectral signal of the fiber optic Fabry-Perot sensor, and transform it into the optical frequency domain v, the spectral signal is denoted as Y(v), Figure 4 (a) is the spectrogram transferred to the optical frequency domain;
[0087] Step 2: Filter out the DC amount of the optical frequency domain spectral signal, and obtain the frequency domain reflection spectral signal without DC, and the related calculation results are as follows ...
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Abstract
The invention belongs to the technical field of optical fiber sensing, and particularly relates to a cavity length demodulation method for a short-cavity optical fiber Fabry-Perot sensor. The cavity length demodulation method aims to solve the problem that when the spectrum width of a light source of the optical fiber Fabry-Perot sensor is too narrow, the short-cavity optical fiber Fabry-Perot sensor cannot be accurately demodulated. The cavity length demodulation method comprises the steps that the optical fiber Fabry-Perot sensor is irradiated by a broadband light source, the reflection spectrum of the optical fiber Fabry-Perot sensor is collected, a reflection spectrum signal is converted into an optical frequency domain from a wavelength domain, direct current is removed from the obtained optical frequency domain signal, square operation is carried out, then the peak point and the valley point of the spectrum are found through a centroid method, the spectrum period is solved, and the cavity length value of the optical fiber Fabry-Perot sensor is calculated. By means of the cavity length demodulation method, accurate demodulation of the short-cavity optical fiber Fabry-Perot sensor can be effectively achieved, and the cavity length demodulation range of the optical fiber Fabry-Perot sensor is expanded when the width of the light source is limited.
Description
technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a cavity length demodulation method for a short-cavity optical fiber Fabry-Perot sensor. Background technique [0002] Fiber optic Fabry-Perot sensors can be used to measure many different kinds of physical parameters such as pressure, strain / stress, temperature, vibration, etc. Due to its small size, light weight, high sensitivity, and anti-electromagnetic interference, fiber optic Fabry-Perot sensors have been widely used in various fields. [0003] One of the main problems for the practical application of fiber-optic Fabry-Perot sensors is the high-resolution demodulation of their cavity lengths. At present, the most typical and effective method is spectral demodulation, in which the light emitted by a broadband light source reaches the fiber optic Fabry-Perot sensor, and the reflected or transmitted spectrum is collected by an optical spectrum analy...
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IPC IPC(8): G01D5/353
CPCG01D5/35312
Inventor 陈海滨郭子龙张瑶王伟张雄星
Owner XIAN TECH UNIV