Optical fiber sensor and sensing method based on linear filter and photoelectric detector
A technology of photoelectric detectors and optical fiber sensors, which is applied in the direction of transmitting sensing components with optical devices, can solve the problems of limiting the application range of fiber Bragg grating sensors or sensing systems, spectrometers are bulky and not so portable, and achieve enhanced portability Sexuality, cost reduction, low price effect
Inactive Publication Date: 2014-05-07
ZHEJIANG UNIV
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But this method is not so portable, because spectrometers with high wavelength resolution and insensitivity to ambient temperature and other factors are usually bulky and expensive, which also limits the use of spectrometers as analysis methods. Fiber Bragg grating sensors or The range of application of the sensing system
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Embodiment 1
[0026] Such as figure 1 As shown, this embodiment is based on a fiber Bragg grating sensor with a linear filter and a photodetector, including a broadband light source (such as a superluminescent diode broadband light source (SLED)) 1, a linear filter (Filter) 2, a fiber coupler (Coupler) ) (including 1×N fiber coupler 3 and 2×1 fiber coupler 4 ), fiber Bragg grating (FBG) 5 and photodetector (PD) 6 . Among them, the broadband light source 1 is connected to the input port of the linear filter 2 through an optical fiber; the output port of the linear filter is connected to the input port of the 1×N fiber coupler 3; the N output ports of the 1×N fiber coupler 3 are respectively connected to the photoelectric The input port of the detector 6 is connected with the input port of the 2×1 fiber coupler 4 ; the output port of the 2×1 fiber coupler 4 is connected with the fiber Bragg grating 5 .
[0027] Such as Figure 2a and Figure 2b As shown, the linear filter used in this embo...
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The invention discloses an optical fiber sensor and a sensing method based on a linear filter and a photoelectric detector. The optical fiber sensor comprises a broadband light source, the linear filter, an optical fiber Bragg grating and the photoelectric detector, wherein broadband light emitted by the broadband light source firstly enters the linear filter and is modulated by the linear filter, and an incidence light source with the light intensity changing linearly along with the wave length is output and is emitted into the position of the optical fiber Bragg grating. Parameters of the environment where the optical fiber Bragg grating is located modulate the wave length of reflection light signals, so that the wave length of the reflection light signals generates drifting relative to the intrinsic reflection wave length of the optical fiber Bragg grating. The photoelectric detector detects the light intensity of the reflection signals, further the parameters of the current environment where the optical fiber Bragg grating is located are obtained according to the linear relationship between light intensity and the wave length, and detection is finished. The optical fiber sensor and the sensing method based on the linear filter and the photoelectric detector convert wave length detection into light intensity detection, avoid using an expensive optical spectrum instrument to carry out optical fiber sensing, and effectively lower cost.
Description
technical field [0001] The invention belongs to the field of optical fiber sensing, in particular to an optical fiber sensor and a sensing method based on a linear filter and a photodetector. Background technique [0002] Fiber Bragg grating is a device that produces periodic refractive index changes in the core layer of an optical fiber to reflect specific light wavelengths (Bragg wavelengths). Since this refractive index distribution is easily changed by stress, temperature, etc., the Bragg wavelength will also change with changes in external environmental parameters. In general, the relative Bragg wavelength shift is linearly related to changes in stress or temperature. Therefore, fiber Bragg gratings can be applied to direct detection of environmental parameters such as stress and temperature. [0003] In a general fiber Bragg grating sensor or sensing system, a spectrometer is usually used to detect the wavelength of the Bragg grating reflection signal, so as to obtai...
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Inventor 何赛灵张森林周斌
Owner ZHEJIANG UNIV