CN203785693U - Optical fiber sensor based on linear filter and photoelectric detectors - Google Patents

Optical fiber sensor based on linear filter and photoelectric detectors Download PDF

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Publication number
CN203785693U
CN203785693U CN201420054532.9U CN201420054532U CN203785693U CN 203785693 U CN203785693 U CN 203785693U CN 201420054532 U CN201420054532 U CN 201420054532U CN 203785693 U CN203785693 U CN 203785693U
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China
Prior art keywords
optical fiber
linear filter
fiber
bragg grating
fiber bragg
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Expired - Fee Related
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CN201420054532.9U
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Chinese (zh)
Inventor
何赛灵
张森林
周斌
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The utility model discloses an optical fiber sensor based on a linear filter and photoelectric detectors. The utility model comprises a broadband light source, the linear filter, optical fiber Bragg gratings, photoelectric detectors, a 1*N optical fiber coupling device and 2*1 optical fiber coupling devices. Broadband light emitted by the broadband light source is incident to the linear filter and is modulated, output of the linear filter is connected to the 1*N optical fiber coupling device and is divided into N routes in the 1*N optical fiber coupling device, output of each route is incident to an optical fiber Bragg grating through a 2*1 optical fiber coupling device, the optical fiber Bragg gratings are placed in environment to be detected, reflected signals of the optical fiber Bragg gratings enter the photoelectric detectors through the 2*1 optical fiber coupling devices, and therefore current optical fiber environmental parameters can be detected. According to the optical fiber sensor, wavelength detection is converted into light intensity detection, optical fiber sensing can be realized without using any expensive optical spectrum apparatus, and cost is effectively lowered.

Description

Based on the Fibre Optical Sensor of linear filter and photodetector
Technical field
The utility model belongs to sensory field of optic fibre, particularly a kind of Fibre Optical Sensor based on linear filter and photodetector.
Background technology
Fiber Bragg Grating FBG is in fiber core layer, to produce periodic index of refraction variation to realize the device of reflection specific wavelength of light (bragg wavelength) performance.The impact that is easy to be subject to stress, temperature etc. due to this index distribution changes, and therefore bragg wavelength also can change with the variation of external environment parameters.Usually, the variation of bragg wavelength drift and stress or temperature is linear dependence relation relatively.Therefore, Fiber Bragg Grating FBG can be applied to the direct-detection of the environmental parameter such as stress, temperature.
In general fiber Bragg grating sensor or sensor-based system, spectrometer is usually used to detect the wavelength of Bragg grating reflected signal, obtain the drift of bragg wavelength with this, and then try to achieve environmental parameter according to the linear relationship of the variation of itself and stress or temperature etc.But this means are not so portable, because wavelength resolution is higher, huger to the common volume ratio of the insensitive spectrometer of the factors such as environment temperature, and prices are rather stiff, this has also limited fiber Bragg grating sensor using spectrometer as analysis means or the range of application of sensor-based system.If the detection of wavelength can be transformed into the detection of other light signal parameters, the most common as the detection of light intensity, can directly adopt photodetector to realize Fibre Optical Sensor.
Silicon photonics is because itself and the compatibility of advanced CMOS technique, the compactedness of device, the characteristic such as manufacturing cost, superior performance of cheapness are applied to the fields such as optical interconnection, optical routing and signal processing, long haul communication, light sensing and biologic medical more and more.On the sheet of applying silicon photonics fabrication techniques, integrated passive devices obtains a wide range of applications in fields such as optical communication and light sensings as micro-ring resonator, Mach-Zehnder interferometer, direct-coupling device etc.
The devices such as the micro-ring resonator that employing silicon photonics technology realizes can obtain the filtering characteristic of approximately linear in certain wave band.Therefore can adopt integrated chip on sheet to process signal, realize wavelength and detect the equivalent relation detecting with light intensity, complete Fibre Optical Sensor.
To sum up, consider to utilize integrated linear wave filter and photodetector on sheet to realize Fibre Optical Sensor, effectively instead of optical spectrometer, for the price of reduction optical fiber Bragg grating sensing, to widen its range of application significant.
Summary of the invention
The purpose of this utility model is exactly the limitation for prior art, a kind of fiber Bragg grating sensor based on linear filter and photodetector is provided, this sensor is modulated to by incident wideband light source light intensity is linear change incoming signal with wavelength by linear filter, then detect reflected signal by photodetector, and then push away to obtain environmental parameter, compared to existing sensor, there is system architecture simply light, the advantage that equipment price is cheap.
The purpose of this utility model realizes by following technical scheme:
The utility model comprises wideband light source, linear filter, Fiber Bragg Grating FBG, photodetector, 1 × N fiber coupler and 2 × 1 fiber couplers.The broadband light that wideband light source sends is incident to linear filter and modulates, the output of linear filter is connected to 1 × N fiber coupler, in 1 × N fiber coupler, fork is divided into N road, the output on each road is all incident to Fiber Bragg Grating FBG by 2 × 1 fiber couplers, described Fiber Bragg Grating FBG is in environment to be detected, and the reflected signal of Fiber Bragg Grating FBG enters photodetector via 2 × 1 fiber couplers and realizes the detection to current optic fibre environment parameter.
Compared with prior art, tool has the following advantages and beneficial effect the utility model:
1, the utility model neutral line wave filter adopts integrated technology on sheet to realize, and with existing CMOS technical compatibility, has compact conformation, and superior performance is stable, cheap advantage.
2, the utility model detects wavelength to be converted to light intensity detection, can avoid using expensive spectral instrument to carry out Fibre Optical Sensor, effectively reduces cost, and has strengthened the portability of sensor-based system, has widened its application scenario.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model device.
Fig. 2 a is the vertical view of linear filter.
Fig. 2 b is the cut-open view of linear filter.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but embodiment of the present utility model is not limited to this.
As shown in Figure 1, the fiber Bragg grating sensor of the present embodiment based on linear filter and photodetector, comprises wideband light source (as super-radiance light emitting diode wideband light source (SLED)) 1, linear filter (Filter) 2, fiber coupler (Coupler) (comprising 1 × N fiber coupler, 3 and 2 × 1 fiber couplers 4), Fiber Bragg Grating FBG (FBG) 5 and photodetector (PD) 6.Wherein, wideband light source 1 is connected with linear filter 2 input ports by optical fiber; The output port of linear filter is connected with the input port of 1 × N fiber coupler 3; The N of 1 × N fiber coupler 3 output port is connected with the input port of 2 × 1 fiber couplers 4 together with the input port of photodetector 6 respectively; The output port of 2 × 1 fiber couplers 4 is connected with Fiber Bragg Grating FBG 5.
As shown in Figure 2 a and 2 b, the linear filter that the present embodiment uses adopts common micro-ring resonator, comprises straight wave guide 2-1, micro-ring 2-2, wherein, waveguide core layer adopts silicon materials 2-3, and upper under-clad layer adopts respectively SU8 polymkeric substance 2-4 and earth silicon material 2-5.
Described in the present embodiment, sensor adopts following method for sensing: modulate and form light intensity and be with wavelength after the incident light of linear change by the broadband light that wideband light source is sent, through after being placed in the Fiber Bragg Grating FBG reflection of environment to be measured by the light intensity of photodetector detected reflectance signal; By the wavelength of different light intensity degree and different wave length signal linear relationship acquisition one to one reflected signal; With respect to the drift of Fiber Bragg Grating FBG foveal reflex wavelength and the relation of surrounding environment parameter, obtain the parameter of surrounding environment according to the wavelength of reflected signal, realize Fibre Optical Sensor process.
Concrete, comprise the following steps:
(1) Fiber Bragg Grating FBG (FBG) 5 is placed in to environment to be detected, opens wideband light source 1;
(2) broadband light that wideband light source 1 sends is modulated into through linear filter (Filter) 2 light signal that light intensity changes with wavelength linear, then be divided into N road by 1 × N fiber coupler (Coupler) 3, Fiber Bragg Grating FBG (FBG) 5 places are incided respectively on each road;
(3) effective refractive index of Fiber Bragg Grating FBG (FBG) 5, because the impact that is subject to surrounding environment parameter changes, makes reflected signal wavelength drift about to some extent with respect to the intrinsic reflection wavelength of Fiber Bragg Grating FBG;
(4) reflected signal incides on photodetector (PD) 6 via 2 × 1 fiber couplers (Coupler) 4, detect the light intensity of reflected signal, release the wavelength of reflected signal by the light signal of different wave length and the one-to-one relationship of light intensity, the anti-release of the drift value environmental parameter to be measured with respect to Fiber Bragg Grating FBG intrinsic reflected signal wavelength according to this wavelength, realizes Fibre Optical Sensor and detects again.
In the present embodiment, wideband light source (as super-radiance light emitting diode wideband light source (SLED)) 1, photodetector (PD) 1 × N fiber coupler 3 and 2 × 1 fiber couplers 4, Fiber Bragg Grating FBG (FBG) 5 is existing matured product, and required linear filter can adopt advanced commercialization CMOS technique to make, the function of utilizing these products existing or that can realize easily to have, system described in the present embodiment building, can avoid using the spectral instrument that must adopt in traditional optical fiber sensing system, therefore greatly reduce the cost of sensor-based system, and effectively reduce the volume of system, widen its range of application, there is larger application value.
Above-described embodiment is preferably embodiment of the utility model; but embodiment of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection domain of the present utility model.

Claims (1)

1. the Fibre Optical Sensor based on linear filter and photodetector, comprises wideband light source, linear filter, Fiber Bragg Grating FBG, photodetector, 1 × N fiber coupler and 2 × 1 fiber couplers, it is characterized in that:
The broadband light that wideband light source sends is incident to linear filter and modulates, the output of linear filter is connected to 1 × N fiber coupler, in 1 × N fiber coupler, fork is divided into N road, the output on each road is all incident to Fiber Bragg Grating FBG by 2 × 1 fiber couplers, described Fiber Bragg Grating FBG is in environment to be detected, and the reflected signal of Fiber Bragg Grating FBG enters photodetector via 2 × 1 fiber couplers and realizes the detection to current optic fibre environment parameter.
CN201420054532.9U 2014-01-28 2014-01-28 Optical fiber sensor based on linear filter and photoelectric detectors Expired - Fee Related CN203785693U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103776475A (en) * 2014-01-28 2014-05-07 浙江大学 Optical fiber sensor and sensing method based on linear filter and photoelectric detector
CN104567958A (en) * 2015-01-05 2015-04-29 华中科技大学 Distributed micro-structure sensor network based on time division and wavelength division multiplexing and using method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103776475A (en) * 2014-01-28 2014-05-07 浙江大学 Optical fiber sensor and sensing method based on linear filter and photoelectric detector
CN104567958A (en) * 2015-01-05 2015-04-29 华中科技大学 Distributed micro-structure sensor network based on time division and wavelength division multiplexing and using method thereof

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Granted publication date: 20140820

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CF01 Termination of patent right due to non-payment of annual fee