CN203037273U - An AWG-based demodulating device of an optical fiber grating sensor - Google Patents
An AWG-based demodulating device of an optical fiber grating sensor Download PDFInfo
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- CN203037273U CN203037273U CN 201320069798 CN201320069798U CN203037273U CN 203037273 U CN203037273 U CN 203037273U CN 201320069798 CN201320069798 CN 201320069798 CN 201320069798 U CN201320069798 U CN 201320069798U CN 203037273 U CN203037273 U CN 203037273U
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Abstract
The utility model discloses an AWG-based demodulating device of an optical fiber grating sensor and belongs to the technical field of acoustic emission testing. The purpose of the utility model is to resolve a problem that a sensing wavelength range is inversely proportional to demodulating speed in a conventional optical fiber grating sensing signal demodulating mode. 1*N splitters divide a ray of light outputted from a ASE light source into N same optical signals and respectively transmit the N same optical signals to N AWGs. The optical signal input and output end of each AWG transmits the optical signal to an optical fiber grating probe and a narrow-band optical signal reflected by the optical fiber grating probe is fed back to the optical signal input and output end of the AWG. According to the wavelength range of the narrow-band optical signal, the AWG selects a corresponding channel to output the narrow-band optical signal to a PIN photoelectric converter. An electric signal converted by the PIN photoelectric converter is outputted to a signal amplifying and A/D converting module which outputs a digital signal to a FPGA processing circuit. The demodulating device is mainly used for demodulating the optical fiber grating sensor in the field of acoustic emission testing.
Description
Technical field
Demodulating equipment based on the fiber-optic grating sensor of AWG (Arrayed Waveguide Grating) belongs to the acoustic emission testing technology field, is applied in the acoustic emission fields of measurement demodulation to fiber-optic grating sensor.
Background technology
Acoustic emission is a kind of advanced person's Dynamic Non-Destruction Measurement, it knows information such as measured object internal injury, fracture, distortion by the sound wave of surveying and analysis measured object self sends, and this technology is in field extensive application such as oil, chemical industry, electric power, Aero-Space, metal processing, water conservancy and hydropowers.The key element of acoustic emission is the calibrate AE sensor that sound wave is gathered and surveyed.
In many special occasions, the calibrate AE sensor that utilizes fiber grating to make has the advantages that many traditional sensors do not possess.Fiber grating has that volume is little, in light weight, corrosion-resistant, anti-electromagnetic interference capability is strong, easy of integration, advantages of simple structure and simple, can bury to overlay on testee and material internal the acoustic emission signal of various damages is detected.
Traditional optical fiber grating sensing signal demodulation mode mostly is length scanning type or color filter intensity detection type, and the former sensing wavelength scope is big, can reach 80nm, but demodulation speed is low, and it is up to several KHz; Latter's demodulation speed is fast, can reach the 10M hertz, but the sensing wavelength narrow range generally has only 2～3nm; Sensing wavelength scope in above-mentioned two kinds of demodulation modes and demodulation speed can not reach best demodulation effect simultaneously, and sensing wavelength scope and demodulation speed all are inversely proportional to.
The utility model content
The purpose of this utility model is in order to solve the problem that the sensing wavelength scope that exists in the existing traditional optical fiber grating sensing signal demodulation mode and demodulation speed are inversely proportional to, and the utility model provides a kind of demodulating equipment of the fiber-optic grating sensor based on AWG.
Based on the demodulating equipment of the fiber-optic grating sensor of AWG, it comprises that ASE (amplified spontaneous emission) light source, 1 * N shunt, a N AWG, a N fiber grating probe, PIN (positive intrinsic negative) photovoltaic converter, signal amplify and A/D (analog/digital) modular converter and FPGA (Field programmable gate array) treatment circuit; The light signal output end of described ASE light source is connected with the light signal input end of 1 * N shunt, and the N of described a 1 * N shunt light signal output end is connected with the light signal input end of N AWG respectively; The input/output terminal of the light signal of a described N AWG is connected with the input/output terminal of the light signal of N fiber grating probe respectively, and wherein N is the positive integer greater than 1;
AWG has 4 narrowband optical signal output terminals, 4 narrowband optical signal output terminals of each AWG are connected with the light signal input end of PIN photovoltaic converter respectively, and the electrical signal of described PIN photovoltaic converter amplifies with signal respectively and the input end of analog signal of A/D modular converter is connected; Described signal amplifies and the digital signal output end of A/D modular converter is connected with the detection signal input end of FPGA treatment circuit.
The light signal of the N of described 1 * N shunt light signal output end output is identical.
The reference optical power of the light signal of described ASE light source output is between 100mW～500mW, and the spectrum width scope of described light signal is between 40nm～50nm.
The A/D sampling rate of described signal amplification and A/D modular converter is greater than 10MHz, and sampling precision is 16.
It is that 3dB, bandwidth are the single-mode fiber grating of 0.6nm that described fiber grating probe adopts light signal strength.
Described N is the positive integer more than or equal to 3.
The beneficial effect that the utility model brings is: the sensing wavelength wide ranges, and demodulation speed can reach 10MHz when can reach 1525nm～1565nm, and sensitivity is strong, and sensitivity can reach 2 μ ε by force.
Description of drawings
Fig. 1 is the principle schematic of the demodulating equipment of the fiber-optic grating sensor based on AWG described in the utility model;
Fig. 2 is the transmitted light spectrogram of AWG described in the utility model; The curve of spectrum of the light signal of 4 narrowband optical signal output terminals outputs of curve ch1, curve ch2, curve ch3 and curve ch4 difference corresponding A WG among the figure.
Embodiment
Embodiment one: present embodiment is described referring to Fig. 1, the demodulating equipment of the described fiber-optic grating sensor based on AWG of present embodiment, it comprises that ASE light source 1,1 * N shunt 2, a N AWG3, a N fiber grating probe 4, PIN photovoltaic converter 5, signal amplify and A/D modular converter 6 and FPGA treatment circuit 7; The light signal output end of described ASE light source 1 is connected with the light signal input end of 1 * N shunt 2, and the N of described 1 * N shunt 2 light signal output end is connected with the light signal input end of N AWG3 respectively; The input/output terminal of the light signal of a described N AWG3 is connected with the input/output terminal of the light signal of N fiber grating probe 4 respectively, and wherein N is the positive integer greater than 1;
AWG3 has 4 narrowband optical signal output terminals, 4 narrowband optical signal output terminals of each AWG3 are connected with the light signal input end of PIN photovoltaic converter 5 respectively, and the electrical signal of described PIN photovoltaic converter 5 amplifies with signal respectively and the input end of analog signal of A/D modular converter 6 is connected; Described signal amplifies and the digital signal output end of A/D modular converter 6 is connected with the detection signal input end of FPGA treatment circuit 7.
Embodiment two: referring to Fig. 1 present embodiment is described, the difference of present embodiment and embodiment one is that the light signal of the N of described 1 * N shunt 2 light signal output end output is identical.
Embodiment three: present embodiment is described referring to Fig. 1, the difference of present embodiment and embodiment one is, the reference optical power of the light signal of described ASE light source 1 output is between 100mW～500mW, and the spectrum width scope of described light signal is between 40nm～50nm.
Embodiment four: referring to Fig. 1 present embodiment is described, the difference of present embodiment and embodiment one is that the A/D sampling rate of described signal amplification and A/D modular converter 6 is greater than 10MHz, and sampling precision is 16.
Embodiment five: referring to Fig. 1 present embodiment is described, the difference of present embodiment and embodiment one is that it is that 3dB, bandwidth are the single-mode fiber grating of 0.6nm that described fiber grating probe 4 adopts light signal strength.
Embodiment six: referring to Fig. 1 present embodiment is described, the difference of present embodiment and embodiment one is that described N is the positive integer more than or equal to 3.
Principle analysis based on the demodulating equipment of the fiber-optic grating sensor of AWG is as follows:
The light signal output end of ASE light source 1 is connected with the light signal input end of 1 * N shunt 2, and the N of described 1 * N shunt 2 light signal output end is connected with the light signal input end of N AWG3 respectively; The input/output terminal of the light signal of a described N AWG3 is connected with the input/output terminal of the light signal of N fiber grating probe 4 respectively, fiber grating probe 4 is placed in the environment to be measured, when change to be measured, the optical wavelength variable signal that fiber grating probe 4 can will be loaded with the measured physical quantity change information reflects by original optical path, the optical wavelength variable signal that reflects is behind AWG3, the passage of corresponding its wavelength has light signal output (referring to Fig. 2), with this light signal through PIN photovoltaic converter 5, after the conversion of signal amplification and A/D modular converter 6, entering FPGA treatment circuit 7 handles, calculate its wavelength of optical signal variable quantity, according to calibration value the wavelength of optical signal variable quantity is converted to actual physical amount variable quantity again.The utility model does not have moving-member, and its anti-electromagnetic interference capability is strong, is better than national electromagnetic compatibility radio frequency electromagnetic field radiation and tests 3 grade standards---30V/m; The reliability height, demodulation speed is fast, and it is wide to measure wavelength coverage.
Claims (6)
1. based on the demodulating equipment of the fiber-optic grating sensor of AWG, it is characterized in that it comprises that ASE light source (1), 1 * N shunt (2), a N AWG (3), N fiber grating probe (4), PIN photovoltaic converter (5), signal amplify and A/D modular converter (6) and FPGA treatment circuit (7); The light signal output end of described ASE light source (1) is connected with the light signal input end of 1 * N shunt (2), and N light signal output end of described 1 * N shunt (2) is connected with the light signal input end of N AWG (3) respectively; The input/output terminal of the light signal of a described N AWG (3) is connected with the input/output terminal of the light signal of N fiber grating probe (4) respectively, and wherein N is the positive integer greater than 1;
AWG (3) has 4 narrowband optical signal output terminals, 4 narrowband optical signal output terminals of each AWG (3) are connected with the light signal input end of PIN photovoltaic converter (5) respectively, and the electrical signal of described PIN photovoltaic converter (5) amplifies with signal respectively and the input end of analog signal of A/D modular converter (6) is connected; Described signal amplifies and the digital signal output end of A/D modular converter (6) is connected with the detection signal input end of FPGA treatment circuit (7).
2. the demodulating equipment of the fiber-optic grating sensor based on AWG according to claim 1 is characterized in that, the light signal of N light signal output end output of described 1 * N shunt (2) is identical.
3. the demodulating equipment of the fiber-optic grating sensor based on AWG according to claim 1, it is characterized in that, the reference optical power of the light signal of described ASE light source (1) output is between 100mW～500mW, and the spectrum width scope of described light signal is between 40nm～50nm.
4. the demodulating equipment of the fiber-optic grating sensor based on AWG according to claim 1 is characterized in that, described signal amplify and the A/D sampling rate of A/D modular converter (6) greater than 10MHz, sampling precision is 16.
5. the demodulating equipment of the fiber-optic grating sensor based on AWG according to claim 1 is characterized in that, it is that 3dB, bandwidth are the single-mode fiber grating of 0.6nm that described fiber grating probe (4) adopts light signal strength.
6. the demodulating equipment of the fiber-optic grating sensor based on AWG according to claim 1 is characterized in that described N is the positive integer more than or equal to 3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320069798 CN203037273U (en) | 2013-02-06 | 2013-02-06 | An AWG-based demodulating device of an optical fiber grating sensor |
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| CN 201320069798 CN203037273U (en) | 2013-02-06 | 2013-02-06 | An AWG-based demodulating device of an optical fiber grating sensor |
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| CN 201320069798 Expired - Fee Related CN203037273U (en) | 2013-02-06 | 2013-02-06 | An AWG-based demodulating device of an optical fiber grating sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103148879A (en) * | 2013-02-06 | 2013-06-12 | 黑龙江大学 | Arrayed waveguide grating (AWG)-based fiber grating sensor demodulating device |
| CN115629133A (en) * | 2022-08-19 | 2023-01-20 | 绍兴市上虞区武汉理工大学高等研究院 | Nuclear power equipment damage detection system based on fiber bragg grating acoustic emission sensor |
-
2013
- 2013-02-06 CN CN 201320069798 patent/CN203037273U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103148879A (en) * | 2013-02-06 | 2013-06-12 | 黑龙江大学 | Arrayed waveguide grating (AWG)-based fiber grating sensor demodulating device |
| CN115629133A (en) * | 2022-08-19 | 2023-01-20 | 绍兴市上虞区武汉理工大学高等研究院 | Nuclear power equipment damage detection system based on fiber bragg grating acoustic emission sensor |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130703 Termination date: 20220206 |