CN117928613A - Fiber bragg grating demodulation device and detection method based on dichroic mirror - Google Patents
Fiber bragg grating demodulation device and detection method based on dichroic mirror Download PDFInfo
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Abstract
The invention provides a fiber grating demodulation device and a detection method based on a dichroic mirror, wherein the device comprises the following components: the device comprises an ASE broadband light source, a narrowband filter, a circulator, an optical fiber Bragg grating FBG, a dichroic mirror, a circuit module and an AD sampling module. The light emitted by the ASE broadband light source is converted into narrow-band emergent light, the narrow-band emergent light is coupled into the 1 port of the circulator, the narrow-band emergent light is emitted into the fiber Bragg grating FBG from the 2 port of the circulator, the fiber Bragg grating FBG reflects a narrow-band light signal with a specific center wavelength to be incident into the 2 port of the circulator again, and the narrow-band light signal is emitted to the dichroic mirror from the 3 port of the circulator; the transmission and reflection signals of the dichroic mirror enter a circuit module, the light signal intensity is converted into a current value, and the intensity ratio of the transmission signal to the reflection signal is obtained through an I/V conversion circuit and an AD sampling circuit, so that the demodulation of the optical signal reflected by the fiber bragg grating is realized. According to the technical scheme, the detection of the wavelength of the output signal can be realized by detecting the ratio of the reflected signal to the transmitted signal.
Description
Technical Field
The invention belongs to the technical field of optical fiber wavelength demodulation quantity, and particularly relates to an optical fiber grating demodulation device and a detection method based on a dichroic mirror.
Background
The fiber bragg grating plays an important role in engineering and can be used for measuring physical quantities such as temperature, pressure, strain, deformation and the like. The optical fiber grating can also interact with the measuring object, and the change of the transmission characteristic of the light in the optical fiber grating is measured by utilizing the reflection characteristic of the optical fiber grating, so that the measuring of the measuring object is realized. The fiber bragg grating can be applied to strain measurement, temperature measurement and the like. There are many fiber grating demodulation methods, such as spectroscopic analysis, filtering, wavelength scanning, etc., but these methods basically need a plurality of devices or are not easy to operate, so that in order to be more convenient and ensure the accuracy of fiber grating demodulation, a novel fiber grating demodulation device is needed.
Therefore, how to provide a fiber grating demodulation device and a detection method based on a dichroic mirror, and to detect the wavelength of an output signal by detecting the ratio of a reflected signal to a transmitted signal, has become a technical problem to be solved.
Disclosure of Invention
The embodiment of the invention provides a fiber grating demodulation device and a detection method based on a dichroic mirror, which can realize the detection of the wavelength of an output signal by detecting the ratio of a reflected signal to a transmitted signal.
In one embodiment of the present invention, there is provided a fiber grating demodulation device based on a dichroic mirror, including: an ASE broadband light source, a narrowband filter, a circulator, a fiber Bragg grating FBG, a dichroic mirror, a circuit module and an AD sampling module.
The circulator is used for transmitting and processing bidirectional optical signals on a single optical fiber, and comprises: 1 port of the circulator, 2 ports of the circulator and 3 ports of the reverser;
the dichroic mirror is used for dividing an output signal into a transmission signal and a reflection signal;
The circuit module is used for detecting the intensity of a transmission signal and a reflection signal, and comprises: a photodiode, an I/V conversion circuit, and an amplification circuit;
The light emitted by the ASE broadband light source is incident to the narrowband filter and converted into narrowband emergent light, the narrowband emergent light is coupled into the 1 port of the circulator, is emergent from the 2 port of the circulator and enters the fiber Bragg grating FBG, and the narrowband optical signal with a specific center wavelength is reflected by the fiber Bragg grating FBG and is incident to the 2 port of the circulator again and is emergent to the dichroic mirror through the 3 port of the circulator;
The transmission and reflection signals of the dichroic mirror enter the circuit module, the light signal intensity is converted into a current value from the inside of the circuit module to the photodiode, the current value sequentially passes through the I/V conversion circuit and the AD sampling circuit, the intensity ratio of the transmission signal to the reflection signal is obtained, and the demodulation of the optical signal reflected by the fiber bragg grating is realized.
Further, the device comprises a 3dB coupler and a fiber grating demodulator;
The 3dB coupler divides the narrow-band optical signal reflected by the fiber Bragg grating FBG into two parts, one path of the narrow-band optical signal enters the fiber Bragg grating demodulator, and the other path of the narrow-band optical signal enters the dichroic mirror;
One path of the narrow bandwidth signal is detected by the fiber bragg grating demodulator, the wavelength lambda A of the narrow bandwidth signal is displayed by an upper computer, the other path of the narrow bandwidth signal passes through the dichroic mirror to form a transmission signal and a reflection signal, and the circuit module and the AD sampling module are used for detecting voltage values U T and U R of the transmission signal and the reflection signal, which are obtained by the detection module.
Further, the dichroic mirrors use different dichroic mirrors according to the required center wavelength, and the detection circuit detects the intensities of the transmission signal and the reflection signal through the transmission signal and the reflection signal of the dichroic mirrors, so as to obtain the center wavelength of the narrowband signal reflected by the optical fiber Bragg grating FBG:
Wherein λ is the wavelength of the signal, U T is the voltage value output by the detection circuit through the transmission signal, and U R is the voltage value output by the detection circuit through the reflection signal.
Further, in the circuit module, intensity values of the transmission signal and the reflection signal are detected, a signal wavelength lambda B is calculated, when lambda A＝λB is obtained, the distance from the fiber Bragg grating FBG to the circulator is changed, lambda A＝λB is always established, and the calibration of the dichroic mirror is completed.
Further, the dichroic mirror is a mirror having significantly different reflection or transmission characteristics at two different wavelengths, and the transmittance and reflectance of different dichroic mirrors for the same signal wavelength are different.
In still another embodiment of the present invention, there is provided a fiber grating demodulation detection method based on a dichroic mirror, the detection method based on any one of the above, including:
c-band broadband light signals required by an ASE broadband light source emitting device pass through a narrowband filter to enable light signals in a certain wavelength range to pass through, and then enter an optical fiber Bragg grating FBG through a circulator, wherein the optical fiber grating FBG converts the broadband light signals into narrowband light signals, and the generated narrowband light signals enter the circulator;
The circulator divides a narrow-band optical signal into a reflected signal and a transmitted signal through a dichroic mirror with calibration completed, the reflected signal and the transmitted signal enter a subsequent detection circuit module and an AD sampling module to obtain voltage values U T and U R, and the wavelength of the signal is confirmed by utilizing the relation between the intensity of the transmitted signal and the intensity of the reflected signal which are divided by the dichroic mirror by output signals with different wavelengths.
Further, the method comprises the steps of:
the 3dB coupler divides the narrow-band optical signal reflected by the fiber Bragg grating FBG into two parts, one path of the narrow-band optical signal enters the fiber Bragg grating demodulator, and the other path of the narrow-band optical signal enters the dichroic mirror;
One path of the narrow bandwidth signal is detected by the fiber bragg grating demodulator, the wavelength lambda A of the narrow bandwidth signal is displayed by an upper computer, the other path of the narrow bandwidth signal passes through the dichroic mirror to form a transmission signal and a reflection signal, and the circuit module and the AD sampling module are used for detecting voltage values U T and U R of the transmission signal and the reflection signal, which are obtained by the detection module.
Further, the method comprises the steps of:
The subsequent detection wavelength module detects the intensity values of the transmission signal and the reflection signal, the signal wavelength lambda B is obtained through calculation, and when lambda A＝λB is achieved, the distance from the fiber grating FBG 4 to the circulator 3 is changed, so that lambda A＝λB is always established, and the calibration of the dichroic mirror is completed.
The beneficial effects brought by the invention are as follows:
As can be seen from the above solution, the embodiment of the present invention provides a fiber grating demodulation device and a detection method based on a dichroic mirror, where the device includes: the device comprises an ASE broadband light source, a narrowband filter, a circulator, an optical fiber Bragg grating FBG, a dichroic mirror, a circuit module and an AD sampling module. The light emitted by the ASE broadband light source is incident into the narrow-band filter and converted into narrow-band emergent light, the narrow-band emergent light is coupled into the 1 port of the circulator, the narrow-band emergent light enters the fiber Bragg grating FBG from the 2 port of the circulator, the fiber Bragg grating FBG reflects a narrow-band light signal with a specific center wavelength and is incident into the 2 port of the circulator again, and the narrow-band light signal is emitted to the dichroic mirror from the 3 port of the circulator; the transmission and reflection signals of the dichroic mirror enter a circuit module, the light signal intensity is converted into a current value, and the intensity ratio of the transmission signal to the reflection signal is obtained through an I/V conversion circuit and an AD sampling circuit, so that the demodulation of the optical signal reflected by the fiber bragg grating is realized. According to the technical scheme, the detection of the wavelength of the output signal can be realized by detecting the ratio of the reflected signal to the transmitted signal.
Drawings
Fig. 1 shows a schematic structure of a fiber grating demodulation device based on a dichroic mirror according to an embodiment of the present invention;
FIG. 2 shows a schematic diagram of a dichroic mirror calibration of a fiber grating demodulation device based on a dichroic mirror according to an embodiment of the present invention;
FIG. 3 is a schematic diagram showing the relationship between the transmitted signal intensity and the reflected signal intensity of the output signals of different wavelengths of the fiber grating demodulation device based on the dichroic mirror according to the embodiment of the present invention;
In the figure, 1 is an ASE broadband light source, 2 is a narrowband filter, 3 is a circulator, 4 is an optical fiber Bragg grating FBG,5 is a dichroic mirror, 6 is a circuit module, 7 is an AD sampling module, 8 is a 3dB coupler, 9 is an optical fiber grating demodulator, and 10 is an upper computer.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the embodiment of the invention, in order to better detect the wavelength of an output signal, the fiber grating demodulation device based on the dichroic mirror is provided, and the dichroic mirror is adopted to detect the wavelength of the output signal by detecting the ratio of a reflected signal to a transmitted signal. The device is characterized by high accuracy, simple structure and capability of realizing detection of the wavelength of the output signal. The invention is realized by the following technical scheme.
Fig. 1 to 3 show a schematic structural diagram of a fiber grating demodulation device based on a dichroic mirror according to an embodiment of the present invention, fig. 2 shows a schematic dichroic mirror calibration diagram of a fiber grating demodulation device based on a dichroic mirror according to an embodiment of the present invention, and fig. 3 shows a schematic relation diagram of transmitted signal intensities and reflected signal intensities of output signals of different wavelengths of a fiber grating demodulation device based on a dichroic mirror according to an embodiment of the present invention, which are separated by a dichroic mirror.
In fig. 1, a fiber grating demodulation device based on a dichroic mirror includes: an ASE broadband light source 1, a narrowband filter 2, a circulator 3, a fiber bragg grating FBG4, a dichroic mirror 5, a circuit module 6 and an AD sampling module 7.
A circulator 3 for transmission and processing of bi-directional optical signals on a single optical fiber, comprising: 1 port of the circulator, 2 ports of the circulator and3 ports of the reverser;
a dichroic mirror 5 for dividing the output signal into a transmission signal and a reflection signal;
a circuit module 6 for detecting the intensity of the transmitted signal and the reflected signal, comprising: a photodiode, an I/V conversion circuit, and an amplification circuit;
The light emitted by the ASE broadband light source 1 is incident to the narrowband filter and converted into narrowband emergent light, the narrowband emergent light is coupled into the port 1 of the circulator, is emergent from the port 2 of the circulator and enters the fiber Bragg grating FBG, and the narrowband optical signal with a specific center wavelength is reflected by the fiber Bragg grating FBG and is incident to the port 2 of the circulator again, and is emergent to the dichroic mirror 5 through the port 3 of the circulator.
The transmission and reflection signals of the dichroic mirror 5 enter the circuit module, the light signal intensity is converted into a current value from the inside of the circuit module to the photodiode, the current value sequentially passes through the I/V conversion circuit and the AD sampling circuit, the intensity ratio of the transmission signal to the reflection signal is obtained, and the demodulation of the optical signal reflected by the fiber bragg grating is realized.
In the embodiment of the invention, the device comprises a 3dB coupler 8 and a fiber grating demodulator 9.
In fig. 2, the 3dB coupler 8 splits the narrowband optical signal reflected by the fiber bragg grating FBG4 into two, one of which enters the fiber grating demodulator 9 and the other enters the dichroic mirror 5.
One path of the narrow bandwidth signal is detected by the fiber bragg grating demodulator, the wavelength lambda A of the narrow bandwidth signal is displayed by an upper computer, the other path of the narrow bandwidth signal passes through the dichroic mirror to form a transmission signal and a reflection signal, and the circuit module and the AD sampling module are used for detecting voltage values U T and U R of the transmission signal and the reflection signal, which are obtained by the detection module.
In the embodiment of the invention, the dichroic mirror 5 uses different dichroic mirrors according to the required center wavelength, and the detection circuit detects the intensities of the transmission signal and the reflection signal through the transmission signal and the reflection signal of the dichroic mirror to obtain the center wavelength of the narrowband signal reflected by the optical fiber Bragg grating FBG:
Wherein λ is the wavelength of the signal, U T is the voltage value output by the detection circuit through the transmission signal, and U R is the voltage value output by the detection circuit through the reflection signal.
In the embodiment of the invention, in the circuit module 6, the intensity values of the transmission signal and the reflection signal are detected, the signal wavelength lambda B is calculated, and when lambda A＝λB is carried out, the distance from the fiber Bragg grating FBG to the circulator is changed, so that lambda A＝λB is always established, and the calibration of the dichroic mirror is completed.
Wherein the dichroic mirror is a mirror having significantly different reflection or transmission characteristics at two different wavelengths, the transmittance and reflectance of different dichroic mirrors for the same signal wavelength being different.
In the embodiment of the invention, the output signals with different wavelengths are divided into the relation diagram of the transmission signal intensity and the reflection signal intensity by the dichroic mirror. As can be seen from fig. 3, different dichroic mirrors possess different λ C, the intensity of the transmitted signal and the intensity of the reflected signal vary with the signal wavelength.
In the embodiment of the invention, a C-band broadband light signal required by an ASE broadband light source 1 emitting device passes through a narrowband filter 2 to enable a light signal with a certain wavelength range to pass through, and then enters an optical fiber Bragg grating FBG 4 through a circulator 3, the optical fiber Bragg grating FBG 4 converts the broadband light signal into a narrowband light signal, the generated narrowband light signal enters the circulator 3, the circulator 3 divides the narrowband light signal into a reflected signal and a transmitted signal through a calibrated dichroic mirror, the reflected signal and the transmitted signal enter a subsequent detection circuit module and an AD sampling module to obtain voltage values U T and U R, and the signal wavelength is confirmed by utilizing the relation between the transmitted signal intensity and the reflected signal intensity divided by the dichroic mirror by output signals with different wavelengths in FIG. 3.
The fiber grating demodulation device based on the dichroic mirror comprises an ASE broadband light source, a circulator capable of realizing bidirectional optical signal transmission on a single optical fiber, a fiber Bragg grating FBG, the dichroic mirror for dividing an output signal into a transmission signal and a reflection signal, and a detection circuit for detecting the intensities of the transmission signal and the reflection signal. The ASE broadband light source needs to pass through a narrow-band filter, so that the wavelength of an output signal can be ensured to be in a smaller range, the signal obtained by the ASE broadband light source is enabled to keep a good signal-to-noise ratio, different dichroic mirrors have different lambda C, the dichroic mirrors can use different dichroic mirrors according to the required central wavelength according to different wavelengths, the transmission signal and the reflection signal of the dichroic mirrors are detected by the detection circuit, and the central wavelength of the narrow-band signal reflected by the optical Bragg grating FBG is obtained according to a formula.
In an embodiment of the present invention, a fiber grating demodulation detection method based on a dichroic mirror, where the detection method is based on the fiber grating demodulation device based on a dichroic mirror described in any one of the above, and includes:
c-band broadband light signals required by an ASE broadband light source emitting device pass through a narrowband filter to enable light signals in a certain wavelength range to pass through, and then enter an optical fiber Bragg grating FBG through a circulator, wherein the optical fiber grating FBG converts the broadband light signals into narrowband light signals, and the generated narrowband light signals enter the circulator;
The circulator divides a narrow-band optical signal into a reflected signal and a transmitted signal through a dichroic mirror with calibration completed, the reflected signal and the transmitted signal enter a subsequent detection circuit module and an AD sampling module to obtain voltage values U T and U R, and the wavelength of the signal is confirmed by utilizing the relation between the intensity of the transmitted signal and the intensity of the reflected signal which are divided by the dichroic mirror by output signals with different wavelengths.
In an embodiment of the present invention, the method includes:
the 3dB coupler divides the narrow-band optical signal reflected by the fiber Bragg grating FBG into two parts, one path of the narrow-band optical signal enters the fiber Bragg grating demodulator, and the other path of the narrow-band optical signal enters the dichroic mirror;
One path of the narrow bandwidth signal is detected by the fiber bragg grating demodulator, the wavelength lambda A of the narrow bandwidth signal is displayed by an upper computer, the other path of the narrow bandwidth signal passes through the dichroic mirror to form a transmission signal and a reflection signal, and the circuit module and the AD sampling module are used for detecting voltage values U T and U R of the transmission signal and the reflection signal, which are obtained by the detection module.
The subsequent detection wavelength module detects the intensity values of the transmission signal and the reflection signal, the signal wavelength lambda B is obtained through calculation, and when lambda A＝λB is achieved, the distance from the fiber grating FBG 4 to the circulator 3 is changed, so that lambda A＝λB is always established, and the calibration of the dichroic mirror is completed.
In the embodiment of the invention, the output signals with different wavelengths are divided into the relation diagram of the transmission signal intensity and the reflection signal intensity by the dichroic mirror. Different dichroic mirrors possess different lambda C, the intensity of the transmitted signal and the intensity of the reflected signal varying with the wavelength of the signal.
In the embodiment of the invention, the fiber grating demodulation device based on the dichroic mirror effectively solves the problem of detecting the wavelength of the output signal, and is favorable for wide popularization.
The foregoing is a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention and are intended to be comprehended within the scope of the present invention.
Claims (8)
1. A dichroic mirror based fiber grating demodulation apparatus, comprising: an ASE broadband light source, a narrowband filter, a circulator, a fiber Bragg grating FBG, a dichroic mirror, a circuit module and an AD sampling module;
The circulator is used for transmitting and processing bidirectional optical signals on a single optical fiber, and comprises: 1 port of the circulator, 2 ports of the circulator and 3 ports of the reverser;
the dichroic mirror is used for dividing an output signal into a transmission signal and a reflection signal;
The circuit module is used for detecting the intensity of a transmission signal and a reflection signal, and comprises: a photodiode, an I/V conversion circuit, and an amplification circuit;
The light emitted by the ASE broadband light source is incident to the narrowband filter and converted into narrowband emergent light, the narrowband emergent light is coupled into the 1 port of the circulator, is emergent from the 2 port of the circulator and enters the fiber Bragg grating FBG, and the narrowband optical signal with a specific center wavelength is reflected by the fiber Bragg grating FBG and is incident to the 2 port of the circulator again and is emergent to the dichroic mirror through the 3 port of the circulator;
The transmission and reflection signals of the dichroic mirror enter the circuit module, the light signal intensity is converted into a current value from the inside of the circuit module to the photodiode, the current value sequentially passes through the I/V conversion circuit and the AD sampling circuit, the intensity ratio of the transmission signal to the reflection signal is obtained, and the demodulation of the optical signal reflected by the fiber bragg grating is realized.
2. A dichroic mirror based fiber grating demodulation apparatus according to claim 1 wherein said apparatus comprises a 3dB coupler and a fiber grating demodulator;
The 3dB coupler divides the narrow-band optical signal reflected by the fiber Bragg grating FBG into two parts, one path of the narrow-band optical signal enters the fiber Bragg grating demodulator, and the other path of the narrow-band optical signal enters the dichroic mirror;
One path of the narrow bandwidth signal is detected by the fiber bragg grating demodulator, the wavelength lambda A of the narrow bandwidth signal is displayed by an upper computer, the other path of the narrow bandwidth signal passes through the dichroic mirror to form a transmission signal and a reflection signal, and the circuit module and the AD sampling module are used for detecting voltage values U T and U R of the transmission signal and the reflection signal, which are obtained by the detection module.
3. The fiber grating demodulation device according to claim 2, wherein the dichroic mirror uses different dichroic mirrors according to a desired center wavelength, and the detection circuit detects intensities of the transmitted signal and the reflected signal through the transmitted signal and the reflected signal of the dichroic mirror, so as to obtain a center wavelength of a narrowband signal reflected by the fiber bragg grating FBG:
Wherein λ is the wavelength of the signal, U T is the voltage value output by the detection circuit through the transmission signal, and U R is the voltage value output by the detection circuit through the reflection signal.
4. The device according to claim 2, wherein in the circuit module, intensity values of the transmission signal and the reflection signal are detected, a signal wavelength λ B is calculated, and when λ A＝λB is calculated, a distance from the fiber bragg grating FBG to the circulator is changed, so that λ A＝λB is always established, and the calibration of the dichroic mirror is completed.
5. The dichroic mirror of claim 1, wherein the dichroic mirror is a mirror having significantly different reflection or transmission characteristics at two different wavelengths, the transmittance and reflectance of different dichroic mirrors for the same signal wavelength being different.
6. A fiber grating demodulation detection method based on a dichroic mirror, wherein the detection method is based on a fiber grating demodulation device based on a dichroic mirror according to any one of claims 1 to 5, comprising:
c-band broadband light signals required by an ASE broadband light source emitting device pass through a narrowband filter to enable light signals in a certain wavelength range to pass through, and then enter an optical fiber Bragg grating FBG through a circulator, wherein the optical fiber grating FBG converts the broadband light signals into narrowband light signals, and the generated narrowband light signals enter the circulator;
The circulator divides a narrow-band optical signal into a reflected signal and a transmitted signal through a dichroic mirror with calibration completed, the reflected signal and the transmitted signal enter a subsequent detection circuit module and an AD sampling module to obtain voltage values U T and U R, and the wavelength of the signal is confirmed by utilizing the relation between the intensity of the transmitted signal and the intensity of the reflected signal which are divided by the dichroic mirror by output signals with different wavelengths.
7. The dichroic mirror based fiber grating demodulation detection method as recited in claim 6, wherein the method comprises:
the 3dB coupler divides the narrow-band optical signal reflected by the fiber Bragg grating FBG into two parts, one path of the narrow-band optical signal enters the fiber Bragg grating demodulator, and the other path of the narrow-band optical signal enters the dichroic mirror;
One path of the narrow bandwidth signal is detected by the fiber bragg grating demodulator, the wavelength lambda A of the narrow bandwidth signal is displayed by an upper computer, the other path of the narrow bandwidth signal passes through the dichroic mirror to form a transmission signal and a reflection signal, and the circuit module and the AD sampling module are used for detecting voltage values U T and U R of the transmission signal and the reflection signal, which are obtained by the detection module.
8. The dichroic mirror based fiber grating demodulation detection method as recited in claim 7, wherein the method comprises:
The subsequent detection wavelength module detects the intensity values of the transmission signal and the reflection signal, the signal wavelength lambda B is obtained through calculation, and when lambda A＝λB is achieved, the distance from the fiber grating FBG 4 to the circulator 3 is changed, so that lambda A＝λB is always established, and the calibration of the dichroic mirror is completed.
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