A power compensating multi-point wind speed detection device and method

Abstract

The application provides a power compensation multi-point wind speed detection device, which comprises a pumping light source, a hot-wire optical fiber and a doped optical fiber amplifier connected in sequence and alternately with the pumping light source; an optical fiber grating is arranged around the hot-wire optical fiber, the optical fiber grating is connected with the middle end of an optical fiber circulator, and the output end of the optical fiber circulator is connected with a spectrum analyzer. The doped optical fiber amplifier is used for compensating the light attenuation caused by the hot-wire optical fiber, so that the single light source can be used for high-precision simultaneous detection of multi-point wind speed.

Description

Technical Field

[0001] This invention belongs to the technical field of wind speed detection, and in particular relates to a power-compensated multi-point wind speed detection device and method. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Wind speed is a concept used to measure the velocity of gas flow. In meteorology, wind speed sensors collect information to predict recent weather conditions. In industry, accurate wind speed monitoring is of paramount importance for transportation, the design of building height and shape, and military applications. In coal mining, wind speed is one of the most crucial parameters in mine ventilation systems. Real-time, accurate wind speed data helps to precisely control mine airflow, effectively reducing temperature, dispersing harmful gases, and preventing and extinguishing fires, thus ensuring safe underground production. Therefore, wind speed detection is a prerequisite for underground coal mining operations.

[0004] Currently, the most commonly used wind speed sensors on the market include ultrasonic vortex anemometers, Doppler velocimeters, ultrasonic anemometers, impeller anemometers, mechanical anemometers, and differential pressure anemometers. Most wind speed sensors cannot measure in harsh environments, cannot shield against electromagnetic interference, have low accuracy, are bulky, and are not easily portable, thus having many limitations in measurement. Furthermore, they cannot achieve multi-point wind speed detection using a single source. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a power-compensated multi-point wind speed detection device and method, which realizes simultaneous multi-point detection of wind speed using a single light source, and has the advantages of high power and high accuracy.

[0006] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions: The first aspect of the present invention provides a power-compensated multi-point wind speed detection device, comprising: a pump light source, a hot-wire optical fiber and a doped optical fiber amplifier connected alternately to the pump light source in sequence; a fiber grating is placed around the hot-wire optical fiber, the fiber grating is connected to the middle end of an optical fiber circulator, and the output end of the optical fiber circulator is connected to a spectrometer.

[0007] A second aspect of the present invention provides a power-compensated multi-point wind speed detection method, employing a power-compensated multi-point wind speed detection device as described above, comprising:

[0008] Turn on the power of the wind speed detection device and use a spectrum analyzer to detect the wavelength of the corresponding fiber optic grating at this time;

[0009] The wind tunnel was opened to change the temperature around the hot-wire fiber, and the wavelength of the corresponding fiber grating was detected using a spectrometer.

[0010] By comparing the wavelength changes before and after the fiber grating, the wind tunnel wind speed can be obtained through inversion.

[0011] The above one or more technical solutions have the following beneficial effects:

[0012] In this invention, a hot-wire fiber and a doped fiber amplifier are sequentially and alternately connected to a pump light source. Different wind tunnel wind speeds cause different wavelength shifts in the fiber gratings corresponding to the hot-wire fiber due to changes in the temperature around the hot-wire fiber. The doped fiber amplifier is used to compensate for the optical attenuation caused by the hot-wire fiber. By detecting the change in the wavelength of the fiber grating, the wind speed at different wind tunnels can be inverted, thus achieving high-precision simultaneous detection of wind speeds at multiple points using a single light source.

[0013] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0015] Figure 1 This is a schematic diagram of the power-compensated multi-point wind speed detection device in Embodiment 1 of the present invention;

[0016] Figure 2 These are the wavelengths on the 6.0 spectrometer corresponding to different wind speeds in Embodiment 2 of the present invention;

[0017] Figure 3 These are the wavelengths on the spectral analyzer 6.1 corresponding to different wind speeds in Embodiment 2 of the present invention;

[0018] Figure 4 These are the wavelengths on the 6.n spectrometer corresponding to different wind speeds in Embodiment 2 of the present invention;

[0019] 1. Pump light source; 2.0. Hot-wire fiber; 2.1. First hot-wire fiber; 2.n. Nth hot-wire fiber; 3.0. Fiber Bragg grating; 3.1. First fiber Bragg grating; 3.n. Nth fiber Bragg grating; 4.0. Broadband light source; 4.1. First broadband light source 1; 4.n. Nth broadband light source; 5.0. Fiber circulator; 5.1. First fiber circulator 1; 5.n. Nth fiber circulator; 6.0. Spectrometer; 6.1. First spectrometer; 6.n. Nth spectrometer; 7.1. First doped fiber amplifier; 7.n. Nth doped fiber amplifier; 8.0. Wind tunnel; 8.1. First wind tunnel; 8.n. Nth wind tunnel. Detailed Implementation

[0020] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations of the present invention.

[0022] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0023] Example 1

[0024] like Figure 1 As shown, this embodiment discloses a power-compensated multi-point wind speed detection device, including: a pump light source, a hot-wire optical fiber and a doped optical fiber amplifier connected alternately to the pump light source in sequence; a fiber grating is placed around the hot-wire optical fiber, the fiber grating is connected to the middle end of an optical fiber circulator, and the output end of the optical fiber circulator is connected to a spectrometer.

[0025] In this embodiment, a power-compensated multi-point wind speed detection device includes a pump light source 1, a hot-wire optical fiber 2.0 connected to the pump light source 1, a first doped fiber amplifier 7.1 connected to the hot-wire optical fiber 2.0, a first hot-wire optical fiber 2.1 connected to the first doped fiber amplifier 7.1, and so on, with an nth hot-wire optical fiber 2.n connected to the nth doped fiber amplifier 7.n.

[0026] In this embodiment, a fiber grating 3.0 is placed around the hot-wire fiber 2.0, and a first fiber grating 3.1 is placed around the first hot-wire fiber 2.1. Similarly, an nth fiber grating 3.n is placed around the nth hot-wire fiber 2.n.

[0027] In this embodiment, the fiber optic grating 3.0 is connected to the middle end of the fiber optic circulator 5.0, the input end of the fiber optic circulator 5.0 is connected to the broadband light source 4.0, and the output end of the fiber optic circulator 5.0 is connected to the spectrometer 6.0.

[0028] A fiber grating 3.0 is placed around the hot-wire fiber 2.0, and a fiber grating 3.1 is placed around the first hot-wire fiber 2.1. Similarly, a fiber grating 3.n is placed around the nth hot-wire fiber 2.n.

[0029] The first fiber grating 3.1 is connected to the middle end of the first fiber optic circulator 5.1, the input end of the first fiber optic circulator 5.1 is connected to the first broadband light source 4.1, and the output end of the first fiber optic circulator 5.1 is connected to the first spectrometer 6.1.

[0030] Similarly, the nth fiber grating 3.n is connected to the middle end of the nth fiber circulator 5.n, the input end of the nth fiber circulator 5.n is connected to the nth broadband light source 4.n, and the output end of the nth fiber circulator 5.n is connected to the nth spectrometer 6.n.

[0031] In this embodiment, wind tunnel 8.0 is located above hot-wire fiber 2.0, and the first wind tunnel 8.1 is located above the first hot-wire fiber 2.1. Similarly, the nth wind tunnel 8.n is located above the nth hot-wire fiber 2.n.

[0032] In this embodiment, the pump light source 1 is a semiconductor laser with a center wavelength of 1550nm.

[0033] In this embodiment, the hot-wire optical fiber is a high-loss cobalt-doped optical fiber, and the coating layer has been removed.

[0034] In this embodiment, the doped fiber amplifier is an erbium-doped fiber amplifier, and the wavelength amplification range of the doped fiber amplifier includes the output wavelength of the pump light source.

[0035] Example 2

[0036] This embodiment proposes a power-compensated multi-point wind speed detection method, employing a power-compensated multi-point wind speed detection device proposed in Embodiment 1, comprising:

[0037] Turn on the power of the wind speed detection device and use a spectrum analyzer to detect the wavelength of the corresponding fiber optic grating at this time;

[0038] The wind tunnel was opened to change the temperature around the hot-wire fiber, and the wavelength of the corresponding fiber grating was detected using a spectrometer.

[0039] By comparing the wavelength changes before and after the fiber grating, the wind tunnel wind speed can be obtained through inversion.

[0040] In this embodiment, a power-compensated multi-point wind speed detection device is connected, and the power supplies to each component of the device are turned on. Light emitted from the pump source is incident on a hot-wire optical fiber. Due to the inherent thermal effect of the hot-wire fiber, the light energy is converted into heat energy, causing a change in the surrounding temperature. This temperature change causes a shift in the center wavelength of the fiber optic grating, and the wavelength displayed by the spectrometer at this time is recorded. The hot-wire fiber is connected to a doped fiber amplifier to compensate for the light loss caused by the hot-wire fiber. The compensated light then enters the next segment of the hot-wire fiber to monitor the wind speed at the next point. This process continues until the Nth point, recording the wavelengths of the N spectrometers sequentially. Then, the wind tunnel is opened, and the airflow carries away the heat around the hot-wire fiber, causing a temperature drop and a wavelength shift in the fiber Bragg grating. Different wind speeds carry away different amounts of heat, resulting in different wavelength shifts. The wavelength displayed on the spectrometer at this time is recorded. Similarly, the N wind tunnels are opened sequentially, and the corresponding wavelengths on the spectrometers are recorded. The wavelength shifts on the N spectrometers are compared when the N wind tunnels are open and closed to deduce the wind speed at different points. After signal processing, the power is turned off.

[0041] When used in wind speed detection devices, hot-wire optical fiber is a high-loss optical fiber. Doped fiber amplifiers can be used to compensate for the light attenuation caused by the loss of hot-wire optical fiber. Since the light intensity is proportional to the wind speed, a single light source can be used to detect the wind speed at multiple points simultaneously with high precision.

[0042] For example, the output wavelength range of broadband light source 4.0 is 1532nm-1572nm, and the center wavelength of fiber optic grating 3.0 is 1549.8nm; the output wavelength range of broadband light source 4.1 is 1530nm-1575nm, and the center wavelength of fiber optic grating 3.1 is 1549.3nm; ..., the output wavelength range of broadband light source 4.n is 1530nm-1570nm, and the center wavelength of fiber optic grating 3.n is 1550.1nm. Under different wind speeds, the wavelengths on spectrometers 6.0, 6.1, and 6.n are as follows: Figure 2 , Figure 3 , Figure 4 As shown.

[0043] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A power-compensated multi-point wind speed detection device, characterized in that, include: A pump light source, a hot-wire optical fiber, and a doped optical fiber amplifier that are sequentially and alternately connected to the pump light source; A fiber grating is placed around the hot-wire optical fiber. The fiber grating is connected to the middle end of the fiber optic circulator. The output end of the fiber optic circulator is connected to the spectrometer. The power-compensated multi-point wind speed detection device first turns on the power of the wind speed detection device and uses a spectrometer to detect the wavelength of the corresponding fiber optic grating at this time; then the wind tunnel is opened to change the temperature around the hot-wire fiber and the spectrometer is used to detect the wavelength of the corresponding fiber optic grating at this time. Then, by comparing the wavelength changes before and after the fiber grating, the wind tunnel wind speed can be obtained by inversion. The hot-wire fiber is a high-loss fiber, and the doped fiber amplifier is used to compensate for the optical attenuation caused by the loss of the hot-wire fiber. A hot-wire fiber optic connection is used to connect to a doped fiber amplifier to compensate for light loss due to the hot-wire fiber. The compensated light then enters the next section of the hot-wire fiber to monitor the wind speed at the next point, and so on, until the Nth point, where the wavelengths of N spectrometers are recorded sequentially. The wind tunnel to be tested is placed above the hot-wire optical fiber.

2. The power-compensated multi-point wind speed detection device as described in claim 1, characterized in that, The input end of the fiber optic circulator is connected to a broadband light source.

3. The power-compensated multi-point wind speed detection device as described in claim 1, characterized in that, The hot-wire optical fiber is a high-loss cobalt-doped optical fiber, and the coating layer of the high-loss cobalt-doped optical fiber has been removed.

4. The power-compensated multi-point wind speed detection device as described in claim 1, characterized in that, The pump source is a semiconductor laser.

5. The power-compensated multi-point wind speed detection device as described in claim 1, characterized in that, The wavelength amplification range of the doped fiber amplifier includes the output wavelength of the pump light source.

6. The power-compensated multi-point wind speed detection device as described in claim 1, characterized in that, The doped fiber amplifier is an erbium-doped fiber amplifier.

7. A power-compensated multi-point wind speed detection method, employing a power-compensated multi-point wind speed detection device as described in any one of claims 1-6, characterized in that, include: Turn on the power of the wind speed detection device and use a spectrum analyzer to detect the wavelength of the corresponding fiber optic grating at this time; The wind tunnel was opened to change the temperature around the hot-wire fiber, and the wavelength of the corresponding fiber grating was detected using a spectrometer. By comparing the wavelength changes before and after the fiber grating, the wind tunnel wind speed can be obtained through inversion.

8. The power-compensated multi-point wind speed detection method as described in claim 7, characterized in that, The wind tunnels above the hot-wire fiber optic cables were opened one by one, and the wind speeds at different points in the wind tunnels were measured.

9. The power-compensated multi-point wind speed detection method as described in claim 7, characterized in that, The doped fiber amplifier is used to compensate for the light loss after entering the hot-wire fiber.

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