Self-sensing monitoring equipment based on temperature sensing

Abstract

The utility model relates to the field of optical fiber monitoring, in particular to self-sensing monitoring equipment based on temperature sensing, which comprises a laser assembly, a detection assembly, a demodulation assembly and a shell. Accurate modulation of laser signals is achieved through the acousto-optic modulator and the electro-optic modulator, the signal strength is enhanced through the erbium-doped fiber laser amplifier, the signal-to-noise ratio of the system is improved, efficient transmission and accurate detection of signals are ensured through the optical fiber circulator and the double-balance electro-optic detector in the detection assembly, and the detection accuracy is improved. The demodulation assembly realizes accurate demodulation and extraction of temperature information through cooperative work of a standard function generator, a radio frequency mixer and a low-pass filter, the application of a high-speed data acquisition card enables the system to process a large amount of data in real time, the timeliness and continuity of monitoring are improved, efficient demodulation of sound signals is realized, and the accuracy of the system is improved. The overall structure is simple, monitoring precision is high, and stability is good.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of optical fiber monitoring, especially based on temperature sensing's self -perception monitoring device. BACKGROUND

[0002] With the rapid development of optical fiber communication technology and optical fiber sensing technology, optical fiber sensors are increasingly widely used in the detection field, and strict monitoring of the tunnel is required in the tunnel to prevent abnormal tunnel structure from causing critical situations.

[0003] The common application technology in the domestic market at present is distributed vibration optical fiber technology, which can only perceive events according to vibration, has low detection accuracy, high detection false alarm risk and can only use special vibration optical fiber for detection and many other disadvantages. With the continuous development and improvement of optical fiber sensing technology, the distributed optical fiber sound temperature sensing system, as a frontier field of distributed optical fiber sensing technology, realizes comprehensive monitoring of sound waves and temperature signals, thereby accurately and stably reconstructing the external disturbance model, reflecting the extremely rich feature information of the measured object from the perspective of the spectral diversity of the sound signal and measuring the temperature of each point. The traditional equipment has large phase noise, insensitive phase detection and biased precision. SUMMARY

[0004] Therefore, the utility model provides a kind of based on temperature sensing's self -perception monitoring device to overcome the problem of insensitive phase detection and biased precision in the prior art.

[0005] To achieve the above purpose, the utility model provides a kind of based on temperature sensing's self -perception monitoring device, comprising;

[0006] Laser assembly;

[0007] Detection assembly, connected with the laser assembly;

[0008] Demodulation assembly, connected with detection assembly, and is arranged at the end of detection assembly away from laser assembly;

[0009] Shell, which is provided with the laser assembly, the detection assembly and the demodulation assembly, the front panel of shell is provided with laser electric switch and FC / APC single mode optical fiber interface, laser assembly is connected with laser electric switch, demodulation assembly is connected with FC / APC single mode optical fiber interface.

[0010] Further, the laser assembly includes a laser, a fiber beam splitter connected to the laser, an acousto-optic modulator connected to the fiber beam splitter, an electro-optic modulator connected to the acousto-optic modulator, a polarization beam splitter connected to the electro-optic modulator, an erbium-doped fiber laser amplifier connected to the polarization beam splitter, and an interference filter connected to the erbium-doped fiber laser amplifier.

[0011] The detection assembly comprises a fiber optic circulator, a fiber coupler-brancher connected with the fiber optic circulator, and a double balanced electro-optic detector connected with the fiber coupler-brancher.

[0012] The demodulation assembly comprises a standard function generator, a radio frequency mixer connected with the standard function generator, a low pass filter connected with the radio frequency mixer, and a high speed data acquisition card connected with the low pass filter.

[0013] Further, the interference filter is further connected with the fiber optic circulator, the fiber coupler-brancher is further connected with the fiber beam splitter, and the double balanced electro-optic detector is further connected with the radio frequency mixer.

[0014] Further, the shell is provided with a cabinet air outlet on both sides.

[0015] Further, the front panel is provided with a USB interface on the left side of the surface, an RJ45 gigabit network interface on the right side of the USB interface, a GPS signal input port on the right side of the RJ45 gigabit network interface, an indicator light between the laser electric switch and the FC / APC single mode fiber interface, and handles and support pieces perpendicular to each other on both sides of the front panel, wherein the handles and the support pieces are fixedly connected with the front panel respectively.

[0016] Further, the rear panel of the shell is provided with a 220V AC connection port and a cabinet air inlet.

[0017] Further, the cabinet air inlet is provided with a cabinet cooling fan parallel to the rear panel.

[0018] Further, the shell is provided with an AC-DC converter connected with the 220V AC connection port.

[0019] Further, the AC-DC converter converts AC power into three groups of DC power with voltages of 5V, 12V and 24V respectively.

[0020] Further, the DC power with a voltage of 5V is used to power the laser, the double balanced electro-optic detector and the erbium-doped fiber laser amplifier, the DC power with a voltage of 12V is used to power the high speed data acquisition card and the cabinet cooling fan, and the DC power with a voltage of 24V is used to power the acousto-optic modulator and the electro-optic modulator.

[0021] Compared with the prior art, the beneficial effects of the utility model lie in that the accurate modulation of laser signal is realized through the acousto-optic modulator and the electro-optic modulator, the signal intensity is enhanced through the erbium-doped fiber laser amplifier, the signal noise ratio of the system is improved, the high-efficiency transmission and accurate detection of the signal are ensured through the fiber loop and the double balanced electro-optic detector in the detection assembly, the accurate demodulation and extraction of the temperature information are realized through the cooperative work of the standard function generator, the radio frequency mixer and the low pass filter in the demodulation assembly, the real-time processing of a large amount of data is realized through the application of the high-speed data acquisition card, the timeliness and continuity of the monitoring are improved, the efficient demodulation of the sound signal is realized, and the overall structure is simple, the monitoring precision is high and the stability is good. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The structure schematic view of the self-sensing monitoring equipment based on temperature sensing provided for the utility model embodiment is provided.

[0023] Figure 2 The rear view of the self-sensing monitoring equipment based on temperature sensing provided for the utility model embodiment is provided.

[0024] Figure 3 The sectional view of the self-sensing monitoring equipment based on temperature sensing provided for the utility model embodiment is provided.

[0025] Figure 4 The internal structure schematic view of the self-sensing monitoring equipment based on temperature sensing provided for the utility model embodiment is provided.

[0026] Figure 5 The internal circuit diagram of the self-sensing monitoring equipment based on temperature sensing provided for the utility model embodiment is provided.

[0027] In the drawing: 1 - shell, 2 - front panel, 3 - rear panel, 4 - handle, 5 - support piece, 6 - USB interface, 7 - RJ45 gigabit network port, 8 - GPS signal input port 8, 9 - FC / APC single-mode optical fiber interface, 10 - indicator light, 11 - laser electric switch, 12 - case air outlet, 13 - case air inlet, 14 - 220V AC connection port, 15 - case cooling fan, 16 - AC-DC converter, 17 - optical fiber beam splitter, 18 - acousto-optic modulator, 19 - electro-optic modulator, 20 - erbium-doped fiber laser amplifier, 21 - interference filter, 22 - fiber loop, 23 - fiber coupling-shunt, 24 - double balanced electro-optic detector, 25 - standard function generator, 26 - radio frequency mixer, 27 - low pass filter, 28 - high-speed data acquisition card, 29 - polarization beam splitter, 30 - laser. DETAILED DESCRIPTION

[0028] In order to make the purpose and advantages of the utility model more clearly and obviously, the utility model will be further described below in combination with examples; it should be understood that the specific examples described herein are only used to explain the utility model and not to limit the utility model.

[0029] The preferred embodiments of the utility model will be described below with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the utility model and not to limit the protection scope of the utility model.

[0030] It should be noted that, in the description of the utility model, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the direction or positional relationship terms based on the direction or positional relationship shown in the drawings, which are only for the convenience of description and not to indicate or imply that the device or component must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0031] In addition, it should also be noted that, in the description of the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two components. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0032] Please refer to Figures 1 to 5 , which are respectively the structure schematic diagram of the self-sensing monitoring equipment based on temperature sensing provided by the utility model example; the rear view of the self-sensing monitoring equipment based on temperature sensing provided by the utility model example; the sectional view of the self-sensing monitoring equipment based on temperature sensing provided by the utility model example; the internal structure schematic diagram of the self-sensing monitoring equipment based on temperature sensing provided by the utility model example; the internal circuit diagram of the self-sensing monitoring equipment based on temperature sensing provided by the utility model example;

[0033] Specifically, the embodiment of the application provides a kind of self-sensing monitoring equipment based on temperature sensing, comprising:

[0034] Detection component, with the laser module is connected;

[0035] Demodulation component, with detection component connection, and it is arranged at the end of the detection component away from laser module;

[0036] A housing 1 is provided with the laser assembly, the probe assembly and the demodulation assembly, and a front panel of the housing is provided with a laser switch 11 and an FC / APC single-mode fiber interface 9, the laser assembly is connected with the laser switch 11, and the demodulation assembly is connected with the FC / APC single-mode fiber interface 9.

[0037] In the embodiment, the seed laser emitted by the laser 30 is divided into two paths by the 90:10 fiber splitter 17, one of the seed lights I1 is introduced into the acousto-optic modulator 18 for high-speed chopping and frequency modulation, to generate a laser pulse train with continuous adjustable repetition frequency, the laser pulse is further chopped by the high-speed electro-optic modulator 19 combined with the polarization beam splitter 29, the chopped laser pulse is amplified in pulse energy by the erbium-doped fiber laser amplifier 20, and the amplified laser pulse is coupled into the fiber circulator 22 after the broadband spontaneous emission generated in the energy amplification is filtered by the narrowband interference filter, the returned Rayleigh scattering light Ir and the other seed light I2 split by the fiber splitter 17 are coupled into the 2×2 fiber coupling-splitter 23, to generate beat signals of (IR) and (I2): wherein E1 and E2 are the optical fields of (IR) and (I2) respectively, θ is the polarization angle between (IR) and (I2), Δω is the modulation frequency of the acousto-optic modulator 18 (the frequency difference between IR and I2), φ is the phase difference between (IR) and (I2), and the disturbance information of the sensing fiber can be directly embodied in the amplitude ER and the phase φ of the beat signal, the double-balanced electro-optic detector 24 detects the two beat signals with the same amplitude and the phase difference of π output by the fiber coupling-splitter 23, to directly obtain the differential alternating component of the two beat signals, that is The differential alternating signal is mixed with the standard alternating signal (cos(Δω) and sin(Δω)) with fixed phase and amplitude and the frequency of Δω generated by the standard function generator 25, the standard alternating signal is mixed in the radio frequency mixer 26, the output signal of the radio frequency mixer 26 is filtered by the low-pass filter 27 to remove the high-frequency signal component, and the real-time phase information φ(t) of the scattering light generated by the single laser pulse is recorded and preprocessed by the high-speed data acquisition card 28, wherein the time t corresponds to the position z = ct / (2n) of the sensing fiber, c is the speed of light in vacuum, n is the refractive index of the fiber, and φ(z) is the phase information along the fiber distribution measured by the single laser pulse, in the actual measurement, the time sequence data φ(i, z) of different laser pulses (i) is obtained by using the high-repetition laser detection, and the spatial and time-resolved three-dimensional phase distribution φ(ti, z) is obtained based on the laser pulse occurrence time. The change of the phase of the fiber at a specific position node z with the local time (different laser pulse occurrence time) directly reflects the strain information s (= CΔφi, C is the strain coefficient of the fiber) sensed at the position, and further the real-time information of the strain frequency and intensity sensed at different positions is obtained by performing time domain Fourier transform on φ(ti, z).

[0038] Specifically, precise modulation of the laser signal is achieved by the acousto-optic modulator 18 and the electro-optic modulator 19, and the erbium-doped fiber laser amplifier 20 enhances the signal strength and improves the signal-to-noise ratio of the system. The fiber circulator 22 and the double-balanced electro-optic detector 24 in the detection assembly ensure efficient transmission and accurate detection of the signal. The standard function generator 25, the radio frequency mixer 26, and the low-pass filter 27 in the demodulation assembly work together to accurately demodulate and extract the temperature information. The application of the high-speed data acquisition card 28 enables the system to process a large amount of data in real time, improving the timeliness and continuity of monitoring, and achieving efficient demodulation of the sound signal. The overall structure is simple, the monitoring accuracy is high, and the stability is good.

[0039] Specifically, the laser assembly includes a laser 30, a fiber beam splitter 17 connected to the laser 30, an acousto-optic modulator 18 connected to the fiber beam splitter 17, an electro-optic modulator 19 connected to the acousto-optic modulator 18, a polarization beam splitter 29 connected to the electro-optic modulator 19, and an erbium-doped fiber laser amplifier 20 connected to the polarization beam splitter 29.

[0040] The detection assembly includes a fiber circulator 22, a fiber coupling-splitter 23 connected to the fiber circulator 22, and a double-balanced electro-optic detector 24 connected to the fiber coupling-splitter 23.

[0041] The demodulation assembly includes a standard function generator 25, a radio frequency mixer 26 connected to the standard function generator 25, a low-pass filter 27 connected to the radio frequency mixer 26, and a high-speed data acquisition card 28 connected to the low-pass filter 27.

[0042] Specifically, the interference filter 21 is also connected to the fiber circulator 22, the fiber coupling-splitter 23 is also connected to the fiber beam splitter 17, and the double-balanced electro-optic detector 24 is also connected to the radio frequency mixer 26.

[0043] Specifically, the housing 1 is provided with cabinet air outlets 12 on both sides.

[0044] Specifically, the cabinet air outlets 12 on both sides of the housing 1 effectively promote the air circulation inside the device, improve the heat dissipation efficiency, and maintain the ideal working temperature of the internal components of the device, improving its reliability and stability, which is conducive to improving the monitoring accuracy. The handles 4 provided on both sides of the front panel 2 enhance the portability of the device, making it easy to carry and adjust the position. The support sheet 5 helps the device to be placed in different environments and positions, which is conducive to use in different places and improves the practicality of the device.

[0045] Specifically, the front panel surface left side is provided with a USB interface 6, the right side of the USB interface 6 is provided with an RJ45 gigabit network port 7, the right side of the RJ45 gigabit network port 7 is provided with a GPS signal input port 8, an indicator light 10 is provided between the laser electric switch 11 and the FC / APC single-mode fiber interface 9, and the indicator light 10 is turned on and off when the laser electric switch 11 is turned on and off. The front panel 2 is provided with a handle 4 and a support piece 5 perpendicular to each other, wherein the handle 4 and the support piece 5 are fixedly connected with the front panel 2.

[0046] Specifically, the rear panel 3 of the shell is provided with a 220V AC connection port 14 and a cabinet air inlet 13.

[0047] Specifically, the cabinet air inlet 13 is provided with a cabinet cooling fan 15 parallel to the rear panel 3.

[0048] Specifically, by integrating multiple interfaces on the front panel 2, the compatibility and data transmission capability of the device are greatly enhanced, the operation flexibility of the device is improved, and the needs of different application scenarios are met. The 220V AC connection port 14 and the cabinet air inlet 13 provided on the rear panel 3 ensure the power supply and cooling performance of the device. By providing a cooling fan at the cabinet air inlet 13, the temperature of the device during long-time operation is effectively reduced, the stability and reliability of the system are improved, and the device can continuously and stably operate in various working environments.

[0049] Specifically, the shell 1 is provided with an AC-DC converter 16 connected with the 220V AC connection port 14.

[0050] Specifically, the AC-DC converter 16 converts AC power into three groups of DC power with voltages of 5V, 12V and 24V respectively.

[0051] Specifically, the 5V DC power supplies power to the laser 30, the double-balanced electro-optical detector 24 and the erbium-doped fiber laser amplifier 20, the 12V DC power supplies power to the high-speed data acquisition card 28 and the cabinet cooling fan 15, and the 24V DC power supplies power to the acousto-optic modulator 18 and the electro-optic modulator 19.

[0052] Specifically, by providing the required precise voltage for different components, unnecessary energy loss is avoided, and the energy efficiency of the overall system is improved. By using a multi-output converter to meet the power supply needs of all components, the system structure is simplified, and the reliability and practical value are improved.

[0053] Thus far, the technical scheme of the present application has been described in connection with the preferred embodiments shown in the drawings, but it is readily understood by those skilled in the art that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the relevant technical features without deviating from the principles of the present application, and the technical schemes after these changes or replacements will all fall within the protection scope of the present application.

[0054] The above description is merely preferred embodiments of the present application and is not intended to limit the present application; for those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A self-aware monitoring device based on temperature sensing, characterized in that, The application relates to a laser demodulation device. The device comprises a laser assembly, a detection assembly connected with the laser assembly, a demodulation assembly connected with the detection assembly and arranged at the end of the detection assembly far from the laser assembly, and a shell in which the laser assembly, the detection assembly and the demodulation assembly are arranged, wherein the front panel of the shell is provided with a laser electric switch and an FC / APC single-mode optical fiber interface, the laser assembly is connected with the laser electric switch, and the demodulation assembly is connected with the FC / APC single-mode optical fiber interface. The laser assembly comprises a laser, a fiber splitter connected with the laser, an acousto-optic modulator connected with the fiber splitter, an electro-optic modulator connected with the acousto-optic modulator, a polarization beam splitter connected with the electro-optic modulator, and an erbium-doped fiber laser amplifier connected with the polarization beam splitter. The detection assembly comprises a fiber circulator, a fiber coupler-divider connected with the fiber circulator, and a double-balanced electro-optic detector connected with the fiber coupler-divider. The demodulation assembly comprises a standard function generator, a radio frequency mixer connected with the standard function generator, a low-pass filter connected with the radio frequency mixer, and a high-speed data acquisition card connected with the low-pass filter.

2. The temperature-sensing based self-aware monitoring device of claim 1, wherein, The interference filter is also connected with the fiber circulator, the fiber coupler-divider is also connected with the fiber splitter, and the double-balanced electro-optic detector is also connected with the radio frequency mixer. The shell is provided with cabinet air outlets on both sides. The front panel is provided with a USB interface on the left side, an RJ45 gigabit network interface on the right side of the USB interface, a GPS signal input port on the right side of the RJ45 gigabit network interface, and indicator lights between the laser electric switch and the FC / APC single-mode optical fiber interface, and the front panel is provided with handles and supporting pieces perpendicular to each other on both sides, wherein the handles and the supporting pieces are fixedly connected with the front panel.

3. The temperature-sensing based self-aware monitoring device of claim 2, wherein, The rear panel of the shell is provided with a 220V AC connection port and a cabinet air inlet.

4. The temperature-sensing based self-aware monitoring device of claim 1, wherein, The cabinet air inlet is provided with a cabinet cooling fan parallel to the rear panel.

5. The temperature-sensing based self-aware monitoring device of claim 1, wherein, The shell is provided with an AC-DC converter connected with the 220V AC connection port.

6. The temperature-sensing based self-aware monitoring device of claim 2, wherein, The AC-DC converter converts AC power into three groups of DC power with voltages of 5V, 12V and 24V.

7. The temperature-sensing based self-aware monitoring device of claim 6, wherein, The DC power with the voltage of 5V is used to power the laser, the double-balanced electro-optic detector and the erbium-doped fiber laser amplifier, the DC power with the voltage of 12V is used to power the high-speed data acquisition card and the cabinet cooling fan, and the DC power with the voltage of 24V is used to power the acousto-optic modulator and the electro-optic modulator.

8. The temperature-sensing based self-aware monitoring device of claim 7, wherein, ​ 9. The temperature-sensing based self-aware monitoring device of claim 8, wherein, ​ 10. The temperature-sensing based self-aware monitoring device of claim 9, wherein, ​

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