Fiber optic sensor air pressure equalization device

Abstract

The utility model discloses a kind of optical fiber sensor air pressure equalization device, including detection module and pressure regulating module;Detection module includes protective shell, detection optical fiber and protective gas;Detection optical fiber and protective gas are all arranged in protective shell;Pressure regulating module includes gas transmission channel, automatic regulating switch and gas storage structure;One end of gas transmission channel is communicated with protective shell, and other end is communicated with gas storage structure;Automatic regulating switch is set in gas transmission channel, for adjusting the on-off of gas path between protective shell and gas storage structure.The device is by increasing pressure regulating module, realize the gas circulation between protective shell and gas storage structure, and can be through automatic regulating switch control gas circulation direction, so that the gas pressure in protective shell keeps stable, solve the problem that the gas pressure in protective shell is changed due to temperature or pressure variation and affect detection optical fiber measurement result, reduce measurement error, improve measurement accuracy.

Description

Technical Field

[0001] This utility model relates to the field of fiber optic sensing and measurement technology, and in particular to a fiber optic sensor pressure equalization device. Background Technology

[0002] Fiber optic sensors, with their advantages of multi-point high-density measurement, all-photoelectric passive operation, embedded in-situ monitoring, and long-distance networking, have significant application prospects in the industrial field. However, in extreme high-temperature, high-pressure, and high-humidity environments, the coating material of the fiber optic protective layer is directly exposed to the air. Water molecules or oxygen in the air will accelerate the aging process of the fiber optic material, causing changes in the refractive index inside the fiber, leading to a decrease in the fiber's transmission performance, and thus causing a sharp decline in the lifespan of the fiber optic sensor under extreme conditions.

[0003] To improve the lifespan of fiber optic sensors, one effective method is to protect the fiber optic detection front end of the sensor with a stable gas. However, changes in the pressure of the sealed protective gas will affect the measurement accuracy of the fiber optic sensor and cause measurement errors. Utility Model Content

[0004] This invention provides a fiber optic sensor pressure equalization device to eliminate measurement errors caused by fluctuations in protective gas pressure and improve measurement accuracy.

[0005] This utility model provides a fiber optic sensor pressure equalization device, including a detection module and a pressure regulation module;

[0006] The detection module includes a protective housing, a detection optical fiber, and a protective gas; both the detection optical fiber and the protective gas are disposed inside the protective housing.

[0007] The pressure regulating module includes a gas transmission channel, an automatic regulating switch, and a gas storage structure; one end of the gas transmission channel is connected to the protective shell, and the other end is connected to the gas storage structure; the automatic regulating switch is disposed in the gas transmission channel and is used to regulate the opening and closing of the gas passage between the protective shell and the gas storage structure.

[0008] Optionally, the automatic adjustment switch is a two-way regulating air valve;

[0009] The bidirectional regulating valve is used to control the gas storage structure to automatically output gas to the protective shell when the gas pressure inside the protective shell is less than a first preset pressure, and is also used to control the protective shell to automatically output gas to the gas storage structure when the gas pressure inside the protective shell is greater than a second preset pressure; the second preset pressure is greater than or equal to the first preset pressure.

[0010] Optionally, the pressure regulating module includes a gas supply unit and a gas discharge unit;

[0011] The gas replenishment unit includes a first gas transmission channel, a first one-way regulating valve, and a first gas storage structure. One end of the first gas transmission channel is connected to the protective shell, and the other end of the first gas transmission channel is connected to the first gas storage structure. The first one-way regulating valve is located in the first gas transmission channel and is used to regulate the opening and closing of the gas passage between the protective shell and the first gas storage structure so that the gas in the first gas storage structure enters the protective shell.

[0012] The gas emission unit includes a second gas transmission channel, a second one-way regulating valve, and a second gas storage structure. One end of the second gas transmission channel is connected to the protective shell, and the other end of the second gas transmission channel is connected to the second gas storage structure. The second one-way regulating valve is located inside the second gas transmission channel and is used to regulate the opening and closing of the gas passage between the protective shell and the second gas storage structure, so that the gas inside the protective shell enters the second gas storage structure.

[0013] Optionally, the automatic adjustment switch includes a mechanical valve structure.

[0014] Optionally, the automatic adjustment switch includes a first solenoid valve structure;

[0015] The fiber optic sensor pressure equalization device further includes a pressure detection module and a first control module; the pressure detection module includes a pressure detection signal output terminal, the first control module includes a pressure detection signal receiving terminal and a first control signal output terminal, and the first electromagnetic valve structure includes a first control signal receiving terminal.

[0016] The pressure detection signal output terminal is connected to the pressure detection signal receiving terminal, and the first control signal output terminal is connected to the first control signal receiving terminal; the first control module is used to determine the first control signal output by the first control signal output terminal based on the pressure signal received by the pressure detection signal receiving terminal in order to control the conduction state of the first solenoid valve structure.

[0017] Optionally, the automatic adjustment switch includes a second solenoid valve structure;

[0018] The fiber optic sensor pressure equalization device further includes a temperature detection module and a second control module; the temperature detection module includes a temperature detection signal output terminal, the second control module includes a temperature detection signal receiving terminal and a second control signal output terminal, and the second electromagnetic valve structure includes a second control signal receiving terminal.

[0019] The temperature detection signal output terminal is connected to the temperature detection signal receiving terminal, and the second control signal output terminal is connected to the second control signal receiving terminal; the second control module is used to determine the second control signal output by the second control signal output terminal based on the temperature signal received by the temperature detection signal receiving terminal in order to control the conduction state of the second electromagnetic valve structure.

[0020] Optionally, the fiber optic sensor pressure equalization device further includes a demodulation module, the input of which is connected to the output of the detection fiber.

[0021] Optionally, the demodulation module includes a conductive optical fiber and a demodulator;

[0022] One end of the conductive optical fiber is connected to the output end of the detection optical fiber, and the second end of the conductive optical fiber is connected to the demodulator.

[0023] Optionally, the demodulator includes a test light source, an optical fiber circulator, and an optical fiber spectrometer;

[0024] One end of the test light source is connected to the first end of the fiber optic circulator, the second end of the fiber optic circulator is connected to the second end of the conductive fiber, and the third end of the fiber optic circulator is connected to the fiber optic spectrometer.

[0025] Optionally, the fiber optic sensor pressure equalization device further includes a sealing module;

[0026] The input end of the demodulation module is connected to the output end of the detection optical fiber within the sealed module.

[0027] The fiber optic sensor pressure equalization device provided by this utility model achieves gas flow between the protective shell and the gas storage structure by adding a pressure regulation module. It can also control the direction of gas flow through an automatic adjustment switch, thereby keeping the gas pressure in the protective shell stable. This solves the problem that changes in gas pressure inside the protective shell caused by temperature or pressure variations affect the measurement results of the detection fiber optic cable, reduces the measurement error of the fiber optic sensor pressure equalization device, and improves the measurement accuracy. Attached Figure Description

[0028] Figure 1 A schematic diagram of a fiber optic sensor pressure equalization device provided in an embodiment of this utility model;

[0029] Figure 2 A schematic diagram of another fiber optic sensor pressure equalization device provided in this embodiment of the present invention;

[0030] Figure 3 A schematic diagram of a one-way regulating mechanical air valve structure provided for an embodiment of this utility model;

[0031] Figure 4 A schematic diagram of another fiber optic sensor pressure equalization device provided in this embodiment of the present invention;

[0032] Figure 5 A schematic diagram of another fiber optic sensor pressure equalization device provided in this embodiment of the present invention;

[0033] Figure 6 A schematic diagram of another fiber optic sensor pressure equalization device provided in this embodiment of the present invention;

[0034] Figure 7 A schematic diagram of another fiber optic sensor pressure equalization device provided in this embodiment of the present invention. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0036] Figure 1 A schematic diagram of a fiber optic sensor pressure equalization device is provided for an embodiment of this utility model, as shown below. Figure 1 As shown, the fiber optic sensor pressure equalization device includes a detection module 10 and a pressure regulation module 20.

[0037] The detection module 10 includes a protective housing 101, a detection optical fiber 102, and a protective gas 103; the detection optical fiber 102 and the protective gas 103 are both disposed inside the protective housing 101.

[0038] The pressure regulating module 20 includes a gas transmission channel 201, an automatic regulating switch 202, and a gas storage structure 203. One end of the gas transmission channel 201 is connected to the protective housing 101, and the other end is connected to the gas storage structure 203. The automatic regulating switch 202 is located inside the gas transmission channel 201 and is used to regulate the opening and closing of the gas passage between the protective housing 101 and the gas storage structure 203.

[0039] Specifically, the detection fiber 102 is placed inside the protective housing 101, and the protective housing 101 is filled with a protective gas 103. For example, the protective gas 103 can be an inert gas or an inactive gas such as N2, which helps extend the service life of the detection fiber 102. However, when the fiber optic sensor pressure equalization device is in an extreme measurement environment, since the detection fiber 102 in the detection module 10 utilizes the modulation of light propagating in the fiber by external factors (such as temperature, pressure, strain, etc.) to change its characteristics (such as intensity, phase, wavelength, etc.) to achieve high-sensitivity measurement of the measured parameter, if the detection module 10 is in a high-temperature measurement environment, such as 500℃~2000℃, the temperature change may cause pressure changes in the protective gas 103 inside the protective housing 101, thus affecting the measurement accuracy of the detection fiber 102. For example, the protective housing 101 is a sealed shell, which can be a high-temperature resistant metal protective housing or a high-temperature protective housing made of various corundum materials. The detection fiber 102 can be a single-point fiber optic sensor or a distributed fiber optic sensor.

[0040] Furthermore, the pressure regulation module 20 is used to regulate the gas pressure inside the protective housing 101, thereby eliminating measurement errors caused by pressure fluctuations in the protective gas 103 and improving the measurement accuracy of the detection fiber optic 102. The pressure regulation module 20 includes a gas transmission channel 201, an automatic adjustment switch 202, and a gas storage structure 203. The gas stored in the gas storage structure 203 is the same as the protective gas 103 in the protective housing 101, and its storage capacity is much larger than that of the protective gas 103 in the protective housing 101. Therefore, the effect of the reduced gas pressure in the gas storage structure 203 caused by filling the protective housing 101 with gas can be ignored. For example, the gas storage structure 203 can be a gas reservoir. One end of the gas transmission channel 201 is connected to the protective housing 101, and the other end is connected to the gas storage structure 203, for realizing gas exchange between the protective housing 101 and the gas storage structure 203. An automatic adjustment switch 202 is installed in the gas transmission channel 201 to adjust the opening and closing of the gas path between the protective housing 101 and the gas storage structure 203, thereby keeping the gas pressure in the protective housing 101 constant and reducing the detection error of the detection fiber 102.

[0041] This invention, through the addition of a pressure regulation module to the fiber optic sensor pressure equalization device, enables gas flow between the protective shell and the gas storage structure. Furthermore, an automatic adjustment switch controls the direction of gas flow, thereby maintaining stable gas pressure within the protective shell. This solves the problem of gas pressure variations within the protective shell affecting the measurement results of the optical fiber due to temperature or pressure changes, reducing measurement errors and improving measurement accuracy.

[0042] Optionally, the automatic adjustment switch 202 is a two-way regulating gas valve; the two-way regulating gas valve is used to control the gas storage structure 203 to output gas to the protective housing 101 when the gas pressure inside the protective housing 101 is less than the first preset pressure, and is also used to control the protective housing 101 to output gas to the gas storage structure 203 when the gas pressure inside the protective housing 101 is greater than the second preset pressure; the second preset pressure is greater than or equal to the first preset pressure.

[0043] Specifically, refer to Figure 1 The automatic adjustment switch 202 controls the flow direction of the protective gas 103 within the gas transmission channel 201. When the gas pressure inside the protective housing 101 is less than a first preset pressure, it indicates that the gas pressure inside the protective housing 101 is lower than the standard level. At this time, the bidirectional regulating valve controls the gas storage structure 203 to output gas to the protective housing 101, so that the gas pressure inside the protective housing 101 returns to the standard level. The standard level refers to the gas pressure inside the protective housing 101 at which the measurement error introduced by the detection fiber optic cable 102 due to the gas pressure is minimized. When the gas pressure inside the protective housing 101 is greater than a second preset pressure, it indicates that the gas pressure inside the protective housing 101 is greater than the standard level. At this time, the bidirectional regulating valve controls the protective housing 101 to output gas to the gas storage structure 203, so that the gas pressure inside the protective housing 101 decreases, thereby returning to the standard level.

[0044] The second preset pressure is greater than or equal to the first preset pressure. When the second preset pressure is greater than the first preset pressure, if the gas pressure inside the protective housing 101 is greater than the first preset pressure but less than the second preset pressure, the bidirectional regulating gas valve is closed, preventing the flow of protective gas 103 in the gas transmission channel 201. This means that when the gas pressure inside the protective housing 101 is within this range, the measurement error of the detection fiber optic 102 is relatively small. When the second preset pressure is equal to the first preset pressure, the bidirectional regulating gas valve is only closed when the gas pressure inside the protective housing 101 is equal to the first preset pressure.

[0045] Optionally, Figure 2 A schematic diagram of another fiber optic sensor pressure equalization device provided in this embodiment of the present invention is shown below. Figure 2 As shown, the pressure regulation module includes a gas replenishment unit 30 and a gas discharge unit 40;

[0046] The gas replenishment unit 30 includes a first gas transmission channel 301, a first one-way regulating valve 302, and a first gas storage structure 303. One end of the first gas transmission channel 301 is connected to the protective shell 101, and the other end of the first gas transmission channel 301 is connected to the first gas storage structure 303. The first one-way regulating valve 302 is located inside the first gas transmission channel 301 and is used to regulate the opening and closing of the gas passage between the protective shell 101 and the first gas storage structure 303 so that the gas in the first gas storage structure 303 can enter the protective shell 101.

[0047] The gas emission unit 40 includes a second gas transmission channel 401, a second one-way regulating valve 402, and a second gas storage structure 403. One end of the second gas transmission channel 401 is connected to the protective housing 101, and the other end of the second gas transmission channel 401 is connected to the second gas storage structure 403. The second one-way regulating valve 402 is located inside the second gas transmission channel 401 and is used to regulate the opening and closing of the gas passage between the protective housing 101 and the second gas storage structure 403 so that the gas inside the protective housing 101 enters the second gas storage structure 403.

[0048] Specifically, refer to Figure 2 The gas replenishment unit 30 and the gas emission unit 40 can be two independent structures. The gas replenishment unit 30 includes a first gas transmission channel 301, a first one-way regulating valve 302, and a first gas storage structure 303. When the first one-way regulating valve 302 is in the open state, it only allows protective gas 103 to flow from the first gas storage structure 303 to the protective housing 101, meaning it can only increase the gas pressure in the protective housing 101. If the gas pressure inside the protective housing 101 is less than a first preset pressure, the first one-way regulating valve 302 is open, and protective gas 103 flows from the first gas storage structure 303 to the protective housing 101. If the gas pressure inside the protective housing 101 is greater than or equal to the first preset pressure, the first one-way regulating valve 302 should be in the closed state, preventing gas flow in the first gas transmission channel 301. (Continue to refer to...) Figure 2 The gas emission unit 40 includes a second gas transmission channel 401, a second one-way regulating valve 402, and a second gas storage structure 403. When the second one-way regulating valve 402 is in the open state, it only allows gas inside the protective housing 101 to enter the second gas storage structure 403, that is, it can only reduce the gas pressure inside the protective housing 101. If the gas pressure inside the protective housing 101 is greater than a second preset pressure, the second one-way regulating valve 402 is open, and the protective gas 103 enters the second gas storage structure 403 from the protective housing 101. If the gas pressure inside the protective housing 101 is less than or equal to the second preset pressure, the second one-way regulating valve 402 should be in the closed state, and gas flow in the second gas transmission channel 401 is not allowed.

[0049] In addition, the second gas storage structure 403 can be as follows: Figure 2 The independent structure shown is used to store excess gas in the protective casing 101. Alternatively, the second gas storage structure 403 can be omitted at one end of the second gas transmission channel 401. That is, when the gas pressure in the protective casing 101 is greater than the second preset pressure, the second one-way regulating valve 402 controls the protective gas to be discharged from the protective casing 101 through the second gas transmission channel 401 into the air. Alternatively, the second gas storage structure 403 can share a gas storage device with the first gas storage structure 303. That is, when the gas pressure in the protective casing 101 is greater than the second preset pressure, the second one-way regulating valve 402 controls the protective gas 103 to enter the shared gas storage device from the protective casing 101; when the gas pressure in the protective casing 101 is less than the first preset pressure, the first one-way valve 302 controls the protective gas 103 to enter the protective casing 101 from the shared gas storage device, thereby achieving the recycling of the protective gas 103 and reducing gas waste.

[0050] It should be noted that, Figure 2 The gas replenishment unit and the gas emission unit are located on the same side of the protective enclosure. However, it is understood that the gas replenishment unit and the gas emission unit can be located on different sides of the protective enclosure (not shown in the figure). Figure 2 Taking the shown orientation as an example, the gas replenishment unit is disposed on the upper side of the protective shell, and the gas emission unit is disposed on the lower side of the protective shell. This embodiment of the invention does not limit the positional relationship between the gas replenishment unit and the gas emission unit.

[0051] This utility model embodiment achieves gas pressure regulation inside the protective shell by separately setting a gas replenishment unit and a gas discharge unit, preventing the measurement accuracy of the fiber optic sensor pressure equalization device from deviating due to changes in gas pressure. In addition, the second gas storage structure in the gas discharge unit can be an independent gas storage structure, or it can share a gas storage device with the first gas storage structure, or it can be that the second gas storage structure is not set in the gas discharge unit, that is, the protective gas is discharged into the air. Through diversified settings, the fiber optic sensor pressure equalization device can be adapted to different working scenarios.

[0052] Optionally, the automatic adjustment switch includes a mechanical valve structure, wherein the mechanical valve structure can achieve bidirectional or unidirectional adjustment. For example, the unidirectional adjustment mechanical valve can be a mechanical spring structure. Figure 3 A schematic diagram of a one-way regulating mechanical air valve structure is provided for an embodiment of this utility model, as shown below. Figure 3As shown, when the gas pressure on the left side of the valve is greater than the gas pressure on the right side, the gas on the left side will push the spring to compress, allowing gas to enter from the left side of the valve to the right side. When the gas pressure on the left side of the valve is less than or equal to the gas pressure on the right side, the spring inside the valve retracts, and the valve closes, thus achieving one-way gas flow.

[0053] Will Figure 3 The one-way regulating mechanical air valves shown are respectively used as the first one-way air valve 302 and the second one-way air valve 402 in the fiber optic sensor air pressure equalization device, for reference. Figure 2 When the gas pressure of the protective shell 101 is less than the gas pressure of the first gas storage structure 303, the first one-way valve 302 causes the protective gas 103 to flow from the first gas storage structure 303 to the protective shell 101, thereby increasing the gas pressure of the protective shell 101; when the gas pressure of the protective shell 101 is greater than the gas pressure of the second gas storage structure 403, the second one-way valve 402 causes the protective gas 103 to flow from the protective shell 101 to the second gas storage structure 403, thereby decreasing the gas pressure of the protective shell 101.

[0054] Optionally, Figure 4 A schematic diagram of another fiber optic sensor pressure equalization device provided in this embodiment of the present invention is shown below. Figure 4 As shown, the automatic adjustment switch 202 includes a first solenoid valve structure 2022;

[0055] The fiber optic sensor pressure equalization device also includes a pressure detection module 501 and a first control module 502; the pressure detection module 501 includes a pressure detection signal output terminal 5011, the first control module 502 includes a pressure detection signal receiving terminal 5021 and a first control signal output terminal 5022, and the first electromagnetic valve structure 2022 includes a first control signal receiving terminal 2023.

[0056] The pressure detection signal output terminal 5011 is connected to the pressure detection signal receiving terminal 5021, and the first control signal output terminal 5022 is connected to the first control signal receiving terminal 2023. The first control module 502 is used to determine the first control signal output by the first control signal output terminal 5022 based on the pressure signal received by the pressure detection signal receiving terminal 5021 in order to control the conduction state of the first solenoid valve structure 2022.

[0057] Specifically, refer to Figure 4The first electromagnetic valve structure 2022 is an electronic component, which can be controlled to open and close using electronic signals, thus exhibiting higher sensitivity. The first electromagnetic valve structure 2022 can be a bidirectional or unidirectional venting valve. It is understood that if the first electromagnetic valve structure 2022 is a unidirectional venting valve, two independent gas transmission channels are required, and the two independent first electromagnetic valve structures 2022 are placed in the two independent gas transmission channels respectively, thereby achieving gas discharge and replenishment. This embodiment describes the first electromagnetic valve structure 2022 as a bidirectional venting valve, defining forward conduction as the first electromagnetic valve structure 2022 allowing the protective gas 103 to enter the gas storage structure 203 from the protective housing 101, and reverse conduction as the first electromagnetic valve structure 2022 allowing the protective gas 103 to enter the protective housing 101 from the gas storage structure 203.

[0058] Continue to refer to Figure 4 A portion of the pressure detection module 501 is located inside the protective housing 101. It is used to detect the gas pressure inside the protective housing 101 in real time and transmit the detected signal to the first control module 502 via the pressure detection signal output terminal 5011. For example, the pressure detection module 501 can be a pressure sensor. A first pressure threshold and a second pressure threshold are set in the first control module 502. When the gas pressure inside the protective housing 101 changes, the pressure detection signal receiver 5021 transmits the pressure detection signal to the first control module 502, where it is compared with the first and second pressure thresholds. When the measured pressure value is less than the first pressure threshold, the first control signal output terminal 5022 outputs a first control signal that reverses the conduction of the first solenoid valve structure 2022, allowing the protective gas 103 to enter the protective housing 101 from the gas storage structure 203, thereby increasing the gas pressure inside the protective housing 101. When the measured pressure value is greater than the second pressure threshold, the first control signal output from the first control signal output terminal 5022 causes the first solenoid valve structure 2022 to be forward-biased, that is, to allow the protective gas 103 to enter the gas storage structure 203 from the protective shell 101, thereby reducing the gas pressure in the protective shell 101. The second pressure threshold is greater than or equal to the first pressure threshold. When the measured pressure value is greater than or equal to the first pressure threshold and less than or equal to the second pressure threshold, the first control signal output from the first control signal output terminal 5022 causes the first solenoid valve structure 2022 to be closed.

[0059] Optionally, Figure 5 A schematic diagram of another fiber optic sensor pressure equalization device provided in this embodiment of the present invention is shown below. Figure 5 As shown, the automatic adjustment switch 202 includes a second solenoid valve structure 2024;

[0060] The fiber optic sensor pressure equalization device also includes a temperature detection module 601 and a second control module 602; the temperature detection module 601 includes a temperature detection signal output terminal 6011, the second control module 602 includes a temperature detection signal receiving terminal 6021 and a second control signal output terminal 6022, and the second electromagnetic valve structure 2024 includes a second control signal receiving terminal 2025.

[0061] The temperature detection signal output terminal 6011 is connected to the temperature detection signal receiving terminal 6021, and the second control signal output terminal 6022 is connected to the second control signal receiving terminal 2025; the second control module 602 is used to determine the second control signal output by the second control signal output terminal 6022 according to the temperature signal received by the temperature detection signal receiving terminal 6021 so as to control the conduction state of the second solenoid valve structure 2024.

[0062] Specifically, when the fiber optic sensor pressure equalization device is used for high-temperature detection, due to the thermal expansion and contraction effect, when the external temperature of the protective housing 101 changes, the internal temperature of the protective housing 101 will change accordingly, thereby causing the pressure of the protective gas 103 to increase or decrease. Therefore, by setting a temperature detection module 601 in the fiber optic sensor pressure equalization device, the gas pressure inside the protective housing 101 can be further adjusted, thereby further reducing the measurement error of the fiber optic sensor pressure equalization device.

[0063] Continue to refer to Figure 5 The second solenoid valve structure 2024 can be a bidirectional vent valve or a unidirectional vent valve. In this embodiment, the second solenoid valve structure 2024 is described as a bidirectional vent valve.

[0064] A portion of the temperature detection module 601 is located inside the protective housing 101 and is used to detect temperature changes within the protective housing 101. For example, the temperature detection module 601 can be a thermocouple. A first temperature threshold and a second temperature threshold are set in the second control module 602. When the temperature inside the protective housing 101 changes, the temperature detection signal receiver 6021 transmits the temperature detection signal to the second control module 602, where it is compared with the first and second temperature thresholds. When the measured temperature value is lower than the first temperature threshold, it indicates that the gas pressure inside the protective housing 101 is low. The second control signal output from the second control signal output terminal 6022 then reverses the conduction of the second solenoid valve structure 2025, allowing the protective gas 103 to enter the protective housing 101 from the gas storage structure 203, thereby increasing the gas pressure inside the protective housing 101. When the measured temperature value is greater than the second temperature threshold, it indicates that the gas pressure inside the protective casing 101 is relatively high. The second control signal output from the second control signal output terminal 6022 then forward-biasedly opens the second solenoid valve structure 2024, allowing the protective gas 103 to enter the gas storage structure 203 from the protective casing 101, thereby reducing the gas pressure inside the protective casing 101. The second temperature threshold is greater than or equal to the first temperature threshold. When the measured temperature value is greater than or equal to the first temperature threshold and less than or equal to the second temperature threshold, the second control signal output from the second control signal output terminal 6022 closes the second solenoid valve structure 2024.

[0065] This embodiment of the invention improves the speed of gas pressure regulation inside the protective shell by using an electromagnetic valve structure controlled by an electrical signal. At the same time, by adding a temperature detection module, the gas pressure inside the protective shell can be directly adjusted by temperature changes, further enhancing the detection accuracy of the fiber optic sensor pressure equalization device in high-temperature environments.

[0066] Optionally, Figure 6 A schematic diagram of another fiber optic sensor pressure equalization device provided in this embodiment of the present invention is shown below. Figure 6 As shown, the fiber optic sensor pressure equalization device also includes a demodulation module 70, the input of which is connected to the output of the detection fiber 102.

[0067] Specifically, the optical signal in the probe fiber 102 contains information about the measured physical quantity. The demodulation module 70 can extract, convert, and analyze the optical signal output from the probe fiber 102 to obtain accurate information about the measured physical quantity and obtain detection conclusions.

[0068] Optionally, the demodulation mode 70 includes a transmission fiber 701 and a demodulator 702; one end of the transmission fiber 701 is connected to the output end of the probe fiber 102, and the second end of the transmission fiber 701 is connected to the demodulator 702.

[0069] Specifically, refer to Figure 6 The probe fiber 102 outputs the modulated optical signal to the transmission fiber 701, which then transmits the optical signal to the demodulator 702. The transmission fiber 701 has advantages such as electromagnetic interference resistance, long-distance lossless transmission, and multi-parameter integration. The demodulator 702 is responsible for converting the optical signal into usable physical quantity data, performing signal analysis, and outputting the data. For example, the demodulator 702 can be a single integrated demodulator.

[0070] Optionally, Figure 7 A schematic diagram of another fiber optic sensor pressure equalization device provided in this embodiment of the present invention is shown below. Figure 7 As shown, the demodulator 702 includes a test light source 7021, an optical fiber circulator 7022, and an optical fiber spectrometer 7023; one end of the test light source 7021 is connected to the first end of the optical fiber circulator 7022, the second end of the optical fiber circulator 7022 is connected to the second end of the transmission optical fiber 701, and the third end of the optical fiber circulator 7022 is connected to the optical fiber spectrometer 7023.

[0071] Specifically, the fiber optic circulator 7022 has a fixed optical signal transmission direction, enabling directional transmission of the optical signal. The optical signal emitted by the test light source 7021 is input to the first end of the fiber optic circulator 7022 and output from the second end of the fiber optic circulator 7022 to the transmission fiber 701. The transmission fiber 701 further transmits the optical signal to the probe fiber 102, which converts the measured physical quantity into an optical signal modulation and transmits the modulated optical signal back to the transmission fiber 701. After passing through the transmission fiber 701, the signal returns to the second end of the fiber optic circulator 7022. The modulated optical signal received at the second end of the fiber optic circulator 7022 is output to the third end of the fiber optic circulator 7022. Finally, the modulated optical signal enters the fiber optic spectrometer 7023 for optical signal demodulation.

[0072] Optionally, such as Figure 6 and Figure 7 As shown, the fiber optic sensor pressure equalization device also includes a sealing module 80; the input end of the demodulation module 70 is connected to the output end of the detection fiber 102 within the sealing module 80, thereby achieving a tight connection between the detection module 10 and the demodulation module 70 and enhancing the accuracy of the detection results.

[0073] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. An optical fiber sensor air pressure equalization device, characterized by, Includes a detection module and a pressure regulation module; The detection module includes a protective housing, a detection optical fiber, and a protective gas; both the detection optical fiber and the protective gas are disposed inside the protective housing. The pressure regulating module includes a gas transmission channel, an automatic regulating switch, and a gas storage structure; one end of the gas transmission channel is connected to the protective shell, and the other end is connected to the gas storage structure; the automatic regulating switch is disposed in the gas transmission channel and is used to regulate the opening and closing of the gas passage between the protective shell and the gas storage structure.

2. The fiber optic sensor gas pressure equalization apparatus of claim 1, wherein, The automatic adjustment switch is a two-way regulating air valve; The bidirectional regulating valve is used to control the gas storage structure to output gas to the protective shell when the gas pressure inside the protective shell is less than a first preset pressure, and is also used to control the protective shell to output gas to the gas storage structure when the gas pressure inside the protective shell is greater than a second preset pressure; the second preset pressure is greater than or equal to the first preset pressure.

3. The fiber optic sensor gas pressure equalization apparatus of claim 1, wherein, The pressure regulation module includes a gas supply unit and a gas discharge unit; The gas replenishment unit includes a first gas transmission channel, a first one-way regulating valve, and a first gas storage structure. One end of the first gas transmission channel is connected to the protective shell, and the other end of the first gas transmission channel is connected to the first gas storage structure. The first one-way regulating valve is located in the first gas transmission channel and is used to regulate the opening and closing of the gas passage between the protective shell and the first gas storage structure so that the gas in the first gas storage structure enters the protective shell. The gas emission unit includes a second gas transmission channel, a second one-way regulating valve, and a second gas storage structure. One end of the second gas transmission channel is connected to the protective shell, and the other end of the second gas transmission channel is connected to the second gas storage structure. The second one-way regulating valve is located inside the second gas transmission channel and is used to regulate the opening and closing of the gas passage between the protective shell and the second gas storage structure, so that the gas inside the protective shell enters the second gas storage structure.

4. The fiber optic sensor gas pressure equalization apparatus of claim 1, wherein, The automatic adjustment switch includes a mechanical air valve structure.

5. The fiber optic sensor gas pressure equalization apparatus of claim 1, wherein, The automatic adjustment switch includes a first electromagnetic valve structure; The fiber optic sensor pressure equalization device further includes a pressure detection module and a first control module; the pressure detection module includes a pressure detection signal output terminal, the first control module includes a pressure detection signal receiving terminal and a first control signal output terminal, and the first electromagnetic valve structure includes a first control signal receiving terminal. The pressure detection signal output terminal is connected to the pressure detection signal receiving terminal, and the first control signal output terminal is connected to the first control signal receiving terminal; the first control module is used to determine the first control signal output by the first control signal output terminal based on the pressure signal received by the pressure detection signal receiving terminal in order to control the conduction state of the first solenoid valve structure.

6. The fiber optic sensor gas pressure equalization apparatus of claim 1, wherein, The automatic adjustment switch includes a second electromagnetic valve structure; The optical fiber sensor air pressure equalization device further comprises a temperature detection module and a second control module; the temperature detection module comprises a temperature detection signal output end, the second control module comprises a temperature detection signal receiving end and a second control signal output end, and the second electromagnetic air valve structure comprises a second control signal receiving end; The temperature detection signal output end is connected with the temperature detection signal receiving end, and the second control signal output end is connected with the second control signal receiving end; the second control module is used for determining the second control signal output by the second control signal output end according to the temperature signal received by the temperature detection signal receiving end, so as to control the conduction state of the second electromagnetic air valve structure.

7. The fiber optic sensor gas pressure equalization apparatus of claim 1, wherein, The optical fiber sensor air pressure equalization device further comprises a demodulation module, and an input end of the demodulation module is connected with an output end of the probe optical fiber.

8. The fiber optic sensor gas pressure equalization apparatus of claim 7, wherein, The demodulation module comprises a conducting optical fiber and a demodulator; One end of the conducting optical fiber is connected with the output end of the probe optical fiber, and a second end of the conducting optical fiber is connected with the demodulator.

9. The fiber optic sensor gas pressure equalization apparatus of claim 8, wherein, The demodulator comprises a test light source, an optical fiber circulator and an optical fiber spectrometer; One end of the test light source is connected with a first end of the optical fiber circulator, a second end of the optical fiber circulator is connected with the second end of the conducting optical fiber, and a third end of the optical fiber circulator is connected with the optical fiber spectrometer.

10. The fiber optic sensor gas pressure equalization apparatus of claim 7, wherein, The optical fiber sensor air pressure equalization device further comprises a sealing module; The input end of the demodulation module is connected with the output end of the probe optical fiber in the sealing module.

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