Reusable fluorescent probe with temperature compensation and oxygen partial pressure detection system

Abstract

The utility model belongs to the field of oxygen sensors, and particularly relates to a reusable fluorescent probe with temperature compensation and an oxygen partial pressure detection system. The fluorescent probe comprises a carrier, a temperature sensor and a fluorescent material film. The carrier comprises a shell and a cover body which are detachably connected. The shell is composed of a disc-shaped bottom plate and a cylindrical shell wall. A groove, an air hole and a mounting hole are formed in the bottom plate; and internal threads are arranged on the inner wall of the shell wall. The cover body comprises a disc-shaped cover plate with a through hole in the center and a tubular optical fiber interface on the cover plate. And external threads are arranged on the periphery of the cover plate. After the carrier is assembled, a cavity is formed in the carrier. And the optical fiber interface is communicated with the cavity in the shell through the through hole in the cover plate. The temperature sensor is installed in a groove in the bottom plate in an embedded mode. And the fluorescent material film is arranged in the cavity of the carrier. According to the scheme, the problems that the temperature compensation effect of a fluorescent probe in an existing optical fiber oxygen sensor is poor and the use cost is high are solved.

Description

Technical Field

[0001] The utility model belongs to the field of oxygen sensors, and in particular relates to a reusable fluorescence probe with temperature compensation, and a corresponding single-photon fluorescence quenching oxygen partial pressure detection system. Background Art

[0002] Oxygen sensors are an important type of gas sensor, which can be used in oxygen safety working state control systems such as deoxygenation of aviation fuel, gas leakage detection of high-altitude early warning platforms, as well as life support systems of manned spacecraft, space stations, various types of submarines, and advanced fighters. They can also be used in civil aviation, large aircraft and large ships. According to different measurement principles, oxygen sensors mainly include thermal magnetic oxygen sensors, electrochemical oxygen sensors, zirconia ceramic oxygen sensors, tunable laser oxygen sensors and frequency detection oxygen sensors.

[0003] The single-photon fluorescence quenching oxygen sensor is a new type of instrument that measures oxygen partial pressure or oxygen concentration based on the principle of fluorescence quenching. The fluorescence quenching process of the fluorescent material in the sensor will be affected by the oxygen partial pressure in the environment. Therefore, the sensor excites the fluorescent material through a laser to produce a fluorescence reaction, and analyzes the oxygen partial pressure in the current environment based on the signal changes during the fluorescence quenching process. In addition, the fluorescence quenching process of the fluorescent material will also be affected by the ambient temperature. The drastic change in ambient temperature will affect the measurement accuracy. The prior art simultaneously sets a fluorescent probe and a temperature sensor in the detection environment, and performs temperature compensation on the detection signal of the fluorescent probe according to the detection result of the temperature sensor to improve the accuracy of the detection result. However, since the temperature detected by the existing temperature sensor is usually the ambient temperature or the medium temperature, rather than the temperature of the fluorescent material, the result of the temperature compensation is not accurate. In addition, most of the existing fluorescent probes are disposable probes, and the cost of use is relatively high. Utility Model Content

[0004] In order to solve the problems of poor temperature compensation effect and high use cost of existing fluorescent probes, the utility model provides a reusable fluorescent probe with temperature compensation.

[0005] The product provided by the utility model is realized through the following technical solutions:

[0006] A reusable fluorescence probe with temperature compensation is used as a detection probe of a single-photon fluorescence quenching sensor. The fluorescence probe comprises a carrier, a temperature sensor and a fluorescent material film.

[0007] The carrier includes a detachably connected shell and a cover. The shell is composed of a disc-shaped bottom plate and a cylindrical shell wall concentrically arranged on the bottom plate. The diameter of the bottom plate is larger than the diameter of the shell wall; a groove is provided on the side of the center of the bottom plate close to the shell wall. The shell also includes a cable channel leading from the groove to the outside of the shell. A plurality of penetrating air holes are evenly arranged in the area around the bottom plate corresponding to the groove; the air holes are located within the inner diameter range of the shell wall. An internal thread is provided on the inner wall of the shell wall.

[0008] The cover body includes a disc-shaped cover plate with a through hole in the center, and a tubular optical fiber interface vertically connected to the cover plate. The outer diameter of the cover plate matches the inner diameter of the shell wall, and a corresponding external thread is provided on the outer circumference of the cover plate. The cover plate is screwed into the shell through the thread to realize the assembly of the cover body and the shell. After the two are assembled, a cylindrical height-adjustable cavity is formed in the carrier. The optical fiber interface is connected to the cavity inside the shell through the through hole in the cover plate.

[0009] The temperature sensor is embedded in the groove of the bottom plate. The fluorescent material film is installed in the cavity of the carrier; one side of the fluorescent material film is attached to the temperature sensor and connected to the outside through the air hole; the other side receives the pulse laser as an excitation signal through the optical fiber interface.

[0010] As a further improvement of the utility model, the air holes in the bottom plate are inclined holes.

[0011] and / or

[0012] The annular region in the bottom plate that extends beyond the shell wall also includes a plurality of evenly arranged mounting holes.

[0013] As a further improvement of the utility model, the cable channel is buried in the bottom plate and the shell wall, and is connected to the outside of the shell along the side shell wall. The cable of the temperature sensor passes through the cable channel in the shell and is electrically connected to the signal receiving device.

[0014] As a further improvement of the present invention, the thickness of the temperature sensor matches the depth of the groove in the bottom plate, so that after the temperature sensor is assembled, its upper surface is flush with the bottom plate.

[0015] As a further improvement of the present invention, the carrier is made of copper or other metal or non-metal material having a thermal conductivity close to that of metallic copper.

[0016] and / or

[0017] The shell and the cover are made of the same material and are integrally formed.

[0018] As a further improvement of the utility model, the reusable fluorescence probe with temperature compensation further comprises an end cap, and the end cap is used to seal the part with internal threads exposed in the shell after the assembly is completed.

[0019] As a further improvement of the utility model, the end cap is in the shape of a double-layer cylindrical boss, the diameter of the bottom thereof is the same as the outer diameter of the shell wall, and the diameter of the top boss matches the outer diameter of the shell; the center of the end cap also includes a through hole that matches the shape and size of the optical fiber interface. The smaller part of the end cap is inserted into the part with internal threads in the shell, and the optical fiber interface passes through the through hole in the end cap.

[0020] As a further improvement of the utility model, the end cap is a flexible end cap made of rubber, silicone or resin material.

[0021] As a further improvement of the present invention, a plurality of outwardly protruding blocks are provided on the outer side of the bottom plate, and the blocks are used to prevent the air holes on the bottom plate from being blocked when the bottom plate is installed on any substrate.

[0022] The utility model also comprises a single-photon fluorescence quenching oxygen partial pressure detection system, which adopts the aforementioned reusable fluorescence probe with temperature compensation as the detection probe of the sensor.

[0023] The technical solution provided by the utility model has the following beneficial effects:

[0024] The utility model designs a reusable fluorescent probe with temperature compensation, which assembles fluorescent material and temperature sensor in a detachable copper carrier, and the shell and cover in the carrier are detachably threaded. On the one hand, the carrier provides a "dark room" for the fluorescent material to observe the fluorescence quenching reaction of the fluorescent material and allows the fluorescent material therein to contact the gas environment outside the carrier, and on the other hand, provides a stable and uniform temperature environment for the fluorescent material and the temperature sensor therein.

[0025] In the solution of the utility model, the fluorescent probe directly contacts the temperature sensor with the fluorescent material and keeps the ambient temperature of the fluorescent material stable, so that the reaction temperature of the fluorescent material can be measured more accurately, ensuring that the temperature compensation of the sensor is more accurate, thereby improving the detection accuracy of the oxygen partial pressure. In addition, the fluorescent material film in the carrier of the utility model can be replaced, thereby realizing the reuse of the fluorescent probe, which reduces the use cost of the oxygen partial pressure detector. Based on the above advantages, the reusable fluorescent probe with temperature compensation provided in this embodiment is highly practical and suitable for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0027] Figure 1This is a sectional view of the reusable fluorescence probe with temperature compensation provided in Embodiment 1 of the present utility model.

[0028] Figure 2 This is an assembly drawing of the reusable fluorescence probe with temperature compensation provided in Embodiment 1 of the present utility model.

[0029] Figure 3 This is an exploded view of the structure of the reusable fluorescence probe with temperature compensation provided in Embodiment 1 of the present utility model.

[0030] Figure 4 This is a schematic diagram of the structure of the back side of the bottom plate in the reusable fluorescence probe with temperature compensation.

[0031] Figure 5 This is an assembly drawing of the fluorescence probe with an end cap provided in Embodiment 1 of the present utility model.

[0032] Figure 6 This is an exploded view of the structure of the fluorescence probe with an end cap provided in Embodiment 1 of the present utility model.

[0033] Figure 7 This is a system architecture diagram of the single-photon fluorescence quenching oxygen partial pressure detection system provided in Embodiment 2 of the present utility model.

[0034] The markings in the figure are: 1, housing; 2, cover body; 3, temperature sensor; 4, fluorescence material film; 5, end cap; 10, internal thread; 11, bottom plate; 12, housing wall; 20, external thread; 21, cover plate; 22, optical fiber interface; 111, groove; 112, ventilation hole; 113, mounting hole. Detailed implementation manners

[0035] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0036] Embodiment 1

[0037] This embodiment provides a reusable fluorescence probe with temperature compensation, which is used as a detection probe of a single-photon fluorescence quenching sensor. As Figure 1 shown, the fluorescence probe includes a carrier, a temperature sensor 3 and a fluorescence material film 4.

[0038] Among them, as Figure 2As shown, the carrier includes a detachably connected shell 1 and a cover 2. The shell 1 and the cover 2 are preferably made of the same material and are integrally formed. The shell 1 in this embodiment is composed of a disc-shaped bottom plate 11 and a cylindrical shell wall 12 concentrically arranged on the bottom plate 11. An internal thread 10 is arranged on the inner wall of the shell wall 12. The diameter of the bottom plate 11 is larger than the diameter of the shell wall 12; Figure 1 It can be seen that a groove 111 is provided at one side of the center of the bottom plate 11 close to the shell wall 12. The shell 1 also includes a cable channel leading from the groove 111 to the outside of the shell 1. Figure 4 As shown, a plurality of penetrating air holes 112 are evenly arranged in the area around the corresponding groove 111 in the bottom plate 11; the air holes 112 are located within the inner diameter range of the shell wall 12. In particular, the air holes 112 in this embodiment are inclined holes extending obliquely.

[0039] like Figure 3 As shown, the cover body 2 includes a disc-shaped cover plate 21 with a through hole in the center, and a tubular optical fiber interface 22 vertically connected to the cover plate 21. The outer diameter of the cover plate 21 matches the inner diameter of the shell wall 12, and a corresponding external thread 20 is provided on the outer periphery of the cover plate 21. Figure 1 As shown, the cover plate 21 is screwed into the housing 1 by threads to realize the assembly of the cover body 2 and the housing 1. After the two are assembled, a cylindrical height-adjustable cavity is formed in the carrier. The optical fiber interface 22 is connected to the cavity inside the housing 1 through the through hole in the cover plate 21.

[0040] In this embodiment, the temperature sensor 3 preferably adopts a patch-type temperature sensor 3, and the thickness of the temperature sensor 3 matches the depth of the groove 111 in the bottom plate 11. The temperature sensor 3 is embedded in the groove 111 in the bottom plate 11, and after the temperature sensor 3 is assembled, its upper surface is flush with the bottom plate 11. The cable channel is buried in the bottom plate 11 and the shell wall 12, and is connected to the outside of the shell 1 along the side shell wall 12. In this embodiment, the cable of the temperature sensor 3 passes through the cable channel in the shell 1 and is electrically connected to the external signal receiving device.

[0041] The fluorescent material film 4 in this embodiment adopts a circular thin sheet that matches the inner cavity interface of the carrier and is installed in the cavity of the carrier. In the assembly process of the reusable fluorescent probe with temperature compensation provided in this embodiment, the technician first unscrews the shell 1 and the cover 2, and then puts the fluorescent material film 4 into the inner cavity, and gradually shrinks the cavity in the carrier by screwing the cover 2, and finally compresses the fluorescent material film 4 therein. In this state, one side of the fluorescent material film 4 is in contact with the temperature sensor 3, and is connected to the outside world through the air vent 112 on the bottom plate 11. The other side receives the pulsed laser as an excitation signal through the optical fiber interface 22. Finally, the technician connects the optical fiber interface 22 to the laser light source and signal receiving device at the rear end through the Y-type optical fiber, and electrically connects the interface of the temperature sensor 3 to the data processing model at the rear end.

[0042] In the actual application process of the reusable fluorescent probe with temperature compensation provided in this embodiment, the laser light source transmits a pulse signal to the fluorescent material film 4 in the inner cavity through the optical fiber interface 22 to stimulate the fluorescent material to produce a fluorescent reaction, and the echo signal enters the signal receiving device at the rear end through the optical fiber interface 22 to complete the subsequent oxygen partial pressure detection. In the scheme of this embodiment, the air holes 112 on the bottom plate 11 can expose part of the fluorescent material film 4, so that the fluorescent material film 4 is in contact with the oxygen in the environment to be tested. At the same time, in this embodiment, the air holes 112 are opened on the reverse side of the optical fiber interface 22, and the fluorescent material film 4 can also be used to block the light in the environment to prevent the interference light signal from reaching the side of the optical fiber interface 22.

[0043] In addition, in this embodiment, the air holes 112 on the bottom plate 11 are set as oblique holes to prevent external ambient light from entering the inner cavity of the carrier as much as possible. If the process allows, in order to further improve the ventilation and light shielding effects of the air holes 112, the air holes 112 can also be designed as a more curved and complex channel structure.

[0044] In the solution of this embodiment, the data measured by the temperature sensor 3 is mainly used to calibrate the quenching function in the data processing stage, so as to realize dynamic compensation of the oxygen partial pressure measurement result according to the different ambient temperatures. Since the temperature sensor 3 in the fluorescent probe of this embodiment is in direct contact with the fluorescent material film 4, the temperature data measured by the temperature sensor 3 is closer to the temperature of the fluorescent material itself.

[0045] In addition, in a preferred solution of this embodiment, the carrier is made of copper material. In other embodiments, the shell 1 and cover 2 in the carrier can also be made of other metal or non-metal materials with a thermal conductivity close to that of metal copper. The reason why this embodiment uses a material with a high thermal conductivity to prepare the carrier is to keep the temperature of the fluorescent material film 4 in the inner cavity relatively uniform and stable. Combined with the structure of the fluorescent probe in this embodiment, it can be seen that the temperature sensor 3 and the fluorescent material film 4 in this embodiment are completely wrapped in the copper carrier. Therefore, even if the temperature of the external environment fluctuates violently locally, the temperature of the temperature sensor 3 and the fluorescent material film 4 in the inner cavity can also be kept roughly uniform and hot through the heat conduction of the copper carrier. That is, the copper carrier in this embodiment can resist external thermal shock.

[0046] The fluorescent material film 4 in the fluorescent probe is a consumable with a limited service life. The fluorescent probe provided in this embodiment adopts a detachable connection structure design for the shell 1 and the cover 2 in the carrier, so that technicians can remove the shell 1 and the cover 2 and replace the fluorescent material film 4 in the inner cavity when the fluorescent film material reaches the maximum service life. Finally, a "new" fluorescent probe can be obtained by reassembling the fluorescent material. This reusable design greatly improves the service life of the fluorescent probe in this embodiment and reduces the cost of using the probe to monitor oxygen partial pressure.

[0047] In actual application, the fluorescent probe of this embodiment is usually fixedly installed in the environment to be tested. For example, when the fluorescent probe is used to monitor the oxygen partial pressure of the aircraft fuel tank, the fluorescent probe needs to be installed on the top of the inner wall of the mailbox. In order to better install the fluorescent probe, this embodiment also includes a plurality of evenly arranged mounting holes 113 in the annular area of ​​the bottom plate 11 that exceeds the shell wall 12. The technician can use fasteners such as screws and bolts to fix the fluorescent probe on a specific base surface through the mounting hole 113.

[0048] In addition, it should be noted that the vent holes 112 of the carrier in this embodiment are arranged on the outward side of the bottom plate 11, so when the fluorescent probe is fixedly installed, the bottom plate 11 should not be directly and tightly fitted with the flat base surface, but a gap should be kept between the two to avoid blocking the vent holes 112. In order to further overcome this defect, the fluorescent probe of this embodiment is also provided with a plurality of outwardly protruding blocks on the outer side of the bottom plate 11, and the blocks prevent the bottom plate 11 from fitting with the base surface to be installed, thereby preventing the vent holes 112 in the bottom plate 11 from being blocked when the fluorescent probe is installed.

[0049] Considering that the fluorescent probes in this embodiment are mostly used in humid or even harsh environments with corrosive gases, in order to prevent the threaded section of the carrier part of the fluorescent probe from being oxidized and corroded, thereby causing the shell 1 and the cover 2 to be unable to be opened. Figure 5 As shown, the reusable fluorescence probe with temperature compensation provided in this embodiment also includes an end cap 5, which is used to seal the portion with internal thread 10 exposed in the housing 1 after assembly. In the scheme of this embodiment, the end cap 5 is a flexible end cap 5 made of rubber, silicone or resin material. In other embodiments, the end cap 5 can also be a plastic plug with external thread 20.

[0050] Specifically, Figure 6 As shown, the end cap 5 in this embodiment is in the shape of a double-layer cylindrical boss, the diameter of the bottom thereof is the same as the outer diameter of the shell wall 12, and the diameter of the top boss matches the outer diameter of the shell 1. The center of the end cap 5 also includes a through hole that matches the shape and size of the optical fiber interface 22. The smaller portion of the end cap 5 is inserted into the portion of the shell 1 with the internal thread 10, and the optical fiber interface 22 passes through the through hole in the end cap 5.

[0051] Example 2

[0052] Based on the solution of Example 1, this example further provides a single-photon fluorescence quenching oxygen partial pressure detection system, which uses the temperature-compensated reusable fluorescence probe of Example 1 as the detection probe of the sensor. Figure 7 As shown, the single-photon fluorescence quenching oxygen partial pressure detection system also includes a power supply, a Y-shaped optical fiber, a laser, a single-photon detector, a filter, a single-photon acquisition card and a main controller.

[0053] The power supply is used to power the entire detection system. The laser is connected to the optical fiber interface 22 in the fluorescent probe through a Y-shaped optical fiber, and is used to generate and emit a periodic pulse laser signal according to a preset emission frequency. The laser controller is electrically connected to the laser, and the laser controller is used to send a drive signal to the laser according to the received start instruction, and adjust the emission frequency and pulse intensity of the laser.

[0054] The silicon single-photon detector is also connected to the optical fiber interface 22 of the fluorescent probe through a Y-shaped optical fiber. The single-photon detector is used to measure the number of photons of the received optical signal. The filter is connected between the optical Y-shaped optical fiber and the single-photon detector; the filter is used to filter out the optical signal of the wavelength band of the pulsed laser generated by the laser from the echo signal entering the single-photon detector. The single-photon acquisition card is electrically connected to the single-photon detector; the single-photon acquisition card is used to record the number of photons measured by the single-photon detector according to a preset sampling period when a start instruction is received.

[0055] The main controller is electrically connected to the laser controller and the single-photon acquisition card; the main controller is the control center and data processing center in the light source and detection module provided in this embodiment. On the one hand, the main controller is used to synchronously send the startup instructions required for operation to the laser controller and the single-photon acquisition card. Among them, the startup instructions sent by the main controller to the laser controller include the emission frequency, emission time and laser power of the laser, etc. The startup instructions sent by the main controller to the single-photon acquisition card include the sampling frequency and sampling time of the signal, etc.

[0056] In the complete detection system, the emission time of the laser is the same as the sampling time of the single-photon acquisition card, so as to receive the response while stimulating the fluorescent probe. On the other hand, the main controller user obtains the detection result of the number of photons collected by the single-photon acquisition card, and then obtains the corresponding oxygen partial pressure of the space to be tested based on the detection data analysis. In practical applications, the main controller can use embedded chips including FPGA, or other processor chips based on RISC-V, ARM, x86 and other architectures.

[0057] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A reusable fluorescence probe with temperature compensation, which is used as a detection probe of a single-photon fluorescence quenching sensor, characterized in that: It includes: A carrier, comprising a detachably connected shell and a cover body; the shell is composed of a disc-shaped bottom plate and a cylindrical shell wall concentrically arranged on the bottom plate; the diameter of the bottom plate is larger than the diameter of the shell wall; a groove is provided on the central side of the bottom plate close to the shell wall; the shell also includes a cable channel leading from the groove to the outside of the shell; a plurality of penetrating air holes are evenly arranged in the area around the corresponding groove in the bottom plate, and the air holes are located within the inner diameter range of the shell wall; an internal thread is arranged on the inner wall of the shell wall; the cover body comprises a disc-shaped cover plate with a through hole in the center, and a tubular optical fiber interface vertically connected to the cover plate; the outer diameter of the cover plate matches the inner diameter of the shell wall, and a corresponding external thread is provided on the outer periphery of the cover plate; after the shell and the cover plate are assembled, a cylindrical height-adjustable cavity is formed in the carrier; the optical fiber interface is connected to the cavity inside the shell through the through hole in the cover plate; A temperature sensor is embedded in a groove in the bottom plate; A fluorescent material film is installed in the cavity of the carrier; one side of the fluorescent material film is attached to the temperature sensor and is connected to the outside through the air hole; The other side receives pulsed laser as an excitation signal through the optical fiber interface.

2. The reusable fluorescence probe with temperature compensation as claimed in claim 1, characterized in that: The ventilation holes in the bottom plate are inclined holes; and / or The bottom plate further includes a plurality of evenly arranged mounting holes in an annular region extending beyond the shell wall.

3. The reusable fluorescence probe with temperature compensation as claimed in claim 1, characterized in that: The cable channel is buried in the bottom plate and the shell wall, and is connected to the outside of the shell along the side shell wall; the cable of the temperature sensor passes through the cable channel in the shell and is electrically connected to the signal receiving device.

4. The reusable fluorescence probe with temperature compensation as claimed in claim 1, characterized in that: The thickness of the temperature sensor matches the depth of the groove in the bottom plate, so that after the temperature sensor is assembled, its upper surface is flush with the bottom plate.

5. The reusable fluorescence probe with temperature compensation as claimed in claim 1, characterized in that: The carrier is made of copper or other metal or non-metal material with a thermal conductivity close to that of metallic copper; and / or The shell and the cover are both made of the same material and are integrally formed structural parts.

6. The reusable fluorescence probe with temperature compensation as claimed in claim 1, characterized in that: It also includes an end cap, which is used to seal the part with internal threads exposed in the shell after the assembly is completed.

7. The reusable fluorescence probe with temperature compensation as claimed in claim 6, characterized in that: The end cap is in the shape of a double-layer cylindrical boss, the diameter of the bottom of which is the same as the outer diameter of the shell wall, and the diameter of the top boss matches the outer diameter of the shell; the center of the end cap also includes a through hole that matches the shape and size of the optical fiber interface.

8. The reusable fluorescence probe with temperature compensation as claimed in claim 7, characterized in that: The end cap is a flexible end cap made of rubber, silicone or resin material.

9. The reusable fluorescence probe with temperature compensation as claimed in claim 1, characterized in that: A plurality of outwardly protruding stoppers are also provided on the outer side of the bottom plate, and the stoppers are used to prevent the air holes on the bottom plate from being blocked when the bottom plate is installed on any substrate.

10. A single-photon fluorescence quenching oxygen partial pressure detection system, characterized in that: The method adopts the reusable fluorescent probe with temperature compensation as described in any one of claims 1 to 9 as the detection probe of the sensor.

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