Calibration device of unmanned aerial vehicle optical fiber detection system

Abstract

The utility model discloses a calibration device for an optical fiber detection system of an unmanned aerial vehicle, which relates to the technical field of gas detection equipment and comprises a gas distribution box body, a gas dynamic dilution calibrator and an optical component, gas is injected into the gas distribution box body through the gas dynamic dilution calibrator, and the optical assembly comprises a light source generator, two optical probes and a gas concentration optical analyzer; one optical probe is connected with the light source generator through an optical fiber and used for emitting an optical signal, the optical signal penetrates through gas in the gas distribution box body to change, and the other optical probe is connected with the gas concentration optical analyzer through an optical fiber and used for receiving the changed optical signal; according to the utility model, the work of state inspection, signal measurement, calibration curve drawing and the like of a light source and a detection system can be completed in a gas environment with known concentration, and the accurate detection of an unknown pollution source gas sample is realized.

Description

Technical Field

[0001] This utility model relates to the field of gas detection equipment technology, and in particular to a calibration device for a UAV fiber optic detection system. Background Technology

[0002] The UAV fiber optic inspection system is a system that can greatly improve testing efficiency. It has many advantages such as simple operation, no risk, and good economic benefits. It is of great significance for innovating environmental monitoring models and improving environmental supervision and law enforcement capabilities.

[0003] In the process of using drones to conduct optical detection of pollution sources, it is necessary to analyze the optical signals emitted and received by the optical components and fiber optic system carried by the drone. The difference in the optical signals needs to be compared and calibrated with the corresponding pollutant concentration in order to obtain a calibration curve and then accurately test the unknown gas.

[0004] Accurate calibration and testing are essential equipment and steps for achieving the required accuracy of UAV fiber optic testing systems. However, there is no research on calibration devices in the current technology.

[0005] Therefore, there is an urgent need for a calibration device for UAV fiber optic testing systems. Utility Model Content

[0006] In view of the above, this utility model provides a calibration device for a UAV fiber optic testing system to solve the problems mentioned in the background art, and specifically discloses the following:

[0007] A calibration device for a UAV fiber optic testing system includes a gas distribution box, a gas dynamic dilution calibrator, and optical components.

[0008] Multiple jet heads are uniformly fixed on the top wall inside the gas distribution box. The inner diameter of the jet heads decreases from top to bottom. The gas dynamic dilution calibrator is located above the gas distribution box. The top of the jet head penetrates the top wall of the gas distribution box and is connected to the output end of the gas dynamic dilution calibrator through the gas distribution pipe.

[0009] A fixed shaft is fixedly installed at the center of the top wall inside the air distribution box. A mixing fan is rotatably connected to the bottom end of the fixed shaft. The jet head is tilted and used to blow the mixing fan.

[0010] The optical components include a light source generator, two optical probes, and a gas concentration optical analyzer. One of the optical probes is connected to the light source generator via an optical fiber and is used to emit an optical signal. The optical signal passes through the gas distribution box and changes the gas. The other optical probe is connected to the gas concentration optical analyzer via an optical fiber and is used to receive the changed optical signal.

[0011] Furthermore, the bottom wall inside the gas distribution box is provided with a mounting base for mounting the optical probe. The mounting end of the mounting base is provided with a clamping assembly for clamping the optical probe. The mounting base is hollow and is used to place the optical fiber. The light source generator and the gas concentration optical analyzer are both located below the gas distribution box.

[0012] Furthermore, an agitator is installed on the bottom wall inside the gas distribution box, and the agitator is electrically connected to an external motor.

[0013] Furthermore, the gas distribution box is provided with transmission windows on both the left and right side walls, and the transmission windows are made of quartz material;

[0014] It also includes a mounting bracket, which is a hollow pipe. The mounting bracket is located above the gas distribution box. Both ends of the mounting bracket are provided with bends. The mounting end of the bend is provided with a clamping component for clamping the optical probe. The optical probe is facing the transmission window.

[0015] The mounting frame has a converging section at the top center. The optical fibers connected to the two optical probes are placed inside the mounting frame and pass through the converging section to connect to the light source generator and the gas concentration optical analyzer, respectively.

[0016] Furthermore, partitions are hinged to both the left and right side walls of the gas distribution box, and the partitions are used to block the transmission window.

[0017] Furthermore, the clamping assembly includes two fixing blocks and a threaded post. The two fixing blocks are symmetrically arranged with the optical probe as the center. A rotating handle is fixedly provided at the end of the threaded post away from the optical probe. The end of the threaded post near the optical probe passes through the fixing block and is rotatably connected to a clamping block. A clamping pad is provided on the side of the clamping block near the optical probe. The clamping pad is used to clamp the optical probe. The threaded post is threadedly connected to the fixing block.

[0018] The beneficial effects of this utility model are as follows:

[0019] This invention can complete the status check of the light source and fiber optic detection system, signal measurement and calibration curve plotting in a gas environment with known concentration, so as to achieve accurate detection of gas samples from unknown pollution sources.

[0020] In this invention, the inner diameter of the jet head gradually decreases from top to bottom, which can increase the gas flow rate. The jet head is tilted to drive the mixing fan, so that the gas in the gas distribution box is mixed.

[0021] In this invention, the agitator at the bottom of the inner wall of the gas distribution box can further enable the gas in the gas distribution box to reach a completely mixed state in a shorter time.

[0022] The clamping component in this invention can clamp and fix optical probes of different models. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a calibration device for a UAV fiber optic testing system according to Embodiment 1 of the present invention.

[0025] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0026] Figure 3 This is a schematic diagram of the structure of a calibration device for a UAV fiber optic testing system according to Embodiment 2 of the present invention.

[0027] In the figure:

[0028] 1-Gas distribution box; 11-Transmission window; 2-Optical probe; 21-Fiber optic cable; 3-Fixed base; 4-Light source generator; 5-Gas concentration optical analyzer; 6-Agitator; 7-Gas dynamic dilution calibrator; 71-Gas distribution pipe; 72-Jet nozzle; 81-Fixed shaft; 82-Mixing fan; 9-Mounting bracket; 91-Gathering part; 92-Bending part; 101-Fixed block; 102-Threaded post; 1021-Rotating handle; 103-Clamping block; 104-Clamping pad. Detailed Implementation

[0029] The technical solutions in the embodiments of this utility model are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or components is not necessarily limited to those steps or components explicitly listed, but may include other steps or components not explicitly listed or inherent to such processes, methods, products, or devices.

[0031] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0032] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0033] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0034] Example 1:

[0035] See appendix Figure 1-2 A calibration device for a UAV fiber optic testing system includes a gas distribution box 1, a gas dynamic dilution calibrator 7, and optical components.

[0036] In this embodiment, the gas distribution box 1 is a small, sealed box with a known volume and optical path length, and is treated with an inert surface material. The bottom of the gas distribution box 1 is provided with a baffle that can be opened and closed. The gas dynamic dilution calibrator 7 is a conventional product of the prior art, which can configure different types and concentrations of gas into the gas distribution box 1 through a gas mixer as needed.

[0037] Multiple jet heads 72 are uniformly fixed on the top wall of the gas distribution box 1. The inner diameter of the jet head 72 decreases from top to bottom. The gas dynamic dilution calibrator 7 is located above the gas distribution box 1. The top of the jet head 72 penetrates the top wall of the gas distribution box 1 and is connected to the output end of the gas dynamic dilution calibrator 7 through the gas distribution pipe 71.

[0038] A fixed shaft 81 is fixedly provided at the center of the top wall inside the air distribution box 1. A mixing fan 82 is rotatably connected to the bottom end of the fixed shaft 81. The jet head 72 is tilted and used to blow the mixing fan 82.

[0039] In this embodiment, the inner diameter of the jet head 72 decreases from top to bottom, which can increase the gas flow rate. The mixing fan 82 is configured in conjunction with the jet head 72. The gas ejected from the jet head 72 can blow the side blades of the mixing fan 82, causing the mixing fan 82 to rotate and improving the gas mixing efficiency.

[0040] The optical components include a light source generator 4, two optical probes 2, and a gas concentration optical analyzer 5. One optical probe 2 is connected to the light source generator 4 via an optical fiber 21 to emit light signals. The light signals pass through the gas distribution box 1 and cause changes in the gas. The other optical probe 2 is connected to the gas concentration optical analyzer 5 via an optical fiber 21 to receive the changed light signals.

[0041] This embodiment can complete the status checks of the light source and fiber optic detection system, signal measurements, and calibration curve plotting in a gas environment with known concentrations, thereby achieving accurate detection of gas samples from unknown pollution sources.

[0042] The bottom wall inside the gas distribution box 1 is provided with a mounting base 3 for mounting the optical probe 2. The mounting end of the mounting base 3 is provided with a clamping component for clamping the optical probe 2. The mounting base 3 is hollow and is used to place the optical fiber 21. The light source generator 4 and the gas concentration optical analyzer 5 are all located below the gas distribution box 1.

[0043] In this embodiment, the clamping component can clamp and fix optical probes 2 of different models.

[0044] An agitator 6 is installed on the bottom wall inside the air distribution box 1, and the agitator 6 is electrically connected to an external motor.

[0045] In this embodiment, the agitator 6 at the bottom of the inner wall of the gas distribution box 1 can further enable the gas in the gas distribution box 1 to reach a completely mixed state in a shorter time. The external motor is the driving device and is not shown in the figure.

[0046] The clamping assembly includes two fixing blocks 101 and a threaded post 102. The two fixing blocks 101 are symmetrically arranged with the optical probe 2 as the center. The threaded post 102 is fixed with a rotating handle 1021 at the end away from the optical probe 2. The threaded post 102 passes through the fixing block 101 and is rotatably connected to a clamping block 103 at the end near the optical probe 2. The clamping block 103 is provided with a clamping pad 104 on the side near the optical probe 2. The clamping pad 104 is used to clamp the optical probe 2. The threaded post 102 is threadedly connected to the fixing block 101.

[0047] Working principle:

[0048] When in use, the optical probe 2 of the optical component is placed into the fixed seat 3 inside the gas distribution box 1, and the optical probe 2 is clamped and fixed by the clamping component.

[0049] Clean air (or nitrogen) filtered through activated carbon is pre-circulated into the gas distribution box 1, and the signal value at this point is used as the zero point value by the gas concentration optical analyzer 5. The gas dynamic dilution calibrator 7 introduces a standard gas (such as SO2) of known concentration and volume into the gas distribution box 1 through a gas mixer. Under the action of the agitator fan 6 and the mixing fan 82, the standard gas can achieve a complete mixture in a short time. At this time, the gas concentration optical analyzer 5 will detect the change in the optical signal. The optical signal value is then fitted with the concentration value of the standard gas (such as SO2) in the gas distribution box 1 to obtain the calibration point corresponding to the optical signal and the gas concentration value. The gas concentration optical analyzer 5 in this scheme is a commonly used product in the prior art.

[0050] This device can be used to dilute gas from high to low concentrations. The specific operation is as follows: a certain amount of gas is extracted from the chamber and replenished with an equal volume of clean gas to dilute and mix the gas in the gas distribution chamber 1, resulting in a gas of a different concentration. (For example, extracting half the original gas volume and replenishing with an equal volume of clean air will yield a gas with half the original concentration (excluding gas oxidation-reduction reactions)). The optical signal at this point is then fitted with the gas concentration to obtain the calibration point corresponding to the new concentration. This process is repeated until enough calibration points are obtained to create a calibration curve.

[0051] Under different gas concentrations, different types of light sources (UV, IR) can be used for testing. Furthermore, a water vapor generator can be set up to evaluate the changes in light signals caused by water vapor affecting different types of light sources, thereby realistically simulating or calibrating the optical system. Several different types of gases of known concentrations can also be simultaneously introduced and mixed to verify the anti-interference and detection capabilities of different types of light sources in mixed gas environments.

[0052] Because a dilution method is used, the optical signal returns to its initial value only when the concentration of the gas in the final gas distribution box 1 becomes zero. This method effectively detects and verifies the optical sensitivity of the testing system while avoiding errors in the actual test results caused by adsorption or residual contamination of the system due to high gas concentrations.

[0053] This device is used for calibration and comparison of testing systems. Due to its simple structure, it can be mounted on the same platform as optical testing systems for routine single-point calibration before the optical testing systems are put into testing operation. It can also periodically perform multi-point calibration curve plotting, offering high flexibility.

[0054] Example 2:

[0055] See appendix Figure 3 A calibration device for a UAV fiber optic testing system includes a gas distribution box 1, a gas dynamic dilution calibrator 7, and optical components.

[0056] In this embodiment, the gas distribution box 1 is a small, sealed box with a known volume and optical path length, and is treated with an inert surface material. The bottom of the gas distribution box 1 is provided with a baffle that can be opened and closed. The gas dynamic dilution calibrator 7 is a conventional product of the prior art, which can configure different types and concentrations of gas into the gas distribution box 1 through a gas mixer as needed.

[0057] Multiple jet heads 72 are uniformly fixed on the top wall of the gas distribution box 1. The inner diameter of the jet head 72 decreases from top to bottom. The gas dynamic dilution calibrator 7 is located above the gas distribution box 1. The top of the jet head 72 penetrates the top wall of the gas distribution box 1 and is connected to the output end of the gas dynamic dilution calibrator 7 through the gas distribution pipe 71.

[0058] A fixed shaft 81 is fixedly provided at the center of the top wall inside the air distribution box 1. A mixing fan 82 is rotatably connected to the bottom end of the fixed shaft 81. The jet head 72 is tilted and used to blow the mixing fan 82.

[0059] In this embodiment, the inner diameter of the jet head 72 decreases from top to bottom, which can increase the gas flow rate. The mixing fan 82 is configured in conjunction with the jet head 72. The gas ejected from the jet head 72 can blow the side blades of the mixing fan 82, causing the mixing fan 82 to rotate and improving the gas mixing efficiency.

[0060] The optical components include a light source generator 4, two optical probes 2, and a gas concentration optical analyzer 5. One optical probe 2 is connected to the light source generator 4 via an optical fiber 21 to emit light signals. The light signals pass through the gas distribution box 1 and cause changes in the gas. The other optical probe 2 is connected to the gas concentration optical analyzer 5 via an optical fiber 21 to receive the changed light signals.

[0061] This embodiment can complete the status checks of the light source and fiber optic detection system, signal measurements, and calibration curve plotting in a gas environment with known concentrations, thereby achieving accurate detection of gas samples from unknown pollution sources.

[0062] An agitator 6 is installed on the bottom wall inside the air distribution box 1, and the agitator 6 is electrically connected to an external motor.

[0063] In this embodiment, the agitator 6 at the bottom of the inner wall of the gas distribution box 1 can further enable the gas in the gas distribution box 1 to reach a completely mixed state in a shorter time. The external motor is the driving device and is not shown in the figure.

[0064] The gas distribution box 1 is provided with a transmission window 11 (not shown in the figure) on both the left and right side walls. The transmission window 11 is made of quartz material.

[0065] It also includes a mounting bracket 9, which is a hollow pipe. The mounting bracket 9 is located above the gas distribution box 1. Both ends of the mounting bracket 9 are provided with bending portions 92. The mounting end of the bending portion 92 is provided with a clamping component for clamping the optical probe 2. The optical probe 2 faces the transmission window 11.

[0066] The mounting bracket 9 has a collection section 91 at the top center. The optical fibers 21 connected to the two optical probes 2 are placed inside the mounting bracket 9 and pass through the collection section 91 to the mounting bracket 9 and are connected to the light source generator 4 and the gas concentration optical analyzer 5 respectively.

[0067] In this embodiment, the clamping component can clamp and fix optical probes 2 of different models.

[0068] The left and right side walls of the gas distribution box 1 are hinged with partitions, which are used to block the transmission window 11.

[0069] The clamping assembly includes two fixing blocks 101 and a threaded post 102. The two fixing blocks 101 are symmetrically arranged with the optical probe 2 as the center. The threaded post 102 is fixed with a rotating handle 1021 at the end away from the optical probe 2. The threaded post 102 passes through the fixing block 101 and is rotatably connected to a clamping block 103 at the end near the optical probe 2. The clamping block 103 is provided with a clamping pad 104 on the side near the optical probe 2. The clamping pad 104 is used to clamp the optical probe 2. The threaded post 102 is threadedly connected to the fixing block 101.

[0070] Working principle:

[0071] In use, the optical probe 2 of the optical component is mounted on the bent part 92, and the optical probe 2 is clamped and fixed by the clamping component.

[0072] Clean air (or nitrogen) filtered through activated carbon is pre-circulated into the gas distribution box 1, and the signal value at this point is used as the zero point value by the gas concentration optical analyzer 5. The gas dynamic dilution calibrator 7 introduces a standard gas (such as SO2) of known concentration and volume into the gas distribution box 1 through a gas mixer. Under the action of the agitator fan 6 and the mixing fan 82, the standard gas can achieve a complete mixture in a short time. At this time, the gas concentration optical analyzer 5 will detect the change in the optical signal. The optical signal value is then fitted with the concentration value of the standard gas (such as SO2) in the gas distribution box 1 to obtain the calibration point corresponding to the optical signal and the gas concentration value. The gas concentration optical analyzer 5 in this scheme is a commonly used product in the prior art.

[0073] The calibration curve is constructed by using the concentration of a known gas as the X-value and the measured light signal value at that concentration as the Y-value, with the two values ​​forming a point on the XY-axis coordinate system. Several points with different concentrations and corresponding light signals are obtained, and the curve is formed by connecting these points. When testing samples of unknown concentration, the equipment compares the obtained light signal with this curve to determine the corresponding test value for the gas.

[0074] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A calibration device for an unmanned aerial vehicle (UAV) fiber optic testing system, characterized in that, It comprises a gas distribution box (1), a gas dynamic dilution calibrator (7) and an optical assembly; A plurality of gas injection heads (72) are uniformly arranged on the inner top wall of the gas distribution box (1), the inner diameters of the gas injection heads (72) gradually decrease from top to bottom, the gas dynamic dilution calibrator (7) is located above the gas distribution box (1), the top ends of the gas injection heads (72) penetrate the top wall of the gas distribution box (1) and are connected with the output end of the gas dynamic dilution calibrator (7) through a gas distribution pipe (71); A fixed shaft (81) is fixedly arranged on the center of the inner top wall of the gas distribution box (1), and a mixing fan (82) is rotatably connected to the bottom end of the fixed shaft (81), the gas injection heads (72) are arranged obliquely and used for blowing the mixing fan (82). The optical assembly comprises a light source generator (4), two optical probes (2) and a gas concentration optical analyzer (5), one of the optical probes (2) is connected with the light source generator (4) through an optical fiber (21) and used for emitting a light signal, the light signal changes when passing through the gas in the gas distribution box (1), and the other optical probe (2) is connected with the gas concentration optical analyzer (5) through an optical fiber (21) and used for receiving the changed light signal.

2. The calibration device of the unmanned aerial vehicle optical fiber detection system according to claim 1, wherein, A fixing seat (3) for mounting the optical probes (2) is arranged on the inner bottom wall of the gas distribution box (1), a clamping assembly is arranged on the mounting end of the fixing seat (3) and used for clamping the optical probes (2), the fixing seat (3) is hollow and used for placing the optical fibers (21), and the light source generator (4) and the gas concentration optical analyzer (5) are arranged below the gas distribution box (1).

3. The calibration device of the unmanned aerial vehicle optical fiber detection system according to claim 1, wherein, An agitating fan (6) is mounted on the inner bottom wall of the gas distribution box (1) and electrically connected with an external motor.

4. The calibration device of claim 1, wherein, Transmission windows (11) are arranged on the left and right side walls of the gas distribution box (1), and the transmission windows (11) are made of quartz material; An installation rack (9) is further arranged above the gas distribution box (1), the installation rack (9) is a hollow pipe, bending portions (92) are arranged on the two ends of the installation rack (9), clamping assemblies are arranged on the mounting ends of the bending portions (92) and used for clamping the optical probes (2), and the optical probes (2) face the transmission windows (11); A collecting portion (91) is arranged on the top of the installation rack (9), the optical fibers (21) connected with the two optical probes (2) are arranged in the installation rack (9) and pass through the installation rack (9) through the collecting portion (91) and are connected with the light source generator (4) and the gas concentration optical analyzer (5) respectively.

5. The calibration device of claim 4, wherein, A partition plate is hingedly connected to the left and right side walls of the gas distribution box (1) and used for shielding the transmission windows (11).

6. The calibration device of the unmanned aerial vehicle optical fiber detection system according to claim 2 or 4, characterized in that, The clamping assembly comprises two fixed blocks (101) and a threaded column (102), the two fixed blocks (101) are symmetrically arranged with the optical probe (2) as the center, one end of the threaded column (102) away from the optical probe (2) is fixedly provided with a rotating handle (1021), one end of the threaded column (102) close to the optical probe (2) penetrates the fixed block (101) and is rotationally connected with a clamping block (103), one side of the clamping block (103) close to the optical probe (2) is provided with a clamping pad (104), the clamping pad (104) is used for clamping the optical probe (2), and the threaded column (102) is in threaded connection with the fixed block (101).

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