Novel sensor for monitoring trace water content in aviation fuel on line

Abstract

The utility model belongs to the technical field of trace water detection, and particularly relates to a novel sensor for monitoring trace water content in aviation fuel on line, which comprises an original element module, a signal processing module and a mechanical shell, the diameter of the top of the probe is consistent with the diameter of the mechanical shell, the probe is fixedly arranged at the bottom of the mechanical shell, a PD mounting frame and a light source mounting frame fixedly arranged on the PD mounting frame are fixedly arranged in the probe, a light source adjusting frame and a disc spring arranged on the light source adjusting frame are fixedly arranged on the light source mounting frame, and the disc spring is fixedly arranged on the light source adjusting frame. A spectroscope and a cross-shaped groove which is arranged in the PD mounting rack and is used for accommodating the spectroscope are pasted in the PD mounting rack. The optical sensor is simple in structure, is mounted in a pipeline system and inserted into fuel, can continuously analyze the trace water content of the flowing fuel, does not depend on chemical detection of periodic representative samples, and is convenient for people to use.

Description

Technical Field

[0001] This utility model relates to the field of trace water detection technology, and in particular to a novel online sensor for monitoring trace water content in aviation fuel. Background Technology

[0002] Currently, the detection of trace water content in aviation fuel both domestically and internationally mainly relies on chemical and visual methods, lacking high-precision online detection equipment. Developing an online sensor for detecting trace water content in aviation fuel based on the principle of laser scattering has significant engineering application value. During production, storage, and transportation, aviation fuel inevitably comes into contact with humid air, storage containers, and transport pipelines, thus becoming contaminated with water. Due to the hygroscopic properties of aviation fuel, water droplets exceeding their solubility limit will form free water within the fuel.

[0003] In the existing technology, because the entire fuel supply chain from the refinery to the fuel tank cannot quickly detect free water, free water formed in aviation fuel can easily damage the engine, resulting in low safety. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies, such as the inability to quickly detect free water throughout the entire fuel supply chain from the refinery to the fuel tank, which can easily lead to damage to the engine and low safety due to free water forming in aviation fuel. Therefore, a novel online sensor for monitoring trace water content in aviation fuel is proposed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A novel online sensor for monitoring trace water content in aviation fuel includes an element module and a signal processing module, and also includes:

[0007] Mechanical casing;

[0008] The probe has a top diameter that matches the diameter of the mechanical housing and is fixed to the bottom of the mechanical housing. A PD mounting bracket and a light source mounting bracket are fixed inside the probe. A light source adjustment bracket and a disc spring are fixed to the light source adjustment bracket. A beam splitter and a cross-shaped groove for accommodating the beam splitter are attached inside the PD mounting bracket. The light source mounting bracket has a first placement groove and a first plano-convex lens with a convex surface facing outwards, consistent with the first placement groove. A second placement groove corresponding to the first placement groove is provided on the side of the PD mounting bracket close to the cross-shaped groove. A second plano-convex lens with a convex surface corresponding to the first plano-convex lens is attached inside the second placement groove.

[0009] Furthermore, a light-shielding block that fits into the cross groove is fixedly arranged horizontally with the plane of the PD mounting bracket.

[0010] Furthermore, one end of the probe along its length is shaped like an "8" and has a mounting hole on the sloping surface of the "8". A glass rod is inserted into the mounting hole, and a support rod is inserted into the plane of the "8".

[0011] Furthermore, a reflector mounting bracket and a reflector glued to the reflector mounting bracket are fixedly connected to the end of the support rod away from the probe. The probe is attached to the bottom of the mechanical housing and a step is provided, and the tilt direction of the reflector corresponds to the step.

[0012] Furthermore, the mechanical housing is provided with multiple PD light source holes for determining water content, determining oil medium, and measuring optical channels, respectively.

[0013] Furthermore, the top of the mechanical housing is fixed with a plug for integrating electrical wires and signal lines.

[0014] Furthermore, the component module includes a light-emitting diode unit connected to the probe, and the light-emitting diode unit is connected to an optical component unit and a photoelectric conversion array unit.

[0015] Furthermore, the signal processing module includes a signal acquisition unit connected to the photoelectric conversion array unit, and the signal acquisition unit is connected to a data processing unit and a display unit.

[0016] Compared with the prior art, the advantages of this utility model are:

[0017] This solution uses an optical sensor installed in the pipeline system and inserted into the fuel to continuously analyze the trace water content of the flowing fuel, without relying on chemical detection of periodically representative samples. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a novel online sensor for monitoring trace water content in aviation fuel proposed in this utility model;

[0020] Figure 2 This is a schematic diagram of a partial structure of the probe of a novel online sensor for monitoring trace water content in aviation fuel proposed in this utility model;

[0021] Figure 3 This is a schematic diagram of the first plano-convex lens and the light source mounting bracket of a novel online sensor for monitoring trace water content in aviation fuel proposed in this utility model;

[0022] Figure 4 This is a schematic diagram of the reflector and reflector mounting bracket of a novel online sensor for monitoring trace water content in aviation fuel, as proposed in this utility model.

[0023] Figure 5 This is a schematic diagram of the PD mounting bracket and beam splitter of a novel online sensor for monitoring trace water content in aviation fuel proposed in this utility model;

[0024] Figure 6 This is a schematic diagram of the installation structure of a PD mounting bracket and light-shielding block for a novel online sensor for monitoring trace water content in aviation fuel, as proposed in this utility model.

[0025] Figure 7 This is a schematic diagram of the light source mounting bracket, light source adjustment bracket, and disc spring of a novel online sensor for monitoring trace water content in aviation fuel proposed in this utility model.

[0026] Figure 8 This is a schematic diagram of the PD mounting bracket, light-shielding block, and second plano-convex lens structure of a novel online sensor for monitoring trace water content in aviation fuel proposed in this utility model.

[0027] Figure 9 This utility model presents a component module block diagram of a novel online sensor for monitoring trace water content in aviation fuel.

[0028] Figure 10 This invention presents a block diagram of the signal processing module for a novel online sensor for monitoring trace water content in aviation fuel.

[0029] The correspondence between the numbers in the attached diagram is as follows:

[0030] 1. Mechanical housing; 2. Plug; 3. Probe; 301. Mounting hole; 302. Support rod; 4. Glass rod; 5. First plano-convex lens; 501. Light source mounting bracket; 502. Light source adjustment bracket; 6. Reflector; 601. Reflector mounting bracket; 7. PD light source hole; 701. PD mounting bracket; 702. Beam splitter; 703. Light shield; 704. Second plano-convex lens; 8. Disc spring. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figures 1-10 A novel online sensor for monitoring trace water content in aviation fuel includes a component module 303 and a signal processing module 9, and also includes:

[0033] Mechanical casing 1;

[0034] The probe 3 has a top diameter that matches the diameter of the mechanical housing 1, and is fixed to the bottom of the mechanical housing 1. Inside the probe 3 is a PD mounting bracket 701 and a light source mounting bracket 501 fixed on the PD mounting bracket 701. The light source mounting bracket 501 has a light source adjustment bracket 502 and a disc spring 8 mounted on the light source adjustment bracket 502. A beam splitter 702 and a cross groove for accommodating the beam splitter 702 are attached inside the PD mounting bracket 701. The light source mounting bracket 501 has a first placement groove and a first plano-convex lens 5 with its convex surface facing outwards, consistent with the first placement groove. On the side of the PD mounting bracket 701 close to the cross groove, there is a second placement groove corresponding to the first placement groove. A second plano-convex lens 704 with its convex surface corresponding to the first plano-convex lens 5 is attached inside the second placement groove. The first plano-convex lens 5 and the second plano-convex lens 704 are used for light focusing.

[0035] Preferably, a light-shielding block 703 that fits into the cross groove is fixedly mounted on the plane of the PD mounting bracket 701, which is horizontally aligned with the cross groove.

[0036] Preferably, one end of the probe 3 along its length is V-shaped and has a mounting hole 301 on the slope of the V-shape. A glass rod 4 is inserted into the mounting hole 301, and a support rod 302 is inserted on the flat surface of the V-shape. The light source can be transmitted through the channel of the glass rod 4.

[0037] Preferably, the end of the support rod 302 away from the probe 3 is fixedly connected to a reflector 6 mounting bracket and a reflector 6 pasted on the reflector 6 mounting bracket. The reflector 6 is used to reflect the light source. The probe 3 is attached to the bottom of the mechanical housing 1 and a step is provided. The tilt direction of the reflector 6 corresponds to the step.

[0038] Preferably, the mechanical housing 1 has multiple PD light source holes 7 for determining water content, determining oil medium, and measuring optical channels, respectively.

[0039] Preferably, the top of the housing 1 is fixed with a plug 2 for integrating wires and signal lines.

[0040] Preferably, the component module 303 includes a light-emitting diode unit 3031 connected to the probe 3. The light-emitting diode unit 3031 is connected to an optical component unit 3032 and a photoelectric conversion array unit 3033. The mechanical housing 1 is used for positioning, installing, sealing and protecting the light-emitting diode unit 3031, the optical component unit 3022 and the photoelectric conversion array unit 3033.

[0041] Preferably, the signal processing module 9 includes a signal acquisition unit 901 connected to the photoelectric conversion array unit 3033, and a data processing unit 902 and a display unit 903 are connected to the signal acquisition unit 901.

[0042] The simulation principle of the sensor for verifying trace water content in aviation fuel is analyzed as follows (simulation model):

[0043] 1. Signal definition:

[0044] V1: η1 times the power of the light source;

[0045] V2: η2 times the light source power × pollution coefficient s2 × (1 - scattering coefficient c2);

[0046] V3: η3 times the light source power × pollution coefficient s3 × scattering coefficient c3;

[0047] in:

[0048] ηi: Efficiency coefficient of the i-th channel;

[0049] s2, s3: Pollution coefficients (reflecting the impact of pollution on the signal);

[0050] c2, c3: Scattering coefficients (related to water content p).

[0051] 2. Signal-to-weight ratio:

[0052]

[0053] In the above formula, it is assumed that c2 = k2p (the scattering coefficient is linearly related to the water content):

[0054] Where b2 = η 2， a2 = η2k2;

[0055] In the above formula, assume c3 = k3p

[0056] Where a3 = η3k3.

[0057] 3. Calibration Phase

[0058] Assume no pollution, s2 = s3 = 1;

[0059] p is known (measured by other methods), measurement and Fitting calculations for a2, b2, and a3:

[0060]

[0061] 4. Test when there is no contamination

[0062] s2=s3=1, given a2, b2, a3;

[0063] Measurement and Solution p:

[0064]

[0065] Derivation

[0066] (Can be used to verify consistency.)

[0067] 5. Test when contaminated (single measurement)

[0068] s2 and s3 are unknown, a2, b2, and a3 are known;

[0069] System of equations:

[0070]

[0071] Unknowns: p, s2, s3 (3 in total), Equations: 2, No unique solution.

[0072] 6. Test for contamination (online calibration, two measurements)

[0073] Assuming measurements are taken at time points 1 and 2 respectively, pollution coefficients s2 and s3 remain unchanged (pollution is stable in a short period of time), and water content changes from p1 to p2.

[0074] Solving the system of equations

[0075] We need to solve the following four equations:

[0076]

[0077] Time point 1: Formulas 1 and 2 above are as follows:

[0078]

[0079] Time point 2: Formulas 3 and 4 are as follows:

[0080]

[0081] Unknowns: s2, s3, p1, p2 (4 variables), 4 equations, solvable. Step 1:

[0082] Express s3 from equations 2 and 4

[0083] From equation 2: From equation 4: therefore

[0084]

[0085]

[0086] set up Then p2 = rp1.

[0087] Step 2: Express s² from Equations 1 and 3. From Equation 1:

[0088]

[0089] From equation 3:

[0090]

[0091] therefore:

[0092]

[0093] Cross-multiplication:

[0094]

[0095] Expand:

[0096]

[0097] tidy:

[0098]

[0099] Step 3: Calculate p2

[0100]

[0101] Step 4: Calculate s2 and s3

[0102] From p1 and equation 1:

[0103]

[0104] From p1 and equation 2:

[0105]

[0106] Verify the correctness of the solution.

[0107] Given a2, b2, a3, p1, p2, s2, s3 can be solved through two measurements. Example:

[0108] Set calibration parameters:

[0109] a2 = 1, b2 = 2, a3 = 1;

[0110] First measurement (p1 = 0.5, s2 = 0.8, s3 = 0.9):

[0111]

[0112] Second measurement (p2 = 0.6, s2 = 0.8, s3 = 0.9):

[0113]

[0114] Calculate r:

[0115]

[0116] (verify: (correct);

[0117] Calculate p1:

[0118] (correct);

[0119] Calculate s2:

[0120] (correct);

[0121] Calculate s3:

[0122] (correct);

[0123] Conclusion: By performing two measurements (online calibration), the pollution coefficients s2 and s3 and the water content p1 and p2 can be solved. The specific steps are as follows:

[0124] 1. Calculate the ratio

[0125] 2. Calculate p1:

[0126]

[0127] 3. Calculate p2 = rp1;

[0128] 4. Calculation

[0129] 5. Calculation

[0130] The above method utilizes the assumption that the pollution coefficient remains unchanged in the two measurements, and solves for the four unknowns through four equations.

[0131] The implementation principle of a novel online sensor for monitoring trace water content in aviation fuel according to an embodiment of this application is as follows: The assembly personnel, wearing nitrile gloves, install the glass rod 4 into the corresponding mounting hole 301 of the probe 3. The support rod 302 is inserted into the probe 3. The reflector 6 is glued to the reflector 6 mounting bracket with the reflective surface facing outwards. The reflector 6 mounting bracket is then installed onto the support rod 302 and fixed with screws. The reflector 6 is tilted relative to the step of the probe 3. Finally, the beam splitter 702 is placed into the PD mounting bracket 7. In the cross groove of 01, install the light-shielding block 703 and fix it with screws. Glue the plano-convex lens to the PD mounting bracket 701 (convex side facing out) and to the light source mounting bracket 501 (convex side facing out). Place the disc spring 8 into the light source adjustment bracket 502, then install the light source adjustment bracket 502 to the light source mounting bracket 501. Install the screws, but do not tighten them. Install the PD mounting bracket 701 to the probe 3 and the light source mounting bracket 501 to the PD mounting bracket 701, both using screws. The LED unit 3031, acting as a light source, emits laser light that is collimated, split, refracted, and reflected by optical elements to form a measurement optical path. The optical signal is converted into a current signal by the photoelectric conversion array unit 3033. The measurement signal generated by the photoelectric conversion array unit 3033 can be transmitted to the signal acquisition unit 901 via a signal cable. The data processing unit 902 calculates the trace water content based on the current signal, and the display unit 903 displays the test results. When the infrared laser propagates in a medium with a non-uniform refractive index, it is scattered. When it passes through a pure test medium, the infrared laser is reflected back to the photodetector by the reflector 6, forming a reflected signal. When it passes through a test medium containing trace water, the infrared laser forms a scattered signal in addition to the reflected signal. When it passes through a medium with a different refractive index than the test medium, there is no measurement signal. By detecting the reflected and scattered signals in real time, measurement errors caused by impurity sedimentation and contact surface corrosion can be compensated, improving the accuracy and repeatability of the measurement.

[0132] All structures in this application can be customized in terms of material and length according to actual usage. The attached drawings are schematic structural diagrams, and the actual dimensions can be adjusted accordingly.

[0133] The above description is only a preferred embodiment of this practice, but the scope of protection of this embodiment is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope of the technology disclosed in this embodiment, based on the technical solution and the inventive concept of this embodiment, should be covered within the scope of protection of this embodiment.

Claims

1. A novel online sensor for monitoring trace water content in aviation fuel, comprising an element module and a signal processing module, characterized in that, Also includes: Mechanical casing; The probe has a top diameter that matches the diameter of the mechanical housing and is fixed to the bottom of the mechanical housing. A PD mounting bracket and a light source mounting bracket are fixed inside the probe. A light source adjustment bracket and a disc spring are fixed to the light source adjustment bracket. A beam splitter and a cross-shaped groove for accommodating the beam splitter are attached inside the PD mounting bracket. The light source mounting bracket has a first placement groove and a first plano-convex lens with a convex surface facing outwards, consistent with the first placement groove. A second placement groove corresponding to the first placement groove is provided on the side of the PD mounting bracket close to the cross-shaped groove. A second plano-convex lens with a convex surface corresponding to the first plano-convex lens is attached inside the second placement groove.

2. The novel online sensor for monitoring trace water content in aviation fuel according to claim 1, characterized in that, The cross groove is level with the plane of the PD mounting bracket and a light-shielding block that fits into the cross groove is fixed thereon.

3. A novel online sensor for monitoring trace water content in aviation fuel according to claim 1, characterized in that, One end of the probe along its length is shaped like an "8" and has a mounting hole on the sloping surface of the "8". A glass rod is inserted into the mounting hole, and a support rod is inserted into the plane of the "8".

4. A novel online sensor for monitoring trace water content in aviation fuel according to claim 3, characterized in that, The end of the support rod away from the probe is fixedly connected to a reflector mounting bracket and a reflector attached to the reflector mounting bracket. The probe is attached to the bottom of the mechanical housing and has a step, and the tilt direction of the reflector corresponds to the step.

5. A novel online sensor for monitoring trace water content in aviation fuel according to claim 1, characterized in that, The mechanical housing has multiple PD light source holes for determining water content, determining oil medium, and measuring optical channels, respectively.

6. A novel online sensor for monitoring trace water content in aviation fuel according to claim 1, characterized in that, The top of the mechanical housing is fixed with a plug for integrating electrical wires and signal lines.

7. A novel online sensor for monitoring trace water content in aviation fuel according to claim 1, characterized in that, The component module includes a light-emitting diode unit connected to the probe, and the light-emitting diode unit is connected to an optical component unit and a photoelectric conversion array unit.

8. A novel online sensor for monitoring trace water content in aviation fuel according to claim 7, characterized in that, The signal processing module includes a signal acquisition unit connected to the photoelectric conversion array unit, and the signal acquisition unit is connected to a data processing unit and a display unit.

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