Underwater spectrum sensor field calibration device and method

Abstract

The invention discloses a field calibration device and method for an underwater spectrum sensor, and the method comprises the steps: preparing standard solutions with various concentrations, including pure water solutions; measuring the standard incident light intensity and each standard emergent light intensity in each standard solution, and obtaining each standard absorbance according to the standard incident light intensity and each standard emergent light intensity; respectively placing the test containers containing the standard solutions in test grooves to measure standard test incident light intensity and each standard test emergent light intensity, and obtaining each standard test absorbance according to the standard test incident light intensity and each standard test emergent light intensity; obtaining a first function relationship according to each standard absorbance and each standard test absorbance; placing the test container containing the standard solution in a field test tank to measure the field test incident light intensity and each field test emergent light intensity, and obtaining each field test absorbance according to the field test incident light intensity and each field test emergent light intensity; obtaining corresponding standard absorbance according to the field test absorbance and the first function relation; and a calibration function is obtained according to the concentration of each standard solution on site and the corresponding standard absorbance, so that the efficiency and accuracy of on-site calibration of the sensor are improved.

Description

Technical Field

[0001] This invention belongs to the field of spectral sensor calibration technology, specifically, it relates to an underwater spectral sensor on-site calibration device and method. Background Technology

[0002] Spectroscopic sensors, such as COD sensors, are frequently installed in water networks or factory pipelines, and may be installed in multiple orientations. When sensors mounted on Argo buoys undergo sea trials, they are secured to the buoy using clamps. Traditionally, when sensors require calibration, they are removed from their mounting position and placed in a calibration container filled with standard solution for calibration.

[0003] This may damage the original installation structure, and it requires carrying standard solutions and large calibration containers. At the same time, the work site may not meet the calibration conditions, resulting in unsatisfactory calibration results. Summary of the Invention

[0004] This invention provides an on-site calibration device and method for underwater spectral sensors, which enables on-site calibration of sensors without disassembling them, reducing the difficulty of on-site calibration of underwater spectral sensors and improving the efficiency and accuracy of on-site calibration.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A field calibration method for an underwater spectral sensor, the underwater spectral sensor including a test tank for filling with a test liquid, outputting emitted light intensity, and obtaining the concentration of the test liquid based on the emitted light intensity, includes the following steps; Prepare standard solutions of various concentrations, including pure aqueous solutions with a concentration of 0; The underwater spectral sensor is placed in each of the standard solutions to obtain the emitted light intensity in the pure aqueous solution and the emitted light intensity corresponding to the standard solution of other concentrations, which are respectively denoted as standard incident light intensity and standard emitted light intensity. The standard absorbance corresponding to each concentration of the standard solution is obtained based on the standard emitted light intensity and the standard incident light intensity. Set up test containers; place the test containers containing the standard solutions of various concentrations into the test tank to obtain the corresponding standard test incident light intensity and the standard test outgoing light intensity; The absorbance of each standard test corresponding to the test using the test container is obtained based on the standard test incident light intensity and each of the standard test output light intensities. A first functional relationship between the standard test absorbance and the standard absorbance obtained using the test container is obtained based on each of the standard absorbance and each of the standard test absorbance. Multiple test containers containing standard solutions of different concentrations are placed in the test tanks on site to obtain the corresponding on-site incident light intensity and on-site outgoing light intensity. The absorbance of each field test is obtained based on the incident light intensity and the emitted light intensity of each field test. The corresponding standard absorbance is obtained based on the on-site test absorbance and the first functional relationship. The second functional relationship between the concentration and the standard absorbance of each standard solution on site is obtained based on the concentration and the corresponding standard absorbance.

[0006] In some specific embodiments,

[0007] in, The standard absorbance; The standard incident light intensity; The standard emitted light intensity;

[0008] in, The standard test absorbance; The standard test incident light intensity; The standard test output light intensity.

[0009] In some specific embodiments, both the first functional relationship and the second functional relationship are linear.

[0010] In some specific embodiments, a constant temperature chamber is used to set multiple stable calibration temperatures to obtain the standard incident light intensity, the standard emitted light intensity, the standard test incident light intensity, and the standard test emitted light intensity at each calibration temperature. Based on each calibration temperature and the corresponding standard absorbance and standard test absorbance, the first functional relationship between the standard test absorbance tested using the test container and the standard absorbance and calibration temperature is obtained.

[0011] In some specific embodiments, the first functional relationship is obtained by fitting multiple arrays consisting of the calibration temperature and its corresponding standard absorbance and the standard test absorbance.

[0012] An on-site calibration device for an underwater spectral sensor, the underwater spectral sensor including a test tank for filling with a test liquid, outputting emitted light intensity, and obtaining the concentration of the test liquid based on the emitted light intensity, including a test container and a fixing module; The test container includes a main body made of transparent material; the main body is a flat box for holding a standard solution and placing it in the test tank to obtain standard test incident light intensity, standard test outgoing light intensity, on-site test incident light intensity, and on-site test outgoing light intensity, including opposing first and second sidewalls, which are parallel flat plates; the test container also includes an entrance located at one end of the main body in the length direction, covering its width direction and protruding from the first or second sidewall, which is a box and communicates with the cavity of the main body, and has a first opening at one end in the width direction of the main body for filling the cavity of the main body with the standard solution; The fixing module is detachably and fixedly connected to the underwater spectral sensor and to the test container.

[0013] In some specific embodiments, the test container further includes at least one plug; at the other end of the main body in the length direction, at least one second opening is formed that is adapted to the plug, which connects the cavity to the external environment for cleaning the cavity; the plug is removable to plug the second opening.

[0014] In some specific embodiments, the main body further includes a third side wall, a fourth side wall, and a bottom wall, which are located at both ends in the width direction and the other end in the length direction of the main body, respectively. The entrance is a square box; the second opening is located on the first side wall and / or the second side wall and / or the third side wall and / or the fourth side wall and / or the bottom wall.

[0015] In some specific embodiments, the fixing module includes a first clamping component and a second clamping component; The first clamping assembly includes two first clamping arms and a crossbeam fixedly connected to each of the first clamping arms. Each first clamping arm is used to be detachably and fixedly connected to the underwater spectral sensor and is located on both sides of the test tank. The crossbeam is located on one side of the underwater spectral sensor and faces one end of the test tank or is open in the forward direction. The second clamping assembly includes two second clamping arms and a rotating component; one end of each second clamping arm is located on both sides of the test container and is pressed against the first side wall and the second side wall respectively, and the other end is fixedly connected to the rotating component; the rotating component is rotatably connected to the crossbeam.

[0016] In some specific embodiments, the outer side of the crossbeam is formed with all or part of the external threads; one end of the first clamping arm is fixedly connected to the crossbeam by a pair of nuts; The rotating component has a through hole that is adapted to the rotation of the crossbeam and is fitted onto the crossbeam; the rotating component is fixedly connected to the crossbeam by a pair of nuts.

[0017] Compared with the prior art, the advantages and positive effects of the present invention are: The underwater spectral sensor on-site calibration method of this invention involves setting up a portable and replaceable test container, acquiring multiple sets of standard absorbance from immersion tests and the standard absorbance from the test container, and obtaining the relationship between the standard absorbance of the test container and the standard absorbance. Then, the test container containing the standard solution is used for on-site sensor testing to obtain the test absorbance. The corresponding standard absorbance is obtained through the aforementioned first functional relationship. The correspondence between the solution concentration of the sensor to be calibrated and its standard absorbance, i.e., the calibration function, is obtained through mathematical transfer. This eliminates the need for disassembly during on-site sensor calibration; only the test container and the standard solution need to be disassembled and replaced. This solves the problems of difficult and demanding on-site sensor disassembly and assembly, improving calibration efficiency and accuracy, as well as enhancing sensor reliability and extending its service life.

[0018] The underwater spectral sensor field calibration device of the present invention enables calibration of the sensor's test tank in any position and orientation by setting a test container with an inlet. For example, when the test tank opening faces upward, the inlet can be placed at the top, filling the main body with standard solution; when the test tank opening faces to both sides, the inlet is placed at the top, filling the main body with standard solution; when the test tank opening faces downward, the inlet is located on one side (front, back, left, or right), with the first opening facing upward, filling the main body with standard solution; thus, the device enables on-site calibration of the sensor, improving the accuracy and efficiency of calibration. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a flowchart illustrating the on-site calibration method for underwater spectral sensors according to an embodiment; Figure 2 This is a flowchart illustrating the on-site calibration method for underwater spectral sensors according to an embodiment; Figure 3This is a schematic diagram of the structure of the underwater spectral sensor field calibration device according to an embodiment; Figure 4 This is a schematic diagram of the structure of the underwater spectral sensor field calibration device according to an embodiment; Figure 5 This is a schematic diagram of the structure of the underwater spectral sensor field calibration device according to an embodiment; Figure 6 This is a schematic diagram of the structure of the test container according to an embodiment; Figure 7 This is a schematic diagram of the structure of the test container according to an embodiment; Figure 8 This is a schematic diagram of the structure of the test container according to an embodiment.

[0021] In the picture, 01. Sensor; 011. Test tank; 1. Test container; 11. Main body; 111. First side wall; 112. Second side wall; 113. Third side wall; 114. Fourth side wall; 115. Bottom wall; 116. Second opening; 117. Cavity; 118. Blocking component; 12. Inlet; 121. First opening; 2. Fixing module; 21. First clamping assembly; 211. First clamping arm; 212. Crossbeam; 22. Second clamping assembly; 221. Second clamping arm; 222. Rotating component. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] Reference Figure 1 This invention discloses an on-site calibration method for an underwater spectral sensor, used for on-site calibration of an underwater spectral sensor 01; the sensor 01 includes a test tank 011, which is filled with a test liquid to obtain the intensity of the emitted light absorbed by the test liquid, and to obtain the concentration of the test liquid based on the intensity of the emitted light.

[0024] The on-site calibration method for underwater spectral sensors includes the following steps: S1. Prepare standard solutions of various concentrations, including a standard solution of pure water with a concentration of 0 and multiple standard solutions with a concentration greater than 0. S2. The underwater spectral sensor 01 is placed in various standard solutions to obtain the emitted light intensity of the pure water standard solution and the emitted light intensity of the standard solutions of other concentrations, which are denoted as the standard incident light intensity and the standard emitted light intensity, respectively. That is, the test tank 011 is filled with the pure water standard solution and the standard solution of other concentrations, respectively. The pure water standard solution and the standard solution of other concentrations can be filled sequentially in the same sensor 01 test tank 011, or they can be filled in the test tank 011 of different sensors 01 respectively. That is, the pure water standard solution and the standard solution of other concentrations are filled in different calibration containers. The sensor 01 is placed in each calibration container for testing. In addition, the light absorption of pure water is small and can be considered as 0, which is used as the incident light intensity. The underwater spectral sensor 01 is placed in each standard solution for testing as an immersion test. S3. Obtain the standard absorbance corresponding to each concentration of standard solution based on the standard emitted light intensity and the standard incident light intensity. S4. Set up test container 1, which is used to hold standard solutions and place them in test tank 011 for testing; place standard solutions of various concentrations into test container 1 respectively; place test containers 1 containing standard solutions of various concentrations into test tank 011 respectively to obtain the corresponding standard test incident light intensity and standard test output light intensity, which respectively correspond to the output light intensity obtained by placing test containers 1 containing pure water and standard solutions of other concentrations into test tank 011; to maintain the reliability and consistency of the data, each test container 1 is filled with standard solution; the test tank 011 here is the test tank 011 of sensor 01 in the immersion test in S2, which is the same type or model of sensor 01 as the field sensor 01; S5. Obtain the absorbance of each standard test corresponding to the test container 1 based on the standard test incident light intensity and the standard test output light intensity. S6. Based on each standard absorbance and each standard test absorbance, obtain the first functional relationship between the standard test absorbance and the standard absorbance tested using test container 1; the first functional relationship is the functional relationship between the standard absorbance and the standard test absorbance; that is, the functional relationship between the standard absorbance obtained by immersion testing and the standard test absorbance obtained by testing using test container 1 for standard solutions of the same concentration; S7. Place multiple test containers 1 containing standard solutions of different concentrations in the test tank 011 on site to obtain the corresponding on-site test incident light intensity and on-site test output light intensity; that is, place the test container 1 containing standard solution in the test tank 011 of the sensor 01 to be calibrated on site to obtain the output light intensity corresponding to pure water and standard solutions of various concentrations. S8. Obtain the absorbance of each field test based on the incident light intensity and the outgoing light intensity of each field test. S9. Obtain the corresponding standard absorbance based on the absorbance of each field test and the first functional relationship; that is, obtain the standard absorbance by immersing the field sensor 01 in standard solutions of various concentrations through the test method of test container 1. S10. Obtain the second functional relationship between the concentration of the field sensor 01 and the standard absorbance based on the concentration of each standard solution on site and its corresponding standard absorbance; that is, the functional relationship between the concentration of the solution directly filling the test tank 011 and the absorbance obtained by direct testing; that is, the calibration function of the field sensor 01.

[0025] The underwater spectral sensor on-site calibration method of the present invention involves setting up a portable and replaceable test container 1, acquiring multiple sets of standard absorbance from immersion tests and the standard test absorbance from the test container 1, and obtaining the relationship between the standard test absorbance and the standard absorbance. Then, the test container 1 containing the standard solution is used to test the sensor 01 on-site to obtain the test absorbance. The corresponding standard absorbance is obtained through the aforementioned first functional relationship. The correspondence between the solution concentration of the sensor 01 to be calibrated and its standard absorbance is obtained through mathematical transfer, i.e., the calibration function. This method eliminates the need for disassembly of the sensor 01 during on-site calibration; only the test container 1 and the standard solution need to be disassembled and replaced. This solves the problems of difficult and demanding disassembly and assembly of the sensor 01, improving calibration efficiency and accuracy, as well as enhancing the reliability and extending the service life of the sensor 01.

[0026] The specific process and principle of the on-site calibration method for underwater spectral sensors of the present invention will be described in detail below through specific embodiments.

[0027] In some specific embodiments,

[0028] in, Standard absorbance; Standard incident light intensity; Standard output light intensity;

[0029] in, For standard absorbance testing; The standard test is the incident light intensity; The standard test is for the emitted light intensity.

[0030] The on-site calibration method for underwater spectral sensors in this embodiment calculates absorbance by relating incident light intensity to emitted light intensity.

[0031] In some specific embodiments, both the first functional relationship and the second functional relationship are linear.

[0032] That is, the first functional relationship is:

[0033] Where A is the standard absorbance; a is the standard test absorbance; m and n are coefficients; It is obtained by reasoning the difference between the optical path for obtaining standard absorbance through immersion testing and the optical path for obtaining standard test absorbance through testing container 1.

[0034] Specifically, the optical path for immersion testing is the standard solution; the optical path for testing container 1 includes the sum of the optical paths of the container 1 material, the standard solution, and the air; since the absorbance of the container material and air is proportional to the absorbance of the solution, then...

[0035]

[0036] but,

[0038] That is, the first functional relationship is constructed as follows: The m and n coefficients were obtained by fitting multiple sets of standard absorbance and standard test absorbance, which characterize the relationship between the absorbance of the pure solution test and the test container 1 test.

[0039] The second functional relationship is:

[0040] in, For concentration; Standard absorbance; , The coefficient is obtained by fitting the concentrations of multiple standard solutions and the standard absorbance of the corresponding field sensor 01.

[0041] The on-site calibration method for underwater spectral sensors in this embodiment obtains the first functional relationship as a linear function by using the absorbance calculation formula and the difference between the optical path of the test container 1 test method and the immersion test optical path, thereby improving the accuracy of calibration.

[0042] In some specific embodiments, refer to Figure 2 Multiple stable calibration temperatures were set using a constant temperature chamber to obtain the standard incident light intensity, standard emitted light intensity, standard test incident light intensity, and standard test emitted light intensity at each calibration temperature.

[0043] Based on each calibration temperature and the corresponding standard absorbance and standard test absorbance, the first functional relationship between the standard test absorbance and the standard absorbance and calibration temperature is obtained when using test container 1.

[0044] When testing the field sensor 01 using test container 1, the test temperature and field test absorbance are obtained, and then substituted into the first function relationship mentioned above to obtain the corresponding standard absorbance.

[0045] The specific steps are as follows: S10. Prepare standard solutions of various concentrations, including a standard solution of pure water with a concentration of 0 and multiple standard solutions with a concentration greater than 0. S20. The underwater spectral sensor 01 is placed in various standard solutions to obtain the emitted light intensity of the pure water standard solution and the emitted light intensity of the standard solutions of other concentrations, which are denoted as the standard incident light intensity and the standard emitted light intensity, respectively. That is, the test tank 011 is filled with the pure water standard solution and the standard solution of other concentrations, respectively. The pure water standard solution and the standard solution of other concentrations can be filled sequentially in the same sensor 01 test tank 011, or they can be filled in the test tank 011 of different sensors 01 respectively. That is, the pure water standard solution and the standard solution of other concentrations are filled in different calibration containers. The sensor 01 is placed in each calibration container for testing. In addition, the light absorption of pure water is small and can be considered as 0, which is used as the incident light intensity. Placing the underwater spectral sensor 01 in each standard solution is an immersion test method. S30. Obtain the standard absorbance corresponding to each concentration of standard solution based on the standard emitted light intensity and standard incident light intensity. S40. Set up test container 1, which is used to hold standard solutions and place them in test tank 011 for testing; place standard solutions of various concentrations into test container 1 respectively; place test containers 1 containing standard solutions of various concentrations into test tank 011 to obtain the standard test incident light intensity and standard test output light intensity corresponding to multiple calibration temperatures, which respectively correspond to the output light intensity obtained by placing test containers 1 containing pure water and standard solutions of other concentrations into test tank 011; to maintain the reliability and consistency of the data, each test container 1 is filled with standard solution; the test tank 011 here is the test tank 011 of sensor 01 in the immersion test in S20, which is the same type or model of sensor 01 as the field sensor 01; S50. Obtain the absorbance of each standard test corresponding to the test container 1 based on the standard test incident light intensity and the standard test output light intensity. S60. Based on each standard absorbance, each standard test absorbance, and each calibration temperature, obtain the first functional relationship between the standard test absorbance, the calibration temperature, and the standard absorbance; the first functional relationship is the functional relationship between the standard absorbance, the standard test absorbance, and the calibration temperature; that is, the first functional relationship is the functional relationship between the standard absorbance obtained by immersion testing of the same concentration of standard solution and the standard test absorbance obtained by testing in test container 1 at the calibration temperature; S70. Multiple test containers 1 containing standard solutions of different concentrations are placed in the test tank 011 on site to obtain the corresponding on-site test incident light intensity and the on-site test output light intensity, and the test temperature is obtained; that is, the test container 1 containing standard solution is placed in the test tank 011 of the sensor 01 to be calibrated on site to obtain the output light intensity corresponding to pure water and standard solutions of various concentrations. S80. Obtain the absorbance of each field test based on the incident light intensity and the outgoing light intensity of each field test. S90. Obtain the corresponding standard absorbance based on the absorbance of each field test, the test temperature, and the first functional relationship; that is, obtain the standard absorbance of the field sensor 01 immersed in standard solutions of various concentrations at the field test temperature through the test method of test container 1. S100. Based on the concentration of each standard solution on site and its corresponding standard absorbance, obtain the second functional relationship between the concentration of the on-site calibration and the standard absorbance; the second functional relationship is the functional relationship between the concentration of the solution directly filling the test tank 011 and the absorbance directly obtained after filling the solution, which is the calibration function of the on-site sensor 01.

[0046] This embodiment of the underwater spectral sensor field calibration method incorporates temperature influence factors when obtaining standard test absorbance from test container 1. The standard absorbance obtained from the test absorbance in field test container 1 is then calibrated, eliminating errors caused by the temperature difference between the field and off-site (laboratory) testing environments, thus improving the accuracy of field calibration. In some specific embodiments, the first functional relationship is obtained by fitting multiple arrays consisting of calibration temperatures and their corresponding standard absorbances and standard test absorbances.

[0047] Specifically, a constant temperature chamber is set and its temperature is adjusted to t1, t2, t3, t4; then the standard absorbance a of each concentration of standard solution at each calibration temperature is obtained.

[0048] The arrays are listed below:

[0049]

[0050]

[0051]

[0052]

[0053] Among them, the arrays in the first row , , , The standard absorbance of container 1 for the same concentration of standard solution is tested at different calibration temperatures; the data in each array in the following rows can be deduced from the above description.

[0054] By fitting the above data, the following mathematical relationship can be obtained:

[0055] Where t is the calibration temperature; , , , is a coefficient.

[0056] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 The present invention also discloses an on-site calibration device for underwater spectral sensors. The sensor 01 includes a test tank 011 for filling with test liquid, outputting emitted light intensity, and obtaining the concentration of the test liquid based on the emitted light intensity.

[0057] The on-site calibration device for underwater spectral sensors includes: a test container 1 and a fixing module 2.

[0058] The test container 1 includes a main body 11 made of transparent material; the main body 11 is a flat box body, used to hold the standard solution and place it in the test tank 011 to obtain the standard test incident light intensity, standard test outgoing light intensity, on-site test incident light intensity, and on-site test outgoing light intensity, including a first side wall 111 and a second side wall 112, which are parallel flat plates; the test container 1 also includes an inlet 12 located at one end of the length direction of the main body 11, covering its width direction and protruding from the first side wall 111 or the second side wall 112, which is a box body and communicates with the cavity 117 of the main body 11, and has a first opening 121 at one end of the width direction of the main body 11 for filling the cavity 117 of the main body 11 with the standard solution.

[0059] The fixing module 2 is detachably and fixedly connected to the underwater spectral sensor 01 and the test container 1, and is used to fix the test container 1 and the sensor 01 relative to each other during on-site calibration of the sensor 01.

[0060] The underwater spectral sensor on-site calibration device of the present invention enables calibration of the sensor 01's test tank 011 in any position and orientation by setting a test container 1 with an inlet 12. For example, when the test tank 011 opening faces upward, the inlet 12 can be placed at the top, filling the main body 11 with standard solution; when the test tank 011 opening faces to both sides, the inlet is placed at the top, filling the main body 11 with standard solution; when the test tank 011 opening faces downward, the inlet 12 is located on one side (front, back, left, or right), and the first opening 121 faces upward, filling the main body 11 with standard solution; thus, on-site calibration of the sensor 01 is achieved, improving calibration accuracy and efficiency.

[0061] The specific structure and principle of the underwater spectral sensor field calibration device of the present invention will be described in detail below through specific embodiments.

[0062] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 The test container 1 also includes at least one plug 118; the other end of the main body 11 in the length direction is formed with at least one second opening 116 that is adapted to the plug 118, which communicates the cavity 117 with the external environment and is used to clean the cavity 117; the plug 118 can be detachably plugged to block the second opening 116.

[0063] The underwater spectral sensor field calibration device of this embodiment provides at least one second opening 116 at one end opposite to the first opening 121, and uses a plug 118 to block it when the standard solution is filled; when the standard solution is replaced, the plug 118 is opened to facilitate the discharge of the standard solution and the flushing with the standard solution to be replaced, thereby improving the accuracy and reliability of the concentration of the standard solution in the test container 1, and thus improving the calibration accuracy.

[0064] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 The plug 118 is made of rubber.

[0065] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 Test container 1 is made of glass.

[0066] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 The main body 11 also includes a third side wall 113, a fourth side wall 114, and a bottom wall 115, which are located at both ends in the width direction and the other end in the length direction of the main body 11, respectively.

[0067] The entrance 12 is a square box; the second opening 116 is located on the first side wall 111 and / or the second side wall 112 and / or the third side wall 113 and / or the fourth side wall 114 and / or the bottom wall 115.

[0068] The underwater spectral sensor field calibration device of this embodiment has multiple second openings 116 to facilitate drainage and cleaning of the test container 1 when it is located in various positions and orientations, thereby improving replacement efficiency and calibration efficiency.

[0069] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 The fixing module 2 includes a first clamping component 21 and a second clamping component 22.

[0070] The first clamping assembly 21 includes two first clamping arms 211 and a crossbeam 212 fixedly connected to each of the first clamping arms 211. Each first clamping arm 211 is used to be detachably and fixedly connected to the sensor 01 and is located on both sides of the test slot 011. The crossbeam 212 is located on one side of the underwater spectral sensor 01 and is directly opposite one end of the test slot 011.

[0071] The second clamping assembly 22 includes two second clamping arms 221 and a rotating component 222; one end of each second clamping arm 221 is located on both sides of the test container 1 and is pressed against the first side wall 111 and the second side wall 112 respectively, and the other end is fixedly connected to the rotating component 222; the rotating component 222 is rotatably connected to the crossbeam 212.

[0072] The underwater spectral sensor field calibration device of this embodiment sets the crossbeam 212 at one end facing the test slot 011, so that the test container 1 is placed into the test slot 011 by rotating the rotating component 222 and rotated out of the test slot 011 on one side of the width direction of the test container 1. When it is in the test slot 011, one side wall of the test container 1 is close to the bottom of the test slot 011. This avoids the problem of interference between the test container 1 and the wall of the test slot 011 when it is rotated in and out, reduces the requirements for the specifications and shape of the test container 1, reduces the installation difficulty, and improves the calibration efficiency.

[0073] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 The fixing module 2 includes a first clamping component 21 and a second clamping component 22.

[0074] The first clamping assembly 21 includes two first clamping arms 211 and a crossbeam 212 fixedly connected to each of the first clamping arms 211. Each first clamping arm 211 is used to be detachably and fixedly connected to the underwater spectral sensor 01 and is located on both sides of the test tank 011. The crossbeam 212 is located on one side of the underwater spectral sensor 01 and faces the front opening of the test tank 011.

[0075] The second clamping assembly 22 includes two second clamping arms 221 and a rotating component 222; one end of each second clamping arm 221 is located on both sides of the test container 1 and is pressed against the first side wall 111 and the second side wall 112 respectively, and the other end is fixedly connected to the rotating component 222; the rotating component 222 is rotatably connected to the crossbeam 212.

[0076] In this embodiment, the underwater spectral sensor is positioned with the crossbeam 212 outside the positive opening of the test slot 011. The test container 1 connected to the rotating member 222 must be careful to avoid interference with the test slot 011 when one end of the test container 1 is rotated in and out. This can be achieved by setting a rounded corner at the end of the test container 1 located inside the test slot 011.

[0077] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 The outer side of the crossbeam 212 has all or part of external threads; one end of the first clamping arm 211 is fixedly connected to the crossbeam 212 by a pair of nuts.

[0078] The rotating component 222 has a through hole that is rotatably adapted to the crossbeam 212 and is fitted onto the crossbeam 212; the rotating component 222 is fixedly connected to the crossbeam 212 by a pair of nuts.

[0079] The underwater spectral sensor field calibration device of this embodiment fixes the first clamping arm 211 and the rotating component 222 to the crossbeam 212 with a pair of nuts. This facilitates the adjustment of the position of each first clamping arm 211 and the free rotation and fixation of the rotating component 222, so that the test device can stabilize the position of the test container 1 during calibration, thereby improving the accuracy and efficiency of calibration.

[0080] In some specific embodiments, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 An elastic pad is provided inside the end of the second clamping arm 221 that is connected to the test container 1 to increase the friction between the second clamping arm 221 and the test container 1 and to prevent the rigid connection from damaging the test container 1, thereby improving the safety and stability of the calibration.

[0081] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0082] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0083] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0084] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0085] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0086] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for on-site calibration of an underwater spectral sensor, wherein the underwater spectral sensor includes a test tank for filling with a test liquid, outputting emitted light intensity, and obtaining the concentration of the test liquid based on the emitted light intensity, characterized in that... include: Prepare standard solutions of various concentrations, including pure aqueous solutions with a concentration of 0; The underwater spectral sensor is placed in each of the standard solutions to obtain the emitted light intensity in the pure aqueous solution and the emitted light intensity corresponding to the standard solution of other concentrations, which are respectively denoted as standard incident light intensity and standard emitted light intensity. The standard absorbance corresponding to each concentration of the standard solution is obtained based on the standard emitted light intensity and the standard incident light intensity. Set up test containers; place the test containers containing the standard solutions of various concentrations into the test tank to obtain the corresponding standard test incident light intensity and the standard test outgoing light intensity; The absorbance of each standard test corresponding to the test using the test container is obtained based on the standard test incident light intensity and each of the standard test output light intensities. A first functional relationship between the standard test absorbance and the standard absorbance obtained using the test container is obtained based on each of the standard absorbance and each of the standard test absorbance. Multiple test containers containing standard solutions of different concentrations are placed in the test tanks on site to obtain the corresponding on-site incident light intensity and on-site outgoing light intensity. The absorbance of each field test is obtained based on the incident light intensity and the emitted light intensity of each field test. The corresponding standard absorbance is obtained based on the on-site test absorbance and the first functional relationship. The second functional relationship between the concentration and the standard absorbance of each standard solution on site is obtained based on the concentration and the corresponding standard absorbance.

2. The on-site calibration method for underwater spectral sensors according to claim 1, characterized in that, ； in, The standard absorbance; The standard incident light intensity; The standard emitted light intensity; ； in, The standard test absorbance; The standard test incident light intensity; The standard test output light intensity.

3. The on-site calibration method for underwater spectral sensors according to claim 1, characterized in that, Both the first functional relationship and the second functional relationship are linear.

4. The on-site calibration method for underwater spectral sensors according to claim 1 or 2, characterized in that, Using a constant temperature chamber, multiple stable calibration temperatures are set to obtain the standard incident light intensity, the standard emitted light intensity, the standard test incident light intensity, and the standard test emitted light intensity at each calibration temperature. Based on each calibration temperature and the corresponding standard absorbance and standard test absorbance, the first functional relationship between the standard test absorbance tested using the test container and the standard absorbance and calibration temperature is obtained.

5. The on-site calibration method for underwater spectral sensors according to claim 4, characterized in that, The first functional relationship is obtained by fitting multiple arrays consisting of the calibration temperature and its corresponding standard absorbance and the standard test absorbance.

6. A field calibration device for an underwater spectral sensor, the underwater spectral sensor comprising a test tank for filling with a test liquid, outputting emitted light intensity, and obtaining the concentration of the test liquid based on the emitted light intensity, characterized in that, include: The test container includes a main body made of transparent material; The main body is a flat box-shaped container used to hold the standard solution and place it in the test tank to obtain the standard test incident light intensity, standard test output light intensity, on-site test incident light intensity, and on-site test output light intensity. It includes opposing first and second sidewalls, which are parallel flat plates. The test container also includes an inlet located at one end of the main body in the length direction, covering its width direction and protruding from the first or second sidewall. It is a box-shaped container that communicates with the cavity of the main body. It has a first opening at one end of the main body in the width direction for filling the cavity of the main body with the standard solution. A fixed module is detachably and fixedly connected to the underwater spectral sensor and to the test container.

7. The underwater spectral sensor field calibration device according to claim 6, characterized in that, The test container also includes at least one plug; at the other end of the main body in the length direction, at least one second opening is formed that is adapted to the plug, which connects the cavity to the external environment and is used to clean the cavity; the plug can be detachably plugged to block the second opening.

8. The underwater spectral sensor field calibration device according to claim 7, characterized in that, The main body also includes a third side wall, a fourth side wall, and a bottom wall, which are located at both ends in the width direction and the other end in the length direction of the main body, respectively. The entrance is a square box; the second opening is located on the first side wall and / or the second side wall and / or the third side wall and / or the fourth side wall and / or the bottom wall.

9. The on-site calibration device for underwater spectral sensors according to any one of claims 6 to 8, characterized in that, The fixing module includes: The first clamping assembly includes two first clamping arms and a crossbeam fixedly connected to each of the first clamping arms. Each first clamping arm is used to be detachably and fixedly connected to the underwater spectral sensor and is located on both sides of the test tank. The crossbeam is located on one side of the underwater spectral sensor and faces one end of the test tank or is open in the forward direction. The second clamping assembly includes two second clamping arms and a rotating component; one end of each second clamping arm is located on both sides of the test container and is pressed against the first side wall and the second side wall respectively, and the other end is fixedly connected to the rotating component; the rotating component is rotatably connected to the crossbeam.

10. The on-site calibration device for underwater spectral sensors according to claim 9, characterized in that, The outer side of the crossbeam has all or part of external threads; one end of the first clamping arm is fixedly connected to the crossbeam by a pair of nuts. The rotating component has a through hole that is adapted to the rotation of the crossbeam and is fitted onto the crossbeam; the rotating component is fixedly connected to the crossbeam by a pair of nuts.

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