Differential absorption detection device for ammonia nitrogen concentration of water body based on microwave remote sensing

Abstract

The invention discloses a microwave remote sensing-based water ammonia nitrogen concentration differential absorption detection device, and relates to the technical field of water pollution detection, the microwave remote sensing-based water ammonia nitrogen concentration differential absorption detection device comprises a floating platform used for floating on a detected water body and a mounting plate arranged on the floating platform, and the mounting plate is provided with a microwave transmitting module and a microwave receiving module which are used for microwave remote sensing detection; the floating platform is provided with a signal processing and analyzing module used for information processing and a data storage and display module. In the detection process, through mutual cooperation of the swing assembly, the water body depth recognition assembly, the lifting assembly and the adjusting assembly, microwave signals emitted by the microwave emission module on the mounting plate can cover the water surface with a larger area, three-dimensional sampling of the water body is achieved, and the one-sidedness of single-point detection is avoided; the detection state can be adaptively adjusted according to the depth of the detected water body in the detection process, and flexible detection operation is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of water pollution detection, and in particular to a water body ammonia nitrogen concentration differential absorption detection device based on microwave remote sensing. Background Art

[0002] The microwave remote sensing-based differential absorption detection device for ammonia nitrogen concentration in water uses the interaction characteristics between microwaves and pollutants such as ammonia nitrogen in water to detect water pollution. The core principle of this device is "differential absorption spectroscopy", which combines microwave remote sensing technology to detect the specific absorption characteristics of ammonia nitrogen molecules in water. The specific principles are as follows:

[0003] Interaction between microwave and ammonia nitrogen

[0004] Ammonia nitrogen (NH3, NH4 + ) molecules have specific absorption spectra in the microwave frequency band (usually GHz level, such as 20-100GHz). When microwave signals pass through water, ammonia nitrogen molecules selectively absorb microwave energy of specific frequencies, causing signal intensity to attenuate, and the degree of attenuation is positively correlated with ammonia nitrogen concentration;

[0005] The core logic of differential absorption

[0006] Two microwave wavelengths with similar frequencies are selected: one is the characteristic absorption frequency of ammonia nitrogen (measurement frequency), and the other is the reference frequency that ammonia nitrogen hardly absorbs. The attenuation difference of the microwave signals of the two wavelengths in the water body is compared (ie "differential absorption") to eliminate the interference of other components in the water body (such as water molecules, suspended matter, etc.) and environmental factors (such as temperature, salinity), so as to accurately invert the ammonia nitrogen concentration.

[0007] During the monitoring operation of the differential absorption detection device for ammonia nitrogen concentration in water based on microwave remote sensing, the microwave transmitting module and the microwave receiving module on the device are in relatively fixed positions, which limits the area of ​​the water surface covered by the microwave and is not convenient for three-dimensional sampling. Moreover, since the microwave transmitting module and the microwave receiving module are in relatively fixed positions, the operating height cannot be adaptively adjusted according to the depth of the water body, which affects the flexible detection operation. Therefore, we propose a differential absorption detection device for ammonia nitrogen concentration in water based on microwave remote sensing. Summary of the Invention

[0008] The purpose of the present invention is to provide a device for detecting ammonia nitrogen concentration in water bodies by differential absorption based on microwave remote sensing, so as to solve the problems raised in the above-mentioned background technology.

[0009] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a device for detecting ammonia nitrogen concentration in water by differential absorption based on microwave remote sensing, comprising a floating platform for floating on the detection water body and a mounting plate disposed on the floating platform, wherein a microwave transmitting module and a microwave receiving module for microwave remote sensing detection are mounted on the mounting plate, a signal processing and analysis module and a data storage and display module for information processing are disposed on the floating platform, and further comprising:

[0010] A moving component is provided at the bottom of the floating platform to assist the floating platform in moving on the surface of the water;

[0011] A swing assembly is provided on the floating platform to assist in swinging the mounting plate;

[0012] A water depth identification component is provided on the floating platform for identifying the water depth;

[0013] A lifting component is provided on the floating platform for adjusting the height of the mounting plate according to the depth of the water body. An adjusting component is provided between the lifting component and the swing component for adaptively adjusting the swing amplitude during the lifting process.

[0014] Preferably, the swing assembly includes a swing plate, the mounting plate is fixed to the lower end of the swing plate, a transmission groove is provided on the swing plate, a transmission pin is slidably connected to the transmission groove, and the floating platform is provided with a connecting assembly for assisting the swing plate in rotatable connection and a driving assembly for driving the transmission pin;

[0015] By adopting the above technical solution, the microwave signal emitted by the microwave transmitting module on the mounting plate can cover a larger area of ​​the water surface, thereby achieving three-dimensional sampling of the water body and avoiding the one-sidedness of single-point detection.

[0016] Preferably, the connecting assembly includes a connecting plate and a mounting seat provided above the floating platform, the connecting plate and the mounting seat are connected and fixed by multiple groups of connecting rods, and the upper end of the swing plate is rotatably connected to the mounting seat via a pin;

[0017] By adopting the above technical solution, the rotatable connection between the end of the swing plate and the mounting seat is facilitated.

[0018] Preferably, the driving assembly includes an operating plate arranged between the mounting seat and the floating platform, a telescopic assembly for assisting the telescopic connection is arranged between the mounting seat and the operating plate, a circular groove is opened on the operating plate, a circular disc is rotatably connected inside the circular groove, one end of the transmission pin is fixed to the circular disc, and the transmission pin is arranged in an eccentric state on the circular disc, and a rotating assembly for rotating the circular disc is provided on the operating plate;

[0019] By adopting the above technical solution, the swing plate and the mounting plate at one end of the swing plate are forced to swing back and forth in a fan shape.

[0020] The rotating assembly includes a gear ring fixed to the outside of the disc, an L-shaped frame fixed to one side of the operating panel, a gear rotatably connected to the L-shaped frame, the gear and the gear ring are meshed with each other, and a first motor for driving the gear is mounted on the L-shaped frame;

[0021] By adopting the above technical solution, the disc is driven to rotate on the circular groove.

[0022] Preferably, the telescopic assembly includes mounting blocks fixed to both sides of the mounting seat, a T-shaped rod is slidably connected to the mounting block, and one end of the T-shaped rod is fixed to the upper end of the operating plate;

[0023] By adopting the above technical solution, the telescopic guidance between the auxiliary operating plate and the mounting seat is facilitated.

[0024] Preferably, the lifting assembly includes a lifting platform arranged above the floating platform, the lifting platform is rotatably connected to a threaded rod, the threaded rod is threadedly engaged with a threaded tube, one end of the threaded tube is fixed to the upper end of the floating platform, and a guide assembly for guiding during the lifting process is provided between the lifting platform and the floating platform;

[0025] By adopting the above technical solution, the lifting platform can perform lifting motion after being subjected to force.

[0026] Preferably, the adjustment assembly includes a mounting bracket fixed to the upper end of the lifting platform, the connecting plate is fixedly mounted on the mounting bracket, a transmission plate is fixed to the operating plate, a threaded sleeve is fixed to the transmission plate, a screw rod is rotatably connected to the mounting bracket, the threaded sleeve is threadedly engaged with the screw rod, and one end of the screw rod is fixed to one end of the threaded rod, a second motor for driving the screw rod is mounted on the upper end of the mounting bracket, a plurality of guide rods are slidably connected to the transmission plate, and the guide rods are fixed between the mounting bracket and the lifting platform;

[0027] By adopting the above technical solution, the use status of the disc and the transmission pin on the disc can be adjusted.

[0028] Preferably, the guide assembly includes a plurality of sleeves fixed to the upper end of the floating platform, the sleeves are slidably connected to a slide rod, and one end of the slide rod is fixed to the lifting platform;

[0029] By adopting the above technical solution, the lifting and lowering guidance of the auxiliary lifting platform is facilitated.

[0030] Preferably, the water depth identification component and the swing component are symmetrically arranged on both sides of the floating platform, and the water depth identification component includes a fixed platform fixed to one side of the floating platform, and an echo sounder for identifying the water depth is installed on the fixed platform;

[0031] By adopting the above technical solution, the water depth of the location where the floating platform is used is identified.

[0032] Preferably, the mobile assembly includes a mounting groove provided at the bottom of the floating platform, and a water jet propulsion pump for assisting the mobile drive is installed on the mounting groove;

[0033] By adopting the above technical solution, the auxiliary floating platform can be easily moved.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] During the detection process of the present invention, through the mutual cooperation of the swing component, the water depth identification component, the lifting component and the adjustment component, the microwave signal emitted by the microwave transmission module on the installation plate can cover a larger area of ​​the water surface, realize three-dimensional sampling of the water body, avoid the one-sidedness of single-point detection, and can also realize the adaptive adjustment of the detection state according to the depth of the detected water body during the detection process, thereby facilitating flexible detection operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall appearance structure of the present invention;

[0037] Figure 2 It is a schematic diagram of the structure of the mobile component of the present invention;

[0038] Figure 3 It is a schematic structural diagram of the swing assembly of the present invention;

[0039] Figure 4 It is a schematic structural diagram of the lifting assembly, guide assembly and adjustment assembly of the present invention;

[0040] Figure 5 It is a schematic structural diagram of the rotating assembly and the telescopic assembly of the present invention;

[0041] Figure 6 This is a schematic diagram of the structure of the drive assembly of the present invention;

[0042] Figure 7 A schematic diagram of the swinging process of the swinging assembly of the present invention;

[0043] Figure 8 This is a schematic diagram of the swinging state of the swing assembly of the present invention when the use height is increased;

[0044] Figure 9 This is a schematic diagram of the swinging state of the swing assembly when the use height is reduced according to the present invention.

[0045] In the figure: 101-floating platform; 102-mounting plate; 201-mounting slot; 202-water jet propulsion pump; 301-swinging plate; 302-transmission slot; 303-transmission pin; 401-connecting plate; 402-connecting rod; 403-mounting seat; 404-pin shaft; 501-operating plate; 502-circular slot; 503-circular disc; 601-gear ring; 602-L-shaped frame; 603-gear; 604-first motor; 701-mounting block; 702-T-bar; 801-lifting platform; 802-threaded rod; 803-threaded pipe; 901-casing; 902-sliding rod; 1001-transmission plate; 1002-mounting frame; 1003-screw rod; 1004-threaded sleeve; 1005-second motor; 1006-guide rod; 1101-fixed platform; 1102-echo sounder. DETAILED DESCRIPTION

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0047] Example 1

[0048] See also Figures 1-9 The microwave remote sensing-based differential absorption detection device for ammonia nitrogen concentration in water shown in the figure includes a floating platform 101 for floating on the detection water body and a mounting plate 102 arranged on the floating platform 101. The mounting plate 102 is equipped with a microwave transmitting module and a microwave receiving module for microwave remote sensing detection. The floating platform 101 is equipped with a signal processing and analysis module and a data storage and display module for information processing.

[0049] It should be noted that the microwave emission module emits two microwave beams at a preset frequency, one of which is the measurement frequency (f1) corresponding to ammonia nitrogen (NH3 / NH4 +) characteristic absorption frequency band, one beam is the reference frequency (f2), and the frequency band with no significant absorption of ammonia nitrogen is selected to offset the nonspecific attenuation of the water background (water molecules, suspended matter). The microwave receiving module synchronously captures the measurement frequency and reference frequency signals after water attenuation, converts them into electrical signals and transmits them to the signal processing and analysis module. The signal processing and analysis module performs denoising filtering (eliminating environmental electromagnetic interference) and gain amplification on the electrical signals to improve the signal-to-noise ratio and compare the signal attenuation of the measurement frequency and the reference frequency. During the processing, the differential absorption value is calculated. Based on the Lambert-Beer law, combined with the pre-calibrated mapping relationship between the microwave absorption coefficient and the ammonia nitrogen concentration, the ammonia nitrogen concentration in the water body is inverted, and the inversion result is stored in the storage and display module. The storage and display module outputs the concentration value, waveform or spatial distribution curve in real time, supports historical data query and export, and during the entire detection process, the device compares the calculated ammonia nitrogen concentration data with the water quality standard to determine the degree of water pollution;

[0050] It is worth noting that the microwave transmission module, microwave receiving module, signal processing and analysis module, and data storage and display module are conventional components of the differential absorption detection technology for ammonia nitrogen concentration in water based on microwave remote sensing in this application. Their working principles and operation methods are considered as prior art in this application and are not elaborated on here.

[0051] Also includes:

[0052] A moving component is provided at the bottom of the floating platform 101 to assist the floating platform 101 in moving on the surface of the water;

[0053] A swing assembly is provided on the floating platform 101 to assist in swinging the mounting plate 102;

[0054] A water depth identification component is provided on the floating platform 101 for identifying the water depth;

[0055] A lifting assembly is provided on the floating platform 101 for adjusting the height of the mounting plate 102 according to the depth of the water body. An adjusting assembly is provided between the lifting assembly and the swing assembly for adaptively adjusting the swing amplitude during the lifting process.

[0056] It should be noted here that: during the detection process, through the mutual cooperation of the swing component, the water depth identification component, the lifting component and the adjustment component, the microwave signal emitted by the microwave transmission module on the mounting plate 102 can cover a larger area of ​​the water surface, realize three-dimensional sampling of the water body, avoid the one-sidedness of single-point detection, and also realize the adaptive adjustment of the detection state according to the depth of the detected water body during the detection process, thereby facilitating flexible detection operations.

[0057] Preferably, the swing assembly includes a swing plate 301, the mounting plate 102 is fixed to the lower end of the swing plate 301, a transmission groove 302 is opened on the swing plate 301, a transmission pin 303 is slidably connected to the transmission groove 302, and a connecting assembly for assisting the swing plate 301 to be rotatably connected and a driving assembly for driving the driving pin 303 are provided on the floating platform 101;

[0058] It should be noted here that: through transmission, the swing plate 301 and the mounting plate 102 at one end of the swing plate 301 are forced to swing back and forth in a fan shape. Through the fan-shaped reciprocating swing of the mounting plate 102, the microwave signal emitted by the microwave transmitting module on the mounting plate 102 covers a larger area of ​​the water surface, realizing three-dimensional sampling of the water body and avoiding the one-sidedness of single-point detection.

[0059] Preferably, the connecting assembly includes a connecting plate 401 and a mounting seat 403 provided above the floating platform 101. The connecting plate 401 and the mounting seat 403 are connected and fixed by multiple groups of connecting rods 402. The upper end of the swing plate 301 is rotatably connected to the mounting seat 403 via a pin 404.

[0060] It should be noted that the pin 404 facilitates the rotatable connection between the end of the swing plate 301 and the mounting seat 403 .

[0061] Preferably, the driving assembly includes an operating plate 501 disposed between the mounting seat 403 and the floating platform 101, a telescopic assembly for assisting the telescopic connection is disposed between the mounting seat 403 and the operating plate 501, a circular groove 502 is provided on the operating plate 501, a circular disc 503 is rotatably connected to the interior of the circular groove 502, one end of the transmission pin 303 is fixed to the circular disc 503, and the transmission pin 303 is eccentrically disposed on the circular disc 503, and a rotating assembly for rotating the circular disc 503 is disposed on the operating plate 501;

[0062] It should be noted here that: the disc 503 is driven to rotate on the circular groove 502 through the rotating assembly. During the rotation of the disc 503, the interaction between the transmission pin 303 and the transmission groove 302 on the swing plate 301 and the rotatable connection of the mounting seat 403 to the swing plate 301 through the pin shaft 404 cause the swing plate 301 and the mounting plate 102 at one end of the swing plate 301 to be forced to swing back and forth in a fan shape.

[0063] The rotating assembly includes a ring gear 601 fixed to the outside of the disc 503. An L-shaped frame 602 is fixed to one side of the operating panel 501. A gear 603 is rotatably connected to the L-shaped frame 602. The gear 603 and the ring gear 601 are meshed with each other. A first motor 604 for driving the gear 603 is mounted on the L-shaped frame 602.

[0064] It should be noted that the first motor 604 drives the gear 603 to rotate. During the rotation of the gear 603 , the gear 603 and the gear ring 601 are meshed with each other to drive the disk 503 to rotate on the circular groove 502 .

[0065] Preferably, the telescopic assembly includes mounting blocks 701 fixed to both sides of the mounting base 403, a T-shaped rod 702 is slidably connected to the mounting block 701, and one end of the T-shaped rod 702 is fixed to the upper end of the operating plate 501;

[0066] It should be noted that the two sets of mounting blocks 701 and the two sets of T-shaped rods 702 facilitate the telescopic guidance between the auxiliary operating panel 501 and the mounting seat 403 .

[0067] Preferably, the lifting assembly includes a lifting platform 801 disposed above the floating platform 101, a threaded rod 802 being rotatably connected to the lifting platform 801, a threaded tube 803 being threadedly engaged with the threaded rod 802, one end of the threaded tube 803 being fixed to the upper end of the floating platform 101, and a guide assembly for guiding during the lifting process being disposed between the lifting platform 801 and the floating platform 101;

[0068] It should be noted here that: the threaded rod 802 is driven to rotate through transmission. During the rotation of the threaded rod 802, the lifting platform 801 is lifted and lowered through the mutual engagement transmission between the threaded rod 802 and the threaded tube 803 and the sliding guiding effect of the sleeve 901 and the slide rod 902.

[0069] Preferably, the adjustment assembly includes a mounting frame 1002 fixed to the upper end of the lifting platform 801, the connecting plate 401 is fixedly mounted on the mounting frame 1002, a transmission plate 1001 is fixed on the operating plate 501, a threaded sleeve 1004 is fixed on the transmission plate 1001, a screw rod 1003 is rotatably connected to the mounting frame 1002, the threaded sleeve 1004 is threadedly engaged with the screw rod 1003, and one end of the screw rod 1003 is fixed to one end of the threaded rod 802, a second motor 1005 for driving the screw rod 1003 is installed on the upper end of the mounting frame 1002, a plurality of guide rods 1006 are slidably connected to the transmission plate 1001, and the guide rods 1006 are fixed between the mounting frame 1002 and the lifting platform 801;

[0070] It should be noted here that: during the rotation of the screw rod 1003, through the mutual meshing transmission of the screw rod 1003 and the threaded sleeve 1004 and the sliding guiding effect of the multiple sets of guide rods 1006, the transmission plate 1001 and the operating plate 501 are driven to move relative to or away from the mounting seat 403, and the operating plate 501 moves upward relative to the mounting seat 403 to adjust the usage status of the disc 503 and the transmission pin 303 on the disc 503.

[0071] Preferably, the guide assembly includes a plurality of sleeves 901 fixed to the upper end of the floating platform 101, and a slide rod 902 is slidably connected to the sleeve 901, and one end of the slide rod 902 is fixed to the lifting platform 801;

[0072] It should be noted here that the sleeve 901 and the slide bar 902 facilitate the lifting and lowering guidance of the auxiliary lifting platform 801.

[0073] Example 2

[0074] See also Figure 1-Figure 2 This embodiment further illustrates the first embodiment. In the figure, the water depth identification component and the swing component are symmetrically arranged on both sides of the floating platform 101. The water depth identification component includes a fixed platform 1101 fixed to one side of the floating platform 101. The fixed platform 1101 is equipped with an echo sounder 1102 for identifying the water depth.

[0075] It should be noted here that: the water depth at the location where the floating platform 101 is used is identified by the echo sounder 1102 on the fixed platform 1101;

[0076] It is worth noting here that the echo sounder 1102 uses the propagation speed and reflection characteristics of ultrasonic waves in water to calculate the depth of the water body by measuring the time interval from the emission to the reception of the sound waves. The working principle and operation method of the echo sounder 1102 are regarded as prior art in this application and will not be elaborated on here.

[0077] Preferably, the mobile assembly includes a mounting groove 201 provided at the bottom of the floating platform 101, and a water jet propulsion pump 202 for assisting the mobile drive is installed on the mounting groove 201;

[0078] It should be noted that the auxiliary floating platform 101 is moved by the driving action of the water jet propulsion pump 202 inside the installation tank 201;

[0079] It is worth noting here that the water jet propulsion pump 202 is a conventional driving component, and its working principle and operation method are regarded as the prior art in this application, and no further details are given here.

[0080] In this scheme: The differential absorption detection device for ammonia nitrogen concentration in water based on microwave remote sensing includes the following steps:

[0081] The floating platform 101 is placed on the surface of the water to be tested. After placement, the floating platform 101 is moved to the specified position on the water surface through the movement of the moving component. After the movement is completed, the microwave transmitting module emits two beams of microwaves at a preset frequency, one of which is the measurement frequency (f1), corresponding to the ammonia nitrogen (NH3 / NH4 +) characteristic absorption frequency band, one beam is the reference frequency (f2), and the frequency band with no significant absorption of ammonia nitrogen is selected to offset the nonspecific attenuation of the water background (water molecules, suspended matter). The microwave receiving module synchronously captures the measurement frequency and reference frequency signals after water attenuation, converts them into electrical signals and transmits them to the signal processing and analysis module. The signal processing and analysis module performs denoising filtering (eliminating environmental electromagnetic interference) and gain amplification on the electrical signals to improve the signal-to-noise ratio and compare the signal attenuation of the measurement frequency and the reference frequency. During the processing, the differential absorption value is calculated. Based on the Lambert-Beer law, combined with the pre-calibrated mapping relationship between the microwave absorption coefficient and the ammonia nitrogen concentration, the ammonia nitrogen concentration in the water body is inverted, and the inversion result is stored in the storage and display module. The storage and display module outputs the concentration value, waveform or spatial distribution curve in real time, supports historical data query and export, and during the entire detection process, the device compares the calculated ammonia nitrogen concentration data with the water quality standard to determine the degree of water pollution;

[0082] During the detection process, the first motor 604 drives the gear 603 to rotate. During the rotation of the gear 603, the gear 603 and the ring gear 601 are meshed with each other to drive the disc 503 to rotate on the circular groove 502. During the rotation of the disc 503, the interaction between the transmission pin 303 and the transmission groove 302 on the swing plate 301 and the rotatable connection of the mounting seat 403 to the swing plate 301 through the pin 404 cause the swing plate 301 and the mounting plate 102 at one end of the swing plate 301 to be forced to swing back and forth in a fan shape (see FIG. Figure 7 The microwave signal emitted by the microwave transmitting module on the mounting plate 102 covers a larger area of ​​the water surface by swinging back and forth in a fan shape, thereby achieving three-dimensional sampling of the water body and avoiding the one-sidedness of single-point detection;

[0083] In the process of detection, the depth of the water body at the detection position is identified by the water body depth identification component. When the identified telescopic depth is deeper, the second motor 1005 drives the screw rod 1003 to rotate. During the rotation of the screw rod 1003, the threaded rod 802 is driven to rotate. During the rotation of the threaded rod 802, the mutual meshing transmission between the threaded rod 802 and the threaded tube 803 and the sliding guide effect of the sleeve 901 and the slide rod 902 are used to make the lifting platform 801 rise after the force is applied. During the upward and downward movement of 01, the connection between the mounting frame 1002, the connecting plate 401, the connecting rod 402, the mounting seat 403 and the swing plate 301 drives the mounting plate 102 to move upward, thereby increasing the use height of the microwave transmitting module and the microwave receiving module. During the rotation of the screw rod 1003, the mutual engagement transmission between the screw rod 1003 and the threaded sleeve 1004 and the sliding guide function of the multiple groups of guide rods 1006 drive the transmission plate 1001 and the operating plate 501 to move relative to the mounting seat 403 under force (see FIG. Figure 8 The operation plate 501 is moved upward relative to the mounting base 403 to adjust the use state of the disc 503 and the transmission pin 303 on the disc 503. Since one end of the swing plate 301 is rotatably connected to the mounting base 403, by adjusting the position of the transmission pin 303 toward the mounting base 403, the microwave transmitting module and the microwave receiving module on the swing plate 301 and the mounting plate 102 swing more significantly during the rotation of the transmission pin 303 and the transmission slot 302 (see FIG. Figure 8 Therefore, when the water depth at the detection location is deep, the use height of the microwave transmitting module and the microwave receiving module is increased and the swing amplitude of the microwave transmitting module and the microwave receiving module is increased through transmission. Since the water depth at different positions in the deep water area varies greatly, by increasing the use height and swing amplitude of the microwave transmitting module and the microwave receiving module, microwaves can be incident at different angles, covering the oblique profile from the water surface to the deep layer, achieving a more comprehensive three-dimensional scan, avoiding the limitation of single-point detection, and forming a fan-shaped scanning area in the horizontal direction, which is suitable for large-scale monitoring of open deep water areas such as lakes and the center of reservoirs. When the water depth at the detection location is shallow, the use height of the microwave transmitting module and the microwave receiving module is lowered and the swing amplitude of the microwave transmitting module and the microwave receiving module is reduced through opposite transmission (see Figure 9The thickness of water in shallow water is limited. If the detection height is too high, microwaves will easily penetrate the water and be reflected by the bottom of the water, forming multiple reflection clutter, which interferes with the characteristic signal of ammonia nitrogen. Lowering the height can shorten the signal optical path, so that microwaves can be mainly transmitted in the water, reducing the interference of bottom reflection. By reducing the swing amplitude, microwaves can be fixedly emitted within a small angle range to avoid scanning the air or the bottom of the water, ensuring that the detection area only covers the surface to the middle layer of the water, improving the pertinence of the data, and realizing the adaptive adjustment of the detection state according to the depth of the detected water during the detection process, which is convenient for flexible detection operations.

[0084] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0085] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A microwave remote sensing-based ammonia nitrogen concentration differential absorption detection device for water bodies, comprising: A floating platform (101) for floating on a detection water body and a mounting plate (102) arranged on the floating platform (101), wherein a microwave transmitting module and a microwave receiving module for microwave remote sensing detection are mounted on the mounting plate (102), and a signal processing and analysis module and a data storage and display module for information processing are arranged on the floating platform (101); It is characterized by further comprising: A moving component is provided at the bottom of the floating platform (101) and is used to assist the floating platform (101) in moving on the surface of the water body; A swing assembly is provided on the floating platform (101) and is used to assist in swinging the mounting plate (102); A water depth identification component is provided on the floating platform (101) and is used for identifying the water depth; A lifting assembly is provided on the floating platform (101) for adjusting the height of the mounting plate (102) according to the depth of the water body. An adjusting assembly for adaptively adjusting the swing amplitude during the lifting process is provided between the lifting assembly and the swing assembly.

2. The device for detecting ammonia nitrogen concentration in water based on microwave remote sensing according to claim 1, characterized in that: The swing assembly includes a swing plate (301), the mounting plate (102) is fixed to the lower end of the swing plate (301), a transmission groove (302) is provided on the swing plate (301), a transmission pin (303) is slidably connected to the transmission groove (302), and a connecting assembly for assisting the swing plate (301) in rotatable connection and a driving assembly for driving the transmission pin (303) are provided on the floating platform (101).

3. The device for detecting ammonia nitrogen concentration in water based on microwave remote sensing according to claim 2, characterized in that: The connecting assembly comprises a connecting plate (401) and a mounting seat (403) arranged above the floating platform (101); the connecting plate (401) and the mounting seat (403) are connected and fixed via multiple groups of connecting rods (402); and the upper end of the swing plate (301) is rotatably connected to the mounting seat (403) via a pin shaft (404).

4. The device for detecting ammonia nitrogen concentration in water based on microwave remote sensing according to claim 3, characterized in that: The driving assembly includes an operating plate (501) arranged between the mounting seat (403) and the floating platform (101); a telescopic assembly for assisting telescopic connection is arranged between the mounting seat (403) and the operating plate (501); a circular groove (502) is provided on the operating plate (501); a circular disc (503) is rotatably connected inside the circular groove (502); one end of the transmission pin (303) is fixed to the circular disc (503), and the transmission pin (303) is eccentrically arranged on the circular disc (503); and a rotating assembly for rotating the circular disc (503) is provided on the operating plate (501); The rotating assembly includes a ring gear (601) fixed to the outside of the disc (503); an L-shaped frame (602) is fixed to one side of the operating panel (501); a gear (603) is rotatably connected to the L-shaped frame (602); the gear (603) and the ring gear (601) are meshed with each other; and a first motor (604) for driving the gear (603) is mounted on the L-shaped frame (602).

5. The device for detecting ammonia nitrogen concentration in water based on microwave remote sensing according to claim 3, characterized in that: The telescopic assembly comprises mounting blocks (701) fixed on both sides of the mounting seat (403), a T-shaped rod (702) is slidably connected to the mounting block (701), and one end of the T-shaped rod (702) is fixed to the upper end of the operating plate (501).

6. The device for detecting ammonia nitrogen concentration in water based on microwave remote sensing according to claim 5, characterized in that: The lifting assembly comprises a lifting platform (801) arranged above the floating platform (101), a threaded rod (802) being rotatably connected to the lifting platform (801), a threaded tube (803) being threadedly engaged with the threaded rod (802), one end of the threaded tube (803) being fixed to the upper end of the floating platform (101), and a guide assembly for guiding during the lifting process being arranged between the lifting platform (801) and the floating platform (101).

7. The device for detecting ammonia nitrogen concentration in water based on microwave remote sensing according to claim 6, characterized in that: The adjustment assembly comprises a mounting frame (1002) fixed to the upper end of the lifting platform (801), the connecting plate (401) is fixedly mounted on the mounting frame (1002), a transmission plate (1001) is fixed on the operating plate (501), a threaded sleeve (1004) is fixed on the transmission plate (1001), a screw rod (1003) is rotatably connected to the mounting frame (1002), the threaded sleeve (1004) is threadedly engaged with the screw rod (1003), and one end of the screw rod (1003) is fixed to one end of the threaded rod (802), a second motor (1005) for driving the screw rod (1003) is mounted on the upper end of the mounting frame (1002), a plurality of guide rods (1006) are slidably connected to the transmission plate (1001), and the guide rods (1006) are fixed between the mounting frame (1002) and the lifting platform (801).

8. The device for detecting ammonia nitrogen concentration in water based on microwave remote sensing according to claim 6, characterized in that: The guide assembly comprises a plurality of sleeves (901) fixed to the upper end of the floating platform (101), a slide rod (902) is slidably connected to the sleeves (901), and one end of the slide rod (902) is fixed to the lifting platform (801).

9. The device for detecting ammonia nitrogen concentration in water based on microwave remote sensing according to claim 1, characterized in that: The water depth identification component and the swing component are symmetrically arranged on both sides of the floating platform (101). The water depth identification component includes a fixed platform (1101) fixed to one side of the floating platform (101), and an echo sounder (1102) for identifying the water depth is installed on the fixed platform (1101).

10. The device for detecting ammonia nitrogen concentration in water based on microwave remote sensing according to claim 1, characterized in that: The moving assembly comprises a mounting groove (201) opened at the bottom of the floating platform (101), and a water jet propulsion pump (202) for assisting the moving drive is installed on the mounting groove (201).

Images