Automatic monitoring system and method for sewage discharge river

Abstract

The present invention provides an automatic monitoring system and method for a sewage river channel, including a first bracket and a sensing optical fiber set for each sewage pipe, the first bracket is located directly above the sewage pipe and laid in the soil, the sensing optical fibers in each first bracket are connected in sequence and then connected to a remote monitoring device, for each first bracket, one end of the sensing optical fiber is inserted from one end of the first support tube, and then passes through the first through hole at the fixed position of the first support tube and the second support tube, and is wound twice between the second support tube and the third support tube to form two layers of front optical fiber segments vertically facing each other, and then penetrates into the first support tube and passes through the other end of the first support tube, and the sensing optical fiber is fixedly connected to the two ends of the first support tube respectively, and the vertical distances of the two layers of front optical fiber segments to the sewage pipe are different. In the initial state, the two layers of front optical fiber segments are orthogonal to the sewage pipe. The present invention can realize sewage discharge measurement by using sensing optical fibers, and is not easily damaged.

Description

Technical Field

[0001] The invention belongs to the field of optical fiber detection, and in particular relates to an automatic monitoring system and method for a sewage discharge river channel. Background Art

[0002] With the development of economy, the amount of sewage discharged in my country has been increasing, which has caused serious pollution of surface water and the environmental quality has been deteriorating. The country and provinces and cities are paying more and more attention to the protection of ecological environment, and are constantly strengthening the governance of water pollution to protect water sources and rivers. However, due to the weak awareness of environmental protection and the drive of interests, there are many factors such as random discharge and random discharge of sewage, which cause serious environmental pollution. Therefore, it is imperative to increase investment in monitoring and supervising sewage discharge, strengthen environmental monitoring, establish an online monitoring system for illegal discharge of sewage in rivers, grasp the rules and conditions of drainage into rivers, and improve river management capabilities.

[0003] At present, when monitoring the amount of sewage discharged into the river from the sewage pipe, a flow meter is usually used. Although this method can realize the monitoring of sewage discharge, the flow meter is usually placed at the sewage outlet of the sewage pipe, which is easy to be damaged. In addition, when encountering human damage, it is impossible to warn of the destructive behavior. During the period of flow meter damage, the sewage discharge cannot be monitored, resulting in discontinuous sewage discharge monitoring. Summary of the invention

[0004] The invention provides a sewage discharge river automatic monitoring system and method, so as to solve the problem that the flow meter placed at the sewage discharge port is easily damaged when the sewage discharge amount is currently monitored by the flow meter.

[0005] According to a first aspect of an embodiment of the present invention, there is provided an automatic monitoring system for a sewage river channel, comprising a first bracket and a sensing optical fiber set for each sewage pipe, the sewage pipe being set in front and back, the first bracket being located directly above the sewage pipe and being laid in the soil, wherein each first bracket comprises a first support tube and a second support tube and a third support tube respectively fixedly connected to the first support tube, the sensing optical fibers in each first bracket being connected in sequence and then connected to a remote monitoring device, for each first bracket, one end of the sensing optical fiber is inserted from one end of the first support tube, and then passes out from a first through hole at a fixed position of the first support tube and the second support tube, is wound around the second support tube and the third support tube for two turns, so that two layers of front optical fiber segments are formed vertically opposite to each other between the second support tube and the third support tube, and then is inserted into the first support tube and passes out from the other end of the first support tube, the sensing optical fiber is respectively fixedly connected to both ends of the first support tube, the vertical distances of the two layers of front optical fiber segments to the sewage pipe are different, and in the initial state, the two layers of front optical fiber segments are arranged horizontally left and right and are orthogonal to the sewage pipe;

[0006] The remote monitoring device sends a laser signal to the sensing optical fiber. For each sensing optical fiber, after receiving the laser signal, the sensing optical fiber transmits the backscattered light signal back to the remote monitoring device. The remote monitoring device determines the amplitude of each measuring point on the two layers of front optical fiber segments of the sensing optical fiber according to the backscattered light signal, and establishes a group of equations according to the size relationship of the amplitudes of each measuring point on one layer of the front optical fiber segment, the amplitudes measured at the corresponding measuring points on the two layers of the front optical fiber segments, and the spatial geometric relationship between the corresponding measuring points and their vibration source points to calculate the vertical distance between the first bracket and the sewage pipe; and determines the sewage discharge volume of the sewage pipe according to the vertical distance.

[0007] According to a second aspect of an embodiment of the present invention, a monitoring method of an automatic monitoring system for a sewage discharge channel is also provided, wherein a remote monitoring device monitors the discharge volume according to the following steps:

[0008] Step S110, sending a laser signal to the sensing optical fiber, and for each first bracket, after receiving the laser signal, the sensing optical fiber transmits the backscattered light signal in reverse to the remote monitoring device; the remote monitoring device determines the amplitude of each measuring point on the two layers of the front optical fiber segment of the sensing optical fiber according to the backscattered light signal;

[0009] Step S120: according to the magnitude relationship of the amplitudes of the respective measurement points on the first layer of the front optical fiber segment, determine two measurement points on the first layer of the front optical fiber segment with the same amplitude: a first measurement point Q1 and a second measurement point Q2, wherein a point on the second layer of the front optical fiber segment that is vertically opposite to the first measurement point Q1 is used as a third measurement point Q3, and a point on the second layer of the front optical fiber segment that is vertically opposite to the second measurement point Q2 is used as a fourth measurement point Q4;

[0010] Step S130: for each pair of measurement points vertically facing each other on the two layers of front optical fiber segments, the amplitude of the pair of measurement points and the vertical distance between the two layers of front optical fiber segments are substituted into the vibration longitudinal wave attenuation model of the sewage pipe in the vertical direction to determine whether the vibration longitudinal wave attenuation model is established; if so, the pair of measurement points are respectively used as current orthogonal measurement points on the corresponding layer of front optical fiber segments, and the current orthogonal measurement points are located directly above the sewage pipe;

[0011] Step S140, establishing a set of equations according to the amplitudes measured at the four measuring points Q1-Q4 and the spatial geometric relationship between the four measuring points Q1-Q4 and the vibration source point, and calculating the vertical distance between the first bracket and the sewage pipe;

[0012] Step S150: Determine the sewage discharge volume of the sewage pipe according to the vertical distance.

[0013] The beneficial effects of the present invention are:

[0014] The present invention monitors the sewage discharge of the sewage pipe by utilizing the sensing optical fiber inserted into the soil, thereby reducing the risk of damage to the sewage discharge detection device. In addition, the present invention is provided with two layers of front optical fiber segments that are vertically opposite to each other. According to the size relationship of the amplitudes of each measuring point on one layer of the front optical fiber segments, the amplitudes measured at the corresponding measuring points on the two layers of the front optical fiber segments, and the spatial geometric relationship between the corresponding measuring points and their vibration source points, the vertical distance between the first bracket and the sewage pipe is calculated, and the sewage discharge of the sewage pipe is determined according to the vertical distance, thereby improving the accuracy of sewage discharge measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a top view of an embodiment of the sewage channel monitoring system of the present invention;

[0016] Figure 2 yes Figure 1 A front view of

[0017] Figure 3 is a schematic diagram showing that after the first bracket is displaced, its front optical fiber segment is orthogonal to the sewage pipe;

[0018] Figure 4 It is a schematic diagram of the geometric relationship between the four measuring points Q1 to Q4 and their vibration source point when the front optical fiber segment is orthogonal to the sewage pipe after the first bracket is displaced;

[0019] Figure 5 is a top view of another embodiment of the sewage channel monitoring system of the present invention;

[0020] Figure 6 (a) and (b) are Figure 5 A front view of the first bracket and the second bracket;

[0021] Figure 7 It is a schematic diagram showing that after the first bracket is displaced, its front optical fiber segment is not orthogonal to the sewage pipe;

[0022] Figure 8 It is a schematic diagram of the geometric relationship between four measuring points Q1-Q4 and their vibration source point when the first bracket is displaced and its front optical fiber segment is not orthogonal to the sewage pipe. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention and to make the above-mentioned purposes, features and advantages of the embodiments of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0024] In the description of the present invention, unless otherwise specified and limited, it should be noted that the term "connection" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two elements. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0025] See also Figure 1 , is a top view of an embodiment of the automatic monitoring system for sewage discharge channels of the present invention. Figure 2 As shown, the sewage channel automatic monitoring system may include a first bracket 2 and a sensing optical fiber 3 set for each sewage pipe 1, the sewage pipe 1 is arranged in front and behind, the first bracket 2 is located directly above the sewage pipe 1 and is laid in the soil, wherein each first bracket 2 includes a first support pipe 4 and a second support pipe 5 and a third support pipe 6 respectively fixedly connected to the first support pipe 4 (wherein the second support pipe 5 and the third support pipe 6 can be as shown in Figure 1 As shown, the sensing optical fiber 3 in each first bracket 2 is connected in sequence and then connected to the remote monitoring device. For each first bracket 2, one end of the sensing optical fiber 3 is inserted from one end of the first supporting tube 4, and then passes through the first through hole at the fixed position of the first supporting tube 4 and the second supporting tube 5, and is wound twice between the second supporting tube 5 and the third supporting tube 6, so that two layers of front optical fiber segments 31 and 32 are formed vertically facing each other between the second supporting tube 5 and the third supporting tube 6, and then is inserted into the first supporting tube 4. The sensing optical fiber 3 is fixedly connected to the two ends of the first supporting tube 4 respectively, so as to ensure that the positions of the two layers of front optical fiber segments wound between the second supporting tube and the third supporting tube on the sensing optical fiber remain unchanged; the free ends of the second supporting tube 5 and the third supporting tube 6 face the sewage outlet 11 of the sewage pipe 1, and the two layers of front optical fiber segments 31 and 32 have different vertical distances to the sewage pipe 1. In the initial state, the two layers of front optical fiber segments 31 and 32 are horizontally arranged left and right and are orthogonal to the sewage pipe 1.

[0026] The remote monitoring device sends a laser signal to the sensing optical fiber 3. For each sensing optical fiber 3, after receiving the laser signal, the sensing optical fiber 3 transmits the backscattered light signal back to the remote monitoring device. The remote monitoring device determines the amplitude of each measuring point on the two layers of front optical fiber segments 31 and 32 of the sensing optical fiber 3 according to the backscattered light signal, and establishes a set of equations according to the size relationship of the amplitudes of each measuring point on one layer of the front optical fiber segment, the amplitudes measured at the corresponding measuring points on the two layers of the front optical fiber segments 31 and 32, and the spatial geometric relationship between the corresponding measuring points and their vibration source points to calculate the vertical distance between the first bracket 2 and the sewage pipe 1; and determines the sewage discharge volume of the sewage pipe 1 according to the vertical distance.

[0027] In this embodiment, the free ends of the second support tube 5 and the third support tube 6 may be provided with two pairs of oppositely arranged through holes, wherein the first pair of through holes may be located directly above the second pair of through holes. In the initial state, the two pairs of through holes are arranged in a direction perpendicular to the direction of the sewage pipe 1; after the sensing optical fiber 3 passes through the first through hole, it passes through the first pair of through holes from the outer side 5 of the second support tube, and then passes through the second pair of through holes from the outer side of the third support tube 6; after the sensing optical fiber 3 passes through the second pair of through holes, it passes into the first through hole, and finally is arranged along the first support tube 4 and passes through the other end of the first support tube 4; the first support tube 4, the second support tube 5 and the third support tube 6 are always on the same plane, the optical fiber segment between the first pair of through holes is the upper front optical fiber segment 31, and the optical fiber segment between the second pair of through holes is the lower front optical fiber segment 32.

[0028] The present invention places the sensing optical fiber used to measure the sewage discharge amount in the soil, which can reduce the risk of the sewage discharge amount detection device being easily damaged. Although the sewage discharge amount of the sewage pipe can be measured by the sensing optical fiber, the sensing optical fiber is placed in the soil. When the soil settles, the sensing optical fiber will shift in the vertical direction. Correspondingly, the distance between the sensing optical fiber and the sewage pipe in the vertical direction will become smaller. At this time, the vibration amplitude detected by the sensing optical fiber is not accurate. To this end, the present invention sets two layers of front optical fiber segments, first calculates the vertical distance between the first bracket and the sewage pipe, and pre-stores the corresponding relationship between the amplitude measured at the initial orthogonal measurement point and the sewage discharge amount at different vertical distances in the remote monitoring device, wherein the initial orthogonal measurement point is the orthogonal point on the corresponding layer of the front optical fiber with the sewage pipe. After calculating the vertical distance, the corresponding relationship between the amplitude measured at the initial orthogonal measurement point and the sewage discharge amount can be first found according to the vertical distance, and then the sewage discharge amount corresponding to the amplitude can be determined according to the amplitude measured at the initial orthogonal measurement point.

[0029] Specifically, when only the vertical displacement of the first bracket is considered, the present invention provides an automatic monitoring method for a sewage channel, and the remote monitoring device can monitor the sewage discharge according to the following steps:

[0030] Step S110, sending a laser signal to the sensing optical fiber, and for each first bracket, after receiving the laser signal, its sensing optical fiber transmits the backscattered light signal in reverse to the remote monitoring device; the remote monitoring device determines the amplitude of each measuring point on the two layers of front optical fiber segments of the sensing optical fiber based on the backscattered light signal.

[0031] Step S120: According to the magnitude relationship of the amplitudes of the respective measuring points on the first layer of the front optical fiber segment, two measuring points with the same amplitude on the first layer of the front optical fiber segment are determined: a first measuring point Q1 and a second measuring point Q2, wherein a point on the second layer of the front optical fiber segment that is vertically opposite to the first measuring point Q1 is taken as a third measuring point Q3, and a point on the second layer of the front optical fiber segment that is vertically opposite to the second measuring point Q2 is taken as a fourth measuring point Q4.

[0032] Step S130, for each pair of measurement points vertically facing each other on the two layers of front optical fiber segments, substitute the amplitude of the pair of measurement points and the vertical distance between the two layers of front optical fiber segments into the vibration longitudinal wave attenuation model of the sewage pipe in the vertical direction to determine whether the vibration longitudinal wave attenuation model is established; if so, use the pair of measurement points as the current orthogonal measurement points on the corresponding layer of front optical fiber segments, and the current orthogonal measurement points are located directly above the sewage pipe.

[0033] In this step, since the sewage pipe will generate longitudinal waves propagating in the vertical direction and transverse waves propagating in the transverse direction when discharging sewage, for a pair of measurement points located directly above the sewage pipe on the two layers of front optical fiber segments, their attenuation must conform to the law of vibration longitudinal wave attenuation. Therefore, by substituting the amplitude of each pair of measurement points on the two layers of front optical fiber segments and the vertical distance between the two layers of front optical fiber segments into the vibration longitudinal wave attenuation model of the sewage pipe in the vertical direction, it can be identified which pair of measurement points is located directly above the sewage pipe.

[0034] Step S140, establishing a set of equations according to the amplitudes measured at the four measuring points Q1-Q4 and the spatial geometric relationship between the four measuring points Q1-Q4 and the vibration source point, and calculating the vertical distance between the first bracket and the sewage pipe.

[0035] Combination Figure 3 and Figure 4 As shown, the step S140 may specifically include:

[0036] Step S141: The vibration sources of the four measuring points Q1 to Q4 are the same, namely, the vibration source Q5. Assume that the distance between the first measuring point Q1 and the second measuring point Q2 and the vibration source point Q5 is D. 01 The distance between the third measuring point Q3 and the fourth measuring point Q4 and the vibration source point Q5 is D 02 , the amplitude of the vibration source point is B 0 , the amplitudes measured at the first measuring point Q1 and the second measuring point Q2 are A 1 , the amplitude measured at the third measuring point Q3 and the fourth measuring point Q4 is A 2 , where D 01 , D 02 and B 0 These three parameters are unknown parameters. 1 and A 2 Known,

[0037] For the first measurement point Q1, A 1 , B 0 and D 01 Substituting into the vibration shear wave attenuation model of the sewage pipe in the lateral direction, a first equation is formed;

[0038] For the third measurement point Q3, A 2 , B 0 and D 02 Substitute it into the vibration shear wave attenuation model of the sewage pipe in the lateral direction to form the second equation.

[0039] In this step, since this embodiment only considers the vertical displacement of the first bracket, the front optical fiber segment is always orthogonal to the sewage pipe, the first measuring point Q1 and the second measuring point Q2 are symmetrical relative to the sewage pipe, the third measuring point Q3 is located directly below the first measuring point Q1, and the fourth measuring point Q4 is located directly below the second measuring point Q2, so the vibration sources of the four measuring points Q1 to Q4 are the same.

[0040] Step S142: Assume that the vertical distance from the lower layer front optical fiber segment to the vibration source point Q5 is h, and the horizontal distance from the four measurement points Q1 to Q4 to the vibration source point Q5 is the distance x between the four measurement points Q1 to Q4 and the current orthogonal measurement point Q8 of the layer where they are located. 0 , the vertical distance between the two layers of front optical fiber segments is L, where h is an unknown parameter, L and X 0 It is known that according to the spatial geometric relationship between the first measuring point Q1, the third measuring point Q3 and the vibration source point Q5, the following equation is established:

[0041] D 01 2 =(L+h) 2 +X0 2 (1)

[0042] D 02 2 =h 2 +X 0 2 (2)

[0043] Step S143: Combine the first equation to the second equation, and equations (1) and (2) to find the vertical distance h between the first bracket and the sewage pipe. Since there are four unknown parameters in the above formula, these four unknown parameters can be solved by establishing four equations.

[0044] Step S150: Determine the sewage discharge volume of the sewage pipe according to the vertical distance.

[0045] In this step, the remote monitoring device can locally store the amplitude that can be measured at the current orthogonal measurement point on the front optical fiber segment under different sewage discharge amounts for each vertical distance when the first bracket is only displaced in the vertical direction. The step S150 can specifically include: according to the vertical distance, finding out the amplitude that can be measured at the current orthogonal measurement point on the front optical fiber segment of the first bracket under different sewage discharge amounts; comparing the amplitude actually measured at the current orthogonal measurement point on the front optical fiber segment with the found amplitude, so as to determine the sewage discharge amount corresponding to the actually measured amplitude.

[0046] It can be seen from the above embodiments that the present invention can reduce the risk of damage to the sewage discharge detection device by monitoring the sewage discharge of the sewage pipe using the sensing optical fiber bought into the soil. In addition, the present invention is provided with two layers of front optical fiber segments that are vertically opposite to each other. According to the size relationship of the amplitudes of each measuring point on one layer of the front optical fiber segments, the amplitudes measured at the corresponding measuring points on the two layers of the front optical fiber segments, and the spatial geometric relationship between the corresponding measuring points and their vibration source points, the vertical distance between the first bracket and the sewage pipe is calculated, and the sewage discharge of the sewage pipe is determined based on the vertical distance, thereby improving the accuracy of sewage discharge measurement.

[0047] Although determining the discharge volume based on the vertical distance can improve the accuracy of the discharge volume measurement, as the external environment changes, the first bracket may not only shift in the vertical direction, but may also shift in the front-to-back direction of the discharge pipe and in the left-to-right direction perpendicular to the discharge pipe. When the first bracket shifts in the front-to-back and / or left-to-right direction, if the discharge volume of the discharge pipe is still determined based on the amplitude measured at the initial orthogonal measurement point on the front optical fiber segment that is orthogonal to the discharge pipe, the discharge volume determination will be seriously inaccurate. For this reason, the present invention also adds a second bracket.

[0048] See also Figure 5, is a top view of another embodiment of the automatic monitoring system for sewage discharge channels of the present invention. Figure 6 As shown in (a) and (b), Figure 5 and Figure 1 The difference of the illustrated embodiment is that it also includes a second bracket 7 arranged for each sewage pipe, and the second bracket 7 has the same structure as the first bracket 2. The second bracket 7 is fixedly connected to the sewage pipe 1 and is located in front of the first bracket 2. After the sensing optical fiber 3 passes through the other end of the first supporting tube 4 of the first bracket 2, it passes through the first supporting tube 4 of the second bracket 7, and then passes through the first through hole at the fixed position of the first supporting tube 4 and the second supporting tube 5, and is wound twice between the second supporting tube 5 and the third supporting tube 6 so that two layers of front optical fiber segments vertically facing each other are formed between the second supporting tube 5 and the third supporting tube 6, and then passes through the first supporting tube 4 and passes through the other end of the first supporting tube 4; the sensing optical fiber 3 is fixedly connected to the two ends of the first supporting tube 4 respectively, and the front optical fiber segments formed on the second bracket 7 are arranged horizontally from left to right and are orthogonal to the sewage pipe 1; a sensing optical fiber with a set margin is left between the second bracket 7 and the first bracket 2.

[0049] In this embodiment, the second bracket 7 can be fixed at a position on the sewage pipe where no vibration occurs, and the front optical fiber segment on the reference bracket 7 is placed directly above the position on the sewage pipe where vibration may occur. This can reduce the impact of the second bracket 7 fixed to the sewage pipe 1 on the amplitude measurement of the front optical fiber segment. Of course, the second bracket 7 can also be fixed at a position on the sewage pipe where vibration occurs, but the amplitude measured by the amplitude of its front optical fiber segment needs to be compensated.

[0050] Since the present embodiment simultaneously considers the displacement of the first bracket in the vertical direction, the left-right direction, and the front-back direction, the present invention provides an automatic monitoring method for a sewage discharge channel, and the remote monitoring device can monitor the sewage discharge volume according to the following steps:

[0051] Step S110, sending a laser signal to the sensing optical fiber, and for each first bracket, after receiving the laser signal, the sensing optical fiber transmits the backscattered light signal in reverse to the remote monitoring device; the remote monitoring device determines the amplitude of each measuring point on the two layers of the front optical fiber segment of the sensing optical fiber according to the backscattered light signal;

[0052] Step S120: according to the magnitude relationship of the amplitudes of the respective measurement points on the first layer of the front optical fiber segment, determine two measurement points on the first layer of the front optical fiber segment with the same amplitude: a first measurement point Q1 and a second measurement point Q2, wherein a point on the second layer of the front optical fiber segment that is vertically opposite to the first measurement point Q1 is used as a third measurement point Q3, and a point on the second layer of the front optical fiber segment that is vertically opposite to the second measurement point Q2 is used as a fourth measurement point Q4;

[0053] Step S130: for each pair of measurement points vertically facing each other on the two layers of front optical fiber segments, the amplitude of the pair of measurement points and the vertical distance between the two layers of front optical fiber segments are substituted into the vibration longitudinal wave attenuation model of the sewage pipe in the vertical direction to determine whether the vibration longitudinal wave attenuation model is established; if so, the pair of measurement points are respectively used as current orthogonal measurement points on the corresponding layer of front optical fiber segments, and the current orthogonal measurement points are located directly above the sewage pipe;

[0054] Step S140, establishing a set of equations according to the amplitudes measured at the four measuring points Q1-Q4 and the spatial geometric relationship between the four measuring points Q1-Q4 and the vibration source point, and calculating the vertical distance between the first bracket and the sewage pipe.

[0055] Before the step S140, it also includes: judging whether the distances from the first measuring point Q1 and the second measuring point Q2 to the current orthogonal measuring point Q8 on the first layer of front optical fiber segment are equal, if they are equal, it indicates that the first bracket may be displaced relative to the sewage pipe (including the possibility of displacement in the left-right direction and / or the front-back direction, and the possibility of no displacement in the left-right direction and the front-back direction), but the two layers of front optical fiber segments still remain orthogonal to the sewage pipe, and the vibration sources of the four measuring points Q1 to Q4 are the same, firstly executing step S140, then executing step S170 of determining the moving distance of the first bracket in the left-right direction, and step S190 of determining the moving distance of the first bracket in the front-back direction, and finally executing step S150; otherwise, it indicates that the first bracket is displaced relative to the sewage pipe, and the two layers of front optical fiber segments are no longer orthogonal to the sewage pipe, and step S160 is executed.

[0056] The step S140 specifically includes: step S141, the vibration sources of the four measuring points Q1 to Q4 are the same, which are all vibration sources Q5, and the distances between the first measuring point Q1 and the second measuring point Q2 and the vibration source point Q5 are assumed to be D 01 The distance between the third measuring point Q3 and the fourth measuring point Q4 and the vibration source point Q5 is D 02 , the amplitude of the vibration source point is B 0 , the amplitudes measured at the first measuring point Q1 and the second measuring point Q2 are A 1 , the amplitude measured at the third measuring point Q3 and the fourth measuring point Q4 is A 2 , where D 01 , D 02 and B 0 These three parameters are unknown parameters. 1 and A 2 Known,

[0057] For the first measurement point Q1, A 1 , B 0 and D 01 Substituting into the vibration shear wave attenuation model of the sewage pipe in the lateral direction, a first equation is formed;

[0058] For the third measurement point Q3, A 2 , B 0 and D 02 Substituting into the vibration shear wave attenuation model of the sewage pipe in the lateral direction, a second equation is formed;

[0059] Step S142: Assume that the vertical distance from the lower layer front optical fiber segment to the vibration source point Q5 is h. The vibration source points of the four measurement points Q1 to Q4 are the same. The horizontal distances from the four measurement points to their vibration source point Q5 are the distances x between the four measurement points Q1 to Q4 and the current orthogonal measurement point Q3 of the layer where they are located. 0 , the vertical distance between the two layers of front optical fiber segments is L, where h is an unknown parameter, L and X 0 It is known that according to the spatial geometric relationship between the first measuring point Q1, the third measuring point Q3 and the vibration source point Q5, the following equation is established:

[0060] D 01 2 =(L+h) 2 +X 0 2 (1)

[0061] D 02 2 =h 2 +X 0 2 (2)

[0062] Step S143, combine the first equation to the second equation, and equations (1) and (2) to calculate the vertical distance h between the first bracket and the sewage pipe.

[0063] Assume that in the initial state, the orthogonal point on the two layers of front optical fiber segments and the sewage pipe is the initial orthogonal measurement point Q0; the step S170 includes: taking the distance between the initial orthogonal measurement point Q0 of the corresponding layer and the current orthogonal measurement point Q3 as the moving distance of the first bracket in the left and right direction.

[0064] Step S150: Determine the sewage discharge volume of the sewage pipe according to the vertical distance.

[0065] In this step, the remote monitoring device can locally store the amplitudes measurable at the current orthogonal measurement point on the front optical fiber segment of the first bracket at different sewage discharge amounts for each vertical distance when the first bracket is only displaced in the vertical direction. In addition, the remote monitoring device locally stores the amplitudes measured at the initial orthogonal measurement point on the front optical fiber segment of the second bracket at different sewage discharge amounts.

[0066] The step S150 may specifically include: determining whether the moving distance of the first bracket in the left-right direction and the front-back direction is 0; if it is 0, finding out, based on the vertical distance, the amplitude that can be measured at the current orthogonal measurement point on the front optical fiber segment of the first bracket under different sewage discharge amounts; comparing the amplitude actually measured at the current orthogonal measurement point on the front optical fiber segment with the found amplitude, so as to determine the sewage discharge amount corresponding to the actually measured amplitude; otherwise, determining the sewage discharge amount of the sewage pipe based on the amplitude of the initial orthogonal measurement point on the front optical fiber segment of the second bracket.

[0067] Step S160, based on the amplitudes measured at the four measuring points Q1~Q4, the spatial geometric relationship between the four measuring points Q1~Q4 and their vibration source points, and the determined distances from the two measuring points Q1~Q2 to the current orthogonal measuring point Q8 on the first layer of front optical fiber segment, establish a group of equations to calculate the vertical distance between the first bracket and the sewage pipe, then execute step S180 of determining the moving distance of the first bracket in the left and right direction, and step S190 of determining the moving distance of the first bracket in the front and rear directions, and finally execute step S150.

[0068] Combination Figure 7 and Figure 8 As shown, the vibration shear wave propagation line passing through the first measuring point Q1 and the third measuring point Q3 and the orthogonal intersection point with the sewage pipe are used as the first vibration source point Q6 of the first measuring point Q1 and the third measuring point Q3, and the vibration shear wave propagation line passing through the second measuring point Q2 and the fourth measuring point Q4 and the orthogonal intersection point with the sewage pipe are used as the second vibration source point Q7 of the second measuring point Q2 and the fourth measuring point Q4; the step S160 may specifically include:

[0069] Step S161: Figure 8 As shown, the distances between the first measuring point Q1 and the third measuring point Q3 and the first vibration source point Q6 are D 1 and D 3 The distances between the second measuring point Q2 and the fourth measuring point Q4 and the second vibration source point Q7 are D 2 and D 4 The amplitudes of the first vibration source point and the second vibration source point are B 1 and B2 The amplitudes measured at the four measurement points Q1 to Q4 are A 3 , A 4 , A 5 and A 6 , where D 1 , D 2 , D 3 , D 4 , B 1 and B 2 These six parameters are unknown parameters. 3 , A 4 , A 5 and A 6 known;

[0070] For the first measurement point Q1, A 3 , B 1 and D 1 Substituting into the vibration shear wave attenuation model of the sewage pipe in the lateral direction to form a third-party formula;

[0071] For the second measurement point Q2, A 4 , B 2 and D 2 Substituting into the vibration shear wave attenuation model of the sewage pipe in the lateral direction, a fourth equation is formed;

[0072] For the third measurement point Q3, A 5 , B 1 and D 3 Substituting into the vibration shear wave attenuation model of the sewage pipe in the lateral direction, a fifth equation is formed;

[0073] For the fourth measurement point Q4, A 6 , B 2 and D 4 Substituting into the vibration shear wave attenuation model of the sewage pipe in the lateral direction, a sixth equation is formed;

[0074] Step S162: Figure 8 As shown, the vertical distance from the lower front optical fiber segment to the first vibration source point Q6 or the second vibration source point Q7 is hx, and the lateral distance from the first measurement point Q1 and the third measurement point Q3 to the first vibration source point Q6 is x. 1 The lateral distance from the second measuring point Q2 and the fourth measuring point Q4 to the second vibration source point Q7 is X 2 , the vertical distance between the two layers of front optical fiber segments is L, where hx, X 1 and X 2 These three parameters are unknown, L is known, and the following equation is established based on the spatial geometric relationship between the four measurement points and their vibration source points:

[0075] D 1 2 =(L+hx) 2 +X 1 2 (3)

[0076] D 3 2 =hx 2 +X 1 2 (4)

[0077] D 2 2 =(L+hx) 2 +X 2 2 (5)

[0078] D 4 2 =hx 2 +X 2 2 (6)

[0079] Step S163: Figure 7 As shown, suppose the distances from the first measuring point Q1 and the second measuring point Q2 to the current orthogonal measuring point Q8 on the first layer of the front optical fiber segment are P 1 and P 2 , P 1 and P 2 Known, establish the following equation: X 1 / X 2 =P 1 / (P 1 +P 2 )(7)

[0080] Step S164: Combine the third-party equation to the sixth equation and equations (3) to (7) to find the vertical distance hx between the first bracket and the sewage pipe. Since there are nine unknown parameters in the above equation group, and there are nine equations in the equation group, these nine unknown parameters can be solved by establishing nine equations.

[0081] In the step S160, according to the equation group, the lateral distance from the first measuring point Q1 to its corresponding first vibration source point Q6 is calculated as X 1 The lateral distance from the second measuring point Q2 to its corresponding second vibration source point Q7 is X 2 ;

[0082] The step S180 includes: determining on which side of the current orthogonal measurement point Q8 the initial orthogonal measurement point Q1 is located after the first bracket is displaced, taking the first measurement point Q1 or the second measurement point Q2 corresponding to the side where the initial orthogonal measurement point Q1 is located as a reference measurement point, and assuming that the distance between the reference measurement point and the current orthogonal measurement point Q8 is P 4 , P 4 Equal to P 1 or P 2 The lateral distance between the reference measurement point and its vibration source point is X 4 , X 4 Equal to X 1 or X 2 , assuming that the distance between the current orthogonal measurement point Q8 and the initial orthogonal measurement point Q0 is P 3 , the lateral distance X from the initial orthogonal measurement point Q0 to the sewage pipe 3 =(X 4 *P 3 ) / P 4 , the lateral distance X 3 is the moving distance of the first bracket in the left-right direction.

[0083] The remote monitoring device locally stores the amplitudes measured at the initial orthogonal measurement points on the front optical fiber segment of the second bracket at different sewage discharge rates. For each vertical distance, the remote monitoring device also locally stores the amplitudes that can be measured at different sewage discharge rates at each position of the vertical distance directly above the sewage pipe. The step S190 may include:

[0084] Step S191, determining the sewage discharge amount of the sewage discharge pipe according to the amplitude of the initial orthogonal measurement point on the front optical fiber segment of the second bracket;

[0085] Step S192, finding out the amplitude that can be measured at each position of the vertical distance directly above the sewage pipe at the determined sewage discharge amount under the determined vertical distance;

[0086] Step S193, determine the amplitude actually measured at the current orthogonal measurement point on a layer of the front optical fiber segment of the first bracket, compare the actually measured amplitude with the found amplitude, determine the position of the sewage pipe directly above the current orthogonal measurement point in the front-to-back direction, and determine the moving distance of the first bracket in the front-to-back direction based on the initial position and current position of the current orthogonal measurement point in the front-to-back direction.

[0087] After determining the vertical distance between the first bracket and the sewage pipe and the moving distance of the first bracket in the left-right direction and the front-back direction, it can also include: monitoring the external environment of the sewage channel according to the vertical distance between the first bracket and the sewage pipe and the moving distance of the first bracket in the left-right direction and the front-back direction.

[0088] As can be seen from the above embodiments, the present invention can reduce the risk of damage to the sewage discharge detection device by monitoring the sewage discharge volume of the sewage pipe by using the sensing optical fiber bought into the soil. In addition, the present invention is provided with two layers of front optical fiber segments facing each other vertically. According to the magnitude relationship of the amplitude of each measuring point on one layer of the front optical fiber segment, the amplitude measured by the corresponding measuring point on the two layers of the front optical fiber segment, and the spatial geometric relationship between the corresponding measuring point and its vibration source point, the vertical distance between the first bracket and the sewage pipe is calculated, and the sewage discharge volume of the sewage pipe is determined according to the vertical distance, so that the accuracy of sewage discharge measurement can be improved. The present invention can also measure the moving distance of the first bracket in the left and right direction, and by adding a second bracket, the moving distance of the first bracket in the front and back direction can also be measured. According to the vertical distance between the first bracket and the sewage pipe, the moving distance of the first bracket in the left and right direction and the front and back direction, the relative position change of the first bracket can be determined. According to the relative position change of the first bracket, the external environment change of the river channel can be monitored, such as riverbed / river bank structure deformation / collapse / settlement and illegal construction.

[0089] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0090] It will be appreciated that the invention is not limited to the precise construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from its scope. The scope of the invention is governed solely by the appended claims.

Claims

1. An automatic monitoring system for sewage discharge channels, It is characterized in that It includes a first bracket and a sensing optical fiber set for each sewage pipe, the sewage pipe is set in front and behind, the first bracket is located directly above the sewage pipe and laid in the soil, wherein each first bracket includes a first support tube and a second support tube and a third support tube respectively fixedly connected to the first support tube, the sensing optical fibers in each first bracket are connected in sequence and then connected to a remote monitoring device, for each first bracket, one end of its sensing optical fiber is inserted from one end of the first support tube, and then passes through a first through hole at a fixed position of the first support tube and the second support tube, and is wound twice between the second support tube and the third support tube to form two layers of front optical fiber segments vertically facing each other between the second support tube and the third support tube, and then is inserted into the first support tube and passes through the other end of the first support tube, the sensing optical fiber is respectively fixedly connected to the two ends of the first support tube, the vertical distances of the two layers of front optical fiber segments to the sewage pipe are different, and in the initial state, the two layers of front optical fiber segments are arranged horizontally left and right and are orthogonal to the sewage pipe; The remote monitoring device sends a laser signal to the sensing optical fiber. For each sensing optical fiber, after receiving the laser signal, the sensing optical fiber transmits the backscattered light signal back to the remote monitoring device. The remote monitoring device determines the amplitude of each measuring point on the two layers of front optical fiber segments of the sensing optical fiber according to the backscattered light signal, and establishes a group of equations according to the size relationship of the amplitudes of each measuring point on one layer of the front optical fiber segment, the amplitudes measured at the corresponding measuring points on the two layers of the front optical fiber segments, and the spatial geometric relationship between the corresponding measuring points and their vibration source points to calculate the vertical distance between the first bracket and the sewage pipe; and determines the sewage discharge volume of the sewage pipe according to the vertical distance.

2. The automatic monitoring system for sewage discharge channels according to claim 1, It is characterized in that The free ends of the second support tube and the third support tube are provided with two pairs of through holes arranged opposite to each other, wherein the first pair of through holes is located directly above the second pair of through holes, and in the initial state, the two pairs of through holes are arranged in a direction perpendicular to the direction of the sewage pipe; after the sensing optical fiber passes through the first through hole, it passes through the first pair of through holes from the outside of the second support tube, and then passes through the second pair of through holes from the outside of the third support tube; after the sensing optical fiber passes through the second pair of through holes, it passes into the first through hole, and finally is arranged along the first support tube and passes through the other end of the first support tube; The first support tube, the second support tube and the third support tube are always on the same plane.

3. The automatic monitoring system for sewage discharge channels according to claim 1 or 2, It is characterized in that It also includes a second bracket set for each sewage pipe. The second bracket has the same structure as the first bracket. The second bracket is fixedly connected to the sewage pipe and is located in front of the first bracket. After the sensing optical fiber passes through the other end of the first supporting tube of the first bracket, it passes through the first supporting tube of the second bracket, and then passes through the first through hole at the fixed position of the first supporting tube and the second supporting tube, and is wound twice between the second supporting tube and the third supporting tube to form two layers of front optical fiber segments vertically facing each other between the second supporting tube and the third supporting tube, and then passes through the first supporting tube and passes through the other end of the first supporting tube; the front optical fiber segments formed on the second bracket are arranged horizontally left and right and are orthogonal to the sewage pipe; a set margin of sensing optical fiber is left between the second bracket and the first bracket.

4. A monitoring method for the automatic monitoring system for sewage discharge channels according to any one of claims 1 to 3, It is characterized in that The remote monitoring device monitors the discharge volume according to the following steps: Step S110, sending a laser signal to the sensing optical fiber, and for each first bracket, after receiving the laser signal, the sensing optical fiber transmits the backscattered light signal in reverse to the remote monitoring device; the remote monitoring device determines the amplitude of each measuring point on the two layers of the front optical fiber segment of the sensing optical fiber according to the backscattered light signal; Step S120: according to the magnitude relationship of the amplitudes of the respective measurement points on the first layer of the front optical fiber segment, determine two measurement points on the first layer of the front optical fiber segment with the same amplitude: a first measurement point Q1 and a second measurement point Q2, wherein a point on the second layer of the front optical fiber segment that is vertically opposite to the first measurement point Q1 is used as a third measurement point Q3, and a point on the second layer of the front optical fiber segment that is vertically opposite to the second measurement point Q2 is used as a fourth measurement point Q4; Step S130: for each pair of measurement points vertically facing each other on the two layers of front optical fiber segments, the amplitude of the pair of measurement points and the vertical distance between the two layers of front optical fiber segments are substituted into the vibration longitudinal wave attenuation model of the sewage pipe in the vertical direction to determine whether the vibration longitudinal wave attenuation model is established; if so, the pair of measurement points are respectively used as current orthogonal measurement points on the corresponding layer of front optical fiber segments, and the current orthogonal measurement points are located directly above the sewage pipe; Step S140, establishing a set of equations according to the amplitudes measured at the four measuring points Q1-Q4 and the spatial geometric relationship between the four measuring points Q1-Q4 and the vibration source point, and calculating the vertical distance between the first bracket and the sewage pipe; Step S150: Determine the sewage discharge volume of the sewage pipe according to the vertical distance.

5. The monitoring method according to claim 4, It is characterized in that Before the step S140, it also includes: judging whether the distances from the first measuring point Q1 and the second measuring point Q2 to the current orthogonal measuring point Q8 on the first layer of front optical fiber segment are equal, if they are equal, it means that the first bracket may be displaced relative to the sewage pipe, but the two layers of front optical fiber segments still remain orthogonal to the sewage pipe, and the vibration sources of the four measuring points Q1 to Q4 are the same, firstly executing step S140, then executing step S170 of determining the moving distance of the first bracket in the left-right direction, and step S190 of determining the moving distance of the first bracket in the front-back direction, and finally executing step S150; otherwise, it means that the first bracket is displaced relative to the sewage pipe, and the two layers of front optical fiber segments are no longer orthogonal to the sewage pipe, and executing step S160; Step S160, based on the amplitudes measured at the four measuring points Q1~Q4, the spatial geometric relationship between the four measuring points Q1~Q4 and their vibration source points, and the determined distances from the two measuring points Q1~Q2 to the current orthogonal measuring point Q8 on the first layer of front optical fiber segment, establish a group of equations to calculate the vertical distance between the first bracket and the sewage pipe, then execute step S180 of determining the moving distance of the first bracket in the left and right direction, and step S190 of determining the moving distance of the first bracket in the front and rear directions, and finally execute step S150.

6. The monitoring method according to claim 4 or 5, It is characterized in that The step S140 specifically includes: step S141, the vibration sources of the four measuring points Q1 to Q4 are the same, which are all vibration sources Q5, and the distances between the first measuring point Q1 and the second measuring point Q2 and the vibration source point Q5 are assumed to be D 01 The distance between the third measuring point Q3 and the fourth measuring point Q4 and the vibration source point Q5 is D 02 , the amplitude of the vibration source point is B 0 , the amplitudes measured at the first measuring point Q1 and the second measuring point Q2 are A 1 , the amplitude measured at the third measuring point Q3 and the fourth measuring point Q4 is A 2 , where D 01 , D 02 and B 0 These three parameters are unknown parameters. 1 and A 2 Known, For the first measurement point Q1, A 1 , B 0 and D 01 Substituting into the vibration shear wave attenuation model of the sewage pipe in the lateral direction, a first equation is formed; For the third measurement point Q3, A 2 , B 0 and D 02 Substituting into the vibration shear wave attenuation model of the sewage pipe in the lateral direction, a second equation is formed; Step S142: Assume that the vertical distance from the lower layer front optical fiber segment to the vibration source point Q5 is h. The vibration source points of the four measurement points Q1 to Q4 are the same. The horizontal distances from the four measurement points to their vibration source point Q5 are the distances x between the four measurement points Q1 to Q4 and the current orthogonal measurement point Q3 of the layer where they are located. 0 , the vertical distance between the two layers of front optical fiber segments is L, where h is an unknown parameter, L and X 0 It is known that according to the spatial geometric relationship between the first measuring point Q1, the third measuring point Q3 and the vibration source point Q5, the following equation is established: D 01 2 =(L+h) 2 +X 0 2 (1) D 02 2 =h 2 +X 0 2 (2) Step S143, combine the first equation to the second equation, and equations (1) and (2) to calculate the vertical distance h between the first bracket and the sewage pipe.

7. The monitoring method according to claim 5, It is characterized in that The orthogonal intersection point of the vibration shear wave propagation line passing through the first measuring point Q1 and the third measuring point Q3 with the sewage pipe is used as the first vibration source point Q6 of the first measuring point Q1 and the third measuring point Q3, and the orthogonal intersection point of the vibration shear wave propagation line passing through the second measuring point Q2 and the fourth measuring point Q4 with the sewage pipe is used as the second vibration source point Q7 of the second measuring point Q2 and the fourth measuring point Q4; The step S160 specifically includes: Step S161: Assume that the distances between the first measuring point Q1 and the third measuring point Q3 and the first vibration source point Q6 are D 1 and D 3 The distances between the second measuring point Q2 and the fourth measuring point Q4 and the second vibration source point Q7 are D 2 and D 4 The amplitudes of the first vibration source point and the second vibration source point are B 1 and B 2 The amplitudes measured at the four measurement points Q1 to Q4 are A 3 , A 4 , A 5 and A 6 , where D 1 , D 2 , D 3 , D 4 , B 1 and B 2 These six parameters are unknown parameters. 3 , A 4 , A 5 and A 6 known; For the first measurement point Q1, A 3 , B 1 and D 1 Substituting into the vibration shear wave attenuation model of the sewage pipe in the lateral direction to form a third-party formula; For the second measurement point Q2, A 4 , B 2 and D 2 Substituting into the vibration shear wave attenuation model of the sewage pipe in the lateral direction, a fourth equation is formed; For the third measurement point Q3, A 5 , B 1 and D 3 Substituting into the vibration shear wave attenuation model of the sewage pipe in the lateral direction, a fifth equation is formed; For the fourth measurement point Q4, A 6 , B 2 and D 4 Substituting into the vibration shear wave attenuation model of the sewage pipe in the lateral direction, a sixth equation is formed; Step S162: Set the vertical distance from the lower front optical fiber segment to the first vibration source point Q6 or the second vibration source point Q7 as hx, and the lateral distance from the first measurement point Q1 and the third measurement point Q3 to the first vibration source point Q6 as x. 1 The lateral distance from the second measuring point Q2 and the fourth measuring point Q4 to the second vibration source point Q7 is X 2 , the vertical distance between the two layers of front optical fiber segments is L, where hx, X 1 and X 2 These three parameters are unknown, L is known, and the following equation is established based on the spatial geometric relationship between the four measurement points and their vibration source points: D 1 2 =(L+hx) 2 +X 1 2 (3) D 3 2 =hx 2 +X 1 2 (4) D 2 2 =(L+hx) 2 +X 2 2 (5) D 4 2 =hx 2 +X 2 2 (6) Step S163: Assume that the distances from the first measuring point Q1 and the second measuring point Q2 to the current orthogonal measuring point Q8 on the first layer of the front optical fiber segment are P and 1 and P 2 , P 1 and P 2 Known, establish the following equation: X 1 / X 2 =P 1 / (P 1 +P 2 )(7) Step S164, combine the third-party equation to the sixth equation, and equations (3) to (7) to calculate the vertical distance hx between the first bracket and the sewage pipe.

8. The monitoring method according to claim 5, It is characterized in that Assume that in the initial state, the orthogonal point on the two layers of front optical fiber segments and the sewage pipe is the initial orthogonal measurement point Q0; The step S170 includes: taking the distance between the initial orthogonal measurement point Q0 of the corresponding layer and the current orthogonal measurement point Q3 as the moving distance of the first bracket in the left-right direction; In the step S160, according to the equation group, the lateral distance from the first measuring point Q1 to its corresponding first vibration source point Q6 is calculated as X 1 The lateral distance from the second measuring point Q2 to its corresponding second vibration source point Q7 is X 2 ; The step S180 includes: determining on which side of the current orthogonal measurement point Q8 the initial orthogonal measurement point Q1 is located after the first bracket is displaced, taking the first measurement point Q1 or the second measurement point Q2 corresponding to the side where the initial orthogonal measurement point Q1 is located as a reference measurement point, and assuming that the distance between the reference measurement point and the current orthogonal measurement point Q8 is P 4 , P 4 Equal to P 1 or P 2 The lateral distance between the reference measurement point and its vibration source point is X 4 , X 4 Equal to X 1 or X 2 , assuming that the distance between the current orthogonal measurement point Q8 and the initial orthogonal measurement point Q0 is P 3 , the lateral distance X from the initial orthogonal measurement point Q0 to the sewage pipe 3 =(X 4 *P 3 ) / P 4 , the lateral distance X 3 is the moving distance of the first bracket in the left-right direction.

9. The monitoring method according to claim 8, It is characterized in that The remote monitoring device locally stores the amplitudes measured at the initial orthogonal measurement points on the front optical fiber segment of the second bracket at different sewage discharge rates. For each vertical distance, the remote monitoring device also locally stores the amplitudes that can be measured at different sewage discharge rates at various positions at the vertical distance directly above the sewage pipe. The step S190 includes: Step S191, determining the sewage discharge amount of the sewage discharge pipe according to the amplitude of the initial orthogonal measurement point on the front optical fiber segment of the second bracket; Step S192, finding out the amplitude that can be measured at each position of the vertical distance directly above the sewage pipe at the determined sewage discharge amount under the determined vertical distance; Step S193, determining the amplitude actually measured at the current orthogonal measurement point on a layer of the front optical fiber segment of the first bracket, comparing the actually measured amplitude with the found amplitude, determining which position of the sewage pipe the current orthogonal measurement point is directly above in the front-to-back direction, and determining the moving distance of the first bracket in the front-to-back direction according to the initial position and current position of the current orthogonal measurement point in the front-to-back direction; The remote monitoring device may locally store the amplitude that can be measured at the current orthogonal measurement point on the front optical fiber segment under different sewage discharge amounts for each vertical distance when the first bracket is only displaced in the vertical direction; the step S150 specifically includes: determining whether the moving distance of the first bracket in the left-right direction and the front-back direction is 0, and if it is 0, finding out the amplitude that can be measured at the current orthogonal measurement point on the front optical fiber segment of the first bracket under different sewage discharge amounts according to the vertical distance; comparing the amplitude actually measured at the current orthogonal measurement point on the front optical fiber segment with the found amplitude, so as to determine the sewage discharge amount corresponding to the actually measured amplitude; Otherwise, the sewage discharge amount of the sewage discharge pipe is determined according to the amplitude of the initial orthogonal measurement point on the front optical fiber segment of the second bracket.

10. The monitoring method according to claim 8 or 9, It is characterized in that Also includes: The external environment of the sewage channel is monitored based on the vertical distance between the first bracket and the sewage pipe and the moving distance of the first bracket in the left-right direction and the front-back direction.

Images