CN216925724U - Optical fiber point cloud storage tank liquid total amount testing device - Google Patents
Optical fiber point cloud storage tank liquid total amount testing device Download PDFInfo
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- CN216925724U CN216925724U CN202122895372.3U CN202122895372U CN216925724U CN 216925724 U CN216925724 U CN 216925724U CN 202122895372 U CN202122895372 U CN 202122895372U CN 216925724 U CN216925724 U CN 216925724U
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Abstract
The utility model provides a device for testing the total liquid amount of an optical fiber point cloud storage tank. According to the utility model, the bracket which is integrated with the optical fiber liquid level sensing unit and is matched and installed with the storage tank to be measured is arranged in the system, so that the problems that a large number of optical fiber liquid level measuring points are regularly distributed in the storage tank and definite spatial positions are given to the storage tank are solved, and the spatial accuracy of liquid level measurement is improved; the support can have a folding and retracting function, and the optical fiber liquid level sensing unit can be stretched together with the support, so that the support can be applied to occasions with small liquid storage tank openings; by adopting an all-optical method, no electric element such as resistance, capacitance and the like is adopted at a measuring end, the capability of resisting severe environments such as electromagnetic interference, corrosion, high temperature and low temperature and the like is strong, and the device is suitable for long-term long-distance continuous observation in severe environments.
Description
Technical Field
The utility model relates to the technical field of measurement and testing, in particular to a device for testing the total amount of liquid in an optical fiber point cloud storage tank.
Background
The liquid level sensor is a common instrument for measuring the depth or volume of liquid, and particularly in the use scene of liquid level measurement in a closed space (such as a storage tank), higher requirements are put on measurement accuracy and total quantity evaluation.
Level sensors include both direct and indirect measurement modalities. The indirect measurement such as pressure difference and float type, no matter the method of converting through a pressure formula or measuring the position of a floating object on the surface of the liquid, can introduce extra system errors, and the liquid level resolution ratio is lower. The traditional direct measurement type liquid level sensor mainly adopts capacitance type and photoelectric type, and the sensor has relatively large size and heavy weight. And is limited by the tolerance capability of general electronic components, and most of the electric sensors cannot be used continuously in harsh environments such as high and low temperature, strong chemical corrosion, strong electromagnetic interference and the like. The optical fiber liquid level sensor only comprises an optical fiber device and a simple mechanical structure, does not need to be powered, and does not need to consider the electrical performance of materials. When the liquid level sensor is used, the optical fiber liquid level sensor is usually placed in an environment to be measured, the optical fiber signal demodulator is placed outside a relatively mild environment to be measured, and the optical fiber signal demodulator and the environment to be measured are connected by adopting the optical cable, so that the measuring means is very suitable for measuring the liquid level in the harsh environment.
For the presently disclosed optical fiber liquid level sensor and the measurement system thereof, most cases only focus on how to realize optical fiber liquid level sensitivity, such as "photonic crystal optical fiber liquid level sensor and the sensing system formed by the same" (CN101957227B) proposed by wangting et al, and "michelson liquid level sensor and measurement method based on multimode interference and low temperature response" (CN109974814B) proposed by von willinglin et al; the distributed optical fiber multi-probe liquid level sensing system (CN206321307U) proposed by Zhongxie et al and the long-distance passive liquid level sensor based on distributed optical fiber (CN106595807A) proposed by Pengbu et al are fewer, and a basic implementation method of multi-point position measurement is introduced only from the aspect of the photoelectric technology, but for an optical fiber liquid level measurement system which usually adopts a large number of sensors and flexible optical cables, no case is given about how to make the measurement system more adapt to a space to be measured (such as a storage tank), so that the liquid level measurement result is inaccurate due to space reference difference. Secondly, no case has been given of a specific method for achieving total liquid quantity evaluation based on a large number of fiber optic point type liquid level sensors.
In carrying out the present invention, the applicant has found that: on one hand, the existing optical fiber liquid level measuring system for the storage tank does not provide a sensor and an optical cable arrangement method which can adapt to a space to be measured, so that the space reference has difference, and the liquid level measuring result is inaccurate; on the other hand, there is a lack of specific methods for achieving total liquid level assessment in tanks using a large number of fiber optic point level measurements.
Disclosure of Invention
The utility model provides a device for testing the total liquid amount of an optical fiber point cloud storage tank, aiming at solving the problems that the existing optical fiber liquid level measurement system for the storage tank does not provide a sensor which can adapt to a space to be tested, an optical cable arrangement method and a space reference have difference, so that the liquid level measurement result is inaccurate, and by arranging a bracket which is integrated with an optical fiber liquid level sensing unit and is matched and installed with the storage tank to be tested in the system, the problems that a large number of optical fiber liquid level measuring points are regularly distributed in the storage tank and are endowed with definite space positions relative to the storage tank are solved, and the space accuracy of liquid level measurement is improved; the support can have a folding and retracting function, and the optical fiber liquid level sensing unit can be stretched together with the support, so that the support can be applied to occasions with small liquid storage tank openings; by adopting an all-optical method, no electric elements such as resistance, capacitance and the like are adopted at the measuring end, the capability of resisting severe environments such as electromagnetic interference, corrosion, high temperature and low temperature and the like is strong, and the device is suitable for long-term long-distance continuous observation in severe environments.
The utility model provides a device for testing the total liquid amount of an optical fiber point cloud storage tank, which comprises a bracket arranged on the inner wall of the storage tank, a plurality of liquid level sensors which are arranged on the bracket and are coded with unique codes, and an optical cable connected with the liquid level sensors;
the bracket comprises a cable leading structure, a plurality of sensor mounting structures which are arranged on the cable leading structure and are coded with unique codes, a positioning connection structure and a cable dividing structure;
the cable leading structure is a tubular structure, and the sensor mounting structure is a hole which is arranged on the cable leading structure in a penetrating way;
the cable leading structure is divided into a plurality of rows which are arranged on the side surface and the top surface of the storage tank and converged to the cable dividing structure, the cable dividing structure is arranged in the center of the top surface of the storage tank, and the positioning and connecting structure is fixed on the top in the storage tank;
the starting end of the optical cable is connected with the liquid level sensor, and the optical cable is fixed in the middle or outside of the cable leading structure and converged to the cable distributing structure.
The utility model relates to a device for testing the total liquid amount in an optical fiber point cloud storage tank, which is a preferred mode, wherein a cable guiding structure is a hollow tube, the cable guiding structure comprises a cable guiding structure body, an inner tube space inside the cable guiding structure body and a first fixing auxiliary part filled in the inner tube space, the first fixing auxiliary part is foaming filler, and an optical cable is fixed in the inner tube space through the first fixing auxiliary part.
The utility model relates to a device for testing the total liquid amount of an optical fiber point cloud storage tank, which is a preferred mode, wherein a cable guiding structure is a solid pipe and comprises a cable guiding structure body, a thin cable guiding position and a second fixing auxiliary piece, wherein the thin cable guiding position is arranged on the surface of the cable guiding structure body, the second fixing auxiliary piece is fixed on the thin cable guiding position, the thin cable guiding position is the surface of the cable guiding structure body or a micro-groove arranged on the surface of the cable guiding structure body, the second fixing auxiliary piece is a binding tape, and an optical cable is fixed on the thin cable guiding position through the second fixing auxiliary piece.
The utility model relates to a device for testing the total liquid amount in an optical fiber point cloud storage tank, which is an optimal mode, wherein a cable leading structure is of a foldable structure, and a liquid level sensor and a sensor mounting structure are fixed in any mode as follows: screwing, welding, gluing and clamping.
The utility model relates to a device for testing the total liquid amount of an optical fiber point cloud storage box, which is used as an optimal mode, wherein the storage box and a positioning connecting structure are fixed in a magnetic attraction or connection or buckling mode;
the positioning connection structure is a magnet or iron.
The utility model relates to a device for testing the total liquid amount in an optical fiber point cloud storage tank, which is used as a preferred mode, wherein a liquid level sensor is an optical fiber type liquid level sensor, and the liquid level sensor comprises an optical fiber liquid level sensing element and a protection component arranged outside the optical fiber liquid level sensing element;
the optical cable comprises a thin optical cable connected with the optical fiber liquid level sensing element and a thick optical cable connected with the tail end of the thin optical cable;
the cable distributing structure comprises a thin cable distributing position and a thick cable fixing part arranged at the upper end of the thin cable distributing position, the thin cable distributing position is fixed outside the tail end of the thin optical cable and the starting end of the thick optical cable, and the thick cable distributing position is fixed inside the thick optical cable.
The utility model relates to a device for testing the total liquid amount of an optical fiber point cloud storage tank, which is used as an optimal mode, wherein a liquid sensing mode of an optical fiber liquid level sensing element is refractive index sensing, and a sensing structure is a fluorescent optical fiber; the sensing structure of the optical fiber liquid level sensing element is any one of the following structures: inclined grating, optical fiber Fabry-Perot interference cavity, fluorescent optical fiber and optical fiber head structure.
As an optimal mode, the liquid sensitive part of the optical fiber point cloud storage tank liquid total amount testing device extends out of the cable leading structure and is fixed outside the cable leading structure.
The utility model relates to a device for testing the total liquid amount of an optical fiber point cloud storage box, which is a preferred mode and further comprises an optical fiber signal demodulation unit connected with the tail end of an optical cable, wherein the optical fiber signal demodulation unit comprises an optical fiber plug, an optical switch, a light source, a photoelectric detector, a signal acquisition and processing circuit and a data transmission circuit, the optical fiber plug, the optical switch and the light source are sequentially and electrically connected, the photoelectric detector, the signal acquisition and processing circuit and the data transmission circuit are sequentially and electrically connected with the optical switch, and the optical fiber plug is electrically connected with the tail end of the optical cable.
The utility model relates to a device for testing the total liquid amount of an optical fiber point cloud storage tank, which is a preferred mode, wherein an optical fiber plug is a 128-core single plug, the end face of a plug core is an oblique 8-degree APC (automatic Power control), an optical switch is a 2-128-minute MEMS (micro-electromechanical systems) optical switch, a light source is a C + L waveband broadband laser light source, a photoelectric detector is a photodiode, and a signal acquisition and processing circuit is used for switching the channel of the optical switch.
The utility model provides a system for testing total liquid amount in an optical fiber point cloud storage tank, which comprises: the device comprises an optical fiber liquid level sensing unit, a bracket, an optical fiber signal demodulation unit and a liquid total calculating unit. The optical fiber liquid level sensing unit comprises a plurality of optical fiber point type liquid level sensors which are coded with unique codes and light transmission optical cables; the cable guide device comprises a support, a cable guide structure, a cable distribution structure and a positioning connection structure, wherein the support comprises a plurality of sensor mounting structures which are coded with unique codes, the cable guide structures, the cable distribution structures and the positioning connection structures are relatively fixed in spatial positions and have definite three-dimensional relative spatial coordinate values; the optical fiber signal demodulation unit has a function of judging whether each optical fiber liquid level sensor is immersed by liquid or not, and can output a judgment signal; the liquid total amount calculating unit has the function of acquiring judgment signals and can calculate the total amount of the liquid through the judgment signals; the connection mode of the optical fiber point cloud storage tank liquid total amount testing system is as follows: connecting the bracket with the storage tank to be tested through a positioning connection structure, so that the bracket and the storage tank are rigidly connected and the spatial positions of the bracket and the storage tank are relatively fixed; rigidly mounting the optical fiber point type liquid level sensors on corresponding sensor mounting structures according to the codes, so that each optical fiber point type liquid level sensor has a definite spatial position relative to the storage tank to be measured; the light transmission optical cable is led out of the bracket through the cable leading structure and the cable dividing structure and is connected with the optical fiber signal demodulation unit; and the optical fiber signal demodulation unit is connected with the liquid total amount calculation unit through a signal transmission line. The working mode of the optical fiber point cloud storage tank liquid total amount testing system is as follows: when liquid exists in the storage tank to be detected, the optical fiber signal demodulation unit obtains a judgment signal whether all the code optical fiber point type liquid level sensors are immersed by the liquid, the liquid total amount calculation unit extracts codes of all the immersed signals of the liquid, three-dimensional relative space coordinate values of the sensor mounting structure are combined to draw a three-dimensional space distribution point cloud of the immersed signals, the storage tank liquid shape envelope is obtained through extending topological operation, and then the liquid total amount is calculated.
The technical scheme of the utility model is as follows: a fiber point cloud storage tank liquid total amount testing system comprises: the device comprises an optical fiber liquid level sensing unit, a bracket, an optical fiber signal demodulation unit and a liquid total calculating unit.
The optical fiber liquid level sensing unit comprises a plurality of optical fiber point type liquid level sensors which are coded with unique codes and light transmitting optical cables;
the support comprises a plurality of sensor mounting structures which are coded with unique codes, a cable leading structure, a cable dividing structure and a positioning connecting structure, wherein the sensor mounting structures and the positioning connecting structure are relatively fixed in spatial position and have definite three-dimensional relative spatial coordinate values;
the optical fiber signal demodulation unit has a function of judging whether each optical fiber liquid level sensor is immersed by liquid or not, and can output a judgment signal;
the liquid total amount calculating unit has the function of acquiring judgment signals and can calculate the total amount of the liquid through the judgment signals;
the connection mode of the optical fiber point cloud storage tank liquid total amount testing system is as follows: connecting the bracket with the storage tank to be tested through a positioning connection structure, so that the bracket and the storage tank are rigidly connected and the spatial positions of the bracket and the storage tank are relatively fixed; the optical fiber point type liquid level sensors are rigidly mounted on corresponding sensor mounting structures according to codes, so that each optical fiber point type liquid level sensor has a definite spatial position relative to a storage tank to be measured; the light transmission optical cable is led out of the bracket through the cable leading structure and the cable dividing structure and is connected with the optical fiber signal demodulation unit; and the optical fiber signal demodulation unit is connected with the liquid total amount calculation unit through a signal transmission line.
The working mode of the optical fiber point cloud storage tank liquid total amount testing system is as follows: when liquid exists in the storage tank to be detected, the optical fiber signal demodulation unit obtains a judgment signal indicating whether all the code fiber point type liquid level sensors are immersed by the liquid, the liquid total amount calculation unit extracts codes of all the immersed signals, three-dimensional relative space coordinate values of the sensor mounting structure are combined to draw three-dimensional space distribution point clouds of the immersed signals, the storage tank liquid shape envelope is obtained through extended topology operation, and then the total amount of the liquid is calculated.
The liquid sensitive mode contained in the optical fiber point mode liquid level sensor in the optical fiber liquid level sensing unit is refractive index sensitive; the sensing structure can be a tilted grating, a fiber Fabry-Perot interference cavity, a fluorescent fiber or a fiber head structure.
The structure of a guide cable in the bracket is a rigid hollow tube structure, the sensor mounting structure is a hole structure penetrating through the inside and outside of the hollow tube structure, an optical fiber point type liquid level sensor and a light transmission optical cable in the optical fiber liquid level sensing unit enter the bracket through the hollow guide cable structure, and the liquid sensitive part of the optical fiber point type liquid level sensor is extended out of the guide cable structure and fixed through the sensor mounting structure; or the cable leading structure in the bracket is a rigid solid rod structure, the connection mode between the optical fiber point type liquid level sensor and the sensor mounting structure in the optical fiber liquid level sensing unit can be in screw joint, welding, adhesive joint or clamping, and the light transmitting optical cable is bound and fixed along the cable leading structure.
The bracket is of a foldable structure and is in a long and thin rod shape when being folded, so that the bracket can conveniently enter and exit a small storage tank opening, and the bracket can be unfolded in the storage tank to be measured when the liquid level is measured. The light transmission optical cable in the optical fiber liquid level sensing unit is flexible and can be synchronously retracted along with the support without influencing the optical performance of the support.
The optical fiber cables are divided into two forms by the cable dividing structure in the support, wherein a single multi-core thick optical cable is arranged outside the support, a plurality of single-core thin optical cables are arranged inside the support, and the cable dividing structure has the function of transitioning the two optical cable states.
The connection mode of the positioning connection structure in the bracket and the storage box to be tested is magnetic attraction, buckling or gluing, and the fixing mode is at least three-point fixing.
The optical fiber signal demodulation unit can comprise a light source, an optical fiber plug, an optical switch, a photoelectric detector, a signal acquisition and processing circuit and a data transmission circuit.
The optical fiber plug in the optical fiber signal demodulation unit is a single plug not less than the ferrule, and the end face of the ferrule is processed by adopting an oblique-degree APC process.
And the liquid total amount calculating unit comprises a data receiving circuit, a data processing circuit and data processing software.
The communication mode of the data sending circuit in the optical fiber signal demodulation unit and the data receiving circuit in the liquid total amount calculation unit is wireless communication, and the communication protocol is Wi-Fi, Zigbee, Bluetooth, IrDA or Li-Fi.
The communication mode of the data sending circuit in the optical fiber signal demodulation unit and the data receiving circuit in the liquid total amount resolving unit is wired communication, and the communication protocol is RS, CAN, TCP/IP or Base-FX.
The data processing software in the liquid total amount calculating unit at least comprises a three-dimensional space modeling calculation function of a storage tank to be measured and a support, a space point position calculation function of a sensor mounting structure corresponding to an extracted liquid immersed signal, a liquid shape envelope drawing calculation function and a liquid volume total amount calculation function.
The utility model has the following advantages:
(1) according to the utility model, the bracket which is integrated with the optical fiber liquid level sensing unit and is matched and installed with the storage tank to be measured is arranged in the system, so that the problems that a large number of optical fiber liquid level measuring points are regularly distributed in the storage tank and definite spatial positions are given to the storage tank are solved, and the spatial accuracy of liquid level measurement is improved;
(2) the bracket can have a folding and retracting function, and the optical fiber liquid level sensing unit can be stretched together with the bracket, so that the bracket can be applied to occasions with small liquid storage tank openings;
(3) the utility model adopts an all-optical method, the measuring end does not adopt any electric elements such as resistance, capacitance and the like, the capability of the utility model in severe environments such as electromagnetic interference resistance, corrosion resistance, high and low temperature resistance and the like is strong, and the utility model is suitable for long-term long-distance continuous observation in severe environments.
Drawings
FIG. 1 is a schematic structural diagram of a device for testing the total amount of liquid in a point cloud storage tank;
FIG. 2 is a schematic view of a liquid level sensor and an optical cable structure of a device for testing the total amount of liquid in a point cloud storage tank;
FIG. 3 is a schematic view of a cable distribution structure of a device for testing the total amount of liquid in a fiber point cloud storage tank;
FIG. 4 is a schematic structural diagram of a cable-branching optical fiber signal demodulating unit of a device for testing total liquid amount in an optical fiber point cloud storage tank;
FIG. 5 is a schematic view of the fixing of an optical cable in an embodiment 2 of a device for testing the total amount of liquid in a point cloud storage tank of an optical fiber;
FIG. 6 is a schematic view of the fixing of an optical cable in the embodiment 3 of the device for testing the total amount of liquid in a point cloud storage tank of an optical fiber.
Reference numerals:
1. a support; 11. a cable leading structure; 111. a cable guide structure body; 112. a tube inner space; 113. a first fixation aid; 114. a thin cable lead position; 115. a second fixation aid; 12. a sensor mounting structure; 13. positioning the connecting structure; 14. a cable splitting structure; 141. a thin cable branching position; 142. a thick cable fixing part; 2. a liquid level sensor; 21. an optical fiber liquid level sensing element; 22. a protection component; 3. an optical cable; 31. a thin optical cable; 32. a thick optical cable; 4. an optical fiber signal demodulation unit; 41. an optical fiber plug; 42. an optical switch; 43. a light source; 44. a photodetector; 45. a signal acquisition and processing circuit; 46. and a data transmission circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1
As shown in fig. 1, the device for testing the total amount of liquid in the optical fiber point cloud storage tank comprises a bracket 1 arranged on the inner wall of the storage tank, a plurality of liquid level sensors 2 arranged on the bracket 1 and coded with unique codes, an optical cable 3 connected with the liquid level sensors 2 and an optical fiber signal demodulation unit 4 connected with the tail end of the optical cable 3;
the support 1 comprises a cable leading structure 11, a plurality of sensor mounting structures 12 which are arranged on the cable leading structure 11 and are coded with unique codes, a positioning connection structure 13 and a cable distributing structure 14;
the cable leading structure 11 is a tubular structure, and the sensor mounting structure 12 is a hole which is arranged on the cable leading structure 11 in a penetrating way;
the cable leading structure 11 is divided into a plurality of rows and arranged on the side surface and the top surface of the storage tank and converged to the cable dividing structure 14, the cable dividing structure 14 is arranged in the center of the top surface of the storage tank, and the positioning and connecting structure 13 is fixed on the top in the storage tank;
the starting end of the optical cable 3 is connected with the liquid level sensor 2, and the optical cable 3 is fixed in the middle or outside of the cable leading structure 11 and converged to the cable dividing structure 14;
as shown in fig. 2, the optical cable 3 includes a thin optical cable 31 connected to the optical fiber level sensing element 21 and a thick optical cable 32 connected to an end of the thin optical cable 31;
as shown in fig. 3, the cable distribution structure 14 includes a thin cable distribution position 141 and a thick cable fixing part 142 disposed at an upper end of the thin cable distribution position 141, the thin cable distribution position 141 is fixed at an end of the thin cable 31 and an outer portion of a start end of the thick cable 32, and the thick cable distribution position 142 is fixed at an inner portion of the thick cable 32;
the cable guiding structure 11 is a hollow tube, the cable guiding structure 11 includes a cable guiding structure body 111, an inner space 112 inside the cable guiding structure body 111, and a first fixing auxiliary 113 filled in the inner space 112, the first fixing auxiliary 113 is a foamed filler, and the optical cable 3 is fixed in the inner space 112 through the first fixing auxiliary 113;
or the cable guiding structure 11 is a solid pipe, the cable guiding structure 11 includes a cable guiding structure body 111, a thin cable guiding position 114 arranged on the surface of the cable guiding structure body 111, and a second fixing auxiliary 115 fixed on the thin cable guiding position 114, the thin cable guiding position 114 is the surface of the cable guiding structure body 111 or a micro-groove arranged on the surface of the cable guiding structure body 111, the second fixing auxiliary 115 is a ribbon, and the optical cable 3 is fixed on the thin cable guiding position 114 through the second fixing auxiliary 115;
the cable leading structure 11 is a foldable structure, and the liquid level sensor 2 and the sensor mounting structure 12 are fixed by any of the following methods: screwing, welding, gluing and clamping;
the storage box and the positioning connecting structure 13 are fixed in a magnetic attraction or connection or buckling mode;
the positioning connecting structure 13 is a magnet or iron;
the liquid level sensor 2 is an optical fiber type liquid level sensor, and the liquid level sensor 2 comprises an optical fiber liquid level sensing element 21 and a protection component 22 arranged outside the optical fiber liquid level sensing element 21;
the liquid sensitive mode of the optical fiber liquid level sensitive element 21 is refractive index sensitive, and the sensing structure is a fluorescent optical fiber; the sensing structure of the optical fiber liquid level sensing element 21 is any one of the following structures: the device comprises an inclined grating, an optical fiber Fabry-Perot interference cavity, a fluorescent optical fiber and an optical fiber head structure;
the liquid sensitive part of the optical fiber liquid level sensing element 21 extends out of the cable guiding structure 11 and is fixed outside the cable guiding structure 11;
as shown in fig. 4, the optical fiber signal demodulating unit 4 includes an optical fiber plug 41, an optical switch 42, a light source 43, a photodetector 44, a signal collecting and processing circuit 45, and a data transmitting circuit 46, which are electrically connected in sequence with the optical switch 42, wherein the optical fiber plug 41 is electrically connected with the end of the optical cable 3;
the optical fiber plug 41 is a 128-core single plug, the end face of the ferrule is an oblique 8-degree APC, the optical switch 42 is a 2-128-minute MEMS optical switch, the light source 43 is a C + L-band broadband laser light source, the photodetector 44 is a photodiode, and the signal acquisition and processing circuit 45 is used for switching the channel of the optical switch 42.
Example 2
As shown in fig. 1, a system for testing total liquid amount in an optical fiber point cloud storage tank, as shown in fig. 1, includes: support 1, level sensor 2, optical cable 3 and fiber signal demodulation unit 4.
The liquid level sensors 2 comprise a plurality of optical fiber point type liquid level sensors 2 which are coded with unique codes;
the cable separation device comprises a support 11, a plurality of sensor mounting structures 12, a positioning connecting structure 13 and a cable separation structure 14, wherein the sensor mounting structures 12 and the positioning connecting structure 13 are relatively fixed in spatial position and have definite three-dimensional relative spatial coordinate values;
the optical fiber signal demodulation unit 4 has a function of judging whether each optical fiber liquid level sensor is immersed by liquid or not, and can output a judgment signal;
specifically, referring to fig. 2 and 3, the optical fiber liquid level sensing unit will be described in detail. The optical fiber point type liquid level sensor 2 in the optical fiber liquid level sensing unit comprises an optical fiber liquid level sensing element 21 and a protection component 22. The liquid sensitive mode of the optical fiber liquid level sensitive element 21 is refractive index sensitive, and the sensing structure is a fluorescent optical fiber, and further, the liquid level sensitive element can also be an inclined grating, an optical fiber Fabry-Perot interference cavity or an optical fiber head structure. The protection component 22 mainly plays a role in protecting the optical fiber liquid level sensing element 21;
the light transmission optical cable 3 in the optical fiber liquid level sensing unit comprises two sections of a thin optical cable 31 and a thick optical cable 32. The thin optical cable 31 is directly connected with the optical fiber liquid level sensing element 21, so that the flexibility is good and the bending is convenient; while the thick cable 32 has armor protection for protecting the inner optical fibers from tensile or lateral pressure.
Fig. 5 shows a schematic view of the installation of the optical fiber liquid level sensing unit in an embodiment of a rigid hollow tube type support 1. The cable guide structure 11 in the stent 1 is a rigid hollow tube structure, and specifically includes a cable guide structure body 111, a tube inner space 112, and a first fixing auxiliary 113, where the first fixing auxiliary 113 is a foam filler. The optical fiber point type liquid level sensor 2 and the thin optical cable 31 enter the support 1 through the thin cable lead wire position 114, the sensor mounting structure 12 is a hole structure penetrating through the inside and the outside of the hollow tube structure, and the liquid sensitive part of the optical fiber point type liquid level sensor 2 extends out of the lead cable structure 11 and is fixed.
Referring to fig. 1, the bracket 1 is a foldable structure, is in a slender rod shape when being folded, is convenient for entering and exiting a small storage tank opening, and is unfolded in a storage tank to be measured during liquid level measurement. The diameter of the thin optical cable 31 in the optical fiber liquid level sensing unit is mm, the thin optical cable is flexible, the thin optical cable can be synchronously folded and unfolded along with the support 1, and the optical power loss of the thin optical cable does not exceed dB.
Referring to fig. 3, the cable structure 14 in the bracket 1 is composed of a thick cable fixing part 142 and a thin cable branching position 141. The light transmitting cable 3 is divided into two forms. The outer side of the bracket 1 is provided with a single multi-core thick optical cable 32 which is fixed by a thick cable fixing part 142, and the joint has the performances of tensile strength, sealing and the like; the inner side of the bracket 1 is provided with a plurality of single-core thin optical cables 31, and the trend division is realized through thin cable branching positions 141.
Referring to fig. 1, the connection mode between the positioning connection structure 13 in the bracket 1 and the storage tank to be tested is magnetic attraction, that is, the material of the positioning connection structure 13 is magnet or iron, and iron or magnet is installed at the positioning position corresponding to the storage tank to be tested. Furthermore, the connection mode of the positioning connection structure 13 and the storage tank to be tested can be a buckle or an adhesive; the fixing mode is three-point fixing.
Referring to fig. 4, the optical fiber signal demodulation unit 4 includes a light source 43, an optical fiber plug 41, an optical switch 42, a photodetector 44, a signal acquisition and processing circuit 45, and a data transmission circuit 46. Wherein, the light source 43 is a C + L waveband broadband laser light source 43; the single plug with the optical fiber plug 41 as the core and the end face of the inserted core adopt an oblique-degree APC process; the optical switch 42 is a divided MEMS optical switch 42; the photodetector 44 is a photodiode; the signal acquisition and processing circuit 45 has a channel switching control function of the optical switch 42, converts a photocurrent response signal generated by the photoelectric detector 44 into a voltage, acquires the voltage and processes the voltage into a digital signal sequence; the data is finally transmitted by the data transmission circuit 46.
Example 3
As shown in fig. 1, a system for testing total liquid amount in an optical fiber point cloud storage tank, as shown in fig. 1, comprises: support 1, level sensor 2, optical cable 3 and fiber signal demodulation unit 4.
The liquid level sensors 2 comprise a plurality of optical fiber point type liquid level sensors 2 which are coded with unique codes;
the device comprises a support 11, a plurality of sensor mounting structures 12, a positioning connecting structure 13 and a cable distributing structure 14, wherein the sensor mounting structures 12 are coded with unique codes, the sensor mounting structures 12 and the positioning connecting structure 13 are relatively fixed in spatial position and have definite three-dimensional relative spatial coordinate values;
the optical fiber signal demodulation unit 4 has a function of judging whether each optical fiber liquid level sensor is immersed by liquid or not, and can output a judgment signal;
specifically, referring to fig. 2 and 3, the optical fiber liquid level sensing unit will be described in detail. The optical fiber point type liquid level sensor 2 in the optical fiber liquid level sensing unit comprises an optical fiber liquid level sensing element 21 and a protection component 22. The liquid sensitive mode of the optical fiber liquid level sensitive element 21 is refractive index sensitive, and the sensing structure is a fluorescent optical fiber, and further, the liquid level sensitive element can also be an inclined grating, an optical fiber Fabry-Perot interference cavity or an optical fiber head structure. The protection component 22 mainly plays a role in protecting the optical fiber liquid level sensing element 21;
the light transmission cable 3 in the optical fiber liquid level sensing unit comprises two sections of a thin cable 31 and a thick cable 32. The thin optical cable 31 is directly connected with the optical fiber liquid level sensing element 21, so that the flexibility is good and the bending is convenient; while the thick cable 32 has armor protection for protecting the inner optical fibers from tensile or lateral pressure.
The installation of the optical fibre level sensing unit in an embodiment of a rigid solid bar type support 1 is schematically shown in fig. 6. The cable guide structure 11 in the bracket 1 adopts a rigid solid rod structure, and specifically comprises a cable guide structure body 111, a thin cable guide line position 114 and a second fixing auxiliary 115, wherein the thin cable guide line position 114 is a rod surface or a surface microgroove, and the fixing auxiliary is a ribbon. The connection mode between the optical fiber point type liquid level sensor 2 and the sensor mounting structure 12 can be screw joint, welding, cementing or clamping, and the thin optical cable 31 in the light transmission optical cable 3 is bound and fixed along the surface of the rod through a fixing accessory.
Referring to fig. 1, the bracket 1 is a foldable structure, is in a slender rod shape when being folded, is convenient for entering and exiting a small storage tank opening, and is unfolded in a storage tank to be measured during liquid level measurement. The diameter of the thin optical cable 31 in the optical fiber liquid level sensing unit is mm, the thin optical cable is flexible, the thin optical cable can be synchronously folded and unfolded along with the support 1, and the optical power loss of the thin optical cable does not exceed dB.
Referring to fig. 3, the cable structure 14 in the bracket 1 is composed of a thick cable fixing part 142 and a thin cable branching position 141. The light transmitting cable 3 is divided into two forms. The outer side of the bracket 1 is provided with a single multi-core thick optical cable 32 which is fixed by a thick cable fixing part 142, and the joint has the performances of tensile strength, sealing and the like; the inner side of the bracket 1 is provided with a plurality of single-core thin optical cables 31, and the trend division is realized through thin cable branching positions 141.
Referring to fig. 1, the connection mode between the positioning connection structure 13 in the bracket 1 and the storage tank to be tested is magnetic attraction, that is, the material of the positioning connection structure 13 is magnet or iron, and iron or magnet is installed at the positioning position corresponding to the storage tank to be tested. Furthermore, the connection mode of the positioning connection structure 13 and the storage tank to be tested can be a buckle or an adhesive; the fixing mode is three-point fixing.
Referring to fig. 4, the optical fiber signal demodulation unit 4 includes a light source 43, an optical fiber plug 41, an optical switch 42, a photodetector 44, a signal acquisition and processing circuit 45, and a data transmission circuit 46. Wherein, the light source 43 is a C + L wave band broadband laser light source 43; the single plug with the optical fiber plug 41 as the core and the end face of the ferrule adopt an oblique-degree APC process; the optical switch 42 is a divided MEMS optical switch 42; the photodetector 44 is a photodiode; the signal acquisition and processing circuit 45 has a channel switching control function of the optical switch 42, converts a photocurrent response signal generated by the photoelectric detector 44 into a voltage, acquires the voltage and processes the voltage into a digital signal sequence; the data is finally transmitted by the data transmission circuit 46.
The method of use of examples 1-3 is as follows:
the connection mode of the optical fiber point cloud storage tank liquid total amount testing system is as follows: connecting the bracket 1 with a storage tank to be tested through a positioning connecting structure 13, so that the bracket and the storage tank are rigidly connected and the spatial positions of the bracket and the storage tank are relatively fixed; the optical fiber point type liquid level sensors 2 are rigidly mounted on the corresponding sensor mounting structures 12 according to the codes, so that each optical fiber point type liquid level sensor 2 has a definite spatial position relative to the storage tank to be measured; the light transmitting optical cable 3 is led out of the bracket 1 through the cable leading structure 11 and the cable dividing structure 14 and is connected with the optical fiber signal demodulating unit 4; the optical fiber signal demodulation unit 4 is connected with the liquid total amount calculation unit through a signal transmission line.
The working mode of the optical fiber point cloud storage tank liquid total amount testing system is as follows: when liquid exists in the storage tank to be detected, the optical fiber signal demodulation unit 4 obtains judgment signals of whether all the code optical fiber point type liquid level sensors 2 are immersed by the liquid, the liquid total amount calculation unit extracts codes of all the immersed signals by the liquid, three-dimensional space distribution point clouds of the immersion signals are drawn by combining three-dimensional relative space coordinate values of the sensor mounting structure 12, the storage tank liquid shape envelope is obtained through extending topological operation, and then the liquid total amount is calculated.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the utility model concepts of the present invention in the scope of the present invention.
Claims (10)
1. The utility model provides an optic fibre point cloud storage tank liquid total amount testing arrangement which characterized in that: the device comprises a bracket (1) arranged on the inner wall of a storage tank, a plurality of liquid level sensors (2) which are arranged on the bracket (1) and are coded with unique codes, and an optical cable (3) connected with the liquid level sensors (2);
the support (1) comprises a cable guiding structure (11), and a plurality of sensor mounting structures (12) which are arranged on the cable guiding structure (11) and are coded with unique codes, a positioning connection structure (13) and a cable distributing structure (14);
the cable guide structure (11) is a tubular structure, and the sensor mounting structure (12) is a hole which is arranged on the cable guide structure (11) in a penetrating manner;
the cable leading structure (11) is divided into a plurality of rows and arranged on the side surface and the top surface of the storage tank and converged to the cable dividing structure (14), the cable dividing structure (14) is arranged in the center of the top surface of the storage tank, and the positioning and connecting structure (13) is fixed on the top in the storage tank;
the starting end of the optical cable (3) is connected with the liquid level sensor (2), and the optical cable (3) is fixed in the middle or outside of the cable leading structure (11) and converged to the cable dividing structure (14).
2. The device for testing the total amount of liquid in the optical fiber point cloud storage tank according to claim 1, wherein: the cable guiding structure (11) is a hollow tube, the cable guiding structure (11) comprises a cable guiding structure body (111), a tube inner space (112) inside the cable guiding structure body (111) and a first fixing auxiliary (113) filled in the tube inner space (112), the first fixing auxiliary (113) is a foaming filler, and the optical cable (3) is fixed in the tube inner space (112) through the first fixing auxiliary (113).
3. The optical fiber point cloud storage tank liquid total amount testing device according to claim 1, characterized in that: lead cable structure (11) is the solid pipe, lead cable structure (11) including lead cable structure body (111), set up and be in thin cable lead position (114) on lead cable structure body (111) surface with fix fixed auxiliary (115) of second of thin cable lead position (114), thin cable lead position (114) are the surface of lead cable structure body (111) or set up the microgroove on lead cable structure body (111) surface, the fixed auxiliary of second (115) are the ribbon, optical cable (3) are passed through fixed auxiliary of second (115) are fixed thin cable lead position (114).
4. The device for testing the total amount of liquid in the optical fiber point cloud storage tank according to claim 1, wherein: the cable guide structure (11) is a foldable structure, and the liquid level sensor (2) and the sensor mounting structure (12) are fixed by any of the following modes: screwing, welding, gluing and clamping.
5. The device for testing the total amount of liquid in the optical fiber point cloud storage tank according to claim 1, wherein: the storage box and the positioning connecting structure (13) are fixed in a magnetic attraction or connection or buckling mode;
the positioning connecting structure (13) is a magnet or iron.
6. The device for testing the total amount of liquid in the optical fiber point cloud storage tank according to claim 1, wherein: the liquid level sensor (2) is an optical fiber type liquid level sensor, and the liquid level sensor (2) comprises an optical fiber liquid level sensing element (21) and a protection component (22) arranged outside the optical fiber liquid level sensing element (21);
the optical cable (3) comprises a thin optical cable (31) connected with the optical fiber liquid level sensing element (21) and a thick optical cable (32) connected with the tail end of the thin optical cable (31);
the cable splitting structure (14) comprises a thin cable splitting position (141) and a thick cable fixing part (142) arranged at the upper end of the thin cable splitting position (141), the thin cable splitting position (141) is fixed at the tail end of the thin optical cable (31) and the outer part of the starting end of the thick optical cable (32), and the thick cable fixing part (142) is fixed in the thick optical cable (32).
7. The device for testing the total amount of liquid in the optical fiber point cloud storage tank according to claim 6, wherein: the liquid sensitive mode of the optical fiber liquid level sensitive element (21) is refractive index sensitive, and the sensing structure is a fluorescent optical fiber; the sensing structure of the optical fiber liquid level sensing element (21) is any one of the following structures: the device comprises an inclined grating, a fiber Fabry-Perot interference cavity, a fluorescent fiber and a fiber head structure.
8. The device for testing the total amount of liquid in the optical fiber point cloud storage tank according to claim 7, wherein: the liquid sensitive part of the optical fiber liquid level sensing element (21) extends out of the cable guide structure (11) and is fixed outside the cable guide structure (11).
9. The device for testing the total amount of liquid in the optical fiber point cloud storage tank according to claim 1, wherein: the optical fiber signal demodulation device comprises an optical fiber signal demodulation unit (4) connected with the tail end of an optical cable (3), wherein the optical fiber signal demodulation unit (4) comprises an optical fiber plug (41), an optical switch (42), a light source (43) and a photoelectric detector (44), a signal acquisition and processing circuit (45) and a data transmission circuit (46), wherein the optical fiber plug (41) is electrically connected with the tail end of the optical cable (3).
10. The device for testing the total amount of liquid in the optical fiber point cloud storage tank according to claim 9, wherein: the optical fiber plug (41) is a 128-core single plug, the end face of the plug core is an oblique 8-degree APC (automatic Power control), the optical switch (42) is a 2-to-128 MEMS (micro electro mechanical system) optical switch, the light source (43) is a C + L waveband broadband laser light source, the photoelectric detector (44) is a photodiode, and the signal acquisition and processing circuit (45) is used for switching the channel of the optical switch (42).
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| CN202122895372.3U CN216925724U (en) | 2021-11-23 | 2021-11-23 | Optical fiber point cloud storage tank liquid total amount testing device |
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| CN202122895372.3U CN216925724U (en) | 2021-11-23 | 2021-11-23 | Optical fiber point cloud storage tank liquid total amount testing device |
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