CN113804650A - Monitoring device and monitoring method - Google Patents
Monitoring device and monitoring method Download PDFInfo
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- CN113804650A CN113804650A CN202111097221.1A CN202111097221A CN113804650A CN 113804650 A CN113804650 A CN 113804650A CN 202111097221 A CN202111097221 A CN 202111097221A CN 113804650 A CN113804650 A CN 113804650A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 115
- 238000012806 monitoring device Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000003287 optical effect Effects 0.000 claims abstract description 102
- 239000013307 optical fiber Substances 0.000 claims abstract description 45
- 238000001514 detection method Methods 0.000 claims abstract description 24
- 230000005540 biological transmission Effects 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000000862 absorption spectrum Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 117
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 231100000331 toxic Toxicity 0.000 description 4
- 230000002588 toxic effect Effects 0.000 description 4
- 239000002341 toxic gas Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000001902 propagating effect Effects 0.000 description 2
- 238000004148 unit process Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/38—Investigating fluid-tightness of structures by using light
Abstract
The application provides a monitoring device and a monitoring method, comprising the following steps: the optical fiber laser comprises a laser transceiver, optical fibers and N optical path pools; the optical fiber is used for connecting the first end of the N optical path pools in series with the transmitting end of the laser transceiver, the second end of the N optical path pools is connected with the receiving end of the laser transceiver, and the N optical path pools are correspondingly arranged on N monitoring points of the monitoring pipeline or other positions needing monitoring. The laser transceiver is used for transmitting a first laser signal which can be absorbed by monitored gas, the optical path pool is used for capturing the monitored gas leaked from a monitoring point, and the laser transceiver is also used for receiving a second laser signal returned after passing through the optical fiber and the N optical path pools and judging whether gas leakage exists or not according to the first laser signal and the second laser signal. The detection of harmful gas around a plurality of monitoring points is realized through a set of check out test set in this application, can know the regional whole gas leakage situation on a large scale fast, has improved harmful gas leakage monitoring efficiency.
Description
Technical Field
The application relates to the field of gas concentration monitoring, in particular to monitoring equipment and a monitoring method.
Background
Toxic and harmful gas leaks and exists in the production life, and the high concentration gas who reveals and the compound that produces after carrying out the chemical reaction all probably cause people to be poisoned, even take place explosion phenomenon, produce the harm to the human body, and the gas of revealing in the air also can bring very big harm to other living beings in the nature, destroys the ecological stability in the gas area of revealing, consequently, to the monitoring of revealing of toxic and harmful gas can greatly prevent the harm of toxic gas to living beings and environment.
In daily life, with the popularization of gas equipment in life, safety accidents related to gas still frequently occur, and therefore, the construction of a monitoring system of a gas pipeline network is urgent. The safety accidents related to the gas are accompanied by the occurrence of gas leakage events, and the key of the monitoring system is to timely and accurately find the leakage events and quickly dispose the leakage events. Currently, a common monitoring technology is point monitoring, that is, monitoring equipment is installed in each toxic gas leakage area. When the point type monitoring is applied to the region on a large scale, multiple points are required to be arranged in the region on a large scale for monitoring, each monitoring device is checked regularly, the whole gas leakage condition in the region on a large scale cannot be known quickly, and the monitoring efficiency is low.
Disclosure of Invention
The application provides a monitoring device and a monitoring method, which are used for solving the problem of low efficiency of multipoint monitoring in a large-range area.
In one aspect, the present application provides a monitoring device comprising: the optical fiber laser comprises a laser transceiver, optical fibers and N optical path pools; wherein N is a positive integer;
the optical fiber is used for connecting the N optical path pools in series and then connecting the first ends of the optical path pools with the transmitting end of the laser transceiver, and the second ends of the optical fiber are connected with the receiving end of the laser transceiver; the N optical path pools are correspondingly arranged on N monitoring points on the monitoring pipeline one by one;
the laser transceiver is used for transmitting a first laser signal absorbed by monitoring gas in a monitored pipeline, the optical path pool is used for capturing the monitoring gas leaked from a monitoring point, and the laser transceiver is also used for receiving a second laser signal returned after passing through the optical fiber and the N optical path pools and judging whether gas leakage exists or not according to the first laser signal and the second laser signal.
In the monitoring device, the optical path pools with the corresponding number are arranged on the N monitoring points and are sequentially connected through the optical fibers, so that optical signals are not easy to lose in the transmission process, and the accuracy of detection results is ensured. In addition, the laser transceiver only needs to detect the laser signal returned by the optical fiber and the N optical path pools, whether harmful gas leakage occurs in the region containing the N monitoring points can be known, independent monitoring on each monitoring point is not needed, and the harmful gas leakage monitoring efficiency is improved.
Optionally, the optical path pool is provided with a cavity; the optical path pool is also provided with an optical input end, an optical output end and a gas end;
the cavity is communicated with the light input end and the light output end; the cavity is communicated with a monitoring point on the monitoring pipeline through a gas end, and a first laser signal is emitted into the cavity, absorbed by monitoring gas leaked from the monitoring point and then emitted to the optical fiber from the cavity; wherein, the transmission direction of the first laser signal in the cavity is one-way transmission.
Optionally, the monitoring device further comprises:
and the N first collimating units are connected with the input ends of the N optical path pools in a one-to-one correspondence manner and are used for adjusting the transmitting direction of the first laser signals transmitted into the corresponding optical path pools so as to transmit the first laser signals to the output ends of the optical path pools from the input ends of the optical path pools through the cavity.
Optionally, the monitoring device further comprises:
the N second collimation units are connected with the output ends of the N optical path pools in a one-to-one correspondence mode and used for adjusting the emission direction of the first laser signal;
and the N focusing units are connected with the N second collimating units in a one-to-one correspondence manner and used for focusing, adjusting and transmitting the first laser signals in the transmitting direction and then transmitting the first laser signals to the optical fiber.
Optionally, the monitoring gas is free to diffuse into the chamber through the gas end.
In the monitoring equipment, the first collimating unit and the second collimating unit are added in each optical path cell to determine the propagation path of light in the cavity, so that the light emitted into the cavity from the optical fiber can accurately reach the output end of the optical path cell, and the monitoring equipment can normally work. In addition, a focusing unit is further arranged in the optical path pool, so that light beams scattered by particles existing in gas are gathered again in the cavity propagation process, laser loss caused by light scattering is reduced, and the accuracy of monitoring results is improved.
Optionally, the laser transceiver is further configured to generate an alarm signal when it is determined that there is a gas leak and the leak concentration of the monitored gas is greater than a second preset concentration.
Optionally, the laser transceiver comprises:
the transmitting unit is provided with a transmitting end and a control end, wherein the transmitting end is used as the transmitting end of the laser transceiver and used for transmitting a first laser signal;
the receiving unit is provided with a receiving end and an output end, wherein the receiving end is used as the receiving end of the laser transceiver and is used for receiving the second laser signal and generating a second electric signal according to the second laser signal;
the control unit is connected with the control end of the transmitting unit, is also connected with the output end of the receiving unit, and is used for generating a first electric signal for controlling the transmitting unit to generate a first laser signal, acquiring a second electric signal sent by the receiving unit, judging whether gas leakage exists according to the first electric signal and the second electric signal, and generating an alarm signal when the gas leakage exists and the leakage concentration of the monitored gas is in a first preset range.
Optionally, the transmitting unit comprises: a tunable diode;
the control unit is used for generating and sending a tuning signal to the tunable diode so that the tunable diode generates a first laser signal within a second preset range; wherein the second predetermined range refers to a characteristic absorption spectrum range of the monitored gas.
Optionally, the control unit is further specifically configured to:
detecting the phase locking of the first electric signal and the second electric signal to obtain a detection result;
obtaining multiple harmonic signals according to the detection result; the multiple harmonic signals comprise first harmonic signals and second harmonic signals;
performing concentration inversion calculation on the first harmonic signal and the second harmonic signal to obtain the leakage concentration of the gas;
when the leakage concentration is greater than a first preset concentration, generating an alarm signal;
and determining that gas leakage exists when the leakage concentration is less than or equal to a first preset concentration and greater than a second preset concentration.
In the technical scheme, the control unit processes and calculates the laser signal transmitted by the transmitting unit and the signal received by the receiving unit to obtain the leakage concentration of the harmful gas, so that the harmful gas is effectively monitored.
In another aspect, the present application provides a monitoring method, including:
receiving a second laser signal returned after passing through the optical fiber and the N optical path pools; the monitoring gas leakage monitoring system comprises a monitoring point, a laser transceiver, an optical path cell, a gas leakage monitoring unit and a gas leakage monitoring unit, wherein a first laser signal absorbed by monitoring gas in the monitoring pipe is generated and transmitted by the laser transceiver;
and judging whether gas leakage exists according to the first laser signal and the second laser signal.
And generating an alarm signal when the gas leakage is judged to exist and the leakage concentration of the monitored gas is greater than a first preset concentration.
The monitoring device and the monitoring method provided by the application comprise: the optical fiber laser comprises a laser transceiver, optical fibers and N optical path pools; the optical fiber is used for connecting the first end of the N optical path pools in series with the transmitting end of the laser transceiver, the second end of the N optical path pools is connected with the receiving end of the laser transceiver, and the N optical path pools are correspondingly arranged on N monitoring points of the monitoring pipeline or other positions needing monitoring. The laser transceiver is used for transmitting a first laser signal which can be absorbed by monitored gas, the optical path pool is used for capturing the monitored gas leaked from a monitoring point, and the laser transceiver is also used for receiving a second laser signal returned after passing through the optical fiber and the N optical path pools and judging whether gas leakage exists or not according to the first laser signal and the second laser signal. The detection of harmful gas around a plurality of monitoring points is realized through a set of check out test set in this application, can know the regional whole gas leakage situation on a large scale fast, has improved harmful gas leakage monitoring efficiency.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic view of an application scenario of a monitoring device according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an optical path cell according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a monitoring device according to an embodiment of the present application;
fig. 4 is a flowchart of a monitoring method according to an embodiment of the present application;
fig. 5 is a flowchart of a monitoring method according to an embodiment of the present application.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Reference numerals:
10: an optical fiber;
20: a connection unit;
30: an optical path pool; 301: a first collimating unit; 302: a second collimating unit; 303: a focusing unit; 304: a cavity; 306: a gas end; 307: a light input end; 308: a light output end;
40: monitoring the pipeline;
501: a first laser signal; 502: a second laser signal;
60: monitoring the gas;
70: a laser transceiver; 701: a transmitting unit; 702: a receiving unit; 703: a control unit; 704: and an alarm unit.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
Toxic and harmful gas leaks and exists in the production life, and the high concentration gas who reveals and the compound that produces after carrying out the chemical reaction all probably cause people to be poisoned, even take place explosion phenomenon, produce the harm to the human body, and the gas of revealing in the air also can bring very big harm to other living beings in the nature, destroys the ecological stability in the gas area of revealing, consequently, to the monitoring of revealing of toxic and harmful gas can greatly prevent the harm of toxic gas to living beings and environment.
In daily life, with the popularization of gas equipment in life, safety accidents related to gas still frequently occur, and therefore, the construction of a detection system of a gas pipeline network is urgent. The safety accidents related to the gas are accompanied by the occurrence of gas leakage events, and the key of the monitoring system is to timely and accurately find the leakage events and quickly dispose the leakage events. Currently, a common monitoring technology is point monitoring, that is, monitoring equipment is installed in each toxic gas leakage area. When the point type monitoring is applied to the region on a large scale, multiple points are required to be arranged in the region on a large scale for monitoring, each monitoring device is checked regularly, the whole gas leakage condition in the region on a large scale cannot be known quickly, and the monitoring efficiency is low.
In view of the above technical problems, embodiments of the present application provide a monitoring device and a monitoring method, which aim to solve the problem of low monitoring efficiency of the monitoring device in a large-scale area where gas leaks. The technical idea of the application is as follows: the corresponding number of optical path pools are arranged in one or more areas to be monitored, laser signals passing through the air in the area/areas to be detected are obtained through the optical fibers and the optical path pools which are connected in series, and the emitted laser signals and the received laser signals are compared and calculated to judge whether gas leakage exists or not.
Fig. 1 is a schematic view of an application scenario of a monitoring device according to an embodiment of the present disclosure, as shown in fig. 1, a monitoring pipe 40 is connected by a connection unit 20, and a monitoring gas 60 is transmitted in the connected pipe. The monitoring device is arranged outside the monitoring pipeline and comprises an optical fiber 10, an optical path cell 30 and a laser transceiver 70. The number of the optical path cells 30 is N, the number is set according to the number of the monitoring points, the optical fiber 10 is used for connecting the N optical path cells in series and then connecting the first end of the optical path cell with the transmitting end of the laser transceiver 70, and the optical fiber is also used for connecting the second end of the optical path cell with the receiving end of the laser transceiver; the N optical path pools are correspondingly arranged on N monitoring points of the monitoring pipeline one by one. In the application scenario shown in fig. 1, there are two connection units 20 on the pipeline, and the connection units are locations where gas leakage is likely to occur, so the area around the connection units is a monitoring point, and 2 optical path cells are installed near the connection units 20 to capture the gas in the corresponding area. The laser transceiver 70 is used for transmitting a first laser signal which can be absorbed by the monitoring gas 60 in the monitoring pipeline 40, the optical path cell 30 is used for storing the monitoring gas 60 leaked from a monitoring point, and the laser transceiver 70 is also used for receiving a second laser signal returned after passing through the optical fiber 10 and the N optical path cells 30. Wherein the wavelength of the first laser signal is consistent with the specific absorption wavelength of the monitoring gas. For example: methane is a main component of natural gas, and the absorption peak wavelength of methane in the near infrared band is 1653.72nm, so the wavelength of the first laser signal transmitted by the laser transceiver is 1653.72nm, and the first laser signal is used as a specific laser signal for monitoring natural gas leakage.
When gas leakage exists, the first laser signal is absorbed by the leaked gas, and the wave peak of the second laser signal is smaller than that of the first laser signal. And judging whether gas leakage exists according to the first laser signal and the second laser signal. When a gas leak occurs, the laser transceiver 70 generates alarm data and transmits the alarm data to the alarm unit 704 to alarm. The alarm unit may be provided in the laser transceiver 70 in one embodiment, and in the client in another embodiment.
In the above embodiment, the optical path cells with the corresponding number are set for the N monitoring points, and are connected in sequence through the optical fiber, so that the optical signal is not easily lost in the transmission process, and the accuracy of the detection result is ensured. In addition, the laser transceiver only needs to detect the laser signal returned by the optical fiber and the N optical path pools, whether harmful gas leakage occurs in the region containing the N monitoring points can be known, independent monitoring on each monitoring point is not needed, and the harmful gas leakage monitoring efficiency is improved.
Fig. 2 is a schematic structural diagram of an optical path cell according to an embodiment of the present application. As shown in fig. 2, the optical path cell 30 has a cavity 304, a light input end 307, a light output end 308, and a gas end 306, wherein each cavity 304 has a first collimating unit 301, a second collimating unit 302, and a focusing unit 303. In the monitoring device, the number of the first collimating units 301, the second collimating units 302, and the focusing units 303 is the same as the number of the optical path cells 30, and is N. In the application scenario diagram shown in fig. 1, two optical path cells are provided in the detection apparatus, and then 2 first collimating units, 2 second collimating units, and 2 focusing units exist in the detection apparatus.
In an optical path cell, the cavity 304 is connected to the light input end 307 and the light output end 308, the second end of the optical fiber 10 is connected to the light input end 307 of the optical path cell, and the first end of the optical fiber 10 is connected to the light output end 308 of the optical path cell. The first collimating unit 301 is connected to the optical input end 307 of the optical path cell 30, the second collimating unit 302 is connected to the focusing unit 303, and the focusing unit 303 is connected to the optical output end 308 of the optical path cell 30.
When the laser signal passes through the optical path cell in the propagation process, after the first laser signal 501 is emitted into the cavity 304 from the optical fiber 10 through the optical input end 307, the first collimating unit 301 receives the incident first laser signal 501, and adjusts the emitting direction of the absorbed laser signal, so that the first laser signal can be sent from the optical input end 307 of the optical path cell to the optical output end 308 of the optical path cell through the cavity. The output end of the optical path pool is provided with a second collimating unit 302 and a focusing unit 303, wherein the second collimating unit 302 receives a first laser signal 501 reaching the output end of the optical path pool and is used for adjusting the transmitting direction of the first laser signal 501 so that the propagation direction of the first laser signal is aimed at the output end of the optical path pool, the focusing unit 303 receives the first laser signal whose direction is adjusted by the second collimating unit 302, focuses the first laser signal which generates scattering, and makes the first laser signal enter the optical fiber 10 through the optical output end 308 of the optical path pool, and marks the laser signal which is transmitted into the optical fiber 10 again as a second laser signal 502, and the laser signal is transmitted into the next optical path pool or reaches the laser transceiver. Wherein the scattering of the first laser signal is due to particles present in the cavity gas during transmission.
More specifically, the first laser signal may be absorbed by a monitoring gas leaked from a monitoring point obtained by the cavity while propagating in the cavity. The relationship between the wavelength of the first laser signal and the specific absorption wavelength of the monitored gas has been explained in the embodiment shown in fig. 1, and is not described herein again.
More specifically, the transmission direction of the laser signal in the detection device is unidirectional. The propagation direction is from the laser output end of the laser transceiver to the laser receiving end.
More specifically, the monitoring gas 60 enters the chamber 304 through a gas port 306 on the optical path cell 30. The mode of monitoring the gas entering the chamber is free diffusion. Wherein, free diffusion means that the gas end 306 is not connected with any auxiliary device, and the gas outside the cavity freely moves into the cavity through gas molecules.
In the above embodiment, when the laser signal propagates in the optical path pool in the monitoring device, the propagation path of the laser signal in the cavity is determined by the first collimating unit, the second collimating unit and the focusing unit, so as to ensure the continuity of the laser signal propagating in the monitoring device and the accuracy of the monitoring result.
Fig. 3 is a schematic structural diagram of a monitoring device according to an embodiment of the present application. As shown in fig. 3, the monitoring device includes a laser transceiver 70, an optical fiber 10, and an optical path cell 30. The laser transceiver 70 includes a transmitting unit 701, a receiving unit 702, and a control unit 703. The optical path cell includes a first collimating unit 301, a second collimating unit 302, a focusing unit 303, and a cavity 304.
In the laser transceiver 70, a transmission terminal and a control terminal are provided in the transmission unit 701. The transmitting terminal is used as a transmitting terminal of the laser transceiver and used for transmitting the first laser signal. The control end is configured to receive a control signal sent by the control unit 703, and is configured to generate a first laser signal through modulation at the transmitting end, where the control signal includes a sawtooth wave wavelength adjustment signal and a sine tuning signal. And the transmitting end generates a laser signal with a specific absorption wavelength corresponding to the leaked gas by utilizing sawtooth wave tuning.
More specifically, the transmitting end comprises a tunable diode. In another embodiment, the control unit 703 generates and sends a sawtooth tuning signal to the tunable diode, so that the tunable diode generates the first laser signal within the second preset range. Wherein the second predetermined range refers to a characteristic absorption spectrum range of the monitored gas.
The receiving unit 702 is provided with a receiving end and an output end. The receiving end is used as the receiving end of the laser transceiver and is used for receiving the second laser signal and generating a second electric signal according to the second laser signal.
More specifically, the receiving end includes a photodetector for converting the received laser signal into an electrical signal having a certain wavelength. The output end sends the electrical signal converted by the receiving end to the control unit 703, so as to realize the change detection of the electrical signal by the control unit.
The control unit 703 is connected to the control end of the transmitting unit 701, is also connected to the output end of the receiving unit 702, and is configured to generate a first electrical signal for controlling the transmitting unit 701 to generate the first laser signal, acquire a second electrical signal sent by the receiving unit, determine whether gas leakage exists according to the first electrical signal and the second electrical signal, and generate an alarm signal when it is determined that gas leakage exists and the leakage concentration of the monitored gas is within a first preset range.
More specifically, the determination of the gas leakage by the monitoring device is made by processing a detection result obtained by detecting the phase lock of the first electric signal and the second electric signal. The phase-locked detection means that the first electric signal and the second electric signal are subjected to phase-sensitive demodulation through a phase-locked amplifier to obtain a harmonic signal carrying gas concentration information. In the detection result, the harmonic signal carrying the gas concentration information contains multiple harmonic signals, wherein the multiple harmonic signals comprise a first harmonic signal and a second harmonic signal. Because the amplitude of the higher harmonic signal is low, the detection is not facilitated, and the first harmonic signal and the second harmonic signal are generally processed.
More specifically, the processing mode of the first harmonic and the second harmonic signals is concentration inversion calculation to obtain the leakage concentration of the monitored gas in the cavity, wherein the concentration inversion calculation is the prior art and is not repeated here. When the leakage concentration is greater than a first preset concentration, generating an alarm signal; and determining that gas leakage exists when the leakage concentration is less than or equal to a first preset concentration and greater than a second preset concentration. The first preset concentration refers to the concentration of leaked gas reaching the concentration harmful to human bodies and the environment, and the second preset concentration refers to the maximum value of the normal range of the concentration of the monitored gas at the monitoring point.
More specifically, generating the alert signal includes, but is not limited to, a beep alert, a signal light alert, sending a message alert to the client.
In the above embodiment, the control unit processes and calculates the laser signal transmitted by the transmitting unit and the laser signal received by the receiving unit to obtain the leakage concentration of the harmful gas in the environment where the laser signal passes through the optical path cell/cells, so as to effectively monitor the harmful gas and improve the obtaining efficiency of the multi-region leakage condition.
Fig. 4 is a flowchart of a monitoring method according to an embodiment of the present application. On the basis of fig. 1 to 3, as shown in fig. 4, with a laser transceiver as an execution subject, the method of the embodiment may include the following steps:
s401, the laser transceiver receives a second laser signal returned after passing through the optical fiber and the N optical path pools.
More specifically, the second laser signal is obtained by absorbing the leakage gas obtained from the optical path cell while the first laser signal is sequentially propagated in the optical fiber and the N optical path cells. The first laser signal capable of being absorbed in the pipeline to be monitored is generated and transmitted by the laser transceiver, and the optical path cell is used for absorbing part of the first laser signal when monitoring gas leaks from a monitoring point.
More specifically, the generation and transmission of the first laser signal by the laser transceiver means that the control unit in the laser transceiver transmits a sawtooth wave wavelength adjusting electrical signal and a sine tuning electrical signal to the transmission unit, and the transmission unit modulates and generates the first laser signal according to the acquired electrical signal and transmits the optical signal into an optical fiber connected with the laser transceiver.
S402, the laser transceiver judges whether gas leakage exists according to the first laser signal and the second laser signal.
More specifically, gas refers to a monitoring gas.
More specifically, the laser transceiver respectively acquires a corresponding first electrical signal and a corresponding second electrical signal according to the first laser signal and the second laser signal, and acquires the concentration of gas leakage by performing phase-locked detection and concentration inversion on the first electrical signal and the second electrical signal.
And S403, generating an alarm signal by the laser transceiver when the gas leakage is judged to exist and the leakage concentration of the monitored gas is greater than a first preset concentration.
More specifically, the first predetermined concentration refers to a concentration of the leaking gas reaching a concentration harmful to human body and environment.
In the above embodiment, the laser transceiver processes the first laser signal and the second laser signal to determine whether the gas leaks, sets the first preset concentration, and alarms when the gas leakage exceeds the preset concentration, thereby improving the efficiency of information feedback and the efficiency of gas leakage processing.
Fig. 5 is a flowchart of a monitoring method according to an embodiment of the present disclosure, in which a control unit is used as an execution main body of the detection method provided by the present disclosure, and a laser transceiver includes a transmitting unit, a receiving unit, and a control unit. On the basis of fig. 1 to 3, as shown in fig. 5, the method of the present embodiment may include the following steps:
s501, the control unit is used for generating a first electric signal for controlling the emission unit to generate the first laser signal.
More specifically, the first electrical signal includes: a sawtooth wave wavelength adjusting electrical signal and a sine tuning electrical signal.
More specifically, the process of the control unit generating the first electrical signal and controlling the emitting unit to generate the first laser signal has been explained in detail in step S401, and is not described herein again.
S502, the control unit receives a second electric signal generated by a second laser signal returned after passing through the optical fiber and the N optical path pools.
More specifically, the acquisition of the second laser signal has been explained in detail in step S401, and is not described here again.
More specifically, the second electrical signal is acquired by a photodetector. And the photoresistor is arranged in the photoelectric detector and changes the resistance value according to the received second laser signal, so that the electric signal in the photoelectric detector is influenced.
S503, the control unit performs phase locking detection according to the first electric signal and the second electric signal to obtain a detection result.
More specifically, the control unit includes a lock-in amplifier therein. The phase-locked detection means that the control unit carries out phase-sensitive demodulation on the first electric signal and the second electric signal in a phase-locked amplifier to obtain a harmonic signal carrying gas concentration information.
More specifically, the first electric signal is acquired from step S501, and the second electric signal is acquired from step S502.
And S504, the control unit obtains multiple harmonic signals according to the detection result.
More specifically, the multiple harmonic signals include first harmonic and second harmonic signals.
And S505, the control unit carries out concentration inversion calculation on the first harmonic signal and the second harmonic signal to obtain the leakage concentration of the gas.
More specifically, the concentration inversion calculation is a prior art, and is not described herein.
More specifically, after the gas concentration is obtained, the control unit compares the gas concentration with a first preset concentration and a second preset concentration, and generates an alarm signal when the leakage concentration is greater than the first preset concentration; and determining that gas leakage exists when the leakage concentration is less than or equal to a first preset concentration and greater than a second preset concentration.
In the above embodiment, the control unit performs phase-locked detection on the first electrical signal generating the first laser signal and the second electrical signal receiving the second laser signal to obtain the harmonic signal, performs concentration inversion on the harmonic signal to obtain the leakage concentration of the gas, and sets the first preset threshold and the second preset threshold to divide the severe situations of the gas leakage, which is helpful for making a treatment scheme according to the severe situations and improving the treatment efficiency of the gas leakage.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. A monitoring device, comprising: the optical fiber laser comprises a laser transceiver, optical fibers and N optical path pools; wherein N is a positive integer;
the optical fiber is used for connecting the N optical path pools in series and then connecting the first ends of the N optical path pools with the transmitting end of the laser transceiver, and the second ends of the optical fiber are connected with the receiving end of the laser transceiver; the N optical path pools are correspondingly arranged on N monitoring points on the monitoring pipeline one by one;
the laser transceiver is used for transmitting a first laser signal which can be absorbed by monitoring gas in the monitoring pipeline, the optical path pool is used for capturing the monitoring gas leaked from the monitoring point, the laser transceiver is also used for receiving a second laser signal returned after passing through the optical fiber and the N optical path pools, and whether gas leakage exists or not is judged according to the first laser signal and the second laser signal.
2. The monitoring device of claim 1, wherein the optical path cell is provided with a cavity; the optical path pool is also provided with an optical input end, an optical output end and a gas end;
wherein the cavity is communicated with the light input end and the light output end; the cavity is communicated with a monitoring point on the monitoring pipeline through the gas end, and the first laser signal is absorbed by monitoring gas leaked from the monitoring point after being emitted into the cavity and then emitted to the optical fiber from the cavity; wherein the transmission direction of the first laser signal in the cavity is unidirectional.
3. The monitoring device of claim 2, further comprising:
the first collimating units are connected with the input ends of the optical path pools in a one-to-one correspondence mode and used for adjusting the transmitting direction of the first laser signals transmitted into the corresponding optical path pools so that the first laser signals can be transmitted to the output ends of the optical path pools from the input ends of the optical path pools through the cavities.
4. The monitoring device of claim 3, further comprising:
the N second collimation units are connected with the output ends of the N optical path pools in a one-to-one correspondence manner and are used for adjusting the emission direction of the first laser signal;
and the N focusing units are connected with the N second collimating units in a one-to-one correspondence manner and are used for focusing the first laser signals in the transmitting direction and then transmitting the first laser signals to the optical fiber.
5. The monitoring device of claim 2, wherein the monitoring gas is free to diffuse into the cavity through a gas end.
6. The monitoring device of claim 1, wherein the laser transceiver is further configured to generate an alarm signal when it is determined that there is a gas leak and the leak concentration of the monitored gas is greater than a second predetermined concentration.
7. The monitoring device of claim 6, wherein the laser transceiver comprises:
the transmitting unit is provided with a transmitting end and a control end, wherein the transmitting end of the transmitting unit is used as the transmitting end of the laser transceiver and used for transmitting the first laser signal;
the receiving unit is provided with a receiving end and an output end, wherein the receiving end is used as the receiving end of the laser transceiver and is used for receiving the second laser signal and generating a second electric signal according to the second laser signal;
the control unit is connected with the control end of the transmitting unit and the output end of the receiving unit, and is used for generating a first electric signal for controlling the transmitting unit to generate a first laser signal and acquiring a second electric signal sent by the receiving unit, judging whether gas leakage exists according to the first electric signal and the second electric signal, and generating an alarm signal when the gas leakage is judged to exist and the leakage concentration of the monitored gas is in a first preset range.
8. The monitoring device of claim 7, wherein the transmitting unit comprises: a tunable diode;
the control unit is used for generating and sending a tuning signal to the tunable diode so that the tunable diode generates a first laser signal within a second preset range; wherein the second predetermined range refers to a characteristic absorption spectrum range of the monitored gas.
9. The monitoring device of claim 7, wherein the control unit is further specifically configured to:
detecting the phase locking of the first electric signal and the second electric signal to obtain a detection result;
obtaining multiple harmonic signals according to the detection result; wherein the multiple harmonic signals comprise first harmonic and second harmonic signals;
performing concentration inversion calculation on the first harmonic signal and the second harmonic signal to obtain the leakage concentration of the monitored gas in the cavity;
when the leakage concentration is greater than a first preset concentration, generating an alarm signal;
and determining that gas leakage exists when the leakage concentration is less than or equal to the first preset concentration and greater than a second preset concentration.
10. A monitoring method applied to a laser transceiver, the method comprising:
receiving a second laser signal returned after passing through the optical fiber and the N optical path pools; wherein, the first laser signal that can be absorbed by the monitoring gas in the monitoring pipeline is generated and emitted by the laser transceiver, and the optical path cell is used for absorbing part of the first laser signal when the monitoring gas leaks from the monitoring point;
and judging whether gas leakage exists according to the first laser signal and the second laser signal.
And generating an alarm signal when the gas leakage is judged to exist and the leakage concentration of the monitored gas is greater than a first preset concentration.
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