CN211576937U - Specific gas multi-position detection system - Google Patents
Specific gas multi-position detection system Download PDFInfo
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- CN211576937U CN211576937U CN201822184855.0U CN201822184855U CN211576937U CN 211576937 U CN211576937 U CN 211576937U CN 201822184855 U CN201822184855 U CN 201822184855U CN 211576937 U CN211576937 U CN 211576937U
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Abstract
The utility model provides a specific gas multi-position detection system, which comprises a laser light source, an optical fiber branching unit, at least two gas induction units, a photoelectric conversion detection unit and a signal acquisition processing unit; the gas sensing units are arranged at the positions to be detected, and the photoelectric conversion detection units are connected with the signal acquisition and processing units; the laser light source sends optical signals to generate at least two optical signals through the optical fiber branching unit, and the optical signals respectively pass through the gas sensing unit and then are transmitted to the photoelectric conversion detection unit; the photoelectric conversion detection unit converts the optical signal into an electric signal, the photoelectric conversion detection unit sends the processed electric signal to the signal acquisition and processing unit, and then the gas concentration of the position to be detected is measured. By applying the technical scheme, the cost of the gas detection system can be greatly reduced, the reliability of the system is improved, and the power consumption of the whole system is reduced.
Description
Technical Field
The utility model relates to a field of mine development specifically indicates a specific gaseous multiposition detecting system.
Background
The gas is a general name of underground toxic and harmful gas, the underground toxic and harmful gas mainly comprises methane, the methane (CH4) is flammable and explosive, and gas explosion is a natural disaster with the strongest destructiveness in the coal mine production process and seriously harms the safety of coal mine workers. Therefore, the development of a methane detection system for detecting the generation source, leakage source and methane concentration of methane gas in time has great significance for safe operation of coal enterprises, personnel safety of coal mine workers and environmental protection. The traditional thermocatalytic methane sensor has the following defects: (1) the working temperature of the sensor is high, the surface temperature of a general element is 200-300 ℃, the interior of the element can reach 700-800 ℃, and the sensor can not be made into an intrinsic safety type structure and can only be made into an explosion-proof type; (2) the working current is large, the current power consumption is large, and the bus connection is not easy to make; (3) the element is susceptible to poisoning effects of sulfide, halogen compounds and the like, and the service life is shortened; (4) the error of the detection indicated value is larger in an anoxic environment; (5) after long-time work, the sensor is affected by various conditions, the zero point or drift of the sensor generates, the sensitivity can generate attenuation, and in order to ensure accurate detection, the sensor needs to be calibrated regularly, and usually once calibration is carried out in seven days, so that the workload is increased greatly.
In recent years, the detection of gas concentration by using laser spectroscopy has become a popular research direction, and particularly, the appearance of a laser with continuous tunability, narrow line width, low power consumption and low price makes it possible to build a methane detector by using the laser spectroscopy. The development of the detector needs to develop a laser spectrum technology with high sensitivity and high resolution from the research of methane molecular spectrum. However, although the product technology for detecting the gas concentration by using the laser spectrum technology is mature in recent years, the price of the laser is reduced compared with that of the prior art, the price remains high on the whole, and at the present stage, the coal mine is going to the productive coal enterprises without being good at the whole, the operation pressure is high, and the cost problem troubles many enterprises.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome not enough among the above-mentioned prior art, provide a specific gaseous multiposition detecting system, realize reducing gaseous detecting system's cost by a wide margin, also improved the reliability of system and reduced entire system's power consumption simultaneously.
In order to solve the technical problem, the utility model provides a specific gas multiposition detection system, which comprises a laser light source, an optical fiber branching unit, at least two gas induction units, a photoelectric conversion detection unit and a signal acquisition processing unit; the gas sensing units are arranged at each position to be tested and comprise outlets and inlets; the laser light source is connected with the optical fiber branching unit through a transmission optical fiber, the optical fiber branching unit is connected with an inlet of the gas sensing unit through the transmission optical fiber, and an outlet of the gas sensing unit is connected with the gas conversion detection unit through the transmission optical fiber; the photoelectric conversion detection unit is connected with the signal acquisition processing unit; the laser light source sends optical signals to generate at least two optical signals through the optical fiber branching unit, and the optical signals respectively pass through the gas sensing unit and then are transmitted to the photoelectric conversion detection unit; the photoelectric conversion detection unit converts the optical signal into an electric signal, the photoelectric conversion detection unit sends the processed electric signal to the signal acquisition and processing unit, and then the gas concentration of the position to be detected is measured.
In a preferred embodiment, the gas sensing unit is a straight gas sensing cavity, the optical signal enters the straight gas sensing cavity from the inlet and is transmitted to the photoelectric conversion detection unit from the outlet, and the straight gas sensing cavity is used for reducing coupling exhaustion generated when the optical signal passes through the straight gas sensing cavity.
In a preferred embodiment, the photoelectric conversion detection unit comprises a light intensity detection module; and the light intensity detection module measures the gas concentration of each position to be detected according to the intensity change of the optical signal.
In a preferred embodiment, the photoelectric conversion detection unit comprises a wavelength scanning detection module; and the wavelength scanning detection module is used for measuring the gas concentration of each position to be measured according to the intensity change of the wavelength scanning optical signals of the optical signals.
In a preferred embodiment, the system further comprises a signal acquisition processing unit; and the signal acquisition and processing unit analyzes and processes the received electric signals to generate gas concentration information of each position to be detected.
In a preferred embodiment, the laser light source is a laser light source with a light source wavelength of 1653 nm.
In a preferred embodiment, the length of the straight gas sensing cavity ranges from 1cm to 99 cm.
Compared with the prior art, the technical scheme of the utility model possess following beneficial effect:
1. a laser light source generates multiple paths of optical signals through an optical fiber branching unit to detect gas at each position to be detected, and the function that one laser light source detects multiple positions to be detected simultaneously is achieved. The overall price of the laser is high, so that the cost of the whole gas detection system is high all the time. The gas at a plurality of positions can be detected only by one laser light source, compared with the prior art, the system cost is greatly reduced, and the reliability of the system is improved. Meanwhile, only one laser light source is used, so that the use of a power supply is reduced, the power consumption of the whole system is reduced, the system cost is reduced to a certain extent, and the laser light source has a good application prospect.
2. The straight gas sensing cavity is arranged to be straight, so that loss of optical signals caused by touching the inner wall of the gas sensing cavity can be effectively avoided, and coupling exhaustion generated when the optical signals pass through the straight gas sensing cavity is reduced.
Drawings
Fig. 1 is an overall block diagram of a specific gas multi-position detection system according to a preferred embodiment of the present invention.
Detailed Description
The invention is further described with reference to the drawings and the detailed description.
A multi-position detection system for specific gas refers to fig. 1, and comprises a laser light source 1, an optical fiber branching unit 3, at least two gas induction units 4, a photoelectric conversion detection unit 5 and a signal acquisition processing unit 6; in order to measure the gas state of each position to be measured, the gas sensing unit 4 is arranged at each position to be measured, and the gas sensing unit 4 comprises an outlet and an inlet; the laser light source 1 is connected with the optical fiber branching unit 3 through a transmission optical fiber, the optical fiber branching unit 3 is connected with an inlet of the gas sensing unit 4 through the transmission optical fiber, and an outlet of the gas sensing unit 4 is connected with the gas conversion detection unit through the transmission optical fiber; the photoelectric conversion detection unit 5 is connected with the signal acquisition processing unit 6; the laser light source 1 sends an optical signal to generate at least two optical signals through an optical fiber splitter 3, and the optical signals respectively pass through the gas sensing unit 4 and then are transmitted to the photoelectric conversion detection unit 5; the photoelectric conversion detection unit 5 converts the optical signals into electric signals representing the gas concentration of each position to be detected, the photoelectric conversion detection unit 5 sends the processed electric signals to the signal acquisition and processing unit 6, and the signal acquisition and processing unit 6 analyzes and processes the received electric signals to generate the gas concentration information of each position to be detected. One laser light source 1 generates multiple paths of optical signals through one optical fiber branching unit 3 to detect the gas at each position to be detected, and the function that one laser light source 1 simultaneously detects multiple positions to be detected is realized. The overall price of the laser is high, so that the cost of the whole gas detection system is high all the time. The gas at a plurality of positions can be detected only by one laser light source 1, compared with the prior art, the system cost is greatly reduced, and meanwhile, the reliability of the system is also improved. Meanwhile, only one laser light source 1 is used, so that the use of a power supply is reduced, the power consumption of the whole system is reduced, the system cost is reduced to a certain extent, and the laser light source system has a good application prospect.
In this embodiment, gaseous response unit 4 specifically is gaseous response chamber always, avoids light signal touching response intracavity wall to take place the loss, straight gaseous response chamber straight sets up, light signal is straight by the entry gets into straight gaseous response chamber is again by export transmission to photoelectric conversion detecting element 5, straight gaseous response chamber is used for reducing the coupling that produces when light signal passes through straight gaseous response chamber and exhausts. The length range of the straight gas induction cavity is 1 cm-99 cm.
In this embodiment, how the photoelectric conversion module detects an optical signal is specifically as follows, and the two cases are mainly divided into: (1) when the photoelectric conversion detection unit 5 includes a light intensity detection module; and the light intensity detection module measures the gas concentration of each position to be detected according to the intensity change of the optical signal. When the photoelectric conversion detection unit 5 includes a wavelength scanning detection module; and the wavelength scanning detection module is used for measuring the gas concentration of each position to be measured according to the intensity change of the wavelength scanning optical signals of the optical signals.
In the present embodiment, the laser light source 1 is specifically a laser light source 1 with a light source wavelength of 1653 nm. Light sources of other specifications can also be used as the laser light source 1, which all belong to the simple replacement of the embodiment and cannot limit the protection scope of the present invention.
The above, only be the preferred embodiment of the present invention, but the design concept of the present invention is not limited to this, and any skilled person familiar with the technical field is in the technical scope disclosed in the present invention, and it is right to utilize this concept to perform insubstantial changes to the present invention, all belong to the act of infringing the protection scope of the present invention.
Claims (7)
1. A multi-position detection system for specific gas is characterized by comprising a laser light source, an optical fiber branching unit, at least two gas induction units, a photoelectric conversion detection unit and a signal acquisition processing unit; the gas sensing units are arranged at each position to be tested and comprise outlets and inlets; the laser light source is connected with the optical fiber branching unit through a transmission optical fiber, the optical fiber branching unit is connected with an inlet of the gas sensing unit through the transmission optical fiber, and an outlet of the gas sensing unit is connected with the gas conversion detection unit through the transmission optical fiber; the photoelectric conversion detection unit is connected with the signal acquisition processing unit; the laser light source sends optical signals to generate at least two optical signals through the optical fiber branching unit, and the optical signals respectively pass through the gas sensing unit and then are transmitted to the photoelectric conversion detection unit; the photoelectric conversion detection unit converts the optical signal into an electric signal, the photoelectric conversion detection unit sends the processed electric signal to the signal acquisition and processing unit, and then the gas concentration of the position to be detected is measured.
2. The specific gas multi-position detection system according to claim 1, wherein the gas sensing unit is a straight gas sensing cavity, the light signal enters the straight gas sensing cavity from the entrance and then is transmitted to the photoelectric conversion detection unit from the exit, and the straight gas sensing cavity is used for reducing the coupling exhaustion generated when the light signal passes through the straight gas sensing cavity.
3. The specific gas multi-position detection system according to claim 2, wherein said photoelectric conversion detection unit comprises a light intensity detection module; and the light intensity detection module measures the gas concentration of each position to be detected according to the intensity change of the optical signal.
4. The gas specific multi-position detection system according to claim 3, wherein said photoelectric conversion detection unit comprises a wavelength scanning detection module; and the wavelength scanning detection module is used for measuring the gas concentration of each position to be measured according to the intensity change of the wavelength scanning optical signals of the optical signals.
5. The gas specific multi-position detection system according to claim 4, further comprising a signal acquisition processing unit; and the signal acquisition and processing unit analyzes and processes the received electric signals to generate gas concentration information of each position to be detected.
6. The specific gas multiple position detection system according to claim 5, wherein said laser light source is a laser light source with a light source wavelength of 1653 nm.
7. The gas specific multi-position detection system according to claim 5, wherein said straight gas sensing chamber has a length ranging from 1cm to 99 cm.
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| CN109459393A (en) * | 2018-12-25 | 2019-03-12 | 厦门蓝海之光科技有限公司 | Specific gas multiposition detection system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109459393A (en) * | 2018-12-25 | 2019-03-12 | 厦门蓝海之光科技有限公司 | Specific gas multiposition detection system |
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Effective date of registration: 20230918 Address after: 234000 Suzhou hi tech Industrial Development Zone, Anhui Province Patentee after: ANHUI BLUE OCEAN LIGHT TECHNOLOGY CO.,LTD. Address before: Room 203, No. 1726 Gangzhong Road, Xiamen Area, China (Fujian) Pilot Free Trade Zone, Xiamen City, Fujian Province, 361000 Patentee before: XIAMEN LANHAI ZHIGUANG TECHNOLOGY Co.,Ltd. |