Opposite emission type laser dust sensor

Abstract

The utility model relates to the technical field of equipment for detecting the concentration of suspended particulate matters in air, and discloses a correlation type laser dust sensor. Comprising a sampling main body, a detection area is arranged in the sampling main body, and a transmitting end, a light receiving end and a sampling receiving end adjacent to the transmitting end and the light receiving end are arranged on two side surfaces of the detection area; wherein the transmitting end comprises a laser tube arranged in the sampling main body and a collimating mirror positioned at a side opening of the detection area; the light receiving end comprises a light receiving material arranged in the sampling main body; and the sampling receiving end comprises a concave lens, an optical filter and a convex lens which are sequentially arranged from outside to inside. By optimizing the light scattering absorption principle, the accuracy of dust concentration measurement is remarkably improved. Secondly, the structural design of the sensor is compact, and a high-sealing material and a high-sealing structure are adopted, so that the sensor can stably work for a long time in a coal mine environment with high humidity, high dust and violent temperature change.

Description

TECHNICAL FIELD

[0001] The utility model relates to the equipment technical field of detecting the concentration of suspended particulate matters in air, and particularly relates to a laser dust sensor of opposite emission. BACKGROUND

[0002] The dust sensor is a kind of equipment for detecting the concentration of suspended particulate matters in air. In recent years, with the continuous attention of the state to coal mine safety production and the needs of enterprise modernization construction, all large, medium and small mines in China have successively installed coal mine monitoring and control systems. Dust seriously threatens the life safety of underground staff, mainly in that it can cause inestimable explosion accidents and seriously affect the health of underground staff. Therefore, dust monitoring and prevention become very necessary.

[0003] At present, dust sensors on the market mostly use light scattering method, beta ray method, laser scattering method and other technologies for dust concentration measurement. However, these sensors have some problems in actual application, such as insufficient measurement accuracy, poor equipment sealing, difficulty in adapting to harsh environment, etc. Especially in coal mine environment, dust concentration is high, humidity is large, temperature changes sharply, and the requirements for sensors are more stringent. Therefore, developing a new type of dust sensor more suitable for coal mine environment has become a problem to be solved. SUMMARY

[0004] The utility model aims at providing a laser dust sensor of opposite emission to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A laser dust sensor of opposite emission, comprising:

[0007] A sampling main body is internally provided with a detection area, the two side surfaces of the detection area are provided with a transmitting end and a light receiving end, and a sampling receiving end adjacent to the transmitting end and the light receiving end;

[0008] Among them, the transmitting end includes a laser tube arranged in the sampling main body and a collimating mirror located at the side opening of the detection area; the light receiving end includes a light receiving material arranged in the sampling main body; the sampling receiving end includes a concave lens, a filter and a convex lens arranged in turn from outside to inside.

[0009] As a preferred scheme of the utility model, the transmitting end and the light receiving end are on the same horizontal line.

[0010] As a preferred scheme of the utility model, the light receiving channel is arranged between the light receiving material and the other side opening of the detection area.

[0011] As one preferred scheme of the utility model, the lateral surface of the sampling main body is provided with a lateral surface cover for sealing the transmitting end and the light receiving end.

[0012] As one preferred scheme of the utility model, a first installation cavity is arranged in the sampling main body, and the inner wall of the first installation cavity is provided with a receiving circuit board.

[0013] As one preferred scheme of the utility model, a sampling channel is arranged between the receiving circuit board and the convex lens.

[0014] As one preferred scheme of the utility model, a second installation cavity is arranged in the sampling main body and communicates with the first installation cavity, a connecting top plate is embedded in the second installation cavity and is fixed by screws.

[0015] As one preferred scheme of the utility model, a mounting hole is arranged on the connecting top plate, and the mounting hole leads out the communication and power lines on the receiving circuit board.

[0016] The utility model has the advantages of the following: the dust concentration measurement accuracy is improved by optimizing the light scattering and absorption principle; the sensor has compact structure design, high sealing material and structure, and can work stably in the coal mine environment with high humidity, high dust and temperature change; the sensor has good waterproof and dustproof performance, strong linkage control ability with other monitoring equipment, and can realize integrated application of multiple monitoring functions; and the appearance design of the utility model is optimized, so that the sensor installation and maintenance are more convenient, and the user operation experience is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments or prior art, the drawings needed in the embodiments will be briefly introduced as follows, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art according to these drawings.

[0018] Fig. 1 It is an overall explosion structure schematic view of the utility model.

[0019] Fig. 2 It is a sampling main body three-dimensional structure schematic view of the utility model.

[0020] Fig. 3 It is a sampling main body cross-sectional structure schematic view of the utility model.

[0021] Explanation of reference signs:

[0022] 1, sampling main body; 2, detection area; 3, emitting end; 31, collimating mirror; 32, laser tube; 4, side cover; 5, first mounting cavity; 6, second mounting cavity; 7, receiving circuit board; 8, connecting top plate; 81, mounting hole; 9, sampling receiving end; 91, concave lens; 92, optical filter; 93, convex lens; 94, sampling channel; 10, light receiving end; 101, light receiving material; 102, light receiving channel. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0024] Referring to Figs. 1 to 3 As shown in the drawings, the present application provides a kind of against the laser dust sensor of type, including: sampling main body 1, its inside is provided with detection area 2, the detection area 2 is from top to bottom through sampling main body 1 A space, the shape of the space includes but is not limited to square, polygon, triangle, and detection area 2 is used to define the path of laser and the specific position of detection, to identify and measure the concentration and characteristics of particulate matter in this area or space, that is, the place needed is detected. On the other hand, in order to isolate the whole area to be detected, reduce the interference of external light source and other environmental factors, improve the accuracy and reliability of detection. At the same time, it can be designed into appropriate size and shape according to the need, ensure that laser beam is uniformly distributed in this characteristic area, and the design of detection area 2 also combines with the change of air flow, so that particulate matter is more easily entered into the area.

[0025] In addition, the two sides of detection area 2 are provided with emitting end 3 and light receiving end 10, and sampling receiving end 9 adjacent to emitting end 3 and light receiving end 10. Specifically, emitting end 3 includes laser tube 32 arranged in sampling main body 1 and collimating mirror 31 located at the side opening of detection area 2; light receiving end 10 includes light receiving material 101 arranged in sampling main body 1; sampling receiving end 9 includes concave lens 91, optical filter 92 and convex lens 93 arranged in order from outside to inside.

[0026] In the embodiment, the sensor is first installed at a monitoring position in the coal mine, and the access and linkage control with other monitoring devices are ensured. After the sensor is started, the laser tube 32 emits laser, and the light is accurately shot to the target area through the collimating mirror 31. The suspended particulate matters in the air will cause the scattering of the light, and part of the scattered light is captured by the light receiving material 101 of the light receiving end 10 and reflected back to the sampling receiving end 9. The sampling receiving end 9 further processes the light signal, converts it into an electrical signal and transmits it to the receiving circuit board 7. Finally, the sensor transmits the processed data to the monitoring system through the communication line, realizes the real-time measurement or monitoring of the dust concentration, optimizes the practicability and measurement accuracy of the sensor, improves the sealing of the sensor, is suitable for various harsh environments, can be independently connected to the system, linked with various sensors and devices, waterproof and dustproof inside, and the appearance is also optimized, realizing a new detection mode of the dust sensor.

[0027] The collimating mirror 31 is made of quartz glass or other materials with high light transmittance, the laser tube 32 is made of an aluminum gallium indium phosphorus laser with high stability or other materials, the laser tube 32 emits laser to the collimating mirror 31, and the light beam can be converted into a parallel light beam, thereby improving the quality and transmission distance of the light beam. Moreover, the divergence angle of the laser beam can be significantly reduced, so that the laser can still maintain a small spot size at a long distance, ensuring that the laser beam emitted by the emitting end 3 accurately passes through the detection area 2, thereby improving the detection accuracy of the scattered light of the suspended particulate matters in the air.

[0028] The light receiving material 101 can be a high-sensitivity silicon photodiode or other materials, which can ensure the complete reception of the laser overflow and improve the stability and accuracy of the data. The light receiving material 101 and the other side opening of the detection area 2 are provided with a light receiving channel 102, which is long to reduce the interference of stray light and improve the accuracy of the data. Moreover, the contact area of the light and the light receiving material 101 is increased, and the absorption efficiency of the scattered light is improved.

[0029] In addition, the emitting end 3 and the light receiving end 10 are on the same horizontal line, which can reduce the deflection or scattering of the signal in the propagation process, thereby reducing the optical loss, ensuring that more laser beams can be effectively received, and making the detection result more reliable.

[0030] The concave lens 91, the filter 92 and the convex lens 93 used in the sampling receiving end 9 all adopt optical glass or other materials with high light transmittance, so that light scattering can be well avoided, and the accuracy of the received data is more accurate. Among them, the convex lens 93 can effectively focus the light from the target area, so that the light is more concentrated, which helps to improve the receiving efficiency and accuracy of the sensor. The concave lens 91 can expand the light beam and form a wider incident angle at the receiving end, which helps to improve the flexibility of light collection and receive more light signals. The filter 92 can selectively allow light of a specific wavelength to pass through, filter out unwanted spectral components, and weaken the influence of ambient light, thereby improving the reliability and accuracy of the measurement. Moreover, it can effectively suppress the interference of stray light and ambient light on the measurement signal of gas or particulate matter, and improve the clarity of the measurement data.

[0031] The side surface of the sampling main body 1 is provided with a side cover 4 for sealing the emitting end 3 and the light receiving end 10, which can prevent external dust and moisture from entering the internal structure and improve the working stability and service life of the equipment in harsh environments.

[0032] In addition, a first mounting cavity 5 is formed in the sampling main body 1, and the inner wall of the first mounting cavity 5 is provided with a receiving circuit board 7. A second mounting cavity 6 is formed in the sampling main body 1 and communicates with the first mounting cavity 5, and a connecting top plate 8 is embedded in the second mounting cavity 6 and fixed by screws.

[0033] The connecting top plate 8 is provided with a mounting hole 81, which leads out the communication and power lines on the receiving circuit board 7, and supports multiple interface access, which is convenient for linkage with other equipment.

[0034] Among them, the receiving circuit board 7 and the convex lens 93 are provided with a sampling channel 94. The sampling channel 94 can be flexibly set to adapt to different environments and application scenarios, and the scattering and loss of light in the transmission process are reduced, thereby improving the overall performance of the system to improve the accuracy and reliability of the subsequent.

[0035] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application should not be limited to the embodiments shown herein, but should be consistent with the widest scope of principles and novel features disclosed herein.

Claims

1. A forward scattering laser dust sensor, characterized in that The application relates to a sampling body with a detection area arranged inside, two side faces of the detection area being provided with a transmitting end and a light receiving end, and a sampling receiving end adjacent to the transmitting end and the light receiving end. The transmitting end comprises a laser tube arranged in the sampling body and a collimating mirror arranged on the side opening of the detection area; the light receiving end comprises light receiving material arranged in the sampling body; and the sampling receiving end comprises a concave lens, a filter and a convex lens arranged in sequence from the outside to the inside. The transmitting end and the light receiving end are on the same horizontal line.

2. The backscatter laser dust sensor of claim 1, wherein: A light receiving channel is arranged between the light receiving material and the other side opening of the detection area.

3. The backscatter laser dust sensor of claim 1, wherein: Side covers are arranged on the side faces of the sampling body for sealing the transmitting end and the light receiving end.

4. The backscatter laser dust sensor of claim 1, wherein: A first mounting cavity is arranged in the sampling body, and a receiving circuit board is arranged on the inner wall of the first mounting cavity.

5. The backscatter laser dust sensor of claim 1, wherein: A sampling channel is arranged between the receiving circuit board and the convex lens.

6. The backscatter laser dust sensor of claim 5, wherein: A second mounting cavity is arranged in the sampling body and communicates with the first mounting cavity, a connecting top plate is embedded in the second mounting cavity, and the connecting top plate is fixed through screws.

7. The backscatter laser dust sensor of claim 5, wherein: Mounting holes are arranged on the connecting top plate, and the mounting holes lead out communication and power supply lines on the receiving circuit board for connection.

8. The opposed beam laser dust sensor according to claim 7, characterized in that: ​

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