Indicating laser adjusting system for in-situ laser gas analyzer

Abstract

The utility model belongs to the technical field of gas monitoring, and provides an indication laser adjusting system for an in-situ laser gas analyzer, which comprises a transmitting assembly, a receiving assembly and a corrugated pipe, the emission assembly is provided with a first light source used for emitting first laser; the second light source is used for emitting second laser; one surface of the dichroscope faces the first light source, the other surface of the dichroscope faces the second light source, and the dichroscope is used for transmitting the first laser, reflecting the second laser and coaxially overlapping the transmitted first laser and the reflected second laser; the receiving assembly is located on one side of the transmitting assembly and located on a laser path after coaxial repetition. According to the utility model, the dichroscope and the coated convex lens are arranged, laser can be transmitted or reflected to the coated convex lens through the dichroscope, and the laser path of the light source can be adjusted by adjusting the position of the laser on the coated convex lens, so that the condition of light path offset is effectively maintained, and the emission assembly and the receiving assembly do not need to be disassembled and assembled; and the operation process is simplified.

Description

Technical Field

[0001] This utility model belongs to the field of gas monitoring technology, and specifically relates to an indicator laser adjustment system for an in-situ laser gas analyzer. Background Technology

[0002] In-situ laser gas analyzers, installed at both ends of the flue, can quickly monitor changes in gas concentration during industrial processes, and the test results are highly representative, making them the most commonly used gas monitoring equipment in the field of online monitoring of industrial process gases. However, laser gas analyzers use red laser light sources, which are invisible light sources, especially mid-infrared and far-infrared sources, which are difficult to observe using conventional methods. When using infrared laser sources, the laser wavelength is usually above 1.0µm, which is also in the invisible light band. Therefore, visible light assistance is required during the optical path debugging process. For on-site installation and debugging of in-situ laser gas analyzers, laser pointers and light targets are generally used for assistance. Current equipment is generally debugged online. In addition, optical path offset maintenance requires disassembly and reassembly of the transmitting and receiving units, which is too cumbersome, consumes a lot of time and manpower, and may even affect industrial production. Moreover, some laser gas analyzers use the method of enlarging the laser spot (beam expansion) to increase the adjustable range, which results in large laser energy loss, causing equipment performance degradation and inaccurate measurement results (reduced signal-to-noise ratio). Utility Model Content

[0003] To address the problems in the background art, this utility model proposes an indicator laser adjustment system for an in-situ laser gas analyzer.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An indicator laser adjustment system for an in-situ laser gas analyzer includes a transmitting component, a receiving component, and a bellows.

[0006] The transmitting component is provided with:

[0007] The first light source is used to emit the first laser beam;

[0008] A second light source, used to emit a second laser;

[0009] A dichroic mirror, with one side facing the first light source and the other side facing the second light source, is used to transmit the first laser and reflect the second laser, and to make the transmitted first laser and the reflected second laser coaxial and coincident.

[0010] The receiving component is located on one side of the transmitting component, on the laser path after coaxial repetition:

[0011] The bellows are provided in several units and are located on the path of the second laser between the dichroic mirror and the receiving component;

[0012] At least one bellows is mounted on the transmitting assembly;

[0013] At least one bellows is mounted on the receiving assembly.

[0014] Preferably, the launch assembly also includes a launch pad;

[0015] The first light source, the dichroic mirror, and the second light source are all mounted on the surface of the launch pad.

[0016] Preferably, the launch assembly further includes an operator and a display, which are electrically connected and both are located on the surface of the launch pad;

[0017] The manipulator is electrically connected to the first light source and the second light source respectively;

[0018] The display is electrically connected to the first light source and the second light source, respectively.

[0019] Preferably, the angle between the first laser and the dichroic mirror is 0 to 90°, and the angle between the second laser and the dichroic mirror is 0 to 90°.

[0020] Preferably, the angle between the first laser and the dichroic mirror is 45°, and the angle between the second laser and the dichroic mirror is 45°.

[0021] Preferably, the receiving component includes a coated convex lens, a detector, and a receiving stage;

[0022] The coated convex lens is positioned toward the dichroic mirror and located on the laser path after the lasers overlap.

[0023] The detector is located on the side of the coated convex lens away from the dichroic mirror;

[0024] Both the coated convex lens and the detector are located on the surface of the receiving stage;

[0025] The detector is electrically connected to the display.

[0026] Preferably, the surface of the receiving station is also equipped with an observation window, which is located on one side of the indicator path and is used to observe the position of the second laser spot on the coated convex lens.

[0027] Preferably, two bellows are provided, one installed on the side of the transmitter and the other installed on the side of the receiver.

[0028] Preferably, the corrugated pipe includes a pipe body, a flange, and fastening bolts;

[0029] Two flanges are provided, which are respectively connected to both ends of the pipe body;

[0030] At least three fastening bolts are provided, evenly distributed along the circumference of the pipe body, and connected to two flange bolts.

[0031] Preferably, the first laser is an infrared laser, and the second laser is a visible laser.

[0032] The beneficial effects of this utility model are:

[0033] 1. This utility model is equipped with a dichroic mirror and a coated convex lens. The dichroic mirror can transmit or reflect the laser to the coated convex lens. By adjusting the position of the laser on the coated convex lens, the laser path of the light source can be adjusted, effectively maintaining the optical path offset. It does not require disassembly and assembly of the transmitting and receiving components, simplifying the operation process.

[0034] 2. The adjustment method of this utility model adjusts the position of the second laser. The first laser is turned on only after the spot of the second laser on the coated convex lens is adjusted to the target position. This process avoids the simultaneous activation of the first and second lasers, effectively avoiding the problem of excessive laser beam energy.

[0035] 3. This utility model adds a visible indicator laser path to the original laser optical path at the instrument transmitter by using a visible laser source, a dichroic mirror, and a three-dimensional adjustment structure. The visible indicator laser is coaxial with the infrared laser through the coordinate adjustment structure, eliminating the need for amplifying the laser spot (beam expander). Furthermore, an observation window and a coated lens are added to the receiving unit to observe the laser landing point. The position of the visible laser landing point can be observed through the observation window, and the laser path of the light source can be adjusted by adjusting the position of the laser on the coated convex lens. This effectively prevents optical path misalignment and eliminates the need for external lasers and multiple disassembly and adjustment, simplifying the initial installation and subsequent maintenance of the equipment.

[0036] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the structures pointed out in the description and the accompanying drawings. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 A schematic diagram of the structure of an indicator laser adjustment system for an in-situ laser gas analyzer according to the present invention is shown;

[0039] Figure 2 A structural diagram of the transmitting unit of this utility model is shown;

[0040] Figure 3 The optical path diagram of the indicator laser adjustment system of this utility model is shown;

[0041] Figure 4 A schematic diagram of the bellows structure of this utility model is shown;

[0042] Figure 5 A flowchart of an indication laser adjustment method for an in-situ laser gas analyzer according to the present invention is shown.

[0043] In the diagram: 1. First light source; 2. Coordinate adjustment mechanism; 3. Dichroic mirror; 4. Second light source; 5. Coated convex lens; 6. Detector; 7. Transmitter; 8. Receiver; 9. Observation window; 10. Operator; 11. Display; 12. Bellows; 1201. Pipe body; 1202. Flange; 1203. Fastening bolt. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0045] An indicator laser control system for an in-situ laser gas analyzer, such as Figure 1 As shown, it includes a transmitting component, a receiving component, and a bellows 12.

[0046] Combination Figure 1 and Figure 2 It is known that the emitting assembly includes a first light source 1, a coordinate adjustment mechanism 2, a dichroic mirror 3, a second light source 4, and a emitting platform 7. The first light source 1 emits a first laser, which is an invisible laser, such as an infrared laser. The second light source 4 emits a second laser, which is a visible laser. The dichroic mirror 3 has one side facing the first light source 1 and the other side facing the second light source 4. It can transmit the first laser and reflect the second laser, and the transmitted first laser and the reflected second laser are coaxially aligned.

[0047] It should be noted that the visible light source has a high beam transmittance and an energy of less than 5mw, which can meet the requirements for use in explosion-proof environments. The characteristic of the dichroic mirror 3 is that one side transmits light of a certain wavelength almost completely, while the other side reflects light of a certain wavelength almost completely.

[0048] It should be further explained that the coordinate adjustment mechanism 2 is a cage-like structure, which is connected to the second light source 4 to adjust the spatial position of the second light source 4. For example, it can be an electric adjustment mechanism, which drives a gear or lead screw through an electric motor and works with a sensor to achieve precise position adjustment of the second light source 4; or it can be a manual adjustment mechanism, which adjusts the position of the second light source 4 by manually rotating a knob or moving a slider.

[0049] In addition, the first light source 1, the dichroic mirror 3, and the second light source 4 are all installed on the surface of the transmitting station 7. The first light source 1 and the second light source 4 correspond to the two surfaces of the dichroic mirror 3, respectively. The dichroic mirror 3 is installed at a certain angle, so that the angle between the first laser and the dichroic mirror 3 is 0 to 90°, specifically 45°. The angle between the second laser and the dichroic mirror 3 is 0 to 90°, specifically 45°.

[0050] Combination Figure 1 and Figure 3 As can be seen, the receiving component is located on one side of the transmitting component and includes a coated convex lens 5, a detector 6, a receiving platform 8, and an observation window 9. The coated convex lens 5, detector 6, and observation window 9 are all mounted on the receiving platform 8. The coated convex lens 5 faces the dichroic mirror 3 and is located on the path of the second laser. The detector 6 is located on the side of the coated convex lens 5 away from the dichroic mirror 3. It can detect the intensity of the second laser, and its function is to receive the light intensity signal from the transmitting component. The detection principle is based on infrared spectral absorption; the concentration of the gas being measured is inverted by analyzing the absorbed spectrum. The observation window 9 is located on the indicating path side. From this position, the surface of the coated convex lens 5 can be observed, thus obtaining the position of the second laser spot on the coated convex lens 5.

[0051] It should be noted that the detection surface of detector 6 is located near the focal point of the coated lens, allowing the diverging light spot to be converged and concentrated onto the surface of detector 6 through the lens, thus improving the utilization rate of laser light intensity. Furthermore, detector 6 can analyze the light intensity signal and transmit the processed signal to display 11. Detector 6 converts the light signal into an electrical signal. In practical applications, the transmitting and receiving components are connected via cables, and the electrical signal from detector 6 is transmitted to the transmitting component through the cables.

[0052] Several bellows 12 are provided, located on the second laser path between the dichroic mirror 3 and the coated convex lens 5. At least one bellows 12 is mounted on the side of the transmitting stage 7 of the transmitting assembly; at least one bellows 12 is mounted on the side of the receiving stage 8 of the receiving assembly. Specifically, in Figure 1 There are two corrugated tubes 12. The area between the two corrugated tubes 12 contains the gas A to be detected. During normal operation, the second laser can pass through the corrugated tube 12 on the transmitting station 7 side through the gas A to be detected and reach the corrugated tube 12 on the receiving station 8 side.

[0053] exist Figure 1 The launching assembly also includes an operator 10 and a display 11, which are electrically connected and both are located on the surface of the launching platform 7. The operator 10 is electrically connected to the first light source 1 and the second light source 4, and the display 11 is electrically connected to the first light source 1, the second light source 4 and the detector 6.

[0054] It should be noted that the operator can control the first light source 1 and the second light source 4 to emit lasers through the operator 10, thereby obtaining the second laser. The display 11 provides I / O control, and the second laser can be turned on / off through the operator 10.

[0055] like Figure 2 As shown, the corrugated pipe 12 includes a pipe body 1201, flanges 1202, and fastening bolts 1203. There are two flanges 1202, which are respectively connected to both ends of the pipe body 1201; there are at least three fastening bolts 1203, which are evenly distributed along the circumference of the pipe body 1201 and are bolted to the two flanges 1202.

[0056] It should be noted that during operation, the bellows 12 can be compressed in a certain direction by tightening the fastening bolt 1203, thereby achieving slight deformation. For example, when the uppermost fastening bolt 1203 is tightened, the bellows 12 will bend slightly upwards. When the second laser passes through the bellows 12, its laser path will be slightly deflected due to the bending of the bellows 12.

[0057] The following describes a method for adjusting the indicator laser in an in-situ laser gas analyzer, applied to... Figure 1 The indicating laser adjustment system for an in-situ laser gas analyzer includes an infrared laser as the first laser and a visible laser as the second laser, such as... Figure 5 As shown, it includes the following steps:

[0058] S1: A second laser is emitted through the second light source 4, and the second laser serves as an indicator laser.

[0059] S2: The second laser is reflected by the dichroic mirror 3.

[0060] S3: The second laser is passed through the bellows 12 and irradiated onto the coated convex lens 5.

[0061] S4: Obtain the real-time position of the second laser spot on the coated convex lens 5. If the real-time position is inconsistent with the target position, adjust it through the bellows 12 until the real-time position is consistent with the target position.

[0062] S5: The first laser is emitted through the first light source 1.

[0063] S6: The first laser is transmitted through the dichroic mirror 3, so that the transmitted first laser and the reflected second laser are coaxially aligned.

[0064] S7: Obtain the light intensity of the overlapping first and second lasers through detector 6, determine whether the light intensity is the maximum value, if it is the maximum value, the adjustment is complete, otherwise readjust.

[0065] It should be noted that the first light source 1 and the second light source 4 are not turned on at the same time. This is to prevent the laser beam energy from being too high when they are turned on together, which would exceed the safe light radiation power for special occasions.

[0066] It should be noted that in S4, the location of the second laser spot is determined through observation window 9. Observation window 9 allows for complete observation of the plano-convex lens. Furthermore, observation window 9 is made of colorless tempered glass, suitable for various applications. Additionally, the target location in S4 is the center of the coated convex lens 5. When the second laser spot falls on the center of the coated convex lens 5, the second laser beam is further focused onto the surface of detector 6, resulting in maximum light intensity and energy. Therefore, when the second laser is located at the center of the coated convex lens 5, all light intensity is focused on detector 6. At this point, simply ensuring that the first and second laser beams coincide is sufficient for calibration.

[0067] It should be further noted that when readjusting in S7, the readjustment must be started from S1 and continued until the readjustment is complete.

[0068] In some embodiments, S4 is adjusted via the bellows 12 until the real-time position matches the target position, including the following steps:

[0069] If the laser spot deviates in the first direction, the bellows 12 is fastened to the transmitting component in the first direction, or the bellows 12 is fastened to the receiving component in the opposite direction to the first direction, or the bellows 12 is fastened to the transmitting component in the first direction and the bellows 12 is fastened to the receiving component in the opposite direction to the first direction.

[0070] Combination Figures 1 to 4 The specific adjustment method for the bellows 12 is as follows: Using the position of the transmitter 7 as a reference, the adjustment direction of the transmitter is aligned with the desired adjustment direction by adjusting the fastening bolts 1203 of the bellows 12. The adjustment direction of the receiver is opposite to the desired adjustment direction. For example, if the light spot needs to be adjusted upwards, the fastening bolts 1203 above the bellows 12 connected to the transmitter 7 are tightened, or the fastening bolts 1203 below the bellows 12 connected to the receiver 8 are tightened.

[0071] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An indicator laser adjustment system for an in-situ laser gas analyzer, characterized in that, Includes a transmitting component, a receiving component, and a bellows (12); The transmitting component is provided with: The first light source (1) is used to emit the first laser beam; The second light source (4) is used to emit the second laser; A dichroic mirror (3) has one side facing the first light source (1) and the other side facing the second light source (4). It is used to transmit the first laser and reflect the second laser, and to make the transmitted first laser and the reflected second laser coaxial and coincident. The receiving component is located on one side of the transmitting component, on the coaxial laser path: The bellows (12) are provided in several places, located on the path of the second laser between the dichroic mirror (3) and the receiving component; At least one bellows (12) is mounted on the transmitting assembly; At least one bellows (12) is mounted on the receiving assembly.

2. The indicator laser adjustment system for an in-situ laser gas analyzer according to claim 1, characterized in that, The launch assembly also includes a launch pad (7); The first light source (1), the dichroic mirror (3), and the second light source (4) are all mounted on the surface of the transmitter (7).

3. The indicating laser adjustment system for an in-situ laser gas analyzer according to claim 1, characterized in that, The launch assembly also includes an operator (10) and a display (11), which are electrically connected and are both located on the surface of the launch pad (7); The manipulator (10) is electrically connected to the first light source (1) and the second light source (4) respectively; The display (11) is electrically connected to the first light source (1) and the second light source (4).

4. The indicating laser adjustment system for an in-situ laser gas analyzer according to claim 1, characterized in that, The angle between the first laser and the dichroic mirror (3) is 0 to 90°, and the angle between the second laser and the dichroic mirror (3) is 0 to 90°.

5. The indicating laser adjustment system for an in-situ laser gas analyzer according to claim 4, characterized in that, The angle between the first laser and the dichroic mirror (3) is 45°, and the angle between the second laser and the dichroic mirror (3) is 45°.

6. The indicating laser adjustment system for an in-situ laser gas analyzer according to claim 3, characterized in that, The receiving component includes a coated convex lens (5), a detector (6), and a receiving station (8); The coated convex lens (5) is positioned toward the dichroic mirror (3) and located on the laser path after overlap; The detector (6) is located on the side of the coated convex lens (5) away from the dichroic mirror (3); The coated convex lens (5) and the detector (6) are both located on the surface of the receiving station (8); The detector (6) is electrically connected to the display (11).

7. The indicating laser adjustment system for an in-situ laser gas analyzer according to claim 6, characterized in that, The receiving station (8) is also equipped with an observation window (9) located on the side of the indicator path, which is used to observe the position of the second laser spot on the coated convex lens (5).

8. The indicating laser adjustment system for an in-situ laser gas analyzer according to claim 7, characterized in that, Two bellows (12) are provided, one installed on the side of the transmitter (7) and the other installed on the side of the receiver (8).

9. The indicating laser adjustment system for an in-situ laser gas analyzer according to claim 8, characterized in that, The corrugated pipe (12) includes a pipe body (1201), a flange (1202), and fastening bolts (1203); Two flanges (1202) are provided, which are respectively connected to both ends of the pipe body (1201); At least three fastening bolts (1203) are provided, evenly distributed along the circumference of the pipe body (1201), and bolted to the two flanges (1202).

10. A laser indication adjustment system for an in-situ laser gas analyzer according to any one of claims 1-9, characterized in that, The first laser is an infrared laser, and the second laser is a visible laser.

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