TDLAS (tunable diode laser absorption spectroscopy) greenhouse gas monitoring instrument

Abstract

The utility model discloses a TDLAS (Tunable Diode Laser Absorption Spectroscopy) greenhouse gas monitoring instrument which comprises a TDLAS gas remote sensing laser, a laser mounting seat, a reflecting mirror and a reflecting mirror mounting seat, the TDLAS gas remote sensing laser comprises a laser emitting unit and a laser detection unit, and a laser outlet of the laser emitting unit and a laser detection port of the laser detection unit are arranged on the same side of the TDLAS gas remote sensing laser; the reflecting mirror is arranged on an emergent / incident light path of the TDLAS gas remote sensing laser; the laser mounting seat comprises a first height adjusting device, and the TDLAS gas remote sensing laser is mounted on the first height adjusting device; the reflector mounting seat comprises a second height adjusting device and an angle adjusting device mounted at the top of the second height adjusting device, and the reflector is mounted on the angle adjusting device. An open light path design is adopted, the TDLAS gas remote sensing laser and the reflector are oppositely arranged on the two sides of a gas field, non-contact measurement can be conveniently carried out on gas emission in the atmosphere, and therefore the gas emission condition of the field can be rapidly obtained.

Description

Technical Field

[0001] The utility model relates to the field of gas monitoring, in particular to a TDLAS greenhouse gas monitoring instrument. Background Art

[0002] Greenhouse gases primarily include CO2, CH4, and N2O. These gases in the atmosphere absorb longwave radiation reflected by the ground and re-emit it, similar to how a greenhouse traps solar radiation and heats the air inside, causing the Earth's surface to warm. This effect, known as the "greenhouse effect," contributes to Earth's warming. The presence of greenhouse gases has a significant impact on Earth's climate system, including global warming, climate change, and the frequency of extreme weather events.

[0003] TDLAS (Tunable Diode Laser Absorption Spectroscopy) mainly utilizes the narrow linewidth and wavelength of tunable semiconductor lasers that change with the injection current. By modulating the wavelength of the laser, the laser wavelength is scanned across the absorption peak of the gas molecules being measured. Based on the Lambert-Beer law, the gas molecules absorb the modulated laser light, and the gas molecule concentration is measured based on the absorption amount.

[0004] However, the laser and mirror in current TDLAS systems are usually fixed together, which is very inconvenient to transport for lasers and mirrors in an open optical path. In addition, the current lasers and mirrors cannot be adjusted in height or angle as needed. Utility Model Content

[0005] The utility model aims to provide a TDLAS greenhouse gas monitoring instrument to solve the problems in the existing TDLAS that the laser and the reflector are inconvenient to transport because they are fixed together and their height or angle cannot be adjusted as needed.

[0006] In order to solve the above technical problems, the present invention provides a TDLAS greenhouse gas monitoring instrument, including a TDLAS gas remote sensing laser, a laser mounting base, a reflector and a reflector mounting base; the TDLAS gas remote sensing laser includes a laser emitting unit and a laser detection unit, and the laser outlet of the laser emitting unit and the laser detection port of the laser detection unit are arranged on the same side of the TDLAS gas remote sensing laser; the reflector is arranged on the outgoing / incoming light path of the TDLAS gas remote sensing laser; the laser mounting base includes a first height adjustment device, and the TDLAS gas remote sensing laser is mounted on the first height adjustment device; the reflector mounting base includes a second height adjustment device and an angle adjustment device mounted on the top of the second height adjustment device, and the reflector is mounted on the angle adjustment device.

[0007] Furthermore, the first height adjustment device includes at least three first columns, and at least three clamps matching the first columns are provided on the side wall of the TDLAS gas remote sensing laser; the TDLAS gas remote sensing laser clamps the first columns through the clamps.

[0008] Furthermore, the first height adjustment device includes three first columns, and three hoops that match the first columns are provided on the side wall of the TDLAS gas remote sensing laser.

[0009] Furthermore, the clamp includes two semicircular clamp bodies, one end of the two clamp bodies is fixedly connected to the side wall of the TDLAS gas remote sensing laser through a fixing plate; the other end of the two clamp bodies is provided with a connecting ear, and the connecting ears of the two clamp bodies are fixedly connected by a locking piece.

[0010] Furthermore, the clamp and the fixing plate are integrally formed, and the fixing plate is fixedly connected to the side wall of the TDLAS gas remote sensing laser via fasteners.

[0011] Furthermore, the second height adjustment device includes a second column, a second base and a screw; the top of the second base is provided with a downwardly recessed mounting groove, the bottom end of the second column extends into the mounting groove and can slide longitudinally along the mounting groove; one end of the screw penetrates the groove wall of the mounting groove and extends into the mounting groove to abut against the second column, and the other end of the screw is fixed with a knob.

[0012] Furthermore, the angle adjustment device includes an L-shaped bracket and an adjusting bolt; the L-shaped bracket is fixedly installed on the top of the second height adjustment device, and a threaded through hole is installed at each end of the L-shaped bracket; the reflector is installed on the mirror frame, and the mirror frame is provided with two threaded countersunk holes that match the threaded through holes; the adjusting bolt passes through the threaded through hole and extends into the threaded countersunk hole.

[0013] Furthermore, the two threaded countersunk holes are arranged on an extension line of the same diameter of the reflector.

[0014] Furthermore, a plurality of reset springs arranged at intervals are connected between the frame and the L-shaped bracket.

[0015] Furthermore, a first spring mounting hole is provided on the side of the frame facing the L-shaped bracket; a second spring mounting hole is provided on the side of the L-shaped bracket facing the frame, the first spring mounting hole and the second spring mounting hole are opposite to each other, and both ends of the spring are respectively installed in the first spring mounting hole and the second spring mounting hole.

[0016] The beneficial effects of the utility model are:

[0017] The monitoring instrument adopts an open optical path design, placing the TDLAS gas remote sensing laser and reflector on both sides of the gas site, which can facilitate non-contact measurement of gas emissions in the atmosphere, thereby quickly obtaining on-site gas emission conditions.

[0018] By setting the laser mounting bracket and the reflector mounting bracket, the TDLAS gas remote sensing laser and the reflector can be easily adjusted according to the installation conditions, so that the laser spot emitted by the laser emitting unit can hit the reflector surface, and at the same time ensure that the reflected light spot of the reflector can be shot into the laser detection port of the laser detection unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The same reference numerals are used in these drawings to represent the same or similar parts. The exemplary embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 This is a structural diagram of an embodiment of the present utility model.

[0021] Figure 2 This is a structural schematic diagram of a laser mounting base according to an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the installation of a reflector according to an embodiment of the present invention.

[0023] Figure 4 This is a schematic structural diagram of a reflector mounting base according to an embodiment of the present invention.

[0024] Figure 5 This is a structural diagram of a mirror frame according to an embodiment of the present invention.

[0025] Among them: 1. Reflector; 2. TDLAS gas remote sensing laser; 21. Laser exit / entry window; 3. Height adjustment; 31. First column; 32. Clamp; 4. TDLAS control system; 5. Host computer; 6. Mirror frame; 61. Threaded countersunk hole; 62. First spring mounting hole; 7. L-shaped bracket; 71. Threaded through hole; 72. Second spring mounting hole; 8. Second column; 81. Base; 82. Screw. DETAILED DESCRIPTION

[0026] The invention discloses a TDLAS greenhouse gas monitoring instrument, comprising a TDLAS gas remote sensing laser 2, a laser mounting base, a reflector 1 and a reflector mounting base; the TDLAS gas remote sensing laser 2 comprises a laser emitting unit and a laser detection unit, wherein a laser outlet of the laser emitting unit and a laser detection port of the laser detection unit are arranged on the same side of the TDLAS gas remote sensing laser 2; the reflector 1 is arranged on an exit / entry optical path of the TDLAS gas remote sensing laser 2, so that an open gas measurement optical path is formed between the reflector 1 and the TDLAS gas remote sensing laser 2; the laser mounting base comprises a first height adjustment device 3, and the TDLAS gas remote sensing laser 2 is mounted on the first height adjustment device 3; the reflector mounting base comprises a second height adjustment device 3 and an angle adjustment device mounted on top of the second height adjustment device 3, and the reflector 1 is mounted on the angle adjustment device.

[0027] This monitoring instrument uses an open optical path design, placing the TDLAS gas remote sensing laser 2 and reflector 1 opposite each other on either side of the gas site. This facilitates non-contact measurement of atmospheric gas emissions, enabling rapid acquisition of on-site gas emission conditions. Furthermore, by providing a laser mounting bracket and a reflector mounting bracket, the monitoring instrument facilitates adjustment of the TDLAS gas remote sensing laser 2 and reflector 1 according to installation conditions, ensuring that the laser spot emitted by the laser emitting unit can strike the surface of reflector 1 and that the reflected light spot from reflector 1 can enter the laser detection port of the laser detection unit.

[0028] The laser emission unit can use a QCL quantum cascade laser. When measuring, first adjust the laser wavelength of the QCL quantum cascade laser, then connect the laser detection unit to the existing TDLAS control system 4 through the DB15 interface to achieve harmonic demodulation. After signal processing, a high-precision gas concentration signal is obtained. Then, the TDLAS control system 4 is connected to the host computer 5 through USB to display and record the gas concentration measurement results. Figure 1 shown.

[0029] According to one embodiment of the present application, Figure 1 and Figure 2 As shown, the first height adjustment device 3 includes at least three first columns 31. The sidewalls of the TDLAS gas remote sensing laser 2 are provided with at least three clamps 32 that cooperate with the first columns 31. The TDLAS gas remote sensing laser 2 is clamped to the first columns 31 via the clamps 32. During installation, the height of the TDLAS gas remote sensing laser 2 is adjusted by adjusting the height of the clamps 32 against the first columns 31. Multiple clamps 32 are separately positioned on different sides of the TDLAS gas remote sensing laser 2 to ensure that the TDLAS gas remote sensing laser 2 remains balanced.

[0030] According to one embodiment of the present application, the first height adjustment device 3 includes three first columns 31. Three clamps 32 that cooperate with the first columns 31 are provided on the side walls of the TDLAS gas remote sensing laser 2. Two of the three clamps 32 are respectively provided on the two side walls of the TDLAS gas remote sensing laser 2 near the end of the reflector 1, and the remaining one is provided on the side wall of the TDLAS gas remote sensing laser 2 away from the reflector 1.

[0031] According to one embodiment of the present application, the clamp 32 includes two semicircular clamp bodies, and the first column 31 is arranged between the two clamp bodies; one end of the two clamp bodies is fixedly connected to the side wall of the TDLAS gas remote sensing laser 2 through a fixing plate; the other end of the two clamp bodies is provided with a connecting ear, and the connecting ears of the two clamp bodies are fixedly connected by a locking member (such as a bolt and a nut).

[0032] According to one embodiment of the present application, the clamp 32 is integrally formed with the fixing plate, and the fixing plate is fixedly connected to the side wall of the TDLAS gas remote sensing laser 2 by fasteners (such as screws or bolts).

[0033] According to one embodiment of the present application, Figure 3 and Figure 5 As shown, the second height adjustment device 3 includes a second column 8, a second base 81, and a screw 82. The top of the second base 81 is provided with a downwardly recessed mounting slot, into which the bottom end of the second column 8 extends and can slide longitudinally. One end of the screw 82 extends through the slot wall into the slot, abutting against the second column 8. The other end of the screw 82 is fixedly mounted with a knob. After adjusting the height of the second column 8, tightening the screw 82 with the knob applies pressure to the screw 82, securing it and preventing it from sliding up and down.

[0034] According to one embodiment of the present application, the angle adjustment device includes an L-shaped bracket 7 and an adjustment bolt; the L-shaped bracket 7 is fixedly mounted on the top of the second height adjustment device 3, and a threaded through hole 71 is installed at each end of the L-shaped bracket 7; Figure 4 As shown, the reflector 1 is mounted on a frame 6, which has two threaded countersunk holes 61 that mate with threaded through-holes 71. An adjusting bolt passes through the threaded through-holes 71 and then extends into the threaded countersunk holes 61. During use, the angle of the frame 6 is adjusted by screwing the two adjusting bolts at both ends of the L-shaped bracket 7, thereby achieving the angle adjustment operation of the reflector 1.

[0035] According to an embodiment of the present application, the two threaded countersunk holes 61 are arranged on an extension line of the same diameter of the reflector 1 , which can facilitate adjustment of the angle of the reflector 1 and improve the stability of the reflector 1 .

[0036] According to one embodiment of the present application, a number of reset springs arranged at intervals are connected between the mirror frame 6 and the L-shaped bracket 7. By providing the reset springs, it can be ensured that when the adjusting bolt is screwed and moved toward the end away from the reflector 1, the reflector 1 can automatically reset itself close to the L-shaped bracket 7 under the reset action of the spring without the need for external force.

[0037] According to one embodiment of the present application, a first spring mounting hole 62 is provided on a side of the mirror frame 6 facing the L-shaped bracket 7; a second spring mounting hole 72 is provided on a side of the L-shaped bracket 7 facing the mirror frame 6, the first spring mounting hole 62 and the second spring mounting hole 72 are opposite to each other, and the two ends of the spring are respectively installed in the first spring mounting hole 62 and the second spring mounting hole 72.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A TDLAS greenhouse gas monitoring instrument, characterized in that: It includes a TDLAS gas remote sensing laser, a laser mounting base, a reflector and a reflector mounting base; the TDLAS gas remote sensing laser includes a laser emitting unit and a laser detection unit, and the laser outlet of the laser emitting unit and the laser detection port of the laser detection unit are arranged on the same side of the TDLAS gas remote sensing laser; the reflector is arranged on the outgoing / incoming light path of the TDLAS gas remote sensing laser; the laser mounting base includes a first height adjustment device, and the TDLAS gas remote sensing laser is mounted on the first height adjustment device; the reflector mounting base includes a second height adjustment device and an angle adjustment device mounted on the top of the second height adjustment device, and the reflector is mounted on the angle adjustment device.

2. The TDLAS greenhouse gas monitoring instrument according to claim 1, characterized in that: The first height adjustment device includes at least three first columns. At least three clamps matching the first columns are provided on the side wall of the TDLAS gas remote sensing laser. The TDLAS gas remote sensing laser clamps the first columns through the clamps.

3. The TDLAS greenhouse gas monitoring instrument according to claim 2, characterized in that: The first height adjustment device includes three first columns, and three hoops matched with the first columns are provided on the side wall of the TDLAS gas remote sensing laser.

4. The TDLAS greenhouse gas monitoring instrument according to claim 3, characterized in that: The hoop includes two semicircular hoop bodies, one end of the two hoop bodies is fixedly connected to the side wall of the TDLAS gas remote sensing laser through a fixing plate; the other end of the two hoop bodies is provided with a connecting ear, and the connecting ears of the two hoop bodies are fixedly connected by a locking piece.

5. The TDLAS greenhouse gas monitoring instrument according to claim 4, characterized in that: The clamp is integrally formed with the fixing plate, and the fixing plate is fixedly connected to the side wall of the TDLAS gas remote sensing laser via a fastener.

6. The TDLAS greenhouse gas monitoring instrument according to claim 1, characterized in that: The second height adjustment device includes a second column, a second base and a screw; the top of the second base is provided with a downwardly recessed mounting groove, the bottom end of the second column extends into the mounting groove and can slide longitudinally along the mounting groove; one end of the screw passes through the groove wall of the mounting groove and extends into the mounting groove to abut against the column, and the other end of the screw is fixed with a knob.

7. The TDLAS greenhouse gas monitoring instrument according to claim 1 or 6, characterized in that: The angle adjustment device includes an L-shaped bracket and an adjusting bolt; the L-shaped bracket is fixedly installed on the top of the second height adjustment device, and a threaded through hole is installed at each end of the L-shaped bracket; the reflector is installed on the mirror frame, and the mirror frame is provided with two threaded countersunk holes that match the threaded through holes; the adjusting bolt passes through the threaded through hole and extends into the threaded countersunk hole.

8. The TDLAS greenhouse gas monitoring instrument according to claim 7, characterized in that: The two threaded countersunk holes are arranged on an extension line of the same diameter of the reflector.

9. The TDLAS greenhouse gas monitoring instrument according to claim 7, characterized in that: A plurality of reset springs arranged at intervals are connected between the mirror frame and the L-shaped bracket.

10. The TDLAS greenhouse gas monitoring instrument according to claim 9, characterized in that: A first spring mounting hole is provided on the side of the mirror frame facing the L-shaped bracket; a second spring mounting hole is provided on the side of the L-shaped bracket facing the mirror frame, the first spring mounting hole and the second spring mounting hole are opposite to each other, and the two ends of the spring are respectively installed in the first spring mounting hole and the second spring mounting hole.

Images