CN-224216548-U - Low-cavity-mode gas absorption tank for closed-cavity flux greenhouse gas monitoring

Abstract

The utility model relates to the technical field of greenhouse gas detection, in particular to a low-cavity-mode gas absorption tank for closed-cavity flux greenhouse gas monitoring, which comprises a laser, a base, a strip-shaped reflector a and a strip-shaped reflector b, wherein the laser is used for emitting laser beams, the upper end of the base is fixedly connected with a convex plate, and the strip-shaped reflector a and the strip-shaped reflector b are respectively arranged at two ends of the base. The utility model realizes a low-cavity mode and long-optical path gas absorption cell by adopting an ultrathin strip-shaped reflector, realizes the measurement of optical path exceeding 5m under a small volume, has the cavity die volume of less than 15mL, the gas replacement time of less than 1s, adopts an upper-lower structure, has fewer parts, low cost and convenient debugging and maintenance, and has the advantages of rapid gas replacement and optimized optical path design, so that a laser beam can interact with newly entered gas more rapidly, a detector can detect the change of gas concentration more timely, the flux monitoring precision is improved, and the greenhouse gas flux data can be acquired more accurately.

Inventors

• MA WENBIN
• LU XINGJIE

Assignees

• 安徽新谱光电科技有限公司

Dates

Publication Date

20260508

Application Date

20250509

Claims (6)

1. 1. A low cavity mode gas absorption cell for closed cavity flux greenhouse gas monitoring, comprising a laser for emitting a laser beam, characterized by further comprising: the device comprises a base (1), wherein the upper end of the base (1) is fixedly connected with a convex plate (11); the strip-shaped reflector a (3) and the strip-shaped reflector b (4), wherein the strip-shaped reflector a (3) and the strip-shaped reflector b (4) are respectively arranged at two ends of the base (1); The upper cover (2) is fixed on the base (1) through screws, the base (1), the upper cover (2), the strip-shaped reflecting mirror a (3) and the strip-shaped reflecting mirror b (4) jointly enclose a cavity mold (6), and the cavity mold (6) is a closed cavity; the strip-shaped reflector a (3) and the strip-shaped reflector b (4) are respectively provided with a light beam inlet and outlet hole (5), and the light beam inlet and outlet holes (5) are used for a laser beam to enter and exit the cavity die (6).
2. 2. The closed cavity flux greenhouse gas monitoring low cavity mode gas absorbing cell of claim 1, wherein the strip mirror a (3) and the strip mirror b (4) are ultra-thin mirrors.
3. 3. The closed cell flux greenhouse gas monitored low cavity die gas absorbing tank of claim 1, wherein the cavity die (6) has a volume of 10-15 mL.
4. 4. The low-cavity die gas absorption cell for closed-cavity flux greenhouse gas monitoring according to claim 1, wherein a sealing gasket is arranged between the base (1) and the upper cover (2), and the sealing gasket is matched with the convex plate (11) to ensure the tightness of the cavity die (6).
5. 5. The closed cavity flux greenhouse gas monitoring low cavity die gas absorption cell according to claim 1, further comprising a gas inlet and a gas outlet communicated with the cavity die (6), wherein the gas inlet and the gas outlet are arranged on the base (1) and are used for realizing rapid exchange of gas in the cavity die (6) and external gas.
6. 6. The closed cell flux greenhouse gas monitoring low cavity mode gas absorbing cell of claim 1, wherein the laser beam is a laser beam of a specific wavelength that matches the absorption spectrum of the greenhouse gas to be monitored.

Description

Low-cavity-mode gas absorption tank for closed-cavity flux greenhouse gas monitoring Technical Field The utility model relates to the technical field of greenhouse gas detection, in particular to a low-cavity mode gas absorption tank for closed-cavity flux greenhouse gas monitoring. Background The gas absorption cell is a key component in a greenhouse gas closed cavity flux measurement system, and is mainly divided into a single-pass direct injection type, a multi-reflection type (White/Herriott Ce10-15 mL) and a ring cavity enhancement type (CRDS) according to an optical path structure. The single-pass direct-injection type absorption cell is mainly used for detecting high-concentration pollution sources and is not suitable for atmospheric measurement due to short optical path and low in sensitivity, the multi-reflection type absorption cell is used for achieving multiple reflections (usually 20-100 times) through two concave mirrors, the purpose of increasing the optical path is achieved, the single-pass direct-injection type absorption cell has the advantages of being simple in structure, low in cost and wide in application, the cavity enhancement type absorption cell has the highest equivalent optical path, can reach kilometer level, is high in sensitivity, and is mainly used for detecting high-precision low-concentration gas. However, the existing gas absorption tanks for closed-cavity flux greenhouse gas monitoring are mainly based on the principle of multiple reflection, the traditional reflection absorption tanks are mainly divided into White type and Herriott type, and the problems of large cavity mode, low gas replacement speed and the like exist in the conventional reflection absorption tanks, and the response speed and three-dimensional wind field detection have 5-12 s hysteresis, so that the flux monitoring precision is seriously affected. Disclosure of utility model Aiming at the defects existing in the prior art, the utility model provides the low cavity mode gas absorption tank for closed cavity flux greenhouse gas monitoring, which can effectively solve the problems of large cavity mode and low gas replacement speed existing in the prior art. In order to achieve the above purpose, the utility model is realized by the following technical scheme: The utility model provides a low-cavity mode gas absorption cell for closed-cavity flux greenhouse gas monitoring, which comprises a laser, a laser device and a control device, wherein the laser device is used for emitting laser beams, and the control device further comprises: the upper end of the base is fixedly connected with a convex plate; the strip-shaped reflecting mirror a and the strip-shaped reflecting mirror b are respectively arranged at two ends of the base; the upper cover is fixed on the base through a screw, the base, the upper cover, the strip-shaped reflecting mirror a and the strip-shaped reflecting mirror b jointly enclose a cavity die, and the cavity die is a closed cavity; The strip-shaped reflector a and the strip-shaped reflector b are respectively provided with a light beam inlet and outlet hole, and the light beam inlet and outlet holes are used for the laser beam to enter and exit the cavity die. According to the low-cavity mode gas absorption cell for closed-cavity flux greenhouse gas monitoring, the strip-shaped reflector a and the strip-shaped reflector b are ultrathin reflectors. The low cavity mode gas absorption cell for closed cavity flux greenhouse gas monitoring is characterized in that the cavity mode has a volume of 10-15 mL. According to the low-cavity die gas absorption tank for closed-cavity flux greenhouse gas monitoring, the sealing gasket is arranged between the base and the upper cover, and the sealing gasket is matched with the convex plate to ensure the tightness of the cavity die. The low-cavity die gas absorption tank for closed-cavity flux greenhouse gas monitoring further comprises a gas inlet and a gas outlet which are communicated with the cavity die, wherein the gas inlet and the gas outlet are arranged on the base and are used for realizing rapid exchange of gas in the cavity die and external gas. According to the low-cavity-mode gas absorption cell for closed-cavity flux greenhouse gas monitoring, the laser beam is a laser beam with a specific wavelength, and the wavelength of the laser beam is matched with the absorption spectrum of the greenhouse gas to be monitored. Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects: 1. The utility model realizes the low-cavity mode and long-optical path gas absorption cell by adopting the ultrathin strip-shaped reflecting mirror, realizes the measurement of optical path exceeding 5m under small volume, has cavity die volume smaller than 15mL and gas replacement time smaller than 1s, and has the advantages of fewer parts, low cost and convenient debugging and maintenance by adopting an up-down s