Device for measuring gas concentration in short optical path by taking long optical path as model

Abstract

The utility model discloses a short-optical-path gas concentration measuring device taking a long optical path as a model, a short-optical-path gas cell can be installed in a long-optical-path gas cell, after a gas concentration model is made under the long-optical-path gas cell, the long-optical-path gas cell can be continuously used for measuring the gas concentration matched with the long-optical-path gas cell, and the long-optical-path gas cell can be used for measuring the gas concentration matched with the long-optical-path gas cell. A short-optical-path gas cell can be switched to measure the high-concentration gas, so that the measurement range of the same equipment can be expanded; meanwhile, when a harmful gas model, such as flammable and explosive poisonous gas, is made, and the health and safety of operators are facilitated by using the low-concentration standard gas to make the model.

Description

Technical Field

[0001] The utility model relates to the technical field of gas detection, in particular to a device for measuring gas concentration using a long optical path as a model and a short optical path. Background Art

[0002] With the development of economy, the speed of human development and utilization of the earth has far exceeded the earth's renewable cycle, resulting in many environmental problems, the most serious of which is the air quality problem. Therefore, the development of instruments that can detect gas concentrations is of great significance to improving the living environment of mankind.

[0003] The optical method is a common gas concentration detection technology. Its principle is to use the propagation and absorption properties of light in the gas to measure the concentration. Usually, the measurement system has only one gas cell of fixed length. This gas cell is used as a gas concentration model. This model can only measure the gas concentration that matches this fixed-length gas cell. When the concentration exceeds the model range, the existing optical path may not be applicable, and the existing model is not applicable. If you need to measure gases of different concentrations, you need to replace the spectrometer with a different optical path, which results in a narrower range of application of the spectrometer. Utility Model Content

[0004] The utility model aims to provide a device for measuring gas concentration by using a long optical path as a model and a short optical path, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a device for measuring gas concentration by using a long optical path as a model and a short optical path, comprising a light emitting system, a collimating system running through the entire device, a long optical path gas pool, a focusing system connected to the outlet of the long optical path gas pool, and a photosensitive system connected to the focusing system. The gas concentration device also comprises a short optical path gas pool, the long optical path gas pool is provided with an installation groove, and the short optical path gas pool is detachably accommodated in the installation groove.

[0006] The light emitting system is arranged at the front end of the device for measuring gas concentration by using a long optical path as a model and a short optical path, and is used to provide the light source required by the measuring device;

[0007] The collimation system runs through the entire measuring device and is used to collimate the light generated by the light emitting system to make it a parallel light beam;

[0008] The long optical path gas cell is a special gas cell with a long optical path;

[0009] The short optical path gas cell is installed on the long optical path gas cell and is used to measure high concentration gas;

[0010] The focusing system is used to focus the parallel light beam passing through the gas pool onto the photosensitive system;

[0011] The photosensitive system is used for receiving focused light.

[0012] The long optical path gas cell has a slot for placing the short optical path gas cell, and the optical path of the short optical path gas cell overlaps a part of the optical path of the long optical path gas cell. When the short optical path gas cell is needed, the short optical path gas cell is placed in the long optical path gas cell slot, and the short optical path gas cell is ventilated (there is no gas to be measured in the long optical path gas cell, and there is gas to be measured in the short optical path gas cell); when the long optical path gas cell is needed, the short optical path gas cell is taken out, the long optical path gas cell is sealed, and then the long optical path gas cell is ventilated (at this time, the short optical path gas cell is not in the system, and there is gas to be measured in the long optical path gas cell). The long optical path and short optical path gas cells of this device each have their own independent air inlet and outlet, and the gas to be measured enters the gas cell through the air inlet and is discharged from the outlet. The gas concentration device also includes a cover for sealing the mounting slot. The light generated by the light-emitting system is converted into a parallel beam after passing through the collimation system, and then enters the photosensitive system for analysis after passing through the gas to be tested. The absorption spectrum is reduced compared to the original background spectrum, and the concentration of the gas is measured according to the Lambert-Beer absorption law.

[0013] According to the Lambert-Beer absorption law, when the absorbance is the same, the concentration of the gas being measured is inversely proportional to the optical path of the gas being measured. Under the same absorbance, a gas cell with a short optical path can pass a high concentration of gas.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The technology of the present invention detachably installs a short optical path gas cell in a long optical path gas cell. After making a gas concentration model under the long optical path gas cell, the long optical path gas cell can be used to continue to measure the gas concentration matching the long optical path gas cell, or the short optical path gas cell can be switched to measure high-concentration gas, thereby broadening the measurement range of the same spectrometer equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A short optical path gas concentration measuring device is used as a model for the long optical path of the utility model;

[0017] In the figure:

[0018] 1. Light emitting system 2. Collimation system 3. Long optical path gas pool 4. Short optical path gas pool 5. Focusing system 6. Photosensitive system DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] Embodiment 1: Figure 1 As shown, the utility model provides a technical solution: a device for measuring gas concentration using a long optical path as a model and a short optical path, comprising a light emitting system, a collimating system running through the entire device, a long optical path gas pool, a focusing system connected to the outlet of the long optical path gas pool, and a photosensitive system connected to the focusing system. The gas concentration device also includes a short optical path gas pool, the long optical path gas pool is provided with an installation groove, and the short optical path gas pool is detachably accommodated in the installation groove.

[0021] The light emitting system is arranged at the front end of the device for measuring gas concentration by using a long optical path as a model and a short optical path, and is used to provide the light source required by the measuring device;

[0022] The collimation system runs through the entire measuring device and is used to collimate the light generated by the light emitting system to make it a parallel light beam;

[0023] The long optical path gas cell is a special gas cell with a long optical path;

[0024] The short optical path gas cell is installed on the long optical path gas cell and is used to measure high concentration gas;

[0025] The focusing system is used to focus the parallel light beam passing through the gas pool onto the photosensitive system;

[0026] The photosensitive system is used for receiving focused light.

[0027] The long optical path gas cell has a slot for placing the short optical path gas cell, and the optical path of the short optical path gas cell overlaps part of the optical path of the long optical path gas cell. When the short optical path gas cell is needed, the short optical path gas cell is placed in the long optical path gas cell slot and the short optical path gas cell is ventilated. At this time, there is no gas to be measured in the long optical path gas cell, but there is gas to be measured in the short optical path gas cell; when the long optical path gas cell is needed, the short optical path gas cell is taken out, the long optical path gas cell is sealed, and the long optical path gas cell is ventilated again. At this time, the short optical path gas cell is not in the system, but there is gas to be measured in the long optical path gas cell. The long optical path and short optical path gas cells of this device each have their own independent air inlet and outlet. The gas to be measured enters the gas cell through the air inlet and is discharged from the outlet. The light generated by the light emitting system becomes a parallel light beam after passing through the collimation system, and enters the photosensitive system for analysis after passing through the gas to be measured. The absorption spectrum is reduced compared to the original background spectrum, and the concentration of the gas is measured according to the Lambert-Beer absorption law.

[0028] According to the Lambert-Beer absorption law, when the absorbance is the same, the concentration of the gas being measured is inversely proportional to the optical path of the gas being measured. Under the same absorbance, a gas cell with a short optical path can pass a high concentration of gas.

[0029] Embodiment 2:

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for measuring gas concentration by using a long optical path as a model for a short optical path, comprising a light emitting system (1), a collimating system (2) running through the entire device, a long optical path gas pool (3), a focusing system (5) connected to the outlet of the long optical path gas pool (3), and a photosensitive system (6) connected to the focusing system (5), characterized in that: The gas concentration device further comprises a short optical path gas cell (4), the long optical path gas cell (3) is provided with a mounting groove, and the short optical path gas cell (4) is detachably accommodated in the mounting groove.

2. The device for measuring gas concentration by using a long optical path as a model and a short optical path as a model according to claim 1, characterized in that: The long optical path gas pool (3) and the short optical path gas pool (4) each have their own independent gas inlet and outlet.

3. The device for measuring gas concentration by using a long optical path as a model and a short optical path as a model according to claim 1, characterized in that: The gas concentration device also includes a cover for sealing the mounting groove.

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