CN108303376A - The multi-chamber series connection gas sample cell of built-in reflective mirror - Google Patents

Abstract

The invention belongs to atmospheric environment field of measuring technique, the multi-chamber series connection gas sample cell of specially a kind of built-in reflective mirror.The sample cell of the present invention includes sample tank main body, quartzy speculum；Sample tank main body includes concatenated first sample cell and at least one second sample cell, is separated by quartz window among two kinds of sample cells；Quartzy speculum is placed in the first sample cell, and quartz window, the second sample cell front end have quartz window to speculum towards the middle.First sample cell and the second sample cell are used in series and are passed through sample gas, to reach the target for realizing multiple equivalent concentrations using single concentration gases；Light reflects in sample cell after quartzy speculum is built in sample cell, simplifies optical path adjusting.This gas sample cell overcomes the shortcomings that a kind of concentration samples gas of existing sample cell can only demarcate an equivalent concentration, improves the service efficiency and working efficiency of sample gas, reduces the error during Demarcate Gas, easy to operate, be easy to make.

Description

Multi-chamber serial gas sample cell with built-in mirror

technical field

The invention belongs to the technical field of atmospheric environment measurement, and in particular relates to a multi-chamber serial gas sample pool with built-in reflectors for calibrating the standard of atmospheric environment monitoring instruments.

Background technique

For atmospheric environment monitoring instruments that use spectral analysis technology to measure pollutants, the measuring beam needs to be emitted during work. to hundreds of meters) and reflect back to the instrument, and by analyzing the reflected spectrum, the concentration of atmospheric pollutants in the area where the beam passes can be calculated. After this type of instrument has been working for a period of time, it is necessary to calibrate the instrument with a standard sample gas of known concentration. When calibrating the instrument, a sample cell of a certain length is inserted in the measurement optical path, the measuring beam is injected into the sample cell from one end of the sample cell, and after passing through the standard sample gas of the sample cell, it is emitted from the other end, reflected by the reflector and passed through again. After passing through the sample cell and standard sample gas, it enters the instrument measurement system for concentration calculation and calibration.

When the instrument is calibrated with a standard sample gas of a single known concentration, the sample cell of a certain length can only correspond to one equivalent concentration. In order to improve the measurement accuracy of the instrument, it is necessary to calibrate the instrument with multiple equivalent concentrations. In order to achieve multiple For an equivalent concentration, it is necessary to replace the sample cells with different lengths in the optical path, or use the same sample cell to replace the standard sample gas with different concentrations, whether the length of the sample cell is changed with the same gas concentration, or the gas is replaced with the same sample cell. Concentration, will increase the workload and operation and maintenance costs when calibrating the instrument.

In order to improve the calibration accuracy, when calibrating the instrument, it is necessary to place the reflector as close as possible to the front of the instrument, and the sample cell is placed between the instrument and the reflector to achieve the so-called "zero light path", which requires the remote reflector to be removed Put it in front of the instrument, or use another reflector to place it in front of the instrument. This method increases the workload of the operation and maintenance of the instrument, and at the same time brings difficulties to the adjustment of the optical path of the instrument.

Contents of the invention

In view of the above-mentioned defects existing in the use of the existing gas sample cell, the purpose of the present invention is to provide a device that is easy to use, does not need to re-adjust the optical path, and uses a single standard concentration sample gas to achieve multi-point equivalent concentration calibration of the measuring instrument. Gas sample cell.

The multi-chamber series gas sample cell with a built-in reflector and a set of sample cells and reflectors provided by the present invention includes: a sample cell body and a quartz reflector; the sample cell body includes a first sample cell connected in series and at least one The second sample cell is separated by a quartz window in the middle of the two sample cells; the sample cell with two chambers connected in series is used as an example to illustrate.

There is a built-in quartz reflector in the first sample cell, the reflector faces the quartz window, and the diameter of the reflector is equal to the inner diameter of the sample cell. There is an air inlet hole on one side of the first sample cell, and an air outlet hole on the corresponding other side.

The front end of the second sample pool has a quartz window. There is an air outlet on one side of the second sample cell, and an air inlet on the corresponding other side.

The main body of the sample cell (namely the first sample cell and the second sample cell) is fixed by the front window flange, the middle connecting flange and the rear flange.

In the present invention, the air outlet hole of the first sample cell is connected with the second air inlet hole of the second sample cell through a hose, so that the first sample cell and the second sample cell can be used in series.

In the present invention, the inner and outer diameters of the first sample pool and the second sample pool are the same. The distance between the quartz mirror in the first sample cell and the middle quartz window is 2-5cm.

In the present invention, the outer diameter of the intermediate quartz window between the first sample cell and the second sample cell is the same as that of the first sample cell.

In the present invention, the outer diameter of the quartz window at the front end of the second sample pool is the same as the outer diameter of the second sample pool.

In the present invention, when there are multiple second sample cells in the sample cell body, they are connected in series, and have the same structure and composition (such as the same inner and outer diameters), and their lengths can vary.

Compared with the existing gas sample cells, the present invention can be used in different combinations of the sample cells in the series sample cell, only need to pass through a single concentration of gas, that is to achieve multiple equivalent concentrations, due to the built-in quartz mirror, in multiple During the calibration of an equivalent gas concentration, there is no need to move the light source or the sample cell, so there is no need to adjust the optical path again, which has the characteristics of simplifying the operation and reducing the analysis error.

Description of drawings

Fig. 1 is a schematic diagram of the system structure of the device of the present invention.

Numbers in the figure: 01 is the first sample cell, 02 is the second sample cell, 03 is the quartz mirror, 04 is the first air inlet, 05 is the first air outlet, 06 is the second air inlet, 07 is the second Air outlet, 08 is the middle quartz window, 09 is the front quartz window, 10 is the rear flange, 11 is the middle connection flange, 12 is the front window flange, and 13 is the base plate.

Detailed ways

Refer to Figure 1. This is a multi-chamber serial gas sample cell device with a built-in new mirror, including: the first sample cell 01, the second sample cell 02, the quartz mirror 03, the first air inlet 04, and the first air outlet 05. The second air inlet 06, the second air outlet 07, the middle quartz window 08, the front quartz window 09, the rear flange 10, the middle connecting flange 11, and the front window flange 12.

The length of the second sample cell 02 is 9 cm.

The air outlet 05 of the first sample cell 01 and the air inlet 06 of the second sample cell 02 are connected by a hose, so that the first sample cell and the second sample cell can be used in series.

The inner and outer diameters of the first sample pool 01 and the second sample pool 02 are the same. The distance between the quartz mirror 03 in the first sample cell and the middle quartz window 08 is 3 cm.

The outer diameter of the middle quartz window 08 between the first sample cell 01 and the second sample cell 02 is the same as that of the first sample cell.

The outer diameter of the quartz window 09 at the front end of the second sample cell is the same as that of the second sample cell 02 .

When the gas sample cell is in use, the measuring beam can be injected into the sample cell through the front window flange, after passing through the second sample cell, the middle quartz window and the first sample cell, it is reflected by the quartz reflector, and is reflected along the injection path After returning, enter the instrument measurement system.

After the optical path is adjusted and the sample cell is stabilized, the sample gas of standard concentration is passed into the first sample cell through the first gas inlet hole, and high-purity air, nitrogen or other gases that do not affect the calibration of the gas to be measured are passed through the second inlet. The air hole leads into the second sample cell, which can realize the first equivalent concentration to calibrate the instrument; when the sample gas with standard concentration is passed into the second sample cell through the second air inlet hole, high-purity air, nitrogen or other gas that does not affect the The gas to be tested is calibrated into the first sample cell through the first air inlet, and the second equivalent concentration can be achieved to calibrate the instrument; the first air outlet and the second air inlet are connected with a hose, and the standard concentration The sample gas is passed into the first sample cell, the standard concentration sample gas entering the first sample cell, after passing through the first air outlet and the second air inlet, enters the second sample cell again, and is discharged from the sample cell through the second air outlet , to realize the series work of the first sample cell and the second sample cell, and realize the third equivalent concentration to calibrate the instrument. After each calibration, high-purity air should be continuously injected into the sample cell that has been injected with sample gas for several minutes for cleaning.

The above is only a specific implementation case of the present invention, and this case is described by connecting two chambers in series. However, the technical feature of the present invention can connect a plurality of sample cell chambers of different lengths with the same structure as the second sample cell in series at the front end of the front quartz window, so as to achieve the purpose of increasing the number of equivalent concentrations. Therefore, any changes or modifications made by those skilled in the art when using the present invention are covered by the patent scope of the present invention.

Claims (6)

1. The gas sample cell 1. a kind of multi-chamber of built-in reflective mirror is connected, which is characterized in that including：Sample tank main body, quartz are anti- Penetrate mirror；The sample tank main body includes concatenated first sample cell and at least one second sample cell, among two kinds of sample cells by Quartz window separates；

   The quartzy speculum is placed in the first sample cell, speculum towards quartz window, mirror diameter with it is straight in sample cell Diameter is equal；In the side of the first sample cell, there are one blowholes, and in the corresponding other side, there are one ventholes；

   The second sample cell front end has quartz window；In the side of the second sample cell, there are one ventholes, corresponding another There are one blowholes for side；

   The sample tank main body is fixed by front window flange, intermediate connecting flange and rear flange.
2. The gas sample cell 2. multi-chamber of built-in reflective mirror according to claim 1 is connected, which is characterized in that the first sample Second blowhole of the venthole in pond and the second sample cell is connected by hose, realizes the string of the first sample cell and the second sample cell Connection uses.
3. The gas sample cell 3. multi-chamber of built-in reflective mirror according to claim 1 is connected, which is characterized in that described the A sample pond is identical as the internal-and external diameter of the second sample cell, and the quartzy speculum in the first sample cell is at a distance from middle quartz window 2-4cm。
4. The gas sample cell 4. multi-chamber of built-in reflective mirror according to claim 1 is connected, which is characterized in that the first sample The outer diameter of middle quartz window between pond and the second sample cell is identical as the outer diameter of the first sample cell.
5. The gas sample cell 5. multi-chamber of built-in reflective mirror according to claim 1 is connected, which is characterized in that the second sample The outer diameter of the quartz window of pond front end is identical as the outer diameter of the second sample cell.
6. The gas sample cell 6. multi-chamber of the built-in reflective mirror according to one of claim 1-5 is connected, which is characterized in that institute When the second sample cell in the sample tank main body stated is multiple, to be serially connected, structure composition is identical.