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

Abstract

The invention belongs to the technical field of atmospheric environment measurement, and concretely relates to a multi-chamber serial connection gas sample cell with a built-in reflecting mirror. Thesample cell comprises a sample cell main body and the quartz reflecting mirror; the sample cell main body comprises a first sample cell and at least one second sample cell which are serially connected, and the two types of sample cells are separated by a quartz window; and the quartz reflecting mirror is placed in the first sample cell, the reflecting mirror faces the middle quartz window, and a quartz window is arranged at the front end of the at least one second sample cell. The first sample cell and the at least one second sample cell are serially uses an introduced sample gas in order to achieve multiple equivalent concentrations of a single concentration gas; and the quartz reflecting mirror is arranged in the sample cell to make lights reflected in the sample cell, so light path adjustment is simplified. The gas sample cell overcomes the shortcoming that existing sample cells only can calibrate one equivalent concentration of one concentration sample gas, improves the use efficiency and the working efficiency of the sample gas, reduces the error in the gas calibration process, is convenient to operate and is easy to manufacture.

Description

technical field [0001] 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 [0002] 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 ...

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Problems solved by technology

[0003] 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

[0004] 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 put 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.

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