Method of simultaneously improving uniformity of air flow and temperature in ion mobility pipe

Abstract

The invention relates to a method of simultaneously improving uniformity of an air flow and temperature in an ion mobility spectrometry mobility zone. After drift air of the ion mobility spectrometryenters a mobility pipe, the air sequentially flows through one or more than one drift air passing hole in a circular metal plate whose temperature is almost the same as that in the mobility zone and enters the mobility zone, the drift air is subjected to diversion and preheating through one or more than one drift air passing hole in the metal plate, the distribution uniformity of the air flow andthe flow velocity in the mobility zone can be improved simultaneously, and the resolution is thus improved.

Description

technical field [0001] The invention relates to a method for improving the uniformity of gas flow and temperature in a simultaneous ion transfer tube. Specifically, after the room temperature drift gas with a certain flow rate is passed into the ion transfer tube, it passes through one or more drift gas holes on the heated circular metal plate in turn, and then enters the migration area in the ion transfer tube, so as to achieve the effect of drift gas. The role of shunting and preheating can improve the uniformity of gas flow and temperature distribution in the ion transfer tube, thereby improving the resolution of the transfer spectrum. Background technique [0002] The uniformity of gas flow and temperature distribution in the ion transfer tube, especially in the transfer region, are two important factors affecting the resolution of the transfer spectrum. Conventional ion transfer tubes directly pass drift gas at room temperature into the transfer region, which will form...

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Problems solved by technology

Reducing the flow velocity of the drift gas can reduce its influence on the temperature of the migration zone, and at the same time reduce the turbulence formed by the drift gas in the migration zone, but this method cannot completely solve the problem. In addition, when the drift gas velocity is too small , it is difficult to ensure the cleanliness of the migration area

The drift gas is heated to the same temperature as the transfer tube before entering the transfer tube, but this method requires additional heating and temperature control devices, which will increase the manufacturing cost and volume of the transfer spectrometer

The method to improve the uniformity of the airflow distribution in the migration area in the migration tube is generally to reduce the flow velocity of the drift gas to reduce its influence on the temperature of the migration area, but this method cannot completely solve the problem. In addition, when the drift gas velocity If the temperature is too small, it is difficult to ensure the cleanliness of the migration area

[0004] There is no literature report on the method of improving the uniformity of airflow distribution in the migration zone

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