A quartz crystal microbalance sensor for gas detection

Abstract

The application provides a quartz crystal microbalance sensor for gas detection, and belongs to the field of scientific detection instruments. It comprises a sensor shell and two quartz crystal piece assemblies. The sensor shell is a cube, and the shell is provided with a through gas channel and symmetrically arranged quartz crystal piece assembly mounting holes, which are axially perpendicular to the gas channel and are penetrable. The two quartz crystal piece assemblies have the same structure, one end of which is a plug-in end matched with the quartz crystal piece assembly mounting hole of the sensor shell, and a quartz crystal piece plug-in part is arranged at the plug-in end, and the other end is provided with an electromagnetic radiation shielding lead wire interface. The application makes the operation of installing and replacing the quartz crystal piece more convenient, and can avoid installation stress; makes the two measurement units in the same detection environment, so that they can be synchronously detected to eliminate system error and improve the measurement accuracy.

Description

TECHNICAL FIELD

[0001] The application is a quartz crystal microbalance sensor for gas detection, belonging to the field of scientific detection instruments. BACKGROUND

[0002] Quartz crystal microbalance is an analytical instrument capable of detecting small mass changes. With a specific quartz crystal oscillator as a transducer device, it constitutes a mass-frequency sensitive element with the sensitive material attached to it. The mass change caused by the interaction between the analyzed substance and the sensitive material leads to the change of the quartz crystal frequency in real time, and through the detection of the frequency change, the real-time quantitative detection and analysis of small mass are realized. It has a very broad application prospect in the fields of clinical testing, environmental testing, food safety testing, life science, new drug screening, material science, etc.

[0003] For the quartz crystal microbalance detection instrument of gas detection object, the core component is the sensor equipped with a quartz crystal piece. However, the existing quartz crystal sensor is complicated and delicate in operation for installing and replacing the quartz crystal piece, and the contact pressure is not easy to control. Often, the installation stress causes poor reproducibility of the measurement results and affects the measurement accuracy, and even causes damage to the quartz crystal piece.

[0004] When sampling gas, it is usually necessary to carry out comparative sampling to eliminate system error. The existing method is to use multiple sensors for parallel sampling. The disadvantage of this method is that each sensor is located in its own independent system, and the asynchronization and difference of time, physical and chemical variables between systems will cause errors in the detection results. SUMMARY

[0005] In view of the deficiencies of the prior art, the application provides a quartz crystal microbalance sensor for gas detection, which solves the technical problems as follows: first, the operation for installing and replacing the quartz crystal piece is more convenient, and installation stress can be avoided; second, the measurement and reference units are placed in the same detection environment, so that they can be detected synchronously to eliminate system error and improve the accuracy of measurement.

[0006] In order to achieve the above technical purpose, the present application adopts the following technical scheme: a quartz crystal microbalance sensor for gas detection, comprising a sensor shell and two quartz crystal piece assemblies installed in the sensor shell, the sensor shell is a cube or other geometric shape, the front and rear of the shell are provided with through gas channels, the upper and lower of the shell are respectively provided with quartz crystal piece assembly mounting holes which are axially perpendicular to the gas channels and are through; the two quartz crystal piece assemblies have the same structure, which are a detection unit assembly and a reference unit assembly respectively, one end of the two quartz crystal piece assemblies with the same structure is a plug-in end which is matched with the quartz crystal piece assembly mounting hole of the sensor shell, a quartz crystal piece plug-in is arranged at the plug-in end, the other end of the two quartz crystal piece assemblies with the same structure is provided with an electromagnetic radiation shielding lead interface.

[0007] The present application has the following beneficial effects: first, the direct installation operation of the small and fragile quartz crystal piece monomer is avoided, the quartz crystal piece assembly is installed, which not only makes the installation operation simple and fast, but also avoids the poor reproducibility of the measurement results and the influence on the measurement accuracy caused by the installation stress, and solves the damage of the quartz crystal piece caused by improper operation. Second, two quartz crystal pieces are arranged in parallel and symmetrically in the same gas channel, which are used as a detection unit and a reference unit respectively, so that the two measurement units are in the same detection environment, and the error of the detection result caused by the asynchronization and difference of time, physics, chemistry and other variables between the systems is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0008] Fig. 1 is the overall isometric view of the present application, Fig. 2 is the internal structure sectional view of the present application, Fig. 3 is the exploded view of each component of the present application. In the figure, 1. sensor shell, 2. detection unit assembly, 2-1 quartz crystal piece plug-in, 3. reference unit assembly, 3-1 quartz crystal piece plug-in, 4. electromagnetic radiation shielding lead interface, 5. gas channel, 6. quartz crystal piece assembly mounting hole. DETAILED DESCRIPTION

[0009] The present application will be further described below in combination with the drawings.

[0010] Example 1: as Figs. 1 to 3As shown, a quartz crystal microbalance sensor for gas detection includes a sensor housing and two quartz crystal piece assemblies, the sensor housing 1 is a cube, the front and rear of the sensor housing 1 are provided with through gas channels 5, the upper and lower of the sensor housing 1 are respectively provided with quartz crystal piece assembly mounting holes 6 which are axially perpendicular to the gas channels 5 and are penetrated; the two quartz crystal piece assemblies have the same structure, which are respectively a detection unit assembly 2 and a reference unit assembly 3, one end of the detection unit assembly 2 and the reference unit assembly 3 is a plug-in end which is matched with the quartz crystal piece assembly mounting hole 6 of the sensor housing 1, and the plug-in end is provided with a quartz crystal piece plug-in 2-1 and a quartz crystal piece plug-in 3-1, the other end of the detection unit assembly 2 and the reference unit assembly 3 is provided with an electromagnetic radiation shielding lead interface 4.

[0011] The installation operation steps of the quartz crystal microbalance sensor for gas detection are as follows: the quartz crystal piece plug-in 2-1 and the quartz crystal piece plug-in 3-1 are respectively installed in the detection unit assembly 2 and the reference unit assembly 3, the detection unit assembly 2 and the reference unit assembly 3 are fixed in the quartz crystal piece assembly mounting hole 6 of the sensor housing 1, the wire is connected with the electromagnetic radiation shielding lead interface 4, and the gas passes through the detection channel (5).

[0012] After the above installation and inspection, the sample can be introduced: the gas passes through the detection channel 5.

Claims

1. A quartz crystal microbalance sensor for gas detection comprising a sensor housing and two quartz crystal wafer assemblies, characterized in that, The sensor housing (1) is a cube, the front and back of the sensor housing (1) are provided with through gas channels (5), the upper and lower of the sensor housing (1) are respectively provided with quartz crystal piece assembly mounting holes (6) which are symmetrical, the quartz crystal piece assembly mounting holes (6) are perpendicular to the gas channels (5) and are through; the two quartz crystal piece assemblies have the same structure, which are respectively a detection unit assembly (2) and a reference unit assembly (3), one end of the detection unit assembly (2) and the reference unit assembly (3) is a plug-in end which is matched with the quartz crystal piece assembly mounting hole (6) of the sensor housing (1), and the plug-in end is respectively provided with a quartz crystal piece plug-in A (2-1) and a quartz crystal piece plug-in B (3-1), the other end of the detection unit assembly (2) and the reference unit assembly (3) is provided with an electromagnetic radiation shielding lead interface (4).

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