Gas detection structure and method based on thermophoresis effect

Abstract

The invention relates to the technical field of gas detection, in particular to a gas detection structure and method based on the thermophoresis effect, and the structure comprises a thermophoresis adsorption unit and an intelligent control system; wherein the thermophoresis adsorption unit comprises a sample inlet, an enrichment pipe, a gas outlet valve, a heating element, a temperature sensor, an SAW resonator and a gas cavity; the intelligent control system comprises a microprocessor, a signal processing board and a connector; by accurately controlling the temperature gradient, efficient capture of gas molecules to be detected is realized, and the detection accuracy is improved; and an intelligent control system is introduced, so that the detection process is automatic and intelligent, manual intervention and operation steps are reduced, and the detection efficiency is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection, and in particular to a gas detection structure and method based on thermophoresis effect. Background Art

[0002] Gas detection technology is widely used in various fields, but traditional detection methods such as infrared detection, spectral analysis, mass spectrometry, etc. have problems such as high cost, complex maintenance, and slow response speed.

[0003] As a physical phenomenon, the thermophoresis effect provides a new way for gas detection by inducing the movement of gas molecules using temperature gradient. Most of the existing gas detection devices based on the thermophoresis effect have complex structures, cumbersome operations, and the detection efficiency and accuracy need to be improved. Summary of the invention

[0004] In view of this, the present invention proposes a gas detection structure and method based on thermophoresis effect to solve the above problems.

[0005] To achieve the above-mentioned purpose, the present invention provides a gas detection structure based on thermophoresis effect, comprising: a thermophoresis adsorption unit and an intelligent control system.

[0006] Furthermore, the thermophoretic adsorption unit includes: an inlet, an enrichment tube, an outlet valve, a heating element, a temperature sensor, a SAW resonator, and an air cavity; the intelligent control system includes: a microprocessor, a signal processing board, and a connector.

[0007] Furthermore, the microprocessor is connected to the signal processing board, the heating element, and the temperature sensor through the connector; the signal processing board is connected to the SAW resonator; the SAW resonator and the temperature sensor are both arranged on the same surface of the heating element, and the temperature sensor is used to monitor the surface temperature of the SAW resonator; the inlet and the outlet valve are respectively arranged at both ends of the enrichment tube, wherein the outlet valve and the SAW resonator, the temperature sensor, and the heating element form an air cavity.

[0008] The present invention also provides a gas detection method based on the thermophoresis effect, which adopts the above-mentioned gas detection structure based on the thermophoresis effect, and comprises the steps of:

[0009] S1. Preheat the sample inlet, gas outlet valve and heating element;

[0010] S2, introducing the gas to be tested into the thermophoresis adsorption unit;

[0011] S3, the intelligent control system obtains the parameters of the temperature sensor and adjusts the heating element according to the parameters, obtains the data of the SAW resonator and calculates the concentration of the gas to be measured according to the data, and outputs the calculation result;

[0012] S4. Raise the temperature of the heating element to remove impurities on the surface of the SAW resonator.

[0013] The beneficial effects of the present invention include: by precisely controlling the temperature gradient, efficient capture of the gas molecules to be detected is achieved, thereby improving the accuracy of detection; by introducing an intelligent control system, the detection process is automated and intelligent, manual intervention and operation steps are reduced, and the detection efficiency is effectively improved; by controlling the relative position and distance between the outlet valve and the resonator and simultaneously adopting a three-dimensional stacking structure, the occupied area of ​​the temperature sensor, the heating element, and the resonator is reduced, and the cost of gas detection is reduced, making the technology suitable for organic gas monitoring, gas concentration measurement, and gas type analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a preferred embodiment;

[0015] Figure 2 It is a schematic diagram of an enlarged structure of a preferred embodiment;

[0016] Figure 3 is a schematic diagram of an adsorption unit in a preferred embodiment;

[0017] Figure 4 A flowchart of an intelligent control system in a preferred embodiment;

[0018] Among them, the numbers 1 are the outlet valve, 2 are the enrichment tube, 3 are the sample inlet, 4 are the heating element, 5 are the temperature sensor, 6 are the SAW resonator, 7 are the signal processing board, 8 are the connector, and 9 are the air cavity. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution, characteristics and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0020] A preferred embodiment of the present invention has a structure as follows Figure 1 As shown, the schematic diagram after enlarging part of its structure is as follows Figure 2 shown.

[0021] Specifically, this embodiment includes: a thermophoresis adsorption unit, an intelligent control system;

[0022] Furthermore, the thermophoretic adsorption unit includes: an inlet, an enrichment tube, an outlet valve, a heating element, a temperature sensor, a SAW resonator, and an air cavity, wherein the enrichment tube is L-shaped, which can efficiently remove impurities and filter out the gas to be tested; the thermophoretic adsorption unit is used to adsorb the gas molecules of the gas to be tested on the surface of the SAW resonator.

[0023] Furthermore, the intelligent control system includes: a microprocessor, a signal processing board, and a connector; which are used to automatically control the thermophoresis adsorption unit, obtain the signal of the SAW resonator and calculate the concentration of the gas to be measured based on the signal.

[0024] The connection method is as follows: the microprocessor is connected to the signal processing board, the heating element, and the temperature sensor through the connector; the signal processing board is connected to the SAW resonator; the SAW resonator and the temperature sensor are both arranged on the same surface of the heating element, and the temperature sensor is used to monitor the surface temperature of the SAW resonator; the inlet and the outlet valve are respectively arranged at both ends of the enrichment tube, wherein the outlet valve and the SAW resonator, the temperature sensor, and the heating element form an air cavity.

[0025] Among them, the inlet is used to heat and filter the gas to be tested; the enrichment tube is used to enrich the gas to be tested; the outlet valve is used to secondary heat the gas to be tested so that the temperature of the gas to be tested and the gas temperature in the gas cavity form a temperature gradient; the gas cavity is used to gather the gas to be tested; and the heating element is used to control the surface temperature of the SAW resonator.

[0026] The present invention also includes a gas detection method based on the thermophoresis effect, comprising the steps of:

[0027] S1. Preheat the inlet, outlet valve and heating element.

[0028] Specifically, the preheating temperatures of the sample inlet, the gas outlet valve and the heating element are set to 200°C, 200°C and 10°C respectively; the temperature sensor feeds back the real-time temperature to the intelligent control system, and the intelligent control system determines whether the real-time temperature reaches the preheating temperature; the preheating process ends when the temperatures of the resonator, the gas outlet valve and the sample inlet all reach the preheating temperature.

[0029] S2. Introduce the gas to be tested into the thermophoresis adsorption unit.

[0030] Specifically, the gas to be tested is heated through the injection port to remove impurities, and the heating temperature is set to 200°C to retain the pure gas to be tested and enter the enrichment tube; the pure gas to be tested is enriched in the enrichment tube for 5 seconds to complete the enrichment; the gas is secondary heated through the outlet valve, and the high-temperature gas is pushed out after the heating is completed; the outlet valve is a frustum-shaped valve, which is used to increase the efficiency of the SAW resonator in capturing the gas molecules of the gas to be tested.

[0031] S3. The intelligent control system obtains the parameters of the temperature sensor and adjusts the heating element according to the parameters, obtains the data of the SAW resonator and calculates the concentration of the gas to be measured according to the data, and outputs the calculation result.

[0032] Specifically, at this time, under the action of the heating element, the surface temperature of the SAW resonator is much lower than the temperature of the gas to be measured, and the current temperature is maintained under real-time monitoring by the temperature sensor; under the thermophoresis effect, the gas to be measured is instantly cooled and adsorbed on the surface of the resonator when it contacts the resonator, where the size of the resonator is 4mm*4mm; after stabilization, the resonator transmits the signal to the signal processing board, and the microprocessor performs calculation and analysis on the signal mixing, calculates the concentration of the gas to be measured and outputs the calculation result.

[0033] Among them, signal transmission is achieved by the connector, and signal processing is achieved by the signal processing board.

[0034] S4. Raise the temperature of the heating element to remove impurities on the surface of the SAW resonator.

[0035] Specifically, the heating element is regulated so that the temperature sensor detects that the temperature of the SAW resonator rises to 180° C., and waits for the next test.

[0036] Finally, it should be noted that the above only describes some embodiments of the present invention. For those skilled in the art, it is conceivable that various changes, modifications, substitutions and deformations may be made to these embodiments without departing from the principles and spirit of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents, and the above-mentioned actions should be covered within the scope of protection of the present invention.

Claims

1. A gas detection structure based on thermophoresis effect, characterized in that: include: Thermophoretic adsorption unit, intelligent control system; The thermophoretic adsorption unit includes: an inlet, an enrichment tube, an outlet valve, a heating element, a temperature sensor, a SAW resonator, and an air cavity; the intelligent control system includes: a microprocessor, a signal processing board, and a connector; The connection method is as follows: the microprocessor is connected to the signal processing board, the heating element, and the temperature sensor through the connector; the signal processing board is connected to the SAW resonator; the SAW resonator and the temperature sensor are both arranged on the same surface of the heating element, and the temperature sensor is used to monitor the surface temperature of the SAW resonator; the inlet and the outlet valve are respectively arranged at both ends of the enrichment tube, wherein the outlet valve and the SAW resonator, the temperature sensor, and the heating element form an air cavity.

2. The gas detection structure based on thermophoresis effect according to claim 1, characterized in that: The thermophoresis adsorption unit is used to capture the gas to be measured, so that the gas molecules of the gas to be measured are adsorbed on the surface of the SAW resonator.

3. The gas detection structure based on thermophoresis effect according to claim 2, characterized in that: The sample inlet and the gas outlet valve in the thermophoresis adsorption unit have a heating function; the gas outlet valve is a frustum-shaped valve, which is used to increase the efficiency of the SAW resonator in capturing gas molecules.

4. The gas detection structure based on thermophoresis effect according to claim 2, characterized in that: The size of the SAW resonator is 4mm*4mm.

5. The gas detection structure based on thermophoresis effect according to claim 2, characterized in that: The distance between the SAW resonator and the air hole of the air outlet valve ranges from 2 mm to 6 mm.

6. The gas detection structure based on thermophoresis effect according to claim 1, characterized in that: The intelligent control system is used to automatically control the thermophoresis adsorption unit, obtain the signal of the SAW resonator and calculate the concentration of the gas to be measured based on the signal.

7. A gas detection method based on thermophoresis effect, the method adopts the gas detection structure based on thermophoresis effect according to any one of claims 1 to 6, characterized in that: Includes steps: S1. Preheat the sample inlet, gas outlet valve and heating element; S2, introducing the gas to be tested into the thermophoresis adsorption unit; S3, the intelligent control system obtains the parameters of the temperature sensor and adjusts the heating element according to the parameters, obtains the data of the SAW resonator and calculates the concentration of the gas to be measured according to the data, and outputs the calculation result; S4. Raise the temperature of the heating element to remove impurities on the surface of the SAW resonator.

8. The gas detection method based on thermophoresis effect according to claim 9, characterized in that: At the end of the preheating process, the temperature of the heating element is 5°C to 50°C, and the temperature of the outlet valve and the inlet is the same, both higher than the heating element, and the temperature difference is greater than 150°C.

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