CN-121978273-A - Gas recognition device, gas recognition method and electronic nose system

CN121978273ACN 121978273 ACN121978273 ACN 121978273ACN-121978273-A

Abstract

The present disclosure relates to the field of gas detection technologies, and in particular, to a gas recognition device, a gas recognition method, and an electronic nose system, where the gas recognition device includes a constant temperature gas circuit unit, a sensor array, a calibration unit, and a data processing unit; the constant temperature gas circuit unit is used for receiving gas to be tested and providing a temperature-controllable test environment for the gas to be tested, the sensor array is used for acquiring information of the gas to be tested and converting the information into an electric signal, the calibration unit is connected with the data processing unit and used for generating a reference signal and transmitting the reference signal to the data processing unit to provide a calibration reference for the electric signal of the sensor array, the data processing unit is connected with the constant temperature gas circuit unit and also connected with the sensor array, and the data processing unit is used for controlling the formation and switching of the test environment and receiving the electric signal and identifying the information of the gas to be tested.

Inventors

SUN YUHAO
LIN YANZHEN
ZHANG YIHANG
ZHAO BOYANG
SUN KE
SHEN WENFENG

Assignees

中科微感(宁波)科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260113

Claims (10)

1. The gas identification device is characterized by comprising a constant-temperature gas circuit unit, a sensor array, a calibration unit and a data processing unit; The constant-temperature gas circuit unit is used for receiving gas to be tested and providing a temperature-controllable test environment for the gas to be tested; The sensor array is used for acquiring information of the gas to be detected and converting the information into an electric signal; The calibration unit is connected with the data processing unit and is used for generating a reference signal and transmitting the reference signal to the data processing unit to provide a calibration reference for the electric signals of the sensor array; the data processing unit is connected with the constant temperature gas circuit unit and the sensor array, and is used for controlling the formation and switching of the test environment, receiving the electric signals and identifying the information of the gas to be tested.
2. The gas identification device according to claim 1, wherein the constant temperature gas circuit unit comprises a test chamber and a buffer chamber which are communicated with each other; The test cavity is provided with a first exhaust valve, and the buffer cavity is provided with an air inlet valve for introducing the gas to be tested, an air exhaust valve for exhausting the gas to be tested and a second exhaust valve; The first exhaust valve is used for exhausting residual gas in the test cavity, and the second exhaust valve is used for exhausting residual gas in the buffer cavity; And a butterfly valve is arranged between the test cavity and the buffer cavity and used for controlling the opening or closing of a gas passage between the test cavity and the buffer cavity.
3. The gas identification device according to claim 2, wherein the constant temperature gas circuit unit further comprises a first flowmeter and a second flowmeter; The first flowmeter is arranged on a first air path, the first air path is communicated with the test cavity, and the first flowmeter is used for adjusting the flow of the cleaning gas entering the test cavity; the second flowmeter is arranged on a second gas path, the second gas path is communicated with the buffer cavity, and the second flowmeter is used for adjusting the flow of the cleaning gas entering the buffer cavity.
4. The gas identification device according to claim 3, wherein the constant temperature gas circuit unit further comprises a temperature sensor, a heating element and a temperature controller; The heating element is arranged in the test cavity and connected with the temperature controller, or the heating element is arranged on the outer wall of the test cavity and connected with the temperature controller; The temperature controller is used for receiving the temperature signal acquired by the temperature sensor, comparing whether the temperature signal is stable at a preset temperature, and if not, outputting a control signal to drive the heating element to work.
5. The gas identification device according to claim 2, further comprising a gas cleaning unit; the gas cleaning unit is communicated with the gas inlet of the constant-temperature gas circuit unit and is used for providing cleaning gas for the constant-temperature gas circuit unit; Before or after detection, the gas identification device is used for injecting cleaning gas into the test cavity and the buffer cavity for purging.
6. The gas identification device of claim 1 wherein the sensor array comprises a plurality of MEMS sensors having different gas sensitive materials.
7. A smell recognition method of a gas recognition apparatus, applied to a gas recognition apparatus according to any one of claims 1 to 6, comprising: Starting the gas identification device to heat the test cavity so that the temperature reaches and stabilizes at a preset temperature; Controlling a gas cleaning unit to respectively introduce cleaning gas into the test cavity and the buffer cavity, purging the test cavity and discharging waste gas; introducing the gas to be tested into the buffer cavity, opening a butterfly valve, diffusing the gas to be tested in the buffer cavity into the test cavity, and collecting the electric signals of the sensor array; processing the collected electric signals and outputting smell recognition results based on a smell recognition model; after the test is finished, the gas cleaning unit is controlled to respectively introduce cleaning gas into the test cavity and the buffer cavity for purging, and exhaust gas is discharged.
8. The odor identification method of claim 7 wherein, before said activating said gas identification means, heating said test chamber to a temperature and stabilize it at a predetermined temperature, or before said introducing said gas to be tested into said buffer chamber, opening a butterfly valve to diffuse said gas to be tested within said buffer chamber into said test chamber, and collecting electrical signals from said sensor array; and introducing standard gas into the test cavity, detecting the standard gas by the calibration unit, and calibrating the electric signals of the sensor array in real time to obtain calibration parameters.
9. The odor identification method of claim 7 wherein said control gas purge unit separately purging said test chamber and said buffer chamber with purge gas, and wherein exhausting exhaust gas comprises; And cleaning gas is respectively supplied to the test cavity and the buffer cavity through the first gas circuit and the second gas circuit which are connected in parallel, and the flow rate of the gas flowing into the test cavity and the buffer cavity is controlled through the first flowmeter and the second flowmeter.
10. An electronic nose system, comprising: A housing; A gas identification device within the housing, the gas identification device being as claimed in any one of claims 1 to 6.

Description

Gas recognition device, gas recognition method and electronic nose system Technical Field The disclosure relates to the technical field of gas detection, in particular to a gas identification device, a gas identification method and an electronic nose system. Background With the rapid development of the fields of the Internet of things, intelligent detection, health monitoring and the like, the odor identification technology has an important application prospect in the aspects of food freshness evaluation, medical noninvasive diagnosis, environmental pollutant monitoring, industrial process control and the like. The traditional smell identification relies on manual sensory evaluation or a large-scale analysis instrument, and has the problems of strong subjectivity, complex operation, difficult real-time online detection and the like. The gas sensor array technology is one of the main current means for realizing odor identification, and the identification and classification of complex odor components are realized by combining a pattern identification algorithm through a plurality of gas sensor arrays with cross sensitivity. The sensor array widely used at present is mainly based on traditional gas-sensitive materials such as metal oxide semiconductor, and the technology realizes quick response and primary identification of smell to a certain extent. In recent years, the introduction of micro-electro-mechanical system (MEMS) technology has driven the development of gas sensors toward miniaturization and low power consumption. However, the existing sensor has the problems of poor selectivity, slow response speed, unsatisfactory volume and integration level, serious performance consistency among different batches and the like, so that the built recognition model has low universality and is difficult to stably apply across equipment and batches, meanwhile, the existing device generally lacks accurate and consistent control on detection environment, so that sensor signals are greatly interfered by environment fluctuation, and an established odor characteristic database cannot be reliably reproduced and shared in different scenes due to lacking of a unified reference. Disclosure of Invention In order to solve the technical problems, the present disclosure provides a gas recognition device, a gas recognition method, and an electronic nose system. On one hand, the gas identification device comprises a constant-temperature gas circuit unit, a sensor array, a calibration unit and a data processing unit, wherein the constant-temperature gas circuit unit is used for receiving gas to be tested and providing a temperature-controllable test environment for the gas to be tested, the sensor array is used for acquiring information of the gas to be tested and converting the information into an electric signal, the calibration unit is connected with the data processing unit and used for generating a reference signal and transmitting the reference signal to the data processing unit to provide a calibration reference for the electric signal of the sensor array, the data processing unit is connected with the constant-temperature gas circuit unit and also connected with the sensor array, and the data processing unit is used for controlling the formation and switching of the test environment, receiving the electric signal and identifying the information of the gas to be tested. In a feasible embodiment, the constant-temperature gas circuit unit comprises a test cavity and a buffer cavity which are communicated with each other, wherein the test cavity is provided with a first exhaust valve, the buffer cavity is provided with a gas inlet valve for introducing the gas to be tested, a gas exhaust valve for exhausting the gas to be tested and a second exhaust valve, the first exhaust valve is used for exhausting residual gas in the test cavity, the second exhaust valve is used for exhausting residual gas in the buffer cavity, a butterfly valve is arranged between the test cavity and the buffer cavity, and the butterfly valve is used for controlling a gas passage between the test cavity and the buffer cavity to be opened or closed. In one possible embodiment, the constant temperature gas circuit unit further comprises a first flow meter and a second flow meter, wherein the first flow meter is arranged on the first gas circuit, the first gas circuit is communicated with the test cavity and used for adjusting the flow rate of the cleaning gas entering the test cavity, the second flow meter is arranged on the second gas circuit, the second gas circuit is communicated with the buffer cavity, and the second flow meter is used for adjusting the flow rate of the cleaning gas entering the buffer cavity. In a feasible embodiment, the constant temperature air path unit further comprises a temperature sensor, a heating element and a temperature controller, wherein the temperature sensor is arranged in the test cavity and connected with the temperatur