Metal-oxide gas sensor array concentration detecting method based on drift compensation

Abstract

The invention provides a metal-oxide gas sensor array concentration detecting method based on drift compensation. According to the method, the independent component analysis is utilized, the influence of abnormal values caused by the environment temperature, the environment humidity and environment factors to the drifting regulation and the drifting quantity estimation is shielded, the law that a independent concentration component changes along with the time drifting under the condition of base line responses is found out, subsequently, and when the concentration detection treatment on a gas sample is subjected to the concentration detection treatment by a metal-oxide gas sensor array, the drifting quantity of the concentration independent component is estimated by using the law that the independent concentration component changes along with the time drifting under the condition of the base line responses, so as to carry out drifting compensation on the independent concentration component in concentration detection response data; and the prediction calculation is carried out through using a concentration prediction function by virtue of the independent concentration component subjected to the drifting compensation in the concentration detection response data, so as to obtain a sensitive gas concentration detection result. The precision in estimating the drifting law and the drifting amount can be effectively improved, and the accuracy of concentration detection of the metal-oxide gas sensor array is ensured.

Description

Technical field [0001] The present invention relates to the field of gas sensor technology and computer processing technology, in particular to a method for detecting the concentration of a metal oxide gas sensor array based on drift compensation. Background technique [0002] The drift problem of gas sensor has been plagued people for a long time. The factors that cause the drift of a gas sensor are more complicated, such as the aging of the sensor itself, the “contamination” of a certain gas, changes in environmental factors such as temperature and humidity, etc., among which changes in ambient temperature and humidity have obvious effects on the drift. The traditional drift suppression method focuses on providing a stable test environment, or improving the device structure and designing a compensation circuit to eliminate environmental impact. However, these methods not only complicate the device structure, but also increase the manufacturing cost of the device. Therefore, a...

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Problems solved by technology

However, the metal oxide gas sensor array also faces the problem of drift, and the drift after long-term use will affect the accuracy of the metal oxide gas sensor array for sensitive gas concentration detection.

Some studies have tried to use statistical methods to find the law of the resistance R drifting with time when the metal oxide gas sensor detects the concentration of sensitive gases. value and the logarithmic linear correspondence lgR=αlgc+β for concentration detection, but since the resistance value R of the metal oxide gas sensor is obtained by converting the response value, it is also affected by the ambient temperature, humidity, sensitive gas concentration, and time-dependent Even if the temperature and humidity conditions are fixed, the resistance R is still at least a two-dimensional variable of the sensitive gas concentration and the drift over time. It is difficult to directly calculate the drift of the resistance R over time. In addition, it is very difficult to ensure that the temperature and humidity conditions are fixed in the actual environment. In addition, the actual collected detection response data also contains abnormal value data caused by environmental pollution, noise, etc. These factors make the resistance based on the resistance value The concentration detection scheme for R drift estimation and compensation is difficult to be implemented in practical applications

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