Gas detector with compensation function and compensation method

Abstract

The invention discloses a compensation method for a gas detector with a compensation function. The method includes the following steps of: firstly, establishing a compensation algorithm model of gas sensor readings; and then, internally installing a gas sensor compensation program applying the compensation algorithm model in a memory of the gas detector to compensate for the output readings of thegas detector in actual work. The gas sensor output is not only related to the tested gas concentration, but also to the ambient temperature, ambient humidity and cumulative usage time of the sensor,wherein the ambient temperature, the ambient humidity and the cumulative usage time are interference physical quantities. The gas detector with the compensation function designed by the invention is provided with a gas sensor, is also provided with a temperature detector and a humidity detector, records the cumulative working time of the gas sensor, adopts a built-in compensation correction algorithm, calculates the influence of the ambient temperature, the ambient humidity and the cumulative usage time on the gas sensor readings in the actual work, eliminates the interference physical quantities, and accurately reflects the concentration of a target gas.

Description

technical field [0001] The invention relates to a gas detector, in particular to a gas detector with compensation function and a compensation method. Background technique [0002] Gas sensors are widely used in home environment detection, industry, fire protection and other fields. However, in the actual application environment, the ambient temperature and humidity will have an impact on the readings of the gas sensor, and as the cumulative use time of the gas sensor increases, the performance of the gas sensor will also attenuate, and its readings will shift for a long time. The offset is cumulative, if not compensated, it will cause the gas detectors relying on the gas sensor to produce wrong readings, resulting in misjudgment or missed judgment of the actual gas environment conditions. At present, in actual use, the method of regularly calibrating the sensor is used for calibration, but this method is not convenient for gas detectors to be installed in confined spaces an...

AI Technical Summary

Problems solved by technology

However, in the actual application environment, the ambient temperature and humidity will have an impact on the readings of the gas sensor, and as the cumulative use time of the gas sensor increases, the performance of the gas sensor will also attenuate, and its readings will shift for a long time. The offset is cumulative, if not compensated, it will cause the gas detector relying on the gas sensor to produce wrong readings, resulting in misjudgment or missed judgment of the actual gas environment

At present, in actual use, the method of regularly calibrating the sensor is used for calibration, but this method is not convenient for gas detectors to be installed in confined spaces and places that are inconvenient to disassemble.

[0003] Patent Publication No. CN102680518 proposes a compensated gas sensor and its temperature and humidity compensation method. This method takes into account the influence of temperature and humidity factors on the output of the gas sensor, but does not consider the long-term cumulative offset caused by the cumulative working time of the sensor to the gas sensor.

In addition, in this patent, the establishment of a compensation coefficient database is used to correct the gas sensor readings by checking the corresponding compensation coefficients from the compensation coefficient query database and then performing calculations. The accuracy is related to the sample density of the comparison table. If In order to achieve high precision, it is necessary to establish a database with a large amount of data. In the actual process, a large number of query calculations are required, which is not convenient for application in embedded systems.

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