Self-correction method for detecting carbon dioxide concentration by adopting non-dispersive infrared technology

Abstract

The invention relates to the field of a method for detecting gas concentration by adopting a non-dispersive infrared technology, and specifically relates to a self-correction method for detecting carbon dioxide concentration by adopting the non-dispersive infrared technology. According to the method, detection is performed by adopting an non-dispersive infrared detector, the non-dispersive infrared detection part comprises an infrared source, a single-window detector, a gold-plating gas chamber and a data acquirer, wherein a temperature sensor is arranged in the single-window detector, and a buffer area and a register are arranged in the data acquirer. The self-correction method is characterized by performing the steps of preparing, self-correction data processing and temperature compensating in sequence. The method provided by the invention is precise and reliable to measure, strong in interference resistance, and good in long-time working stability.

Description

technical field [0001] The invention relates to the field of methods for measuring gas by using non-dispersive infrared technology, in particular to a self-correcting method for detecting carbon dioxide concentration by using non-dispersive infrared technology. Background technique [0002] In industrial and agricultural production, the concentration of carbon dioxide is often detected. In the early days, electrochemical and thermal conductivity sensors were used. These sensors are small in size, but have poor anti-interference performance and unstable performance for a long time. Solid electrolyte sensors are also used. The operating temperature of this sensor is High, high heating power consumption. At present, the most widely used sensor is non-dispersive infrared (English full name non-dispersive infrared, referred to as NDIR). The principle of NDIR detection is to detect the absorption of specific wavelengths by carbon dioxide molecules, and then according to the measur...

AI Technical Summary

Problems solved by technology

One window of the double-window type is a reference window. The wavelength absorbed by this window is not affected by carbon dioxide, and the wavelength absorbed by the other window is related to carbon dioxide. The signals output by the two windows can be compared and converted to eliminate light source aging, gas The impact of factors such as dust entering the chamber can also reduce the impact of temperature changes, so the double-window type has high detection accuracy and stable work, but the price is high

A single window without a reference window will be affected by the above factors, but the price is relatively cheap

However, the single and double window detectors will produce linear drift after a certain period of time, and the measurement results will be different due to the different atmospheric pressures in various places. This requires recalibration of the detector. Standard gas is required for calibration. Calibration with special calibration equipment, complex operation and difficult maintenance