Study Of Combustible Gas Detection Technology Based On Internet Of Things And NDIR

In the production, transportation, storage and use process of combustible gas, there is great risk of serious fire or explosion once a leakage occurs. It is very serious to threat people’s lives and property. For alarming combustible gas leakage, it is necessary and effectively monitoring the concentration of combustible gas in the environment. By connecting safe equipment, combustible gas detector can play a security role. Commonly, catalytic combustion and electrochemical gas sensor was used to monitor combustible gas. Due to their shortcomings, these sensors bring all sorts of malpractices in used. There are many advantages of dual wavelength infrared technology like that more gas measurement, wide measuring range, high sensitivity and accuracy, stability, and good selectivity, high reliability, long life. In recent years, with the development of Internet technology, Internet of things is finding wider and wider application fields. The convenience and economic benefits are also very large. Combustible gas leakage monitoring devices connected to the Internet, it can break the regional restrictions and form a more effective combustible gas leak monitoring system.This article study combustible gas detection technology based on Internet of things and NDIR from the following several aspects:1. The structure design of combustible gas detectors based on NDIRBecause of combustible gas usually absorb infrared very weak, the detector increase reflected light path through using a gold-plated spherical reflector. In order to ensure the light would be reach the reflector, a condenser was added in the front of the light source. At the same time, a collector was setup front-end dual wavelength infrared detector. By all the measures a suitable strength signal was acquired.2. Temperature compensation and concentration calibration experimentsWe found that the outputs of the detector are greatly influenced by temperature. So, we have to collect the data under different temperature. Experiment of concentration calibration is conducted in constant temperature20℃. By analysis of data, we choose absorption coefficient D as input variables what was ruled out the fluctuation cause by the light source and the temperature. Relatively stable output results are obtained.3. Detect network technology based on the Internet of things Detector can access to the Internet by using the embedded structure design. Two kinds of detection system network structure were put forward. And the corresponding testing software was design. Users can choose any one of them according to their demand.Through the above steps, a NDIR combustible gas detector was development and combustible gas detection network can be composed. These research works provides a train of thought for establishing effective combustible gas detection system.