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Portable Methane Concentration Detector of the Mine Based on PIC16F1937 Microcontroller

Author: WangMeiZi
Tutor: DongGuanJun
School: Taiyuan University of Technology
Course: Control Theory and Control Engineering
Keywords: Methane concentration Portable PIC microcontroller Tester
CLC: TP216.1
Type: Master's thesis
Year: 2011
Downloads: 216
Quote: 1
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Abstract


Coal gas explosion is one of the major disaster, a grave threat to the safe production of coal mines. The methane gas is the main ingredient in the gas, so if able to timely and accurately detect the content of the methane gas in the mine safety in the production process has a very important significance. When the concentration of the gas in the mine reaches a certain value may cause gas explosion caused a coal mine gas explosion occurred, causing casualties and huge property losses in our country, but also makes the countless victims of the miners' families caught in a hopeless situation, so accurately detect the concentration of methane gas in coal production has an extremely important significance. Measuring instruments when the limit is reached when the concentration of methane in a timely manner to issue audible and visual alarm signal in order to take immediate and effective security measures, can effectively prevent the explosion, and the event of a major disaster. Some of the shortcomings of the traditional gas detection equipment because of the large volume, high cost, inconvenient to carry and often need to be calibrated so can not meet the needs of the industrial production, designed a portable methane concentration analyzer, it can be very easily detected the concentration of the methane gas. The whole system has a small volume, simple structure, low cost, and high sensitivity, but also relatively easy to operate, and relatively long service life characteristics. This paper designed a the PIC16F1937 microcontroller mine portable methane concentration meter using a high-performance operational amplifier circuit for small signal operation to enlarge, the PIC16F1937 MCU to complete the signal acquisition and processing, in addition to be able to display the measured concentration outside, audible and visual alarm signal, but also has a display time and display function of temperature, strong practical value. LED digital tube can be displayed in real time the value of the concentration of methane, when the concentration of methane gas in the gas to be measured exceeds a set value when the sound and light alarm signal will be issued. Experimental results show that the sensitivity of the measurement instrument and measurement accuracy is relatively high, and is easy to operate, and be detected in real-time as well as the characteristics of data processing capability is relatively strong, relatively high stability, and the explosion-proof performance is better, faster response speed, and can also be extended applied to the detection of other gas systems. For coal mine work environment is quite poor, intelligent design portable methane concentration detector at a critical part of waterproof and dustproof measures should be taken. Because it is based on portable design, small size, so it can be installed in coal miners carry equipment up the real-time determination of the concentration of methane gas. Firstly leads the research background, research status, as well as reality topics of significance. Followed by analysis and overall system design, the next design the the PIC16F1937 microcontroller-based mine portable methane concentration detector hardware circuit, including methane gas sensor, microcontroller processing and control circuit, display circuit, sound and light alarm circuit and system The power supply circuit and so on. Then designed based the PIC16F1937 microcontroller mine portable methane concentration detector software program as well as the host computer software design. Next, some experimental design program, conducted a comparative experiment, repetitive experiments, cross-sensitivity of the experiment, stability experiments, shows some of the experimental data was analyzed, and error of the system so that it can better be applied mine-site, real-time measurement of the concentration of methane gas. The paper concludes the work done, and introduced based on the the PIC16F1937 microcontroller mine portable methane concentration detector innovation and future development trend.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Automatic testing equipment,instruments > Automatic measuring instruments
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