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Underground coal dust concentration analysis system

Author: YuanWei
Tutor: SuiQingMei
School: Shandong University
Course: Detection Technology and Automation
Keywords: Dust concentration Online Monitoring CCD Image Compression Photoelectric conversion
CLC: TD714.3
Type: Master's thesis
Year: 2008
Downloads: 341
Quote: 4
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Abstract


Today our country is mostly underground coal mining operations, coal mine each operating point in the production process will produce a large dust particles. The unique nature of dust particles determines its great dangers: induced occupational pneumoconiosis, accelerate machinery and equipment wear and shorten the life of precision instruments, and even lead dust explosion accidents. Currently coal dust concentration detection method and apparatus both technically and in the actual application process are difficult to overcome, there are some drawbacks: general sampling methods detect the instantaneous values ??can only collect sampling, the point of dust concentration can not be dynamically reflect workplace dust pollution, lack of representativeness, the process cumbersome, time poor and the measurement results errors. This study is designed specifically for a coal mine dust monitoring devices, and the correlations of experimental tests. The subject comes from Shandong Province Information Industry Department project \This device to microcontroller system as the main controller, using dust particle collector, microscopic CCD image sensors and other components as a detector in the image acquisition control chip under the coordination of soot particle size distribution obtained by the detector image, and the image After the image SAA7111 A / D conversion chip and TMS320VC5410 DSP series of image acquisition and compression, re-use and IP175A RTL8019AS Ethernet controller chip optical transceiver chip, using the UDP protocol through the cable the compressed image data to the ground control center, by the main Computer decompressed through a dedicated image processing algorithms to achieve a dust concentration calculated and displayed. Dust collector is a design focus of this article, has proposed two different schemes, in contrast to the experimental analysis on the basis of microscopic observation made exhaust sampling new program, this design overcomes the traditional program can only monitor the dust concentration measurement dust concentration at a point defects, making results more representative collection; using multiple measurements averaged current sample collection and other methods of reducing errors expanded measurement range; DSP and high-speed image data compression capabilities of networked considerably enhanced real-time detection of coal dust; automated way of working, so that dust concentration monitoring to achieve a real sense of \The program design issues with the DSP and microcontrollers and other related procedures designed microprocessor-based, stable and efficient assembly language selected as the programming language to achieve a power-on bootstrap procedure, SAA7111 control register initialization procedure, JPEG image compression coding Programs and RTL8019AS Remote DMA write programs. DSP assembly language program as the core JPEG image compression procedure. In the algorithm, according to the TMS320VC5410 DSP series of special instruction system for JPEG algorithm is optimized to take full advantage of the DSP hardware resources, reducing the image compression processing time and improve the overall system in real time. This device proved by experiments of soot collected online real-time distribution image is in line PC image processing algorithms required by the compressed coal dust concentration is calculated on the impact does not exist.

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CLC: > Industrial Technology > Mining Engineering > Mine safety and labor protection > Mine atmosphere > Mine dust > Mineral dust measurement methods and measuring instruments
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