Gas density intelligent test system and method

Abstract

The invention relates to a gas density intelligent test system and a method thereof. The system mainly comprises a light interference gas sensor, a signal conditioning circuit, a temperature sensor, a pressure sensor, an A / D converter, a data collecting and processing module, a timing clock signal generator and an upper computer. The invention is characterized in that the light interference gas sensor, the temperature sensor and the pressure sensor measure gas density, temperature and pressure respectively; the upper computer reads the data of gas density, temperature and pressure in the datacollecting and processing module and the data of year, month, date and time generated by the timing clock signal generator, and the true gas density value of the measured point is calculated by the upper computer and displayed on a display, or the variation curve of the true gas density value along with sharp time is displayed. The invention has simple operation and high measurement accuracy, strengthens real-time data processing and revising capabilities, and proposing a new approach for automatically detecting and telemetering coal mine underground gas.

Description

technical field [0001] The invention belongs to the technical field of gas concentration measurement, and in particular relates to an intelligent gas concentration testing system and method based on microprocessors, computers and double-beam interference technology. Background technique [0002] The safety hazards of underground coal mine work mainly come from the high concentration of gas content. The main component of gas is methane, which is a colorless and odorless gas. It is difficult for people to feel its existence from their own physiological functions. The detection mainly depends on the instrument and equipment. At present, the measurement of gas mainly includes thermal catalytic element detection method, gas-sensitive semiconductor element sensor, optical interference gas detection method and infrared absorption detection method. In these methods, thermal catalytic elements and gas-sensitive semiconductor elements are used as sensors. The temperature, humidity, a...

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Problems solved by technology

In these methods, thermal catalytic elements and gas-sensitive semiconductor elements are used as sensors. The temperature, humidity and oxygen content of the measurement points, as well as the inherent defects of the components themselves, will make the stability of the sensor worse and the measurement accuracy lower; The infrared absorption method has the disadvantages of complex structure and high price, which are not conducive to mass promotion; the optical interference gas detection method has the advantages of high measurement accuracy, durability, and can measure high and low concentrations

For example, in terms of gas detection based on optical interference, Chinese patent 91205283.X "Intelligent optical interference gas detector" uses a microprocessor for data processing; patent 200520033421.0 "Portable intelligent optical interference methane detector" uses light sources The optical path and other improvements have been made; the patent 200810195648.3 "Optical Interference Methane Detector" has also improved the optical path used and the connection method between the gas chamber and the outside world, but to obtain the gas concentration value, it is worth observing the optical interference fringes with human eyes, etc. , the operation process is relatively complicated, the detection speed is slow, and even inaccurate

In short, when detecting gas concentration in the prior art or method, the temperature and air pressure of the measured point cannot be measured simultaneously and in real time, therefore, the real gas concentration value cannot be given, and the law of gas change cannot be displayed in the form of a graph. In addition, the measurement data has no correlation with time, which is not conducive to the automatic detection and telemetry of underground gas, and is not conducive to the establishment of an underground gas network measurement system

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