Device and method for detecting sulfur dioxide gas

Abstract

The invention discloses a device and a method for detecting sulfur dioxide gas. The device comprises a quantum cascade laser (1) and a driving power supply (7) thereof, a ZnSe lens (2), a gas chamber (3), a double-path microphone power supply (4), a phase-locking amplifier (5) and a computer (6), wherein the driving power supply (7) excites the quantum cascade laser (1) to emit middle infrared light with the wavelength of 7.36 micrometers, the middle infrared light is converged into parallel light through the ZnSe lens (2) and enters the gas chamber (3) in which sound signals are generated, the sound signals are respectively collected and transmitted to the double-path microphone power supply (4) by a pair of high-sensitivity microphones in the gas chamber and then are transformed into electric signals, the generated electric signals are inputted to the phase-locking amplifier (5) for differencing and signal extraction, and finally signal values are recorded and stored by the computer (6), thereby obtaining the concentration of gas to be detected by calculating the signal values. The invention solves the problems of high time consumption, insensitive reaction, complicated operation and tedious equipment maintenance of the traditional method for measuring gas concentrations.

Description

technical field [0001] The invention relates to the technical field of sulfur dioxide gas detection, in particular to a device and method for detecting sulfur dioxide gas. Background technique [0002] Sulfur dioxide is a poisonous gas. People with heart disease and respiratory diseases are most sensitive to this gas. Even normal people can get sick if they stay in places with high sulfur dioxide concentration for too long. When the concentration of sulfur dioxide in the air is only 1ppm, people will feel a sense of oppression in the chest. [0003] Sulfur dioxide mainly comes from the combustion of coal and oil. my country is a big coal-producing country, but also a big country that consumes coal and oil. At present, the economic losses caused by acid rain and sulfur dioxide pollution to the ecological environment and human health are about 110 billion yuan every year in China. In the future, this kind of pollution will continue to increase with the development of China. T...

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Problems solved by technology

[0011] The main purpose of the present invention is to provide a device and method for detecting sulfur dioxide gas, so as to realize the detection of sulfur dioxide gas and solve the problems of long time-consuming concentration measurement, insensitive response, complicated operation and cumbersome equipment maintenance.

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