General gas measuring method based on ultrasonic transducer and device

Abstract

The invention discloses a general gas measuring method based on an ultrasonic transducer and a device. The method comprises the following steps: establishing a set of ultrasonic dispatching devices in different frequencies in an airtight chamber; introducing a to-be-measured gas into the airtight chamber; emitting the ultrasonic waves in different frequencies; accurately moving under the effects of a stepping motor and a guide rail, thereby changing a distance between an ultrasonic wave emitting terminal and a receiving terminal; adopting an external extracting pump for adjusting the pressure of the to-be-measured gas in the chamber, measuring and acquiring the sound velocities and sound attenuation coefficients under the conditions of different frequencies, pressures and distances and correcting the sound attenuation coefficients; drawing a spectrum graph of the corrected sound attenuation coefficients about the ultrasonic frequencies; and comparing the drawn spectrum graph with the spectrum in a preset sample library and confirming the variety and concentration of the to-be-measured gas. The gas measuring method and device provided by the invention can measure most noncorrosive gases and have the advantages of wide measurement scope, no requirement for special gas sensor, low cost, capability of online real-time monitoring, high response speed, long-term stability, and the like.

Description

technical field [0001] The invention belongs to the technical field of gas measurement, and more specifically relates to a general gas measurement method and device based on an ultrasonic transducer. Background technique [0002] In the traditional gas detection technology, one sensor can only detect one gas, and the detection of mixed gases requires the cooperation of multiple sensors, which increases the difficulty of debugging and installation, and increases the cost of testing; in the atmosphere, aerospace, environment In the detection of gas, especially the precision test of natural gas and other mixed gases, in-pipeline, large-scale, and real-time detection requirements, traditional gas detection technologies cannot meet the needs of real-time detection, detection accuracy, and low-cost detection; and The service life of traditional various gas sensors is limited, generally 2-5 years, resulting in high detection costs. [0003] In recent years, research and breakthrou...

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a general gas measurement method and system based on an ultrasonic transducer, the purpose of which is to solve the problem that each gas must be measured with a special sensor in the current gas measurement. , high cost and poor durability technical problems

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