Method for measuring gas concentration by air-sensitive ultra-magnetostriction thin film

Abstract

The invention discloses a method for detecting gas concentration by using gas-sensitive giant magnetostrictive film, belongs to the field of application of giant magnetostrictive film, and relates to a method for detecting gas concentration by using gas-sensitive giant magnetostrictive film with gas sensitive characteristics. The method comprises: coating a gas sensitive layer on a giant magnetostrictive film by adopting a whirl coating method to form the gas-sensitive giant magnetostrictive film, placing the gas-sensitive giant magnetostrictive film into a Helmholtz coil to vibrate, obtaining the concentration of the detected gas through measuring resonance frequency of the gas-sensitive giant magnetostrictive film reacted with the detected gas, and measuring the concentrations of different gases through changing the gas sensitive layer of the gas-sensitive giant magnetostrictive film. The method comprises the steps of firstly preparing the gas-sensitive giant magnetostrictive film, then building a detection platform, and finally detecting the concentration of the gas by using a calibration curve. The method for detecting the gas concentration has the advantages of wide application range, high accuracy, strong real-time property and capability of remote detection.

Description

technical field [0001] The invention discloses a method for detecting gas concentration by using a gas-sensitive giant magnetostrictive film, which belongs to the application field of giant magnetostrictive films, and relates to a method for detecting gas concentration by using a gas-sensitive giant magnetostrictive film with gas-sensitive characteristics. Background technique [0002] There are many kinds of gas sensors, such as piezoelectric gas sensors, metal oxide gas sensors, etc. Current gas sensors have some defects, such as metal oxide sensors need to operate at higher temperatures; optical sensors cannot detect relevant parameters in airtight containers and opaque vessels; although surface acoustic wave sensors and piezoelectric microbalance sensors are used It is widely used in the detection of small changes in parameters such as temperature, concentration, and pressure. However, since the sensor must be in direct contact with the surface of the detection object, i...

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Problems solved by technology

[0004] The technical problem mainly solved by the present invention is to invent a gas concentration detection method for the deficiencies of the above-mentioned existing gas concentration sensors, by preparing a gas-sensitive giant magnetostrictive film and vibrating it in an alternating driving magnetic field, and then measuring The first-order natural frequency after the gas-sensitive giant magnetostrictive film reacts with the measured gas, and then the gas concentration is obtained according to the calibration curve to accurately measure the gas concentration

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