Gas ultrasonic transducer impedance gradient matching layer and preparation method thereof

Abstract

The invention discloses a gas ultrasonic transducer impedance gradient matching layer and a preparation method. Raw materials comprise a base material composed of epoxy resin E-51 and 593 epoxy resin curing agents and a reinforcing material of modified hollow quartz powder. The preparation method comprises the following steps: firstly, preparing the matrix material, uniformly mixing the epoxy resin E-51 and the 593 epoxy resin curing agent, and performing ultrasonic dispersion in an ultrasonic cleaning machine to obtain the matrix material; preparing a matching layer precursor, adding the modified hollow quartz powder into the matrix material, performing ultrasonic dispersion in an ultrasonic cleaning machine, and performing vacuum-pumping treatment in a vacuum oven to obtain the matching layer precursor; and finally, preparing a matching layer, pouring the matching layer precursor into a mold, conducting curing, taking the combined part of the glue phase and the powder phase, gradually reducing the density from the glue phase to the powder phase, namely gradually reducing the impedance, and preparing the matching layer with the required shape. The process is simple, the raw materials are easy to obtain, the cost is low, and more effective matching of the piezoelectric ceramic and the gas medium in the gas ultrasonic transducer is achieved.

Description

technical field [0001] The invention relates to the technical field of gas ultrasonic sensors, in particular to a gas ultrasonic transducer impedance gradient matching layer and a preparation method thereof. Background technique [0002] The matching layer used in the traditional gas ultrasonic sensor, because its material is organic matter and nano-inorganic powder with uniform particle size, the material cost is high, the processing difficulty and processing cost are relatively high, which directly leads to the high cost of gas ultrasonic sensor; The requirement of the matching layer is low acoustic impedance, and it is difficult for the existing matching layer to meet the theoretical requirements in terms of density and acoustic impedance. Contents of the invention [0003] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a gas ultrasonic transducer impedance gradient matching layer and its prepar...

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Problems solved by technology

[0002] The matching layer used in the traditional gas ultrasonic sensor, because its material is organic matter and nano-inorganic powder with uniform particle size, the material cost is high, the processing difficulty and processing cost are relatively high, which directly leads to the high cost of gas ultrasonic sensor; The requirement of the matching layer is low acoustic impedance. It is difficult for the existing matching layer to meet the theoretical requirements in terms of density and acoustic impedance.

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