Acoustic fluid sensor

Abstract

The embodiment of the invention provides an acoustic fluid sensor. The acoustic fluid sensor comprises a slit double-plate acoustic device, an ultrasonic transmitting device, a computing processing device and an experimental vessel; the slit double-plate acoustic device comprises two parallel substrates which are spaced with a slit space which is used for containing to-be-detected fluid, and each substrate is provided with equally-spaced raised lines; the slit double-plate acoustic device is immersed in environmental fluid; the ultrasonic transmitting device transmits ultrasonic into the environmental fluid, the two substrates arranged in the slit double-plate acoustic device are stimulated to form non-leaky A0 mode Lamb waves and form a symmetric strong local mode through resonant coupling in the slit space, and the computing processing device determines parameters of the to-be-detected fluid by computing frequency points and amplitudes of resonant transmission enhancement peaks in an ultrasonic spectrum. According to the acoustic fluid sensor, only a trace amount of to-be-detected fluid is needed, high sensitivity and quality factors can be achieved, and the sensor is particularly sensitive to fluid opposite to density and acoustic velocity change trends.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of fluid detection, and more specifically, embodiments of the present invention relate to an acoustic fluid sensor. Background technique [0002] This section is intended to provide a background or context for implementations of the invention that are recited in the claims. The descriptions herein are not admitted to be prior art by inclusion in this section. [0003] Rapid and accurate analysis of components and parameters in microfluids has important application value in biochemical detection, clinical medical diagnosis, environmental monitoring, food safety monitoring and other fields, and is an important development direction in the current and future sensor field. At present, fluid sensors are mainly divided into two types: physical parameter extraction and chemical reaction. Among them, the physical parameter extraction type is mainly divided into two types: optical sensor and a...

AI Technical Summary

Problems solved by technology

[0006] In view of the problems that the existing acoustic fluid sensors formed by acoustic artificial structures are not good enough in terms of quality factor and sensitivity, the inventors found that this is mainly caused by the local area produced by the existing acoustic fluid sensors in the process of researching the present invention. The size of the field range is equivalent to the wavelength, and the strength of the local field is weak. Therefore, it is necessary to further study the acoustic artificial structure with a higher quality factor to realize the development of high-sensitivity sensors.

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