Detection device based on saw sensor

Abstract

The invention discloses a detection device based on a SAW sensor, which can realize the sealing of biological detection liquid and the sealing method is low in cost, simple and effective. The detection device includes a base plate, a base body, and a SAW chip. A detection circuit is arranged on the base plate; The wafer is arranged in the wafer groove and fixed on the base plate. The groove bottom of the wafer groove is provided with an annular groove, and a sealing ring is arranged in the annular groove. The sealing ring is in common with the induction film of the SAW and the groove bottom of the wafer groove. A closed detection space is formed, and a drainage hole is opened in the middle of the annular groove. The detection device prevents the biological detection liquid from leaking, and at the same time can ensure more accurate detection results, and the biological detection liquid can easily flow into the detection space due to the existence of the drainage hole. It is suitable for popularization and application in the technical field of detection equipment.

Description

technical field [0001] The invention relates to the technical field of detection equipment, in particular to a detection device based on a SAW sensor. Background technique [0002] SAW was discovered by British scientist Rayleigh in the process of studying seismic waves in the 1880s, but the technology was limited at that time, and SAW was not used in practice; in 1965, American scientists White and Voltmer invented metals that can excite surface waves on the surface of piezoelectric crystal materials The interdigital transducer and the effective detection of surface acoustic wave signals make SAW widely used. [0003] SAW belongs to the piezoelectric sensor, which is based on piezoelectric material, utilizes the piezoelectric effect, and realizes the mutual conversion of electrical and acoustic signals through interdigital transducers. It has the advantages of simple structure, small size, low cost, short response time and high sensitivity. , good reliability and other adv...

AI Technical Summary

Problems solved by technology

[0006] Existing detection devices based on SAW sensors are bulky in size, high in manufacturing cost, and low in detection efficiency, and cannot meet real-time detection requirements. Moreover, existing detection devices based on SAW sensors have no seals for liquids or adopt plastic curing and sealing methods. No seals make Detect liquid leakage, and the test results are inaccurate at the same time, the plastic solidifies and seals to form a permanent seal, and the device is difficult to disassemble

In addition, the existing detection devices based on SAW sensors use wires, electrode sheets, and electrode needles to connect detection lines, which is cumbersome in circuit layout and high in processing costs.

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