A surface acoustic wave biomedical detection platform temperature control system

Abstract

A surface acoustic wave biomedical detection platform temperature control system, including a surface acoustic wave detection platform, a temperature control subsystem, a drive detection circuit subsystem, and the surface acoustic wave detection platform is respectively connected to the temperature control subsystem and the drive detection circuit subsystem via wires Connection, the surface acoustic wave detection platform includes the sensing layer of the surface acoustic wave detection platform, the middle layer of the surface acoustic wave detection platform, the temperature control layer of the surface acoustic wave detection platform, the driving detection circuit subsystem includes the driving detection circuit, microcontroller, amplitude control module, signal generator module, power driver module. The invention has fast temperature transfer speed, negligible temperature hysteresis, good temperature control effect, transparent detection platform, can meet the requirement of real-time observation of the measured object with a microscope, and has the advantages of simple process and low production cost. The invention can eliminate the defect that the frequency mixing method does not completely eliminate the influence of temperature; can maintain the transparent property of the whole device, and can meet the requirement of real-time observation of the measured object with a microscope.

Description

technical field [0001] The invention relates to the field of detection equipment, in particular to a surface acoustic wave biomedical detection platform temperature control system. Background technique [0002] Surface acoustic wave (SAW) is an elastic wave whose energy is concentrated on the surface of the medium. In the prior art, the core of widely used surface acoustic wave technology is to fabricate metal interdigital transducers (IDT) on piezoelectric material substrates. When an AC signal of a specific frequency is applied to the IDT, the electrical signal can be converted into an acoustic wave. The acoustic wave signal propagates along the surface of the piezoelectric substrate and is finally received by another IDT, which is converted into an electrical signal output through the piezoelectric effect. In practical applications, when detecting substances, if there is mass deposition on the surface of the sound wave propagation path or the surface material changes, the...

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Problems solved by technology

Although this method has a certain offsetting effect, since the parameters of the two signal-related devices cannot be completely consistent, it cannot completely offset the influence of factors such as temperature.

The third is to use a semiconductor refrigerating sheet, which is attached to the back of the SAW device, and the temperature is adjusted according to the needs; although this method is widely used in various fields, in the field of biomedical detection, such as microfluidic devices The use of SAW for relevant biomedical testing in the world often requires a microscope to observe the measured object in real time, and the detection platform is required to be a transparent device. Obviously, due to the opacity of the semiconductor refrigeration sheet, the semiconductor refrigeration sheet cannot meet this requirement.

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