Surface acoustic wave biomedical detection platform temperature control system

Abstract

The invention discloses a surface acoustic wave biomedical detection platform temperature control system. The system comprises a surface acoustic wave detection platform, a temperature control subsystem and a driving detection circuit subsystem; the surface acoustic wave detection platform is connected with the temperature control subsystem and the driving detection circuit subsystem through leadwires; the surface acoustic wave detection platform comprises a surface acoustic wave detection platform sensing layer, a surface acoustic wave detection platform middle layer and a surface acoustic wave detection platform temperature control layer; and the driving detection circuit subsystem comprises a driving detection circuit, a microcontroller, an amplitude control module, a signal generatormodule and a power driving module. According to the system, the temperature transmission speed is high; the temperature lag is ignored, the temperature control effect is good, and the detection platform is in a transparent attribute; the requirement for observing a detected object in real time by a microscope can be met; and the system has the advantages of being simple in process and low in manufacturing cost. The defect that the temperature influence is not thoroughly eliminated by a frequency mixing method can be overcome; and the transparent attribute of a whole device can be kept, and therequirement for observing the detected object in real time by the microscope can be met.

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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