Portable electrical impedance detection system

Abstract

The invention discloses a portable electrical impedance detection system which adopts an ARM embedded Linux system as main control and consists of a wireless communication module, a DDS signal generator, a preamplifier, a voltage controlled constant current source, an analog multiplexer, an operation-amplification filter module, a data acquisition circuit, an FPGA and an electrode sensor as peripheral measuring equipment; an embedded Qt environment is adopted for software development, a cloud server is built, and a networked, informationized and intelligentized biological electrical impedancedetection platform is realized with cooperation of a client APP. The problem of matching of bandwidth and output impedance is fully considered, and high-quality imaging, high-accuracy decision making,easy carrying and consulting are achieved. The electrical impedance sweep frequency measurement embedded system has simple structure, meets the requirements of frequency range and accuracy, greatly reduces the cost and size, designs an overall scheme based on the Internet, and makes up for the deficiency that general portable impedance measurement equipment can only be used for measuring locally.

Description

[0001] Technical field: [0002] The invention relates to a portable electrical impedance detection system, in particular to an internet-based portable biological tissue electrical impedance sweep measurement embedded system. [0003] Background technique: [0004] Electrical impedance tomography (EIT) is a process tomography developed from electrical capacitance tomography (ECT) and electrical resistance tomography (ERT), and has shifted from the industrial field to the biomedical field in recent years. This measurement method distributes electrode sensors around biological tissues, injects safe sinusoidal excitation signals through sweeping frequency, acquires waveforms passing through biological tissues through high-speed signal acquisition devices, and analyzes and processes them. The different electrical conductivity characteristics in different states can reconstruct the electrical conductivity distribution image inside the tissue, so as to determine whether there is a le...

AI Technical Summary

Problems solved by technology

[0006] Most of the electrical impedance measurement equipment currently on the market needs to use a PC as the upper computer, which is bulky, complicated to operate, redundant in function, low in automation, not portable, and limited to use in laboratories and other occasions.

Most electrical impedance measurement equipment can only image at a single frequency, and cannot realize the frequency sweep function, so it is impossible to obtain the impedance spectrum of biological tissue cells, and the impedance spectrum also carries a large amount of cell information; secondly, it is impossible for untrained personnel to measure the impedance Spectrum or tomographic images are analyzed, and preliminary decisions cannot be made automatically on the detection results; finally, almost no electrical impedance measurement equipment has the function of Internet cloud connection, which is not conducive to the storage of generated images and reports and the development of medical intelligence

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