1. Application background
With the development of science and technology, various medical devices have come out one after another and have been widely used. Many medical instruments in the application integrate high-tech technologies such as sensors, automatic control, computer software and hardware. Most of the control systems of medical instruments on the market are implemented by single chip microcomputers, which generally have the disadvantages of cumbersome operation, no graphical operation interface and unintuitive display. The use of a PC as the thermotherapy device at the control end increases the cost of the equipment. These factors restrict the rapid popularization of many applications.
Because ARM embedded technology can make the control system miniaturized, and the developed products have powerful functions, low cost, and high cost performance. Therefore, we have developed a new type of medical image data acquisition device based on ARM embedded system and equipped with Linux operating system according to the market needs of medical instruments. The system has the characteristics of high control integration, stable operation, convenient operation and intuitive graphical interface display.
2. Successful case
The core components and operating systems of medical analysis instruments
Core components of medical image acquisition equipment based on gamma rays
3. System architecture
This system is mainly used to realize the digital collection, processing and data transmission of medical image data.
The data processing flow of the entire system is shown in Figure 1. The input signal is the pulse signal data reflecting the position information of multiple channels generated by the nuclear ray receiving sensor and the energy data of one channel. The pre-amplifier board enters the high-speed AD chip plus FPGA high-speed digital signal processing board. The subsequent data enters the main processor with ARM as the core for energy, linearity and uniformity correction and forms an image frame. The network interface is sent to the collection computer, and the collection computer displays and saves the image.
4. System hardware design
Medical image signal acquisition and processing system mainly includes AD acquisition and FPGA digital signal processing board and ARM computer board. The main role of the ARM computer board is to complete the final image correction, data transmission, acquisition control and other functions.
5. System software design
The embedded operating system plays a vital role in the system. The solution relies on the high-performance Linux operating system to realize the control of the data collection terminal and the real-time transmission and processing of data.
6. Solution advantages
Medical image signal acquisition and processing system A medical information data acquisition and control system solution implemented with a high-performance ARM processor. The peripheral of the system can realize high-precision and high-speed data collection; the peripheral interface is rich in resources; it runs the embedded Linux operating system. Compared with traditional solutions, modularity, low power consumption, and open interfaces make the system easy to expand and transplant according to actual needs. Its reliable, accurate and low-cost design is a practical remote data acquisition control system solution.
Applications:
The Grounding Transformer is a kind of auxiliary transformer that used to offer an earth point for the Delta-Star system. They are typically used for providing a path to ground for unbalanced load current and for fault currents on system where a suitable ground is otherwise not available.
Design:
The grounding transformers are generally designed with one of the two configurations: Zig-Zag (Zn) with or without an auxiliary winding or a Wye (Ynd) with a delta connected secondary. The Zig-Zag connection is preferred as it is more cost effective and have smaller size than the Delta-Wye unit. For more safety, neutral earthing resistors (NER) are often used in conjunction with the grounding transformer to limit neutral ground fault current magnitude. The rated voltage of the NER should be equal to the line to ground voltage of the grounding transformer. The current rating and duration should match the grounding transformer
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Grounding Transformer
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