Optical Fiber Interferometric Demodulation Based On ARM

This article details the algorithm design part of a smart mattress design.With the improvement of people's living standards,the problem of retirement has become increasingly prominent,and everyone's attention to health has also increased.Under the background of vigorous development of smart homes,the detection of health status is also more intelligent and simplistic.The concept of smart homes,smart medical care,and wisdom for the elderly have also raised new demands for the development of the medical and health industry,indicating new directions.In order to meet the needs of the market and meet consumer health monitoring,this project has designed a smart mattress.The mattress is easy to use,can be used like an ordinary mattress,and does not require other excessive operations.The mattress can detect human heartbeat and respiratory signals,and through these signals a simple analysis of human health,but also can store this information in the cloud for long-term research,so it is suitable for ordinary home applications.This project was participated by more than one person and was completed through the division of labor and cooperation.I was responsible for the algorithm design of the signal processing part.The smart mattress uses a Michelson fiber optic interferometer based on a 3×3 coupler to measure human vital information,including heartbeat signals and respiratory signals.The fiber-optic interferometer collects and outputs analog signals,and uses the ADC of the ARM chip to convert analog signals into digital signals.The system implements a 3×3 interference demodulation algorithm in ARM.For the demodulated data,the curve fitting algorithm was designed to remove the trend items,and the high-frequency interference was filtered out using the data smoothing method of Five point three filter with the characteristics of the system's collected data.Finally,a simple interpretation of the data was performed to achieve the basic design goals.At the end of the article,the auxiliary circuits and auxiliary program modules used in the project are introduced.The most important feature of the project is to apply theoretical knowledge to practice.According to the book's basic principles and the needs of the market,it proposes corresponding product concepts.Through reasonable planning,the theory is put into practice and designed into actual products.