Research On Optical Fiber Grating Temperature Quasi-real-time Detection System For Remote Data Transmission Based On Embedded Web Services

With the advent of the information age,the combination of digital acquisition systems and the Internet to achieve remote monitoring has been integrated into all aspects of production and life.As the key technology of information digitization,FBG sensing technology has been widely used in many fields.In the future,it will further broaden the breadth and depth of its application.The embedded technology is introduced into the fiber grating detection system,and the embedded device is networked so as to receive the remote sensor test information so as to monitor the measured object.Based on the research of fiber grating temperature sensing and embedded data remote transmission in volume grating demodulation system,a detection and data transmission system is designed.This system has embedded Web service function,which can access data through browser and provide data.The long-distance transmission function has important practical value and application prospects.This paper designs an application architecture that combines fiber-optic-grating temperature demodulation systems with embedded Web services to enable remote data monitoring.For Ibsen's volume grating series I-MON80 D linear array detector demodulation module,STM32 was used as the main control chip to develop the fiber grating sensor drive circuit;meanwhile,the system uses ENC28J60 as the Ethernet controller,and the Lw IP protocol stack is transplanted in STM32 to achieve The embedded Web service function realizes the transmission and acquisition of sensor data on the Internet.The spectral data of the volume grating can be obtained through the browser.The USB interface is designed so that the computer can process the spectrum data in real time and calculate the measured ambient temperature.In this paper,the Gaussian fitting of the spectrum is performed using the least squares method to improve the accuracy of the peak position,thereby achieving accurate wavelength calibration.In this paper,Visual C++ is used to design the computer operation interface,and the spectrum diagram and the system test temperature obtained by the above-mentioned receiving and fitting processing through the USB interface are displayed to improve the interactivity.The scalability of this design is good.The hardware circuit of the system has an LCD interface.The LCD interface can be designed to provide users with more display modes.Through debugging and experimentation,the system can achieve the desired effect better: The temperature sensing experiment is used to obtain the relationship between temperature and center wavelength,and compared with a standard temperature test system to achieve temperature calibration.The system can be used in the temperature range of 0 °C ~ 70 °C test occasions,the system resolution is 0.026nm/?,the actual temperature and the test fitting temperature basically in line with the error of 0.313 °C This design has a small size,low power consumption,good stability,easy to carry and so on.