Research On System Of Bluetooth Miniature Laser Spectrometer Based On ARM

Traditional spectrometers usually use PC to collect and process spectral data,which has the disadvantages of large volume,high cost and complicated operation.In this thesis,the embedded processor is used as the data acquisition and processing system of spectrometer.Therefore,the real-time performance of spectrum detection is effectively improved,and the system has a great application prospect.The main contents of this thesis are as follows:In this thesis,based on the extensive investigation of the research status of spectrometer at home and abroad,the shortcomings of the data acquisition and processing system of spectrometer are analyzed.Based on the analysis of the principle of spectrometer,a miniature laser fluorescence spectrometer is developed adopting ARM-Cortex-M7 embedded processor as the core device of spectral data acquisition and processing.The hardware system of spectrometer mainly includes five parts: data acquisition and processing system,power supply system,data communication system,laser emission system and detection system.The data acquisition system uses ARM processor as the core of spectral data acquisition and processing,and achieves high-speed acquisition,processing and transmission of spectral data.The power supply system adopts linear step-down and step-up integrated IC chip to supply power to each module.The system uses linear step-down and step-up integrated IC chips to supply power to each module.The output ripple coefficient is small and the precision is high,which reduces the use of peripheral filtering circuit and greatly reduces the BOM cost.The data communication system uses Bluetooth communication to communicate with the mobile terminal,sending spectral data and receiving commands from the mobile terminal.The mobile application program parses the spectral data,draws and displays the spectral curve,and sets the working mode of the spectrometer by sending commands.The laser emission system controls the laser to excite the sample to be tested,and can achieve both continuous and pulse modes of operation.The detection system respectively adopts the area array digital CMOS imaging detector and the area array analog CCD imaging detector,and integrates the digital detector spectrometer and the analog detector spectrometer.The two sets of spectrometers can meet different application requirements.After completing the design of the hardware system,the software design of the spectrometer system is carried out.And the three working modes is realized.Through the design of the software,the acquisition,storage,processing and transmission of spectral image data is realized.After completing the integration of the spectrometer,the related experiment is carried out.The continuous light source is used to calibrate the spectrometer,and the calibrated spectrometer is used to detect the spectrum of the test sample.The experimental study proves that the designed spectrometer has high stability and the wavelength detection error is kept in a small range.Experiments show that the designed spectrometer has high stability and the detection error of wavelength is kept in a small range.The spectrometer can complete the fluorescence spectrum detection of a variety of substances.The miniature laser fluorescence spectrometer designed in this thesis has the advantages of low power consumption,small volume,high real-time performance and low cost and realizes the integration of spectral data acquisition and processing.With the help of the Internet of things technology,it is possible to layout and test spectrometers in a wide range,facilitating the popularization of civil application.