| As an important instrument for optical measurement,fiber optic spectrometer,micro optical power meter and handheld Raman spectrometer are widely used in industrial production and university research.The traditional data transmission methods include USB transmission and Bluetooth transmission.USB transmission can’t get rid of the limitation of transmission line;although Bluetooth is a wireless transmission method,it can only achieve point-to-point transmission,and the connection is not stable enough.With the introduction of the Internet plus concept and the development of the Internet of Things technology,new requirements have been put forward for the information exchange mode of traditional industries,and the development of optical measuring instruments has ushered in great challenges.Therefore,the introduction of Wi-Fi communication technology into traditional optical measuring instruments,the realization of networking and the formation of wireless sensor networks has a great practical significance.Author first investigates and analyzes the research status of the above three optical measuring instruments at home and abroad,and conducts theoretical research on Wi-Fi communication technology.According to the actual needs,a Wi-Fi module was selected.Based on this,the selected Wi-Fi module was debugged and developed,and the Wi-Fi module was used as the base station networking.And the simulation experiment is carried out on the development board based on STM32 chip,whichrealizes the docking and data interaction between the lower computer and the Wi-Fi module,and controls the Wi-Fi module to initialize,configure and network through the lower computer.At the same time,the network communication software based on UDP protocol was written on the host computer to realize the information interaction between the upper and lower machines.Through the experimental test,the feasibility of Wi-Fi communication and the accuracy of the data were verified,and the overall framework was built.Wi-Fi communication technology is being prepared for use in fiber optic spectrometers,micro-optical power meters,and handheld Raman spectrometers.On this basis,author redesigned the hardware circuit of the existing fiber optic spectrometer and added the Wi-Fi module.At the same time,the Wi-Fi module control program is implanted in the lower computer program,and the Wi-Fi module networking is controlled by the main control chip of the optical fiber spectrometer.A network communication program is embedded in the existing spectrum analysis software to receive data transmitted by Wi-Fi.The prototype was built for experimental test,and the mercury argon lamp and solar spectrum curves were collected.The test results show that the spectral data transmitted by Wi-Fi is basically consistent with the spectral data transmitted by USB.In addition,author designs a micro-optical power meter based on Wi-Fi communication.The micro-optical power meter uses thermopile detector to realize thermoelectric conversion.It can detect the wavelength range of 0.19 μm-15.0 μm and meet the 100 mW-100 W laser.Power measurement,and automatic range switching can be realized.The intensity of the laser is adjusted by PWM,and the measured laser power is transmitted to the host computer software through Wi-Fi.In order to verify its function,the designed prototype was tested.The test result was compared with the measured data of the standard optical power meter,and the error was within 2%.In addition,author builds a handheld Raman spectroscopy detection device based on the existing laser module,circuit system module(equipped with Wi-Fi module),external optical path module and micro spectrometer module independently developed by the research group..The Wi-Fi module control program is embedded in the circuitsystem module to complete the networking,and the spectral data is received through the designed network communication software.The Raman map of ice was collected using this principle machine,and compared with the theoretical Raman spectrum of methamphetamine,the main component of ice,the characteristic peaks of the two were basically consistent.The above research results show that the application of Wi-Fi technology in optical measuring instruments is successful,and the research work has greatly promoted the development of optical measuring instruments in conformity with the development of Industry 4.0. |
