Scintillation is a highly discussed problem in laser atmospheric transmission, which plays an important role in improving the reliability and performance of laser communication systems. In this study, numerical simulations are conducted using a computational model to investigate the variation of the on-axis scintillation index of the focused platform beam during horizontal atmospheric propagation, considering different transmitter aperture sizes. The simulation results indicate that the aperture size significantly affects the scintillation index. Under the same Rytov variance conditions, larger aperture sizes lead to stronger scintillation effects. For smaller aperture sizes, the scintillation index maintains a relatively linear relationship with the Rytov variance. The findings of this study provide further insights into the factors influencing the scintillation characteristics in laser atmospheric transmission and offer valuable references for the design and engineering applications of laser communication systems.
KEYWORDS: Data acquisition, Data communications, Error control coding, Telecommunications, Windows, Data processing, Wireless communications, Design and modelling, Tunable filters, Power meters
In environments with harsh environments, high electromagnetic interference, and poor data channel quality, wireless laser power meters face the risk of data loss and data bit errors when measuring laser power. The wireless data transmission module works on a free channel using open standards, and is vulnerable to attacks, resulting in data leakage. In view of the above problems, this paper designs the communication data frame format of the PC end and the data acquisition module end for the wireless laser power meter data acquisition system. The TEA data encryption algorithm and the CRC check algorithm based on the look-up table method are added to the data frame. For the voltage noise and abnormal values collected by the data acquisition module, this paper uses a real-time low-pass filter algorithm to filter out high-frequency noise, and designs a sliding window algorithm to smooth the power curve and remove power abnormal values. The communication protocol and data processing algorithm designed in this paper realize the data verification, error retransmission and data encryption of the wireless laser power counting system, ensure the data reliability and data integrity during the data transmission process, and realize real-time noise reduction and power curve smoothing.
KEYWORDS: Data storage, Design and modelling, Databases, Ozone, Hydrogen, Photonic integrated circuits, Oxygen, Industrial chemicals, Internet of things, Industrial applications
In the scenario of online monitoring of underground water in-situ remediation system, where massive real-time monitoring data is produced in a high frequency, traditional relational database cannot efficiently manage data created by the monitored system. Focusing on such issue, this paper provides a monitoring solution based on time series database. On server side this system applies InfluxDB to accept data from device side. On device side, the system chooses Programmable Logic Controller (PLC) as main controlling unit. We also use Docker during deployment for easier maintaining. Experiments show that the system can manage and store massive real-time surveillance data. This design is of some significance in terms of real-time online monitoring for automatic and IoT systems.
Aiming at the problem that the arbitrary emission of wastewater from industrial enterprises, which has caused serious pollution of soil and groundwater in China, a set of intelligent control system for groundwater in-situ remediation equipment is designed in this paper. The system uses a programmable logic controller (PLC) as the main control unit, combined with pressure sensors, flow meters, ozone concentration detectors and other equipment, and uses injection well technology to achieve intelligent control of groundwater in-situ remediation equipment. In order to improve the performance of groundwater remediation, the injection module of the system can set a specific injection sequence and injection time for injection wells according to requirements. The system is of some significance for improving the automatic control level of groundwater treatment equipment.
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