At present, the division of labor in the manufacture of lasers is becoming more and more refined, and some manufacturers specialize in the production of laser power supplies. In the field of laser power supply can be further divided into laser power supply and laser power supply control system, especially laser power supply control system often need to be personalized according to individual needs of manufacturers. However, the control interfaces of these laser power supplies are generally similar, and laser control systems can be developed according to these interface definitions. For these similar control interfaces, this paper designs a laser power control system based on STM32.The system carries STemWin to realize the human-computer interaction function, while the system uses RTOS to realize the integration of each software module. Based on the PWM signal generated by STM32, continuous analog control signal output with PWM amplified signal is realized through the driver board. The final result is an adjustable operating voltage of 0-1000V and an output frequency of 1-20Hz. And it is applied to the laser power supply, the working condition in the actual working environment is good, for the follow-up further optimization also laid a foundation.
In recent years, due to excessive levels of indoor air pollutants in teaching, there has been an increase in the number of cases of physical illness among primary and secondary school students, thus triggering key national concerns. Traditional air purification devices mainly purify air by means of filtration, they are single-functional and work independently, which makes it difficult to manage centrally. In order to protect students' physical and mental health and improve indoor air quality, a microcontroller-based intelligent control system for space disinfection is designed. The system adopts GD32 microcontroller as the main controller to realize filtration, purification and detection functions, and the air purification equipment connects to the IoT platform through 4G CAT1 chip and MQTT protocol to realize remote detection and control. The test shows that the system is reliable and stable in operation and simple in operation, the system has multi-sensor detection function and can accurately detect ozone, ammonia, formaldehyde, PM2.5, TVOC, carbon dioxide, temperature and humidity in indoor air. Therefore, the system can effectively improve indoor air quality, it solves the problem that the current equipment on the market works alone and has a single function and has a high practical use value.
KEYWORDS: Control systems, Telecommunications, Power supplies, Xenon, Lamps, Control systems design, Human-machine interfaces, Sensors, Data communications
In order to realize the visible, integrated, and intelligent control requirements of optimal pulsed light, an optimal pulsed light control system for dry eye treatment was designed based on ARM. The system adopts the double-layer structure of Android development platform + STM32 micro-controller, which realizes the isolation of human-computer interaction and component control, and enhances the application expansion function of the system. Relying on the PWM control signal generated by the high-speed clock integrated by the STM32 micro-controller, the output voltage can be continuously adjusted from 200 to 700V; Using the single pulse/pulse cluster signal can realize the precise control of the optimal pulsed light, the specific indicators are as follows: single/double/triple pulse output; sub-pulse width is 0.3, 0.5, and continuously adjustable from 1 to 5ms; sub-pulse interval is continuously adjustable from 1 to 99ms, and the step is 1ms; the frequency in single pulse mode is 0.5, and continuously adjustable from 1 to 10Hz. The system integrates a temperature and humidity module and a micro switch module to monitor the working environment and detect the ready state of the treatment handle in real time. The tests show that the system is reliable and stable in operation, which meets the requirements of control accuracy, and plays a pre-research role for the subsequent extensive application expansion of the instrument.
Due to the limitation of its crystal characteristics, Holmium laser cannot directly produce high-power laser output. This article uses the relationship between the pulse and angular displacement of the servo motor to design a three-light path flat-flat stable cavity structure, which is adjusted by the servo motor The direction of the light path, and then realize the combined beam output laser. The I/O port output pulse sequence is generated by STM32 real-time timing to control the initial position and speed of the servo motor driver. The three-hole mirror frame is driven by the rotation of the servo motor, and the slot-type optical coupler is used for positioning, and the laser resonant cavity of each channel works independently in turn by time division multiplexing, and finally realizes the combined laser beam output.
This paper demonstrates the laser performance of Er: YSGG (Er3 + doping concentration of 35at.%) Solid-state lasers pumped by xenon lamps. We use three different pulse repetition frequencies to investigate the laser output of the laser, and obtain laser outputs with maximum output energies of 224.2mJ (1Hz), 361mJ (at 5Hz), and 269mJ (10Hz). The slope efficiency is 2.166 ‰, 5.099 ‰, and 5.406 ‰, the corresponding average output power is 111.527mW, 812.025mW and 1038.813mW. In addition, the same equipment was used to explore the laser performance of Cr, Er: YSGG (Cr-doped 2%, Er-doped 30%) solid lasers for comparative analysis. It was found that the laser performance of the dual-doped laser was superior and the output efficiency was higher. Therefore, the Er: YSGG crystal laser can achieve excellent mid-infrared laser output, and the selection of appropriate sensitizing ions can enhance its laser performance
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