Temperature control method of CO2laser operating in airborne wide temperature range
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摘要:
机载 雷达是实现远距离大气精准监测的重要手段，CO2 器工作谱段与部分大气污染物和化学物质吸收谱一致，是大气监测 雷达的重要光源。面向机载要求，在控制体积重量的条件下实现−40 °C~55 °C宽温域工作是机载CO2 器温控系统的设计难点。因此，本文提出一种以 器性能和环境温度为设计输入，半导体热电制冷与强制风冷相结合的闭环温控方法。根据 器、半导体热电制冷和强制风冷等的结构与传热特性，建立温控方法的有限元模型，基于此模型对 器温控性能进行研究。对于55 °C高温环境，温控系统工作25 min后， 器温度控制在40 °C；对于−40 °C低温环境，温控系统在工作20 min后， 器温度控制在25 °C，满足 器正常工作要求。根据 器及建立的温控方法，开展高低温环境下 器工作能力实验研究，采集实验过程中的 器温度数据，测量高低温条件下 输出能力。实验结果表明：实测 器温度与有限元仿真温度数据基本吻合，两者误差小于10%；采用所提出的温控方法， 器在高低温条件下可以正常工作，输出功率与室温条件下一致。
Abstract:Airborne lidar is an important means to achieve long-range accurate atmospheric monitoring. Its laser wavelength is consistent with the absorption spectrum of most atmospheric pollutants and chemical substances, which makes it an important laser source for airborne lidar. However, it is difficult to design a temperature control system for airborne CO2lasers to work in the −40 °C−55 °C temperature range under the controlled volume and weight conditions. In this paper, we propose a temperature closed-loop control method, in which the laser characteristic and environment temperature are used as input, and a thermo electric cooler and forced air cooling are combined. According to the structure and heat transfer characteristics of the laser, the thermo-electric cooler and the level of forced air cooling, the finite element model of temperature control method is established to optimize the temperature control performance of the laser. In a high temperature environment of 55 °C, the temperature of the laser is controlled at 40 °C after the temperature control system operates for 25 min. In a low temperature environment of −40 °C, the laser temperature is controlled at 25 °C after the temperature control system operates for 20 minutes, which meets the normal working requirements of the laser. According to the laser and the established temperature control method, the experimental research on the working ability of the laser in high and low temperature environment is carried out, the temperature data of the laser in the experimental process is collected, and the laser output power is measured under high and low temperature conditions. The experimental results show that the experimental measured temperature data is consistent with the finite element simulation results and the error between them is less than 10%. The laser using the proposed temperature control method can work steadily, and the output power of the laser is consistent with that of the laser at room temperature.
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图 5散热翅片间距为5 mm时，不同转速风扇形成的对流换热区域温度分布
Figure 5.Temperature distributions of convection heat transfer region formed by fans at different rotate speeds when the cooling fin spacing is 5 mm
图 6散热翅片间距为3 mm时，不同转速风扇形成的对流换热区域温度分布
Figure 6.Temperature distributions of convection heat transfer region formed by fans at different rotate speeds when the cooling fin spacing is 3 mm
图 7高温环境下，基于温控制冷的 器温度分布
Figure 7.Temperature distribution of laser based on temperature control cooling in high temperature environment
图 8高温环境下， 器表面监测点温度随时间变化
Figure 8.Temperature of the monitoring point on the laser surface changing with time in high temperature environment
图 9低温环境下，基于温控加热的 器温度分布
Figure 9.Temperature distribution of laser based on temperature control heating in low temperature environment
图 10低温环境下， 器表面监测点温度随时间变化
Figure 10.Temperature of the monitoring point on the laser surface changing with time in low temperature environment
图 12高温环境下实验测量温度数据与仿真结果对比
Figure 12.Comparison of the measured temperature and the simulation data in high temperature environment
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