基于宽频带温度脉动仪的大气温度起伏谱测量

任鹏飞; 崔朝龙; 刘庆; 黄宏华

doi:10.11884/HPLPB201931.190048

基于宽频带温度脉动仪的大气温度起伏谱测量

doi: 10.11884/HPLPB201931.190048

任鹏飞^{1, 2,},
崔朝龙¹,
刘庆¹,
黄宏华^1, ,

1.
中国科学院安徽光学精密机械研究所中国科学院大气光学重点实验室, 合肥 230031
2.
中国科学技术大学研究生院科学岛分院, 合肥 230026

基金项目:

中国科学院战略性先导科技转型(A类) 基金项目 XDA17010104

详细信息

作者简介:
任鹏飞(1993-), 男, 硕士研究生, 主要从事对流湍流池的研制及实验研究, siwuxie1@mail.ustc.edu.cn

通讯作者:
黄宏华(1976-), 男, 研究员, 主要从事大气光学参数特性、湍流图像传输研究, hhhuang@aiofm.ac.cn

中图分类号: TN246
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- 被引次数: 0
出版历程
- 收稿日期: 2019-02-22
- 修回日期: 2019-04-14
- 刊出日期: 2019-08-15

Measurements of the spectrum of atmospheric temperature fluctuations based on broadband micro-temperature sensor

Ren Pengfei^{1, 2
,},
Cui Chaolong¹,
Liu Qing¹,
Huang Honghua^{1
, ,}

1.
Key Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
2.
Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China

摘要

摘要: 常用温度脉动仪测量湍流的频谱, 频谱范围多在20Hz以下, 无法呈现大气温度起伏的高频特征。介绍一种宽频带低噪声温度脉动仪的设计方法, 研制出相应的仪器, 并进行了真实大气温度起伏测量实验。结果表明, 大气温度起伏具有丰富的高频信息, 温度起伏功率谱在更宽的频率范围内存在幂率不变性, 部分温度谱在高频部分出现拐点, 以更陡的幂率下降, 湍流谱的形状以及拐点出现的位置和湍流强度有一定的关系。拓宽了温度起伏功率谱的研究范围, 为光波传输的理论研究和技术应用提供了高频湍流谱信息, 为非Kolmogorov湍流研究提供了测量手段。
- 温度脉动仪 /
- 宽频带 /
- 湍流 /
- 温度起伏
Abstract: The frequency spectrum of turbulence measured by common micro-temperature sensor is mostly below 20 Hz, which can not show the high frequency characteristics of atmospheric temperature fluctuation.This paper introduces the design of a broadband low noise micro-temperature sensor, the development of the corresponding instrument, and the real atmospheric temperature fluctuation measurement experiment.It is shown that the atmospheric temperature fluctuation has abundant high frequency information.The power spectrum of temperature fluctuation has power invariance in a wider frequency range.Some of the temperature spectrum has inflection points in the high frequency part, and decreases more steeply.The shape of the turbulence spectrum and the position of the inflection point are related to the turbulence intensity.This study broadens the research scope of temperature fluctuation power spectrum, provides high frequency turbulence spectrum information for theoretical research and technical application of light wave transmission, and provides measurements for non-Kolmogorov turbulence research.
- micro-temperature sensor /
- broadband /
- turbulence /
- temperature fluctuation

HTML全文

图 1 信号采集放大电路

Figure 1. Acquisition and amplification circuit

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图 2 微弱信号检测

Figure 2. Weak signal detection

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图 3 系统噪声

Figure 3. System noise

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图 4 不同湍流强度下的大气温度起伏谱

Figure 4. The spectra of atmospheric temperature fluctuations in different turbulences

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图 5 直径6 μm温度谱幂率统计(0.1~35 Hz)

Figure 5. Probability distributions of power law measurements with 6 μm tungsten wire

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图 6 高频部分有拐点的大气温度起伏谱

Figure 6. Atmospheric temperature fluctuation spectra with inflection point in high frequency

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表 1 钨丝参数(293 K, 2 m/s，10⁵ Pa)

Table 1. Parameters of tungsten wire(293 K, 2 m/s, 10⁵ Pa)

Re	Nu	h/(W·m^-2·K^-1)	M/ms	f_s/Hz	R/Ω	ρ₀/(Ω·mm²·m^-1)	d/μm
0.797	0.732	3 159.8	1.194	133.29	20	0.055	6

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表 2 6 μm直径的钨丝不同幂率温度谱出现的概率

Table 2. Probability distributions of power law measurement with 6 μm tungsten wire

power law k	probability/%
>-5/3+0.20	1.6
-5/3-0.20~-5/3+0.20	52.2
-5/3-0.20	46.2

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