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高光谱分辨率激光雷达气溶胶类型识别系统

项目来源

国家重点研发计划(NKRD)

项目主持人

刘东

项目受资助机构

浙江大学

项目编号

2016YFC0200704

立项年度

2016

立项时间

未公开

项目级别

国家级

研究期限

未知 / 未知

受资助金额

101.00万元

学科

大气污染成因与控制技术研究

学科代码

未公开

基金类别

未公开

关键词

双波长激光雷达 ; 高光谱分辨率遥感 ; 干涉仪 ; 鉴频器 ; 反演 ; 气溶胶 ; Dual wavelength laser lidar ; High-spectral-resolution remote sensing ; Interferometer ; Discriminator ; Inversion ; Aerosol

参与者

刘崇；沈雪；王南朝；戎宇航

参与机构

未公开

项目标书摘要：高光谱分辨率激光雷达(HSRL)在观测与研究大气气溶胶方面有一定优势。但由于受到光谱鉴频器的限制，目前的HSRL只能探测得到大气气溶胶在紫外(如355 nm)和可见光波段(如532 nm)的光学参数，而在较长的近红外(如1064 nm)波段却未见报道。由于紫外和可见光在波长上比较接近，得到的气溶胶参数在大气气溶胶类型识别时信息量不足。本课题构建了基于视场展宽迈克尔逊干涉仪(FWMI)鉴频器的近红外HSRL以探测大气气溶胶在近红外波段的光学属性；同时利用碘分子鉴频技术研制532nm可见光波段的HSRL,从而实现近红外—可见双波长高光谱分辨率激光雷达系统。研制的双波长HSRL系统，经过系统参数定标，能实现准连续数据观测。该系统能高时空分辨率地精确探测大气气溶胶后向散射系数、消光系数、退偏比、光学厚度、谱退偏比、散射颜色比等综合光学参数，形成全方位的气溶胶“指纹”。并且实施了外场实验，实现多种气溶胶的观察，建立了双波段 HSRL 气溶胶光学属性实验数据库。

Application Abstract: High-spectral-resolution Lidar(HSRL)has certain advantages in the observation and study of atmospheric aerosols.However,due to the limitations of the spectral discriminator,the current HSRL can only detect the optical parameters of atmospheric aerosols in the ultraviolet band(such as 355 nm)and visible band(such as 532 nm),but it has not been reported in the long near infrared band(such as 532 nm).Since the ultraviolet and visible light are relatively close in wavelength,the obtained aerosol parameters are insufficient in the amount of information recognized by the atmospheric aerosol type.This subject constructs a near-infrared HSRL based on field-widened Michelson interferometer discriminator to detect the optical properties of atmospheric aerosols in the near-infrared band.Simultaneously using the iodine molecular frequency discrimination technology to develop the HSRL in the visible light band of 532nm,thereby realizing the near-infrared-visible dual-wavelength HSRL system.The dual-wavelength HSRL system developed can achieve quasi-continuous data observation after system parameter calibration.The system can accurately detect atmospheric aerosol backscattering coefficient,extinction coefficient,depolarization ratio,optical depth,spectral depolarization ratio,scattering color ratio and other comprehensive optical parameters with high spatial and temporal resolution to form a full range of aerosol"fingerprints".Furthermore,an external field experiment was carried out to observe various aerosol.A dual-band HSRL aerosol optical property experimental database was established.

项目受资助省

浙江省

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  • 1.Practical retrace error correction in non-null aspheric testing: A comparison

    • 关键词：
    • Interferometry;Error correction;Numerical methods;Wavefronts;Aspheres;Aspheric testing;Figure;Geometrical deviations;Interferograms;Research applications;Retrace errors;Reverse optimization
    • Shi, Tu;Liu, Dong;Zhou, Yuhao;Yan, Tianliang;Yang, Yongying;Zhang, Lei;Bai, Jian;Shen, Yibing;Miao, Liang;Huang, Wei
    • 《Optics Communications》
    • 2017年
    • 383卷
    • 期刊

    In non-null aspheric testing, retrace error forms the primary error source, making it hard to recognize the desired figure error from the aliasing interferograms. Careful retrace error correction is a must bearing on the testing results. Performance of three commonly employed methods in practical, i.e. the GDI (geometrical deviation based on interferometry) method, the TRW (theoretical reference wavefront) method and the ROR (reverse optimization reconstruction) method, are compared with numerical simulations and experiments. Dynamic range of these methods are sought out and the application is recommended. It is proposed that with aspherical reference wavefront, dynamic range can be further enlarged. Results show that the dynamic range of the GDI method is small while that of the TRW method can be enlarged with aspherical reference wavefront, and the ROR method achieves the largest dynamic range with highest accuracy. It is recommended that the GDI and TRW methods be applied to apertures with small figure error and small asphericity, and the ROR method for commercial and research applications calling for high accuracy and large dynamic range. © 2016 Elsevier B.V.

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  • 2.Frequency locking of a field-widened Michelson interferometer based on optimal multi-harmonics heterodyning

    • 关键词：
    • Optical radar;Heterodyning;Locks (fasteners);Natural frequencies;Spectral resolution;Harmonic analysis;Electro-optic phase;Frequency locking;Frequency ranges;Heterodyne signals;High spectral resolution lidars;Lock acquisition;Multiharmonic
    • Cheng, Zhongtao;Liu, Dong;Zhou, Yudi;Yang, Yongying;Luo, Jing;Zhang, Yupeng;Shen, Yibing;Liu, Chong;Bai, Jian;Wang, Kaiwei;Su, Lin;Yang, Liming
    • 《Optics Letters》
    • 2016年
    • 41卷
    • 17期
    • 期刊

    A general resonant frequency locking scheme for a field-widened Michelson interferometer (FWMI), which is intended as a spectral discriminator in a high-spectral-resolution lidar, is proposed based on optimal multi-harmonics heterodyning. By transferring the energy of a reference laser to multi-harmonics of different orders generated by optimal electro-optic phase modulation, the heterodyne signal of these multi-harmonics through the FWMI can reveal the resonant frequency drift of the interferometer very sensitively within a large frequency range. This approach can overcome the locking difficulty induced by the low finesse of the FWMI, thus contributing to excellent locking accuracy and lock acquisition range without any constraint on the interferometer itself. The theoretical and experimental results are presented to verify the performance of this scheme. © 2016 Optical Society of America.

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