主要赋铀岩石可见光—短波红外光谱二向性特征初步实验研究
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摘要
花岗岩和砂岩是我国主要的赋铀岩石,为了提高利用遥感图像识别这两种岩石精度的效果,开展其可见光—短波红外光谱二向性特征实验研究。对其在微光实验室中,用200 W钨灯与平行光管产生平行光,以15°、 30°和45°入射角照射岩石的自然表面,在距离岩石表面20(25)cm、30 cm和40 cm处用ASD光谱仪垂直岩石表面接收可见光—短波红外反射光谱。光谱测试和数据分析发现,岩石的反射光谱二向性特征明显受岩石结构的影响。全晶质的斑状花岗岩,其二向性特征只受岩石结构类型影响;粗粒和细粒花岗岩都是在光线以30°角入射时具有最大的反射率辐射。非全晶质的砂岩,其二向性特征受岩石结构和结晶颗粒大小的双重影响;粗砂岩在照射光45°角入射时具有最大的反射辐射,而细砂岩则在照射光15°角入射时,具有最强的反射辐射。
Granite and sandstone are the main uranium host rocks in China. The study on their bidirectional feature of reflectance spectra will help us improving the identification precision of the rocks by remote sensing method. In low light laboratory, tungsten light and collimator was used to produce parallel light to illuminate the rock surface, ASD field Pro spectrometer was used to receive the VNIR-SWIR reflectance at the perpendicular direction at the distance of 20(25)cm、 30 cm and 40 cm while the illuminating light with the incidence angle of 15°, 30° and 45°. Analysis of the detected spectra of the natural surface of rocks indicated that the bidirectional feature of rock spectra was affected obliviously by the rock texture. The bidirectional feature of the fully crystallized porphyritic granite was controlled by the rock texture and get the greatest reflectance when the illuminating light at the incidence angle of 30°. The bidirectional feature of the partly crystallized sandstone was controlled by both the rock texture and grain size of the mineral, the coarse grain sandstone produced the greatest reflectance when the illuminating light at the incidence angle of45°, while the fine grain sandstone produced the greatest reflectance when the illuminating light at the incidence angle of 15°.
Granite and sandstone are the main uranium host rocks in China. The study on their bidirectional feature of reflectance spectra will help us improving the identification precision of the rocks by remote sensing method. In low light laboratory, tungsten light and collimator was used to produce parallel light to illuminate the rock surface, ASD field Pro spectrometer was used to receive the VNIR-SWIR reflectance at the perpendicular direction at the distance of 20(25)cm、 30 cm and 40 cm while the illuminating light with the incidence angle of 15°, 30° and 45°. Analysis of the detected spectra of the natural surface of rocks indicated that the bidirectional feature of rock spectra was affected obliviously by the rock texture. The bidirectional feature of the fully crystallized porphyritic granite was controlled by the rock texture and get the greatest reflectance when the illuminating light at the incidence angle of 30°. The bidirectional feature of the partly crystallized sandstone was controlled by both the rock texture and grain size of the mineral, the coarse grain sandstone produced the greatest reflectance when the illuminating light at the incidence angle of45°, while the fine grain sandstone produced the greatest reflectance when the illuminating light at the incidence angle of 15°.
引文
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[2]Hapke B, Wells E. Bidirectional reflectance spectroscopy:2. Experiments and observations[J].Journal of Geophysical Research, 1981, 86(B4):3055-3060.
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[4]Li Chen, Xiucheng Yang, Guangwei Zhen.Potential of Sentinel-2 data for alteration extraction in coal-bed methane reservoirs[J]. Ore Geology Reviews, 2017.
[5]张棕贵.成像光谱岩矿识别方法技术研究和影响因素分析[J].国土资源遥感, 2004, 72(4):72-73.
[6]潘蔚,冯平.深圳市航空成像光谱试验及示范应用[R].北京:核工业北京地质研究院, 2005.
[7]Hapke B. Bidirectional reflectance spectroscopy:3.Correction for macroscopic roughness[J]. Icarus,1984, 59(1):41-59.
[8]Hapke B.Bidirectional reflectance spectroscopy:4.The Extinction coefficient and the opposition effect[J]. Icarus, 1989, 67(2):264-280.
[9]Hapke B.Bidirectional Reflectance Spectroscopy:5.The Coherent Backscatter Opposition Effect and Anisotropic Scattering[J]. Icarus, 2002, 157(2):523-534.
[10]Hapke B.Bidirectional reflectance spectroscopy:6.Effects of porosity[J]. Icarus, 2008, 195(2):918-926.
[11]赵永光,李传荣,马灵玲,等.一种遥感图像太阳—观测几何归一化方法[J].遥感技术与应用,2016, 31(2):260-266.
[12]Nicodemus F E. Geometrical Considerations and Nomenclature for Reflectance[J].Monograph,1977, 160:1-52.
[13]Gatebe C K, King M D. Airborne spectral BRDF of various surface types(ocean, vegetation, snow,desert, wetlands, cloud decks, smoke layers)for remote sensing applications[J]. Remote Sensing of Environment, 2016, 179:131-148.
[14]李小文.地物的二向性反射与方向谱特征[J].环境遥感, 1989, 4(1):67-72.
[15]周烨,柳钦火,刘强.两种BRDF室外测量方法的RGM模拟对比与误差分析[J].遥感学报,2008, 12(4):568-578.
[16]路鹏,陈圣波,崔腾飞,等.月球表面矿物二向性反射特性实验研究[J].岩石学报, 2016, 32(1):107-112.
[17]赵乃卓,赵云升,晏磊,等.花岗岩表面二向性镜面反射分量和漫反射分量的比较研究[J].红外与毫米波学报, 2007, 26(4):284-288.
[2]Hapke B, Wells E. Bidirectional reflectance spectroscopy:2. Experiments and observations[J].Journal of Geophysical Research, 1981, 86(B4):3055-3060.
[3]Meer F D V D, Werff H M A V D, Ruitenbeek F J A V, et al. Multi-and hyperspectral geologic remote sensing:A review[J]. International Journal of Applied Earth Observation&Geoinformation,2012, 14(1):112-128.
[4]Li Chen, Xiucheng Yang, Guangwei Zhen.Potential of Sentinel-2 data for alteration extraction in coal-bed methane reservoirs[J]. Ore Geology Reviews, 2017.
[5]张棕贵.成像光谱岩矿识别方法技术研究和影响因素分析[J].国土资源遥感, 2004, 72(4):72-73.
[6]潘蔚,冯平.深圳市航空成像光谱试验及示范应用[R].北京:核工业北京地质研究院, 2005.
[7]Hapke B. Bidirectional reflectance spectroscopy:3.Correction for macroscopic roughness[J]. Icarus,1984, 59(1):41-59.
[8]Hapke B.Bidirectional reflectance spectroscopy:4.The Extinction coefficient and the opposition effect[J]. Icarus, 1989, 67(2):264-280.
[9]Hapke B.Bidirectional Reflectance Spectroscopy:5.The Coherent Backscatter Opposition Effect and Anisotropic Scattering[J]. Icarus, 2002, 157(2):523-534.
[10]Hapke B.Bidirectional reflectance spectroscopy:6.Effects of porosity[J]. Icarus, 2008, 195(2):918-926.
[11]赵永光,李传荣,马灵玲,等.一种遥感图像太阳—观测几何归一化方法[J].遥感技术与应用,2016, 31(2):260-266.
[12]Nicodemus F E. Geometrical Considerations and Nomenclature for Reflectance[J].Monograph,1977, 160:1-52.
[13]Gatebe C K, King M D. Airborne spectral BRDF of various surface types(ocean, vegetation, snow,desert, wetlands, cloud decks, smoke layers)for remote sensing applications[J]. Remote Sensing of Environment, 2016, 179:131-148.
[14]李小文.地物的二向性反射与方向谱特征[J].环境遥感, 1989, 4(1):67-72.
[15]周烨,柳钦火,刘强.两种BRDF室外测量方法的RGM模拟对比与误差分析[J].遥感学报,2008, 12(4):568-578.
[16]路鹏,陈圣波,崔腾飞,等.月球表面矿物二向性反射特性实验研究[J].岩石学报, 2016, 32(1):107-112.
[17]赵乃卓,赵云升,晏磊,等.花岗岩表面二向性镜面反射分量和漫反射分量的比较研究[J].红外与毫米波学报, 2007, 26(4):284-288.