本文選題：偏振　切入點(diǎn)：后向散射系數(shù)　出處：《光譜學(xué)與光譜分析》2016年01期 　論文類型：期刊論文

【摘要】：顆粒后向散射系數(shù)是水體主要的固有光學(xué)特性,也是海洋水色的決定因子和海洋水色衛(wèi)星遙感反演的基礎(chǔ)參數(shù)。當(dāng)前,利用光學(xué)儀器現(xiàn)場(chǎng)原位測(cè)量是獲取水體顆粒后向散射系數(shù)的主要方法。由于光源自身和儀器光路中鏡面反射和折射,其出射光源可能存在一定的偏振,進(jìn)而會(huì)影響水體后向散射系數(shù)測(cè)量的精度。目前,關(guān)于水體后向散射系數(shù)測(cè)量?jī)x器的光源偏振性及其對(duì)顆粒后散射系數(shù)測(cè)量精度影響的研究尚為空白。針對(duì)該問(wèn)題,以應(yīng)用廣泛的水體后向散射測(cè)量?jī)xHydroScat6(HS-6)為例,對(duì)其出射光源的偏振特性進(jìn)行了系統(tǒng)測(cè)量,并進(jìn)一步開(kāi)展了光源偏振對(duì)水體顆粒后向散射系數(shù)測(cè)量精度影響的實(shí)驗(yàn)研究。結(jié)果表明,HS-6六個(gè)光學(xué)通道除590nm通道出射光源偏振度略低外(~15%),其他通道出射光源中心波長(zhǎng)偏振度均在20%~30%。因此,HS-6出射光源具有顯著的偏振特性。光源偏振對(duì)顆粒后向散射系數(shù)測(cè)量具有不可忽略的影響,且影響程度隨著波段,線偏振角度及懸浮泥沙濃度而變化。不同懸浮泥沙濃度下,光源偏振引起的420,442,470,510,590和670nm六個(gè)波段的平均偏差可達(dá)15.49%,11.27%,12.79%,14.43%,13.76%,12.46%。因此,利用光學(xué)儀器現(xiàn)場(chǎng)測(cè)量顆粒后向散射系數(shù)需要考慮光源偏振的影響,并需盡可能降低出射光源的偏振度。
[Abstract]:The backscattering coefficient of particles is the main inherent optical property of water body, and also the determining factor of ocean water color and the basic parameter of remote sensing inversion of ocean water color satellite. In situ measurement with optical instruments is the main method to obtain backscattering coefficient of water particles. Due to the reflection and refraction of the mirror surface in the light source itself and in the instrument path, the light source may have some polarization. At present, the research on the polarization of light source and its influence on the measurement accuracy of backscattering coefficient of water body is still blank. Taking HydroScat6 HS-6, a widely used backscatter measuring instrument, as an example, the polarization characteristics of its outgoing light source are systematically measured. The experimental study on the effect of light source polarization on the measurement accuracy of backscattering coefficient of water body particles is carried out. The results show that the six optical channels of HS-6 except 590nm channel have a slightly lower degree of polarization of the outgoing light source, and other channels have the center of the outgoing light source. The polarization of the light source of HS-6 has remarkable polarization characteristics. The polarization of the light source has an important influence on the measurement of the backscattering coefficient of particles. And the influence degree varies with the band, linear polarization angle and suspended sediment concentration. Under different suspended sediment concentration, the average deviation caused by light source polarization in the six bands of 420,442,470,510,590 and 670 nm can reach 15.49. In order to measure the backscattering coefficient of particles in situ by optical instruments, the influence of polarization of light source should be considered, and the degree of polarization of light source should be reduced as much as possible.
【作者單位】： 衛(wèi)星海洋環(huán)境動(dòng)力學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室國(guó)家海洋局第二海洋研究所;遙感與智能信息系統(tǒng)研究中心中國(guó)科學(xué)院西安光學(xué)精密機(jī)械研究所;
【基金】：國(guó)家科技支撐計(jì)劃項(xiàng)目(2013BAD13B01) 國(guó)家(863計(jì)劃)課題(2014AA123301) 國(guó)家自然科學(xué)基金項(xiàng)目(41322039,41271378,41321004) 全球變化與海氣相互作用專項(xiàng)項(xiàng)目(GASI-03-03-01-01)資助
【分類號(hào)】：P715.7;O436.3

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