Thermal infrared spectral band detection limits for unidentified surface materials
Thermal infrared spectral band detection limits for unidentified surface materials
复制标题
DOI：
10.1364/ao.40.004852
复制
发表时间：
2001-09-20
期刊：
影响因子：
1.9
通讯作者：
Salisbury, JW
中科院分区：
文献类型：
--
作者：
Kirkland, LE;Herr, KC;Salisbury, JW
通过机载或卫星光谱仪记录的红外发射光谱可以搜索光谱特征，以确定行星表面岩石的成分。表面材料通过特征光谱带的检测来识别。我们将展示如何定义是否接受所观察到的光谱特征作为检测时，目标材料是未知的。我们还使用遥感光谱测量的热发射光谱仪（TES）和空间增强型宽带阵列光谱仪系统来说明仪器参数和表面特性的重要性，波段检测限和如何在信噪比随波长的变化影响的波段，是最可检测的给定仪器。光谱仪的采样间隔、光谱分辨率、作为波长的函数的信噪比以及样品的表面性质影响仪器是否能够检测材料所表现出的光谱特征。例如，在6-13 μ m波长范围内，块状碳酸盐显示出两个谱带：一个非常强的，宽的特征，在6.5 μ m附近，一个不太强的，尖锐的谱带，在11.25 μ m附近。虽然6.5妈妈带更强，更广泛的实验室测量的光谱，11.25妈妈带将导致更多的TES光谱检测功能。(C)2001年美国光学学会。
Infrared emission spectra recorded by airborne or satellite spectrometers can be searched for spectral features to determine the composition of rocks on planetary surfaces. Surface materials are identified by detections of characteristic spectral bands. We show how to define whether to accept an observed spectral feature as a detection when the target material is unknown. We also use remotely sensed spectra measured by the Thermal Emission Spectrometer (TES) and the Spatially Enhanced Broadband Array Spectrograph System to illustrate the importance of instrument parameters and surface properties on band detection limits and how the variation in signal-to-noise ratio with wavelength affects the bands that are most detectable for a given instrument. The spectrometer's sampling interval, spectral resolution, signal-to-noise ratio as a function of wavelength, and the sample's surface properties influence whether the instrument can detect a spectral feature exhibited by a material. As an example, in the 6-13-mum wavelength region, massive carbonates exhibit two bands: a very strong, broad feature at similar to6.5 mum and a less intense, sharper band at similar to 11.25 mum. Although the 6.5-mum band is stronger and broader in laboratory-measured spectra, the 11.25-mum band will cause a more detectable feature in TES spectra. (C) 2001 Optical Society of America.