1.3.3.1 Airborne imaging spectral data acquisition
The imaging spectral data used in this study come from two airborne imaging spectrometers. The imaging spectrum data was acquired using the second-generation airborne imaging spectrometer (HyMap) with high spectral resolution and high spatial resolution newly developed by Australia's HyVista Company. The domestic imaging spectrometer OMIS-I was used to acquire data in Zhaoyuan, Shandong. Table 1-3-1 shows the main technical performance parameters of HyMap and OMIS-I.
1.3.3.2 Rock ore spectral characteristic testing
The rock ore spectral testing and analysis will use the FR-Pro spectrometer developed by American Spectral Analysis Equipment Company (ASD) and the Institute of Geophysical Environment ( Infrared smart spectrometer developed by GER.
Table 1-3-1 Main technical parameters of HyMap and OMIS-I imaging spectrometers
1.3.3.2.1 ASD FR-Pro spectrometer
FR -Pro spectrometer adopts advanced absorption filter, standard built-in light gate and drift lock automatic calibration function. It has short sampling and scanning time, simple operation, powerful software package and standard 1m long standard optical fiber probe (the optical fiber can also be extended). Its main performance indicators are as follows: the operating wavelength range is 350 ~ 2500φ, for indoor and outdoor use, single optical path system; in the visible light and near-infrared bands, the spectral resolution is 3φ; in the short-wave infrared band, the spectral resolution is 10φ; The sampling interval is 1.4φ for the 350 to 1050φ section and 2φ for the 1000 to 2500φ section; the dispersion element includes a fixed two rapidly rotating holographic reflection gratings, detectors Si (512 array) and InGaAs (2 pieces). The detector response Linearity is ±1%, PE cooling constant temperature; field of view (FOV) is 1°, 3°, 5°, 8°, 10°, 25° optional; test time is less than 0.5s; data access is computer hard disk; The quantified value is 16 bits; the test accuracy is 3% (visible light, near-infrared reflectance) and 5% (short-wave infrared); the wavelength accuracy is ±1φ.
1.3.3.2.2 GER-IRIS-Ⅲ type infrared intelligent spectrometer
The spectrum tester is the GER-IRIS-Ⅲ type infrared spectrometer equipped in the laboratory of China Land and Resources Aerophysical Exploration and Remote Sensing Center. Smart spectrometer. The instrument has a dual optical path system, and the target features and standard reference plate can be measured simultaneously. Its basic performance indicators are: spectral range is 0.40~2.50μm (visible light, near infrared and short-wave infrared); bandwidth is 2~4φ; channel number is 800; total field of view is 6°; spectral resolution visible light is 2φ, near infrared to short-wave infrared is 4φ; the flicker values ??of grating characteristics are 500, 1200, and 2200φ; the scanning range is 400 to 790φ, 750 to 1800φ, and 1750 to 2500φ; the standard reference board is a polytetrafluoroethylene standard white board.
1.3.3.3 Sample identification and analysis
In order to cooperate with the research and analysis of the spectral characteristics of rocks and minerals, especially the correlation analysis between the spectral characteristics of rocks and minerals and the temperature of origin and the verification analysis of rock or mineral identification, This sample identification and analysis test will use experimental analysis methods such as high-temperature experiments on rock and mineral samples, sample rock and mineral identification and chemical analysis.