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Genesis CX-5500 Fluorescence Spectrometer for Rock and Mineral Measurement
Release time: 2019-11-22 09:28:47 Click: 1149
The CX-5500 spectrometer of Chuangxiang Company was selected for rock and mineral spectrum measurement in the field. Au 靶材， W 靶材， Rh 靶材等等，管压和管留可以自由调节。 The excitation light source of the spectrometer can be selected, Ag target, Au target, W target, Rh target, etc. The tube pressure and tube retention can be freely adjusted. The main features of the instrument are high spectral resolution, short sampling time, good repeatability, strong battery life, easy to carry, and easy to operate. It can make preliminary judgments of spectral data at the work site and is beneficial to field operations.
, 应该按照地物光谱测量的流程和精度控制要求来进行测量。 In order to obtain reliable and accurate measurement data for later database construction and spectral inversion , the measurement should be performed in accordance with the flow and accuracy control requirements of the ground feature spectrum measurement.
Field spectrum measurement method and workflow
Survey target selection In the survey area, the structural structure in each lithological section of the stratigraphic unit should be selected, and the rock with better exposure conditions should be selected as the survey target. Select a typical ore deposit in the survey area to perform spectral measurement for the alteration zone. “φ字型”方法选择典型矿点进行蚀变矿物的光谱剖面测量，剖面布设垂直于矿体的走向，沿线采集不同蚀变类型的光谱曲线。 The "φ-shaped" method is used to select typical ore spots for spectral profile measurement of altered minerals. The profile is arranged perpendicular to the trend of the ore body, and spectral curves of different alteration types are collected along the line.
: Measurements require visibility :
10km 。 The horizontal visibility when measuring in this area is not less than 10km .
, 且测量过程中 ，云的漂移不会对太阳辐照度造成影响。 Limitation of cloud cover: Clouds in the measurement area are not obstructed by sunlight , and cloud drift will not affect the solar irradiance during the measurement .
: 结合测区特点 ， 野外测量时风力应小于 4 级。 Wind requirements : Combined with the characteristics of the measurement area , the wind force in the field measurement should be less than level 4 .
45 度。 Solar zenith angle: The zenith angle within the measurement time should be less than 45 degrees.
Dress code: In order to prevent light pollution, wear dark-colored clothes. Do not wear white or bright reflective clothes.
10:00 到 16:00 之间进行测量 ，确保光照充足，岩石表面无凝结水或附着水影响。 The measurement method and work flow are measured between 10:00 and 16:00 local time in the measurement area to ensure that the light is sufficient and the surface of the rock is not affected by condensation or adhering water. 100% 的基线 ，然后对着目标地物测量，为使所测数据能与卫星传感器所获得的数据进行比较，测量仪器探头垂直于目标地物。 Before each kind of feature spectrum measurement, the reference plate is calibrated and calibrated to get a baseline close to 100%, and then the target feature is measured. In order to compare the measured data with the data obtained by the satellite sensor, the measuring instrument probe Normal to the target figure.
Method for rock and mineral measurement by fluorescence spectrometer
Considerations for Precision Control Probe Selection
, 选择合适的探头至关重要。 The spectral curve obtained from the rock and mineral spectrum measurement is the comprehensive spectrum of the rock . The mineral distribution and combination within the scope of the probe's field of view must be sufficiently representative . It is important to choose the appropriate probe. ，观测距离较近时， 应选取较大视场角的探头进行测量。 When the range of target features is large and the observation distance is short, a probe with a larger field of view angle should be selected for measurement. 5 °的探头进行野外岩矿光谱测量。 This time, a probe with a field angle of 5 ° was used for field rock and mineral spectrum measurement.
± 10 °之内 ，保证进行白板校正时，探头视域充满整个参考板， 根据公式一计算得到仪器测量高度为 135cm， 保持这一高度进行测量以便获取平均光谱。 During field surveys, the surveyor keeps the probe perpendicular to the measured object, at least within ± 10 ° from the normal to the horizontal plane. When the white calibration is performed, the probe's field of view is filled with the entire reference plate and calculated according to formula 1. The instrument was measured at a height of 135 cm, and this height was measured to obtain an average spectrum. , 仪器无法进行原位测量 ，先进行标本采集， 标本大小标准为 3 × 6 × 9cm ，再直接对标本进行测量，为确保探头视域充满整个样品， 根据公式二计算得到的测量高度为 65cm 。 For special circumstances , the instrument cannot perform in-situ measurement . First collect the specimen, the standard size of the specimen is 3 × 6 × 9cm , and then directly measure the specimen. To ensure that the probe's field of view is filled with the entire sample, the measurement height calculated according to formula two It is 65cm . : 每次测量之前应进行参考板的反射校正 ， 采用仪器标配的白板进行校正。 Whiteboard reflection correction : Before each measurement, the reflection correction of the reference plate should be performed , and the whiteboard standard with the instrument is used for correction. 10 分钟 ，防止传感器响应系统的漂移和太阳入射角的变化影响。 And ensure that each measurement time does not exceed 10 minutes to prevent the sensor response system from drifting and the influence of the change in the incident angle of the sun. Avoid shadows: Surveyors should stand facing the sun to avoid their own shadows from falling on the target, and there should be auxiliary information records of field rock spectrum measurement during measurement.
20 条数据 ，以求平均值，降低噪声和随机性。 At each measurement point, 20 pieces of data are measured on the weathered surface and the fresh surface to find the average value and reduce noise and randomness.
Record auxiliary data
( 度 ) 、单个采样点的位置描述、海拔高度 ( 米 ); After each measurement is completed, the related auxiliary data that needs to be recorded for measurement mainly includes the following seven aspects of information: measurement point position information, latitude and longitude ( degrees ) , position description of a single sampling point, and altitude ( meters );
Field geological description
Including the description of the geological properties of the location of the observation point, rock color, structure, mineral composition and content estimation, and major altered minerals;
GPS, 时间和地点用于确定每一次光谱测量的太阳天顶角 ; 测量时刻的天空状况 : 包括云的类型 ( 按照世界气象组织 WMO 的有关云种类 ) 、云覆盖的范围、太阳是否被遮蔽 ; With field survey GPS, time and place are used to determine the solar zenith angle of each spectral measurement ; the sky condition at the time of measurement : includes the type of cloud ( according to the relevant cloud types of the World Meteorological Organization WMO ) , the area covered by the cloud, the sun Whether it is obscured ;
( ℃ ) 、相对湿度 (%) 、表面大气压 (kPa) 、平均风速及其变化 ( 阵风 ); Including air temperature ( ℃ ) , relative humidity (%) , surface atmospheric pressure (kPa) , average wind speed and its change ( gust );
( 度 ) 、光谱采样间隔 ; Including the angle of view ( degrees ) measured by the instrument and the spectral sampling interval ;
Field measurement technology
, 序列号 , 及其校正日期、传感器距离地面高度 ( 厘米 ) 、传感器距离测量表面高度等信息并配以野外照相记录 , 便于测区的典型岩矿光谱数据库的建立及波谱反演工作开展。 Includes the type of reference plate , serial number , and its correction date, sensor height from the ground ( cm ) , sensor distance measurement surface height, etc., and field photography records , which is convenient for the establishment of a typical rock and mineral spectrum database in the survey area and the spectral reflection Performed work.