研究目的
To describe and analyze an automated scanning device designed for measuring the bidirectional reflection function (BDRF) of samples with different degrees of surface roughness at specific laser wavelengths.
研究成果
The developed automated device effectively measures the bidirectional reflection function of samples with varying surface roughness at specified laser wavelengths, with a relative measurement error of 6–9%. Its design allows for flexibility in scanning parameters and the potential to extend its operational range into the middle and far IR ranges.
研究不足
The spectral range is limited to 0.35–1.1 μm due to the sensors' spectral sensitivity. The minimum angle of incidence is limited to 8°, and the maximum to 80° by the size of the laser spot on the sample.
1：Experimental Design and Method Selection:
The device is constructed as a two-coordinate goniophotometer for measuring BDRF. It includes a laser source, beam-splitting plate, mirrors, a sample, measuring and reference sensors, a rotating platform, and motorized shifting units for scanning.
2：Sample Selection and Data Sources:
Samples with different degrees of surface roughness are used. Data is collected through the measuring and reference sensors.
3：List of Experimental Equipment and Materials:
Includes PD300R-3W and PD300 photodiode power meters by OPHIR, NR360 and CR1-Z7 motorized shifting units, BSC202 and TDC001 controllers, and a personal computer for data processing.
4：Experimental Procedures and Operational Workflow:
The device scans the sample by moving the measuring sensor over a hemisphere above the sample, measuring the reflected radiation at each point. The process is automated with software on the LabVIEW platform.
5：Data Analysis Methods:
The bidirectional reflection function is integrated over the hemisphere to calculate the integral reflection coefficient. Measurement errors are calculated considering sensor errors, conversion factor errors, and shifting unit errors.
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