Automatic measurement of spectral bidirectional transmittance distribution function on translucent optical materials

• Published in: Measurement : journal of the International Measurement Confederation Vol. 69; pp. 126 - 133
• Main Authors: Wang, Hongyuan, Zheng, Xunjiang, Du, Weifeng
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.06.2015
• Subjects: Automatic measurement; Bidirectional transmittance distribution function (BTDF); Error analysis; Spectral and spatial transmission characteristics; Bidirectional transmittance distribution function (BTDF); Error analysis; Automatic measurement; Spectral and spatial transmission characteristics
• ISSN: 0263-2241; 1873-412X
• DOI: 10.1016/j.measurement.2015.03.029

•A measuring platform of spectral bidirectional transmittance distribution function is set.•Data acquisition and control software are integrated to realize automatic measurement.•The facility has a broad angle range, wide dynamic response and short collection time.•The measurement error is no more than 3.28%.•It provides a method for spectral and spatial transmission measurement. A measurement platform of spectral bidirectional transmittance distribution function (BTDF) with a full three dimensional spatial coverage is developed based on a fiber spectrometer, a tungsten–halogen lamp and a 3D mechanical rotation angle system. The measurement software and the control software are integrated to realize the automatic measurement. The measurement equipment has a broad spectral coverage, a large angle range, a wide dynamic response and a short acquisition time. The measured spectral range is 380–760nm with 0.04nm spectral resolution. The measured angle range is 0–80° in zenith angle and 0–360° in azimuth angle with 0.01° angle resolution. The dynamic range is 107 and the minimal integration time is 1ms. The measurement of spectral BTDF on translucent frosted glass is performed and a large amount of measured data is obtained with the measurement error no more than 3.28%. It provides a reliable description facility for spectral and spatial transmission characteristics of the translucent materials.