Instrumental nonlinearity in the measurement of diffuse reflectance using an integrating sphere
A sphere of 235 mm internal diameter with one sample port has been commissioned for use in the measurement of diffuse reflectance. The instrumental nonlinearrty in the measurement procedure using this sphere has been tested with a set of eight artefacts of nominal reflectances 0.99 (3 of), 0.8,0.4,0.2, 0.1, and 0.05 that were calibrated at NIST. These measurements have been repeated on 3 occasions over eighteen months. Analysis of these measurements shows an instrumental nonlinearity whose magnitude amounts to two to three times the standard deviation in measurements on artefacts of reflectance less than 0.4. The formalism used for estimating uncertainty in the calibration of working standards against the set of three NIST-calibrated artefacts of 0.99 reflectance is described.
J.F.Clare J.D. Hamlin
Measurement Standards Laboratory of New Zealand, IRL, Lower Hutt, New Zealand
国际会议
26th Session of the CIE(国际照明委员会（CIE）第26届大会)
北京
英文
339-342
2007-07-04（万方平台首次上网日期，不代表论文的发表时间）