Comparing to the big-size scanning spectroradiometer, the compact and convenient fiber spectroradiometer is widely
used in various kinds of fields, such as the remote sensing, aerospace monitoring, and solar irradiance measurement.
High accuracy calibration should be made before the use, which involves the wavelength accuracy, the background
environment noise, the nonlinear effect, the bandwidth, the stray light and et al. The wavelength lamp and tungsten lamp
are frequently used to calibration the fiber spectroradiometer. The wavelength difference can be easily reduced through
the software or calculation. However, the nonlinear effect and the bandwidth always can affect the measurement
accuracy significantly.
We validate the S-S method and the differential operator method through numerical simulations and experiments.
Using a LED with a bandwidth of about 10nm as light source, we measure the spectral irradiance of the LED
when the spectroradiometer bandwidth is 1nm and 5nm. The S-S method and the differential operator method
act on experimental results to identify the efficiency of the methods. Through our analysis, the correction
methods play significant roles in the spectral irradiance measurement. Especially, the correction methods are
necessary when the light source has a narrow bandwidth feature.
Lamps and lamp system are widely used in large quantities in an era. The evaluation and control of optical radiation hazards of lamps and lamp systems is far more complicated. A special measurement and traceability facility was set up at NIM (National Institute of Metrology, China) to evaluate the optical radiation safety of lamp and lamp system, which includes a double grating spectroradiometer OL750D with two different entrance systems of spectral radiance and spectral irradiance traceable to the national primary standard of spectral irradiance by a 1000W spectral irradiance standard lamp, 40W deuterium lamp and a standard diffuser plate. The technical requirements of the measurement instrumentation used for optical radiation safety evaluation including monochromator type, wavelength accuracy, input optics, spectral scan interval and calibration sources are recommended also in this paper. Spectral radiance of a series of LED electric torches and infrared sources were measured by using the new developed system, and potential radiation hazards of retinal blue light hazard and retinal thermal hazard are calculated and evaluated. The optical radiation hazards of some samples are listed in Risk Group 2 (Moderate-Risk).
To reduce the uncertainty of dissemination, the models for standard lamp of spectral irradiance data are presented. We propose a divide-and-conquer RBF neural network approach in which the spectral irradiance is divided into two subsets, and each subset is modeled with a different network. The results show that the RBF neural network model produces well generalizations while the Planck-polynomial model produces poor ones. During the generalizations, the maximum relative deviation of the RBF neural network model and the Planck-polynomial model were 0.027% and 3.46%, respectively.
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