Realization of a filter radiometer-based irradiance scale with high accuracy in the region from 286 nm to 901 nm

Abstract

A technique is introduced for realizing spectral irradiance in the range between 286 nm and 901 nm. The scale is based on a temperature-controlled filter radiometer constructed from a three-element silicon trap detector, band-pass filters and a precision aperture. Seasoned FEL-type quartz halogen lamps are used as reference standards. In this method, direct traceability of the radiometer to the cryogenic radiometer gives an important advantage in the visible and near-infrared regions. Another advantage of this system is the procedure followed for measurement of the distance between the lamp filament and aperture surface of the filter radiometer. The expanded uncertainty (k = 2) of the spectral irradiance measurement is between 2.3% and 1.5% in the UV region, while the uncertainty is of the order of 0.6% above 400 nm.

High Accuracy Calibration Technology of UV Standard Detector

“…Uncertainty source Value The HAUVSR self-responsivity uncertainty 1.3% The testing error of the distance between the lamp and the instrument 1.2% The uncertainty generated by the instrument position deviation 0.5% The wavelength accuracy and repeatability of the untested spectrometer 0.6% The detecting system excursion and linearly of the untested spectrometer 0.5% The stray light uncertainty 0.3% Total uncertainty 1.9 % (19),the uncertainty can be calculated. The value is 1.2% 3.…”

New traceability chains in the photometric and radiometric measurements at the National Metrology Institute of Turkey

“…Temperature-controlled home-made filter radiometers are used in order to realize spectral irradiance scale from 290 to 900 nm [10]. Each filter radiometer consists of three element silicon trap detector, changeable interference filters and precision aperture.…”

“…Then using appropriate fit function spectral irradiances of lamp between 290 and 900 nm, wavelength ranges are calculated [10]. Three pieces of 1000 W FEL-type lamps are aged and calibrated as irradiance standards, which have closeness of irradiance distribution shape to the blackbody radiator.…”

“…Three pieces of 1000 W FEL-type lamps are aged and calibrated as irradiance standards, which have closeness of irradiance distribution shape to the blackbody radiator. The spectral irradiance values of lamps between mentioned wavelength ranges are measured at the distance of 500 mm with expanded uncertainties between 2.3% (k ¼ 2) and 0.6% (k ¼ 2) [10]. In the visible and near-infrared regions, the expanded standard uncertainty (k ¼ 2) varies between 0.7% and 0.6%.…”

Portable traceability solution for ground-based calibration of optical instruments

“…A scanning monochromator, as typically used with an ESCR, is to slow and bulky for a portable system. An alternative is to use a series of narrow band-pass filters to build a filter radiometer [7][8][9][10][11]. A filter radiometer measures the integrated spectral irradiance in a series of narrow bands.…”