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Research Papers

# Spectral Characterization of PSI’s High-Flux Solar Simulator

[+] Author and Article Information
Ivo Alxneit1

Solar Technology Laboratory, Department General Energy,  Paul Scherrer Institute (PSI), CH-5232 Villigen PSI, Switzerlandivo.alxneit@psi.ch

Henri Schmit

Solar Technology Laboratory, Department General Energy,  Paul Scherrer Institute (PSI), CH-5232 Villigen PSI, Switzerlandivo.alxneit@psi.ch

1

Corresponding author.

J. Sol. Energy Eng 134(1), 011013 (Nov 29, 2011) (5 pages) doi:10.1115/1.4005249 History: Received April 04, 2011; Revised September 16, 2011; Published November 29, 2011; Online November 29, 2011

## Abstract

In this publication, the detailed spectral characterization of the concentrated radiation of PSI’s 50 kW xenon arc lamp based solar simulator (HFSS) is reported. Spectra are presented for the range of 350–1600 nm recorded at different radial distances from the position of maximum concentration, i.e., from the center of the spot. The analysis shows that the relative intensity of the short wavelength region decreases with increasing radial distance from the center of the spot. At the same time, the relative contribution of the xenon emission lines increases. All spectra can be decomposed into a broad background described by a blackbody spectrum with a temperature of T = 6000 ± 200 K and the characteristic line spectrum of xenon.

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## Figures

Figure 5

Comparison of vertical cross sections of flux distribution at the spot for one (top) and ten (bottom) lamps in operation. Solid lines are obtained from the flux measurement camera, while diamonds (◊) represent integrated intensities of measured spectra.

Figure 4

Spectra measured a different distances r from the center of the spot for a single lamp (#5) in operation

Figure 3

Flux distribution (MW m−2 ) on water-cooled reference target in the plane of the spot acquired by the camera based flux measurement system. All lamps in operation. Black diamonds identify positions where spectra were measured.

Figure 2

Schematic of the collection optics including the target: Water-cooled Al2 O3 -coated target (1), optical axis or HFSS (2), neutral density and optional cutoff filter (3), aperture (4), lens (5), optical fiber (6). The angle between the optical axis of HFSS (arrow) and the axis of the collection optics (dashed) is indicated.

Figure 1

Schematic of PSI’s HFSS: The array with ten lamp/reflector units is oriented to direct the radiation to the common secondary focus. The rectifiers and the cooling system are visible in the background. The motorized x-y-z translation stage can be seen with an experiment mounted and positioned at the common secondary focus of all reflectors.

Figure 6

Phenomenological decomposition of spectra (thin lines) into blackbody background (thick lines) with Xe emission lines superimposed. Residuals (Xe emission lines) are not shown in figure

Figure 7

Relative spectra as function of r normalized at 700 nm for one lamp in operation. Arrows point in direction of increasing r

Figure 8

Relative spectra as function of r normalized at 700 nm for all lamps in operation. Arrows point in direction of increasing r.

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