NOW Catalog - Atlas Material Testing Technology - #50

EMMAQUA employs 10 highly-reflective mirrors and a sun-tracking system to concentrate sunlight onto test specimens. The result is natural weathering testing in a fraction of the time. In addition, you get the closest correlation to end-use conditions because samples are exposed to the full spectrum of natural sunlight.

DSET Laboratories pioneered the development

of the EMMAQUA outdoor accelerated test methods

in the early sixties. The method employs Fresnel reflecting

solar concentrators that use ten flat mirrors to uniformly focus

natural sunlight onto specimens mounted in the target plane.

High quality, first-surface mirrors provide an intensity of

approximately eight "total suns" with the spectral balance

of natural sunlight in terms of ultraviolet integrity.

The target board, located at the focal line of the mirrors, lies along a wind tunnel along which a deflector directs cooling air across the specimens. A nozzle assembly sprays the specimens with deionized water in accordance with established schedules to simulate subtropical, | air tunnel semi-humid and temperate regions. J|^|^^{/(END view)}

target board

Night time spray cycles can ^air ' mi

be used to keep samples moist during the non-tracking portion of the test to provide the total time of wetness typically encountered in subtropical regions.

sky

radiation

flat

mirrors

mirror bed

■ Microprocessor Control

■ Programmable Cycles

■ Dual Axis Tracking

■ Thermal Shocks

■ Night Time Dew

■ Patented Temperature Control