Atlas Material Testing Technology LLC

Chicago, IL, United States

Atlas Material Testing Technology LLC

Chicago, IL, United States
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Dumbleton D.,Atlas Material Testing Technology LLC | Slomko R.,Atlas Material Testing Technology LLC
Conference Record of the IEEE Photovoltaic Specialists Conference | Year: 2013

We begin from the basic premise that the primary enemies of PV modules are heat, light and moisture, plus numerous other possible stressors which may or may not be participants, depending upon the specific location of the module. We have adopted a Coffin-Manson model to estimate what the effects of thermal cycling might be upon the PV module in support of empirical observations. It describes part of the environmental durability to be anticipated from subject modules (1). Although this model ignores the effects of humidity, solar irradiance, voltage variation and other mechanical and chemical stresses, it does offer us an estimate of the equivalence of a test methodology to a part of the real world environment. A realistic example of its use is described and calculated. © 2013 IEEE.


McGreer M.,Atlas Material Testing Technology LLC
PCI-Paint and Coatings Industry | Year: 2010

Light (UV radiation) is the most critical factor of weathering tests. Control of irradiance levels represents the state-of-the-art, but has inherent weaknesses regarding the information supplied to the user. The LS-200 full-spectrum monitoring device for laboratory instruments represents a significant step forward for the measurement of light in artificial weathering instruments The LS-200 provides an affordable, easy-to-use method to directly determine conformance to the spectral power distribution now specified in current performance-based test methods. Ultimately, this verification can help weathering laboratories reduce operational costs and improve test repeatability.


Haillant O.,Atlas Material Testing Technology GmbH | Dumbleton D.,Atlas Material Testing Technology LLC | Zielnik A.,Atlas Material Testing Technology LLC
Solar Energy Materials and Solar Cells | Year: 2011

A mathematical model based on the Arrhenius equation is used to determine the acceleration of temperature dependent degradation processes affecting the performance of polymeric PV modules in artificial weathering over two benchmark climates. To take into account the natural variability of stress factors in outdoor environments, equivalent temperatures corresponding to photothermally and thermally activated degradation processes were calculated using detailed temperature and radiation data for these modules. Temperature and radiation data for the accelerated laboratory weathering part were derived from the implementation of an international standard for the weathering of plastics. Depending on the value of the activation energy and the reference outdoor location, acceleration factors ranging from 3 to 11 were calculated. © 2011 Elsevier B.V. All rights reserved.


Zielnik A.,Atlas Material Testing Technology LLC
PPCJ Polymers Paint Colour Journal | Year: 2012

Fresnel sunlight concentrators and xenon arc weathering devices have been developed by Atlas Material Testing Technology, to provide faster results over real time. Fresnel sunlight concentrators track the sun during the day and focus 10 images of the sun on to the test target. The test specimens are then cooled so that their temperatures are near to what they would be on a static test fence. Periodic water sprays can be programmed to provide wetting or thermal shock during the day and/or night time dew wetting typical of south Florida or operated dry. As only the direct beam sunlight is focused, the actual concentration factor is about 8X over a natural exposure. This acceleration is seasonally dependent upon the sun and the test acceleration is, therefore, highest in summer. Xenon arc technique is relatively inexpensive and very useful in screening large numbers of binder formulations for UV and moisture resistance.


Zielnik A.,Atlas Material Testing Technology LLC
PPCJ Polymers Paint Colour Journal | Year: 2012

The need for faster weather testing of wood coatings has put demands on results being provided through a laboratory rather than the more time consuming outdoor methods. A common method is to coat a single wood board, with different formulations or film thicknesses. This provides a common platform to minimize substrate variables. A variety of wood types is used such as various species, heartwood and sapwood versions, and different ring and grain patterns, especially for woods with high extractables and staining potential. The most common technique is the fluorescent condensation'-based tester defined in ISO 4892-3. This technique alternates either UV-A or UV-B exposure at elevated temperature and humidity with a slight cool-down to promote moisture condensation on to the specimens. Xenon arc lamp-based weathering testers have the advantage that when properly set up they are the closest to reproducing full-spectrum solar radiation and its effects on materials.


Patent
Atlas Material Testing Technology Llc. | Date: 2016-05-04

A power supply for use in an accelerated weathering test apparatus can ignite the lamp without using a separate igniter and control both the xenon lamp radiated spectrum and its intensity in order to fully simulate the suns daily cycle, improve the ultraviolet output, reduce the infrared radiation, and compensate for the xenon lamp aging.


Patent
Atlas Material Testing Technology Llc. | Date: 2010-01-13

What is disclosed is a weathering test apparatus with an In situ, Real-time Color Measurement System (IRCMS) with an input optic connected to a light pipe placed in the chamber between a light source and a test specimen in turn connected to a color measuring sensor and the associated processing and storage system to determine the color of a specimen in a continuous fashion within the enclosure of the weathering device. The color obtained is then compared a stored value or reference to determine the color evolution over time and can also be compared with the Standard Reference Materials (SRM) to determine when standardized testing has achieved acceptable color change values. In another embodiment, the input optic is offset from a line between the specimen and the light source to limit interference of shading created by the optic, and in another embodiment, several input optics are used in tandem to measure the color of different specimens located at different angular orientations on the rotating rack in the chamber, In yet another embodiment, a second optic is used to take a full-spectrum measurement of the irradiant light source used in the color calculation under the CIE standard.


Patent
Atlas Material Testing Technology Llc. | Date: 2011-04-20

An apparatus for accelerating the weathering effects on test specimens within a test chamber (102) including a calibration-access assembly for replacing test sensors located within the apparatus with reference sensors when the apparatus door (106) is closed. An improved sensor support assembly is also included. The calibration-access assembly includes an aperture (116) defined in the door of the apparatus and a shield (118) connected to the door that is movable to permit or prevent access to sensors when the apparatus door is closed.


Patent
Atlas Material Testing Technology Llc. | Date: 2013-05-22

A power supply for use in an accelerated weathering test apparatus can control both the xenon lamp radiated spectrum and its intensity in order to fully simulate the suns daily cycle, improve the ultraviolet output, reduce the infrared radiation, and compensate for the xenon lamp aging.


Patent
Atlas Material Testing Technology LLC | Date: 2011-09-14

Methods and apparatus for accurate service life prediction by exposing a test specimen (101) to operating parameters of a multi-variable micro-environment cycle in an accelerated weathering test apparatus (100) including an irradiance source (108), a temperature adjustment source (110) and a moisture adjustment source (112) connected to a controller (114) to: expose the test specimen (101) to the operating parameters of the multi-variable micro-environment cycle recreated in the test chamber (104); monitor the exposure of the test specimen to the multi-variable micro-environment cycle to generate run-time variables; and adjust the run-time variables to reconcile to the operating parameters.

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