CerMark Laser Marks Return From Space!

DPM Data Matrix Samples Retrieved from ISS

The following is condensed from the August 2005 UID Newsletter, published monthly by Acuity CiMatrix. This article was written by Don Roxby of the RVSI Symbology Research Center, Huntsville AL.

Prior to the Space Shuttle Program, space-borne vehicles were expended; consequently their part identifiers were applied using marking processes designed for use in ground operations. With the advent of reusable space transportation vehicles and satellites, NASA needed to rethink how part identification markings were applied. Markings applied to reusable spacecraft need to survive the extreme enviroments encountered in space.

To support this new requirement, NASA approached RVSI to assist with a marking program to certify marking(s) for use in Low Earth Orbit (LEO). An experiment was designed to identify part identification methods and techniques that will survive the rigors of space. The experiment was to be designed to expose human and machine-readable markings to LEO environments. These include, but are not limited to, vacuum, solar UV radiation, micrometeoroids and space debris, atomic oxygen (AO) and deep thermal cycles. Working with the Boeing Phantom Works, RVSI Acuity CiMatrix’s Symbology Research Center applied markings to test coupons made of materials commonly utilized in the construction of the external components used on space transportation vehicles, satellites and space stations.

The test coupons consisted of 26 one-inch diameter disks, a 1-1/2-inch by 6-inch bar and a 4-inch square beta cloth blanket with fastener holes. The coupons were marked with labels, stenciled (additive) markings and direct markings applied using a wide range of different methods and techniques. (Note: CerMark's laser marking materials were a part of this test series) The material test coupons were then affixed to spaces provided on test panels, which were attached to the International Space Station (ISS) during a space walk conducted during the STS-105 Mission flown on August 10, 2001. The panels were positioned on the ISS so that they to could expect to receive the maximum amount of impact damage and exposure to a high degree of AO and UV radiation.

The experiments were recovered early during the STS-114 mission by Astronaut Stephen Robinson on July 30, 2005 when an opportunity presented itself during his record breaking six hours, fifty minute space walk. They were returned to earth on August 9, 2005. The marked coupons will be taken RVSI Acuity CiMatrix's Symbology Research Center where they will undergo a series of decoding tests designed to qualify identification processes for future retrievable spacecraft and satellites. Data from this in-orbit experiment will be added to NASA and military part marking standards.

For more information, contact Don Roxby droxby@rvsi.net , or visit www.uidsupport.com/newsletter/august_news/in_this_issue0508.htm