Loading...
Please wait, while we are loading the content...
Using a temperature-controlled quartz crystal microbalance in a space equipment cleanroom to monitor molecular contamination
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Mitchell, William J. |
| Copyright Year | 1994 |
| Description | There is a need for continuous monitoring for molecular contamination in clean rooms where spaceflight equipment is assembled, integrated, and tested to insure that contamination budgets are met. The TQCM (temperature-controlled quartz crystal microbalance) can be used to provide both a real time warning and a cumulative measurement of molecular contamination. It has advantages over the other measurement methods such as witness mirrors, NVR (non-volatile residue) plates, and gas analyzers. A comparison of the TQCM sensitivity and ease of operations is made with the other methods. The surface acoustic wave microbalance (SAW), a newly developed instrument similar to TQCM, is considered in the comparison. An example is provided of TQCM use at Goddard Space Flight Center when the Wide Field Planetary Camera 2(WFPC-2) and the Corrective Optics Space Telescope Axial Replacement (COSTAR) were undergoing integrated testing prior to their installation in the Hubble Space Telescope on its first servicing mission. Areas for further investigation are presented. |
| File Size | 616559 |
| Page Count | 12 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19950007656 |
| Archival Resource Key | ark:/13960/t6c29th9z |
| Language | English |
| Publisher Date | 1994-11-01 |
| Access Restriction | Open |
| Subject Keyword | Residues Microbalances Acoustic Propagation Clean Rooms Optical Equipment Space Environment Simulation Contamination Real Time Operation Outgassing Temperature Effects Hubble Space Telescope Cameras Installing Quartz Crystals Mirrors Gas Detectors Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
