| Autor: |
Butel, Guillaume P., Smith, Greg A., Burge, James H. |
| Předmět: |
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| Zdroj: |
Optical Engineering; Feb2015, Vol. 54 Issue 2, p1-9, 9p |
| Abstrakt: |
Deflectometry is a powerful metrology technique that uses off-the-shelf equipment to achieve nano-meter-level accuracy surface measurements. However, there is no portable device to quickly measure eye-glasses, lenses, or mirrors. We present an entirely portable new deflectometry technique that runs on any Android™ smartphone with a front-facing camera. Our technique overcomes some specific issues of portable devices like screen nonlinearity and automatic gain control. We demonstrate our application by measuring an amateur telescope mirror and simulating a measurement of the faulty Hubble Space Telescope primary mirror. Our technique can, in less than 1 min, measure surface errors with accuracy up to 50 nm RMS, simply using a smartphone. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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