LONG DISTANCE INTERFEROMETRIC MEASUREMENTS WITH REFRACTIVE INDEX CORRECTION BASED ON SPEED OF SOUND |
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| Milena Astrua, Marco Pisani, Massimo Zucco |
- Abstract:
- At INRIM a novel absolute long distance interferometer has been developed for application in space missions. The interferometer has been successfully tested for long distance measurements in air. Main limitation of such measurements is the knowledge of refractive index of air which in turn is mainly affected by air temperature. A method to measure average air temperature based on the measure of the speed of sound has been developed and combined with the absolute interferometer achieving measurement uncertainties less than 1 ppm in open air up to a 78 m distances.
- Keywords:
- long distance interferometry, refractive index of air, temperature measurement, synthetic wavelength
- Download:
- IMEKO-TC14-2014-21.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC14
- Event name:
- TC14 LMPMI Symposium 2014
- Title:
11th Symposium on Laser Metrology for Precision Measurement and Inspection in Industry
- Place:
- Tsukuba, JAPAN
- Time:
- 03 September 2014 - 05 September 2014