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.
LONG DISTANCE INTERFEROMETRIC MEASUREMENTS WITH REFRACTIVE INDEX CORRECTION BASED ON SPEED OF SOUND / Astrua, Milena; Pisani, Marco; Zucco, Massimo. - (2014). (Intervento presentato al convegno 11th IMEKO Symposium LMPMI2014 (Laser Metrology for Precision Measurement and Inspection in Industry) tenutosi a Tsukuba, Japan nel September 02-05, 2014).
LONG DISTANCE INTERFEROMETRIC MEASUREMENTS WITH REFRACTIVE INDEX CORRECTION BASED ON SPEED OF SOUND
ASTRUA, MILENA;PISANI, MARCO;ZUCCO, MASSIMO
2014
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
