Title :
High-resolution monitoring of air density with an optical wavelength refractometer
Author :
Pendrill, L.R. ; Johansson, B. ; Kallgren, H.
Author_Institution :
Swedish Nat. Testing & Res. Inst., Boras, Sweden
Abstract :
A laser optical wavelength refractometer, based on a Michelson interferometer, is used for gas density determination of air as needed for buoyancy corrections in precision weighings. Comparisons are made with other gas density methods, for example the weighing of sinkers. A laser interferometer with an increased optical path resolution of /spl lambda//400 at 633 nm is employed to monitor density changes at the 10/sup 5/ level.
Keywords :
Michelson interferometers; air; density measurement; measurement by laser beam; monitoring; refractometers; 633 nm; Michelson interferometer; air; gas density monitoring; laser optical wavelength refractometer; optical path resolution; Atom optics; Density measurement; Equations; Gas lasers; Laser transitions; Monitoring; Optical interferometry; Optical refraction; Optical variables control; Prototypes;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 1998 Conference on
Conference_Location :
Washington, DC, USA
Print_ISBN :
0-7803-5018-9
DOI :
10.1109/CPEM.1998.699881
