Abstract
A vacuum-pipeless laser strainmeter has been designed, tested, and is described. The strainmeter has a compensator for the change of the refractive index of air which is determined by Edlén’s formula using measured values of atmospheric pressure and temperature. The effect of air-condition change was compensated by the compensator, and residual of the effect was less than ±5 × 10−9 for 75 h. The strainmeter has successfully recorded solid tidal strains.
© 1981 Optical Society of America
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