RESUMO
The possibility is considered of controlling the parameters of articles of complicated shape by their spatial spectra, that is, profile angle, mean diameter, and threaded article pitch.
RESUMO
A ballistic gravimeter has been constructed using a laser interferometer to measure the vertical distance traversed by a free-falling body and a rubidium frequency standard to measure elapsed time. The error in distance and time measurement are estimated to be less than 2 x 10(-8) and 2 x 10(-11) respectively. The systematic error in measuring gravitational acceleration, after corrections have been made, does not exceed 0.02 mgal.
RESUMO
Laser interferometers for measuring lengths, gas refraction indexes, and laser wavelengths and for determining relative object positions have been developed. The instruments are based on a traditional principle of fringe-counting interferometers; for the determination of positions a reversed aperture interferometer sensitive to light-source displacements has been used.
