Optics: measuring and testing – By polarized light examination – With light attenuation
Patent
1989-10-16
1992-05-12
Evans, F. L.
Optics: measuring and testing
By polarized light examination
With light attenuation
356375, 346 33C, G01B 1114, G01D 900
Patent
active
051121301
ABSTRACT:
The present invention relates to a separation measuring method and a separation measuring apparatus for measuring the separation of objects, which have been displaced relatively, by using optical distance measuring equipments, and more particularly to a separation measuring method and a separation measuring apparatus most suitable for the detection of the activity of a fault to predict an earthquake. In the present measuring method, two optical distance measuring equipments are arranged near the separation plane, and carry out measurement simultaneously to measure a first distance and a second distance, and the difference between the first distance and the second distance is calculated to find the separation of the first and second objects, so that the separation can be measured by simultaneous observations. Since the present invention can find the separation by simultaneous measurements and therefore will not undergo the influence of meterological conditions such as atmospheric pressure, temperature, etc. The present measuring apparatus is provided with a measurement start signal forming means and an arithmetic section, and can operate two optical distance measuring equipments simultaneously to calculate at a high speed the difference of the measured values of the optical distance measuring equipments. Thus, an observation environment can be provided wherein variation of the earth's crust can simultaneously be observed independent of observation condition factors such as temperature, atmospheric pressure, etc.
REFERENCES:
patent: 3180205 (1965-04-01), Hepp et al.
patent: 4576481 (1986-03-01), Hansen
Evans F. L.
Hantis K. P.
Kabushiki Kaisha Topcon
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