Optics: measuring and testing – By polarized light examination – With polariscopes
Patent
1989-12-22
1992-06-30
Evans, F. L.
Optics: measuring and testing
By polarized light examination
With polariscopes
356352, G01N 2121
Patent
active
051257432
ABSTRACT:
In a solar vector magnetograph for measuring solar magnetic fields including a telescope pointable to a solar zone and relay optics mounted there-behind, including a collimating lens, a quarter wave plate, a light polarizer, a beam expanding means, a narrow bandpass blocking filter to admit a narrow spectral band of polarized light, a reimaging lens to focus the resulting beam and an image receiver, the improvement provided is a solid Fabry-Perot etalon filter which is mounted between the blocking filter and the reimaging lens, such filter being of a desired refractive index and thickness so as to select a narrow band of the so-transmitted polarized light and to transmit same to the image receiver, all in order to isolate and record the emissions of atomic species and to infer the magnetic field at the solar zone. In another and preferred embodiment, the etalon filter is electrically tuneable to change its passband to select another narrow band of the transmitted polarized light and transmit it to the image receiver to record another image of the solar zone at the selected passband and compare with the image obtained at the previous passband to derive in greater detail a map of the intensity and the direction of the magnetic field in the solar zone, including the photosphere or the atmosphere thereabove so as to forecast solar flares and other disturbances based on solar magnetic field changes.
REFERENCES:
patent: 4508964 (1985-04-01), Gunning, III et al.
Lindgren et al, SPIE vol. 265, Supplement-Shuttle Pointing of Electro-Optical Experiments, 1981, pp. 47-52.
Rust et al, "Solar Vector Magnetograph for Max '91 Programs," presented at the Max '91 Workshop of the American Astronomical Society Solar Physics Div. meeting, Kansas City, Mo., Jun. 6-10, 1988, pp. 113-120.
Rust et al, "An Optical Instrument for Measuring Solar Magnetism", John Hopkins APL Technical Digest, vol. 9, No. 4 (1988), pp. 349-359.
NASA Tech Memo 4048 "The SAMEX Vector Magnetograph" Jun. 1988.
C. H. Burton et al, "Electrooptic Fabry-Perot filter: development for the study of solar oscillations", Appl. Opt. 226, 2637 (1987).
D. M. Rust et al, "Development of Ultrastable Filters and Lasers for Solar Seismology", Johns Hopkins APL Tech. DIG. 7, 209-216 (1986).
W. Gunning, "Double-cavity electrooptic Fabry-Perot tunable filter", Appl. Opt. 21, 3129 (1982).
Harris Terry J.
O'Byrne John W.
Rust David M.
Evans F. L.
Singer Donald J.
Stover Thomas C.
The United States of America as represented by the Secretary of
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