X-ray or gamma ray systems or devices – Specific application – Diffraction – reflection – or scattering analysis
Patent
1980-12-23
1982-12-21
Smith, Alfred E.
X-ray or gamma ray systems or devices
Specific application
Diffraction, reflection, or scattering analysis
356333, 356334, 378 44, G01N 2320, G01J 312, G01J 318
Patent
active
043651569
ABSTRACT:
A tunable monochromator selects a narrow range of wavelengths from a broadband source of radiation, such as a synchrotron X-ray source, visible light, etc. Wavelength selectivity is obtained by Bragg reflection from crystal surfaces or by diffraction gradings, prisms, etc. The inventive apparatus maintains proper orientation of two rotary members, at least one of which is typically a wavelength selective member. The apparatus allows the angles of incidence and reflection to be changed, thus changing the wavelength selected without changing the output angle or height. Two wavelength selective members can be used, or a detector probe may be positioned relative to a single wavelength selective member, or a desired polarization can be obtained with the use of a single wavelength selective member and a quarter wavelength plate. Other devices employing the .theta.-2.theta. principle, including variable delay lines, can be realized with the device.
REFERENCES:
patent: 2305776 (1942-12-01), Hansen
patent: 3914605 (1975-10-01), Hara
patent: 4028547 (1977-06-01), Eisenberger
Finkelstein, N. A., "An Efficient Grating Mount" J.O.S.A., vol. 41, No. 3, Mar. 1951, pp. 179-182.
Hart, M., "X-ray Polarization Phenomena," Phil. Mag. B., 1978, vol. 38, No. 1, pp. 41-56.
Hastings, J. B., et al., "A Separated Function Focusing Monochrometer System for Synchrotron Radiation," Nuclear Instr. and Meth., vol. 152, 1978, pp. 167-171.
Koval'chuk et al., "A Two-Crystal X-ray Spectrometer with Congruent Rotation Axes," translated from Pribory i Tekhnika Eksperimenta, vol. 18, part 2, No. 4, pp. 203-205, Jul.-Aug. 1975.
Lipsett, F. R., et al., "Varioilluminator (Subtractive Double Monochromator with Variable Bandpass)," Applied Optics, vol. 12, No. 4, Apr. 1973, pp. 818-821.
Golovchenko Jene A.
Levesque Richard A.
Bell Telephone Laboratories Incorporated
Fox James H.
Grigsby T. N.
Smith Alfred E.
Wilde Peter V. D.
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