Twin-etalon scanning spectrometer

Details Twin-etalon scanning spectrometer Twin-etalon scanning spectrometer

1982-10-22

1985-06-25

Willis, Davis L.

Optics: measuring and testing

By particle light scattering

With photocell detection

356352, G01B 902

Patent

active

045250677

ABSTRACT:
A twin-etalon scanning spectrometer is disclosed that provides high luminosity and high resolution. The etalons are positioned in spaced relationship with respect to one another in series in the path of an emission light source. With identical etalons so positioned, a line emission transmitted by the rearwardly positioned etalon is at the same angles as that of the forwardly positioned etalon and the light transmission through the etalons is therefore at a maximum. When the relative spacing of the light transmission elements of one etalon is changed, however, the angles of transmission of the etalons are mismatched and the transmission of the light through the etalons is decreased until a minimum is reached when a .lambda./4 change in light transmission element spacing of one etalon relative to the other etalon has been effected. By varying the spacing between maximum and minimum, modulation of the incoming light is effected, which modulated radiation is then collected by a detector with the resulting electrical signals then being processed for display.

REFERENCES:
patent: 3373651 (1968-03-01), Mack et al.
patent: 3984190 (1976-10-01), Barrett et al.
patent: 4225236 (1980-09-01), Sandercock
Itoh et al, "Brillouin Scattering Study of Gd.sub.2 (MoO.sub.4).sub.3 Using Double-Fabry-Perot Interferometer", Japan. J. Appl. Phys., vol. 14, Suppl. 14-1, pp. 83-86, 1975.
Kohno, "A Scanning Fabry-Perot Interferometer for Space Research" Optica Acta vol. 26, No. 8, pp. 1057-1071, Aug. 1979.
Hernaudez et al. "TESS: A High-Luminosity High-Resolution Twin-Etalon Scanning Spectrometer", Applied Optics, vol. 20, No. 21, pp. 3687-3688, Nov. 1981.

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