| 摘要 |
1,203,253. Spectrometers. CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE and OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AEROSPATIALES. Aug.22, 1967 [Sept.1, 1966], No.38645/67. Heading G2J. An input or output device for a grid type spectrometer, provides, after dispersion, signals free from periodic side-structure, and consists of a random distribution of spaced areas 23 on a support 21 the said areas and the support having first and second radiation conveying characters such as transmission and non- transmission. Areas 23 are parallel and elongated in form and together comprises 40-60% of the total area of the support their shorter dimensions being parallel to the direction of dispersion. The support may be transparent, opaque or reflective, as may the randomly spaced areas. A device suitable for an auto-collimation spectrometer has two random sets of areas, each area in one set having a corresponding area in the other set synmetrically placed about the centre of the device. Such a device is prepared by dropping small white discs, "confetti", on to a sticky black, part spherical, concave surface (51), Fig.9 (not shown). The surface (51) is then moved normally to the plane defined by the axis of surface (51) and the optical axis of a camera (54) inclined to the first photographic plate (56) being exposed during this movement. A first random set of elongated images is obtained. The second set is obtained by turning surface (51) through 180 degrees about its axis and further exposing plate (56) during translation of the surface (51). The off-axis exposure corrects for the distortion of the spectrometer. |
