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    Spectrometer
    342.
    发明专利
    Spectrometer 未知

    公开(公告)号：GB958957A

    公开(公告)日：1964-05-27

    申请号：GB1823660

    申请日：1960-05-24

    Applicant: ONERA (OFF NAT AEROSPATIALE)

    IPC: G01J3/08 ,  G01J3/28

    Abstract: 958,957. Spectrometers. OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AEROSPATIALES. May 24, 1960 [May 27, 1959; April 20, 1960], No.18236/60. Heading G1A. [Also in Division G2] The spectrometer has an entry grid G in the focal plane of a collimator C, the radiation being dispersed at D before passing to a lens C 1 having in its focal plane F 1 an out-put grid G 1 . Each grid consists as shown in Fig. 2, of alternating opaque strips p 1 , p 2 ..p n and transparent strips V 1 , V 2 . . . V n , the edges of each strip extending perpendicularly to the dispersion plane. The total area of the transparent strips is the same as that of the opaque strips, the strips of each grid being so distributed that for example the distance X n of the n. th. strip from one edge b o of the grid is given by the formula x n 2 = nx 1 2 , where x 1 is the distance of the inner edge b 1 of the second strip from the same edge b o of the grid. The opaque strips of the output grid may be reflecting. With this arrangement the lenses C, C 1 will, for radiation of one wavelength corresponding to the position of the dispersive system D, image the grid G exactly upon the grid G 1 so that all the radiation of this wavelength which is transmitted by the grid G will also be transmitted by the grid G 1 . The image of each transparent strip in the grid G will, in radiation of another wavelength, be formed at a position offset from the corresponding transparent strip of the grid G 1 so that some of this radiation will be reflected by the grid G 1 . The radiation transmitted by both grids is fed to a radiation detector and the radiation reflected by the output grid is fed to another detector and the intensities of the two beams are then compared. Each grid may be of square, rectangular, triangular or lozenge form or be formed by an annular sector (Fig. 30, not shown). Instead of two detectors, a differential pick-up may receive both beams. In other forms, (1) the input grid is made up of two grid members which are made alternatively operable either by moving the inoperable member out of the radiation path (Fig. 21 not shown) or by using a rotatable chopper (Figs. 24, 25 not shown); (2) the opaque strips of the input grid are reflecting and a chopper is arranged so that radiation is incident alternately on the transparent and reflecting strips (Fig. 19, not shown).

    Spectrophotometer
    343.
    发明专利
    Spectrophotometer 未知

    公开(公告)号：GB943165A

    公开(公告)日：1963-11-27

    申请号：GB4472461

    申请日：1961-12-14

    Applicant: BECKMAN INSTRUMENTS INC

    IPC: G01J1/36 ,  G01J3/08

    Abstract: 943,165. Vibratory electric motors. BECKMAN INSTRUMENTS Inc. Dec. 14, 1961 [Aug. 18, 1961], No. 44724/61. Heading H2A. [Also in Division G1] The invention relates to an electromagnetic device for vibrating an oscillating structure of a photo-electric spectrophotometer of the type described in Specification 753,890. A frame 32 of the structure (Fig. 2, not shown), has tabs 37, 38 securing a horizontal strip or armature 39 of silicon steel, the centre of which is encircled by a coil 44. Adjacent the ends of the strip 39 are two permanent magnets 47, 48 shaped and positioned as shown, and when an alternating current having a frequency equal to the natural frequency of the structure is fed to the coil 44 the strip oscillates between them in the horizontal plane causing the structure to oscillate. Adjustably mounted on the tab 38 is a vane 42 interposed between a lamp 53 and a photo-electric element 57. The lamp 53 is enclosed in a container (Fig. 3, not shown), having an aperture aligned with an aperture in an enclosure of the element 57 and the vane is mounted relative to the apertures so that a beam from the lamp 53 is blocked from the element 57 by the vane when the structure is in one of its extreme positions and becomes gradually unblocked as the structure moves to its other extreme position. A vane 41 similarly mounted, relative to a lamp 62 and a photo-resistive element 63 unblocks the beam from the lamp 62 to the element 63 only when the structure is at its second extreme position, i.e. the position where a large portion of the radiation from the lamp 53 falls on element 57. The signals from the photoresistive elements are fed to an electronic circuit (Fig. 5, not shown), which controls the current flowing through the coil 44. Initially, small fluctuations of the oscillating structure are sensed by the element 57 and amplified by the circuit causing the coil 44 to increase the amplitude of the oscillation. When the structure has reached a desired maximum amplitude of oscillation, the element 63 is exposed and the signal therefrom reduces the signal from the element 57 thus reducing the current in the coil. The arrangement ensures that the energy supplied by the coil is just enough to maintain the structure in oscillation.

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