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polarisationsoptische pruefeinrichtung and polarisationsoptisches pruefverfahren
polarisationsoptische pruefeinrichtung and polarisationsoptisches pruefverfahren
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机译：极化光化学法和极化光化学法
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882,244. Photo-electron analysis. NATIONAL RESEARCH DEVELOPMENT CORPORATION. Nov. 29, 1957 [Nov. 29, 1956], No. 36590/56. Class 40(3). [Also in Group XX] A process control system uses a polarimeter in which the plane of polarization of a light beam is oscillated about the position for extinction, when no specimen is present, by using the Faraday effect, and the rotation produced by the specimen is evaluated from the component of light transmitted at the frequency of the oscillation and incident on a photo-cell, the signal from which is applied to the control of the process. As shown, monochromatic light from a lamp 1 and filter 6 is collimated by lenses 2 and 3 and plane polarised at 7 before passing through a Faraday device consisting of a transparent rod 8 surrounded by a wire coil 11, a specimen cell 23, and a similar Faraday device 24 to a crossed analyser 14 and thence to a photo-cell 16. The axial magnetic field in rod 8 due to the application of alternating current to coil 11 oscillates the plane of polarisation of the light beam about the extinction position, and the plane of polarisation is also rotated by the specimen in the test cell. The component of the photo-cell output having the frequency of the alternating current is filtered out and applied to an indicator and also to the control of a process involving the sample in cell 23. In order to find the rotary power of a solution which may flow through cell 23, a direct current is applied to the Faraday device 24 so as to produce a rotation of the plane of polarisation opposite to that introduced by the specimen and resistance is adjusted until indicator reads zero. Faraday device 24 may be omitted in which case a variable direct current may also be applied to the winding 11 for the same purpose. So that a constant watch may be kept on the specimen, the output from -a photo-multiplier may be fed back through a recorder to the Faraday device 24 (Fig. 8, not shown). The output signal from the photo-cell may also be used to provide automatic control of a processing plant from which is derived the solution which flows through cell 23.
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