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Apparatus for absorptiometric analysis

  • US 4,685,801 A
  • Filed: 12/23/1985
  • Issued: 08/11/1987
  • Est. Priority Date: 10/15/1982
  • Status: Expired due to Fees
First Claim
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1. An apparatus for measuring absorbances of samples contained in reaction vessels, comprising:

  • illuminating means for emitting light beams;

    measuring means for measuring the intensity of the light beams transmitted through the samples contained in the vessels;

    transfer means for transferring reaction vessels successively forwarded to predetermined measuring points on a reaction line;

    guiding means having stationary optical fibers, each with a beam-receiving end and a beam-emitting end, for guiding through a first portion of said stationary fibers light beams emitted from the illuminating means to the samples contained in the respective vessels staying at the measuring points, and for guiding through a second portion of said stationary fibers the light beams transmitted from the respective samples to the measuring means;

    switching means for selecting one transmitted light beam through the reaction vessel staying at one measuring point, and directing the selected beam to the measuring means, said switching means including;

    (a) a holder for holding the optical fibers, the beam-emitting ends of which are arranged so that the light beams passing through the optical fibers are emitted substantially simultaneously from the respective beam-emitting ends of the optical fibers;

    (b) a first mirror for reflecting one light beam transmitted from the corresponding fiber;

    (c) a rotating member for rotating the first mirror to align the same with the beam-emitting ends of said optical fibers one after another, so that said first mirror reflects the light beams from the corresponding fibers, the first reflecting mirror scanning the beam-emitting ends of all optical fibers held by the holder, every time the first mirror rotates when the vessels stay at the measuring points; and

    (d) a second mirror for reflecting said light beam reflected from said first mirror and passing it through a common light path to said measuring means, regardless of the position of the optical fiber aligned with the first mirror;

    a plurality of slit members disposed along the common light path; and

    a diffraction grating, disposed along the common light path downstream of said slit members, for diffracting the beam that has passed through said slit members.

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