Spectrophotometer employing magneto-optic effect

• US 4,166,697 A
• Filed: 09/27/1977
• Issued: 09/04/1979
• Est. Priority Date: 10/01/1976
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Ito, Masaru, Murayama, Seiichi, Yamamoto, Manabu, Ohishi, Kounosuke
• Primary Examiner(s): Evans, F. L.
• Application Number:
  US05/836,971
• Time in Patent Office: 707 Days
• Field of Search: 356/85-88, 356/93-97
• US Class Current: 356/319
• CPC Class Codes: G01N 21/3103 Atomic absorption analysis

Abstract

This application discloses a spectrophotometer employing a magneto-optic effect which enables quantitative analysis of a sample to be measured by a double beam method. In performing the double beam method for analyzing the sample, a magnetic field is applied to the sample along with linearly polarized light from a light source, the forward scattered light scattered by the sample atoms and the incident linearly polarized light from the sample are converted into two cross-polarized beams of light using an analyzer, and these two beams of cross-polarized light are spectrally analyzed by a single dispersive element. The spectrophotometer of the invention provides an arrangement such that the plane defined by the above-mentioned two beams of light is perpendicular to the plane of dispersion of the dispersive element, and the two beams of light so dispersed are independently detected by separate detectors.

Claims

1. In a spectrophotometer employing a magneto-optic effect which includes;

a space for accommodating a sample to be measured;

means for applying a magnetic field to said space;

light irradiation means for irradiating said space with linearly polarized light;

polarization-separation means for allowing entry of the light from said light irradiation means after having passed through said space, and for separating and projecting this incident light in two light beams in proportion to the intensity of two mutually perpendicular polarization components;

spectral analyzer means equipped with means for converging the two light beams separated by said polarization-separation means and with a dispersive element for spectrally dispersing the two light beams thus converged; and

light detection means for detecting the two light beams dispersed by said dispersive element;

the improvement wherein said dispersive element is arranged in such a manner that the plane containing the two light beams incident on said dispersive element is substantially perpendicular to the plane defined by the dispersion direction of said dispersive element.

2. The spectrophotometer employing a magneto-optic effect as defined in claim 1, wherein the direction of application of a magnetic field by said application means is perpendicular to the direction of the incident light irradiated from said light irradiation means into said space, and defines an angle of 45°

relative to the direction of polarization of the light from said light irradiation means and an angle of 45°

relative to the horizontal plane.

3. The spectrophotometer employing a magneto-optic effect as defined in claim 1, wherein said light irradiation means and said polarization-separation means are arranged in such a manner that the plane including the two light beams projected from said polarization-separation means is a vertical plane.

4. The spectrophotometer employing a magneto-optic effect as defined in claim 1, wherein said polarization-separation means does not cause refraction but allows rectilinear propagation of the light entering said polarization-separation means through said space which has a direction of polarization perpendicular to that of the light irradiated from said light irradiation means.

5. The spectrophotometer employing a magneto-optic effect as defined in claim 2, wherein said light irradiation means and said polarization-separation means are arranged in such a manner that the plane including the two light beams projected from said polarization-separation means is a vertical plane.

6. The spectrophotometer employing a magneto-optic effect as defined in claim 3, wherein said polarization-separation means does not cause refraction but allows rectilinear propagation of the light entering said polarization-separation means through said space which has a direction of polarization perpendicular to that of the light irradiated from said light irradiation means.