Spectrophotometer

A spectrophotometer and spectrophotometer technology, which is applied in the directions of spectrometry/spectrophotometry/monochromator, analytical materials, optical radiation measurement, etc. Large and other problems, to achieve the effect of suppressing drift, high S/N, and high stability of transmitted light

Inactive Publication Date: 2013-07-24
HITACHI HIGH-TECH CORP
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

A spectrophotometer using a two-beam system using an image sensor has problems of complicated structure, increased volume, and increased manufacturing cost

Method used

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Examples

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Embodiment Construction

[0027] refer to figure 1 , the first example of the spectrophotometer of the present invention will be described. The spectrophotometer of this example has first and second light sources 1 and 2, a sample cell 5, a detection optical system, a detection optical system computing unit, a light source monitoring optical system, a light source monitoring system computing unit, and a computer 17. The detection optical system has a dichroic mirror 3 , an imaging lens 7 , a polychromator 10 and a one-dimensional image sensor 12 . A two-dimensional image sensor may also be used instead of the one-dimensional image sensor 12 . The detection optical system computing unit has an amplifier 15 and an A / D converter 16 .

[0028] The light source monitoring optical system has first and second optical fibers 21A, 21B, first and second lenses 23A, 23B, and first and second light source monitoring photodetectors 24A, 24B. The optical fibers 21A, 21B may also be optical fiber bundles. The lig...

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Abstract

The present invention is capable of obtaining highly stabilized transmission and absorption spectra with high S / N and drift suppressed over a long time even when the amount of light of a light source temporally changes in a single-beam spectrophotometer. A spectrophotometer comprises: a light source; a sample cell; a polychromator which generates the transmission spectrum of a sample in the sample cell by dispersing light transmitted through the sample out of light from the light source into a plurality of wavelength components; an image sensor which detects the transmission spectrum of the sample; a light source monitor light detector which detects light not transmitted through the sample out of the light from the light source; and a calculation unit which corrects the transmission spectrum of the sample using an output signal of the light source monitor light detector.

Description

technical field [0001] The present invention relates to a spectrophotometer for measuring the transmission spectrum or absorption spectrum of a sample, and more particularly to a single-beam system spectrophotometer. Background technique [0002] Conventionally, a so-called two-beam type spectrophotometer is known as a spectrophotometer for measuring a transmission spectrum or an absorption spectrum. In the spectrophotometer of the double-beam system, two cells are provided, a sample cell and a reference cell, and the light quantity of light passing through each cell is measured, and the ratio thereof is calculated to obtain a transmission spectrum. In addition, the absorption spectrum is obtained by logarithmically transforming the vertical axis of the transmission spectrum. In the spectrophotometer of the double-beam system, since the light beam for the sample cell and the light beam for the reference cell are measured at the same time, there is an advantage that an accur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/27G01J3/02G01J3/36
CPCG01J3/00G01N21/3151G01J3/0218G01N21/05G01J3/42G01J2003/2866G01J3/28
Inventor 松井繁山村周平秋山秀之江畠佳定
Owner HITACHI HIGH-TECH CORP
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