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Absorbance detector and chromatograph provided with same

A technology of absorbance and detector, applied in the field of absorbance detector

Active Publication Date: 2018-10-23
SHIMADZU SEISAKUSHO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if you want to measure with multiple wavelengths, you need to install multiple LED elements with different wavelengths

Method used

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  • Absorbance detector and chromatograph provided with same
  • Absorbance detector and chromatograph provided with same
  • Absorbance detector and chromatograph provided with same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0044] (1) In the liquid chromatograph 1 described above, although the LED control unit 31a is configured to calculate the upper limit value I of the driving current based on the ambient temperature t and the thermal resistance (for example, 45°C / W) of the UVLED element 21a and the UVLED element 21b UP , but instead, it may also be configured to use "ambient temperature t - upper limit value I of drive current UP table" to calculate the upper limit value of the drive current I UP .

[0045] (2) In the above-mentioned liquid chromatograph 1, although the LED control unit 31a is configured to calculate the upper limit value I of the driving current after the temperature control unit 41a judges that the temperature t' of the thermostat is stabilized at the set temperature. UP , but instead of it, it may also be configured to execute the calculation of the upper limit value I of the driving current only when the user inputs " UP function", calculate the upper limit value of the ...

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Abstract

Provided are an absorbance detector and a chromatograph with which it is possible to constantly obtain a maximum quantity of light without suppressing a drive current, even when disposed within a column oven. The present invention is provided with: an absorbance detector cell 20 comprising a light-emitting unit 21 having LED elements 21a, 21b, a light-receiving unit 22 having a photodiode 22a, anda cell 23 in which a specimen is accommodated, the absorbance detector cell 20 being disposed between the light-emitting unit 21 and the light-receiving unit 22; an LED control unit 31a for outputting a drive current to the LED elements 21a, 21b; and a temperature sensor 21d for detecting the surrounding temperature around the LED elements 21a, 21b. The LED control unit 31a determines an upper-limit value for the drive current outputted to the LED elements 21a, 21b on the basis of the surrounding temperature detected by the temperature sensor 21d.

Description

technical field [0001] The invention relates to an absorbance detector, in particular to an absorbance detector arranged in a column thermostat of a chromatograph. Background technique [0002] Absorbance photometry is also used as an official method for quantifying various substances, and is adopted in various fields as a highly versatile measurement method. In order to perform measurement by such absorptiometry, an absorbance detector for detecting the degree of absorption of light by a sample to be measured, that is, the absorbance is required. [0003] The absorbance detector is composed of a light-emitting unit, a light-receiving unit, and a cell for accommodating a sample, and the cell is arranged on a measurement optical path between the light-emitting unit and the light-receiving unit. Although the light emitting part differs depending on the wavelength to be measured, when measuring the wavelength in the visible light region, a tungsten lamp or a halogen lamp is us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33G01N21/01
CPCG01N21/31G01N2201/0627G01N2201/069H05B45/18G01N30/74G01N2030/3084G01N21/01G01N21/33G01N30/02G01N2030/027
Inventor 中村恭章
Owner SHIMADZU SEISAKUSHO CO LTD