Diode array detector based on multistage signal calibration and calibration method

A diode array and detector technology, applied in the detection field of liquid chromatography system, can solve the problems of high noise and drift signal and low accuracy of measurement results, and achieve the goal of reducing optical noise, small stray light, and reducing noise and drift Effect

Active Publication Date: 2020-05-19
DALIAN ELITE ANALYTICAL INSTR
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  • Abstract
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Problems solved by technology

[0008] Aiming at the problems existing in the above-mentioned prior art, the present invention discloses a diode array detector and a calibration method based on multi-level signal calibration. The present invention utilizes the automatic control of the optical path switch mechanism and the blackening array unit to realize dark current calibration and utilizes The internal reference function of the signal acquisition circuit performs real-time calibration of the collected spectral signals, which solves the problems of high noise and drift signals of the diode array detector instrument and low accuracy of measurement results, and realizes real-time calibration of the spectral signals of the instrument , which improves the accuracy of the detection results

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  • Diode array detector based on multistage signal calibration and calibration method
  • Diode array detector based on multistage signal calibration and calibration method
  • Diode array detector based on multistage signal calibration and calibration method

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Embodiment

[0040]The diode array detector in the present embodiment is made up of optical path part and circuit part, and described circuit part comprises: signal acquisition circuit, control circuit and computer interface circuit; figure 1 As shown, the optical path is divided by the sample cell 7, and is composed of the front optical path, the sample cell 7 and the rear optical path. The front optical path includes a combined light source 3, a light source focusing lens 4, a quartz window 5, and an optical path switch mechanism 6. The optical path includes a rear focusing lens 8 , a slit 9 , a flat mirror 10 , a concave flat field grating 11 , and a diode array detector 12 .

[0041] The light source 3 is preferably a combined light source of a deuterium lamp 1 and a tungsten lamp 2 with a central light-through structure. After the light emitted by the light source 3 is converged by the light source focusing lens 4, it passes through the quartz window 5 and the optical path switch mecha...

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Abstract

The invention relates to a detection technology of a liquid chromatography system. The invention relates to a diode array detector, in particular to a diode array detector based on multistage signal calibration and a calibration method. Dark current calibration is realized by utilizing automatic control of the optical path switching mechanism and the blackening array unit, and an internal reference function of the signal collection circuit is utilized. According to the invention, the collected spectral signals are calibrated in real time, the problems of high noise and drift signals of a diodearray detector instrument and low accuracy of a measurement result are solved, real-time calibration of the spectral signals of the instrument is realized, and the accuracy of the detection result isimproved.

Description

technical field [0001] The invention relates to the detection technology of a liquid chromatography system, in particular to a diode array detector and a calibration method based on multilevel signal calibration. Background technique [0002] For liquid chromatography analysis, most of the measured substances have ultraviolet absorption, so the light absorption ultraviolet detector based on Lambert Beer's law is one of the most widely used selective detectors in liquid chromatography systems. From the perspective of the optical path structure, according to the relative position of the spectroscopic device and the sample cell, this type of detector can be divided into ultraviolet-visible detectors and diode array detectors. The former first splits the compound light, and irradiates the sample with monochromatic light to obtain the absorbance information of the sample at a certain wavelength; the latter uses the compound light to irradiate the sample, and splits the transmitte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/74G01N30/62G01N30/86
CPCG01N30/74G01N30/62G01N30/8665G01N2030/626
Inventor 封娇杨三东马周韩雪王文晶于德秀唐涛李彤
Owner DALIAN ELITE ANALYTICAL INSTR
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