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Wide range deuterium lamp background correcting system

A background correction and wide-range technology, applied in the field of background correction system, can solve the problems of unbalanced two beams of light with longer wavelengths and different spot energy distribution, and achieve the effect of high repeatability, high precision and fast correction speed

Inactive Publication Date: 2005-06-01
上海天美科学仪器有限公司
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AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a wide-range deuterium lamp background correction system to overcome the defects of the prior art such as different spot energy distribution and inability to balance the two beams of light with longer wavelengths

Method used

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Embodiment Construction

[0010] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0011] Such as figure 1 , the present invention includes a hollow cathode lamp 1, a deuterium lamp 3, a burner front lens 4, a burner 5, a burner rear mirror 6, a monochromator 7, a photomultiplier tube 8, a signal detection processing part 9, and a The front lens 4 is used for compound deuterium lamps and hollow cathode lamps, and the mirror 2 driven by the stepping motor 10, the deuterium lamp 3 adopts pulse power supply, and the signal detection and processing part automatically controls the stepping motor and adjustable The deuterium lamp pulse current can also control the current of the hollow cathode lamp.

[0012] In order to improve the matching ability of the two beams of light, the adjustable current range is from 50mA to 600mA.

[0013] The deuterium lamp is a synthetic quartz window type high-energy deuterium lamp, whose energy ...

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Abstract

The wide-range deuterium lamp background correcting system includes hollow cathode lamp, deuterium lamp, front lens, burner, back lens, monochromator, photomultiplier and signal detecting processor, as well as half-reflecting mirror, which is located in front of the front lens and driven with a stepped motor for compounding the deuterium lamp and the hollow cathode lamp. The deuterium lamp is pulse powered, and the signal detecting processor controls the stepped motor and the adjustable deuterium lamp pulse current automatically. Owing to the combination of the half-reflecting mirror and the current adjustable high strength deuterium lamp and the program controlled energy balance, the deuterium lamp background correction for atomic absorption spectrophotometer may be expanded to element Cs with longest wavelength of 852.1 nm. In addition, the system has long term high precision, high repeatability and fast correction speed.

Description

technical field [0001] The invention relates to a background correction system of an atomic absorption instrument, in particular to a wide-range deuterium lamp background correction device. Background technique [0002] As we all know, background absorption from molecular absorption and light scattering is broadband absorption, while atomic absorption is narrow-band absorption. If the background is not corrected, the analysis results will be high. Therefore, background correction has become an essential part of atomic absorption spectrophotometry, and the most commonly used correction technique is the deuterium lamp method. Since this method uses independent light sources with different properties, it has certain limitations, which has the following disadvantages: 1. The sizes of the two light source spots are different, and the energy distribution of the spot itself is also different; The background correction is performed in the wavelength range, usually 190-350nm, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/00
Inventor 吴洪池朱健行朱应生许善勇
Owner 上海天美科学仪器有限公司
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