Deuterium lamp power control circuit used for atomic absorption spectrophotometer

Abstract

The invention discloses a deuterium lamp power control circuit used for an atomic absorption spectrophotometer, which is used for controlling power switching provided to the load of a deuterium lamp. The deuterium lamp power control circuit comprises a power input end used for providing power for the load of the deuterium, a singlechip interface end used for providing a control signal for the circuit, and an interface end of the load of the deuterium lamp which is connected to the load of the deuterium lamp, wherein the power input end is connected with a DC / DC converting circuit which is then connected with the singlechip interface end; the DC / DC converting circuit consists of a DC / DC convertor module, a filtration module, an output voltage control module and a circuit enabling module which are connected; and the output voltage end of the output voltage control module is connected with the interface end of the load of the deuterium lamp. The deuterium lamp power control circuit applies the DC / DC converting circuit to the deuterium lamp power control, and converts output voltage in due time by changing feedback quantity so as to prolong the service life of the deuterium lamp greatly and achieve better background taking off effect.

Description

technical field [0001] The invention relates to the field of atomic absorption spectrophotometers, in particular to a deuterium lamp power supply control circuit of an atomic absorption spectrophotometer. Background technique [0002] A spectrophotometer is an instrument that uses spectrophotometry to quantitatively and qualitatively analyze substances. Spectrophotometry is a method for qualitative and quantitative analysis of the substance by measuring the absorbance of the substance under test at a specific wavelength or within a certain wavelength range. Commonly used wavelength ranges are: (1) 200-400nm ultraviolet region, (2) 400-760nm visible light region, (3) 2.5-25μm (4000cm<-1>~400cm<-1> by wave number) the infrared region. The instrument used is an ultraviolet spectrophotometer, a visible light spectrophotometer (or a colorimeter), an infrared spectrophotometer or an atomic absorption spectrophotometer. [0003] Atomic absorption spectrometry is a me...

AI Technical Summary

Problems solved by technology

In this way, the deuterium lamp has been inputting a constant voltage, and the working state cannot be changed. Long-term heating will definitely shorten the life of the deuterium lamp; at the same time, the heating frequency is low, which has a great impact on the background subtraction signal.

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