Deuterium lamp power supply used in DOAS technology

Abstract

The invention provides a deuterium lamp power supply used in a DOAS technology, and the power supply comprises a power supply starting and stopping control circuit which is used for controlling the starting and stopping of a flyback power supply and a BUCK preheating power supply; after the BUCK preheating power supply is switched on, the BUCK preheating power supply is used for preheating the deuterium lamp; and after the flyback power supply is switched on, the BUCK preheating power supply is stopped for supplying power to the deuterium lamp to finish lighting. According to the invention, the BUCK preheating power supply is adopted to control preheating of the deuterium lamp, the high-voltage starting power supply and the constant-current power supply are adopted, and the high-voltage starting and overvoltage protection control circuit is provided, so that the deuterium lamp operates continuously and stably, and the defect that the service life of the lamp is shortened is avoided; the preheating voltage and the preheating time of the deuterium lamp can be adjusted, a filament of the deuterium lamp can be preheated in an extremely short time, then the deuterium lamp can be quickly lightened and put into use, the high-voltage starting time can be adjusted, and the voltage and the current between an anode and a cathode of the deuterium lamp can be kept within a required stable range; the deuterium lamp power supply is suitable for various deuterium lamps.

Description

technical field [0001] The invention relates to the technical field of spectrum measurement equipment, in particular to a deuterium lamp power supply used in DOAS technology. Background technique [0002] Differential Absorption Spectroscopy (DOAS) is a relatively mature spectral measurement technology, which works in the visible and near-ultraviolet bands, and it can detect NO, HC and other gases in motor vehicle exhaust. DOAS technology is essentially based on the absorption of light radiation by molecules. Different molecules absorb light radiation differently, that is to say, different molecules have their own different absorption "fingerprints". When a beam of light passes through the atmosphere or a sample cell filled with the gas to be measured, the light will be selectively absorbed by the molecules in it, so that its intensity and structure will change, and it can be compared with the original spectrum. By analyzing the absorption spectrum, not only the existence o...

AI Technical Summary

Problems solved by technology

Because, without preheating, there is no electron cloud between the anode A and the cathode C of the deuterium lamp. Once the trigger voltage is applied, when the bulb is lit, the electrons on the cathode will go directly to the anode, and the collision force is large, which is easy to damage the anode. Bulb life shortened

Images