A common optical path of ultraviolet-visible-near-infrared dual light sources and its output method

Abstract

The invention provides an ultraviolet-visual-near infrared dual-light-source common light path and output method thereof. The ultraviolet-visual-near infrared dual-light-source common light path comprises an ellipsoidal reflection condensing mirror (1), a halogen tungsten lamp (2), a doublet lens (3), a back-through deuterium lamp (4) and a doublet lens (5), wherein the halogen tungsten lamp (2) is positioned at a focus F1 of the ellipsoidal reflection condensing mirror (1); light emitted by the halogen tungsten lamp (2) is gathered at another focus F2 of the ellipsoidal reflection condensing mirror (1); the focus F2 is an object focus of the doublet lens (3); the back-through deuterium lamp (4) is placed at an object surface focus of the doublet lens (5). By using the scheme, dual-light-source output of the ultraviolet, visual and near infrared light is realized through the back-through deuterium lamp and the halogen tungsten lamp; an optical element is fixed in position, the movement of the light source or the lens is not required to be controlled by using a motor, the structure is stable, the debugging is easy, and the measurement error caused by testing environment change due to movement of the light source is avoided.

Description

technical field [0001] The invention belongs to the technical field of a common optical path of ultraviolet, visible and near-infrared dual light sources, and in particular relates to a common optical path of ultraviolet, visible and near-infrared dual light sources and an output method thereof. Background technique [0002] Deuterium lamps and tungsten-halogen lamps are commonly used light sources for spectral analysis. The beam energy emitted by deuterium lamps is mainly concentrated between 200nm-400nm in wavelength, and the beam energy of tungsten-halogen lamps is mainly concentrated in the wavelength range of 400nm-1100nm. Deuterium lamps and tungsten-halogen lamps Combination of lamps can realize spectral analysis of materials in ultraviolet, visible, and near-infrared bands. The combined light source of deuterium lamp and tungsten halogen lamp is also widely used in UV-Vis spectrophotometer. [0003] "Modern Optical Metrology and Testing" (page 198-200, Beijing Unive...

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Problems solved by technology

Both of these solutions require the upper computer software to control the stepping motor to drive the optical components to move. Due to the error of machining assembly or the positioning error of the stepping motor, the repeated positioning accuracy is not good, resulting in poor connection of the instrument baseline, and the switching time of the light source is relatively long. Long, which is not conducive to the rapid measurement requirements of the instrument. The utility model patent "UV-Vis Spectrophotometer Lamp Changing Mechanism" (application number: 03208618.0) discloses a scheme for switching the light source by inserting a plane mirror between the deuterium lamp and the light source reflector , the plane mirror is installed on the swing rod, and the swing rod has two swing positions, one position is that the plane mirror blocks the light path of the deuterium lamp, and the light emitted by the halogen lamp is reflected by the plane mirror to the light source reflector and focused to the monochromator The second position is to move the plane mirror out of the optical path between the deuterium lamp and the light source reflector. The light emitted by the deuterium lamp is reflected by the light source reflector and focused on the incident slit of the monochromator. Although this solution does not need to The stepping of the stepping motor is used for positioning, but the motor is still required to provide power, and the optical components are easily affected by vibration during the movement process, and the structure is unstable

Whether it is by swinging the light source, or using a light source reflector or plane mirror to switch the light source, it is impossible to realize that the light emitted by the deuterium lamp and the tungsten halogen lamp enters the test light path at the same time in the optical path, and the optical components need to be moved to realize the light source switching. The structure is not good Stable, cumbersome to debug

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