Ultraviolet detector optical subdivision device

Abstract

The invention belongs to the technical field of ultraviolet detectors and in particular relates to an ultraviolet detector optical subdivision device. The device comprises a light source, a glass filter, a reflector, a concave grating, a half-transparent and half reflecting mirror, a reference photocell, a flow-through pool and a sample photocell which are arranged on a light path box body, wherein light of the light source sequentially passes through the glass filter, the reflector, the concave grating and the half-transparent and half reflecting mirror and respectively passes through the reference photocell, the flow-through pool and the sample photocell from the half-transparent and half reflecting mirror; the concave grating is driven to rotate by virtue of a stepping motor; an optical coupler stopper which synchronously rotates with the concave grating is arranged on the rotating shaft of the motor; an optical coupler is arranged on one side of the optical coupler stopper; and the optical coupler and the optical coupler stopper are matched with an optical coupler detection zero point to realize origin orientation of the concave grating during electrification each time. According to the device disclosed by the invention, the defects of optical units of the conventional detector are overcome, the stability of the instrument is improved, the operation of the instrument is optimized, the production cost of the instrument is reduced, and the number of parts is simplified.

Description

Technical field: [0001] The invention belongs to the technical field of ultraviolet detectors, in particular to an optical subdivision device of ultraviolet detectors. Background technique: [0002] In a traditional liquid chromatography instrument, a UV detector is generally equipped, including: a light source 1, a filter mirror 2, a mirror 3, a concave grating 4, a half-mirror 5, a reference photocell 6, and a flow-through cell 7 And sample photocell 8. It measures the change of the sample concentration by quickly recording the change of the absorbance of the mobile phase at a specific wavelength, so the optical unit is the core component of the instrument (see figure 1 ). Generally, the wavelength range required by chromatographic instruments is 200nm to 700nm, and the rotation angle of the grating is less than 30 degrees. Therefore, the traditional optical unit uses the mechanical structure of a sinusoidal screw to subdivide the rotation angle of the grating, and conve...

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Problems solved by technology

Although such a device realizes the subdivision of the optical path system, it has more unreliability. First, the structure uses more mechanical parts, such as screw rods, couplings, sinusoidal rods, screw racks, etc., so it is difficult for processing The requirements are very high; secondly, more parts are inefficient in the assembly process, and there are high requirements on the skill level of workers and tooling equipment. Therefore, the instruments that have been sold usually cannot be repaired on site and need to be returned to the factory. It brings a relatively large cost loss; thirdly, due to the certain error of the screw itself, usually only a relatively vague origin position is made. Therefore, it is necessary to detect the characteristic wavelength of the deuterium lamp every time it is turned on to achieve wavelength correction. , which is very detrimental to the convenience of using

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