Ultraviolet detector optical subdivision device

Abstract

The invention belongs to the technical field of ultraviolet detectors, and particularly refers to an optical subdivision device for ultraviolet detectors, which includes a light source, a filter mirror, a reflective mirror, a concave grating, a half-transparent mirror, and a reference Compared with the photocell, the flow-through cell and the sample photocell, the light from the light source passes through the filter mirror, reflector, concave grating, and half-mirror in turn, and passes through the reference photocell, the flow-through cell, and the sample from the half-mirror respectively. The photocell, the groove grating is driven by a stepping motor to rotate, and an optocoupler block that rotates synchronously with the groove grating is set on the motor shaft, and an optocoupler is set on one side of the optocoupler block, and the optocoupler And the optocoupler block cooperates to detect the zero point of the optocoupler to realize the origin positioning of the groove grating; the invention overcomes the shortcomings of the existing detector optical unit, improves the stability of the instrument, optimizes the operation of the instrument, reduces the production cost of the instrument, and simplifies the installation of parts. quantity.

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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