High-speed dual-wavelength liquid-phase ultraviolet visible detector

Abstract

The utility model discloses a high-speed dual-wavelength liquid-phase ultraviolet visible detector, which comprises a structural bottom plate and an optical bottom plate mounted on the structural bottom plate. The color filter disc assembly is connected with the light source chamber; the monochromator assembly is connected with the color filter disc assembly, the monochromator assembly comprises a grating, a rotating platform and a stepping motor, the grating is arranged on the rotating platform, and the rotating platform is arranged at the driving end of the stepping motor; the flow cell sample holder assembly is connected with the monochromator assembly; the signal shielding assembly is mounted on one side of the monochromator assembly; wherein the monochromator assembly is connected with a signal acquisition system. The utility model has the beneficial effects that the detector is more stable, noise and index drift are reduced, the wavelength precision of an optical path is high, the wavelength repeatability is good, the wavelength moving speed is high, the installation consistency is good, and the maintenance is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to detection instrument technical field, concretely is a kind of high-speed dual-wavelength liquid phase ultraviolet visible detector. BACKGROUND

[0002] Dual-wavelength liquid phase ultraviolet visible detector can be switched to emit in very short time to two wavelengths with large phase difference, for measuring the absorption amount of compound under two different wavelengths, to obtain the solubility of compound. Therefore, it is more and more widely used in pharmaceutical, food, environment.

[0003] With the progress of science and technology, people's requirements for drugs, food and other products are also more and more strict, so for producers, it is necessary to strictly detect the products leaving factory to find the defects of products. Therefore, the requirements for the detector itself are also more and more strict, such as the detection limit, drift, repeatability of the detector, which are all factors to determine whether a detector can be accepted by the market.

[0004] Therefore, for those skilled in the art, it is an urgent technical problem to develop a detector with excellent detection limit, sensitive drift change and excellent repeatability. CONTENT OF UTILITY MODEL

[0005] The utility model aims at providing a kind of high-speed dual-wavelength liquid phase ultraviolet visible detector to solve the problems raised in the above background.

[0006] To achieve the above object, the utility model provides the following technical scheme: a kind of high-speed dual-wavelength liquid phase ultraviolet visible detector, including structure bottom plate and optical bottom plate installed on structure bottom plate, optical bottom plate is equipped with:

[0007] Light source chamber;

[0008] Color filter disc assembly, the color filter disc assembly is connected with the light source chamber;

[0009] Monochromator assembly, the monochromator assembly is connected with the color filter disc assembly, and the monochromator assembly includes grating, rotating platform and step motor, the grating is located on the rotating platform, and the rotating platform is located on the drive end of step motor;

[0010] Flow cell sample holder assembly, the flow cell sample holder assembly is connected with the monochromator assembly;

[0011] Signal shielding assembly, the signal shielding assembly is installed on one side of monochromator assembly;

[0012] Wherein, the monochromator assembly is connected with signal acquisition system.

[0013] Preferably, the light source chamber is made of aluminum alloy and is integrally closed, and the light source chamber is divided into two cavities, and a deuterium lamp and a tungsten lamp are arranged in the two cavities respectively.

[0014] Preferably, one side of the light source chamber is provided with an air inlet, and a fan is arranged on the optical bottom plate, and an air outlet of the fan corresponds to the air inlet.

[0015] Preferably, the sample flow cell rack assembly is provided with a sample rack and a metal flow cell, and a bending is arranged at the top end of the sample rack, and the metal flow cell is mounted on the bending through screws.

[0016] Preferably, the power supply assembly and the circuit board assembly are further included, the power supply assembly is arranged on an L-shaped support, the bottom end of the L-shaped support is connected with the optical bottom plate, and the circuit board assembly is arranged on the same side of the color filter disc assembly and the monochromator assembly.

[0017] Preferably, the circuit board assembly is provided with a separate communication interface.

[0018] Preferably, the signal acquisition system comprises two serially connected digital-to-analog converters and a data processing unit, the two digital-to-analog converters are connected with two data channels respectively, and the data processing unit is connected with the two digital-to-analog converters.

[0019] Preferably, the sampling speed of the digital-to-analog converter is 64 kHz.

[0020] Preferably, the optical bottom plate is made of an aluminum plate with a thickness of 1 cm, and the optical bottom plate and the structural bottom plate are connected in a three-point mode.

[0021] Compared with the prior art, the utility model has the advantages that:

[0022] 1、The light source chamber is made of aluminum alloy and is integrally closed, and the light source chamber is divided into two cavities, and a deuterium lamp and a tungsten lamp are arranged in the two cavities respectively, so that the heat of the deuterium lamp and the tungsten lamp can be quickly radiated outward through the cavities in the light source chamber and the fan, the light source chamber is kept at a suitable temperature, the detector is more stable, and the occurrence of noise and index drift is reduced.

[0023] 2、The monochromator is arranged, so that the wavelength precision of the light path is high, wavelength repeatability is good, and wavelength moving speed is fast.

[0024] 3、The sample flow cell rack assembly is installed with good consistency and is convenient to maintain. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 It is a structural schematic view of the utility model;

[0026] Fig. 2 It is a monochromator assembly schematic view of the utility model;

[0027] Fig. 3 A flow sample cell assembly schematic view of the utility model;

[0028] Fig. 4 A signal acquisition system schematic view of the utility model.

[0029] In the drawing: 1, structure bottom plate; 2, optical bottom plate; 3, light source chamber; 4, color filter disc assembly; 5, monochromator assembly; 51, grating; 52, rotating platform; 53, stepping motor; 6, flow sample cell rack assembly; 61, sample rack; 62, metal flow cell; 7, fan; 9, power supply assembly; 91, L-shaped support; 10, circuit board assembly. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0031] Please refer to Figs. 1 to 4 The utility model provides a technical scheme: a high-speed dual-wavelength liquid-phase ultraviolet visible detector, including structure bottom plate 1 and optical bottom plate 2 installed on structure bottom plate 1, is equipped with light source chamber 3, color filter disc assembly 4, monochromator assembly 5, flow cell sample rack assembly 6, signal shielding assembly 8 and signal acquisition system on optical bottom plate 2, color filter disc assembly 4 is connected with light source chamber 3, monochromator assembly 5 is connected with color filter disc assembly 4, flow cell sample rack assembly 6 is connected with monochromator assembly 5, monochromator assembly 5 is connected with signal acquisition system. Light path is sent out from light source chamber 3, the light of wavelength not required is filtered out by color filter disc assembly 4, so that the light path retains the light of specific wavelength, the light path continues to be shot into monochromator assembly 5, and after being reflected by monochromator assembly 5, enters flow cell sample rack assembly 6. In the utility model, the included angle of incident light path and emergent light path with the bottom edge of optical bottom plate 2 is less than or equal to 45 DEG, and the emergent light path is formed on the downside of incident light path.

[0032] In an embodiment of the utility model, light source chamber 3 is made of aluminum alloy integrated closed type, and light source chamber 3 is divided into two cavities, and deuterium lamp and tungsten lamp are arranged in the two cavities respectively. The heat generated by light source chamber 3 is absorbed by the whole aluminum alloy cavity and radiates heat to the outside, so as to reduce the temperature in light source chamber 3.

[0033] In an embodiment of the utility model, one side of light source chamber 3 is equipped with air inlet, fan 7 is equipped on optical bottom plate 2, the air outlet of fan 7 corresponds with air inlet, and the air duct formed by the rotation of fan 7 carries away the heat on the surface of cavity. In this way, the air flow disturbance of the air duct to the lamp chamber is avoided, the stability of the light source of the detector is improved, and the stability, noise, drift and other indexes of the instrument are guaranteed.

[0034] In an embodiment of the utility model, monochromator assembly 5 includes grating 51, rotating platform 52 and step motor 53, grating 51 is arranged on rotating platform 52, and rotating platform 52 is arranged on the driving end of step motor 53. Grating 51 is arranged on rotating platform 52 by sticking, and grating 71 is installed at the center position of rotating platform 52, that is, the vertical center line of grating 51 is aligned with the axis center line of the driving shaft of step motor 53, so that the rotation center of grating 51 is coincided with the shaft center of step motor 53. And the grating center height is consistent with the optical design center height. Step motor 53 is a high-resolution step motor driven by a subdivision driving circuit, which controls the angle of grating 51 to divide different wavelength monochromatic light. The monochromator of the utility model can bring the beneficial effects of high wavelength accuracy, good wavelength repeatability and fast wavelength moving speed.

[0035] The optical design center height in the application refers to the height of the optical center, which is the height from the installation center height of optical elements such as slit, grating, reflector and flow cell to the reference level of the bottom plate.

[0036] In an embodiment of the utility model, sample flow cell rack assembly 6 is equipped with sample rack 61 and metal flow cell 62, the top end of sample rack 61 is equipped with bend 63, and metal flow cell 62 is installed on the bend by screw. Specifically, sample rack 61 is integrally processed by aluminum alloy. Metal flow cell 62 is installed on sample rack 61, and then sample rack 61 is inserted into monochromator assembly 5 by using positioning pin, and is locked and fixed by using hand screw. The sample flow cell rack assembly 6 of the utility model has good installation consistency and is convenient to maintain.

[0037] In an embodiment of the utility model, signal shielding assembly 8 is installed on one side of monochromator assembly 5 to prevent electromagnetic interference of monochromator assembly 5.

[0038] In an embodiment of the utility model, the detector further includes power supply assembly 9 and circuit board assembly 10, power supply assembly 9 is arranged on L-shaped support 91, the bottom end of L-shaped support 91 is connected with optical bottom plate 2, and circuit board assembly 10 is arranged on the same side of color filter disc assembly 4 and monochromator assembly 5.

[0039] In one embodiment of the utility model, the circuit board assembly 10 is provided with a separate communication interface. The circuit board assembly 10 communicates with the mainboard using a connecting line. This facilitates structure installation and is convenient for maintenance.

[0040] In one embodiment of the utility model, the mainboard of the detector and the signal acquisition board are installed on the same bracket metal plate, and a shielding box is used for the signal acquisition board, and then the metal plate is installed on the structure bottom plate 1 by using screws. In this way, the mainboard, the signal acquisition board and the structure bottom plate 1 are co-located, the circuit anti-interference ability is improved, and the analog signal noise is reduced.

[0041] In one embodiment of the utility model, the signal acquisition system includes two serially connected digital-to-analog converters (ADC1 and ADC2) and a data processing unit (DSP / MCU), two digital-to-analog converters are connected to two data channels respectively, and the data processing unit is connected to the two digital-to-analog converters.

[0042] Specifically, the ADC1 is connected to the channel CH1, the ADC2 is connected to the channel CH2, the two channels are respectively used for collecting different signals, then the analog signals are converted into digital signals through respective analog-to-digital converters, and finally the digital signals are transmitted to the data processing unit for processing.

[0043] After the composite signal enters the channel CH1, it first passes through an analog-to-digital converter ADC1. The function of the analog-to-digital converter is to convert the input analog signal into a digital signal. The converted digital signal is transmitted to the data processing unit DSP / MCU through a line. At the same time, a synchronization signal SYNC is also generated and sent to the data processing unit, which is used to ensure the synchronous processing of data.

[0044] After the composite signal enters the channel CH2, it passes through the analog-to-digital converter ADC2 to convert the analog signal into a digital signal. The converted digital signal is transmitted to the data processing unit DSP / MCU through SPI (serial peripheral interface).

[0045] In one embodiment of the utility model, the sampling speed of the digital-to-analog converter is 64 kHz.

[0046] In one embodiment of the utility model, the optical bottom plate 2 is made of a 1CM thick aluminum plate to ensure the hardness and surface flatness of the optical platform. The optical bottom plate 2 and the structure bottom plate 1 are connected in a three-point mode. This connection mode can reduce the deformation of the structure bottom plate and affect the flatness of the optical bottom plate, and improve the stability of the optical path.

[0047] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high speed dual wavelength liquid phase UV-Vis detector comprising a structural base plate and an optical base plate mounted on the structural base plate, characterized in that, The optical base plate is provided with: a light source chamber; a color filter disc assembly connected with the light source chamber; a monochromator assembly connected with the color filter disc assembly, the monochromator assembly comprising a grating, a rotating platform and a stepping motor, the grating being arranged on the rotating platform, and the rotating platform being arranged on the driving end of the stepping motor; a flow cell sample holder assembly connected with the monochromator assembly; a signal shielding assembly installed on one side of the monochromator assembly; wherein the monochromator assembly is connected with a signal acquisition system.

2. The high-speed dual-wavelength liquid-phase UV-Vis detector according to claim 1, characterized in that: The light source chamber is made of aluminum alloy in an integrated closed manner, and the light source chamber is divided into two cavities, and a deuterium lamp and a tungsten lamp are arranged in the two cavities respectively.

3. The high-speed dual-wavelength liquid-phase UV-Vis detector according to claim 2, characterized in that: One side of the light source chamber is provided with an air inlet, and the optical base plate is provided with a fan, and the air outlet of the fan corresponds to the air inlet.

4. The high-speed dual-wavelength liquid-phase UV-Vis detector according to claim 3, characterized in that: The flow cell sample holder assembly is provided with a sample holder and a metal flow cell, the top end of the sample holder is provided with a bend, and the metal flow cell is installed on the bend through a screw.

5. The high-speed dual-wavelength liquid-phase UV-Vis detector according to claim 4, characterized in that: Further comprising a power supply assembly and a circuit board assembly, the power supply assembly is arranged on an L-shaped bracket, the bottom end of the L-shaped bracket is connected with the optical base plate, and the circuit board assembly is arranged on the same side of the color filter disc assembly and the monochromator assembly.

6. The high-speed dual-wavelength liquid-phase UV-Vis detector according to claim 5, characterized in that: The circuit board assembly is provided with a separate communication interface.

7. The high-speed dual-wavelength liquid-phase UV-Vis detector according to claim 1, characterized in that: The signal acquisition system comprises two series-connected digital-to-analog converters and a data processing unit, two digital-to-analog converters are connected with two data channels respectively, and the data processing unit is connected with the two digital-to-analog converters.

8. The high-speed dual-wavelength liquid-phase UV-Vis detector according to claim 7, characterized in that: The sampling speed of the digital-to-analog converter is 64 kHz.

9. The high-speed dual-wavelength liquid-phase UV-Vis detector according to claim 8, characterized in that: The optical base plate is made of 1CM thick aluminum plate, and the optical base plate and the structural base plate are connected in three-point mode.

Images