CN211014015U - Portable visible spectrophotometer based on tunable liquid crystal filter - Google Patents
Portable visible spectrophotometer based on tunable liquid crystal filter Download PDFInfo
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- CN211014015U CN211014015U CN201921417190.1U CN201921417190U CN211014015U CN 211014015 U CN211014015 U CN 211014015U CN 201921417190 U CN201921417190 U CN 201921417190U CN 211014015 U CN211014015 U CN 211014015U
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Abstract
A portable visible spectrophotometer based on a tunable liquid crystal filter comprises a shell, L ED array light sources, a collimating lens, a liquid crystal tunable filter, a slit plate, a cell holder, a sample cell and a camera, wherein the shell is of a hollow structure in the central axis direction in the shell, and a light emitting section, a lens collimating section, a light splitting section, a sampling section and a camera section are sequentially formed, the L ED array light sources are arranged at one end of the light emitting section, the collimating lens is arranged in the lens collimating section, the liquid crystal tunable filter is arranged in the light splitting section, the slit plate is arranged on one side of an outlet of the liquid crystal tunable filter, the cell holder is fixedly connected with a bracket, the sample cell is arranged in the cell holder, and the camera is arranged in the camera section.
Description
Technical Field
The utility model relates to a spectroscopy measuring instrument field, especially a portable visible spectrophotometer based on tunable liquid crystal filter.
Background
The spectral analysis technology utilizes the characteristic absorption of the molecules of the substance to be measured on the light radiation to carry out qualitative and quantitative measurement, the basic principle of the spectral analysis technology obeys the Lambert-beer absorption law, namely, under a certain absorption optical path, the concentration of the substance is in direct proportion to the absorbance, and the information such as the component, the concentration and the like of the substance can be obtained by analyzing the absorption spectrum of the substance. Compared with the traditional substance concentration measurement method, the method has the advantages of no damage to sample components, simple and convenient operation, high sample measurement speed and the like, and is widely applied to the fields of chemical reagent concentration measurement, atmosphere toxic and harmful gas monitoring, water body monitoring and the like. The spectrophotometer is an instrument for detecting concentration based on spectral analysis technology, and mainly comprises a light source, a spectroscopic element, a sample cell, a detector, a processor and the like. After light emitted by the light source passes through the light splitting device, a linear light source with a specific wavelength is generated, then the linear light source penetrates through the sample, part of the linear light source is absorbed, absorption light intensity information is obtained through the detector, the light absorption value of the sample is calculated, and the concentration of the sample is calculated according to the Lambert-beer law. At present, a widely used visible spectrophotometer generally uses a halogen tungsten lamp as a light source, so that the energy consumption is large and the focusing structure is complex; the light splitting element is usually a grating or a prism, and is combined with a series of mechanical components to disperse light emitted by a light source, and the angle of the grating or the prism is changed to change the detection wavelength. The traditional spectrophotometer device is internally provided with a relatively complex machine and light path structure, has a large volume, is inconvenient to carry, has large power supply and is inconvenient for direct rapid measurement of field experiments.
The liquid crystal tunable technology is a novel interference type filtering technology based on nematic liquid crystal birefringence, and covers the wave band from visible light to near infrared wave band. Nematic liquid crystals are composed of rod-like molecules with a large aspect ratio, and the molecular centroids have no long-range order. The liquid crystal has accurate reaction to current, the long axis of liquid crystal molecules can be rotated by external voltage, the refractive indexes of o-ray e light with different wavelengths are further changed, the phase difference of the two changes along with the wavelength, and finally the spectral transmittance of the different wavelengths is changed through the interference of the o-ray e light, so that the wavelength modulation function is realized.
SUMMERY OF THE UTILITY MODEL
In order to solve the existing problems, the utility model discloses a portable visible spectrophotometer based on a tunable liquid crystal filter, which has the following specific technical scheme that the portable visible spectrophotometer based on the tunable liquid crystal filter comprises a shell, an L ED array light source, a collimating lens, a liquid crystal tunable filter, a slit plate, a cuvette frame, a sample cell and a camera;
the device comprises a shell, a light source, a collimating lens, a liquid crystal tunable filter, a slit plate, a cuvette frame, a sample cell and a camera component, wherein the shell is used for bearing L ED array light source, the collimating lens, the liquid crystal tunable filter, the slit plate, the cuvette frame, the sample cell and the camera component and fixing and limiting each component;
a light emitting section for fixing a light emitting source of the device;
l ED array light source, used as the light source when the device is used, arranged at one end of the light-emitting section, fixedly connected with the light-emitting section through a fastener, wherein the L ED array light source penetrates through one end of the shell, and the L ED array light source emits light to irradiate the inside of the collimating section of the lens;
the device comprises a light emitting section, a lens collimation section and a lens collimation section, wherein the light emitting section is used for emitting light rays irradiated by an L ED array light source;
the collimating lens is arranged in the lens collimating section, is embedded in a cavity of the lens collimating section, realizes clamping and fixing of the collimating lens and the lens collimating section, and is vertically arranged with the irradiation light of the L ED array light source;
the light splitting section is arranged at one end of the lens collimation section, the outer sides of two end ends of the light splitting section are of groove-shaped structures in the circumferential direction to form a light splitting section groove, and a convex block of the lens collimation section is embedded into the light splitting end groove at one end to realize the end-to-end splicing and fixing of the lens collimation section and the light splitting section;
the liquid crystal tunable filter is used as a light splitting element of the device and generates a line light source with a specific wavelength; the light splitting section is arranged in the light splitting section, is inserted into the light splitting section and is fixedly connected with the light splitting section through a fastener;
a slit plate for restricting stray light; the slit plate is arranged on one side of an outlet of the liquid crystal tunable filter, and the periphery of the slit plate is fixedly connected with the inner wall of the light splitting section; a slit is arranged in the center of the slit plate;
the sampling section is arranged at one end of the light splitting section, the cross section of the sampling section is of an L-shaped structure, the side edges of the sampling section are of lug-shaped structures to form a sampling section lug, the lug of the sampling section at one side is inserted into the groove of the light splitting section at one end to realize the end-to-end insertion connection of the sampling section and the light splitting section, the inner bottom surface of the sampling section is provided with a sampling section bottom block, the sampling section bottom block and the inner bottom surface of the sampling section are fixedly connected into an integral structure, the upper surface of the sampling section bottom block is provided with a bracket, the bottom end of the bracket is vertically and fixedly connected with the sampling section bottom block, the top ends of the two sides of the bracket are of convex structures to form a bracket lug;
the cuvette frame is used for supporting and fixing elements of the sample cell; the side plates are arranged on two sides of the bottom plate and symmetrically arranged, the side plate and the bottom plate are vertically and fixedly connected on each side, the side fixing block is arranged on the outer side of the side plate on each side and vertically and fixedly connected with the side plate, the bottom end of the side fixing block on each side is of a notch structure to form a side fixing block clamping groove, and the bracket lug is embedded into the side fixing block clamping groove to realize the fixation of the cell frame and the bracket;
the sample pool is used for loading a sample to be detected; the side plates are arranged in the cuvette frame, placed on the bottom plate and clamped by the side plates at two sides to realize fixing and limiting;
a camera section for fixing a camera; the camera section is arranged at one end of the sampling section, the camera section is of a cuboid structure, the outer edge of one end of the camera section is of a groove-shaped structure in the circumferential direction to form a camera section groove, and the convex block of the sampling section at one side is embedded into the camera section groove to realize the end-to-end plug connection of the sampling section and the camera section;
a camera for taking a grayscale image of the sample cell area; the camera fixing device is arranged in a camera section, the inner bottom surface of the camera section is of a groove-shaped structure to form a camera fixing groove, the bottom end of the camera is of a convex structure to form a camera limiting block, and the camera limiting block is embedded into the camera fixing groove to realize the fixed connection of the camera and the camera section; one end of the lens of the camera is arranged towards the sample cell.
Furthermore, the L ED array light source is vertical to the horizontal plane of the light-emitting section, and the cross-sectional area of the L ED array light source is smaller than that of the light-emitting section.
Further, the L ED array light source can adopt one of a white light L ED array or a sample characteristic absorption waveband L ED array to be tested.
Further, the shape and the size of the collimating lens are adapted to the shape and the size of the cross section of the light-emitting section.
Further, the collimating lens can be a fresnel lens.
Furthermore, the slit is arranged at the center of the slit plate and is of a rectangular structure.
Furthermore, the bracket is in an L-shaped structure, and a hollow structure is formed between the bracket and the bottom block of the sampling section.
Furthermore, a sample chamber cover is arranged on the top surface of the sampling section, and the side edge of the bottom surface of the sample chamber cover is of a convex block-shaped structure in the circumferential direction to form a convex block of the sample chamber cover; camera section top surface one side is equipped with the activity hinge, activity hinge one side with camera section top surface fixed connection, activity hinge opposite side with sample chamber cap one side fixed connection, one side the sample chamber cap through the activity hinge with the casing is realized rotating and is connected, through sample chamber cap lug card in the top side sampling section lug realizes the opposite side the sample chamber cap with the sampling section is fixed.
Further, the camera is one of a CMOS camera or a CCD camera.
Furthermore, the main optical axis of the collimating lens and the L ED array light source, the liquid crystal tunable filter, the slit, the sample cell and the camera center are all on the same horizontal axis.
The utility model has the advantages that:
(1) compared with the traditional concentration measurement method of chemical reagents, the visible spectrophotometer of the device utilizes the matching among the light source, the liquid crystal tunable filter, the cell holder and the camera, and obtains the concentration information of the sample to be measured by comparing the gray level image shot by the camera with the standard sample image; the device does not need to damage sample components, avoids complex operation flow, and has the advantages of simple and convenient operation, high sample measuring speed and the like.
(2) Compared with the traditional spectrophotometer, the device adopts L ED array light sources to replace traditional halogen tungsten lamps as light sources, avoids the use of halogen tungsten lamps to cause larger energy consumption, has a complex focusing structure, adopts L ED lamps to cause low energy consumption, has small volume and is safer, adopts a liquid crystal tunable filter to replace light splitting elements in the matching form of components such as gratings or prisms and the like compared with the traditional light splitting elements, has the advantages of high light splitting speed, small volume, no mechanical vibration elements and the like, and has higher detection sensitivity in a differential absorption spectrum mode of the device.
(3) The cell frame of single groove or multislot form can be replaced according to the survey requirement to the sample cell of this device, and the cell frame that adopts the multislot form can shorten the sampling required time greatly, is favorable to surveying appearance in batches fast, and instrument design modularization can realize dismantling fast, change the cell frame, and it is very convenient to operate.
(4) The device has the characteristics of miniaturization and light weight, is portable and easy to operate, can continuously operate electrical components in the device for a long time in a special environment without external power supply, is more suitable for field experiment scenes, and is flexible in application range.
Drawings
Fig. 1 is a schematic diagram of the internal structure of the present invention.
Fig. 2 is an integrated structural view of the light emitting section and the lens collimating section of the present invention.
Fig. 3 is an integrated structure view of the beam splitting section and the slit plate of the present invention.
Fig. 4 is a schematic structural diagram of the sampling section of the present invention.
Fig. 5 is a structural view of the cell holder according to embodiment 1 of the present invention.
Fig. 6 is a structural view of the cell holder according to embodiment 2 of the present invention.
Fig. 7 is a structural view of the camera section of the present invention.
The reference signs list comprises a shell 1, a light-emitting section 1-1, a lens collimation section 1-2, a lens collimation section bump 1-21, a light splitting section 1-3, a light splitting section groove 1-31, a sampling section 1-4, a sampling section bump 1-41, a sampling section bottom block 1-42, a bracket 1-43, a bracket bump 1-44, a sample chamber cover 1-45, a sample chamber cover bump 1-46, a movable hinge 1-47, a camera section 1-5, a camera section groove 1-51, a wire casing 1-52, a camera fixing groove 1-53, a L ED array light source 2, a collimation lens 3, a liquid crystal tunable filter 4, a slit plate 5, a slit 5-1, a cuvette frame 6, a bottom plate 6-1, a side plate 6-2, a side fixing block 6-3, a fixing block slot 6-31, a clapboard 6-4, a sample cell 7, a camera 8 and a camera limiting block 8-1.
Detailed Description
For making the technical scheme of the utility model clear more clearly and definitely, it is right to combine the drawing below the utility model discloses further describe, any is right the utility model discloses technical scheme's technical characteristic carries out the scheme that equivalent replacement and conventional reasoning reachs and all falls into the utility model discloses protection scope. The fixed connection, the fixed arrangement and the fixed structure mentioned in the embodiment are known technologies known by those skilled in the art, such as gluing, 3D printing and integral forming.
Example 1
With reference to the attached drawings, the portable visible spectrophotometer based on the tunable liquid crystal filter comprises a shell, an L ED array light source, a collimating lens, a liquid crystal tunable filter, a slit plate, a cuvette frame, a sample cell and a camera;
the device comprises a shell, a light source, a collimating lens, a liquid crystal tunable filter, a slit plate, a cuvette frame, a sample cell and a camera component, wherein the shell is used for bearing L ED array light source, the collimating lens, the liquid crystal tunable filter, the slit plate, the cuvette frame, the sample cell and the camera component and fixing and limiting each component;
a light emitting section for fixing a light emitting source of the device;
l ED array light source, used as the light source when the device is used, arranged at one end of the light-emitting section, fixedly connected with the light-emitting section through a fastener, wherein the L ED array light source penetrates through one end of the shell, and the L ED array light source emits light to irradiate the inside of the collimating section of the lens;
the device comprises a light emitting section, a lens collimation section and a lens collimation section, wherein the light emitting section is used for emitting light rays irradiated by an L ED array light source;
the collimating lens is arranged in the lens collimating section, is embedded in a cavity of the lens collimating section, realizes clamping and fixing of the collimating lens and the lens collimating section, and is vertically arranged with the irradiation light of the L ED array light source;
the light splitting section is arranged at one end of the lens collimation section, the outer sides of two end ends of the light splitting section are of groove-shaped structures in the circumferential direction to form a light splitting section groove, and a convex block of the lens collimation section is embedded into the light splitting end groove at one end to realize the end-to-end splicing and fixing of the lens collimation section and the light splitting section;
the liquid crystal tunable filter is used as a light splitting element of the device and generates a line light source with a specific wavelength; the light splitting section is arranged in the light splitting section, is inserted into the light splitting section and is fixedly connected with the light splitting section through a fastener;
a slit plate for restricting stray light; the slit plate is arranged on one side of an outlet of the liquid crystal tunable filter, and the periphery of the slit plate is fixedly connected with the inner wall of the light splitting section; a slit is arranged in the center of the slit plate;
the sampling section is arranged at one end of the light splitting section, the cross section of the sampling section is of an L-shaped structure, the side edges of the sampling section are of lug-shaped structures to form a sampling section lug, the lug of the sampling section at one side is inserted into the groove of the light splitting section at one end to realize the end-to-end insertion connection of the sampling section and the light splitting section, the inner bottom surface of the sampling section is provided with a sampling section bottom block, the sampling section bottom block and the inner bottom surface of the sampling section are fixedly connected into an integral structure, the upper surface of the sampling section bottom block is provided with a bracket, the bottom end of the bracket is vertically and fixedly connected with the sampling section bottom block, the top ends of the two sides of the bracket are of convex structures to form a bracket lug;
the cuvette frame is used for supporting and fixing elements of the sample cell; the side plates are arranged on two sides of the bottom plate and symmetrically arranged, the side plate and the bottom plate are vertically and fixedly connected on each side, the side fixing block is arranged on the outer side of the side plate on each side and vertically and fixedly connected with the side plate, the bottom end of the side fixing block on each side is of a notch structure to form a side fixing block clamping groove, and the bracket lug is embedded into the side fixing block clamping groove to realize the fixation of the cell frame and the bracket;
the sample pool is used for loading a sample to be detected; the side plates are arranged in the cuvette frame, placed on the bottom plate and clamped by the side plates at two sides to realize fixing and limiting;
a camera section for fixing a camera; the camera section is arranged at one end of the sampling section, the camera section is of a cuboid structure, the outer edge of one end of the camera section is of a groove-shaped structure in the circumferential direction to form a camera section groove, and the convex block of the sampling section at one side is embedded into the camera section groove to realize the end-to-end plug connection of the sampling section and the camera section;
a camera for taking a grayscale image of the sample cell area; the camera fixing device is arranged in a camera section, the inner bottom surface of the camera section is of a groove-shaped structure to form a camera fixing groove, the bottom end of the camera is of a convex structure to form a camera limiting block, and the camera limiting block is embedded into the camera fixing groove to realize the fixed connection of the camera and the camera section; one end of the lens of the camera is arranged towards the sample cell.
Furthermore, the L ED array light source is vertical to the horizontal plane of the light-emitting section, and the cross-sectional area of the L ED array light source is smaller than that of the light-emitting section.
Further, the L ED array light source can adopt one of a white light L ED array or a sample characteristic absorption waveband L ED array to be tested.
Further, the shape and the size of the collimating lens are adapted to the shape and the size of the cross section of the light-emitting section.
Further, the collimating lens can be a fresnel lens.
Furthermore, the slit is arranged at the center of the slit plate and is of a rectangular structure.
Furthermore, the bracket is in an L-shaped structure, and a hollow structure is formed between the bracket and the bottom block of the sampling section.
Furthermore, a sample chamber cover is arranged on the top surface of the sampling section, and the side edge of the bottom surface of the sample chamber cover is of a convex block-shaped structure in the circumferential direction to form a convex block of the sample chamber cover; camera section top surface one side is equipped with the activity hinge, activity hinge one side with camera section top surface fixed connection, activity hinge opposite side with sample chamber cap one side fixed connection, one side the sample chamber cap through the activity hinge with the casing is realized rotating and is connected, through sample chamber cap lug card in the top side sampling section lug realizes the opposite side the sample chamber cap with the sampling section is fixed.
Further, the camera is one of a CMOS camera or a CCD camera.
Furthermore, the main optical axis of the collimating lens and the L ED array light source, the liquid crystal tunable filter, the slit, the sample cell and the camera center are all on the same horizontal axis.
Example 2
The structure principle of the utility model is that:
when the device is used and assembled, a sample cell containing a sample to be detected is placed in a cell holder, the cell holder and a bracket are clamped and fixed through clamping and clamping of side plates on two sides, a light emitting section, a lens collimation section, a light splitting section, a sampling section and a camera section are sequentially subjected to ending and inserting to realize fixing, a sample cell cover is turned over to enable the sample cell cover to cover the top surface of the sampling section, then an L ED array light source is opened, emitted light passes through the light emitting section, is collimated through a collimating lens and then is directly projected into a liquid crystal tunable filter through the lens collimation section, monochromatic light with specified wavelength is transmitted through control of electric fields generated by different voltages to a liquid crystal, the monochromatic light passes through a slit to irradiate the sample cell, at the moment, a camera shoots a gray level image of a sample cell area, and finally the gray level image is compared with a standard sample image to obtain concentration information of the.
The software control and use steps of the device comprise (1) equipment connection is carried out between upper computer software and a lower computer, instrument connection function codes (C # codes) are sent by using the upper computer software (L beyond codes), and ConnectDevice functions are called, and meanwhile, the upper computer software calls equipment search to complete connection of the liquid crystal tunable filter and the camera.
(2) And confirming the connection state of the upper computer and the liquid crystal tunable filter. The upper computer sends a function code for setting square wave frequency by utilizing a GetSetFrequencyCmd protocol so as to set the working square wave frequency of the liquid crystal, checks and returns a data packet, and confirms whether the liquid crystal tunable filter completes the operation or not.
(3) The upper computer calls a mapping database of wavelength and voltage by using a SetWave L ength function so as to obtain a voltage value under a specific wavelength, sends a function code for setting the liquid crystal voltage, and calls a GetSetVoltageCmd function so as to obtain a data packet for setting the channel voltage, thereby completing the setting of the specific wavelength.
(4) And the upper computer checks the wavelength of the given liquid crystal tunable filter again, and the control filter is programmed in L abview to scan a visible wave band of the sample or detect the wavelength.
(5) Calling controls such as VISION in L overview to control the camera, calling the camera to synchronously acquire image data, and performing region positioning, region segmentation and gray scale calculation on a sample part in the picture by combining a template matching algorithm.
(6) And finally, obtaining the concentration of the sample to be detected according to the Lambert beer law: lambert beer's law a lgI0I ═ lg1/T ═ cl, where a is the absorbance, I0Is the incident light intensity, I is the emergent light intensity, is the molar absorption coefficient, c is the sample concentration, and l is the absorption optical path. The intensity of the absorbed light can be deducedRelation with concentration c ═ lg (I)0I) × l, because the gray value of the collected image is positively correlated with the light intensity, the concentration of the sample can be quickly obtained by calculating the gray value of the specific area of the picture and comparing the gray value with the standard sample image.
The utility model has the advantages that:
(1) compared with the traditional concentration measurement method of chemical reagents, the visible spectrophotometer of the device utilizes the matching among the light source, the liquid crystal tunable filter, the cell holder and the camera, and obtains the concentration information of the sample to be measured by comparing the gray level image shot by the camera with the standard sample image; the device does not need to damage sample components, avoids complex operation flow, and has the advantages of simple and convenient operation, high sample measuring speed and the like.
(2) Compared with the traditional spectrophotometer, the device adopts L ED array light sources to replace traditional halogen tungsten lamps as light sources, avoids the use of halogen tungsten lamps to cause larger energy consumption, has a complex focusing structure, adopts L ED lamps to cause low energy consumption, has small volume and is safer, adopts a liquid crystal tunable filter to replace light splitting elements in the matching form of components such as gratings or prisms and the like compared with the traditional light splitting elements, has the advantages of high light splitting speed, small volume, no mechanical vibration elements and the like, and has higher detection sensitivity in a differential absorption spectrum mode of the device.
(3) The cell frame of single groove or multislot form can be replaced according to the survey requirement to the sample cell of this device, and the cell frame that adopts the multislot form can shorten the sampling required time greatly, is favorable to surveying appearance in batches fast, and instrument design modularization can realize dismantling fast, change the cell frame, and it is very convenient to operate.
(4) The device has the characteristics of miniaturization and light weight, is portable and easy to operate, can continuously operate electrical components in the device for a long time in a special environment without external power supply, is more suitable for field experiment scenes, and is flexible in application range.
Claims (10)
1. A portable visible spectrophotometer based on a tunable liquid crystal filter is characterized by comprising a shell, an L ED array light source, a collimating lens, a liquid crystal tunable filter, a slit plate, a cuvette frame, a sample cell and a camera;
the device comprises a shell, a light source, a collimating lens, a liquid crystal tunable filter, a slit plate, a cuvette frame, a sample cell and a camera component, wherein the shell is used for bearing L ED array light source, the collimating lens, the liquid crystal tunable filter, the slit plate, the cuvette frame, the sample cell and the camera component and fixing and limiting each component;
a light emitting section for fixing a light emitting source of the device;
l ED array light source, used as the light source when the device is used, arranged at one end of the light-emitting section, fixedly connected with the light-emitting section through a fastener, wherein the L ED array light source penetrates through one end of the shell, and the L ED array light source emits light to irradiate the inside of the collimating section of the lens;
the light source device comprises a light emitting section, a lens collimation section and a light source module, wherein the light emitting section is used for emitting light rays emitted by an L ED array light source;
the collimating lens is arranged in the lens collimating section, is embedded in a cavity of the lens collimating section, realizes clamping and fixing of the collimating lens and the lens collimating section, is vertically arranged with the illuminating light of the L ED array light source, and has a lens focal length equal to the distance from the L ED array light source;
the light splitting section is arranged at one end of the lens collimation section, the outer sides of two end ends of the light splitting section are of groove-shaped structures in the circumferential direction to form light splitting section grooves, and convex blocks of the lens collimation section are embedded into the grooves at one end of the light splitting section to realize the end-to-end splicing and fixing of the lens collimation section and the light splitting section;
the liquid crystal tunable filter is used as a light splitting element of the device and generates a line light source with a specific wavelength; the light splitting section is arranged in the light splitting section, is inserted into the light splitting section and is fixedly connected with the light splitting section through a fastener;
a slit plate for restricting stray light; the slit plate is arranged on one side of an outlet of the liquid crystal tunable filter, and the periphery of the slit plate is fixedly connected with the inner wall of the light splitting section; a slit is arranged in the center of the slit plate;
the sampling section is arranged at one end of the light splitting section, the cross section of the sampling section is of an L-shaped structure, the side edges of the sampling section are of lug-shaped structures to form a sampling section lug, the lug of the sampling section at one side is inserted into the groove of the light splitting section at one end to realize the end-to-end insertion connection of the sampling section and the light splitting section, the inner bottom surface of the sampling section is provided with a sampling section bottom block, the sampling section bottom block and the inner bottom surface of the sampling section are fixedly connected into an integral structure, the upper surface of the sampling section bottom block is provided with a bracket, the bottom end of the bracket is vertically and fixedly connected with the sampling section bottom block, the top ends of the two sides of the bracket are of convex structures to form a bracket lug;
the cuvette frame is used for supporting and fixing elements of the sample cell; the side plates are arranged on two sides of the bottom plate and symmetrically arranged, the side plate and the bottom plate are vertically and fixedly connected on each side, the side fixing block is arranged on the outer side of the side plate on each side and vertically and fixedly connected with the side plate, the bottom end of the side fixing block on each side is of a notch structure to form a side fixing block clamping groove, and the bracket lug is embedded into the side fixing block clamping groove to realize the fixation of the cell frame and the bracket;
the sample pool is used for loading a sample to be detected; the side plates are arranged in the cuvette frame, placed on the bottom plate and clamped by the side plates at two sides to realize fixing and limiting;
a camera section for fixing a camera; the camera section is arranged at one end of the sampling section, the camera section is of a cuboid structure, the outer edge of one end of the camera section is of a groove-shaped structure in the circumferential direction to form a camera section groove, and the convex block of the sampling section at one side is embedded into the camera section groove to realize the end-to-end plug connection of the sampling section and the camera section;
a camera for taking a grayscale image of the sample cell area; the camera fixing device is arranged in a camera section, the inner bottom surface of the camera section is of a groove-shaped structure to form a camera fixing groove, the bottom end of the camera is of a convex structure to form a camera limiting block, and the camera limiting block is embedded into the camera fixing groove to realize the fixed connection of the camera and the camera section; one end of the lens of the camera is arranged towards the sample cell.
2. The tunable liquid crystal filter-based portable visible spectrophotometer of claim 1, wherein said L ED array light sources are perpendicular to the horizontal plane of the light emitting section, and the cross-sectional area of said L ED array light sources is smaller than the size of the cross-sectional area of said light emitting section.
3. The portable visible spectrophotometer based on tunable liquid crystal filter of claim 1, wherein the L ED array light source can be one of white light L ED array or sample characteristic absorption band L ED array.
4. The portable visible spectrophotometer based on tunable liquid crystal filter according to claim 1, wherein the shape and size of the collimating lens is adapted to the cross-sectional shape and size of the light emitting section.
5. The portable visible spectrophotometer based on tunable liquid crystal filter according to claim 1 or 4, wherein the collimating lens is a Fresnel lens.
6. The portable visible spectrophotometer based on tunable liquid crystal filter, according to claim 1, wherein said slit is disposed at a center position of said slit plate, said slit has a rectangular structure.
7. The portable visible spectrophotometer based on tunable liquid crystal filter, according to claim 1, wherein said bracket is shaped like "L", and a hollow structure is formed between said bracket and said bottom block of sampling section.
8. The portable visible spectrophotometer based on the tunable liquid crystal filter according to claim 1, wherein a partition plate is further disposed on the bottom plate of the cell holder, the partition plate is disposed at a central position of the upper surface of the bottom plate and between the side plates at two sides, and the partition plate and the bottom plate are vertically and fixedly connected to form an integrated structure.
9. The portable visible spectrophotometer based on tunable liquid crystal filter according to claim 1, wherein the top surface of the sampling section is provided with a sample chamber cover, the side edge of the bottom surface of the sample chamber cover is in a projection-like structure along the circumferential direction, forming a sample chamber cover projection; camera section top surface one side is equipped with the activity hinge, activity hinge one side with camera section top surface fixed connection, activity hinge opposite side with sample chamber cap one side fixed connection, one side of sample chamber cap through the activity hinge with the casing is realized rotating and is connected, through sample chamber cap lug card in the top side of sampling section lug realizes the sample chamber cap with the sampling section is fixed.
10. The portable visible spectrophotometer based on tunable liquid crystal filter of claim 1, wherein the main optical axis of the collimating lens is on the same horizontal axis with L ED array light source, liquid crystal tunable filter, slit, sample cell, camera center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921417190.1U CN211014015U (en) | 2019-08-29 | 2019-08-29 | Portable visible spectrophotometer based on tunable liquid crystal filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921417190.1U CN211014015U (en) | 2019-08-29 | 2019-08-29 | Portable visible spectrophotometer based on tunable liquid crystal filter |
Publications (1)
| Publication Number | Publication Date |
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| CN211014015U true CN211014015U (en) | 2020-07-14 |
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