Automatic disc light rotating instrument

Abstract

The utility model discloses an automatic disc light rotating instrument. A base, a camera, a camera support, a stepping motor, a coaxial device, a stepping motor driver, a wiring serial port and a controller are installed on an existing polarimeter. According to the utility model, by introducing the camera and the image processing technology, automatic identification and accurate measurement of the trisection view field in the eyepiece of the polarimeter are realized; the stepping motor and the dial are coaxially mounted through the coaxial device, so that the step number of the stepping motor is consistent with the rotation angle of the dial, the rotation angle of the dial is accurately controlled, the accuracy and efficiency of measurement are remarkably improved, personal errors are reduced, and the measurement precision is improved; the device disclosed by the utility model has the remarkable technical effects and progress of high precision, automation, simplicity and convenience in operation and the like, provides a new thought and solution for scientific research and technical application in the fields of chemical analysis, biological pharmacy and the like, and has wide market application prospect and industrialization value.

Description

TECHNICAL FIELD

[0001] The utility model relates to polarimeter technology, concretely relates to an automatic disc polarimeter. BACKGROUND

[0002] Polarimeter is an important analytical instrument, it determines the concentration, content and purity of matter accurately through measuring the optical rotation, and is widely used in pharmaceutical, sugar, food, chemical industry and other industries to analyze the properties and quality of matter, and is also used in chemical industry, hospital, higher learning institution and scientific research unit for chemical analysis and chemical kinetics monitoring. The working principle of disc polarimeter is based on polarized light, and the method of rotating the polarized plane of polarized light is used to achieve the measurement purpose. When the light beam passes through the optical rotation matter, the polarized plane is rotated by an angle, the polarized plane of the analyzer is rotated by the same angle in the same direction, then the field illumination can be equalized, at this time, the angle of rotation of the analyzer is the optical rotation of the optical rotation matter.

[0003] As shown in Figure 1 , the existing polarimeter comprises a base, a light source, a polarizer, a half-wave plate, a lens barrel, a reading magnifying lens, an analyzer, a degree disc and a vernier, an ocular lens, a focusing screw and a degree disc rotating handle; wherein the light source and the lens barrel are arranged on the base respectively, and the light source is located at one end of the lens barrel; the polarizer, the half-wave plate and a sample tube are located in the lens barrel; the analyzer, the degree disc and the ocular lens are arranged at the other end of the lens barrel, the degree disc is coaxial with the lens barrel, and the vernier is arranged on the degree disc to read the degree disc; the degree disc rotating handle is connected to the degree disc to drive the degree disc and the analyzer to rotate; the focusing screw is connected to the ocular lens to adjust the focal length of the ocular lens; the reading magnifying lens is arranged on the periphery of the ocular lens to read the degree disc reading. When there is no optical rotation solution in the sample tube, the analyzer is adjusted to be perpendicular to the polarizer, at this time, a full dark field is observed from the ocular lens, which is taken as the zero point of the degree disc, as shown in Figure 2 (a), the three-part field disappears and the field is relatively dark, which is called zero field. When the optical rotation matter is put into the sample tube and put into the lens barrel for measurement, since the solution has optical rotation, the plane polarized light is rotated by an angle, through the analysis of the analyzer, a three-part field with different illumination is observed from the ocular lens, which is called three-part field, such as Figure 2 (b) or (d), the three-part field has three parts and the middle part is dark and the left and right parts are bright in Figure 2 (b), the three-part field has three parts and the middle part is dark and the left and right parts are bright in Figure 2 (d). The degree disc rotating handle is rotated to drive the degree disc and the analyzer to rotate, and a full dark or full bright field with uniform illumination can be found, as shown in Figure 2 (a) or (c), the three-part field disappears and the field is relatively bright in Figure 2 (c). When the full dark field is observed, as shown in Figure 2As shown in (a) of FIG. 1, the angle of the degree disc rotation is read from the degree disc through a reading magnifying glass. Figure 2 As shown in (e) of FIG. 1, the optical rotation of the solution is obtained.

[0004] The field of view of the existing disc polarimeter is observed by the human eye observing the light of a sodium light lamp or other wavelength light source, and long-term observation can cause visual fatigue of the human eye. The graduation value of the degree disc is very fine, and manual reading is prone to reading errors, and the degree disc is prone to corrosion and cannot be clearly observed. When the angle of the analyzer is adjusted by the adjusting disc, the adjustment is manual and cannot be precisely adjusted. Content of the utility model

[0005] In view of the deficiencies of the prior art, the utility model provides an automatic disc polarimeter, which replaces the ocular lens by a camera, and photographs the field of view change in the ocular lens of the polarimeter; then, the video or image photographed is processed by using image processing technology, and three-part fields of view (bright-bright field of view, uniform dark field and dark-bright field of view) are recognized; the stepping motor is coaxial with the center of the degree disc of the polarimeter, so that the number of steps and the rotation angle are directly corresponding; the rotation angle of the stepping motor is controlled, so that the optical rotation of the measured solution can be accurately measured; at the same time, the dynamic process of the experiment can be monitored in real time, and relevant data can be automatically collected, thereby providing strong support for solution reaction kinetics research.

[0006] The automatic disc polarimeter comprises a base, a light source, a polarizer, a half-wave plate, a lens barrel, a reading magnifying glass, an analyzer, a degree disc and a vernier, an ocular lens, a focusing screw and a degree disc rotating handle; wherein the light source and the lens barrel are arranged on the base, and the light source is located at one end of the lens barrel; the polarizer, the half-wave plate and a sample tube are located in the lens barrel; the analyzer, the degree disc and the ocular lens are arranged at the other end of the lens barrel, the degree disc is coaxial with the lens barrel, and the degree disc is provided with a vernier for reading the degree disc; the degree disc rotating handle is connected to the degree disc to drive the degree disc and the analyzer to rotate; the focusing screw is connected to the ocular lens to adjust the focal length of the ocular lens; the reading magnifying glass is arranged on the periphery of the ocular lens to read the reading of the degree disc; further comprising a base, a camera, a camera support, a stepping motor, a coaxial device, a stepping motor driver, a wiring serial port and a controller; wherein the camera support and the base are respectively mounted on the base, the camera is mounted at the top end of the camera support, the height and the pitch angle of the camera are adjusted by the camera support, the camera is located at one end of the lens barrel provided with the ocular lens, and the camera is used for photographing the field of view change in the ocular lens; the stepping motor is coaxially arranged with the degree disc through the coaxial device, so that the number of steps of the stepping motor is consistent with the rotation angle of the degree disc, thereby accurately controlling the rotation angle of the degree disc; the stepping motor is connected to the stepping motor driver, the stepping motor driver is connected to the controller, the stepping motor is driven by the controller to drive the degree disc to coaxially rotate, and the controller and the camera are respectively connected to a working computer through the wiring serial port.

[0007] When there is no optically active solution in the sample tube, the camera captures the video or image of the field of view of the polarimeter through the lens barrel and transmits it to the working computer; the working computer controls the motor driver to drive the stepper motor to rotate the coaxial disc and the polarizer through the controller, and the number of steps of the stepper motor corresponds to the rotation angle of the polarizer accurately, and the rotation of the polarizer makes the full dark field observed from the transmitted image as the zero point of the disc, at this time the field of view is called the zero position field of view; the sample tube containing the optically active substance is put into the lens barrel for measurement, and the optical activity of the solution rotates the plane polarized light by an angle, which is analyzed by the polarizer, and the camera captures the video or image of the field of view at this time and transmits it to the working computer; the working computer sees the three-part field of view with different illuminations, that is, the middle light and the left and right dark or the middle dark and the left and right light, and the working computer controls the motor driver to drive the stepper motor to rotate the coaxial disc and the polarizer through the controller, and the number of steps of the stepper motor corresponds to the rotation angle of the disc, so that the number of steps of the stepper motor corresponds to the rotation angle of the polarizer, and the stepper motor drives the disc and the polarizer, and adjusts the camera image to be a full dark field, and the number of steps of the stepper motor is obtained. The angle of rotation of the polarizer, that is, the optical activity of the solution, so as to realize the automatic recognition and accurate measurement of the optical activity of the solution.

[0008] The base provides stable support for the entire polarimeter, and is rectangular in shape, and is provided with a positioning hole and a plurality of uniformly distributed supporting legs at the bottom, so as to facilitate positioning of the camera and movement and stability of the polarimeter.

[0009] The camera replaces the traditional eyepiece and is used for shooting the change of the field of view in the eyepiece of the polarimeter. The camera does not need to have high resolution and only needs general response capability, and does not use automatic exposure function, so as to ensure that the change of the three-part field of view can be accurately captured.

[0010] The camera support includes an adjustable lifting support rod and a universal gimbal, wherein the bottom of the adjustable lifting support rod is fixed on the upper surface of the base, the adjustable lifting support rod can adjust the height in the axial direction, the universal gimbal is arranged at the top of the adjustable lifting support rod, the universal gimbal can adjust the pitch angle, and the camera is installed on the universal gimbal, so that the height of the camera is adjusted through the adjustable lifting support rod, the pitch angle of the camera is adjusted through the universal gimbal, and the shooting field of view of the camera is adjusted.

[0011] Further, the utility model further includes motor support and fixed screw, adopts fixed screw to make stepper motor pass through motor support firm on base, through install coaxial device connect stepper motor's motor shaft with disc, motor support makes stepper motor's motor shaft with disc coaxial, tighten fixed screw makes stepper motor with disc coaxial rotation.

[0012] Further, the utility model further includes a voltage stabilizing power supply connected to the controller and the stepper motor driver.

[0013] The torque of the stepping motor is 0.2-0.8 Nm.

[0014] The utility model has the advantages of:

[0015] The utility model has the advantages of high precision, automation and simple operation, provides a new thought and solution scheme for scientific research and technical application in the fields of chemical analysis and biopharmaceuticals, and has wide market application prospect and industrialization value.

[0016] The utility model discloses a camera and image processing technology are introduced, realize the automatic identification and accurate measurement to the three field of view in the eyepiece of polarimeter, this technical feature has improved the accuracy and efficiency of measurement, compared with traditional manual observation and manual adjustment, reduced the human error, improved the measurement precision.

[0017] Multifunctionality and flexibility: the utility model not only has the ability of static measurement of the optical rotation, but also can carry out the automatic dynamic measurement of solution reaction kinetics, so that the automatic disc polarimeter has more extensive application prospect in the fields of chemical analysis, biopharmaceuticals and food detection, and can satisfy different needs of different users. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the schematic diagram of the existing polarimeter;

[0019] Figure 2 It is the schematic diagram of the field of view of the polarimeter, wherein (a)-(d) are different three field of view diagrams respectively, and (e) is the reading schematic diagram of the degree disc and the vernier;

[0020] Figure 3 It is the schematic diagram of one embodiment of the automatic disc polarimeter of the utility model. DETAILED DESCRIPTION

[0021] The utility model will be further described in combination with the specific embodiments and the drawings.

[0022] As Figure 3As shown, the automatic disc polarimeter of the embodiment further comprises a base, a camera, a camera support, a stepper motor, a coaxial device, a motor support, a fixing screw, a stepper motor driver, a wiring serial port, a controller and a stabilized power supply; wherein the camera support and the base are respectively mounted on the base, the camera is mounted on the top end of the camera support, the height and the pitch angle of the camera are adjusted through the camera support, the camera is mounted on one end of the objective lens barrel to make the camera fit the objective lens, the camera is used for shooting the field of view in the objective lens; the stepper motor is stably fixed on the base through the motor support by the fixing screw; the motor shaft is coaxial with the degree disc through the coaxial device, the stepper motor is coaxial with the degree disc through the fixing screw, the number of steps of the stepper motor is consistent with the rotation angle of the degree disc through the coaxial installation, so that the rotation angle is accurately controlled; the stepper motor is connected to the stepper motor driver, the stepper motor driver is connected to the controller, the stepper motor is driven by the controller to drive the degree disc to rotate coaxially; the stabilized power supply is connected to the controller and the stepper motor driver; the controller and the camera are respectively connected to the working computer through the wiring serial port.

[0023] In the embodiment, the base provides stable support for the entire polarimeter, is rectangular in shape, and is provided with a positioning hole and a plurality of uniformly distributed supporting legs at the bottom, so as to facilitate the positioning of the camera and the movement and stability of the polarimeter. The camera replaces the traditional eyepiece and is used for shooting the field of view in the objective lens of the polarimeter. The camera does not need to have high resolution, 200w pixels and 1280*720 resolution can be used, and the response is 30 frames / second, and the automatic exposure function is not used, so as to ensure that the change of the three-field view can be accurately captured. The stabilized power supply adopts a voltage of 12V / 2A. The stepper motor adopts a two-phase stepper motor, the step angle is 1.8 degrees, the torque is 0.2-0.8 Newton·meter (N·m), and the stepper motor controller is 128-subdivided.

[0024] The utility model not only can measure the solution of invariable optical rotation, have the ability of static measurement of optical rotation, but also can measure the solution reaction, the optical rotation of solution changes, and carry out the automatic dynamic measurement of solution reaction kinetics.

[0025] The operation method of the automatic disc polarimeter of the embodiment comprises the following steps:

[0026] 1) When there is no optically active solution in the sample tube, the field of view video or image of the polarimeter is collected from the camera through the lens barrel and transmitted to the working computer;

[0027] 2) The working computer controls the motor driver to drive the stepper motor to drive the disc and the polarizer to rotate coaxially, the number of steps of the stepper motor is accurately corresponding to the rotation angle of the polarizer, the polarizer is rotated to make the full dark field observed from the transmitted image as the zero point of the disc, at this time, the field of view is called the zero position field of view;

[0028] 3) Put the sample tube containing the optically active substance into the lens barrel for measurement, the optical activity of the solution rotates the plane polarized light by an angle, the analyzation is realized by the analyzer, the video or image of the field of view at this time is collected by the camera, and is transmitted to the working computer;

[0029] 4) The working computer sees that the three-part field of view has different illuminances, i.e., the middle is bright and the left and right are dark, or the middle is dark and the left and right are bright;

[0030] 5) The working computer controls the motor driver to drive the stepper motor to drive the coaxial rotation of the degree disc and the analyzer, and the number of steps of the stepper motor is consistent with the rotation angle of the degree disc, so that the number of steps of the stepper motor is consistent with the rotation angle of the analyzer, the stepper motor drives the degree disc and the analyzer, and the camera image is adjusted to be a full dark field of view, the number of steps of the stepper motor is obtained, the rotation angle of the analyzer is obtained, i.e., the optical activity of the solution, so that automatic identification and accurate measurement are realized.

[0031] Finally, it should be noted that the purpose of publishing the embodiments is to help further understand the utility model, but those skilled in the art can understand that various substitutions and modifications are possible without departing from the spirit and scope of the utility model and the appended claims. Therefore, the utility model should not be limited to the disclosed content of the embodiments, and the scope of protection required by the utility model is the scope defined by the claims.

Claims

1. An automated polarimeter comprising: The base, light source, polarizer, half-wave plate, lens barrel, reading magnifying lens, analyzer, degree disc and vernier, eyepiece, focusing screw and degree disc rotating hand wheel; wherein, the light source and the lens barrel are arranged on the base respectively, and the light source is located at one end of the lens barrel; the polarizer, half-wave plate and sample tube are located in the lens barrel; the analyzer, degree disc and eyepiece are arranged at the other end of the lens barrel, the degree disc is coaxial with the lens barrel, and the vernier is arranged on the degree disc to read the degree disc; the degree disc rotating hand wheel is connected to the degree disc to drive the degree disc and the analyzer to rotate; the focusing screw is connected to the eyepiece to adjust the focal length of the eyepiece; the reading magnifying lens is arranged on the periphery of the eyepiece to read the degree disc; characterized in that the automatic disc polarimeter further comprises a base, a camera, a camera support, a stepping motor, a coaxial device, a stepping motor driver, a wiring serial port and a controller; wherein, the camera support and the base are respectively mounted on the base, the camera is mounted at the top end of the camera support, the height and the pitch angle of the camera are adjusted through the camera support, the camera is located at the end of the lens barrel where the eyepiece is arranged, and the camera is used to shoot the field of view change in the eyepiece; the stepping motor is coaxially mounted with the degree disc through the coaxial device, so that the number of steps of the stepping motor is consistent with the rotation angle of the degree disc, thereby accurately controlling the rotation angle of the degree disc; the stepping motor is connected to the stepping motor driver, the stepping motor driver is connected to the controller, the stepping motor is driven by the stepping motor driver to coaxially rotate the degree disc through the controller, and the controller and the camera are respectively connected to a working computer through the wiring serial port.

2. The automatic disc polariscope according to claim 1, wherein The base provides stable support for the entire polarimeter, is rectangular in shape, and is provided at the bottom with a positioning hole and a plurality of support legs uniformly distributed.

3. The automatic disc polariscope of claim 1 wherein, The camera support comprises an adjustable lifting support rod and a universal cloud platform, wherein the bottom of the adjustable lifting support rod is fixed to the upper surface of the base, the adjustable lifting support rod can adjust the height along the axial direction, the universal cloud platform is arranged at the top of the adjustable lifting support rod, the universal cloud platform can adjust the pitch angle, and the camera is mounted on the universal cloud platform, so that the height of the camera is adjusted through the adjustable lifting support rod, the pitch angle of the camera is adjusted through the universal cloud platform, and the shooting field of view of the camera is adjusted.

4. The automatic disc polariscope of claim 1 wherein, The motor support and the fixing screw are further included, the fixing screw is used to stably fix the stepping motor on the base of the polarimeter through the motor support.

5. The automatic disc polariscope of claim 1 wherein, The voltage stabilizing power supply is further included, and the voltage stabilizing power supply is connected to the controller and the stepping motor driver.

6. The automatic disc polariscope of claim 1 wherein, The torque of the stepping motor is 0.2-0.8 Newton·meter.

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