Double-end-face self-adaptive zooming optical quantifying device

Abstract

The invention belongs to the field of chemical quantitative analysis, and provides a double-end-face self-adaptive zooming optical quantitative device which comprises a straight pipe with a square outer portion and a round inner portion, and a self-adaptive zooming assembly comprises a first self-adaptive optical unit and a second self-adaptive optical unit which are arranged in the centers of the upper end face and the lower end face of the straight pipe respectively. The optical axes of the first self-adaptive optical unit and the second self-adaptive optical unit are parallel to the axis of the straight pipe and used for dynamically adjusting the optical focal length, the image acquisition assembly comprises a main sensor unit and an auxiliary sensor unit which are arranged on the end faces of the two ends of the straight pipe respectively, and the main sensor unit and the auxiliary sensor unit are installed in a diagonal symmetry mode and used for liquid level three-dimensional coordinate resolving; through cooperative work of double units of the self-adaptive zooming assembly, the optical focal length can be dynamically adjusted according to the liquid level change of a sample, the range change is realized, wide-range optical quantitative analysis is carried out, the detection requirements of samples with different concentrations and volumes are met, and the instrument does not need to be frequently replaced or adjusted.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of chemical quantitative analysis, and particularly relates to an optical quantitative device with double-end-face adaptive zoom. BACKGROUND

[0002] In the field of chemical quantitative analysis, optical quantitative devices are widely used due to their high precision and non-contact detection advantages.

[0003] However, the measurement range of traditional optical quantitative devices is usually fixed, and is only suitable for samples with specific concentrations or volumes. When facing micro-high-concentration or large-volume-low-concentration samples, it is often necessary to replace the instrument or key components, which not only is cumbersome to operate, but also may introduce human errors, increase detection costs and time consumption. Moreover, the optical system is easily disturbed by factors such as vibration and temperature fluctuation, resulting in phase drift or distortion of the light path, affecting the measurement precision, and being difficult to meet the demand of high-stability quantitative analysis. At the same time, most devices rely on a single sensor or simple image processing, and are difficult to capture the dynamic changes of the liquid level in real time, especially during the sample feeding or reaction process, and cannot accurately obtain key parameters such as liquid level height and rising rate, which limits the accuracy and efficiency of quantitative analysis. SUMMARY

[0004] In order to solve the above technical problems, the present application provides an optical quantitative device with double-end-face adaptive zoom to solve the problems of range limitation, easy disturbance and insufficient liquid level detection precision of the traditional optical quantitative device in the prior art.

[0005] An optical quantitative device with double-end-face adaptive zoom, comprising:

[0006] a straight tube, which is designed as an outer square and an inner circular transparent design, and is used for containing a sample;

[0007] an adaptive zoom assembly, comprising an adaptive optical unit one and an adaptive optical unit two which are respectively arranged at the centers of the upper and lower end faces of the straight tube, the optical axes of the adaptive optical unit one and the adaptive optical unit two being parallel to the axis of the straight tube, and the adaptive zoom assembly being used for dynamically adjusting the optical focal length;

[0008] an image acquisition assembly, comprising a main sensor unit and a secondary sensor unit which are respectively arranged at the two end faces of the straight tube, and are diagonally symmetrically installed, and the image acquisition assembly being used for liquid level three-dimensional coordinate solving;

[0009] a phase detection unit, which is arranged on the straight tube, and is used for real-time monitoring of end-face optical phase drift;

[0010] a main control board, which is loaded with a calculation processing unit and a feedback control unit, the calculation processing unit being used for solving the liquid level rising speed and position, and the feedback control unit being used for dynamically compensating environmental disturbance;

[0011] Liquid inlet and outlet assembly is installed on the upper and lower ends of the side of the straight tube for controlling sample inlet and outlet.

[0012] Preferably, the adaptive optical unit one is a liquid crystal spatial light modulator, which is mounted on the upper end face of the straight tube in an inverted manner, and the effective light aperture covers 100% of the cross section of the straight tube, for horizontal wavefront correction.

[0013] Preferably, the adaptive optical unit two is a micro-electromechanical deformable mirror, which adopts a convex mirror design for vertical focal length adjustment.

[0014] Preferably, the main sensor unit is a back-illuminated high-resolution CMOS camera, which is optically conjugated with the adaptive optical unit one; and the auxiliary sensor unit is an event camera.

[0015] Preferably, the phase detection unit adopts a ring-shaped fiber-optic Mach-Zehnder interferometer distributed on the edge of the upper end face of the straight tube, and the detection light path has an included angle with the axis of the straight tube.

[0016] Preferably, the calculation processing unit adopts an optical flow algorithm to calculate the liquid level rising speed and position in real time.

[0017] Preferably, the feedback control unit adopts a feedback control circuit designed with a FPGA+DSP architecture.

[0018] Preferably, the liquid inlet and outlet assembly includes three-way pipes one and two arranged in communication with the side of the straight tube, the three-way pipe one is provided with an emptying valve and a pumping interface at two ends respectively, and the three-way pipe two is provided with a liquid inlet valve and a liquid outlet valve at two ends respectively, for controlling sample inlet and outlet and ensuring the internal sealing of the device.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] 1. The double-unit cooperative work of the adaptive zoom assembly can dynamically adjust the optical focal length according to the sample liquid level change, realize the range change, carry out the wide-range optical quantitative analysis, meet the detection needs of different concentrations and volumes of samples, and there is no need to frequently replace or adjust the instrument.

[0021] 2. The phase detection unit monitors the optical phase drift in real time, the feedback control unit dynamically compensates the environmental disturbance, the high-resolution image acquisition assembly 5 and the accurate algorithm are combined, the measurement accuracy is effectively improved, and the influence of environmental factors on the measurement result is reduced.

[0022] 3. The auxiliary sensor unit quickly captures the liquid level mutation, triggers the high-frame-rate acquisition of the main sensor unit, the calculation processing unit calculates the data in real time, realizes the dynamic tracking of the liquid level and the three-dimensional coordinate calculation, and improves the efficiency and intelligent degree of quantitative analysis. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The first perspective view of the structure of the present application;

[0024] Figure 2 The second perspective view of the structure of the present application;

[0025] Figure 3 The third perspective view of the structure of the present application;

[0026] Figure 4 The schematic diagram of module connection of the present application;

[0027] Figure 5 The schematic diagram of workflow of the present application.

[0028] In the figure:

[0029] 1, straight pipe; 2, adaptive zoom assembly; 201, adaptive optical unit one; 202, adaptive optical unit two; 3, liquid inlet and outlet assembly; 301, three-way pipe one; 302, emptying valve; 303, three-way pipe two; 304, liquid inlet valve; 305, liquid outlet valve; 4, phase detection unit; 5, image acquisition assembly; 501, main sensor unit; 502, auxiliary sensor unit; 6, calculation processing unit; 7, feedback control unit. DETAILED DESCRIPTION

[0030] The embodiments of the present application will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0031] As shown in the accompanying Figure 1 to the accompanying Figure 5 :

[0032] The present application provides a kind of double-end face adaptive zoom optical quantitative device, including straight pipe 1, adaptive zoom assembly 2 and image acquisition assembly 5 are integrated on the upper and lower end surface of straight pipe 1, form double-end face collaborative measurement architecture.

[0033] As shown in the accompanying Figure 1 to the accompanying Figure 3 : straight pipe 1 adopts the transparent design of outer square inner circle, provides sample containing space for the whole device. Its upper and lower end surface is integrated with key assembly respectively, forms double-end face optical measurement system.

[0034] As shown in the accompanying Figure 1 to the accompanying Figure 3As shown in the figure: adaptive zoom assembly 2 includes adaptive optical unit one 201 and adaptive optical unit two 202 arranged at the center of the upper end face and the lower end face of the straight tube 1. Adaptive optical unit one 201 is a liquid crystal spatial light modulator, which is mounted in an inverted manner and seamlessly attached to the upper end face of the straight tube 1 through an optical adhesive layer, with an effective light aperture of 100% covering the cross section of the straight tube, and can realize horizontal wavefront correction by modulating the arrangement of liquid crystal molecules through a 0-5V voltage. Adaptive optical unit two 202 is a micro-electromechanical deformable mirror, which is designed as a convex mirror and mounted at the center of the lower end face through a precision mechanical clamp, with a dynamic adjustment range of curvature radius of-10mm to +10mm and a coaxiality deviation of <5μm with the straight tube axis, responsible for vertical focal length adjustment, and the two cooperate to realize zoom function.

[0035] As shown in the figure Figure 1 to the figure Figure 3 As shown in the figure: the inlet and outlet assembly 3 is connected to the upper and lower ends of the side of the straight tube 1, including three-way pipe one 301 and three-way pipe two 303. Three-way pipe one 301 is connected to the exhaust valve 302 and the extraction interface on both sides, and three-way pipe two 303 is connected to the inlet valve 304 and the outlet valve 305 on both sides, which is used to control the inlet and outlet of the sample and ensure the internal sealing of the device, with a leakage rate of <0.1μL / h.

[0036] As shown in the figure Figure 1 to the figure Figure 3 As shown in the figure: the phase detection unit 4 adopts a fiber-optic Mach-Zehnder interferometer distributed in a ring shape on the edge of the upper end face of the straight tube 1, with a detection light path angle of 30°-60° with the axis, which can monitor the end face optical phase drift in real time, with an accuracy of π / 200 rad, to ensure measurement accuracy.

[0037] As shown in the figure Figure 1 to the figure Figure 3 As shown in the figure: the image acquisition assembly 5 includes main sensor unit 501 and auxiliary sensor unit 502 arranged at the two ends of the straight tube 1, respectively, which are installed in a diagonal line symmetry and form a stereo vision baseline. The main sensor unit 501 is a back-illuminated high-resolution CMOS camera, which is optically conjugated with the liquid crystal spatial light modulator, with a pixel size of 2.4μm and a frame rate of 100fps; the auxiliary sensor unit 502 is an event camera, with a time resolution of ≤1μs, which can capture liquid level mutation events in real time and is used for liquid level three-dimensional coordinate solution.

[0038] As shown in the figure Figure 4 The main control board is equipped with a computing processing unit 6 and a feedback control unit 7. The computing processing unit 6 uses optical flow algorithm to solve the liquid level rising speed and position in real time; the feedback control unit 7 adopts a feedback control circuit design with FPGA+DSP heterogeneous architecture and is installed in the control box. The feedback control circuit is integrated with the following core modules:

[0039] FPGA processing unit:

[0040] Real-time signal preprocessing: The multi-path interference signals received by the phase detection unit 4 (ring array 3-6 detection points) are subjected to analog-to-digital conversion (ADC) and filtering and noise reduction, and the phase deviation characteristic quantity is extracted.

[0041] High-speed logic control: The preset program realizes fast comparison and logic judgment of phase error, generates preliminary control instructions, and the response speed reaches nanosecond level.

[0042] Parallel data processing: The image data of the double-end-face sensor 5 is processed simultaneously, and the space-time alignment is performed with the phase data to ensure the synchronization of the control instructions.

[0043] DSP calculation unit:

[0044] Complex algorithm execution: The Kalman filter algorithm is run to eliminate abnormal values such as bubble interference; the PID (proportional-integral-derivative) control algorithm is implemented to calculate the optimal phase correction parameters.

[0045] Model optimization: The built-in deep learning model is trained through historical data to dynamically optimize the phase compensation strategy and improve long-term stability.

[0046] Interface management: Communicate with the calculation processing unit 6 to receive parameters such as liquid level height and range, and cooperatively adjust the control strategy.

[0047] Drive output module:

[0048] Voltage / current drive: Generate 0-5V analog voltage signal to drive LC-SLM1, and output PWM (pulse width modulation) signal to control the curvature adjustment of MEMSDM2.

[0049] Power amplification: Amplify the control signal through an operational amplifier to ensure that the driving capability meets the dynamic response requirements of the optical module.

[0050] Auxiliary circuit:

[0051] Clock synchronization circuit: High-precision crystal oscillator provides synchronous clock for FPGA and DSP to ensure the timing consistency of phase detection and control output.

[0052] Power management circuit: DC-DC converter provides multiple stable power supplies (such as 3.3V, 5V, 12V) to suppress the interference of power supply ripple on the precision optical module.

[0053] Communication interface: Integrates USB, SPI, CAN and other interfaces to support host computer debugging and system parameter configuration.

[0054] As shown in the accompanying Figure 5 The overall working process of the variable range optical quantitative device is as follows:

[0055] S1, end face optical initialization: adaptive optical unit 201 loads a plane wave front, adaptive optical unit 202 is adjusted to a plane state, and the main sensor unit 501 and the auxiliary sensor unit 502 synchronously collect background images to establish a phase reference.

[0056] S2, dynamic tracking of the liquid level: the auxiliary sensor unit 502 detects a rising edge of the liquid level when the liquid is fed, triggers the main sensor unit 501 to collect at a high frame rate, and the calculation processing unit 6 calculates the liquid level speed and position through an optical flow algorithm.

[0057] S3, cooperative focusing of the double AO modules: the adaptive optical unit 202 is adjusted to a curvature radius R = H / 2 according to the liquid level height H, and the adaptive optical unit 201 generates a cylindrical wave front to compensate for the rough surface scattering.

[0058] S4, three-dimensional reconstruction and closed-loop correction: the three-dimensional coordinates are calculated through a stereo vision algorithm after the data fusion of the double sensors, the phase detection unit 4 feeds back to the feedback control unit 7 in real time, and the optical module parameters are dynamically adjusted.

[0059] Working principle:

[0060] In use, the sample is fed in and out through the liquid feeding and discharging assembly 3. The liquid feeding valve 304 is opened, the sample is injected into the straight pipe 1 through the three-way pipe two 303, after detection, the liquid discharging valve 305 is opened to discharge the sample, and if necessary, the device can be emptied and cleaned through the emptying valve 302 and the extraction interface.

[0061] Before detection, end face optical initialization is performed: the adaptive optical unit 201 loads a plane wave front, the adaptive optical unit 202 is adjusted to a plane state, and the main sensor unit 501 and the auxiliary sensor unit 502 synchronously collect background images to establish a phase reference.

[0062] During the liquid feeding process, the auxiliary sensor unit 502 detects the liquid level change in real time, and when the rising edge of the liquid level is detected, the main sensor unit 501 is triggered to collect at a high frame rate. The calculation processing unit 6 processes the collected image data through an optical flow algorithm, and calculates the liquid level rising speed and position in real time.

[0063] According to the calculated liquid level height H, the feedback control unit 7 controls the adaptive optical unit 202 to adjust the curvature radius to R = H / 2, and controls the adaptive optical unit 201 to generate a cylindrical wave front to compensate for the rough surface scattering, so as to realize the cooperative focusing of the double AO modules.

[0064] The data collected by the main sensor unit 501 and the auxiliary sensor unit 502 are fused, and the three-dimensional coordinates of the liquid level are calculated through a stereo vision algorithm. The phase detection unit 4 monitors the optical phase drift of the end face in real time, and feeds back the data to the feedback control unit 7. The feedback control unit 7 dynamically adjusts the optical module parameters to ensure the accuracy and stability of the measurement.

[0065] The embodiments of the present application are given for example and description, although the embodiments of the present application have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary, and cannot be understood as limiting the present application, and the changes, modifications, replacements and modifications of the above-mentioned embodiments made by the ordinary skilled in the art within the scope of the present application should be included in the protection scope of the present application.

Claims

1. An optical quantitative device with dual-end surface adaptive zoom, characterized in that: include: A straight tube (1) with a square outer surface and a round inner surface and transparent design is used to accommodate the sample; An adaptive zoom assembly (2) comprises an adaptive optical unit 1 (201) and an adaptive optical unit 2 (202) respectively arranged at the centers of the upper and lower end surfaces of the straight tube (1), wherein the optical axes of the adaptive optical unit 1 (201) and the adaptive optical unit 2 (202) are parallel to the axis of the straight tube (1) and are used for dynamically adjusting the optical focal length; An image acquisition component (5) comprises a main sensor unit (501) and a secondary sensor unit (502) respectively arranged on the end surfaces of both ends of the straight tube (1), the two being installed diagonally symmetrically and used for calculating the three-dimensional coordinates of the liquid level; A phase detection unit (4) is provided on the straight tube (1) and is used for real-time monitoring of end face optical phase drift; A main control board is equipped with a calculation processing unit (6) and a feedback control unit (7), wherein the calculation processing unit (6) is used to calculate the liquid level rising speed and position, and the feedback control unit (7) is used to dynamically compensate for environmental disturbances; The liquid inlet and outlet components (3) are installed at the upper and lower ends of the side of the straight tube (1) and are used to control the inlet and outlet of the sample.

2. The variable range optical quantitative device according to claim 1, characterized in that: The adaptive optical unit 1 (201) is a liquid crystal spatial light modulator, which is mounted in the center of the upper end face of the straight tube (1) in an inverted manner, and the effective light aperture covers 100% of the inner cross section of the straight tube (1) for horizontal wavefront correction.

3. The variable range optical quantitative device according to claim 1, characterized in that: The adaptive optical unit 2 (202) is a micro-electromechanical deformable mirror, which adopts a convex mirror design and is used for vertical focal length adjustment.

4. The variable range optical quantitative device according to claim 1, characterized in that: The main sensor unit (501) is a back-illuminated high-resolution CMOS camera, optically conjugated with the adaptive optical unit (201); the auxiliary sensor unit (502) is an event camera.

5. The variable range optical quantitative device according to claim 1, characterized in that: The phase detection unit (4) uses an optical fiber Mach-Zehnder interferometer distributed in an annular manner on the edge of the upper end surface of the straight tube (1), and the detection light path has an angle with the axis of the straight tube (1).

6. The variable range optical quantitative device according to claim 1, characterized in that: The calculation processing unit (6) uses an optical flow algorithm to calculate the liquid level rising speed and position in real time.

7. The variable range optical quantitative device according to claim 1, characterized in that: The feedback control unit (7) adopts a feedback control circuit design with an FPGA+DSP architecture.

8. The variable range optical quantitative device according to claim 1, characterized in that: The liquid inlet and outlet assembly (3) comprises a three-way pipe (301) and a three-way pipe (303) which are arranged on the side of the straight pipe (1) in communication with each other. The two ends of the three-way pipe (301) are respectively provided with an emptying valve (302) and an extraction interface. The two ends of the three-way pipe (303) are respectively provided with a liquid inlet valve (304) and a liquid outlet valve (305) for controlling the inlet and outlet of the sample and ensuring the internal sealing of the device.

Images