Flow measurement calibration device and method based on high-speed photography and pulsating thermal radiation micro-size impact technology

Abstract

The invention relates to a flow measurement device and method, in particular to a flow measurement calibration device and method based on a high-speed photography and pulsating thermal radiation micro-size impact technology. The device can measure, feed back and correct the measurement result in real time, the device is installed on the guide pipe according to the flow velocity direction before measurement, then parameters such as the flow velocity are measured, and real-time correction is carried out. When flow velocity measurement and calibration are carried out, the device can be suitable for various kinds of liquid, fluid and other media, compatibility is good, and adaptability is high. A common flowmeter, a circuit board, a high-speed lens and a pulse heat radiation generator are integrally packaged, the structure is small, and stability is high. The shape determination of the heat affected zone is detected, and pixel-level operation is performed on the image acquired by the high-speed camera, so that the nuance of the shape of the heat affected zone can be accurately measured in real time. And for an edge detection algorithm, the Canny operator is adopted, so that an area with relatively large temperature change in the image can be identified, a non-edge area can be inhibited, and the accuracy is high.

Description

Technical Field

[0001] The present invention relates to a flow measurement device and method, and to a flow measurement calibration device and method based on high-speed photography and pulsating thermal radiation micro-size impact technology. Background Art

[0002] At present, flow measurement is widely used in industrial production to monitor and control the flow of liquids and gases. For example, in chemical plants, pharmaceutical plants, food processing and other industries, by real-time monitoring of flow, the stability of the production process and product quality can be ensured; in urban water supply and drainage systems, flow measurement is used to measure and monitor the flow of water. This helps to ensure normal water supply and drainage, optimize the operation of the pipeline network, and improve the utilization efficiency of water resources; in the medical field, flow measurement is used to monitor and control drug delivery, gas flow of ventilators, etc. It is also commonly used in surgery and laboratory equipment; in scientific research, flow measurement is used for laboratory equipment, such as measuring the flow rate of liquids in chemical experiments, or measuring the flow rate of gases in biological experiments. In general, flow measurement has important applications in various fields such as industry, production, environmental monitoring, medical care and laboratories, and it provides key technical support to ensure accurate measurement and control of fluid flow.

[0003] The accuracy of current flow measurement systems is affected. The accuracy may be affected by changes in fluid properties, temperature and pressure, which may lead to inaccurate measurements; different types of flow meters are suitable for different flow characteristics and have poor applicability; noise and external interference may affect the sensor readings, resulting in inaccurate flow measurements, and the anti-interference ability is poor.

[0004] CN105222838B discloses a flow meter housing and a flow meter, wherein the housing of the invention increases the internal air flow channel, so that the flow meter using the housing has the functions of rectification and noise reduction, and reduces the installation area of ​​the flow meter. Only the basic structure is changed.

[0005] CN116519067A discloses a control circuit, control method, medium and program for a vortex flowmeter, which effectively improves the problem of low range ratio in the prior art that the vortex signal and the noise signal cannot be separated when the second-order low-pass filter processes the signal, thereby effectively improving the recognition range of the vortex signal. Only the control part of the flow system is innovated. Summary of the invention

[0006] In response to the technical problems raised above, a flow measurement calibration device and method based on high-speed photography and pulsating thermal radiation micro-size impact technology is provided.

[0007] The technical means adopted by the present invention are as follows:

[0008] A flow measurement calibration device and method based on high-speed photography and pulsating thermal radiation micro-size impact technology, characterized in that the device shell is equipped with a liquid crystal display and a circuit board, and the circuit board is equipped with a mounting bracket for fixing the device, and the mounting bracket can be directly fixed to the catheter, a high-speed lens is installed on the circuit board through a signal input and output interface, and the high-speed lens has a built-in high-precision image acquisition device, a pulse thermal radiation generator is installed on the circuit board through the signal input and output interface, and the pulse thermal radiation generator can emit high-frequency pulses, a processor and electrical components for image processing are installed on the circuit board, and the electrical components can process proprietary image processing algorithms, the circuit board is provided with a power input interface and a signal I / O interface, the high-speed camera takes real-time photos of the shape of the heat source, and by comparing the relationship between time and pixel points, the liquid flow rate can be measured with high measurement accuracy.

[0009] The common flow meter is connected to the conduit, and the flow meter is used to calibrate the flow rate parameters of the liquid in the conduit being measured in real time.

[0010] The high-speed camera is installed on the circuit board through high-speed lens signal input and output. The high-speed camera has a high-precision imaging device and a data acquisition device, which can capture the area changes of the heat-affected zone in real time with high precision through changes in different heat band ranges, and a high-frequency lens signal acquisition port is installed at the front end of the high-speed camera.

[0011] The rear end of the pulse heat radiation generator is equipped with a pulse heat radiation generator signal input end and an output end connected to the circuit board, and the front end of the pulse heat radiation generator is equipped with a pulse heat radiation high-frequency signal transmitting port.

[0012] The device shell has a simple structure, and a liquid crystal screen is installed outside the device shell. The shape of the heat-affected zone is photographed in real time by the high-speed camera, and the liquid flow velocity can be measured with high sensitivity.

[0013] The measurement and calibration method is as follows: if there is no liquid flowing in the conduit, a pulsating thermal radiation shock is given outside the conduit, and the heat-affected zone on the conduit surface presents a circular high-temperature spot. When fluid passes through the conduit, after the pulsating thermal radiation shock is given to the conduit, the heat-affected zone is elongated from a high-temperature circular spot along the liquid flow direction, forming an elliptical heat-affected zone on the conduit, and the elliptical heat-affected zone is in a proportional relationship with the liquid flow speed, and the shape of the elliptical heat-affected zone can be photographed by the high-speed camera and image processing is performed by pixel points, and the change law of the pixel points and time is processed by the processor, and the relationship between the temperature and flow data is calibrated by the flow meter, and the liquid flow parameters are displayed on the liquid crystal display screen.

[0014] The area shape of the heat affected zone changes continuously with time, and the temperature of the heat affected zone presents a gradient change. For the shape of the heat affected zone obtained, pixel-level operations are used to distinguish the color of the heat affected zone by channel and filter the data. Through the multiple data acquisition of the high-frequency camera, the subtle differences in the shape of the heat affected zone can be accurately measured in real time.

[0015] The area shape edge detection of the heat affected zone: The edge detection algorithm uses the Canny operator to identify the area with large temperature changes in the image, calculate the gradient of the heat affected zone, and obtain the gradient strength and direction of each pixel. In the gradient direction, only the pixels with the largest local gradient are retained, and the non-edge area is suppressed. The pixels in the gradient map are divided into strong edges, weak edges and non-edges using a threshold. Then, the weak edge is connected to the strong edge through edge connection to form a complete edge of the heat affected zone.

[0016] like Figure 1 to Figure 6As shown, a flow measurement calibration device based on high-speed photography and pulsating thermal radiation micro-size impact technology is mainly composed of a catheter, a calibration flow meter, a high-speed photography and pulsating thermal radiation measuring device. The mounting bracket includes a device housing, a circuit board is mounted on the device housing, and a mounting bracket No. I and a circuit board fixing port and a mounting bracket No. II and a circuit board fixing port are mounted on the circuit board, and the mounting bracket No. I and the circuit board fixing port and the mounting bracket No. II and the circuit board fixing port are connected to the mounting bracket, a processor is mounted on the circuit board, a high-speed lens signal input terminal and a high-speed lens signal output terminal are mounted on the circuit board, and the high-speed lens signal input terminal and the high-speed lens signal output terminal are connected to the high-speed lens, a pulse thermal radiation generator signal input terminal and a pulse thermal radiation generator signal output terminal are mounted on the circuit board, and the pulse thermal radiation generator signal input terminal and the pulse thermal radiation generator signal output terminal are connected to the pulse thermal radiation generator, a power supply interface and a total signal I / O interface are mounted on the circuit board, a pulse thermal radiation high-frequency signal transmitting port is mounted at the end of the pulse thermal radiation generator, and a high-speed lens signal acquisition port is mounted at the end of the high-speed lens.

[0017] The high-speed camera is equipped with a small high-precision lens component and an image acquisition execution terminal.

[0018] The pulse thermal radiation generator is equipped with a pulse thermal radiation generator energy processing device and a pulse thermal radiation generator energy generating device.

[0019] In use: before processing, install a flow measurement calibration device based on high-speed photography and pulsating thermal radiation micro-size impact technology on the catheter in the correct installation direction, and transmit pulse energy to the catheter through the pulse thermal radiation generator. The high-speed camera collects the image data of the heat-affected zone. After that, the processor can process the pixels of the image, count the regional changes and time relationship of the heat-affected zone, and calibrate the flow parameters through the data collected by the ordinary flow meter. The processing process of the processor is as follows: original image → Gaussian filtering → smoothed image → gradient and direction of each pixel → temperature gradient map → retain the pixel with the largest local gradient → image after non-maximum suppression → double threshold method → ​​pixels in the gradient map are divided into strong edges, weak edges and non-edges → image processing is completed → edge changes over time → flow meter calibration → LCD screen displays flow parameters. Achieve measurement - calibration - feedback - real-time monitoring, real-time display of flow parameters.

[0020] The method for using the flow measurement calibration device based on high-speed photography and pulsating thermal radiation micro-size impact technology is as follows:

[0021] S1. Wipe the measured catheter position clean until there is no obvious contaminant on the surface of the clean white cloth.

[0022] S2, open the rear end cover of the mounting bracket and install the mounting bracket on the conduit for measuring flow rate.

[0023] S3, connect the power cord to the power interface and turn on the power.

[0024] S4, connecting the input signal through the main signal I / O interface at the control end, and performing data access control at the control end.

[0025] S5, controlling the pulse thermal radiation generator through the control end by sending the signal through the pulse thermal radiation generator signal input end, and feeding back the execution status to the processor through the pulse thermal radiation generator output end.

[0026] S6, the high-speed lens communicates with the processor through the high-speed lens signal input terminal and the high-speed lens signal output terminal, and transmits the heat-affected zone image signal captured by the high-speed lens to the processor.

[0027] S7, through the relationship between the captured image information and the time calibration, the processor processes the image result to obtain appropriate flow parameters.

[0028] In order to accurately measure the flow parameters in the catheter, the pixel method is used to process the high-speed photography results. The specific principles are as follows:

[0029]

[0030] This method takes the position in the image at time t0 as the initial position l0, and the position in the image at time t1 as the final position l1. The scale S between the unit length and the pixel point on the image is obtained by "Calibrate" from the calibration image of the benchmark between l0 and l1 p , m / pix. Then calculate the number of pixels n between l0 and l1.

[0031] The pixel coordinates are represented by I. Although both the pixel and image coordinate systems are located on the imaging plane, the starting points and measurement units of the two coordinate systems are different, and the origin is usually located in the upper left corner of the image. It is necessary to establish a coordinate system conversion model to convert it to the image coordinate system. x , I y The image coordinate system is established for the coordinate axis. The direction of the pixel coordinate system is the same as the direction of the image coordinate axis. The conversion relationship between the two coordinate systems is as follows:

[0032]

[0033] Solve the scale of displacement in the pixel coordinate system and the actual distance. When a moving target is detected moving in the pixel coordinate system, the pixel is (m,n), then the actual distance ΔO moved in the world coordinate system can be expressed as:

[0034]

[0035] Among them, O z is the distance from the lens to the heat affected zone, k x and k y Process parameters for camera calibration.

[0036] S8, obtaining the relationship between the corresponding fluid parameters and the image change by processing the pixel points by the processor.

[0037] S9, through the calibration of ordinary flow meter, the fluid parameters are displayed in real time on the LCD screen outside the shell.

[0038] Beneficial effects of the present invention:

[0039] 1. The present invention can measure, feedback and correct the measurement results in real time. Before measuring, the device is installed on the catheter according to the flow direction, and then the flow rate and other parameters are measured and corrected in real time.

[0040] 2. When calibrating flow rate measurement, it can be applied to a variety of liquids, fluids and other media, with good compatibility and adaptability.

[0041] 3. The ordinary flow meter, circuit board, high-speed lens and pulse thermal radiation generator are integrated into a package design with a compact structure and high stability.

[0042] 4. Detect the shape of the heat-affected zone and perform pixel-level operations on the image acquired by the high-speed camera, so as to accurately measure the subtle differences in the shape of the heat-affected zone in real time.

[0043] 5. For edge detection algorithms, the Canny operator can be used to identify areas with large temperature changes in the image and suppress non-edge areas with high accuracy.

[0044] 6. The designed device can accurately measure the flow parameters by comparing the time, pixel points, and data fed back by the flow meter, calibrating and feeding back the corresponding flow data. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is an isometric view of a flow measurement calibration device and method based on high-speed photography and pulsating thermal radiation micro-size impact technology in a specific embodiment of the present invention.

[0046] Figure 2 It is a structural schematic diagram of a flow measurement calibration device and method based on high-speed photography and pulsating thermal radiation micro-size impact technology in a specific implementation manner of the present invention.

[0047] Figure 3 It is a schematic diagram of the structure of a high-speed camera in a specific implementation manner of the present invention.

[0048] Figure 4 It is a schematic diagram of a pulse thermal radiation generator in a specific implementation manner of the present invention.

[0049] Figure 5 It is a schematic diagram of the detection principle of the method in a specific implementation manner of the present invention.

[0050] Figure 6 It is a method algorithm processing flow chart in a specific implementation mode of the present invention.

[0051] Among them, 1-catheter, 2-device housing, 3-mounting bracket, 4-No. I mounting bracket and circuit board fixing port, 5-No. II mounting bracket and circuit board fixing port, 6-circuit board, 7-processor, 8-high-speed lens signal input terminal, 9-high-speed lens signal output terminal, 10-high-speed lens, 11-pulse thermal radiation generator, 12-pulse thermal radiation generator input terminal, 13-pulse thermal radiation generator output terminal, 14-power supply interface, 15-total signal I / O interface, 16-pulse thermal radiation high-frequency signal transmission port, 17-high-speed lens signal collection port, 18-heat affected zone, 1001 small high-precision lens assembly, 1002 image acquisition execution terminal, 1101 pulse thermal radiation generator energy processing device, 1102 pulse thermal radiation generator energy generating device. DETAILED DESCRIPTION

[0052] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions, which specifically include S1-S9.

[0053] S1. Wipe the measured catheter position clean until there is no obvious contaminant on the surface of the clean white cloth.

[0054] S2, open the rear end cover of the mounting bracket 3, and install the mounting bracket 3 on the conduit for measuring the flow velocity.

[0055] S3, connect the power line to the power interface 14 to turn on the power.

[0056] S4, the input signal is connected at the control end through the general signal I / O interface 15, and data access control is performed at the control end.

[0057] S5, the control end controls the pulse thermal radiation generator 11 through the pulse thermal radiation generator signal input end 12, and feeds back the execution status to the processor 7 through the pulse thermal radiation generator output end 13.

[0058] S6, the high-speed lens 10 communicates with the processor 7 through the high-speed lens signal input terminal 8 and the high-speed lens signal output terminal 9, and transmits the heat-affected zone image signal taken by the high-speed lens 10 to the processor 7.

[0059] S7, processor 7 processes the image result based on the relationship between the captured image information and the time calibration to obtain appropriate flow parameters.

[0060] In order to accurately measure the flow parameters in the catheter, the pixel method is used to process the high-speed photography results. The specific principles are as follows:

[0061]

[0062] This method takes the position in the image at time t0 as the initial position l0, and the position in the image at time t1 as the final position l1. The scale S between the unit length and the pixel point on the image is obtained by "Calibrate" from the calibration image of the benchmark between l0 and l1 p , m / pix. Then calculate the number of pixels n between l0 and l1.

[0063] Use P x ,P y Represents the pixel coordinates. Although both the pixel and image coordinate systems are located on the imaging plane, the starting points and measurement units of the two coordinate systems are different, and the origin is usually located in the upper left corner of the image. It is necessary to establish a coordinate system conversion model to convert it to the image coordinate system. x , I y The image coordinate system is established for the coordinate axis. The direction of the pixel coordinate system is the same as the direction of the image coordinate axis. The conversion relationship between the two coordinate systems is as follows:

[0064]

[0065] Solve the scale of displacement in the pixel coordinate system and the actual distance. When a moving target is detected moving in the pixel coordinate system, the pixel is (m,n), then the actual distance ΔO moved in the world coordinate system can be expressed as:

[0066]

[0067] Among them, O z k is the distance from the lens to the heat affected zone 18, x and k y Process parameters for camera calibration.

[0068] S8, the processor 7 processes the pixels to obtain the relationship between the corresponding fluid parameters and the image changes.

[0069] S9, through the calibration of ordinary flow meter, the fluid parameters are displayed in real time on the LCD screen outside the shell.

Claims

1. A flow measurement calibration device based on high-speed photography and pulsating thermal radiation micro-size impact technology, characterized in that: It includes a device shell, a liquid crystal display and a circuit board are installed on the device shell, and a mounting bracket for fixing the device is installed on the circuit board, and the mounting bracket can be directly fixed to the catheter, a high-speed lens is installed on the circuit board through a signal input and output interface, and the high-speed lens has a built-in high-precision image acquisition device, a pulse thermal radiation generator is installed on the circuit board through the signal input and output interface, and the pulse thermal radiation generator can emit high-frequency pulses, a processor and electrical components for image processing are installed on the circuit board, and the electrical components can process a proprietary image processing algorithm, the circuit board is provided with a power input interface and a signal I / O interface, the high-speed camera takes real-time photos of the shape of the heat source, and by comparing the relationship between time and pixel points, the liquid flow rate can be measured with high measurement accuracy; The common flow meter is connected to the conduit, and the flow meter is used to calibrate the flow rate parameters of the liquid in the conduit being measured in real time; The high-speed camera is installed on the circuit board through high-speed lens signal input and output. The high-speed camera has a high-precision imaging device and a data acquisition device, which can capture the area change of the heat-affected zone in real time with high precision through the changes in different heat band ranges, and a high-frequency lens signal acquisition port is installed at the front end of the high-speed camera; The rear end of the pulse heat radiation generator is equipped with a pulse heat radiation generator signal input end and an output end connected to the circuit board, and the front end of the pulse heat radiation generator is equipped with a pulse heat radiation high-frequency signal transmitting port; The device shell has a simple structure, and a liquid crystal screen is installed outside the device shell, and the shape of the heat-affected zone is photographed in real time by the high-speed camera.

2. The flow measurement calibration device based on high-speed photography and pulsating thermal radiation micro-size impact technology as claimed in claim 1, characterized in that: The high-speed camera is equipped with a small high-precision lens component and an image acquisition execution terminal.

3. The flow measurement calibration device based on high-speed photography and pulsating thermal radiation micro-size impact technology according to claim 1 or 2, characterized in that: The pulse thermal radiation generator is equipped with a pulse thermal radiation generator energy processing device and a pulse thermal radiation generator energy generating device.

4. The flow measurement calibration device based on high-speed photography and pulsating thermal radiation micro-size impact technology as claimed in claim 1 or 2, characterized in that: After the high-speed camera (10) collects image data of the heat-affected zone (18), the processor (7) can perform pixel processing on the image, count the regional changes and time relationships of the heat-affected zone, and calibrate the flow parameters using data collected by an ordinary flow meter.

5. The flow measurement calibration device based on high-speed photography and pulsating thermal radiation micro-size impact technology as claimed in claim 3, characterized in that: After the high-speed camera (10) collects image data of the heat-affected zone (18), the processor (7) can perform pixel processing on the image, count the regional changes and time relationships of the heat-affected zone, and calibrate the flow parameters using data collected by an ordinary flow meter.

6. The flow measurement calibration device based on high-speed photography and pulsating thermal radiation micro-size impact technology as described in claim 1, 2 or 5, characterized in that: The processing process of the processor (7) is as follows: original image → Gaussian filtering → smoothed image → gradient and direction of each pixel → temperature gradient map → retaining pixels with the largest local gradient → image after non-maximum suppression → double threshold method → ​​pixels in the gradient map are divided into strong edges, weak edges and non-edges → image processing completed → edge changes over time → flow meter calibration → LCD screen displays flow parameters; to achieve measurement - calibration - feedback - real-time monitoring, and real-time display of flow parameters.

7. The flow measurement calibration device based on high-speed photography and pulsating thermal radiation micro-size impact technology as claimed in claim 3, characterized in that: The processing process of the processor (7) is as follows: original image → Gaussian filtering → smoothed image → gradient and direction of each pixel → temperature gradient map → retaining pixels with the largest local gradient → image after non-maximum suppression → double threshold method → ​​pixels in the gradient map are divided into strong edges, weak edges and non-edges → image processing completed → edge changes over time → flow meter calibration → LCD screen displays flow parameters; to achieve measurement - calibration - feedback - real-time monitoring, and real-time display of flow parameters.

8. The flow measurement calibration device based on high-speed photography and pulsating thermal radiation micro-size impact technology as claimed in claim 4, characterized in that: The processing process of the processor (7) is as follows: original image → Gaussian filtering → smoothed image → gradient and direction of each pixel → temperature gradient map → retaining pixels with the largest local gradient → image after non-maximum suppression → double threshold method → ​​pixels in the gradient map are divided into strong edges, weak edges and non-edges → image processing completed → edge changes over time → flow meter calibration → LCD screen displays flow parameters; to achieve measurement - calibration - feedback - real-time monitoring, and real-time display of flow parameters.

9. A method for using a flow measurement calibration device based on high-speed photography and pulsating thermal radiation micro-size impact technology, characterized in that: Here are the steps: S1, wipe the measured catheter position clean until there is no obvious contaminant on the surface of the clean white cloth; S2, opening the rear end cover of the mounting bracket (3), and mounting the mounting bracket (3) on the conduit for measuring the flow velocity; S3, connecting the power cord to the power interface (14) to turn on the power; S4, connecting the input signal through the general signal I / O interface (15) at the control end, and performing data access control at the control end; S5, controlling the pulse heat radiation generator (11) through the control end by sending a signal through the pulse heat radiation generator signal input end (12), and feeding back the execution status to the processor (7) through the pulse heat radiation generator output end (13); S6, the high-speed lens (10) communicates with the processor (7) through the high-speed lens signal input terminal (8) and the high-speed lens signal output terminal (9), and transmits the heat-affected zone image signal captured by the high-speed lens (10) to the processor (7); S7, the processor (7) processes the image result based on the relationship between the captured image information and the time calibration to obtain appropriate flow parameters; The pixel method is used to process the high-speed photography results: This method takes the position in the image at time t0 as the initial position l0, and the position in the image at time t1 as the final position l1; the scale S between the unit length and the pixel point on the image is obtained by "Calibrate" from the calibration image of the benchmark between l0 and l1 p , m / pix; then calculate the number of pixels n between l0 and l1; Use (P x ,P y ) represents the pixel coordinates. Although both the pixel and image coordinate systems are located on the imaging plane, the starting points and measurement units of the two coordinate systems are different, and the origin is usually located in the upper left corner of the image. It is necessary to establish a coordinate system conversion model to convert it to the image coordinate system. x , I y The image coordinate system is established for the coordinate axis. The direction of the pixel coordinate system is the same as the direction of the image coordinate axis. The conversion relationship between the two coordinate systems is as follows: Solve the scale of displacement and actual distance in the pixel coordinate system; when a moving target is detected moving in the pixel coordinate system, the pixel is (m,n), then the actual moving distance ΔO in the world coordinate system can be expressed as: Among them, O z k is the distance from the lens to the heat affected zone (18), x and k y Process parameters for camera calibration; S8, obtaining the relationship between the corresponding fluid parameter and the image change by processing the pixel points by the processor (7); S9, through the calibration of ordinary flow meter, the fluid parameters are displayed in real time on the LCD screen outside the shell.

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