CN105334261A - Liquid oxygen content detection system and method - Google Patents
Liquid oxygen content detection system and method Download PDFInfo
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- CN105334261A CN105334261A CN201410330776.XA CN201410330776A CN105334261A CN 105334261 A CN105334261 A CN 105334261A CN 201410330776 A CN201410330776 A CN 201410330776A CN 105334261 A CN105334261 A CN 105334261A
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- 238000001514 detection method Methods 0.000 title claims abstract description 120
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 106
- 238000012545 processing Methods 0.000 claims abstract description 100
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 93
- 239000001301 oxygen Substances 0.000 claims abstract description 93
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 93
- 239000007789 gas Substances 0.000 claims abstract description 31
- 238000002604 ultrasonography Methods 0.000 claims abstract description 20
- 238000004090 dissolution Methods 0.000 claims description 42
- 230000003287 optical effect Effects 0.000 claims description 29
- 239000000523 sample Substances 0.000 claims description 28
- 238000003384 imaging method Methods 0.000 claims description 19
- 230000001678 irradiating effect Effects 0.000 claims description 9
- 230000004913 activation Effects 0.000 claims 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 84
- 239000000126 substance Substances 0.000 abstract description 4
- 229940079593 drug Drugs 0.000 abstract description 3
- 239000003814 drug Substances 0.000 abstract description 3
- 238000009210 therapy by ultrasound Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000002560 therapeutic procedure Methods 0.000 description 5
- 238000007872 degassing Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000015 thermotherapy Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003708 edge detection Methods 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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Abstract
The present invention provides a liquid oxygen content detection system and method. The system includes an image detection device, an image processing device and a high intensity ultrasonic generator. The high intensity ultrasonic generator is used for generating high intensity ultrasound; and the high intensity ultrasound generated by the high intensity ultrasonic generator irradiates the liquid to be measured, so that oxygen dissolved in the liquid to be measured absorbs ultrasonic energy, expands, and forms bubbles. The image detection device is used for collecting the image signal of the bubbles formed by the gas in the liquid to be measured. The image processing device is used for calculating the bubble content per unit area according to the image signal collected by the image detection device, so as to determine the oxygen content of the liquid to be measured. The scheme can make the oxygen dissolved in the water form bubbles, and make the bubble detection easier, so as to improve the detection precision. The scheme does not need additional chemical drugs or electrification for water, and has the advantages of fast, safe and convenient detection, and low detection cost.
Description
Technical Field
The invention relates to the technical field of ultrasonic detection, in particular to a liquid oxygen content detection system and method realized by utilizing an ultrasonic technology.
Background
High intensity focused ultrasound treatment requires medium water to transmit ultrasound, and uses a transducer to emit ultrasound into the focal zone of the body to perform the treatment. In order to achieve safe and effective treatment, the requirement on medium water is high, the oxygen dissolution amount of the medium water is generally required to be less than a certain value, otherwise, when high-intensity focused ultrasound treatment is carried out, the energy attenuation is high, the ultrasonic energy entering focuses is greatly reduced, the treatment effect is influenced, the treatment time is prolonged, and the treatment risk is increased. Therefore, in the high intensity focused ultrasound treatment, it is necessary to perform degassing (deoxidation) treatment on water by using a water treatment device, and then use the degassed water as an ultrasound conduction medium, i.e., medium water, in the high intensity focused ultrasound treatment.
One solution for detecting the oxygen content of the medium water is that an inspector periodically detects the medium water by using a third-party detection tool, such as an oxygen dissolving instrument. However, the dissolved oxygen meter generally measures the dissolved oxygen in water by an electrochemical method, the detection speed is slow, the detection precision is easily influenced by manual operation, and the price of the dissolved oxygen meter is not cheap.
At present, there is also a scheme for detecting the oxygen content in the medium water by using ultrasonic bubbles, which detects the bubbles in the medium water by using ultrasonic waves, detects echo signals generated by the bubbles, and processes and calculates the echo signals to obtain the oxygen content in the medium water. However, the detection method of the oxygen content in the medium water can only detect the bubbles in the medium water, but the detection accuracy is poor because the oxygen dissolved in the water cannot be detected.
Therefore, a solution for detecting the oxygen content of liquid is needed to solve the above technical problems.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a liquid oxygen content detection system and method, which are used for solving the problems of poor detection precision, slow detection speed and high detection cost of the oxygen content of the medium water.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a liquid oxygen content detection system, comprising: an image detection device, an image processing device and a high-intensity ultrasonic wave generation device;
the high-intensity ultrasonic wave generating device is used for generating high-intensity ultrasonic waves, and the high-intensity ultrasonic waves generated by the high-intensity ultrasonic wave generating device are utilized to irradiate the liquid to be detected so as to enable the gas in the liquid to be detected to form bubbles;
the image detection device is used for acquiring an image signal of bubbles formed by gas in the liquid to be detected;
the image processing device is connected with the image detection device and used for calculating the bubble content in unit area according to the image signals collected by the image detection device.
Preferably, the high-intensity ultrasonic wave generating device includes: an ultrasonic energy controller and a transducer;
the ultrasonic energy controller is respectively connected with the transducer and the image processing device and used for generating high-frequency current and sending the high-frequency current to the transducer;
the energy converter is arranged in a container for storing the liquid to be detected, is arranged below the liquid level of the liquid to be detected, and is used for converting high-frequency current sent by the ultrasonic energy controller into high-intensity ultrasonic waves and irradiating the liquid to be detected by utilizing the high-intensity ultrasonic waves.
Preferably, the image processing device is further connected to the high-intensity ultrasonic wave generating device, and a first timer and a first timing duration are preset in the image processing device;
the image processing device is used for sending a first starting signal to the high-intensity ultrasonic wave generating device, and when the first starting signal is sent to the high-intensity ultrasonic wave generating device, a first timer starts to time; when the first timing duration is up, sending a first stop signal to the high-intensity ultrasonic wave generating device;
the high-intensity ultrasonic wave generating device is specifically used for generating high-intensity ultrasonic waves when receiving a first starting signal sent by the image processing device; and stopping generating the high-intensity ultrasonic wave when receiving a first stop signal transmitted by the image processing device.
Preferably, the image detection apparatus includes: the ultrasonic probe is arranged below the liquid level of the liquid to be detected;
the ultrasonic probe is respectively connected with the ultrasonic imaging equipment and the image processing device and used for generating detection ultrasonic waves according to the control of the image processing device and irradiating the liquid to be detected by using the detection ultrasonic waves; receiving an echo signal and sending the echo signal to ultrasonic imaging equipment, wherein the echo signal is generated when the detection ultrasonic wave meets bubbles in liquid to be detected; and stopping generation of the probe ultrasonic wave according to control of the image processing apparatus;
the ultrasonic imaging equipment is connected with the image processing device and used for converting the received echo signals into ultrasonic image signals and sending the ultrasonic image signals to the image processing device;
the image processing device is specifically configured to calculate the bubble content per unit area according to an ultrasonic imaging signal sent by an ultrasonic imaging device.
Further, a second timer, a third timer, a second timing duration and a third timing duration are preset in the image processing apparatus, wherein the first timing duration is longer than the third timing duration and longer than the second timing duration;
the image processing device is also used for starting timing by a second timer when the first timing duration is reached; when the second timing duration is reached, the third timer starts timing and sends a second starting signal to the ultrasonic probe so as to control the ultrasonic probe to generate detection ultrasonic waves; and when the third timing time reaches, sending a second stop signal to the ultrasonic probe to control the ultrasonic probe to stop generating the detection ultrasonic wave.
Preferably, the first timing duration is 2-5S, and the second timing duration is 0.1-0.5S.
Preferably, the image detection device is an optical image acquisition device;
the optical image acquisition device is arranged below the liquid level of the liquid to be detected, and is specifically used for acquiring optical image signals of bubbles formed by gas in the liquid to be detected in a direction parallel to the horizontal plane of the liquid to be detected when the high-intensity ultrasonic wave generation device irradiates the liquid to be detected with the generated high-intensity ultrasonic waves;
the image processing device is specifically used for calculating the bubble content in unit area according to the optical image signal acquired by the optical image acquisition device.
Further, the image processing device is further configured to send a third start signal to the optical image acquisition device when sending the first start signal to the high-intensity ultrasonic wave generation device; when the first timing duration is up, sending a third stop signal to the optical image acquisition device;
the optical image acquisition device is specifically used for acquiring an optical image signal of bubbles formed by gas in the liquid to be detected in a direction parallel to the horizontal plane of the liquid to be detected when receiving a third starting signal sent by the image processing device; and when a third stop signal sent by the image processing device is received, stopping collecting the optical image signal of the bubbles formed by the gas in the liquid to be measured.
Furthermore, the image processing device is also internally preset with the corresponding relation between the content of bubbles in unit area and the oxygen dissolving amount;
and the image processing device is also used for inquiring the corresponding relation between the bubble content and the oxygen dissolution amount of the unit area according to the calculated bubble content of the unit area to obtain the oxygen dissolution amount corresponding to the bubble content of the unit area.
Further, a first threshold value is preset in the image processing device; the image processing device is also used for comparing the calculated bubble content per unit area with the first threshold value, and alarming when the bubble content per unit area is greater than the first threshold value; or,
a second threshold value is also preset in the image processing device; and the image processing device is also used for comparing the obtained oxygen dissolution amount corresponding to the bubble content of the unit area with the second threshold value, and alarming when the oxygen dissolution amount corresponding to the bubble content of the unit area is larger than the second threshold value.
The invention also provides a liquid oxygen content detection method, which comprises the following steps: transmitting high-intensity ultrasonic waves to liquid to be detected so as to enable gas in the liquid to be detected to form bubbles;
and selecting a region with bubbles in the liquid to be detected as a region to be detected, and calculating the bubble content of the region to be detected in unit area.
Preferably, the selecting a region with bubbles in the liquid to be measured as a region to be measured, and calculating the bubble content per unit area in the region to be measured specifically includes:
collecting an image of bubbles formed by gas in the liquid to be detected, selecting an area with the most concentrated bubbles on the collected image as an area to be detected, and calculating the total number of pixels in the area to be detected;
identifying bubbles in the region to be detected, and calculating the sum of the number of pixels occupied by the bubbles in the region to be detected;
and calculating the ratio of the total number of pixels in the region to be detected to the total number of pixels occupied by the bubbles in the region to be detected to obtain the bubble content in unit area.
The invention can utilize the high-intensity ultrasonic wave generating device to generate high-intensity ultrasonic waves, and irradiate the high-intensity ultrasonic waves on the liquid to be detected, so that oxygen dissolved in the liquid to be detected expands after absorbing the ultrasonic intensity amount and forms bubbles, an image detection device can be used for acquiring image signals of the bubbles, and an image processing device can be used for calculating the bubble content in unit area according to the image signals of the bubbles, thereby determining the oxygen content of the liquid to be detected; the scheme does not need to additionally apply chemical drugs, does not need to electrify water, and is high in detection speed, safe, convenient and low in detection cost.
Drawings
FIG. 1 is a schematic structural diagram of a liquid oxygen content detection system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a liquid oxygen content detection system according to embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of a liquid oxygen content detection system according to embodiment 2 of the present invention.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The liquid is applied with ultrasonic energy with higher intensity, and the gas dissolved in the liquid has strong blocking reflection effect on the ultrasonic, wherein part of the gas dissolved in the liquid can absorb the ultrasonic energy to expand to form bubbles, and the existing bubbles in the liquid can expand to be large enough, even the bubbles can be seen by naked eyes, and at the moment, the content of the bubbles in the liquid irradiated by the high-intensity ultrasonic is detected to detect the oxygen content of the liquid to be detected. For example, a liquid irradiated by high intensity ultrasound may be detected by the image detection device, if a certain amount of bubbles can be detected on the generated image, it indicates that the liquid contains a certain amount of gas, and the more bubbles, the higher the gas content of the liquid.
The invention provides a method for detecting the oxygen content of liquid, which comprises the following steps:
transmitting high-intensity ultrasonic waves to liquid to be detected so as to enable gas in the liquid to be detected to form bubbles;
selecting an area with bubbles in the liquid to be detected as an area to be detected, and calculating the content of the bubbles in unit area in the area to be detected.
The invention also provides a liquid oxygen content detection system, in particular to a system for detecting the oxygen content of the medium water for the high-intensity focused ultrasound treatment so as to determine whether the medium water meets the requirement of the oxygen content of the high-intensity focused ultrasound treatment. Fig. 1 is a schematic view of a liquid oxygen content detection system according to an embodiment of the present invention, the liquid oxygen content detection system may include: the device comprises an image detection device 1, an image processing device 2 and a high-intensity ultrasonic wave generation device 3, wherein the high-intensity ultrasonic wave generation device 3 is used for generating high-intensity ultrasonic waves, and the high-intensity ultrasonic waves generated by the high-intensity ultrasonic wave generation device are used for irradiating liquid to be measured so as to enable gas in the liquid to be measured to form bubbles, and the liquid to be measured can be water. The image detection device 1 is used for collecting an image signal of bubbles formed by gas in liquid to be detected. The image processing device 2 is connected with the image detection device 1 and is used for calculating the bubble content in unit area according to the image signal collected by the image detection device 1.
Preferably, the image processing device 2 may calculate the bubble content per unit area by using an image processing algorithm (for example, using an edge detection algorithm or a binarization algorithm, etc.), that is, a region in which bubbles are most concentrated is set as a region to be measured on an image acquired by the image detection device 1, the region to be measured is extracted, the total number of pixels in the region to be measured is calculated and is recorded as sumAll, then the bubbles in the region to be measured are identified, the total number of pixels occupied by the bubbles is calculated and is recorded as sumP, and the content percentage of the bubbles pRate is sumAll/100%.
The image processing device preferably comprises a display unit and an input unit, the display unit is connected with the image detection device 1 and used for displaying image signals acquired by the image detection device 1, a user selects a part of area from the image displayed by the display unit through the input unit to serve as an area to be detected, and the image processing device 2 calculates the bubble content of the unit area in the area to be detected. Preferably, the display unit may be a display screen, and the input unit may be a mouse, a keyboard, or the like.
Of course, if the position of the region to be detected can be determined, the image detection apparatus 1 may also be configured to collect only the image of the region to be detected (for example, the position of the image detection apparatus may be set), so that the image processing unit can directly calculate the bubble content per unit area in the region to be detected according to the image signal collected by the image detection apparatus.
In the embodiment of the present invention, the high intensity ultrasonic wave refers to sound intensity>10W/cm2The ultrasonic waves of (4).
The method comprises the steps of generating high-intensity ultrasonic waves by using a high-intensity ultrasonic wave generating device, irradiating the liquid to be detected with the high-intensity ultrasonic waves to enable oxygen dissolved in the liquid to be detected to absorb ultrasonic energy of the high-intensity ultrasonic waves and expand to form bubbles, acquiring image signals of the bubbles by using an image detection device, and calculating the content of the bubbles in a unit area by using an image processing device according to the image signals of the bubbles, so that the oxygen content of the liquid to be detected is determined; the scheme does not need to additionally apply chemical medicines to the liquid to be detected, does not need to electrify the liquid to be detected, and is high in detection speed, safe, convenient and low in detection cost.
Preferably, the high-intensity ultrasonic wave generating device 3 may include: an ultrasonic energy controller 31 and a transducer 32.
The ultrasonic energy controller 31 is connected to the transducer 32 and the image processing apparatus 2, respectively, and is configured to generate high-frequency currents and transmit the generated high-frequency currents to the transducer 32, so that the transducer 32 converts different high-frequency currents into high-frequency ultrasonic waves of different acoustic energies.
The transducer 32 may be disposed in a container for storing the liquid to be measured, and disposed below the liquid level of the liquid to be measured, and is configured to convert the high-frequency current sent by the ultrasonic energy controller 31 into high-intensity ultrasonic waves and irradiate the liquid to be measured with the high-intensity ultrasonic waves.
The transducer 32 is disposed below the liquid level of the liquid to be measured, so that the generated high-intensity ultrasonic waves can effectively act on the liquid to be measured, and the ultrasonic waves emitted by the transducer 32 can be ensured to completely act on the liquid to be measured. The high-intensity ultrasonic waves are irradiated to the liquid to be measured in order to allow dissolved oxygen or bubbles in the liquid to be measured to absorb the ultrasonic waves, to precipitate and expand, so that the liquid to be measured can be detected more easily, and the region to be measured is usually located below the central liquid level of the ultrasonic wave irradiation region. Thus, the transducer 32 may be disposed at the bottom of a container storing the liquid to be measured.
To allow the bubble to expand more, and be more easily detected, the transducer 32 may preferably be a high intensity focused ultrasound transducer. The beams of the high intensity focused ultrasound waves are focused, and the high intensity ultrasound waves may be parallel, and the high intensity ultrasound waves can be focused through focusing, so that higher ultrasound intensity can be obtained.
In order to ensure the detection effect of the oxygen content, the sound intensity of the ultrasonic waves received by the region to be detected needs to be ensured>10W/cm2(10 watts per square centimeter), preferably 20W to 50W/cm2。
The frequency selection range of the high-intensity focused ultrasonic wave is 0.7MHz-1.6MHz, so that the gas in water has high absorption rate to ultrasonic energy.
Accordingly, the ultrasonic energy controller 31 and transducer 32 are selected to be capable of supporting the above-described acoustic intensity and high intensity ultrasonic frequencies.
Because the high-intensity ultrasonic waves generated by the high-intensity focused ultrasonic transducer are used for irradiating the liquid, cavitation can occur at the focal position of the high-intensity focused ultrasonic waves, namely cavitation bubbles are generated, and the cavitation bubbles can be mistaken for bubbles, so that the detection precision is influenced, therefore, the preferable region to be detected can be selected in the range of 2-5 cm below the focal point on the central axis of the transducer 32. Bubbles are most observed in this range and are not affected by cavitation effects.
Preferably, in actual use, an operator can control the start and stop of the high-intensity ultrasonic wave generating device 3 by controlling the image processing device 2, so that the image processing device 2 is connected to the high-intensity ultrasonic wave generating device 3, and a first timer and a first timing duration are preset in the image processing device 2.
The image processing apparatus 2 is configured to, upon receiving a system start instruction from a user, send a first start signal to the high-intensity ultrasonic wave generation apparatus 3 to control the high-intensity ultrasonic wave generation apparatus 3 to start, and at this time (i.e., when the first start signal is sent to the high-intensity ultrasonic wave generation apparatus 3), start timing by a first timer. And when the first timed period is reached, the image processing device 2 is used for sending a first stop signal to the high-intensity ultrasonic wave generation device 3 so as to control the high-intensity ultrasonic wave generation device 3 to stop.
The high-intensity ultrasonic wave generating device 3 is specifically configured to generate the high-intensity ultrasonic wave upon receiving a first start signal transmitted from the image processing device 2, and to stop generating the high-intensity ultrasonic wave upon receiving a first stop signal transmitted from the image processing device 2.
Preferably, the first timer period may be set to 2-5 s.
If the accurate oxygen content does not need to be known, the bubble content in unit area can be directly used as the basis for judging whether the medium water meets the requirement or not after the bubble content in unit area is calculated, so that whether the medium water needs to be replaced or not is determined.
Therefore, a first threshold may be preset in the image processing apparatus 2, and the first threshold may be used as a criterion for determining the content of bubbles in a unit area to determine the level of the oxygen content in the medium water, and the first threshold may be selected in a range of 3% to 20% according to different application scenarios.
The image processing device 2 is further configured to compare the calculated bubble content per unit area with a first threshold, and when the bubble content per unit area is greater than the first threshold, it indicates that the oxygen content of the medium water is too high and does not meet the requirement of the high-intensity focused ultrasound therapy, and may alarm to notify the user to replace the medium water.
In the application scenario of high-intensity focusing therapy, if the requirement on the detection accuracy of the oxygen content of the medium water is high, the oxygen dissolution amount of the medium water needs to be further determined after the calculated bubble content per unit area, which requires calibrating the corresponding relationship between the bubble content per unit area and the oxygen dissolution amount.
The corresponding relation between the bubble content and the oxygen dissolution amount in unit area can be obtained through experiments, namely, the main precision dissolved oxygen detector is used for respectively detecting the oxygen dissolution amount under the bubble content in different unit areas, and a curve graph of the bubble content and the oxygen dissolution amount in unit area is established.
The correspondence between the bubble content per unit area and the oxygen dissolution amount can be shown in table 1:
TABLE 1
| Numbering | Bubble content (%) | Oxygen dissolved amount ppm |
| P1 | 0 | 0 |
| P2 | 1 | 1 |
| P3 | 2 | 2.5 |
| P4 | 3 | 4 |
| P5 | 5 | 10 |
In table 1, 5 sets of data were detected, and the bubble content per unit area was: the oxygen content at 0%, 1%, 2%, 3% and 5% was 0, 1, 2.5, 4 and 10, respectively. As known to those skilled in the art, any group of detection data can be taken, and the content of the bubbles in the unit area of each group can be selected according to actual needs.
The bubble content per unit area in table 1 may be divided into a plurality of sections (for example, into 4 sections), and the oxygen dissolution amount in each section is linearly related to the bubble content per unit area.
The correspondence between the bubble content per unit area and the oxygen dissolution amount is preset in the image processing apparatus 2.
The image processing device 2 is further configured to query the corresponding relationship between the bubble content and the oxygen dissolution amount in the unit area according to the calculated bubble content in the unit area, to obtain the oxygen dissolution amount corresponding to the bubble content in the unit area, that is, to obtain the corresponding oxygen dissolution amount according to the calculated bubble content in the unit area query table 1, so as to determine the oxygen content of the liquid to be measured.
If the calculated bubble content per unit area cannot be searched in table 1, determining which bubble content interval per unit area the calculated bubble content per unit area falls into in table 1, and then obtaining the oxygen dissolution amount corresponding to the bubble content per unit area by a linear interpolation algorithm according to the linear relation between the bubble content per unit area and the oxygen dissolution amount in the interval.
For example, if the bubble content per unit area is x equal to 1.5%, the slope of the curve of the bubble content per unit area and the oxygen dissolution amount in the same interval of the bubble content per unit area is the same if linear interpolation is employed. The bubble content per unit area of 1.5% falls within the block segment from P2 to P3, so that the slope k ═ y-P2.y)/(x-P2.x ═ P3.y-P2.y)/(P3.x-P2.x) ═ 2.5-1)/(2-1) ═ 1.5, the oxygen dissolution corresponding to a bubble content per unit area of 1.5% is:
y＝k*(x-p2.x)+p2.y＝1.5*(1.5-1)+1＝1.75ppm
it should be noted that, the embodiment of the present invention is described by taking a linear interpolation algorithm as an example, however, it is known to those skilled in the art that any algorithm capable of calculating a corresponding oxygen dissolution amount according to a bubble content per unit area is within the protection scope of the present invention, for example, a curve interpolation algorithm may be used to calculate the oxygen dissolution amount, or an interpolation algorithm for more than 2 times, such as a B-spline interpolation algorithm, may be used to calculate the oxygen dissolution amount, and the curve interpolation algorithm and the B-spline interpolation algorithm belong to the prior art, and are not described herein again.
Further, a second threshold may be preset in the image processing apparatus 2, and the second threshold may be used as a criterion for determining the oxygen content of the bubbles in a unit area, so as to determine the oxygen content of the medium water, and the second threshold may be selected in a range of 3-6ppm according to different application scenarios.
The image processing device 2 is further configured to compare the obtained oxygen dissolution amount corresponding to the bubble content per unit area with a second threshold, and when the oxygen dissolution amount corresponding to the bubble content per unit area is greater than the second threshold, it indicates that the oxygen content of the medium water is too high and does not meet the requirement of the high-intensity focused ultrasound therapy, and an alarm may be given to notify the user to replace the medium water.
In order to clearly illustrate the technical solution of the present invention, the structure and the detection method of the liquid oxygen content detection system are respectively described in detail by 3 embodiments below.
Example 1
Referring to fig. 2, a schematic structural diagram of a liquid oxygen content detection system provided in embodiment 1 of the present invention is shown, in which medium water for ultrasonic thermotherapy is stored in a container 4, the detection system may include: an image detection apparatus 1, an image processing apparatus 2, and a high-intensity ultrasonic wave generation apparatus 3, the high-intensity ultrasonic wave generation apparatus 3 including: an ultrasound intensity controller 31 and a transducer 32.
The image processing device 2 is respectively connected with the image detection device 1 and the ultrasonic energy controller 31, the ultrasonic energy controller 31 is also connected with the transducer 32, and the transducer 32 is arranged at the bottom of the container 4 storing the medium water and is positioned below the water surface of the medium water.
In embodiment 1, the image detection device 1 is an optical image acquisition device, and may specifically adopt a camera, such as a CCD (Charge-coupled device) camera. The CCD camera is located below the level of the medium water, may be provided on the side wall of the container 4, and is capable of collecting optical image signals in a direction parallel to the level of the medium water. If the side wall of container 4 is transparent, the CCD camera can be adorned on the outer wall, if the side wall of container 4 is opaque, then need install the CCD camera in the inboard of the side wall of container 4, the CCD camera can direct and medium water contact like this, therefore the CCD camera needs to possess waterproof function. When the high-intensity ultrasonic wave generating device 3 irradiates the medium water with the generated high-intensity ultrasonic waves, the CCD camera synchronously collects optical image signals of bubbles formed by the medium water.
The image processing apparatus 2 is preset with: the device comprises a first timer and a first timing duration.
The image processing device 2 is configured to, when receiving a system start instruction from a user, send a first start signal to the ultrasonic energy controller 31 to control the ultrasonic energy controller 31 to generate a high-frequency current, and send a third start signal to a camera (image detection device) to control the camera to start acquiring an optical image signal, where the first timer starts timing. When the first timing duration is reached, sending a first stop signal to the ultrasonic energy controller 31 to control the ultrasonic energy controller 31 to stop generating the high-frequency current, and sending a third stop signal to the camera to control the camera to stop collecting the optical image signal; and calculating the bubble content in unit area according to the optical image signal collected by the camera.
The ultrasonic energy controller 31 is configured to generate a high-frequency current upon receiving a first start signal transmitted by the image processing apparatus 2, and transmit the generated high-frequency current to the transducer 32, so that the transducer 32 generates a high-frequency ultrasonic wave. And stopping the generation of the high-frequency current upon receiving the first stop signal transmitted by the image processing apparatus 2.
The transducer 32 is used for converting the high-frequency current sent by the ultrasonic energy controller 31 into high-intensity ultrasonic waves, and irradiating the medium water with the high-intensity ultrasonic waves to enable the gas in the medium water to absorb energy to expand.
The image detection device 1 is used for collecting an optical image signal of bubbles formed by gas in the medium water in a direction parallel to the horizontal plane of the medium water when receiving a third starting signal sent by the image processing device 2; and when receiving a third stop signal sent by the image processing device 2, stopping collecting the optical image signal of the bubbles formed by the gas in the medium water.
Further, the image processing apparatus 2 can also calibrate the correspondence between the bubble content per unit area and the oxygen dissolution amount in advance, determine the corresponding oxygen dissolution amount according to the calculated bubble content per unit area, and further determine whether the medium water needs to be replaced according to the oxygen dissolution amount. The calculated oxygen dissolution amount corresponding to the bubble content per unit area is determined, and the process of judging whether the medium water needs to be replaced is as described above, which is not repeated herein.
The technical scheme that the image detection device 1 adopts the optical image acquisition device is suitable for scenes with low requirements on the detection precision of the oxygen content of liquid, such as bubble detection in a transfusion tube and detection of the air content of medium water for ultrasonic thermotherapy.
Example 2
Referring to fig. 3, a schematic structural diagram of a liquid oxygen content detection system provided in embodiment 2 of the present invention is shown, in which medium water for high intensity focused ultrasound therapy is stored in a container 4, the detection system may include: an image detection apparatus 1, an image processing apparatus 2, and a high-intensity ultrasonic wave generation apparatus 3, the high-intensity ultrasonic wave generation apparatus 3 including: an ultrasonic energy controller 31 and a transducer 32.
Embodiment 2 differs from embodiment 1 in that the image detection apparatus 1 employs a different device, and the image processing apparatus 2 controls the image detection apparatus 1 in embodiment 2 differently from the image processing apparatus 1 in embodiment 1.
In embodiment 2, the image detection apparatus 1 may include: the ultrasonic imaging device 12 can be a B-ultrasonic machine, and the ultrasonic probe 11 is arranged below the water surface of the medium water in the container.
The ultrasonic probe 11 is respectively connected with the ultrasonic imaging device 12 and the image processing device 2 and is used for generating detection ultrasonic waves according to the control of the image processing device 2 so as to irradiate the medium water in the container 4 with the detection ultrasonic waves; receiving an echo signal and sending the echo signal to the ultrasonic imaging device 12, wherein the echo signal is generated after the detection ultrasonic wave emitted by the ultrasonic probe 11 encounters the air bubbles in the medium water; and stopping generation of the probe ultrasonic wave according to control of the image processing apparatus 1.
The probe ultrasonic wave is a relatively low-energy ultrasonic wave, and preferably, the sound intensity of the probe ultrasonic wave<1W/cm2。
The ultrasound probe 11 may be placed in the middle of the transducer 32 for better focusing.
The ultrasonic imaging device 12 is connected to the image processing apparatus 1, and is configured to convert the received echo signal into an ultrasonic image signal and send the ultrasonic image signal to the image processing apparatus 1.
In embodiment 2, a second timer, a third timer, a second timed period, and a third timed period are also preset in the image processing apparatus 2. Preferably, the first timer period may be set to 2-5s, and the third timer period may be set to 1 s.
The image processing device 2 is used for starting timing by the second timer when the first timing duration is reached; when the second timing duration is reached, the third timer starts timing and sends a second starting signal to the ultrasonic probe 11 to control the ultrasonic probe 11 to generate detection ultrasonic waves; when the third timing length arrives, sending a second stop signal to the ultrasonic probe 11 to control the ultrasonic probe 11 to stop generating the detection ultrasonic wave; and calculating the bubble content per unit area based on the ultrasonic imaging signal transmitted from the ultrasonic imaging device 12.
Since the ultrasonic imaging device 12 (B-ultrasonic machine) also works by using ultrasonic waves, and the ultrasonic probe 11 also emits a detection ultrasonic wave with a certain frequency, in order not to interfere with the high-intensity ultrasonic wave emitted by the transducer 32, the image detection apparatus 1 (i.e., the ultrasonic probe 11) is controlled to start after a certain time interval after the high-intensity ultrasonic wave generation apparatus 3 is stopped. The time period (i.e., the second timing period) between the start of the image detection apparatus 1 and the stop of the high-intensity ultrasonic wave generation apparatus 3 cannot be set too long or too short, and if the second timing period is too long, the formed bubbles will shrink, and if the second timing period is too short, the high-intensity ultrasonic waves will be disturbed, which affects the accuracy of the detection result, and therefore, preferably, the second timing period may be set to 0.1 to 0.5 s.
Further, the image processing apparatus 2 can also calibrate the correspondence between the bubble content per unit area and the oxygen dissolution amount in advance, determine the corresponding oxygen dissolution amount according to the calculated bubble content per unit area, and further determine that the medium water needs to be replaced according to the oxygen dissolution amount. The calculated oxygen dissolution amount corresponding to the bubble content per unit area is determined, and the process of judging whether the medium water needs to be replaced is as described above, which is not repeated herein.
In embodiment 2, the image detection apparatus 1 employs an ultrasonic probe and a B-ultrasonic machine, and since the B-ultrasonic machine is used for ultrasonic imaging, the imaging effect is better than that of optical imaging, and therefore, the detection accuracy is higher, and the apparatus can be applied to application scenarios in which the gas content in liquid is strictly controlled, such as high-intensity focusing therapy.
Example 3
Embodiment 3 of the present invention provides a method for detecting an oxygen content of a liquid, including the following steps:
step a, emitting high-intensity ultrasonic waves to the liquid to be detected, namely irradiating the liquid to be detected by using the high-intensity ultrasonic waves to enable gas in the liquid to be detected to form bubbles.
Specifically, a transducer in the high-intensity ultrasonic wave generating device may be used to emit high-intensity ultrasonic waves to the liquid to be measured.
And b, selecting a certain area with bubbles formed by gas in the liquid to be detected as an area to be detected, and calculating the content of the bubbles in unit area in the area to be detected.
The area where the bubbles are concentrated generally refers to the area of the liquid to be measured, which is located on the central axis of the transducer and 2-5 cm below the focal point. Since the bubbles are most observed in this region and the region is not affected by cavitation effects. The region to be measured can thus be selected within the area range mentioned above.
Preferably, step b may specifically include the following steps:
b1, acquiring an image of bubbles formed by gas in the liquid to be detected, selecting an area with the most concentrated bubbles on the acquired image as an area to be detected, and calculating the total number of pixels in the area to be detected;
b2, identifying the bubbles in the region to be detected, and calculating the sum of the number of the image pixels occupied by the bubbles in the region to be detected;
preferably, an image of a region in which the bubbles formed by the gas in the liquid to be measured are more concentrated may be acquired by the image detection device, and a region in which a certain bubble is most concentrated may be selected from the image as the region to be measured. Specifically, the image detection device may be arranged at a position corresponding to the area range in which the bubbles are more concentrated, so that the image detection device can collect an image of the bubbles in the area range, and the user may select an area in which the bubbles are most concentrated from the collected image as the area to be measured;
and b3, calculating the ratio of the total number of pixels in the region to be detected to the total number of pixels occupied by the bubbles in the region to be detected, and obtaining the bubble content in unit area.
Specifically, the bubble content per unit area of the region to be measured may be calculated by an image processing apparatus or may be calculated manually.
The content of bubbles per unit area corresponds to the amount of oxygen dissolved, and is specifically shown in table 1. Therefore, preferably, the method further comprises the steps of:
and c, determining the oxygen dissolving amount corresponding to the bubble content in the unit area according to the calculated bubble content in the unit area.
Specifically, the corresponding relationship between the bubble content and the oxygen dissolution amount in the unit area can be queried according to the calculated bubble content in the unit area, so as to obtain the oxygen dissolution amount corresponding to the bubble content in the unit area, and determine the oxygen content of the liquid to be measured.
In the process of the high-intensity focused ultrasound treatment, the oxygen content of the medium water is constantly changed, so that the medium water needs to be changed regularly, namely the medium water used for the high-intensity focused ultrasound treatment conduction is discharged at intervals, and then the degassed medium water is introduced again to be used as the high-intensity focused ultrasound conduction medium water. However, under different environmental temperatures, the dissolution rate of oxygen in water is different, so the water changing time interval is difficult to control, the water changing time interval is short, waste is caused, and the oxygen dissolution amount is too high when the water changing time interval is long, so the requirement of high-intensity focused ultrasound treatment cannot be met. The existing scheme is that the oxygen content of the medium water is detected manually and periodically, so that the problems of untimely detection, time waste and labor waste are caused.
By utilizing the liquid oxygen content detection system and method, the water change control of the medium water can be realized. Specifically, a detection period may be set in the image processing apparatus 2, and the image processing apparatus 2 may control the high-intensity ultrasonic wave generation apparatus 3 to generate the high-intensity ultrasonic wave in accordance with the detection period.
The setting of the detection period can be different according to the model of the degassing equipment and the environment, and preferably, the detection period can be set to be 20-30 min.
When the detection period is up, the liquid oxygen content detection system detects the oxygen content of the medium water, when the bubble content per unit area is more than 20%, or when the oxygen dissolution amount is more than 5ppm, the medium water is considered to be required to be replaced, and the liquid oxygen content detection system can give an alarm.
The liquid oxygen content detection system is used for periodically detecting the oxygen content of the medium water, so that the labor cost can be reduced, the missing detection is avoided, and the timely water change is ensured in the high-intensity focused ultrasound treatment process.
The liquid oxygen content detection system and the liquid oxygen content detection method can also be used for detecting the degassing capacity of the water treatment device, if the medium water degassed by the water treatment device still has more bubbles, the water treatment device is indicated to be faulty, and the medium water does not meet the requirement of treatment water.
After the medium water is replaced, the liquid oxygen content detection system is used for detecting the oxygen content of the medium water immediately, if the oxygen content exceeds the standard, the water treatment device is in failure (degassing does not reach the standard), for example, when the bubble content in unit area is more than 3 percent, or when the oxygen content is more than 3ppm, the oxygen content is considered to exceed the standard, the liquid oxygen content detection system of the invention sends out an alarm and informs maintenance personnel to treat the water.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (12)
1. A liquid oxygen content detection system, comprising: an image detection device, an image processing device and a high-intensity ultrasonic wave generation device;
the high-intensity ultrasonic wave generating device is used for generating high-intensity ultrasonic waves, and the high-intensity ultrasonic waves generated by the high-intensity ultrasonic wave generating device are utilized to irradiate the liquid to be detected so as to enable the gas in the liquid to be detected to form bubbles;
the image detection device is used for acquiring an image signal of bubbles formed by gas in the liquid to be detected;
the image processing device is connected with the image detection device and used for calculating the bubble content in unit area according to the image signals collected by the image detection device.
2. The system of claim 1, wherein the high intensity ultrasound generating means comprises: an ultrasonic energy controller and a transducer;
the super-intensity energy controller is respectively connected with the energy converter and the image processing device and is used for generating high-frequency current and sending the high-frequency current to the energy converter;
the energy converter is arranged in a container for storing the liquid to be detected, is arranged below the liquid level of the liquid to be detected, and is used for converting high-frequency current sent by the ultrasonic energy controller into high-intensity ultrasonic waves and irradiating the liquid to be detected by utilizing the high-intensity ultrasonic waves.
3. The system according to claim 1, wherein the image processing device is further connected to the high intensity ultrasound generating device, and a first timer and a first timed duration are preset in the image processing device;
the image processing device is used for sending a first starting signal to the high-intensity ultrasonic wave generating device, and when the first starting signal is sent to the high-intensity ultrasonic wave generating device, a first timer starts to time; when the first timing duration is up, sending a first stop signal to the high-intensity ultrasonic wave generating device;
the high-intensity ultrasonic wave generating device is specifically used for generating high-intensity ultrasonic waves when receiving a first starting signal sent by the image processing device; and stopping generating the high-intensity ultrasonic wave when receiving a first stop signal transmitted by the image processing device.
4. The system of claim 3, wherein the image detection device comprises: the ultrasonic probe is arranged below the liquid level of the liquid to be detected;
the ultrasonic probe is respectively connected with the ultrasonic imaging equipment and the image processing device and used for generating detection ultrasonic waves according to the control of the image processing device and irradiating the liquid to be detected by using the detection ultrasonic waves; receiving an echo signal and sending the echo signal to ultrasonic imaging equipment, wherein the echo signal is generated when the low-intensity ultrasonic waves meet bubbles in liquid to be detected; and stopping generation of the probe ultrasonic wave according to control of the image processing apparatus;
the ultrasonic imaging equipment is connected with the image processing device and used for converting the received echo signals into ultrasonic image signals and sending the ultrasonic image signals to the image processing device;
the image processing device is specifically configured to calculate the bubble content per unit area according to an ultrasonic imaging signal sent by an ultrasonic imaging device.
5. The system according to claim 4, wherein a second timer, a third timer, a second timing duration and a third timing duration are preset in the image processing apparatus, wherein the first timing duration is longer than the third timing duration and longer than the second timing duration;
the image processing device is also used for starting timing by a second timer when the first timing duration is reached; when the second timing duration is reached, the third timer starts timing and sends a second starting signal to the ultrasonic probe so as to control the ultrasonic probe to generate detection ultrasonic waves; and when the third timing time reaches, sending a second stop signal to the ultrasonic probe to control the ultrasonic probe to stop generating the detection ultrasonic wave.
6. The system of claim 5, wherein the first timing period is 2-5S and the second timing period is 0.1-0.5S.
7. The system of claim 3, wherein the image detection device is an optical image acquisition device;
the optical image acquisition device is arranged below the liquid level of the liquid to be detected, and is specifically used for acquiring optical image signals of bubbles formed by gas in the liquid to be detected in a direction parallel to the horizontal plane of the liquid to be detected when the high-intensity ultrasonic wave generation device irradiates the liquid to be detected with the generated high-intensity ultrasonic waves;
the image processing device is specifically used for calculating the bubble content in unit area according to the optical image signal acquired by the optical image acquisition device.
8. The system of claim 7, wherein the image processing device is further configured to send a third activation signal to the optical image acquisition device when the first activation signal is sent to the high intensity ultrasound generation device; when the first timing duration is up, sending a third stop signal to the optical image acquisition device;
the optical image acquisition device is specifically used for acquiring an optical image signal of bubbles formed by gas in the liquid to be detected in a direction parallel to the horizontal plane of the liquid to be detected when receiving a third starting signal sent by the image processing device; and when a third stop signal sent by the image processing device is received, stopping collecting the optical image signal of the bubbles formed by the gas in the liquid to be measured.
9. The system according to any one of claims 1 to 8, wherein the image processing device is also preset with the corresponding relation between the content of bubbles per unit area and the oxygen dissolving amount;
and the image processing device is also used for inquiring the corresponding relation between the bubble content and the oxygen dissolution amount of the unit area according to the calculated bubble content of the unit area to obtain the oxygen dissolution amount corresponding to the bubble content of the unit area.
10. The system according to claim 9, wherein a first threshold value is preset in the image processing device; the image processing device is also used for comparing the calculated bubble content per unit area with the first threshold value, and alarming when the bubble content per unit area is greater than the first threshold value; or,
a second threshold value is also preset in the image processing device; and the image processing device is also used for comparing the obtained oxygen dissolution amount corresponding to the bubble content of the unit area with the second threshold value, and alarming when the oxygen dissolution amount corresponding to the bubble content of the unit area is larger than the second threshold value.
11. A method for detecting the oxygen content of liquid is characterized by comprising the following steps:
transmitting high-intensity ultrasonic waves to liquid to be detected so as to enable gas in the liquid to be detected to form bubbles;
and selecting a region with bubbles in the liquid to be detected as a region to be detected, and calculating the bubble content of the region to be detected in unit area.
12. The method according to claim 11, wherein the selecting a region with bubbles in the liquid to be measured as a region to be measured and calculating the bubble content per unit area in the region to be measured specifically comprises:
collecting an image of bubbles formed by gas in the liquid to be detected, selecting an area with the most concentrated bubbles on the collected image as an area to be detected, and calculating the total number of pixels in the area to be detected;
identifying bubbles in the region to be detected, and calculating the sum of the number of pixels occupied by the bubbles in the region to be detected;
and calculating the ratio of the total number of pixels in the region to be detected to the total number of pixels occupied by the bubbles in the region to be detected to obtain the bubble content in unit area.
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Address after: No. 359, jingdongfang Avenue, Beibei District, Chongqing 400714 Patentee after: Chongqing Haifu Medical Technology Co.,Ltd. Address before: 401121 No. 1 Pine Road, man Town, Chongqing, Yubei District Patentee before: Chongqing Haifu Medical Technology Co.,Ltd. |