Bubble and impurity concentration on-line detection unit, method and applications

Abstract

The application discloses a kind of bubble and impurity concentration on-line detection unit, including the light-emitting element of being arranged in turn, light path conversion lens, detection waterway and photosensitive element, the emission light of light-emitting element reaches photosensitive element in turn through light path conversion lens, detection waterway, light-emitting element, photosensitive element are electrically connected control calculation unit;Light path conversion lens converts emission light into the parallel light beam same with the flow direction of detection waterway, the axis of parallel light beam coincides with the axis of detection waterway, and parallel light beam is vertical with the photosensitive surface of photosensitive element.The application also discloses the detection method of this kind of bubble and impurity concentration on-line detection unit and its application in water immersion ultrasonic detection field.The application can on-line real-time detection of deionized water purity, avoid the measurement error and misjudgment caused by the impurity and bubble existing in deionized water, improve sample detection precision and efficiency.

Description

Technical Field

[0001] This invention relates to the field of water immersion ultrasonic testing technology, and in particular to an online detection unit, method and application for bubble and impurity concentration. Background Technology

[0002] Water immersion ultrasonic testing detects defects in materials by transmitting ultrasonic waves through water. An ultrasonic transmitter and receiver (hereinafter referred to as the "probe") generates ultrasonic waves of a specific frequency, which are transmitted to the object under test using deionized water as the coupling medium. When the ultrasonic waves encounter interfaces between materials of different densities, they are reflected. By measuring the propagation time and distance of the ultrasonic waves within the object, the location of defects in the tested material can be detected and calculated.

[0003] For high-precision testing, trace impurities or air bubbles in deionized water can cause attenuation of the ultrasonic signal, thus affecting the accuracy and reliability of the test. Specifically, impurities or air bubbles can alter the propagation path of ultrasonic waves in the medium, leading to signal strength loss and potentially causing measurement errors or misjudgments.

[0004] Currently, during water immersion ultrasonic testing, it is often necessary for the testing personnel to visually inspect whether there are impurities and air bubbles in the deionized water. Since impurities and air bubbles are usually small and difficult to detect with the human eye, coupled with the uncertainty of human factors, the test results may have a large deviation. Summary of the Invention

[0005] This invention aims to provide an online detection unit, method, and application for detecting bubble and impurity concentration in deionized water used in water immersion ultrasonic testing. It can detect the purity of deionized water in real time, avoid measurement errors and misjudgments caused by impurities and bubbles in deionized water, and improve the accuracy and efficiency of sample testing.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] This invention discloses an online detection unit for bubble and impurity concentration, comprising a light-emitting element, a light path conversion lens, a detection water path, and a photosensitive element arranged in sequence facing each other. The light emitted by the light-emitting element passes through the light path conversion lens and the detection water path in sequence before reaching the photosensitive element. The light-emitting element and the photosensitive element are electrically connected to a control and calculation unit.

[0008] The optical path conversion lens converts the emitted light into a parallel beam that flows in the same direction as the water path being detected. The axis of the parallel beam coincides with the axis of the water path being detected, and the parallel beam is perpendicular to the photosensitive surface of the photosensitive element.

[0009] Preferably, the optical path conversion lens is a plano-convex lens, the planar side of the plano-convex lens is adjacent to the light-emitting element, and the emitted light is monochromatic light.

[0010] Preferably, the light-emitting element is a point light source, the monochromatic light is infrared light or ultraviolet light, and the point light source is located on the axis of the detection water channel.

[0011] Preferably, the detection water path includes a cavity, the two sides of the cavity facing the planar side of the plano-convex lens are transparent, the photosensitive element is attached to the outer wall of the cavity, and the wall surface of the cavity not facing the planar side of the plano-convex lens is covered with light-absorbing material.

[0012] Furthermore, the cavity is provided with an inlet and an outlet. The inlet is located at the top of the cavity, and the outlet is located at the bottom of the cavity. The inlet and outlet are respectively close to the two ends of the cavity and away from the vertical center line of the cavity. The light-emitting element and the photosensitive element are respectively located on the outer sides of the two ends of the cavity.

[0013] The working principle of this online bubble and impurity concentration detection unit is as follows:

[0014] This invention also discloses a method for detecting bubble and impurity concentration using this online bubble and impurity concentration detection unit, including a method for calculating the bubble and impurity concentration, which is as follows:

[0015] n = (C / A) / 100%;

[0016] Where: n is the concentration of bubbles and impurities, A is the received light intensity without bubbles and impurities, and C is the difference in light intensity attenuation, which is determined by the following formula:

[0017] C=AB;

[0018] Where B is the received light intensity during detection;

[0019] The received light intensity is obtained by processing the signal output by the photosensitive element through the control computing unit.

[0020] The working principle of this online bubble and impurity concentration detection unit is as follows:

[0021] First, the monochromatic point light source is converted into parallel light by the optical path conversion lens. When the deionized water passing through the detection optical path does not contain bubbles or impurities, the light intensity received by the photosensitive element is the maximum. When the deionized water passing through the detection optical path contains bubbles or impurities, the parallel light is reflected, scattered, or refracted due to the reflection, scattering, or refraction effect of the parallel light passing through the bubbles or impurities. The light intensity of the parallel light received by the photosensitive element is reduced. Based on the amount of light intensity reduction, the concentration of bubbles and impurities can be calculated.

[0022] The present invention also discloses the application of the online detection unit for bubble and impurity concentration, wherein the application includes constructing the online detection unit for bubble and impurity concentration into a detection system for online detection of bubble and impurity concentration in deionized water, wherein the deionized water is used for water immersion ultrasonic detection.

[0023] Preferably, the detection system includes an online detection unit for bubble and impurity concentration, a water tank, and a circulating water pump. The inlet is connected to the circulating water outlet of the water tank, the outlet is connected to the inlet of the circulating water pump, and the outlet of the circulating water pump is connected to the circulating water inlet of the water tank.

[0024] Preferably, the circulating water outlet and the circulating water inlet are both located at the lower part of the water tank, and the circulating water outlet and the circulating water inlet are arranged on opposite side walls of the water tank. The upper part of the side wall of the water tank is provided with a water inlet, and the bottom of the water tank is provided with a drain outlet.

[0025] Among them: the online detection unit for bubble and impurity concentration is used to test the concentration of bubbles and impurities in deionized water; the circulating water pump is used to make the deionized water in the water tank flow slowly, which facilitates the online detection of the concentration of bubbles and impurities in the deionized water in the water tank.

[0026] This invention can detect the purity of deionized water online in real time. It is particularly suitable for detecting impurities and bubble concentration in the medium (deionized water) used in water immersion ultrasonic testing. It avoids measurement errors and misjudgments caused by impurities and bubbles in deionized water, and improves the accuracy and efficiency of sample testing. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the online detection unit for bubble and impurity concentration.

[0028] Figure 2 This is a schematic diagram of the principle of the online detection unit for bubble and impurity concentration.

[0029] Figure 3 This is a schematic diagram of the water flow direction and path for the online detection unit for bubble and impurity concentration.

[0030] Figure 4 A schematic diagram of the light propagation path for the online detection unit of bubble and impurity concentration.

[0031] Figure 5 This is a schematic diagram of converting a point light source into parallel light.

[0032] Figure 6 This is a graph showing the relationship between bubble and impurity concentration and light intensity.

[0033] Figure 7 This is a schematic diagram illustrating the detection principle of the online detection unit for bubble and impurity concentration.

[0034] Figure 8 This is a schematic diagram of an online detection system for bubble and impurity concentration.

[0035] Figure 9 This is a schematic diagram of the composition of an online bubble and impurity concentration detection system. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings.

[0037] Example 1

[0038] This embodiment discloses an online detection unit for bubble and impurity concentration, as detailed below:

[0039] like Figure 1 , Figure 2 As shown, the online bubble and impurity concentration detection unit 1 includes a light-emitting element 11, a photosensitive element 14, a light path conversion lens 12, a detection light path 13, and a control and calculation unit 15. The light-emitting element 11, the light path conversion lens 12, the detection light path 13, and the photosensitive element 14 are arranged in sequence facing each other.

[0040] Wherein: the optical path conversion lens 12 is a plano-concave lens, the detection water path 13 includes a cavity, the two sides of the cavity that are directly opposite the planar side of the plano-convex lens are transparent, the photosensitive element 14 is attached to the outer wall of the cavity, and the wall surface of the cavity that is not directly opposite the planar side of the plano-convex lens is covered with light-absorbing material 133.

[0041] The cavity is provided with an inlet 131 and an outlet 132. The inlet 131 is located at the top of the cavity, and the outlet 132 is located at the bottom of the cavity. The inlet 131 and the outlet 132 are respectively close to the two ends of the cavity and far away from the vertical center line of the cavity. The light-emitting element 11 and the photosensitive element 14 are respectively located on the outer side of the two ends of the cavity.

[0042] In this embodiment, the control calculation unit 15 displays the measured concentration through the concentration display unit 151, and the power supply unit 16 supplies power to the control calculation unit 15, the light-emitting element 11, and the photosensitive element 14.

[0043] like Figure 3 As shown, the water flow direction of the online bubble and impurity concentration detection unit 1 is from the side of the light-emitting element 11 to the side of the photosensitive element 14, and the center line 17 of the main flow path coincides with the center line of the light-emitting element 11 and the photosensitive element 14.

[0044] like Figure 4 As shown, in this type of online bubble and impurity concentration detection unit, the propagation path of the detection light 18 is parallel to the main flow path of the water.

[0045] like Figure 5 As shown, in this embodiment, the light-emitting element 11 is a point light source that emits monochromatic light, which can be infrared light or ultraviolet light. The point light source is converted into parallel light 19 by the optical path conversion lens 12. The outer side of the optical path of the parallel light 19 is covered by a light-absorbing material 133 to prevent the scattered and refracted light from bubbles and impurities from being reflected again, thus affecting the accuracy of the detection results.

[0046] The photosensitive element 14 receives parallel light 19 after passing through deionized water and generates a light intensity signal. The light intensity signal generated by the photosensitive element 14 is converted into a concentration value by the control and calculation unit 15.

[0047] The light-emitting element 11 and the photosensitive element 14 need to operate at the same wavelength. For example, if the light-emitting element 11 produces infrared light of 940nm, then the nominal operating wavelength of the photosensitive element 14 should also be 940nm; if the light-emitting element 11 produces ultraviolet light of 300nm, then the nominal operating wavelength of the photosensitive element 14 should also be 300nm.

[0048] Example 2

[0049] Based on Example 1, this example discloses a method for online detection of bubble and impurity concentration using such an online bubble and impurity concentration detection unit.

[0050] The relationship between the concentration of bubbles and impurities and the light intensity received by the photosensitive element is as follows: Figure 6 As shown, it can be seen that its decay is basically linear.

[0051] like Figure 7 As shown, firstly, the light-emitting element 11 is converted into parallel light 19 by the optical path conversion lens 12. When the deionized water passing through the detection optical path 13 does not contain bubbles 2 or impurities 3, the light intensity received by the photosensitive element 14 is at its maximum, and this light intensity is marked as A. When the deionized water passing through the detection optical path 13 contains bubbles 2 or impurities 3, due to the reflection, scattering, or refraction effect of the parallel light 19 as it passes through the bubbles 3 or impurities 2, the light intensity received by the photosensitive element 14 is weakened, and this light intensity is marked as B. The difference in light intensity is marked as C, i.e., C=AB. The value of C is related to the concentration of bubbles 32 or impurities in the deionized water passing through the detection optical path 13; the higher the concentration, the larger C is. The formula for calculating the concentration is: Concentration = C / A × 100%. When the photosensitive element 14 cannot receive the parallel light 19 emitted by the light-emitting element 11, the light intensity is 0.

[0052] Example 3

[0053] Based on Examples 1 and 2, this example discloses the application of this online bubble and impurity concentration detection unit in the field of water immersion ultrasonic testing, specifically in the online detection of bubble and impurity concentration in deionized water.

[0054] In this embodiment, a detection system is constructed using this type of online bubble and impurity concentration detection unit, such as... Figure 8 , Figure 9As shown, the detection system includes an online bubble and impurity concentration detection unit 1, a water tank 4, and a circulating water pump 5. The inlet 131 of the online bubble and impurity concentration detection unit 1 is connected to the circulating water outlet 42 of the water tank 4 through a first and second pipeline 51. The outlet 132 is connected to the inlet of the circulating water pump 4 through a pipeline 52. The outlet of the circulating water pump 4 is connected to the circulating water inlet 41 of the water tank 4 through a pipeline 53. The circulating water outlet 42 and the circulating water inlet 41 are both located at the lower part of the water tank 4 and are arranged on opposite side walls of the water tank. A water inlet 43 is provided on the upper part of the side wall of the water tank 4, and a drain outlet 44 is provided at the bottom of the water tank 4.

[0055] The concentration display unit 151 can be a separate purity display unit or an alarm unit; it can also be a PC integrated with the ultrasonic detection system.

[0056] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. An online detection unit for bubble and impurity concentration, characterized in that, It includes a light-emitting element, a light path conversion lens, a detection water path, and a photosensitive element arranged in sequence facing each other. The light emitted by the light-emitting element passes through the light path conversion lens and the detection water path in sequence before reaching the photosensitive element. The light-emitting element and the photosensitive element are electrically connected to a control and calculation unit. The optical path conversion lens converts the emitted light into a parallel beam that flows in the same direction as the water path being detected. The axis of the parallel beam coincides with the axis of the water path being detected, and the parallel beam is perpendicular to the photosensitive surface of the photosensitive element.

2. The online bubble and impurity concentration detection unit according to claim 1, characterized in that, The optical path conversion lens is a plano-convex lens, with the planar side of the plano-convex lens adjacent to the light-emitting element, and the emitted light is monochromatic light.

3. The online bubble and impurity concentration detection unit according to claim 2, characterized in that, The light-emitting element is a point light source, and the monochromatic light is infrared light or ultraviolet light. The point light source is located on the axis of the detection water channel.

4. The online bubble and impurity concentration detection unit according to claim 2, characterized in that, The detection water path includes a cavity, the two sides of the cavity facing the planar side of the plano-convex lens are transparent, the photosensitive element is attached to the outer wall of the cavity, and the wall surface of the cavity not facing the planar side of the plano-convex lens is covered with light-absorbing material.

5. The online bubble and impurity concentration detection unit according to claim 4, characterized in that, The cavity is provided with an inlet and an outlet. The inlet is located at the top of the cavity, and the outlet is located at the bottom of the cavity. The inlet and outlet are respectively close to the two ends of the cavity and away from the vertical center line of the cavity. The light-emitting element and the photosensitive element are respectively located on the outer side of the two ends of the cavity.

6. A method for online detection of bubble and impurity concentration, characterized in that, The method employs the online detection unit for bubble and impurity concentration as described in any one of claims 1-5.

7. The method for online detection of bubble and impurity concentration according to claim 6, characterized in that, The method for calculating the concentration of bubbles and impurities is as follows: n = (C / A) / 100%; Where: n is the concentration of bubbles and impurities, A is the received light intensity without bubbles and impurities, and C is the difference in light intensity attenuation, which is determined by the following formula: C=AB; Where B is the received light intensity during detection; The received light intensity is obtained by processing the signal output by the photosensitive element through the control computing unit.

8. The application of the online bubble and impurity concentration detection unit as described in claim 5, characterized in that, The system includes an online detection unit for detecting bubble and impurity concentrations, which is used for online detection of bubble and impurity concentrations in deionized water, wherein the deionized water is used for water immersion ultrasonic testing.

9. The application according to claim 8, characterized in that: The detection system includes an online detection unit for bubble and impurity concentration, a water tank, and a circulating water pump. The inlet is connected to the circulating water outlet of the water tank, the outlet is connected to the inlet of the circulating water pump, and the outlet of the circulating water pump is connected to the circulating water inlet of the water tank.

10. The application according to claim 9, characterized in that, The circulating water outlet and circulating water inlet are both located at the bottom of the water tank. The circulating water outlet and circulating water inlet are arranged on opposite side walls of the water tank. A water inlet is provided on the upper part of the side wall of the water tank, and a drain outlet is provided at the bottom of the water tank.

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