CN114674756A - Water attenuation length measuring device and method - Google Patents

Water attenuation length measuring device and method Download PDF

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Publication number
CN114674756A
CN114674756A CN202210298075.7A CN202210298075A CN114674756A CN 114674756 A CN114674756 A CN 114674756A CN 202210298075 A CN202210298075 A CN 202210298075A CN 114674756 A CN114674756 A CN 114674756A
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liquid
liquid storage
photoelectric conversion
light source
light
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Chinese (zh)
Inventor
李凯
李会财
陈明君
游晓浩
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Sichuan Tianfu New Area Cosmic Ray Research Center
Institute of High Energy Physics of CAS
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Sichuan Tianfu New Area Cosmic Ray Research Center
Institute of High Energy Physics of CAS
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Priority to CN202210298075.7A priority Critical patent/CN114674756A/en
Publication of CN114674756A publication Critical patent/CN114674756A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N21/03—Cuvette constructions
    • G01N21/031—Multipass arrangements

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
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  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Optical Measuring Cells (AREA)

Abstract

The application discloses water decay length measuring device and method, the device includes: the liquid storage component comprises a liquid storage part, a liquid inlet channel and a liquid outlet channel, the liquid inlet channel and the liquid outlet channel are connected to the liquid storage part, the liquid storage part is vertically arranged, the liquid inlet channel is used for introducing a liquid sample to be detected into the liquid storage part, and the liquid outlet channel is used for discharging the liquid sample to be detected out of the liquid storage part; a light source device provided with a light emitting section; the photoelectric conversion device is provided with a receiving part, the receiving part of the photoelectric conversion device and the light emitting part of the light source device are arranged oppositely, and the liquid sample to be measured is positioned between the receiving part of the photoelectric conversion device and the light emitting part of the light source device. The device can be placed outside the liquid sample to be detected, so that the size of a container for bearing the liquid sample to be detected can be reduced, the container is convenient to carry, and the detection operation is convenient to carry out. The method can directly measure the required water attenuation length and has high measurement precision.

Description

Water attenuation length measuring device and method
Technical Field
The invention relates to the field of measurement, in particular to a water attenuation length measuring device and method.
Background
The attenuation condition of visible light in a water body medium is influenced by various factors, such as solute, conductivity, water color, turbidity and the like, the water body detection is realized by an optical method, the inherent optical property of water quality can be researched by measuring the water attenuation length value, and the environmental factors around the water quality can be analyzed.
In the related art, the water attenuation length value can be indirectly obtained based on the ultraviolet-visible spectrophotometer, but the obtained water attenuation length value has low precision.
Disclosure of Invention
In view of the above-mentioned deficiencies or inadequacies in the prior art, it would be desirable to provide a water attenuation length measurement apparatus and method.
The application provides a water decay length measurement device, it includes:
the liquid storage component comprises a liquid storage piece, and a liquid inlet channel and a liquid outlet channel which are connected to the liquid storage piece, the liquid storage piece is vertically arranged, the liquid inlet channel is used for introducing a liquid sample to be detected into the liquid storage piece, and the liquid outlet channel is used for discharging the liquid sample to be detected out of the liquid storage piece;
a light source device provided with a light emitting section;
the photoelectric conversion device is provided with a receiving part, the receiving part of the photoelectric conversion device and the light emitting part of the light source device are arranged oppositely, and the liquid sample to be measured is positioned between the receiving part of the photoelectric conversion device and the light emitting part of the light source device.
When the water attenuation length measuring device of this embodiment is adopted to measure, through inlet channel with the leading-in stock solution spare of liquid sample in, so water attenuation length measuring device can place outside the liquid sample that awaits measuring, can reduce the size that is used for bearing the container of the liquid sample that awaits measuring like this, conveniently carries the container, is convenient for detect the operation.
As a selectable scheme, the device further comprises a control system, wherein the control system controls the flow rates of the liquid inlet channel and the liquid outlet channel so as to adjust the height of the liquid sample to be detected in the liquid storage piece, and the water attenuation length value is obtained according to the height and the electric signal amplitude corresponding to the height at the current moment.
As an optional scheme, the flow rates of the liquid inlet channel and the liquid outlet channel are controlled by an electromagnetic valve, and the height is obtained by a pressure sensor.
As an optional scheme, the liquid storage member is a liquid storage tube, a light barrier is arranged in the liquid storage tube, a light hole is formed in the light barrier, and the light source device, the light hole and the photoelectric conversion device are coaxially arranged, so that light emitted by the light source device is transmitted to the receiving portion of the photoelectric conversion device through the light hole. As an alternative to this, it is possible to,
as an optional scheme, a plurality of light blocking plates are arranged in the liquid storage pipe, and the light blocking plates are arranged at equal intervals.
As optional scheme, still include supporting component, supporting component includes a plurality of support piece, the liquid storage pipe is vertical to be set up, support piece encircles the liquid storage pipe setting, support piece one end support lean on in the liquid storage pipe.
As an optional scheme, the light source device is installed at the upper opening of the liquid storage tube, the photoelectric conversion device is installed at the lower opening of the liquid storage tube, and the liquid inlet channel and the liquid outlet channel are both connected at the lower opening.
Optionally, the light source device is mounted to the upper opening through a first flange member, the light source device is provided with a light source protection cover, and the opening of the light source protection cover is mounted to the first flange member;
the photoelectric conversion device is installed in the lower opening through a second flange part, the photoelectric conversion device is provided with a photoelectric protection cover, an opening of the photoelectric protection cover is installed in the second flange part, a second through hole is formed in the middle of the second flange part, the photoelectric conversion device is installed in the second through hole, and a sealing ring is arranged between the photoelectric conversion device and the second through hole.
The present application also provides a water attenuation length measuring method, which is applied to the water attenuation length measuring device, and includes:
acquiring at least two heights of a liquid sample to be detected in a liquid storage part;
acquiring the amplitude of the electric signal corresponding to the current moment of each height;
establishing a linear mapping curve according to the height and the natural logarithm of the amplitude of the electric signal;
obtaining a water attenuation length value based on the linear mapping curve.
Alternatively, the height difference between two adjacent times is between 15cm and 20 cm.
The water attenuation length measuring method of the embodiment can directly measure the required water attenuation length, and has high measuring precision. And measuring accuracy within 5% is obtained through multi-point testing of different liquid sample heights in the device.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of a water attenuation length measuring device according to an embodiment of the present invention;
fig. 2 is a sectional view a-a of fig. 1.
Fig. 3 is a sectional view B-B of fig. 1.
FIG. 4 is a graph of a linear mapping provided by an embodiment of the present invention;
fig. 5 is a schematic diagram of a positional relationship between the light source device, the photoelectric conversion device, and the liquid storage device according to an embodiment of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
A water attenuation length measuring apparatus according to an embodiment of the present invention will be described with reference to fig. 1 to 3.
As shown in fig. 1, a water attenuation length measuring apparatus according to an embodiment of the present invention includes: a liquid storage unit 30, a light source device 10, and a photoelectric conversion device 20. Stock solution subassembly 30 includes stock solution piece 31 and connects in the inlet channel 32 and the liquid outlet channel 33 of stock solution piece 31, and the vertical setting of stock solution piece 31, inlet channel 32 are used for leading-in the liquid sample that awaits measuring stock solution piece 31, liquid outlet channel 33 are used for the liquid sample that awaits measuring discharge stock solution piece 31.
The light source device 10 is provided with a light emitting section. The photoelectric conversion device 20 is provided with a receiving portion, the receiving portion of the photoelectric conversion device 20 and the light emitting portion of the light source device 10 are arranged to face each other, and the liquid sample to be measured is located between the receiving portion of the photoelectric conversion device 20 and the light emitting portion of the light source device 10.
It should be noted that the liquid storage member 31 may be tubular, and the cross section thereof is not particularly limited. The liquid storage part 31 introduces liquid through the liquid inlet channel 32, and at the moment, the liquid outlet channel 33 is closed, so that the liquid level rises to a first preset height. The liquid storage part 31 discharges liquid through the liquid discharge channel, and at the present moment, the liquid inlet channel 32 is closed, so that the liquid level is reduced to a second preset height. In some embodiments, the liquid inlet is higher than the liquid outlet; in some embodiments, the liquid inlet and the liquid outlet are at the same height.
Here, the connection relationship between the light source device 10 and the photoelectric conversion device 20 and the liquid storage member 31 may be as shown by a solid line in fig. 5, where the light source device 10a is located at the upper opening of the liquid storage member 31 and outside the liquid storage member 31; the photoelectric conversion device 20a is located at the lower opening of the liquid reservoir 31 and outside the liquid reservoir 31. In some embodiments, as shown in phantom in FIG. 5, the light source device 10b is positioned at the upper opening of the reservoir 31 and within the reservoir 31; the photoelectric conversion device 20b is located in the lower opening of the liquid reservoir 31 and within the liquid reservoir 31. In some embodiments, as shown in dashed lines in fig. 5, the light source device 10c and the photoelectric conversion device 20c are both located within the reservoir 31, the light source device 10c is between the upper opening of the reservoir 31 and the middle of the reservoir 31, and the photoelectric conversion device 20c is between the lower opening of the reservoir 31 and the middle of the reservoir 31.
The light source device 10 includes a collimating light cylinder (not shown) and an LED lamp (not shown), wherein a hole is formed in the center of the collimating light cylinder, the aperture of the hole can be adjusted according to the requirement, and the light emitted from the LED lamp is emitted from the hole after being collimated.
The photoelectric conversion device 20 may be a photomultiplier tube (PMT) for collecting light and converting the light into an electrical signal. After the LED lamp in the collimating light cylinder is turned on, the PMT can detect different electric signals under different liquid levels.
When the water attenuation length measuring device of this embodiment is used for measuring, through inlet channel 32 with the leading-in stock solution spare 31 of liquid sample in, so water attenuation length measuring device can place outside the liquid sample that awaits measuring, can reduce the size that is used for bearing the container of the liquid sample that awaits measuring like this, conveniently carries the container, is convenient for detect the operation.
As an implementable manner, the water decay length measuring device further comprises a control system. The control system controls the flow of the liquid inlet channel 32 and the liquid outlet channel 33 to adjust the height of the liquid sample to be measured in the liquid storage part 31, and the water attenuation length value is obtained according to the height and the corresponding electrical signal amplitude of the current time of the height. By the arrangement, the liquid sample height in the liquid storage part 31 can be automatically controlled, and the automation degree of detection operation is improved. The control system also controls the operation of the photoelectric conversion device and collects information.
Specifically, an electromagnetic valve and a pump body are arranged on the liquid inlet channel 32, the pump body is used for driving a liquid sample to enter the liquid storage part 31, and the electromagnetic valve controls the opening and closing of the liquid inlet channel 32; an electromagnetic valve and a pressure sensor are arranged on the liquid outlet channel 33, the electromagnetic valve controls the opening and closing of the liquid outlet channel 33, and the liquid level height in the liquid storage part 31 is obtained through signals of the pressure sensor. The response time of the electromagnetic valve can be as short as several milliseconds, and the electromagnetic valve is more sensitive to reaction than other control valves, so that the liquid sample height in the liquid storage part 31 can be ensured.
In an implementation manner, the liquid storage member 31 is a liquid storage tube, a light barrier 34 is disposed in the liquid storage tube, the light barrier 34 is provided with a light hole 341, and the light source device 10, the light hole 341 and the photoelectric conversion device 20 are coaxially disposed, so that the light emitted from the light source device 10 passes through the light hole 341 to the receiving portion of the photoelectric conversion device 20. By the arrangement, the LED light can be adjusted to be parallel in collimation as much as possible, and impurities and scattered light can be absorbed.
In a particular embodiment, the reservoir tube is vertically disposed as shown in fig. 1. A plurality of light blocking plates 34 are provided in the liquid storage pipe, and the plurality of light blocking plates 34 are arranged at equal intervals from top to bottom. The distance herein is not particularly limited and may be adjusted as needed. By the arrangement, the LED light is further adjusted and collimated to be parallel, and impurities and scattered light are absorbed.
Further, the water attenuation length measuring apparatus further includes a support assembly 40. The support assembly 40 includes a plurality of support members 42, the vertical setting of liquid storage pipe, support member 42 encircle the liquid storage pipe setting, and support member 42 one end is supported and is leaned on in the liquid storage pipe.
As shown in fig. 1, the supporting assembly 40 includes a collar 41 and a supporting member 42, the collar 41 is sleeved on the reservoir pipe, and one end of the rod member is hinged on the collar 41. The support member 42 is a rod member that is disposed obliquely with respect to the reservoir. A plurality of member spares angularly encircles in the liquid storage pipe, and the one end of member is supported by lantern ring 41 and is leaned on the middle part of liquid storage pipe, and the member other end supports and leans on in ground. The liquid storage pipe is supported from the circumferential direction of the liquid storage pipe, and the liquid storage pipe is prevented from toppling. It should be noted that, the end of the rod member abutting against the ground is provided with the leveling anchor bolt, as shown in fig. 1, the vertical height from the end of the rod member abutting against the ground to the ground can be adjusted through the leveling anchor bolt, so that the liquid storage pipe is kept vertical, and the influence on the vertical degree of the liquid storage pipe after the support member 42 is installed is avoided.
Further, the light source device 10 is installed on the upper opening of the liquid storage tube and is located outside the liquid storage tube. The photoelectric conversion device 20 is installed at the lower opening of the liquid storage tube and is located outside the liquid storage tube. The liquid inlet channel 32 and the liquid outlet channel 33 are both connected to the lower opening.
It should be noted that, the light source device 10 and the photoelectric conversion device 20 are located outside the liquid storage tube, which can increase the storage capacity of the liquid storage tube for storing the liquid sample, thereby facilitating multiple tests in the later period and obtaining the height value and the electrical signal amplitude corresponding to the height value. The liquid inlet channel 32 and the liquid outlet channel 33 are both connected to the lower opening, the liquid inlet channel 32 is opened, the liquid outlet channel 33 is closed, the highest surface of the liquid sample is always in a horizontal state, the highest surface is prevented from shaking up and down, light rays penetrate through the highest surface of the liquid sample from the horizontal state to enter the liquid sample, and the accuracy of a detection result is facilitated. Similarly, the liquid inlet channel 32 is closed, the liquid outlet channel 33 is opened, the highest surface of the liquid sample is always in a horizontal state, the highest surface is prevented from shaking up and down, light rays penetrate through the horizontal highest surface of the liquid sample to enter the liquid sample, and the accuracy of a detection result is facilitated.
Specifically, the light source device 10 is provided with the light source protection cover 60, and the light source protection cover 60 is opaque, so that the light source device 10 can completely avoid the light environment, and meanwhile, the light source protection cover 60 protects the light source device 10. The light source device 10 is mounted on the upper opening through the first flange 50, the first flange 50 is provided with a first through hole 51, and light from the light source device 10 enters the liquid sample through the first through hole 51. The opening of the light source protecting cover 60 is mounted to the first flange member 50.
The photoelectric conversion device 20 is provided with the photoelectric protection cover 70, and the photoelectric protection cover 70 is opaque, so that the photoelectric conversion device 20 is completely protected from light, and meanwhile, the photoelectric protection cover 70 protects the photoelectric protection device. The photoelectric conversion device 20 is mounted on the lower opening through the second flange 60, the photoelectric conversion device 20 includes a receiving portion and a converting portion, the second through hole 61 is formed in the middle of the second flange 60, the photoelectric conversion device 20 is mounted on the second through hole 61, the receiving portion is located in the liquid storage component 31, and the converting portion is located in the photoelectric protection cover 70. The opening of the photoelectric protection cover 70 is mounted to the second flange member 60. A seal ring 80a is provided between the photoelectric conversion device 20 and the second through hole 61 to prevent a liquid sample from entering the photoelectric protection cover 70. The second flange member 60 is further provided with a first mounting opening 62 for mounting the liquid inlet passage 32, and a sealing ring 80b is provided between the first mounting opening 62 and the liquid inlet passage 32. The second flange member 60 is further provided with a second mounting opening 63 for mounting the liquid outlet channel 33, and a sealing ring 80c is arranged between the second mounting opening 63 and the liquid outlet channel 33.
In an achievable manner, the liquid storage part 31, the liquid inlet channel 32 and the liquid outlet channel 33 are made of stainless steel material. By the arrangement, other substances cannot be separated out to influence the material of the liquid sample.
Based on the water attenuation length measuring device of the embodiment, correspondingly, the water attenuation length measuring method comprises the following steps:
s10, acquiring at least two heights of the liquid sample to be detected in the liquid storage 31, wherein preferably, 6 different heights of the liquid sample to be detected in the liquid storage 31 are acquired;
step S10 includes:
and S11, the control system controls to close the electromagnetic valve corresponding to the liquid outlet channel 33, open the pump body and open the electromagnetic valve corresponding to the liquid inlet channel 32, and extract the liquid sample to a preset height in the liquid storage pipe. Then, the electromagnetic valves corresponding to the pump body and the liquid inlet channel 32 are closed;
s12, the control system controls the light source device 10 and the photoelectric conversion device 20 to be turned on;
and S13, the control system opens the electromagnetic valve corresponding to the liquid outlet channel 33 to start discharging the liquid sample with the preset volume. Then, a first height corresponding to the liquid sample at the current moment is recorded, and a first electric signal acquired by the PMT corresponding to the current moment is acquired.
S14, repeating the step S13, wherein the volume of the liquid sample discharged every time is equal. Recording the second height, and collecting a second electric signal; recording a third height, acquiring a third electrical signal, … …, recording an nth height, acquiring an nth electrical signal, N being a positive integer. The height difference between two adjacent times is between 15cm and 20 cm.
S20, obtaining the electric signal amplitude corresponding to the current time of each height;
s30, establishing a linear mapping curve according to the height and the natural logarithm of the amplitude of the electric signal;
defined in terms of water decay length λ: a ═ A0e-xλ(1)
Figure BDA0003563469330000081
Wherein x is the height of the liquid sample, A is the signal amplitude measured after the attenuation of water, A is0The original signal amplitude is not attenuated by water.
The natural logarithm is obtained on both sides of the formula 1, that is, the natural logarithm ln (a) of the amplitude of the electrical signal received by the PMT and the height x of the liquid sample in the liquid storage member 31 are in a linear relationship, as shown in fig. 4, so as to obtain the value of the attenuation length λ of the liquid sample.
And S40, obtaining a water attenuation length value based on the linear mapping curve.
The water attenuation length measuring method of the embodiment can directly measure the required water attenuation length, and has high measuring precision. And measuring accuracy within 5% is obtained through multi-point testing of different liquid sample heights in the device.
The foregoing description is only exemplary of the preferred embodiments of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (10)

1. A water attenuation length measuring device, comprising:
the liquid storage component comprises a liquid storage piece, and a liquid inlet channel and a liquid outlet channel which are connected to the liquid storage piece, the liquid storage piece is vertically arranged, the liquid inlet channel is used for introducing a liquid sample to be detected into the liquid storage piece, and the liquid outlet channel is used for discharging the liquid sample to be detected out of the liquid storage piece;
a light source device provided with a light emitting section;
the photoelectric conversion device is provided with a receiving part, the receiving part of the photoelectric conversion device and the light emitting part of the light source device are arranged oppositely, and the liquid sample to be measured is positioned between the receiving part of the photoelectric conversion device and the light emitting part of the light source device.
2. The water attenuation length measuring device according to claim 1, further comprising a control system, wherein the control system controls the flow rates of the liquid inlet channel and the liquid outlet channel to adjust the height of the liquid sample to be measured in the liquid storage part, and the water attenuation length value is obtained according to the height and the corresponding electric signal amplitude of the height at the current moment.
3. The water attenuation length measuring device according to claim 2, wherein the flow rates of the liquid inlet channel and the liquid outlet channel are controlled by a solenoid valve, and the height is obtained by a pressure sensor.
4. The water attenuation length measuring device of claim 1, wherein the liquid storage member is a liquid storage tube, a light barrier is disposed in the liquid storage tube, the light barrier is provided with a light hole, and the light source device, the light hole and the photoelectric conversion device are coaxially disposed, so that the light emitted from the light source device passes through the light hole to reach the receiving portion of the photoelectric conversion device.
5. The water attenuation length measuring device of claim 4, wherein a plurality of light barriers are disposed in the liquid storage pipe, and the plurality of light barriers are arranged at equal intervals.
6. The water attenuation length measuring device of claim 4, further comprising a support assembly, wherein the support assembly comprises a plurality of support members, the reservoir is vertically disposed, the support members are disposed around the reservoir, and one end of the support members abuts against the reservoir.
7. The water attenuation length measuring device according to claim 4, wherein the light source device is installed at the upper opening of the liquid storage tube, the photoelectric conversion device is installed at the lower opening of the liquid storage tube, and the liquid inlet channel and the liquid outlet channel are both connected to the lower opening.
8. The water attenuation length measuring device according to claim 7, wherein the light source device is mounted to the upper opening through a first flange member, the light source device being provided with a light source protector, the light source protector opening being mounted to the first flange member;
the photoelectric conversion device is installed in the lower opening through a second flange part, the photoelectric conversion device is provided with a photoelectric protection cover, an opening of the photoelectric protection cover is installed in the second flange part, a second through hole is formed in the middle of the second flange part, the photoelectric conversion device is installed in the second through hole, and a sealing ring is arranged between the photoelectric conversion device and the second through hole.
9. A water-damping length measuring method applied to the water-damping length measuring apparatus according to any one of claims 1 to 8, comprising:
acquiring at least two heights of a liquid sample to be detected in a liquid storage part;
acquiring the amplitude of the electric signal corresponding to the current moment of each height;
establishing a linear mapping curve according to the height and the natural logarithm of the amplitude of the electric signal;
obtaining a water attenuation length value based on the linear mapping curve.
10. The method of claim 9, wherein the height difference between two adjacent water attenuation lengths is between 15cm and 20 cm.
CN202210298075.7A 2022-03-24 2022-03-24 Water attenuation length measuring device and method Pending CN114674756A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210298075.7A CN114674756A (en) 2022-03-24 2022-03-24 Water attenuation length measuring device and method

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Application Number Priority Date Filing Date Title
CN202210298075.7A CN114674756A (en) 2022-03-24 2022-03-24 Water attenuation length measuring device and method

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CN114674756A true CN114674756A (en) 2022-06-28

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