CN111089862A - Standard turbidity calibration device and method for extreme environment - Google Patents
Standard turbidity calibration device and method for extreme environment Download PDFInfo
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Abstract
The invention relates to a standard turbidity calibration device and a calibration method thereof for extreme environments. The calibration device comprises a temperature-resistant and pressure-resistant shell, a frosted metal plate, a light source module, an optical signal transmission module and an optical signal receiving and processing module. The temperature-resistant pressure-resistant shell comprises a cavity, an incident port and an exit port. The light source module comprises a power supply, a voltage stabilizing circuit, a laser controller and a laser. The optical signal transmission module comprises an optical attenuator and a collimator. Laser emitted by the light source module is transmitted to the frosted metal plate in the cavity through the entrance port after passing through the optical signal transmission module, is emitted from the exit port after being scattered by the frosted metal plate, and is received and processed by the optical signal receiving and processing module. The method adopts the frosted metal plate to replace the traditional standard turbidity solution of formalin, calibrates the turbidity measuring device under the conditions of high temperature and high pressure, and has the advantages of easy storage, strong anti-interference performance, strong environmental adaptability, simple operation and the like.
Description
Technical Field
The invention relates to the technical field of particle size measurement, in particular to a standard turbidity calibration device and a calibration method thereof applicable to extreme environments.
Background
Turbidity is an optical effect, and the degree to which light is blocked through a water layer indicates the ability of the water layer to scatter and absorb light. It is not only related to the content of suspended matter, but also to the composition of impurities in the water, the particle size, shape and the reflective properties of its surface. The control of turbidity is an important content of industrial water treatment, is also an important water quality index, and is closely related to the daily life of people.
Turbidity can be measured with a turbidimeter. The turbidimeter emits light through a length of the sample and detects how much light is scattered by particles in the water from a direction 90 to the incident light. This method of measuring scattered light is called scatterometry. The turbidimeter is generally calibrated by using a standard nephelometric solution of formalin, but the standard nephelometric solution of the formalin can be agglomerated under the conditions of high temperature and high pressure, so that the nephelometric measurement cannot be carried out.
The turbidity measurement technology under normal temperature and pressure is mature, but in extreme environments (inside oil fields and deep sea), the turbidity measurement system needs temperature resistance and pressure resistance due to high-temperature and high-pressure external environments, so that the turbidity measurement technology under the extreme environments is continuously researched.
Disclosure of Invention
The invention aims to provide a standard turbidity calibration device and a calibration method thereof for extreme environments, which can overcome the defects in the prior art, can be used for simulating turbidity measurement in a high-temperature and high-pressure environment, can be compared and referred to with the calibration of a formalin standard turbidity solution, and have the characteristics of high integration level, strong environmental adaptability, strong anti-interference capability, simplicity and safety in operation and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a standard turbidity calibration device that can be used to extreme environment, includes temperature resistant withstand voltage casing, sets up the dull polish metal sheet in temperature resistant withstand voltage casing and is located light source module, optical signal transmission module, the optical signal receiving and processing module of temperature resistant withstand voltage casing outside.
The temperature-resistant pressure-resistant shell comprises a cavity and an incident port and an exit port which are sequentially arranged on the front end surface of the cavity; the light source module comprises a power supply, a voltage stabilizing circuit, a laser controller and a laser; the optical signal transmission module comprises an optical attenuator and a collimator.
The output end of the power supply is connected with the input end of the voltage stabilizing circuit, the output end of the voltage stabilizing circuit is connected with the input end of the laser controller, the output end of the laser controller is connected with the input end of the laser, the output end of the laser is connected with the input end of the optical attenuator, and the output end of the optical attenuator is connected with the input end of the collimator.
Laser emitted by the light source module is transmitted to the frosted metal plate in the cavity through the entrance port after passing through the optical signal transmission module, is scattered by the frosted metal plate and then is emitted from the exit port, and is received and processed by the optical signal receiving and processing module.
Further, the cavity comprises a metal layer and a heat insulation layer which are sequentially arranged from outside to inside; the metal layer is made of alloy steel.
Furthermore, the incident port and the emergent port are temperature-resistant and pressure-resistant glass windows.
Furthermore, the optical signal receiving and processing module comprises a photoelectric detector, a signal processing circuit connected with the output end of the photoelectric detector, and a display screen connected with the output end of the signal processing circuit.
Furthermore, the photoelectric detector adopts a single photon counting module produced by PerkinElmer company, and the model of the single photon counting module is SPCM-AQRH-15.
Furthermore, the signal processing circuit adopts a Cyclone IV series chip of ALTERA company, and the model of the chip is EP4CE6F17C 8.
The invention also relates to a calibration method of the standard turbidity calibration device capable of being used in the extreme environment, which comprises the following steps:
(1) and (5) building the standard turbidity calibration device.
(2) Setting the interior of the cavity to be in a normal-temperature normal-pressure environment, placing a sample cell containing a standard turbid solution of formalin at the position where a frosted metal plate is placed in the cavity, transmitting laser emitted by a light source module to an entrance port through an optical signal transmission module, enabling the laser to be incident on the sample cell containing the standard turbid solution of formalin in the cavity from the entrance port, emitting scattered light scattered by the standard turbid solution of formalin through an exit port, receiving and processing the scattered light by an optical signal receiving and processing module, and obtaining the intensity of the scattered light corresponding to the standard turbid solution of formalin under the current turbidity, and writing the corresponding relation between the scattered light intensity and the turbidity into the optical signal receiving and processing module so as to finish the calibration of the turbidity measuring device under the normal temperature and pressure condition.
Through the turbidity measuring device under the normal atmospheric temperature and pressure condition of demarcating, can mark the dull polish metal sheet of different roughness under the normal atmospheric temperature and pressure condition.
(3) The cavity is internally set to be in a normal temperature and normal pressure environment, the frosted metal plates with different roughness are respectively placed into the cavity, laser emitted by the light source module is transmitted to the entrance port through the optical signal transmission module and is incident on the frosted metal plates in the cavity through the entrance port, scattered light scattered by the frosted metal plates is emitted from the exit port and is received and processed by the optical signal receiving and processing module, and the scattered light intensity corresponding to the frosted metal plates with the current roughness is obtained, so that the corresponding relation between the frosted metal plates with different roughness and the scattered light intensity in the normal temperature and normal pressure environment is obtained. Therefore, the frosted metal plates with different roughness can be equivalent to formalin standard solutions with different turbidity values, and the standard solutions are used for calibrating the turbidity measuring device under the conditions of high temperature and high pressure.
(4) The inside of the cavity is set to be in a high-temperature high-pressure environment, frosted metal plates with different roughness equivalent to formalin standard solutions with different turbidity values are respectively placed in the cavity, laser emitted by the light source module is transmitted to the entrance port through the optical signal transmission module, the frosted metal plates in the cavity are incident to the entrance port, scattered light scattered by the frosted metal plates is emitted from the exit port and is received and processed by the optical signal receiving and processing module, the scattered light intensity corresponding to the frosted metal plates under the current equivalent turbidity value is obtained, therefore, the corresponding relation between the turbidity and the scattered light intensity is obtained under the high-temperature high-pressure environment, the corresponding relation between the scattered light intensity and the turbidity is written into the optical signal receiving and processing module, and the calibration of the turbidity measuring device under the high-temperature high-pressure condition is completed.
Further, the laser emitted by the light source module is transmitted to the entrance port through the optical signal transmission module, which specifically includes the following steps: the power supply supplies power to the voltage stabilizing circuit; the voltage stabilizing circuit is used for ensuring that the laser controller stably outputs the required voltage; the laser controller is used for controlling the output power and the temperature of the laser so that the laser can stably output the required laser power; the laser emits a laser signal; the optical attenuator receives a laser signal emitted by the laser, attenuates the laser signal to proper power, and then outputs the laser signal in parallel through the collimator, so that the laser signal enters the cavity from the incident port.
Further, the receiving and processing by the optical signal receiving and processing module specifically includes the following steps: the photoelectric detector receives scattered light scattered by a frosted metal plate or a formalin standard turbidity solution, the intensity of an optical signal is converted into an electric signal to be output, and the signal processing circuit analyzes and calculates the received electric signal.
According to the technical scheme, the method can be used for simulating turbidity measurement in a high-temperature and high-pressure environment, can be compared and referred to the calibration of a standard turbidity solution of formalin, and has the characteristics of high integration level, strong environmental adaptability, strong anti-interference capability, simplicity and safety in operation and the like.
Drawings
FIG. 1 is a schematic structural diagram of a calibration device according to the present invention;
FIG. 2 is a schematic structural diagram of a temperature-resistant and pressure-resistant shell according to the present invention;
FIG. 3 is a schematic block diagram of a light source module according to the present invention;
FIG. 4 is a schematic block diagram of an optical signal transmission module according to the present invention;
FIG. 5 is a schematic structural diagram of a temperature-resistant and pressure-resistant shell and a frosted metal plate according to the present invention;
fig. 6 is a schematic block diagram of an optical signal receiving and processing module according to the present invention.
Wherein:
10. the device comprises a temperature-resistant and pressure-resistant shell, 11, a metal layer, 12, a heat-insulating layer, 20, a light source module, 21, a power supply, 22, a voltage stabilizing circuit, 23, a laser controller, 24, a laser, 30, an optical signal transmission module, 31, an optical attenuator, 32, a collimator, 40, a frosted metal plate, 50, an optical signal receiving and processing module, 51, a photoelectric detector, 52, a signal processing circuit, 53, a display screen, 60, an entrance port, 70 and an exit port.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
fig. 1 shows a standard turbidity calibration device for extreme environments, which includes a temperature-resistant and pressure-resistant casing 10, a frosted metal plate 40 disposed in the temperature-resistant and pressure-resistant casing 10, and a light source module 20, an optical signal transmission module 30, and an optical signal receiving and processing module 50 located outside the temperature-resistant and pressure-resistant casing 10. The frosted metal plate 40 is a metal plate with a certain roughness, and the scattering intensity of incident light is changed by controlling the roughness of the surface of the frosted metal plate in the production and processing process of the metal plate. The temperature-resistant pressure-resistant shell 10 is used for placing the frosted metal plate 40 inside, the cavity of the shell is in a high-temperature high-pressure environment, and the outer side of the shell is not in the high-temperature high-pressure environment. The method is suitable for turbidity measurement in a high-temperature and high-pressure environment, and has the characteristics of simple operation, wide applicability and the like. Adopt dull polish metal sheet to mark turbidity measuring device under the high temperature high pressure environment, convenient to use stores easily, need not dispose standard turbidity solution repeatedly, and stability is higher.
As shown in fig. 2, the temperature-resistant and pressure-resistant housing 10 includes a cavity, and an entrance port 60 and an exit port 70 sequentially disposed on a front end surface of the cavity. The incident port 60 and the exit port 70 are temperature-resistant and pressure-resistant glass windows. The incident port 60 and the exit port 70 are made of temperature-resistant and pressure-resistant glass materials, so that the whole device can be ensured to normally operate under extreme conditions of high temperature and high pressure.
As shown in fig. 3, the light source module 20 includes a power supply 21, a voltage regulator circuit 22, a laser controller 23, and a laser 24. The output end of the power supply 21 is connected with the input end of the voltage stabilizing circuit, the output end of the voltage stabilizing circuit 22 is connected with the input end of the laser controller 23, and the output end of the laser controller 23 is connected with the input end of the laser 24. The input end of the power supply 21 is connected with the commercial power, and the output end of the power supply provides stable voltage for the laser controller 23. And a laser controller 23 for controlling the power of the laser light output from the laser 24 and the voltage and temperature of the entire light source module. The laser controller 23 can control the power of the laser well, and provide a stable light source for the experiment.
As shown in fig. 4, the optical signal transmission module 30 includes an optical attenuator 31 and a collimator 32. The optical attenuator 31 receives the optical signal output from the laser 24, attenuates the optical signal to a suitable power, and outputs the optical signal in parallel through the collimator 32. The input end of the optical attenuator 31 is connected with the output end of the laser 24, and the output end of the optical attenuator 31 is connected with the input end of the collimator. The output end of the optical attenuator 31 faces the collimator 32, and the collimator 32 can make the incident light exit in parallel.
The laser emitted from the light source module 20 is incident on the frosted metal plate 40 in the cavity through the incident port 60 after passing through the optical signal transmission module 30, is emitted from the exit port 70 after being scattered by the frosted metal plate 40, and is received and processed by the optical signal receiving and processing module. The collimator 32 emits incident light toward the frosted metal plate 40, the surface of the frosted metal plate 40 scatters the incident light, and the photodetector 51 receives the scattered light scattered from the surface of the frosted metal plate 40 from the side, and the angle between the incident light and the scattered light is 90 degrees. The position of the photoelectric detector 51 is fixed on one side of the frosted metal plate 40, and the photoelectric detector 51 converts the detected optical signal into the number of photons and outputs a group of pulse sequences distributed randomly.
As shown in fig. 5, the cavity includes a metal layer 11 and a thermal insulation layer 12 arranged in sequence from outside to inside; the metal layer 11 is made of alloy steel. When the calibration device works, the inner part of the cavity is in a high-temperature and high-pressure environment, the metal layer 11 is made of alloy steel and serves as the outer layer of the cavity, and the normal operation of the whole device under the extreme conditions of high temperature and high pressure can be guaranteed. The heat insulating layer 12 made of heat insulating material is used as the inner layer of the cavity, so that the temperature inside the cavity of the whole device can be reduced.
As shown in fig. 6, the optical signal receiving and processing module 50 includes a photodetector 51, a signal processing circuit 52 connected to an output terminal of the photodetector 51, and a display 53 connected to an output terminal of the signal processing circuit 52. The photodetector 51 is configured to receive scattered light from the frosted metal plate 40, convert the intensity of the received light signal into an electrical signal, and output the electrical signal to the signal processing circuit 52. The signal processing circuit 52 is configured to perform inverse calculation on the received electrical signal to obtain a corresponding turbidity value, and display the turbidity value on the display 53. The photoelectric detector 51 has the advantages of high precision and quick response, and is suitable for quick measurement. The signal processing circuit 52 uses an FPGA chip to perform data processing, and has the advantages of high precision, high accuracy, easy operation, and the like.
Further, the photodetector 51 is a single photon counting module manufactured by PerkinElmer company, and the model of the single photon counting module is SPCM-AQRH-15. Single photons in the wavelength range of 400 nm to 1060 nm can be detected.
Further, the signal processing circuit 52 adopts a Cyclone IV series chip of ALTERA corporation, and the model of the chip is EP4CE6F17C 8. The high-precision analog-to-digital conversion module integrated with the chip is connected with the output end of the photoelectric detector through a BNC interface, converts and calculates the received photon pulse signal, and can calculate the corresponding light intensity. And calculating the corresponding turbidity value by combining the calculated intensity of the scattered light with a 90-degree Mie scattering theory.
The invention also relates to a calibration method of the standard turbidity calibration device capable of being used in the extreme environment, which comprises the following steps:
(1) and (5) building the standard turbidity calibration device.
(2) Setting the interior of the cavity to be in a normal-temperature normal-pressure environment, placing a sample cell containing a standard turbid solution of formalin at the position where a frosted metal plate is placed in the cavity, transmitting laser emitted by a light source module to an entrance port through an optical signal transmission module, enabling the laser to be incident on the sample cell containing the standard turbid solution of formalin in the cavity from the entrance port, emitting scattered light scattered by the standard turbid solution of formalin through an exit port, receiving and processing the scattered light by an optical signal receiving and processing module, and obtaining the intensity of the scattered light corresponding to the standard turbid solution of formalin under the current turbidity, therefore, the corresponding relation between the turbidity of the formalin standard solution in different turbidity ranges and the scattered light intensity is obtained under the normal temperature and normal pressure environment, the corresponding relation between the scattered light intensity and the turbidity is written into the optical signal receiving and processing module, and the turbidity measuring device under the normal temperature and normal pressure condition can be calibrated.
Through the turbidity measuring device under the normal atmospheric temperature and pressure condition of demarcating, can mark the dull polish metal sheet of different roughness under the normal atmospheric temperature and pressure condition.
(3) The cavity is internally set to be in a normal temperature and normal pressure environment, the frosted metal plates with different roughness are respectively placed into the cavity, laser emitted by the light source module is transmitted to the entrance port through the optical signal transmission module and is incident on the frosted metal plates in the cavity through the entrance port, scattered light scattered by the frosted metal plates is emitted from the exit port and is received and processed by the optical signal receiving and processing module, and the scattered light intensity corresponding to the frosted metal plates with the current roughness is obtained, so that the corresponding relation between the frosted metal plates with different roughness and the scattered light intensity in the normal temperature and normal pressure environment is obtained. Therefore, the frosted metal plates with different roughness can be equivalent to formalin standard solutions with different turbidity values, and the standard solutions are used for calibrating the turbidity measuring device under the conditions of high temperature and high pressure.
(4) The inside of the cavity is set to be in a high-temperature high-pressure environment, frosted metal plates with different roughness equivalent to formalin standard solutions with different turbidity values are respectively placed in the cavity, laser emitted by the light source module is transmitted to the entrance port through the optical signal transmission module and is incident on the frosted metal plates in the cavity through the entrance port, scattered light scattered by the frosted metal plates is emitted from the exit port and is received and processed by the optical signal receiving and processing module, the scattered light intensity corresponding to the frosted metal plates under the current equivalent turbidity value is obtained, therefore, the corresponding relation between the turbidity and the scattered light intensity is obtained under the high-temperature high-pressure environment, the corresponding relation between the scattered light intensity and the turbidity is written into the optical signal receiving and processing module, and the turbidity measuring device under the high-temperature high-pressure condition can be calibrated.
Further, the laser emitted by the light source module is transmitted to the entrance port through the optical signal transmission module, which specifically includes the following steps: the power supply supplies power to the voltage stabilizing circuit; the voltage stabilizing circuit is used for ensuring that the laser controller stably outputs the required voltage; the laser controller is used for controlling the output power and the temperature of the laser so that the laser can stably output the required laser power; the laser emits a laser signal; the optical attenuator receives a laser signal emitted by the laser, attenuates the laser signal to proper power, and then outputs the laser signal in parallel through the collimator, so that the laser signal enters the cavity from the incident port.
Further, the receiving and processing by the optical signal receiving and processing module specifically includes the following steps: the photoelectric detector receives scattered light scattered by a frosted metal plate or a formalin standard turbidity solution, the intensity of an optical signal is converted into an electric signal to be output, and the signal processing circuit analyzes and calculates the received electric signal.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (9)
1. A standard turbidity calibration device capable of being used in extreme environments is characterized in that: the standard turbidity calibration device comprises a temperature-resistant and pressure-resistant shell, a frosted metal plate arranged in the temperature-resistant and pressure-resistant shell, and a light source module, an optical signal transmission module and an optical signal receiving and processing module which are positioned outside the temperature-resistant and pressure-resistant shell;
the temperature-resistant pressure-resistant shell comprises a cavity and an incident port and an exit port which are sequentially arranged on the front end surface of the cavity; the light source module comprises a power supply, a voltage stabilizing circuit, a laser controller and a laser; the optical signal transmission module comprises an optical attenuator and a collimator;
the output end of the power supply is connected with the input end of the voltage stabilizing circuit, the output end of the voltage stabilizing circuit is connected with the input end of the laser controller, the output end of the laser controller is connected with the input end of the laser, the output end of the laser is connected with the input end of the optical attenuator, and the output end of the optical attenuator is connected with the input end of the collimator;
laser emitted by the light source module is transmitted to the frosted metal plate in the cavity through the entrance port after passing through the optical signal transmission module, is scattered by the frosted metal plate and then is emitted from the exit port, and is received and processed by the optical signal receiving and processing module.
2. The standard turbidity calibration device for extreme environments as claimed in claim 1, wherein: the cavity comprises a metal layer and a heat insulation layer which are sequentially arranged from outside to inside; the metal layer is made of alloy steel.
3. The standard turbidity calibration device for extreme environments as claimed in claim 1, wherein: the incident port and the emergent port are temperature-resistant pressure-resistant glass windows.
4. The standard turbidity calibration device for extreme environments as claimed in claim 1, wherein: the optical signal receiving and processing module comprises a photoelectric detector, a signal processing circuit connected with the output end of the photoelectric detector and a display screen connected with the output end of the signal processing circuit.
5. The standard turbidity calibration device for extreme environments as claimed in claim 1, wherein: the photoelectric detector adopts a single photon counting module produced by PerkinElmer company, and the model of the single photon counting module is SPCM-AQRH-15.
6. The standard turbidity calibration device for extreme environments as claimed in claim 1, wherein: the signal processing circuit adopts a Cyclone IV series chip of ALTERA company, and the model of the chip is EP4CE6F17C 8.
7. The calibration method of the standard turbidity calibration device according to any one of claims 1 to 6, wherein: the method comprises the following steps:
(1) building the standard turbidity calibration device;
(2) setting the interior of the cavity to be in a normal-temperature normal-pressure environment, placing a sample cell containing a standard turbid solution of formalin at the position where a frosted metal plate is placed in the cavity, transmitting laser emitted by a light source module to an entrance port through an optical signal transmission module, enabling the laser to be incident on the sample cell containing the standard turbid solution of formalin in the cavity from the entrance port, emitting scattered light scattered by the standard turbid solution of formalin through an exit port, receiving and processing the scattered light by an optical signal receiving and processing module, and obtaining the intensity of the scattered light corresponding to the standard turbid solution of formalin under the current turbidity, obtaining the corresponding relation between the turbidity and the scattered light intensity of the formalin standard solution with different turbidity ranges in the normal-temperature normal-pressure environment, and writing the corresponding relation between the scattered light intensity and the turbidity into the optical signal receiving and processing module so as to finish the calibration of the turbidity measuring device under the normal-temperature normal-pressure condition; the calibrated turbidity measuring device under the normal temperature and pressure condition can calibrate the frosted metal plates with different roughness under the normal temperature and pressure condition;
(3) setting the interior of a cavity to be in a normal-temperature normal-pressure environment, respectively placing frosted metal plates with different roughness into the cavity, transmitting laser emitted by a light source module to an entrance port through an optical signal transmission module, enabling the laser to be incident on the frosted metal plates in the cavity from the entrance port, emitting scattered light scattered by the frosted metal plates through an exit port, receiving and processing the scattered light by an optical signal receiving and processing module, and obtaining the intensity of the scattered light corresponding to the frosted metal plates with the current roughness, so that the corresponding relation between the frosted metal plates with different roughness and the intensity of the scattered light is obtained under the normal-temperature normal-pressure environment, and the frosted metal plates with different roughness can be equivalent to formalin standard solutions with different turbidity values for calibrating a turbidity measuring device under the high-temperature high-pressure condition;
(4) the inside of the cavity is set to be in a high-temperature high-pressure environment, frosted metal plates with different roughness equivalent to formalin standard solutions with different turbidity values are respectively placed in the cavity, laser emitted by the light source module is transmitted to the entrance port through the optical signal transmission module, the frosted metal plates in the cavity are incident to the entrance port, scattered light scattered by the frosted metal plates is emitted from the exit port and is received and processed by the optical signal receiving and processing module, the scattered light intensity corresponding to the frosted metal plates under the current equivalent turbidity value is obtained, therefore, the corresponding relation between the turbidity and the scattered light intensity is obtained under the high-temperature high-pressure environment, the corresponding relation between the scattered light intensity and the turbidity is written into the optical signal receiving and processing module, and the calibration of the turbidity measuring device under the high-temperature high-pressure condition is completed.
8. The calibration method of the standard turbidity calibration device according to claim 7, wherein: the laser emitted by the light source module is transmitted to the entrance port through the optical signal transmission module, and the method specifically comprises the following steps: the power supply supplies power to the voltage stabilizing circuit; the voltage stabilizing circuit is used for ensuring that the laser controller stably outputs the required voltage; the laser controller is used for controlling the output power and the temperature of the laser so that the laser can stably output the required laser power; the laser emits a laser signal; the optical attenuator receives a laser signal emitted by the laser, attenuates the laser signal to proper power, and then outputs the laser signal in parallel through the collimator, so that the laser signal enters the cavity from the incident port.
9. The calibration method of the standard turbidity calibration device according to claim 7, wherein: the receiving processing by the optical signal receiving processing module specifically comprises the following steps:
the photoelectric detector receives scattered light scattered by a frosted metal plate or a formalin standard turbidity solution, the intensity of an optical signal is converted into an electric signal to be output, and the signal processing circuit analyzes and calculates the received electric signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911408612.3A CN111089862B (en) | 2019-12-31 | Standard turbidity calibration device and calibration method for extreme environment |
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| CN201911408612.3A CN111089862B (en) | 2019-12-31 | Standard turbidity calibration device and calibration method for extreme environment |
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| CN111089862A true CN111089862A (en) | 2020-05-01 |
| CN111089862B CN111089862B (en) | 2024-06-04 |
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