CN116182896B - Calibration system and calibration method for miniature ocean pressure type depth finder - Google Patents
Calibration system and calibration method for miniature ocean pressure type depth finder Download PDFInfo
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- CN116182896B CN116182896B CN202211343917.2A CN202211343917A CN116182896B CN 116182896 B CN116182896 B CN 116182896B CN 202211343917 A CN202211343917 A CN 202211343917A CN 116182896 B CN116182896 B CN 116182896B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C25/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C13/00—Surveying specially adapted to open water, e.g. sea, lake, river or canal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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Abstract
The invention discloses a calibration system and a calibration method of a miniature ocean pressure type depth finder, wherein the calibration system comprises a pressure standard device and a calibration device; the calibrating device comprises a base fixing frame, a connecting pipe, a tee joint, a high-pressure valve, a sealing upper cover, a sealing barrel, a sealing lower cover and an inlet joint. The invention fundamentally solves the problems of water leakage, liquid level difference, temperature abrupt change, difficult stability of a pressure calibration system and dirt of a standard device and a calibrated instrument in the traditional calibration method, ensures the accuracy and safety of the calibration process of the miniature ocean pressure type depth finder, and improves the batch calibration capability of the miniature ocean pressure type depth finder commonly used in marine observation and forecast and disaster prevention and reduction in China.
Description
Technical Field
The invention relates to the technical field of marine measurement, in particular to a calibration system and a calibration method of a miniature marine pressure type depth finder.
Background
A thermal salt Depth gauge (CTD) is the most commonly used marine measuring instrument, and is usually loaded with a salinity (Conductivity) 'concentration, abbreviated as C' sensor, a Temperature 'Temperature, abbreviated as T' sensor, and a Depth/Pressure sensor. In turn, it is usually integrated with more complex marine instrumentation by matching with other multiparameter sensors such as Sound Velocity (SV), dissolved Oxygen (DO), chlorophyll, etc. In summary, marine surveying instruments are typically a combination of the above-described series of sensors, but the most basic quantities generally indispensable are C, T and D. Of course, manufacturers also produce corresponding marine instruments with single T (solo T), single D (solo D), or warm-pressing combination (TD) or warm-salt Combination (CT) as needed.
In general, single D (solo D) or temperature and pressure combined (TD) marine instruments with low measuring ranges often employ plastic shells, which can be used for offshore or shallow sea areas at sea, to monitor the tide rise and fall conditions of sea water, and the measuring range of pressure sensors contained in such instruments is generally 20m-1km water depth. There are of course also instruments using titanium alloy shells that can be deployed to deeper sea areas of 1km-10 km.
"sea water (sea) depth" is one of the most basic scales for measuring various parameters of physical sea, and a marine pressure type depth finder means a series of marine measuring instruments for measuring sea water depth, to which "pressure sensors" (D) are attached. While miniature ocean pressure type depth sounders are generally referred to as ocean measuring instruments of compact design with pressure (depth) measuring function. The most typical example is RBRsolo available from RBR Inc. Canada 3 D、RBRduet 3 T.D，RBRsolo 3 D|tide16, solo D, duret TD series products, and LC-PT400, DCX-22 of Keller in Switzerland, and DCX25pro isopiestic fluviograph products manufactured by Seikovi Co., ltd.
The main characteristics of the existing miniature ocean pressure type depth sounder are as follows:
1) The shape is small and the design is compact.
2) There is no pressure sensor threaded adapter interface.
3) The measuring range is smaller, the common water depth is 20m-1km (0.2 MPa-10 MPa), and the water depth can be 2km (20 MPa) in a small number.
4) Most of the shells are high polymer shells which cannot resist ultrahigh pressure, and the few shells are metal shells which resist ultrahigh pressure.
5) Are all marine measuring instruments which obtain the seawater pressure value through the pressure sensor so as to be converted into the depth value.
6) The absolute value of the maximum allowable error of the pressure sensor is typically 0.05% fs-0.1% fs.
7) The distinction and direct-reading type instruments are mostly self-contained, namely, the instruments are placed in an underwater appointed position after the setting is completed, the record is continuously carried out, and data are automatically stored in the instruments.
The traditional calibration method of the miniature ocean pressure type depth finder (hereinafter referred to as a calibrated instrument) for the pressure sensor-free threaded adapter interface of the national ocean metering station comprises the following steps: firstly, the equipment is set to start recording data; then, the mixture is put into a water tank filled with water on the ground of a constant temperature laboratory and then sealed; the water tank is connected with a 0.005-level piston pressure gauge through a high-pressure oil pipe; the piston reaches the balance position by adding and subtracting weights and adjusting the screw rod to perform calibration experiment operation; after the operation of the boosting and the reducing strokes of the calibration experiment is finished, taking out the calibrated instrument; connecting a calibrated instrument with a computer, and reading pressure indication values, original signal values and the like of the calibrated instrument at each pressure calibration point through software; comprehensively calculating the pressure indication value and the original signal value of the calibrated instrument and the pressure standard value and the atmospheric pressure value of each calibration point; the above process can complete the calibration of such pressure type depth sounders.
The conventional calibration method has the following problems or disadvantages:
first, the problem of water leakage. Most of the calibrated instruments are high polymer shells which cannot resist ultrahigh pressure, and when the high polymer shells are calibrated in a water tank, instantaneous pressure rising and falling operation is carried out, so that gaps are easily formed at sealing positions due to different deformation rates caused by material differences. The water in the pressure tank is forced into the gap of the instrument at high pressure, which can cause short circuits in the instrument and damage to the instrument circuit board.
Second, the problem of liquid level differences. Typically, when calibrating with a piston manometer, there is a certain difference in height between the calibrated instrument pressure sensor position and the reference position of the pressure gauge, resulting in a liquid level difference. In particular, when the calibrated instrument is a low range instrument, the liquid level difference is not negligible. First, since the instrument to be calibrated is placed in the water tank and its attitude under water may be inclined, calculation of the depth of the water measured with a ruler is liable to bring about an error which is difficult to ignore. Secondly, the water in the water tank is not pure water, but an oil-water mixture, the accurate density of which is unknown, and it is also difficult to calculate the liquid level difference caused thereby. Again, the liquid in the line connecting the piston to the pressure tank is sebacate, the density of which is known, but the distance from the piston pressure reference position to the top of the water tank level also gives rise to a negligible error. Finally, an alternative is to use the increased value of the indication of the theoretical pressure increase between the calibrated instrument and the second pressure calibration point in the atmosphere as the reference value for the level difference point, but this method has the disadvantage that if the calibrated instrument is inaccurate, the level difference is also inaccurate.
Third, temperature abrupt change problem. When the calibration is performed by using the traditional method, the indoor air temperature and the temperature of water in the water tank have certain difference. Although this difference can be alleviated or ignored to some extent after a sufficient constant temperature, the rapid evaporation of water when the calibrated instrument is removed from the water tank to obtain the final air pressure causes a sudden change in the temperature of the calibrated instrument, which can lead to a drastic change in the pressure measurement data, which is difficult to ignore for the calibration results.
Fourth, the pressure calibration system is difficult to stabilize. Because most of the calibrated instruments are high polymer shells which are not resistant to ultrahigh pressure, the shells are filled with air cavities of circuit boards and chips. Because the high polymer shell deforms under high pressure, the deformation is more difficult to ignore especially when a plurality of calibrated instruments are simultaneously placed in a tank for batch calibration. Because the traditional calibration method is an ultrahigh-pressure tubule, the compressible space of the whole oil pressure pipeline system is very small, and as a result of the deformation of the outer shell of the calibrated instrument, the piston of the piston pressure gauge is difficult to stabilize at each high-pressure calibration point, and the pressure needs to be manually adjusted for many times. In the boosting process, the piston can continuously descend after reaching the balance position due to obvious compression effect; during depressurization, the piston continues to rise after reaching the equilibrium position due to the expansion of the polymer housing. The resulting insufficient balancing time of the piston requires manual adjustment of the lead screw to allow the piston to again reach equilibrium. This characteristic of the instrument being calibrated presents a great deal of inconvenience to the batch calibration operation, making it unsatisfactory in terms of both calibration efficiency and accuracy.
Fifth, contamination problems with etalons and calibrated instruments. In the traditional calibration method, in the pressure increasing process, the calibrated instrument deforms, so that the piston pressure gauge continuously supplements pressure through a coarse adjusting compression rod or a screw rod, and more oily sebacate enters the pressure tank; in the process of reducing the pressure by the calibration instrument, water in the tank possibly enters the piston pressure gauge in the process of reducing the pressure by the piston, so that the pollution of a standard device system is caused, and the accuracy of the standard device is seriously influenced. In addition, in the process of calibration by the conventional method, the use of an oil-water mixture in the pressure tank is unavoidable, and thus the contamination of the sensor surface of the calibrated instrument is also easily caused.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a calibration system and a calibration method of a miniature ocean pressure type depth finder, which fundamentally solve the problems of water leakage, liquid level difference, temperature mutation, difficult stabilization of the pressure calibration system and dirt of a standard instrument and a calibrated instrument in the traditional calibration method, ensure the accuracy and safety of the calibration process of the miniature ocean pressure type depth finder, and promote the batch calibration capability of the miniature ocean pressure type depth finder commonly used for ocean observation forecast and disaster prevention and reduction in China.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a calibration system of a miniature ocean pressure type depth finder comprises a pressure standard device and a calibration device;
the calibrating device comprises a base fixing frame, a connecting pipe, a tee joint, a high-pressure valve, a sealing upper cover, a sealing barrel, a sealing lower cover and an inlet joint;
a plurality of sealing barrels are fixed on the base fixing frame, and the upper end and the lower end of each sealing barrel are sealed through a detachable sealing upper cover and a detachable sealing lower cover; an inlet channel is arranged in each sealing upper cover and is communicated with the corresponding sealing barrel, and the inlet channel of each sealing upper cover is respectively communicated with the lower end of a high-pressure valve through a connecting pipe; n-1 tee joints are arranged in each N high-pressure valves, and the lower port of each tee joint is connected with the upper end of one high-pressure valve through a connecting pipe; the adjacent three-way pipes are communicated through one side port by using a connecting pipe, the other side port of the three-way pipe positioned at the head end is communicated with the inlet joint by using a connecting pipe, and the other side port of the three-way pipe positioned at the tail end is connected with the upper end of the high-pressure valve positioned at the tail end by using a connecting pipe; the inlet joint is connected with the pressure standard device through a high-pressure gas pipeline;
the pressure standard device adopts a Fulu gram 6270A pressure controller/calibrator as a pressure making and controlling system and comprises a pressure controlling module for regulating pressure output and 5 0.01-level pressure measuring modules; the measuring ranges of the 5 pressure measuring modules are respectively as follows: (0-200) kpa; (0-700) kpa; (0-2000) kpa; (0 to 7000) kpa; (0-20000) kpa;
the inner cavity of the sealing barrel is matched with the size and shape of the calibrated miniature ocean pressure type depth gauge, and the calibrated miniature ocean pressure type depth gauge can be just installed in the sealing barrel.
Further, the sealing upper cover, the high-pressure valve, the tee joint and the inlet joint are detachably connected with the corresponding connecting pipes in a clamping sleeve mode.
Further, each sealing barrel is detachably fixed on the base fixing frame through a sealing barrel fixing clamp.
Further, the sealing upper cover is made of stainless steel and is threaded, and the sealing upper cover is in threaded connection with the upper end of the sealing barrel.
Further, the sealing lower cover is made of stainless steel and is threaded, and the sealing lower cover is in threaded connection with the lower end of the sealing barrel.
Further, the sealing barrel, the connecting pipes and the tee joint are all made of stainless steel.
Further, one surface of the base fixing frame for fixing the sealing barrel is an inclined surface inclined from top to bottom.
Further, the high-pressure valve is made of stainless steel and is resistant to high pressure of 20 MPa.
The invention also provides a calibration method of the miniature ocean pressure type depth finder by using the calibration system, which comprises the following specific processes:
placing a pressure standard device, a calibration device and a calibrated miniature ocean pressure type depth sounder, namely a calibrated instrument, in a constant temperature and humidity chamber at 20+/-1 ℃ for more than 4 hours;
assembling the calibration device and confirming that the seal is good;
opening the sealing lower covers of the sealing barrels with corresponding numbers according to the number of the calibrated instruments, and opening the corresponding high-pressure valves;
setting the time and sampling frequency of the calibrated instrument to start automatic recording by software, so that the calibrated instrument is in a state to be calibrated;
stably placing and running the calibrated instrument in the current constant temperature and humidity chamber for 3-5 min, and recording the pressure indication value in the current air as the indication value of the initial zero point of the calibrated instrument; and simultaneously reading the current air pressure value of the digital pressure gauge, and recording the current air pressure value into an original record form to serve as a standard value of the initial zero point.
The calibrating device is horizontally placed on a workbench close to the pressure standard device, so that the difference between the horizontal height of the sealing barrel and the height of the pressure standard device is not more than 250mm;
placing the calibrated instrument in a to-be-calibrated state in the sealed barrel with the sealed lower cover opened, and then screwing the sealed lower cover;
the inlet fitting of the calibration device is connected to the pressure outlet of the pressure gauge and screwed down.
The key setting parameters of the lifting program for setting the pressure standard device comprise: the standard value should be set as absolute mode; setting 7-8 calibration points in the range of the calibrated instrument, and calibrating forward and backward strokes, wherein the measurement time of each calibration point is set to be more than 120 s; the stability of each calibration point is set to 0.001% fs-0.005% fs of the pressure measurement module; the stabilizing time of each calibration point is set to be 2-5 min;
after the setting is completed, starting a step-up and step-down program, and starting a calibration process;
after the lifting and pressing procedure of the pressure standard device is completed, opening a sealing lower cover of a sealing barrel where the calibrated instrument is positioned;
taking out the calibrated instrument, placing in a constant temperature and humidity room, placing stably and operating for 3-5 min, and recording the current atmospheric pressure again;
the calibrated instrument is in communication connection with the computer, and calibration data recorded by the calibrated instrument in the calibration process are exported to a corresponding calibration folder; the calibration data includes pressure indication data;
comparing the pressure indicating value data of the calibrated instrument with a pressure standard value of the pressure standard device after the air pressure correction, thereby obtaining an indicating value error of the calibrated instrument;
and (5) compiling the related information such as the calibration conditions, the pressure standard value data, the pressure indicating value data, the measurement uncertainty evaluation degree of the calibration result and the like into the certificate, and thus forming the calibration certificate.
The invention has the beneficial effects that:
1. the invention adopts the modes of gas driving and conducting pressure, pressure control by a pressure controller and standard value providing by a digital pressure gauge (standard pressure module), is different from the traditional liquid driving and conducting pressure mode, and solves the problems of water leakage, liquid level difference, temperature abrupt change, difficult stabilization of a pressure calibration system and dirt of a standard device and a calibrated instrument, which are caused by combining a traditional piston pressure gauge with a liquid pressure tank.
2. The calibration system of the invention has small occupied space, short pressure control time and quick balance time. For the cavity of the sealed barrel, if the channel is used, after the calibrated instrument is plugged in, the residual space in the cavity is very little, and only a small amount of gas is squeezed in from the gap; if the channel is not used, the high-pressure valve is closed, and gas does not enter the cavity of the sealed barrel, so that the volume of the calibration system is not influenced, and the risks of difficult balance and large amount of high-pressure gas are not caused. The size and the shape of the inner cavity of the sealing barrel are kept to be matched with the miniature ocean pressure type depth sounder, and the sealing barrel is only slightly larger than the miniature ocean pressure type depth sounder, so that the lifting and pressing speed, the pressure control speed and the stability can be ensured, and the safety risk caused by a large amount of high-pressure gas is avoided.
3. And energy is saved. According to the actual requirement, the standard device and the calibrated instrument in the laboratory can reach equilibrium at the temperature of (20+/-1) ℃ for only 4 hours. However, in order to calibrate the miniature ocean pressure type depth gauge, the conventional piston pressure gauge and liquid pressure tank are used, water is firstly filled in the tank, and in order to balance the water temperature in the tank with a set constant temperature laboratory (20+/-1 ℃), the constant temperature laboratory needs to be started for at least 12 hours to achieve the balance. As such, it would consume 8 hours of laboratory high energy resources.
4. The temperature balance speed is high. The invention adopts the constant-temperature gas in the unified medium chamber as the pressure conduction medium, and the sealing barrel is made of stainless steel, so that the heat conduction speed is high, and the gas temperature in the sealing barrel and the indoor temperature can be balanced within about 2 minutes. Therefore, the change of the ambient temperature in the pressure calibration process is very small and almost negligible for the calibrated instrument in the whole calibration process.
5. The base fixing support in the calibration system is of an inclined design. When the calibration test starts, the calibrated instrument is pushed into the sealing barrel, and the sealing is carried out on the sealing barrel. After the calibration test is finished, the device is slightly inclined after the sealing rear cover is opened, so that the calibrated instrument can slide into the hand, and the operation is convenient.
6. The calibration system adopts a multi-channel structure, and the number of the open channels can be confirmed according to the number of the instruments with the same measuring range calibrated at the same time, so that a plurality of instruments can be calibrated at the same time, only 1 instrument can be calibrated, and only the corresponding high-pressure valve is required to be opened, thereby being very convenient.
Drawings
FIG. 1 is a schematic diagram of a calibrating device according to an embodiment 1 of the present invention;
FIG. 2 is an exploded sectional view of the sealed tub, the sealed upper cover and the sealed lower cover in embodiment 1 of the present invention;
fig. 3 is a schematic cross-sectional view of a base holder according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and it should be noted that, while the present embodiment provides a detailed implementation and a specific operation process on the premise of the present technical solution, the protection scope of the present invention is not limited to the present embodiment.
Example 1
The embodiment provides a calibration system of a miniature ocean pressure type depth finder, which combines a 0.01-level digital pressure gauge with a range covering 20MPa with a gas pressure controller, and can calibrate common miniature ocean pressure type depth finders with maximum allowable error absolute values more than 0.03% FS within 2km of the range in batches.
The calibration system of the miniature ocean pressure type depth sounder comprises:
pressure standard: a Fulu gram 6270A pressure controller/Calibrator (Fluke Calibration 6270A Pressure Controller/Calibrator) was used as the pressure generating and controlling system, with one Pressure Control Module (PCM) for regulating the pressure output and 5 0.01 level Pressure Measuring Modules (PMM). The measuring ranges of the 5 pressure measuring modules are respectively as follows: (0-200) kPa a; (0-700) kPa a; (0-2000) kPa a; (0-7000) kPa a; (0 to 20000) kPa.
Calibration device: the high-pressure gas pipeline is connected with the pressure standard device to form a complete set of pressure measurement calibration system.
As shown in fig. 1, the calibration device comprises a base fixing frame 9, a connecting pipe 2, a tee joint 3, a high-pressure valve 4, a sealing upper cover 5, a sealing barrel 6, a sealing lower cover 7 and an inlet joint 1;
a plurality of sealing barrels 6 are fixed on the base fixing frame 9, and the upper end and the lower end of each sealing barrel 6 are sealed through a detachable sealing upper cover 5 and a detachable sealing lower cover 7; an inlet channel is arranged in each sealing upper cover 5 and is communicated with the corresponding sealing barrel 6, and the inlet channel of each sealing upper cover 5 is respectively communicated with the lower end of one high-pressure valve 4 through a connecting pipe; n-1 tee joints 3 are configured for each N high-pressure valves 4, and the lower port of each tee joint 3 is connected with the upper end of one high-pressure valve 4 through a connecting pipe; the adjacent three-way pipes 3 are communicated through one side port by using a connecting pipe, the other side port of the three-way pipe 3 positioned at the head end is communicated with the inlet joint 1 by using a connecting pipe, and the other side port of the three-way pipe 3 positioned at the tail end is connected with the upper end of the high-pressure valve 4 positioned at the tail end by using a connecting pipe; the inlet joint 1 is connected with a pressure standard device through a high-pressure gas pipeline;
the inner cavity of the sealing barrel is matched with the size and shape of the calibrated miniature ocean pressure type depth gauge, and the calibrated miniature ocean pressure type depth gauge can be just installed in the sealing barrel.
In this embodiment, the sealing upper cover 5, the high-pressure valve 4, the tee joint 3 and the inlet joint 1 are detachably connected with the corresponding connecting pipe 2 in a clamping manner.
In the present embodiment, each of the seal barrels 6 is detachably fixed to the base fixing frame 9 by a seal barrel fixing jig 8.
In this embodiment, the sealing barrel 6 is made of thickened stainless steel.
Specifically, in this embodiment, the sealing upper cover 5 is made of stainless steel, and is threaded, and is screwed with the upper end of the sealing tub 6.
Specifically, in this embodiment, the sealing lower cover 7 is made of stainless steel, is threaded, and is used for sealing the lower end of the sealing barrel after the calibrated miniature ocean pressure depth gauge is placed in the sealing barrel, and is in threaded connection with the lower end of the sealing barrel 6.
In this embodiment, each connecting tube 2 is made of stainless steel.
In this embodiment, the surface of the base fixing frame 9 for fixing the sealing barrel is an inclined surface inclined from top to bottom.
In this embodiment, the high-pressure valve 4 is made of stainless steel and is resistant to high pressure of 20 MPa.
In this embodiment, the tee 3 is made of stainless steel.
Example 2
The embodiment provides a calibration method for a miniature ocean pressure type depth finder by using the calibration system of the embodiment 1, which comprises the following specific steps:
and the pressure standard device, the calibration device and the calibrated miniature ocean pressure type depth sounder, namely the calibrated instrument, are all placed in a constant temperature and humidity chamber at 20+/-1 ℃ to be stable for more than 4 hours.
The calibration device was assembled and confirmed to seal well.
And opening the sealing lower covers of the sealing barrels of the corresponding number according to the number of the calibrated instruments, and opening the corresponding high-pressure valves.
And setting the information such as time, sampling frequency and the like of the calibrated instrument to start automatic recording by software, so that the calibrated instrument is in a state to be calibrated.
Stably placing and running the calibrated instrument in the current constant temperature and humidity chamber for 3-5 min, and recording the pressure indication value in the current air as the indication value of the initial zero point of the calibrated instrument; and simultaneously reading the current air pressure value of the digital pressure gauge, and recording the current air pressure value into an original record form to serve as a standard value of the initial zero point.
The calibrating device is horizontally placed on a workbench close to the pressure standard device, so that the difference between the horizontal height of the sealing barrel and the height of the pressure standard device is not more than 250mm;
the instrument to be calibrated in the state to be calibrated is placed in the above-mentioned sealed tub with the sealed lower cover opened, and then the sealed lower cover is screwed.
The inlet fitting of the calibration device is connected to the pressure outlet of the pressure gauge and screwed down.
The key setting parameters of the lifting program for setting the pressure standard device comprise: the standard value should be set as absolute mode; setting 7-8 calibration points in the range of the calibrated instrument, and calibrating forward and backward strokes, wherein the measurement time of each calibration point is set to be more than 120 s; the stability of each calibration point is set to 0.001% fs-0.005% fs of the pressure measurement module; the stabilizing time of each calibration point is set to be 2-5 min;
after the setting is completed, a step-up and step-down program is started, and a calibration process is started.
And after the lifting and pressing procedure of the pressure standard device is completed, opening a sealing lower cover of a sealing barrel where the calibrated instrument is positioned.
And taking out the calibrated instrument, placing the instrument in a constant temperature and humidity room, placing the instrument stably and operating the instrument for 3-5 min, and recording the current atmospheric pressure again.
And the calibrated instrument is in communication connection with a computer, and calibration data recorded by the calibrated instrument in the calibration process are exported to a corresponding calibration folder. The calibration data includes pressure indication data, pressure raw value data (if any), pressure temperature compensation data (if any), and the like.
And comparing the pressure indicating value data of the calibrated instrument with a pressure standard value of the pressure standard device after the air pressure correction, thereby obtaining an indicating value error of the calibrated instrument. If the calibrated instrument opens a calibration formula, pressure original value data, pressure temperature compensation data and the like, the calibrated instrument can be corrected to generate a new calibration coefficient.
And (5) compiling the related information such as the calibration conditions, the pressure standard value data, the pressure indicating value data, the measurement uncertainty evaluation degree of the calibration result and the like into the certificate, and thus forming the calibration certificate.
Various modifications and variations of the present invention will be apparent to those skilled in the art in light of the foregoing teachings and are intended to be included within the scope of the following claims.
Claims (5)
1. The calibration system of the miniature ocean pressure type depth finder is characterized by comprising a pressure standard device and a calibration device;
the calibrating device comprises a base fixing frame, a connecting pipe, a tee joint, a high-pressure valve, a sealing upper cover, a sealing barrel, a sealing lower cover and an inlet joint;
a plurality of sealing barrels are fixed on the base fixing frame, and the upper end and the lower end of each sealing barrel are sealed through a detachable sealing upper cover and a detachable sealing lower cover; an inlet channel is arranged in each sealing upper cover and is communicated with the corresponding sealing barrel, and the inlet channel of each sealing upper cover is respectively communicated with the lower end of a high-pressure valve through a connecting pipe; n-1 tee joints are arranged in each N high-pressure valves, and the lower port of each tee joint is connected with the upper end of one high-pressure valve through a connecting pipe; the adjacent three-way pipes are communicated through one side port by using a connecting pipe, the other side port of the three-way pipe positioned at the head end is communicated with the inlet joint by using a connecting pipe, and the other side port of the three-way pipe positioned at the tail end is connected with the upper end of the high-pressure valve positioned at the tail end by using a connecting pipe; the inlet joint is connected with the pressure standard device through a high-pressure gas pipeline;
the pressure standard device is used as a pressure making and pressure controlling system and comprises a pressure controlling module for adjusting pressure output and 5 0.01-level pressure measuring modules; the measuring ranges of the 5 pressure measuring modules are respectively as follows: (0-200) kPa (0-700) kPa (0-2000) kPa (0-7000) kPa (0-20000) kPa;
the inner cavity of the sealing barrel is matched with the size and shape of the calibrated miniature ocean pressure type depth gauge, and the calibrated miniature ocean pressure type depth gauge can be just installed in the sealing barrel; the sealing upper cover is made of stainless steel and is threaded, and the sealing upper cover is in threaded connection with the upper end of the sealing barrel; the sealing lower cover is made of stainless steel and is threaded, and the sealing lower cover is in threaded connection with the lower end of the sealing barrel; the sealing barrel, the connecting pipes and the tee joint are all made of stainless steel; the high-pressure valve is made of stainless steel and is resistant to high pressure of 20 MPa.
2. The calibration system of the miniature marine pressure type depth finder according to claim 1, wherein the sealing upper cover, the high-pressure valve, the tee joint and the inlet joint are detachably connected with the corresponding connecting pipes in a clamping manner.
3. The calibration system of a miniature marine pressure depth finder according to claim 1, wherein each sealed tub is detachably fixed to the base mount by a sealed tub fixing jig.
4. The calibration system of claim 1, wherein the surface of the base holder for holding the sealed barrel is a bevel inclined from top to bottom.
5. A method for calibrating a miniature marine pressure depth finder by using the calibration system of any one of claims 1 to 4, comprising the following steps:
placing a pressure standard device, a calibration device and a calibrated miniature ocean pressure type depth sounder, namely a calibrated instrument, in a constant temperature and humidity chamber at 20+/-1 ℃ for more than 4 hours;
assembling the calibration device and confirming that the seal is good;
opening the sealing lower covers of the sealing barrels with corresponding numbers according to the number of the calibrated instruments, and opening the corresponding high-pressure valves;
setting the time and sampling frequency of the calibrated instrument to start automatic recording by software, so that the calibrated instrument is in a state to be calibrated;
stably placing and running the calibrated instrument in the current constant temperature and humidity chamber for 3-5 min, and recording the pressure indication value in the current air as the indication value of the initial zero point of the calibrated instrument; simultaneously reading the current air pressure value of the digital pressure gauge, and recording the current air pressure value into an original record form to serve as a standard value of an initial zero point;
the calibrating device is horizontally placed on a workbench close to the pressure standard device, so that the difference between the horizontal height of the sealing barrel and the height of the pressure standard device is not more than 250mm;
placing the calibrated instrument in a to-be-calibrated state in the sealed barrel with the sealed lower cover opened, and then screwing the sealed lower cover;
connecting and screwing an inlet joint of the calibrating device with a pressure outlet of the pressure standard;
the key setting parameters of the lifting program for setting the pressure standard device comprise: the standard value should be set as absolute mode; setting 7-8 calibration points in the range of the calibrated instrument, and calibrating forward and backward strokes, wherein the measurement time of each calibration point is set to be more than 120 s; the stability of each calibration point is set to 0.001% fs-0.005% fs of the pressure measurement module; the stabilizing time of each calibration point is set to be 2-5 min;
after the setting is completed, starting a step-up and step-down program, and starting a calibration process;
after the lifting and pressing procedure of the pressure standard device is completed, opening a sealing lower cover of a sealing barrel where the calibrated instrument is positioned;
taking out the calibrated instrument, placing in a constant temperature and humidity room, placing stably and operating for 3-5 min, and recording the current atmospheric pressure again;
the calibrated instrument is in communication connection with the computer, and calibration data recorded by the calibrated instrument in the calibration process are exported to a corresponding calibration folder; the calibration data includes pressure indication data;
comparing the pressure indicating value data of the calibrated instrument with a pressure standard value of the pressure standard device after the air pressure correction, thereby obtaining an indicating value error of the calibrated instrument;
and (5) compiling the related information such as the calibration conditions, the pressure standard value data, the pressure indicating value data, the measurement uncertainty evaluation degree of the calibration result and the like into the certificate, and thus forming the calibration certificate.
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