CN115979297A - Large and medium-sized ocean pressure type depth finder calibration system and calibration method - Google Patents
Large and medium-sized ocean pressure type depth finder calibration system and calibration method Download PDFInfo
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Abstract
The invention discloses a large and medium ocean pressure type depth finder calibration system and a calibration method, wherein the calibration system comprises a pressure standard and a calibration device; calibrating device includes external thread joint, filter, transfer post, left turn takeover, platform, left turn post, left passageway bypass subassembly, right turn post, well passageway bypass subassembly, right turn takeover and pressure adaptor. The method solves the problems of long working time and serious labor consumption of the traditional calibration method, and can greatly improve the calibration efficiency of the pressure sensor of the large and medium-sized marine pressure type depth sounder.
Description
Technical Field
The invention relates to the technical field of ocean surveying, in particular to a large and medium ocean pressure type depth sounder calibrating system and a calibrating method.
Background
Thermohaline Depth (CTD) is the most commonly used marine measurement instrument, and usually carries at least a "salinity (Conductivity)" Conductivity, abbreviated as C "sensor, a" Temperature, abbreviated as T "sensor, and a" Depth (Pressure) "Depth/Pressure, abbreviated as D" sensor. Other various sensors for Sound Velocity (SV), dissolved Oxygen (DO), turbidity, chlorophyll, etc. are also typically selected for integration into more complex marine measurement instruments. In summary, usually the oceanographic measurement instrument is a combination of the series of sensors described above, but the most basic quantities that are generally indispensable are C, T and D. Of course, the manufacturer also composes the product in the form of single T (soloT), single D (soloD), or combination of warm and pressure (TD) or combination of warm salts (CT) as desired.
The ocean can typically be divided into 5 water layers in depth: the marine deep layer comprises an upper marine layer (more than 200 m), a middle marine layer (200 m-1 km), a deep marine layer (1 km-4 km), a deep marine layer (4 km-6 km) and a super deep marine layer (less than 6 km). The depth of 90% of the ocean in the world's oceans will not exceed 6km.
In general: the CTD with medium-low measuring range is mainly used for near shore, shallow sea, upper ocean layer and middle ocean layer, the measuring range of the pressure sensor is generally 20-1 km water depth, and the few CTDs with medium-low measuring range can achieve 2km water depth. Such instruments are factory calibrated in pressure tanks at relatively low to medium pressures and are therefore not generally threaded for high pressure calibration.
In contrast, CTDs deployed in deep ocean layers, deep-brillouin layers, range up to or over 6km in depth. Therefore, when the high-pressure standard is calibrated in the factory, internal threads are required to be formed at the pressure outlet so as to facilitate the connection calibration of the high-pressure standard and the high-pressure standard.
The sea water (sea) depth is a basic ruler for measuring various physical sea parameters, and the sea pressure type depth sounder is a series of sea measuring instruments which are provided with pressure sensors (D) and can be used for measuring the sea water depth. The large and medium ocean pressure type depth sounder is generally provided with temperature, salinity and depth sensors (at least comprising pressure sensors) and pressure sensor threaded interfaces, and is mainly used for ocean instruments for measuring ocean parameters of deep ocean layers and deep Brillouin layers.
The existing large and medium ocean pressure type depth sounder is mainly characterized in that:
1. the morphology is large or medium.
2. The outlet of the pressure sensor is an internal thread adapter interface.
3. The measuring range is large, and is usually 1km-6km, and is mainly 4km-6 km.
4. Most are metal housings resistant to ultra-high pressure.
5. Thereby be the marine measuring instrument who obtains the sea water pressure value through pressure sensor and convert into the depth value.
6. The absolute value of the maximum allowable error of the pressure sensor is usually 0.015% FS-0.3% FS, and 0.1% FS, 0.05% FS.
7. Generally, the device is a direct-reading instrument or has the function of directly reading measured data after being connected with a data line, and can continuously record.
The current common calibration method for the large and medium marine pressure depth sounder (hereinafter referred to as calibrated instrument) with the pressure sensor internal thread adapter interface is as follows: the etalon and the instrument to be calibrated are placed in a (20 + -1) ° c incubator so that the temperature of the equipment is equilibrated. The calibrated instrument is placed on a lifting platform, so that the position of a pressure interface of the instrument is as high as the reference line of the piston type pressure gauge. The indoor atmospheric pressure value is recorded. And opening the recording software of the calibrated instrument, and recording the pressure indication value and the pressure original value (if any) of the calibrated instrument in the current atmospheric pressure, wherein the pressure indication value and the pressure original value are the initial zero point. A thin high-pressure resistant pipe is led out from the pressure testing port of the piston type pressure gauge, and the terminal of the high-pressure pipe is externally connected with a movable internal thread port. And connecting the internal thread interface of the pressure standard device with the external thread interface at one end of the pressure adapter. And the other end of the pressure adapter is connected with an internal thread pressure interface of the detected instrument.
The pressure is increased and decreased by adding and subtracting weights by using a piston type pressure gauge, 6-7 stable standard pressure balance points are manufactured and recorded in the measuring range of the calibrated instrument, and the pressure indication value and the pressure original value (if any) of the calibrated instrument are recorded by a computer. And after the pressure reduction is finished, disconnecting the calibrated instrument from the standard. The pressure indication, the pressure original (if any), of the calibrated instrument continues to be continuously recorded, this being the end zero. I.e., including the initial and final zero points, the ramping process creates a total of 13-15 pressure calibration points. And finally, comprehensively calculating the pressure indicating value and the original value of the calibrated instrument, the pressure standard value and the atmospheric pressure value of each calibration point, and completing the calibration of the pressure type depth finder.
The existing calibration method mainly has the following problems:
1. the working time is long. The conventional method calibrates 1 instrument at a time, each calibration point requiring the system to stabilize for about 3min. The working time of the calibration test of each instrument is about 1h by calculating the time of front-back connection, debugging and the like. And processing the data at the later stage, cleaning and preprocessing the data according to the condition of manual operation calibration at that time, and arranging the data into standardized data capable of issuing certificates, wherein the time is about 1h. I.e. at least 2h is needed for 1 instrument pressure sensor calibration. It is common that about 30 labs are tested simultaneously in a laboratory, and the large and medium marine pressure type depth sounders have the same measuring range although the models may be different. If the operation is performed in a conventional manner, the entire operation time is 60h. Calculated on an 8 hour working day, this can only be accomplished in about 7.5 days.
2. The labor cost is serious. As mentioned above, a general pressure laboratory may simultaneously test 30 large and medium-sized ocean pressure type depth finders with the same measuring range. If the stainless steel weight needs to be moved once (about 5 kg/time) for each pressure calibration point, 390 times are needed to be moved, about 2 tons of weights are moved, and the physical consumption is very serious. Taking the CTD with 6km measuring range as an example, 5kg of the CTD needs to be moved at least 14 times and 70 kg/station. Calculated as 30 times x 70 kg/time =2100kg, i.e. 2.1 tonnes. The weight is required to be moved 5600 times in the whole test process, and the weight is about 28 tons.
Description of several terms of art:
the pressure adapter is a hollow high-pressure-resistant small adapter with two ends provided with external threads and used for connecting a standard device and a calibrated instrument. The connection end with the standard is defined as the S end, and the connection end with the calibrated instrument is defined as the D end. S stands for Standard and D stands for Device.
The special data line is a cable which connects the data output end of the calibrated instrument with the data port of the computer and is used for transmitting data. According to the type of the calibrated instrument, the connection end of the calibrated instrument can be a 2-core-6-core watertight joint, a type-C, micro-USB and other types; the data port of the computer can be an RS232 type COM port, an RS485 type COM port, a USB type and the like. Generally, the connection end with the instrument to be calibrated is mostly 4-core watertight joints, and the data port with the computer is mostly RS232 type. The special data line with the data port of the computer being an RS232 type COM port generally has two wires for connecting an external direct current power supply, and the common power supply mode is 12V, and is used when the electric quantity of the battery in the calibrated instrument is insufficient.
Potential difference: from the vertical view, a certain height difference often exists between the reference position of the standard device and the pressure sensor of the detected instrument. If the conducting medium in this level difference is a liquid (sebacate or water), its effect is often taken into account. For gaseous media, the effect of such gas column differences is negligible, since the density of the gas is only about 10% -20% under the same conditions at room temperature and a pressure of (10-20) MPa.
Pressure conduction medium: and the medium is used for transmitting the standard pressure value produced by the pressure standard device to the pressure sensor of the detected instrument. The liquid medium is typically sebacate or water; the gaseous medium is typically high purity nitrogen or compressed air.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a large and medium-sized marine pressure type depth finder calibration system and a calibration method, solves the problems of long working time and serious labor consumption of the traditional calibration method, and can greatly improve the calibration efficiency of the pressure sensor of the large and medium-sized marine pressure type depth finder.
In order to achieve the purpose, the invention adopts the following technical scheme:
a large and medium-sized ocean pressure type depth sounder calibration system comprises a pressure standard and a calibration device;
the calibration device comprises an external thread connector, a filter, a transfer column, a left transfer pipe, a platform, a left transfer column, a left channel bypass assembly, a right transfer column, a middle channel bypass assembly, a right transfer pipe and a pressure transfer piece;
the platform is provided with a middle transfer connecting column, a left transfer connecting column and a right transfer connecting column, the middle transfer connecting column and the left transfer connecting column are mutually communicated through a left transfer connecting pipe, and the middle transfer connecting column and the right transfer connecting column are mutually communicated through a right transfer connecting pipe; the middle transfer column is communicated with an outlet of the filter, and an inlet of the filter is communicated with the first external thread joint; the external thread joint is used for connecting a pressure outlet of the pressure standard;
the middle transfer connecting column, the left transfer connecting column and the right transfer connecting column are respectively communicated with the middle channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly; the middle channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly respectively comprise one or more internal thread movable joints, and each internal thread movable joint is provided with a detachable plug for sealing the internal thread movable joint; the internal thread movable joints of the middle channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly are respectively connected with a first connecting pipe with a first valve, a second connecting pipe with a second valve and a third connecting pipe with a third valve, and the first connecting pipe, the second connecting pipe and the third connecting pipe are respectively connected with a middle transfer column, a left transfer column and a right transfer column;
and the internal thread movable joints of the middle channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly are connected with a pressure interface of the calibrated instrument through a pressure adaptor.
Furthermore, the middle channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly can adopt a single channel bypass assembly, a double channel bypass assembly or a three channel bypass assembly; the single-channel bypass assembly only comprises a single internal thread movable joint, and the internal thread movable joint of the single-channel bypass assembly is communicated with the first connecting pipe, the second connecting pipe or the third connecting pipe; the two-channel bypass assembly comprises two internal thread movable joints, the two internal thread movable joints of the two-channel bypass assembly are respectively communicated with two ports of the tee joint, and the rest port of the tee joint is communicated with the first connecting pipe, the second connecting pipe or the third connecting pipe; the three-channel bypass assembly comprises three internal thread movable joints, the three internal thread movable joints of the three-channel bypass assembly are respectively communicated with three ports of a four-way, and the rest port of the four-way is communicated with the first connecting pipe, the second connecting pipe or the third connecting pipe.
Further, the pressure standard employs a piston gauge of grade 0.005 or a digital gauge and pressure controller of grade 0.01.
Further, the platform has four adjustable height feet.
Furthermore, the pipeline connected with the first connecting pipe, the second connecting pipe and the third connecting pipe and the pipeline connected with the first connecting pipe, the second connecting pipe and the third connecting pipe are all elastic clamping sleeves, the outer diameter is 3.17mm, and the wall thickness is 1mm.
Further, the filter adopts a preposed particle filter which is resistant to 60MPa pressure and has a filtering particle size of 7 mu m.
Furthermore, the middle transfer column is of a four-way structure, and the left transfer column and the right transfer column are both of two-way structures.
Furthermore, the left-turn connecting pipe and the right-turn connecting pipe are both metal pipes which can resist 60MPa high pressure, have the outer diameter of 6mm and the wall thickness of 2 mm.
Furthermore, the middle transfer post, the left transfer post and the right transfer post are respectively connected with the middle internal thread movable joint, the left internal thread movable joint and the right internal thread movable joint; the connecting pipe I, the connecting pipe II and the connecting pipe III are respectively connected with an external thread fixed joint I, an external thread fixed joint II and an external thread fixed joint III, and the external thread fixed joint I, the external thread fixed joint II and the external thread fixed joint III are respectively in matched connection with the middle internal thread movable joint, the left internal thread movable joint and the right internal thread movable joint, so that the middle transfer column, the left transfer column and the right transfer column are communicated with the middle channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly.
The invention discloses a method for calibrating a large and medium-sized marine pressure type depth sounder by using the calibration system, which comprises the following specific processes:
determining the number of internal thread movable joints of the middle channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly according to the number of calibrated large and medium ocean pressure type depth finders, namely calibrated instruments;
and (3) preparing for constant temperature, namely placing the pressure standard device, the instrument to be calibrated and the calibration device in a constant temperature chamber with the temperature of (20 +/-1) DEG C for stabilizing for more than 4 h.
Placing the calibrated instrument on a platform and fixing; the laser level is used as horizontal reference auxiliary equipment, the height of the platform is adjusted to enable the reference positions of the calibrated instrument and the pressure standard to be on the same horizontal line as much as possible, and the influence of the potential difference on the calibration result is reduced.
Connecting the data output end of the calibrated instrument to a COM port of a computer through a special data line; the computer obtains the pressure indication value of the calibrated instrument under the current air pressure condition; simultaneously recording the current atmospheric pressure value displayed by a standard barometer in the thermostatic chamber, wherein the current atmospheric pressure value is the standard value of the initial zero point of the pressure;
according to the number of the calibrated instruments, plugging the female threaded movable joints with the corresponding number of the middle channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly, and opening valves corresponding to the middle channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly;
connecting the first external thread joint of the calibration device with the corresponding internal thread joint of the pressure outlet of the pressure standard device to form a multi-channel measurement system; pre-pressing in advance in the pressure standard device, and properly discharging pressure transmission media from each internal thread union of the middle channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly for expelling air bubbles in the calibration device;
connecting a pressure interface of the calibrated instrument with one end of a pressure adapter, and injecting a pressure transmission medium from the other end of the pressure adapter by using an injection needle tube to expel air bubbles in the pressure transmission medium;
connecting the other end of the pressure adaptor connected with the calibrated instrument to internal thread movable joints corresponding to the middle channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly;
starting normal operation of a pressure increasing stroke and a pressure reducing stroke by using a pressure standard device, uniformly creating a plurality of standard pressure reference points in the measuring range of the detected instrument, and recording the magnitude of the standard pressure reference points; during the process, the computer continuously records and obtains the pressure indication value of the calibrated instrument;
after the lifting down stroke is finished, the other end of the pressure adapter of the calibrated instrument is disconnected with the corresponding internal thread movable joint;
the computer keeps recording and obtains the pressure indication value of the calibrated instrument; the pressure indication of the calibration instrument at the tail zero point is recorded;
after the test is finished, closing valves of the middle channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly, and sealing each internal thread union by using plugs;
at the later stage, the pressure indicating value data of the calibrated instrument is compared with the pressure standard value provided by the pressure standard device after air pressure correction, so that the indicating value error of the calibrated instrument is obtained;
and (4) compiling relevant information such as calibration experiment conditions, standard value data, pressure indicating value data, measurement uncertainty of a calibration result and the like into the certificate to form a calibration certificate.
The invention has the beneficial effects that:
1. the invention adopts a structure of selectable multiple channels, one or more channels can be started through the matching of the valve and the plug, the calibration of one or more calibrated instruments is realized simultaneously, and for the channels which are not needed, the valve of the corresponding channel is closed and the corresponding internal thread movable joint is plugged. The method can meet the requirement of variable quantity of calibrated instruments, solves the problem of long working time of the traditional calibration method, and can greatly improve the calibration efficiency of the pressure sensors of large and medium-sized marine pressure type depth finders.
2. The invention adopts the elastic connecting pipe with the outer diameter of 3.17mm and the wall thickness of 1mm as the main pipeline, and the superfine inner diameter of the pipeline can ensure that the liquid storage amount of the calibrating device is extremely small, and can reduce the damping phenomenon in the pressure increasing and reducing process. Because the connecting pipe has elasticity, the effective distance between the internal thread movable joints is adjustable, and the requirements of different distances between the pressure sensors caused by different sizes of calibrated instruments can be met.
3. Compared with the traditional calibration scheme, the calibration method and the calibration device have the advantages that the manual consumption can be greatly reduced on one hand, and the loss of the standard device can be greatly reduced on the other hand.
Drawings
Fig. 1 is a schematic structural diagram of a calibration device in embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of the left channel bypass assembly 9 of FIG. 1;
fig. 3 is a schematic structural view of a pressure adapter in embodiment 1 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 the present embodiment is based on the technical solution, and the detailed implementation and the specific operation process are provided, but the protection scope of the present invention is not limited to the present embodiment.
Example 1
According to the large and medium ocean pressure type depth sounder calibration system provided by the embodiment, the piston type pressure gauge or the digital pressure gauge is used as a stable standard pressure source, and a calibration device is combined, so that the large and medium ocean pressure type depth sounders with various same calibration ranges within 6km can be calibrated in batches (1-6 depth sounders can be calibrated simultaneously according to needs).
Specifically, the large and medium-sized marine pressure type depth finder calibration system comprises a pressure standard and a calibration device;
the pressure standard device adopts a 0.005-grade piston type pressure gauge (such as KY0.6/KY6/KY60 type of Shanghai Min Yu Kogyo Co., ltd.) or a 0.01-grade digital pressure gauge and a pressure controller (such as ConST811A type digital pressure calibrator of Beijing Kang Site instrument science and technology Co., ltd.). The piston type pressure gauge KY0.6/KY6/KY60 is 0.005 grade, has 3 pistons (0.04-0.6) MPa, (0.1-6) MPa and (1-60) MPa), and can be used for a large and medium marine pressure type depth gauge with a calibration range of less than 6km and a maximum allowable error absolute value of more than 0.01 percent FS; the ConsT811A digital pressure calibrator, which is equipped with a 0.01-order digital pressure gauge with three ranges of (0-6) MPa, (0-25) MPa, and (0-60) MPa, and a pressure controller with a pressure control capacity of 0.005-FS, can be used to calibrate a large and medium-sized marine pressure depth sounder with a range of 6km or less and a maximum allowable error of 0.03-FS or more in absolute value.
As shown in fig. 1 to 3, the calibration device includes a first male connector 1, a filter 2, a middle adapter column 3, a left adapter tube (outer diameter 6 mm) 4, a platform 5, a left adapter column 6, a support leg 7, a left female connector union 8, a left channel bypass assembly 9, a right channel bypass assembly 10, a right female connector 11, a right adapter column 12, a middle channel bypass assembly 13, a middle female connector union 14, a right adapter tube (outer diameter 6 mm) 15, and a pressure adapter 16;
the platform is provided with a middle transfer column 3, a left transfer column 6 and a right transfer column 12, the middle transfer column 3 and the left transfer column 6 are mutually communicated through a left transfer connecting pipe 4, and the middle transfer column 3 and the right transfer column 12 are mutually communicated through a right transfer connecting pipe 15; the middle adapter column 3 is communicated with an outlet of the filter 2, and an inlet of the filter 2 is communicated with the first external thread joint 1; the external thread joint I1 is used for connecting a pressure outlet of a pressure standard;
the middle transfer post 3, the left transfer post 6 and the right transfer post 12 are respectively communicated with a middle channel bypass assembly 13, a left channel bypass assembly 9 and a right channel bypass assembly 10; the middle channel bypass assembly 13, the left channel bypass assembly 9 and the right channel bypass assembly 10 respectively comprise internal thread movable joints 18, and each internal thread movable joint 18 is provided with a detachable plug for sealing the internal thread movable joint 18; the middle channel bypass assembly 13, the left channel bypass assembly 9 and the right channel bypass assembly 10 are respectively provided with a first connecting pipe 19 with a first valve 17, a second connecting pipe 25 with a second valve 24 and a third connecting pipe 27 with a third valve 26, and the first connecting pipe 19, the second connecting pipe 25 and the third connecting pipe 27 are respectively connected to the middle transfer column 3, the left transfer column 6 and the right transfer column 12.
The center channel bypass assembly 13, the left channel bypass assembly 9 and the right channel bypass assembly 10 are all optionally single channel bypass assemblies, double channel bypass assemblies or triple channel bypass assemblies. Fig. 1 shows an exemplary case where the center channel bypass module 13 is a single-channel bypass module, the left channel bypass module 9 is a two-channel bypass module, and the right channel bypass module 10 is a three-channel bypass module.
The single-channel bypass assembly only comprises a single internal thread union 18, and the internal thread union 18 of the three-channel bypass assembly is communicated with a connecting pipe I19, a connecting pipe II 25 or a connecting pipe III 27 (the connecting pipe I19 is connected in the embodiment);
the dual-channel bypass assembly comprises two internal thread unions 18, the two internal thread unions 18 of the dual-channel bypass assembly are respectively communicated with two ports of a tee 20, and the rest port of the tee 20 is communicated with a connecting pipe I19, a connecting pipe II 25 or a connecting pipe III 27 (the connecting pipe II 25 is connected in the embodiment);
the three-channel bypass assembly comprises three internal thread movable joints 18, the three internal thread movable joints 18 of the three-channel bypass assembly are respectively communicated with three ports of a four-way 101, and the rest port of the four-way 101 is communicated with a connecting pipe I19, a connecting pipe II 25 or a connecting pipe III 27 (the connecting pipe III 27 is connected in the embodiment).
The female threaded unions 18 of the center channel bypass assembly 13, the left channel bypass assembly 9 and the right channel bypass assembly 10 are connected to the pressure interface of the calibrated instrument through the pressure adaptor 16.
In the present embodiment, the platform 5 has four height-adjustable feet 7.
In this embodiment, the size of the first male connector 1 corresponds to M20 × 1.5. Female threaded union 18 is used with dimensions M20 x 1.5.
In this embodiment, each female union 18 connects the first connecting pipe, the third connecting pipe 20 or the four-way pipe 101, and the first connecting pipe 19, the second connecting pipe 25 and the third connecting pipe 27 all adopt elastic clamping sleeves (the outer diameter is 3.17mm, and the wall thickness is 1 mm).
In this example, the filter 2 used was a pre-particulate filter having a filter particle diameter of 7 μm and withstanding a pressure of 60 MPa.
In this embodiment, the middle transfer column 3 has a four-way structure, and the left transfer column 6 and the right transfer column 12 both have a two-way structure.
In the present embodiment, a high pressure resistant metal pipe (6 mm in outer diameter and 2mm in wall thickness) is used for each of the left-hand adapter 4 and the right-hand adapter 15.
In this embodiment, the middle adapter 3, the left adapter 6 and the right adapter 12 are respectively connected with the middle female union 14, the left female union 8 and the right female union 11;
the first connecting pipe 19, the second connecting pipe 25 and the third connecting pipe 27 are respectively connected with a first external thread fixed joint 21, a second external thread fixed joint 22 and a third external thread fixed joint 23, the first external thread fixed joint 21, the second external thread fixed joint 22 and the third external thread fixed joint 23 are respectively connected with the middle internal thread movable joint 14, the left internal thread movable joint 8 and the right internal thread movable joint 11 in a matching manner, and therefore the communication of the middle transfer column 3, the left transfer column 6 and the right transfer column 12 with the middle channel bypass assembly 13, the left channel bypass assembly 9 and the right channel bypass assembly 10 is achieved.
Specifically, the middle internal thread union 14, the left internal thread union 8 and the right internal thread union 11 are the same and are all M20 × 1.5 internal thread unions. The sizes of the first external thread fixed joint 21, the second external thread fixed joint 22 and the third external thread fixed joint 23 are M20 multiplied by 1.5 correspondingly.
It should be noted that, in this embodiment, the first valve 17, the second valve 24, and the third valve 26 are disposed at the lower ends of the first connecting pipe 19, the second connecting pipe 25, and the third connecting pipe 27, and are close to the middle internal thread union 14, the left internal thread union 8, and the right internal thread union 11, so that the structures of the bypass pipelines are firmer, and the connection pipes are prevented from shaking due to being too thin.
Example 2
The embodiment provides a method for calibrating a large and medium-sized marine pressure type depth finder by using the calibration system of embodiment 1, which comprises the following specific steps:
according to the number of calibrated large and medium ocean pressure type depth finders, namely calibrated instruments, a calibration device is prepared: if the number of the calibrated instruments is less than or equal to 9, one calibrating device can be independently used, and if the number of the calibrated instruments is more than 9, a plurality of calibrating devices are serially connected for use. Depending on the specific number of instruments being calibrated, it is determined whether the center channel bypass assembly 13, the left channel bypass assembly 9, and the right channel bypass assembly 10 employ a single channel bypass assembly, a dual channel bypass assembly, or a three channel bypass assembly. In this embodiment, a single-channel bypass component is adopted as the middle-channel bypass component 13, a dual-channel bypass component is adopted as the left-channel bypass component 9, and a three-channel bypass component is adopted as the right-channel bypass component 10.
And (3) preparing for constant temperature, namely placing the pressure standard, the instrument to be calibrated and the calibrating device in a constant temperature chamber with the temperature of (20 +/-1) DEG C and stabilizing for more than 4 h.
Placing the calibrated instrument on a platform and fixing; the laser level is used as horizontal reference auxiliary equipment, the height of the platform is adjusted to enable the reference positions of the calibrated instrument and the pressure standard to be on the same horizontal line as much as possible, and the influence of the potential difference on the calibration result is reduced.
Connecting the data output end of the calibrated instrument to a COM port of a computer through a special data line; the computer obtains information related to the pressure indication, the original value (if available), the coefficient (if available), etc. of the calibrated instrument under the current barometric conditions. And simultaneously recording the current atmospheric pressure value displayed by a standard barometer in the thermostatic chamber, wherein the current atmospheric pressure value is the standard value (or reference value) of the initial zero point of the pressure.
According to the number of calibrated instruments, plugging of a corresponding number of female threaded unions 18 of the middle channel bypass assembly 13, the left channel bypass assembly 9 and the right channel bypass assembly 10 is opened, and valves 17, 24, 26 corresponding to the middle channel bypass assembly 13, the left channel bypass assembly 9 and the right channel bypass assembly 10 are opened.
Connecting the first external thread joint of the calibration device with the corresponding internal thread joint of the pressure outlet of the pressure standard device to form a multi-channel measurement system; and (3) properly discharging the pressure transmission medium from the internal thread movable joints of the middle channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly through pre-pressing in advance in the pressure standard device so as to expel air bubbles in the calibration device.
The pressure interface of the calibrated instrument is connected to one end 162 of the pressure adapter and sebacate (pressure transmitting medium) is injected from the other end 161 of the pressure adapter using an injection needle tubing to expel air bubbles therein.
The other end 161 of the pressure adaptor to which the calibrated instrument is connected to female threaded unions 18 corresponding to the center channel bypass assembly 13, the left channel bypass assembly 9 and the right channel bypass assembly 10.
And starting normal operation of a pressure increasing stroke and a pressure reducing stroke by using the pressure standard device, uniformly creating a plurality of standard pressure reference points in the measuring range of the detected instrument, and recording the magnitude of the standard pressure reference points. During this process, the computer continuously records and obtains data relating to pressure readings of the calibrated instrument.
After the lifting downward stroke is finished, the other end 161 of the pressure adapter of the calibrated instrument is disconnected with the corresponding female threaded union 18.
The computer keeps records and obtains relevant data such as pressure indication value of the calibrated instrument. The pressure indication of the calibration instrument at the end zero is recorded.
After the test is finished, the valves of the middle channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly are closed, and the internal thread movable joints 18 are sealed by plugging.
And finally, comparing the pressure indicating value data of the calibrated instrument with the pressure standard value provided by the pressure standard device after air pressure correction, thereby obtaining the 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 calibration formula, the pressure original value data, the pressure temperature compensation data and the like can be corrected to generate a new calibration coefficient.
And (4) compiling relevant information such as calibration experiment conditions, standard value data, pressure indicating value data, measurement uncertainty of a calibration result and the like into the certificate to form a calibration certificate.
Various corresponding changes and modifications can be made by those skilled in the art based on the above technical solutions and concepts, and all such changes and modifications should be included in the protection scope of the present invention.
Claims (10)
1. A large and medium-sized ocean pressure type depth sounder calibration system is characterized by comprising a pressure standard and a calibration device;
the calibration device comprises an external thread connector, a filter, a transfer column, a left transfer pipe, a platform, a left transfer column, a left channel bypass assembly, a right transfer column, a middle channel bypass assembly, a right transfer pipe and a pressure transfer piece;
the platform is provided with a middle transfer connecting column, a left transfer connecting column and a right transfer connecting column, the middle transfer connecting column and the left transfer connecting column are mutually communicated through a left transfer connecting pipe, and the middle transfer connecting column and the right transfer connecting column are mutually communicated through a right transfer connecting pipe; the middle transfer column is communicated with an outlet of the filter, and an inlet of the filter is communicated with the first external thread joint; the external thread joint is used for connecting a pressure outlet of the pressure standard;
the middle transfer post, the left transfer post and the right transfer post are respectively communicated with the middle channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly; the middle channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly respectively comprise one or more internal thread movable joints, and each internal thread movable joint is provided with a detachable plug for sealing the internal thread movable joint; the internal thread movable joints of the middle channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly are respectively connected with a first connecting pipe with a first valve, a second connecting pipe with a second valve and a third connecting pipe with a third valve, and the first connecting pipe, the second connecting pipe and the third connecting pipe are respectively connected with a middle transfer column, a left transfer column and a right transfer column;
and the internal thread movable joints of the middle channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly are connected with a pressure interface of the calibrated instrument through a pressure adaptor.
2. The calibration system of claim 1, wherein the center channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly can adopt a single channel bypass assembly, a double channel bypass assembly or a three channel bypass assembly; the single-channel bypass assembly only comprises a single internal thread movable joint, and the internal thread movable joint of the single-channel bypass assembly is communicated with the first connecting pipe, the second connecting pipe or the third connecting pipe; the two-channel bypass assembly comprises two internal thread movable joints, the two internal thread movable joints of the two-channel bypass assembly are respectively communicated with two ports of the tee joint, and the rest port of the tee joint is communicated with the first connecting pipe, the second connecting pipe or the third connecting pipe; the three-channel bypass assembly comprises three internal thread movable joints, the three internal thread movable joints of the three-channel bypass assembly are respectively communicated with three ports of a four-way, and the rest port of the four-way is communicated with the first connecting pipe, the second connecting pipe or the third connecting pipe.
3. The calibration system of claim 1, wherein the pressure standard employs a piston gauge of class 0.005 or a digital gauge and pressure controller of class 0.01.
4. The calibration system of claim 1, wherein the platform has four adjustable height legs.
5. The calibration system of claim 1, wherein the pipeline connecting the female union with the first connecting pipe, the second connecting pipe and the third connecting pipe, and the first connecting pipe, the second connecting pipe and the third connecting pipe are elastic clamping sleeves, the outer diameter is 3.17mm, and the wall thickness is 1mm.
6. The calibration system according to claim 1, wherein the filter is a pre-particulate filter with a filter particle size of 7 μm, resistant to a pressure of 60 MPa.
7. The calibration system of claim 1, wherein the middle transfer post is a four-way structure, and the left transfer post and the right transfer post are both two-way structures.
8. The calibration system of claim 1, wherein the left-turn adapter and the right-turn adapter are both made of metal tubes with 60MPa high pressure resistance, 6mm outer diameter and 2mm wall thickness.
9. The calibration system of claim 1, wherein the middle transfer post, the left transfer post, and the right transfer post are connected with the middle female union, the left female union, and the right female union, respectively; connecting pipe one, connecting pipe two and connecting pipe three are connected with external screw thread fixed joint one, external screw thread fixed joint two and external screw thread fixed joint three respectively, external screw thread fixed joint one, external screw thread fixed joint two and external screw thread fixed joint three respectively with well female thread union, left female thread union and right female thread union accordant connection, thereby realize well transit post, left transit post and the intercommunication of right transit post and well passageway bypass subassembly, left passageway bypass subassembly and right passageway bypass subassembly.
10. A method for calibrating a large and medium-sized marine pressure type depth sounder by using the calibration system according to any one of claims 1 to 9, which is characterized by comprising the following steps:
determining the number of the internal thread movable joints of the middle channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly according to the number of calibrated large and medium ocean pressure type depth finders, namely calibrated instruments;
preparing for constant temperature, namely placing the pressure standard, the instrument to be calibrated and the calibrating device in a constant temperature chamber with the temperature of 20 +/-1 ℃ and stabilizing for more than 4 h;
placing the calibrated instrument on a platform and fixing; the laser level is used as horizontal reference auxiliary equipment, the height of the platform is adjusted to enable the reference positions of the calibrated instrument and the pressure standard to be on the same horizontal line as much as possible, and the influence of the potential difference on the calibration result is reduced;
connecting the data output end of the calibrated instrument to the COM port of the computer through a special data line; the computer obtains a pressure indication value of the calibrated instrument under the current air pressure condition; simultaneously recording the current atmospheric pressure value displayed by a standard barometer in the thermostatic chamber, wherein the current atmospheric pressure value is the standard value of the initial zero point of the pressure;
according to the number of the calibrated instruments, plugging the female threaded movable joints with the corresponding number of the middle channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly, and opening valves corresponding to the middle channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly;
connecting the first external thread joint of the calibration device with the corresponding internal thread joint of the pressure outlet of the pressure standard device to form a multi-channel measurement system; pre-pressing in advance in the pressure standard device, and properly discharging pressure transmission media from each internal thread union of the middle channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly for expelling air bubbles in the calibration device;
connecting a pressure interface of the calibrated instrument with one end of a pressure adapter, and injecting a pressure transmission medium from the other end of the pressure adapter by using an injection needle tube to expel air bubbles in the pressure transmission medium;
connecting the other end of the pressure adaptor connected with the calibrated instrument to internal thread movable joints corresponding to the middle channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly;
starting normal operations of a pressure increasing stroke and a pressure reducing stroke by using a pressure standard device, uniformly creating a plurality of standard pressure reference points in the measuring range of the detected instrument, and recording the magnitude of the standard pressure reference points; during the process, the computer continuously records and obtains the pressure indication value of the calibrated instrument;
after the lifting down stroke is finished, the other end of the pressure adapter of the calibrated instrument is disconnected with the corresponding internal thread movable joint;
the computer keeps record and obtains the pressure indication value of the calibrated instrument; at this time, the pressure indication value of the calibration instrument at the tail zero point is recorded;
after the test is finished, closing valves of the middle channel bypass assembly, the left channel bypass assembly and the right channel bypass assembly, and sealing each internal thread union by using plugs;
at the later stage, the pressure indicating value data of the calibrated instrument is compared with the pressure standard value provided by the pressure standard instrument after air pressure correction, so that the indicating value error of the calibrated instrument is obtained;
and (4) compiling relevant information such as calibration experiment conditions, standard value data, pressure indicating value data, measurement uncertainty of a calibration result and the like into the certificate to form a calibration certificate.
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