CN109405866B - Detection calibration method and device of temperature and salt depth measuring instrument based on multipoint constant-temperature water tank - Google Patents
Detection calibration method and device of temperature and salt depth measuring instrument based on multipoint constant-temperature water tank Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 108
- 150000003839 salts Chemical class 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000001514 detection method Methods 0.000 title claims abstract description 13
- 239000013535 sea water Substances 0.000 claims abstract description 32
- 238000012544 monitoring process Methods 0.000 claims abstract description 16
- 238000005259 measurement Methods 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 8
- 238000012937 correction Methods 0.000 claims description 7
- 230000036760 body temperature Effects 0.000 claims description 2
- 238000001816 cooling Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000003756 stirring Methods 0.000 description 11
- 238000004321 preservation Methods 0.000 description 10
- 238000010923 batch production Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a detection and calibration method and a detection and calibration device of a marine thermal salt depth measuring instrument based on a multi-point constant-temperature water tank, wherein the multi-point constant-temperature water tank comprises a plurality of independent temperature control water tanks; each having a different temperature control target temperature; the salinity of the seawater in the temperature control water tank is kept between 30PSU and 40 PSU; the high-precision temperature salt measuring instrument is used for providing a high-precision temperature value for controlling the temperature of the water tank and a conductivity value of the seawater, and is used as a monitoring instrument for monitoring the fluctuation of the seawater in the water tank. According to the invention, the cooling link is removed, the temperature control process time is reduced, the main time is used for a high-precision constant temperature control process, the calibration and detection efficiency of the temperature and salt depth measuring instrument is improved, and the mass production efficiency of the temperature and salt depth measuring instrument is accelerated.
Description
Technical Field
The invention belongs to the field of ocean temperature and salt depth measuring instruments, and particularly relates to a detection and calibration method of an ocean temperature and salt depth measuring instrument based on a multipoint constant-temperature water tank.
Background
The use of the temperature and salt depth measuring instrument in marine environment observation needs to be measured and calibrated before and after delivery in use and maintenance so as to ensure the use precision and data quality control of the temperature and salt depth measuring instrument. In the measurement calibration, the calibration of the temperature and salt parameters is carried out in a high-precision constant-temperature water tank, natural ocean sea water is adopted, the calibration of the temperature and the conductivity parameters is completed by changing the temperature of the water body of the constant-temperature water tank based on the relation between the temperature and the conductivity of the water body and a 1978 practical salt standard conversion formula, and standard data of the temperature and the salinity are obtained by adopting a high-precision measurement temperature measuring bridge and a laboratory salinity meter.
The calibration method of the marine temperature and salt depth measuring instrument in China is based on the method in JJG 763-2002 temperature and salt depth measuring instrument verification procedure, and the temperature and conductivity calibration of the temperature and salt depth measuring instrument is realized by selecting eight temperature control points of 0 ℃, 5 ℃, 10 ℃, 15 ℃, 20 ℃, 25 ℃, 30 ℃ and 35 ℃ according to the actual use condition of the marine environment. In the existing metering calibration, a single water tank is adopted, and a heating and refrigerating device is used by a temperature control system, so that the calibration process from high temperature to low temperature is realized. In this process, 8 hours are usually required to complete, wherein the effective temperature control time at one temperature control point is only 10 minutes, the effective time for calibration is only 80 minutes, which is 16.7% of the time consumed in the whole calibration process, and the other 83.3% of the time is used for the cooling and temperature control process of the water tank according to the calculation of the whole metering calibration process completed in 8 hours. Therefore, the existing metering calibration mode greatly reduces the mass production efficiency of the temperature and salt depth measuring instrument.
Disclosure of Invention
Aiming at the restriction problem of the metering calibration process on the marine thermal salt depth batch production, the invention provides a detection calibration method of the marine thermal salt depth measuring instrument based on a multipoint constant temperature water tank, which uses the main time for the high-precision constant temperature control process by removing the cooling link and reducing the temperature control process time, improves the calibration and detection efficiency of the thermal salt depth measuring instrument and accelerates the batch production efficiency of the thermal salt depth measuring instrument.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a detection and calibration method of a marine thermal salt depth measuring instrument based on a multipoint constant temperature water tank comprises the following steps:
(1) The method comprises the steps of establishing a multipoint constant-temperature water tank, wherein the multipoint constant-temperature water tank comprises a plurality of independent temperature control water tanks, water bodies and temperature control modules among the water tanks are independent, and point-to-point control of the water tanks is realized by adopting a unified control data link; the temperature control water tanks respectively have different temperature control target temperatures;
(2) The high-precision warm salt measuring instrument is used as a standard instrument, and the measurement data is used as standard data; meanwhile, the device can be used as a monitoring instrument for monitoring the fluctuation of the water body temperature of the water tank, the fluctuation monitoring is realized by reading the data of the temperature salt measuring instrument in real time, and the monitoring is selected in the effective working area of the water tank; the high precision includes a temperature accuracy of + -0.002 deg.C and a conductivity accuracy of + -0.003 mS/cm.
(3) Ocean seawater is adopted in the temperature control water tank, the salinity value of the ocean seawater is between 30PSU and 40PSU, a laboratory salinity meter is adopted for controlling the salinity of the water body, and 200ml of water sample is extracted every month to analyze the salinity value;
(4) Detecting the conductivity of the water body of each temperature control water tank by using a temperature and salt depth measuring instrument for ocean to be detected, calculating the ratio of the conductivity to the standard seawater conductivity, and calculating the salinity;
(5) And (3) comparing with the standard value of the high-precision temperature salt measuring instrument in the step (2), and calculating a temperature calibration coefficient Ti and a conductivity calibration coefficient Ci based on a calibration numerical model of a least square method.
Further, the multipoint constant temperature water tank in the step (1) is composed of 8 independent temperature control water tanks, and the temperature control target temperature comprises: eight temperature control target temperatures of 0 ℃, 5 ℃, 10 ℃, 15 ℃, 20 ℃, 25 ℃, 30 ℃, 35 ℃.
Further, the temperature control fluctuation degree of the temperature control target temperature of the temperature control water tank in the step (1) is +/-0.003 ℃.
Further, the salinity calculating method in the step (4) comprises the following steps:
wherein,
s is a practical salinity value;
Δs is a salinity correction value;
a 0 ＝0.0080，a 1 ＝-0.1692，a 2 ＝25.3851，a 3 ＝14.0941，a 4 ＝-7.0261，a 5 ＝2.7081，∑a i = 35.0000, a practical salinity calculation factor;
b 0 ＝0.0005，b 1 ＝-0.0056，b 2 ＝-0.0066，b 3 ＝-0.0375，b 4 ＝0.0636，b 5 ＝-0.0144，∑b i =0.0000, a salinity correction value calculation factor;
K＝0.0162。
further, the calibrating method in the step (5) comprises the following steps:
obtaining standard values at each temperature control point, including: standard temperature T si Standard conductivity C si The calibrated instrument obtains a temperature original value R at each temperature control point ti Original value of conductivity R ci The temperature coefficient T is calculated according to a least square method by using the data i And conductivity coefficient C i The least square fitting calibration coefficient adopts fourth-order fitting.
In another aspect of the present invention, there is also provided a detection and calibration device of a marine thermal salt depth measuring instrument based on a multi-point constant temperature water tank, including:
the multi-point constant temperature water tank comprises a plurality of independent temperature control water tanks, and the water tanks are not physically connected, so that temperature interference is avoided; the temperature control water tanks respectively adopt independent temperature control modules to realize different temperature control target temperatures, and the temperature control modules are provided with built-in heaters and refrigerators; the standard instrument and the detected instrument are suspended in the effective area of the water tank; the salinity of the seawater in the temperature control water tank is kept between 30PSU and 40PSU, and a heat preservation cover is arranged for keeping the salinity stable in the water tank so as to reduce water evaporation;
the standard instrument is a high-precision temperature salt measuring instrument and is used for providing a high-precision temperature value for controlling the temperature of the water tank and a conductivity value of the seawater, and meanwhile, the standard instrument is used as a monitoring instrument for monitoring the fluctuation of the seawater in the water tank, and is suspended in the water tank and placed in an effective working area.
Further, the multi-point constant temperature water tank is composed of 8 independent temperature control water tanks, and the temperature control target temperature comprises: eight temperature control target temperatures of 0 ℃, 5 ℃, 10 ℃, 15 ℃, 20 ℃, 25 ℃, 30 ℃, 35 ℃.
Further, the heat preservation cover is provided with a cable hole and a heat preservation cover hanging ring, and the cable hole is used for passing through a cable of the instrument in the temperature control water tank; the heat preservation cover hanging ring is used for moving the heat preservation cover.
Furthermore, the temperature control water tank is provided with an instrument suspender, and a plurality of instrument positions suspended in the effective area of the water tank are arranged on the instrument suspender and are used for placing standard instruments and detected instruments.
Further, a stirring impeller is arranged at the bottom of the temperature control water tank and is connected with a stirring motor, and the stirring motor controls the stirring impeller to stir and rotate.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the cooling link is removed, the temperature control process time is reduced, the main time is used for a high-precision constant temperature control process, the calibration and detection efficiency of the temperature and salt depth measuring instrument is improved, and the mass production efficiency of the temperature and salt depth measuring instrument is accelerated.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is a graph of temperature versus conductivity for seawater salinity of 35.0 PSU;
FIG. 3 is a graph of temperature versus conductivity for seawater of different salinity.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In order to solve the problem of restriction of the metering calibration process to the deep batch production of marine warm salt, the invention adopts the following technical scheme:
first, it maintains consistency with existing national standards.
As shown in fig. 1, the invention comprises a multi-point constant temperature water tank, wherein the multi-point constant temperature water tank comprises a plurality of independent temperature control water tanks 1, and the water tanks are not physically connected, so that temperature interference is avoided; the temperature control water tanks respectively adopt independent temperature control modules 9 to realize different temperature control target temperatures, and the temperature control modules 9 are provided with built-in heaters and refrigerators; the standard instrument and the detected instrument are suspended in the effective area of the water tank; the salinity of the seawater in the temperature control water tank is kept between 30PSU and 40PSU, and a heat preservation cover 2 is arranged for keeping the salinity stable in the water tank so as to reduce water evaporation;
the standard instrument is a high-precision temperature salt measuring instrument 7 and is used for providing a high-precision temperature value for controlling the temperature of the water tank and a conductivity value of the seawater, and meanwhile, the standard instrument is used as a monitoring instrument for monitoring the fluctuation of the seawater in the water tank, and is suspended in the water tank and placed in an effective working area.
In this embodiment, the multipoint thermostatic water bath is composed of 8 independent temperature control water baths 1, and the temperature control target temperature thereof includes: eight temperature control target temperatures of 0 ℃, 5 ℃, 10 ℃, 15 ℃, 20 ℃, 25 ℃, 30 ℃ and 35 ℃ are consistent with the 'JJG 763-2002 temperature salt depth measuring instrument verification procedure', and the method comprises the following steps: the temperature control target temperature is 0 ℃, 5 ℃, 10 ℃, 15 ℃, 20 ℃, 25 ℃, 30 ℃, 35 ℃, and eight temperature control target temperatures, the temperature control fluctuation degree is +/-0.003 ℃, and the technical requirements of the national standard method are continued.
The heat preservation cover 2 is provided with a cable hole 4 and a heat preservation cover hanging ring 3, the cable hole 4 is used for a communication cable 5 of the instrument in the temperature control water tank to pass through, and the communication cable is connected with an upper computer; the heat preservation cover hanging ring 3 is used for moving the heat preservation cover.
The temperature control water tank 1 is provided with an instrument suspender 6, and the instrument suspender 6 is provided with a plurality of instrument positions suspended in an effective area of the water tank and used for placing a high-precision temperature salt measuring instrument 7 and a detected calibration temperature salt depth measuring instrument 8.
The bottom of the temperature control water tank is provided with a stirring impeller 11, the stirring impeller 11 is connected with a stirring motor 10, and the stirring motor 10 controls the stirring impeller 11 to stir and rotate.
Second, it is consistent with international ocean observation methods. In the metering and calibrating process, the problem of magnitude transmission is solved, and the feasibility of seawater salinity tracing is ensured. According to the requirements of 1978 practical salt standard, the salinity conversion is calculated by adopting the following formula:
wherein,
s is a practical salinity value;
Δs is a salinity correction value;
a 0 ＝0.0080，a 1 ＝-0.1692，a 2 ＝25.3851，a 3 ＝14.0941，a 4 ＝-7.0261，a 5 ＝2.7081，∑a i = 35.0000, a practical salinity calculation factor;
b 0 ＝0.0005，b 1 ＝-0.0056，b 2 ＝-0.0066，b 3 ＝-0.0375，b 4 ＝0.0636，b 5 ＝-0.0144，∑b i =0.0000, a salinity correction value calculation factor;
K＝0.0162。
it should be noted that: a0, a1, … …, a5 are the international utility salt standard formula convention, are utility salinity correction coefficients, the sum of which is 35.000, exactly equal to the standard salinity 35, and b0-b5 are the international utility salt standard formula convention, for correcting utility salinity values, the sum of which is 0.0; rt is the conductivity ratio, which is the ratio of the conductivity value measured on site to the conductivity value of the salinity 35 seawater; t represents the sea water temperature value measured in situ.
In practical salinity calculation and magnitude transfer, the key point is to calculate the conductivity ratio R t The method is essentially to measure the ratio of the seawater conductivity value to the standard seawater conductivity on site, calculate the practical salinity value according to the formula 1 and the formula 2, and realize the magnitude transfer relation with the standard seawater in the metering calibration. The salinity value of the water body is fixed by metering and calibrating in a conventional single water tank, and the corresponding conductivity value is obtained by adjusting the temperature of the water body due to the corresponding relation between the temperature of the water body and the conductivity of the water body, so that the uniformity relation between the temperature, the conductivity and the salinity is realized, and the conductivity precision is determined by the temperature control precision, as shown in figure 2.
Therefore, in the calibration, the conductivity of the standard seawater is related to the conductivity of the water sample in the water tank, and the salinity measurement problem is converted into the measurement problem of the conductivity of the water body. At the same time, the temperature determines the conductivity value of the water body under certain salinity. In the high-precision temperature control process, the conductivity under certain salinity can also keep the stability with high precision.
The calibration method comprises the following steps:
obtaining standard values at each temperature control point, including: standard temperature T si Standard conductivity C si The calibrated instrument is in each the temperature control point obtains the original temperature value R ti Original value of conductivity R ci The temperature coefficient T is calculated according to a least square method by using the data i And conductivity coefficient C i The least square fitting calibration coefficient adopts fourth-order fitting.
When the salinity of the seawater changes, the corresponding relationship between the temperature and the conductivity of the seawater is not influenced, as shown in figure 3.
The salinity of the seawater is in the interval of 30 PSU-40 PSU, and is a proportional change process. Therefore, the seawater salinity value of the multipoint water tank changes in the interval, and the linear proportional relation of the temperature and the conductivity for determining the seawater salinity is not changed. Therefore, the multipoint constant temperature water tank can realize high-precision conductivity measurement and high-precision measurement of salinity as long as the temperature control precision required by the calibration index is kept.
According to the magnitude transmission and tracing requirements in measurement, the indexes of the corresponding parameters of the standard appliance are 1/3 of the detected indexes, and the calibration use can be satisfied. In the rapid calibration and detection method based on the multipoint water tank, a high-precision temperature salt measuring instrument is required to be used as a standard instrument for providing a high-precision temperature value for controlling the temperature of the water tank and a conductivity value of the seawater, and meanwhile, the high-precision temperature salt measuring instrument is used as a monitoring instrument for monitoring the fluctuation of the seawater in the water tank.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (5)
1. The detection and calibration method of the temperature and salt depth measuring instrument based on the multipoint constant temperature water tank is characterized by comprising the following steps of:
(1) The method comprises the steps of establishing a multipoint constant-temperature water tank, wherein the multipoint constant-temperature water tank comprises a plurality of independent temperature control water tanks, water bodies and temperature control modules among the water tanks are independent, and point-to-point control of the water tanks is realized by adopting a unified control data link; the temperature control water tanks respectively have different temperature control target temperatures;
(2) The high-precision warm salt measuring instrument is used as a standard instrument, and the measurement data is used as standard data; meanwhile, the device can be used as a monitoring instrument for monitoring the fluctuation of the water body temperature of the water tank, the fluctuation monitoring is realized by reading the data of the temperature salt measuring instrument in real time, and the monitoring is selected in the effective working area of the water tank; the high precision includes a temperature accuracy of + -0.002 deg.C and a conductivity accuracy of + -0.003 mS/cm.
(3) Ocean seawater is adopted in the temperature control water tank, the salinity value of the ocean seawater is between 30PSU and 40PSU, a laboratory salinity meter is adopted for controlling the salinity of the water body, and 200ml of water sample is extracted every month to analyze the salinity value;
(4) Detecting the conductivity of the water body of each temperature control water tank by using a temperature and salt depth measuring instrument to be detected, calculating the ratio of the conductivity to the standard seawater conductivity, and calculating the salinity;
(5) And (3) comparing with the standard value of the high-precision temperature salt measuring instrument in the step (2), and calculating a temperature calibration coefficient Ti and a conductivity calibration coefficient Ci based on a calibration numerical model of a least square method.
2. The method for detecting and calibrating a salt depth measuring instrument based on a multipoint thermostatic water tank according to claim 1, wherein the multipoint thermostatic water tank in step (1) is composed of 8 independent temperature control water tanks, and the temperature control target temperature comprises: eight temperature control target temperatures of 0 ℃, 5 ℃, 10 ℃, 15 ℃, 20 ℃, 25 ℃, 30 ℃, 35 ℃.
3. The method for detecting and calibrating a temperature and salt depth measuring instrument based on a multipoint constant temperature water tank according to claim 1, wherein the temperature control fluctuation degree of the temperature control target temperature of the temperature control water tank in the step (1) is +/-0.003 ℃.
4. The method for detecting and calibrating a temperature and salt depth measuring instrument based on a multipoint thermostatic water tank according to claim 1, wherein the salinity calculating method in the step (4) is as follows:
wherein,
s is a practical salinity value;
Δs is a salinity correction value;
a 0 ＝0.0080，a 1 ＝-0.1692，a 2 ＝25.3851，a 3 ＝14.0941，a 4 ＝-7.0261，
a 5 ＝2.7081，∑a i = 35.0000, a practical salinity calculation factor;
b 0 ＝0.0005，b 1 ＝-0.0056，b 2 ＝-0.0066，b 3 ＝-0.0375，b 4 ＝0.0636，
b 5 ＝-0.0144，∑b i =0.0000, a salinity correction value calculation factor;
K＝0.0162。
5. the method for detecting and calibrating a salt depth measuring instrument based on a multipoint thermostatic water bath according to claim 1, wherein the method for calibrating in the step (5) is as follows:
obtaining standard values at each temperature control point, including: standard temperature T si Standard conductivity C si The calibrated instrument obtains a temperature original value R at each temperature control point ti Original value of conductivity R ci The data are used according to the mostThe temperature coefficient T is calculated by a small square method algorithm i And conductivity coefficient C i The least square fitting calibration coefficient adopts fourth-order fitting.
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| CN111272824B (en) * | 2020-03-23 | 2024-09-03 | 河北工业大学 | Detection device and detection method for underwater glider-mounted temperature and salt depth measuring instrument |
| CN113155903A (en) * | 2021-02-05 | 2021-07-23 | 国家海洋技术中心 | Stability evaluation method for ocean electrode type conductivity sensor |
| CN114636441B (en) * | 2022-02-23 | 2023-06-09 | 国家海洋技术中心 | Multi-parameter sensor suitable for underwater low-temperature high-pressure environment and testing method thereof |
| CN115979297B (en) * | 2022-10-31 | 2024-04-26 | 国家海洋标准计量中心 | Calibration system and calibration method for large and medium ocean pressure type depth sounder |
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