CN217384303U - High-precision underwater temperature and depth measuring device - Google Patents

High-precision underwater temperature and depth measuring device Download PDF

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CN217384303U
CN217384303U CN202221266930.8U CN202221266930U CN217384303U CN 217384303 U CN217384303 U CN 217384303U CN 202221266930 U CN202221266930 U CN 202221266930U CN 217384303 U CN217384303 U CN 217384303U
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shell
temperature
cavity
lithium battery
measuring device
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胡泽琛
徐凡
孙天阳
刘新
吴晟
徐重阳
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Research Institute Of Yantai Harbin Engineering University
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Research Institute Of Yantai Harbin Engineering University
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Abstract

The utility model relates to a high-precision underwater temperature and depth measuring device, which belongs to the technical field of instruments and meters and comprises a shell, a temperature sensor, a pressure sensor, a control system, a lithium battery and a binding post; the shell is a sealed cavity surrounded by a bottom wall, a side wall and a top wall, the temperature sensor is fixed on the outer side of the bottom wall of the shell, the pressure sensor is fixed on the inner side of the bottom wall of the shell, the pressure sensor and the bottom wall are provided with a water storage cavity, the water storage cavity is communicated with the outside of the shell through an opening, the control system and the lithium battery are fixed in the shell, and the wiring terminal is fixed on the outer side of the top wall of the shell; the control system is electrically connected with the temperature sensor, the pressure sensor, the lithium battery and the wiring terminal, and the lithium battery is electrically connected with the wiring terminal. The utility model discloses be in the same place temperature and pressure detection are integrated, make data accuracy high, the error is little, can be used to the deep detection of the temperature under water of various occasions, have direct reading formula concurrently simultaneously and hold the formula function certainly, make things convenient for the storage and the transmission of data.

Description

High-precision underwater temperature and depth measuring device
Technical Field
The utility model relates to a temperature depth measuring device especially relates to a high accuracy is temperature depth measuring device under water, and it belongs to instrument and meter technical field.
Background
Temperature and depth are the most basic elements of the marine environment, can reflect the physical conditions of the sea, and are the most commonly used parameters in various marine devices. The data of the temperature and the pressure under the ocean can provide important help for oceanographic weather, oceanographic scientific research and ocean development and utilization.
In engineering, data of temperature and pressure are often required to be measured at one underwater position of the ocean, the two physical quantities are measured by the temperature sensor and the pressure sensor respectively, the identity of the measured data is difficult to guarantee, and data fusion and data compensation of two parameters are not facilitated. In the prior art, in practical applications of temperature and pressure sensors, a pressure measurement part is affected by temperature changes, so that accurate temperature data is required to compensate pressure measurement values. Due to the influence of factors such as the self-heating effect of the thermistor, the stability of the constant current source and the thermal electromotive force, the accuracy of data of the temperature measurement part is reduced to a certain extent. Therefore, a high-precision underwater temperature and depth measuring device is needed, which can correct and calibrate the temperature measurement value and calibrate the pressure measurement value after temperature compensation, and has high accuracy of measurement data and small error.
SUMMERY OF THE UTILITY MODEL
The utility model aims at: for overcoming exist not enough among the prior art, the utility model provides a high accuracy is temperature measuring device deeply under water, with temperature and pressure detection integrated together, and have data correction and mark the function, make data accuracy high, the error is little.
The utility model provides an above-mentioned technical problem's technical scheme as follows:
a high-precision underwater temperature and depth measuring device comprises a shell, a temperature sensor, a pressure sensor, a control system, a lithium battery and a wiring terminal; the shell is a sealed cavity surrounded by a bottom wall, a side wall and a top wall, the temperature sensor is fixed on the outer side of the bottom wall of the shell, the pressure sensor is fixed on the inner side of the bottom wall of the shell, the pressure sensor and the bottom wall are provided with a water storage cavity, the water storage cavity is communicated with the outside of the shell through an opening, the control system and the lithium battery are fixed in the shell, and the wiring terminal is fixed on the outer side of the top wall of the shell; the control system is electrically connected with the temperature sensor, the pressure sensor, the lithium battery and the wiring terminal, and the lithium battery is electrically connected with the wiring terminal.
Furthermore, the shell is cylindrical and is made of a pressure-resistant and corrosion-resistant metal material.
Further, the housing comprises a first cavity and a second cavity which are communicated with each other; the first cavity and the second cavity are respectively located at the bottom and the top of the shell, the control system is fixed inside the first cavity, and the lithium battery is fixed inside the second cavity.
Furthermore, a first protective shell is arranged on the outer side of the bottom wall of the shell, the water storage cavity is communicated with the interior of the first protective shell, and the temperature sensor is arranged in the first protective shell; the shell body top wall outer side is provided with a second protective shell, and the wiring terminal is arranged inside the second protective shell.
Furthermore, a plurality of through holes are uniformly distributed on the side wall of the first protection shell.
Furthermore, the control system comprises a temperature sensing module, a pressure sensing module, a signal processing and converting module, a main controller, a data storage module, a communication module, a clock module and a power supply module.
Furthermore, the temperature measurement value is corrected and calibrated and the pressure measurement value after temperature compensation is calibrated respectively through a temperature acquisition program and a pressure acquisition program in the main controller.
Compared with the prior art, the beneficial effects of the utility model are that: and the signal processing and converting module adopts a high-precision ADC chip, so that the precision of data measurement is guaranteed. The main controller controls the working state of the switch by outputting a high-frequency PWM signal to realize forward and reverse measurement, thereby achieving the purposes of inhibiting the self-heating of the thermistor and eliminating the thermoelectromotive force. The data acquisition program driving system acquires and processes original data and stores the processed data or sends the processed data to an upper computer through a cable. The correction and calibration of the data adopt a linear least square method, so that the data are more accurate. The utility model discloses the data accuracy is high, the error is little, has direct reading formula and holds the formula function certainly concurrently simultaneously, makes things convenient for the storage and the transmission of data, can be used to the deep detection of the temperature under water of various occasions.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a side view of the present invention;
FIG. 3 is a schematic view of the internal structure of the present invention;
fig. 4 is a system block diagram of the present invention;
FIG. 5 is a block diagram of the temperature measuring circuit of the present invention;
fig. 6 is a block diagram of the pressure measurement circuit of the present invention;
fig. 7 is a schematic diagram of a lead of the temperature sensor of the present invention.
In the figure, 1, a temperature sensor; 2. a pressure sensor; 3. a heat insulating pad; 4, through holes; 5. a first cavity; 6. a second cavity; 7. a first protective case; 8. a binding post; 9. a second protective shell; 10. a housing; 11. opening a hole; 12. a water storage cavity; 13. a control system; 14. a lithium battery.
Detailed Description
The principles and features of the present invention will be described with reference to fig. 1 to 7, which are provided for illustration only and are not intended to limit the scope of the present invention.
As shown in fig. 1 to 3, a high-precision underwater temperature and depth measuring device comprises a shell 10, a temperature sensor 1, a pressure sensor 2, a control system 13, a lithium battery 14 and a binding post 8; casing 10 encloses into sealed cavity by diapire, lateral wall and roof, temperature sensor 1 is fixed in the 10 diapire outsides of casing, pressure sensor 2 is fixed at 10 diapire inboards of casing, be provided with water storage chamber 12 between pressure sensor 2 and the 10 diapire of casing, water storage chamber 12 communicates with each other through trompil 11 and casing 10 outside, and the measured water body flows into water storage chamber 12 through trompil 11 in, the measuring pressure of being convenient for. The front end of the pressure sensor 2 is also provided with a heat insulation pad 3 for protecting the pressure sensor 2.
The control system 13 and the lithium battery 14 are fixed inside the shell 10, and the wiring terminal 8 is fixed on the outer side of the top wall of the shell 10 and used for transmitting data and charging; the control system 13 is respectively electrically connected with the temperature sensor 1, the pressure sensor 2, the lithium battery 14 and the binding post 8, and the lithium battery 14 is electrically connected with the binding post 8.
The housing 10 is cylindrical and made of a pressure-resistant and corrosion-resistant metal material.
The shell 10 comprises a first cavity 5 and a second cavity 6 which are communicated with each other; the first cavity 5 and the second cavity 6 are respectively located at the bottom and the top of the shell 10, the control system 13 is fixed inside the first cavity 5, and the lithium battery 14 is fixed inside the second cavity 6.
A first protective shell 7 is arranged on the outer side of the bottom wall of the shell 10, and the water storage cavity 12 is communicated with the interior of the first protective shell 7; the second protective housing 9 is arranged on the outer side of the top wall of the shell 10, the temperature sensor 1 is arranged inside the first protective housing 7, the temperature sensor 1 can be protected from being damaged, the wiring terminal 8 is arranged inside the second protective housing 9, and the wiring terminal 8 is protected from being corroded by seawater.
And a plurality of through holes 4 are uniformly distributed on the side wall of the first protective shell 7. In this embodiment, the quantity of through-hole 4 is four, and the measured water body passes through-hole 4 business turn over first protecting sheathing 7 has guaranteed measuring environment's stability.
As shown in fig. 4, the control system 13 includes a temperature sensing module, a pressure sensing module, a signal processing and converting module, a main controller, a data storage module, a communication module, a clock module, and a power module.
The temperature sensing module and the pressure sensing module convert the physical quantities measured by the temperature sensing module and the pressure sensing module into voltage signals and output the voltage signals; the voltage signal is filtered, amplified and converted by the signal processing and converting module, finally converted into a corresponding digital signal, and input into the high-precision main controller in an SPI communication mode; the main controller processes data according to a preset program, controls the working state of the switch by outputting a high-frequency PWM (pulse-width modulation) signal, and performs temperature compensation, calculation and fitting on the voltage signal; the data storage module is used for storing the processed data; the communication module transmits the processed data to an upper computer interface for real-time display; the clock module provides accurate time for the system; the power module supplies power to the control system 13 through a lithium battery 14.
And respectively correcting and calibrating the temperature measurement value and calibrating the pressure measurement value after temperature compensation through a temperature acquisition program and a pressure acquisition program in the main controller.
The specific steps of nonlinear correction and data calibration in the temperature part are as follows:
(1) firstly, under the same seawater environment condition, the temperature part is subjected to nonlinear correction and data calibration, the temperature sensor 1 and the pressure sensor 2 are simultaneously used for measuring, and the T-R data value of the system and the temperature value detected by a comparison instrument are recorded when the temperature is stable.
(2) Secondly, using the formula
Figure BDA0003661367320000051
Fitting the temperature and resistance value data on the basis of variable conversion to obtain fitting coefficients and substituting the fitting coefficients into a formula to solve a new temperature value T 1 。
(3) Let T 2 For comparing the output parameter values of the instrument, a fourth-order polynomial fitting model T is established 2 ＝b 0 +b 1 T 1 +b 2 T 1 2 +b 3 T 1 3 +b 4 T 1 4 Thus, it is paired with T 1 And T 2 Fitting to find the output of the measuring systemAnd obtaining a calibration parameter according to the relationship between the parameter value and the output parameter values of the temperature sensor 1 and the pressure sensor 2.
(4) And finally, inputting the calibration parameters into the system, and modifying a calculation formula in the program.
The steps of pressure part specific data (temperature compensated) calibration are as follows:
(1) firstly, under the same environmental condition, the specific data (subjected to temperature compensation) of a pressure part is calibrated, the pressure is measured simultaneously by the temperature sensor 1 and the pressure sensor 2, the pressure is gradually applied to the instrument by hydraulic mercury, and the pressure value measured by the system and the pressure value detected by a comparison instrument are recorded when the pressure is stable.
(2) Secondly, a second-order polynomial model P is adopted 2 ＝a 0 +a 1 P 1 +a 2 P 1 2 Measured value P of the system 1 And contrast instrument detection P 2 Fitting, and back-substituting the model after solving the calibration coefficient to obtain the final calculation formula.
As shown in fig. 5 to 6, the temperature sensor 1 is an NTC thermistor, the pressure sensor 2 is a diffused silicon piezoresistive pressure sensor, and the temperature measuring circuit and the pressure measuring circuit in the signal processing and converting module each use an AD7793 chip for analog-to-digital conversion.
As shown in FIG. 7, the NTC thermistor and its external reference resistor R ref The excitation current is provided by a constant current source arranged in the ADC chip, and the current is supplied to corresponding elements through two loops respectively.
The working process of the device is as follows: the temperature sensing module and the pressure sensing module sense the change of the seawater environment through the temperature sensor 1 and the pressure sensor 2, convert seawater temperature and pressure measurement values into corresponding voltage signals, effectively eliminate the influence of noise through the signal processing and conversion module and convert the noise into digital signals, and then transmit the digital signals into the main controller. And the main controller obtains final data through a set calculation process. On one hand, the acquired data is stored in the data storage module, and on the other hand, the acquired data is transmitted to an upper computer interface through the communication module to be displayed in real time. The clock module takes on the task of providing system specific clock information. When measuring data, the staff can carry out the visual reading of data through the host computer interface, knows the parameter variation of sea water environment in real time. After the measurement work is finished, the information stored in the data storage module can be led into an upper computer through the communication module, and the worker can conduct subsequent analysis according to the data.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (7)

1. The utility model provides a high accuracy is temperature and depth measuring device under water which characterized in that: the temperature and humidity sensor comprises a shell (10), a temperature sensor (1), a pressure sensor (2), a control system (13), a lithium battery (14) and a binding post (8); the shell (10) is a sealed cavity surrounded by a bottom wall, side walls and a top wall, the temperature sensor (1) is fixed on the outer side of the bottom wall of the shell (10), the pressure sensor (2) is fixed on the inner side of the bottom wall of the shell (10), a water storage cavity (12) is arranged between the pressure sensor (2) and the bottom wall of the shell (10), the water storage cavity (12) is communicated with the outside of the shell (10) through an opening (11), the control system (13) and the lithium battery (14) are fixed in the shell (10), and the wiring terminal (8) is fixed on the outer side of the top wall of the shell (10); the control system (13) is respectively electrically connected with the temperature sensor (1), the pressure sensor (2), the lithium battery (14) and the wiring terminal (8), and the lithium battery (14) is electrically connected with the wiring terminal (8).
2. The high-precision underwater temperature and depth measuring device according to claim 1, wherein: the shell (10) is cylindrical and is made of a pressure-resistant and corrosion-resistant metal material.
3. The high-precision underwater temperature and depth measuring device according to claim 2, wherein: the shell (10) comprises a first cavity (5) and a second cavity (6) which are communicated with each other; the first cavity (5) and the second cavity (6) are respectively located at the bottom and the top of the shell (10), the control system (13) is fixed inside the first cavity (5), and the lithium battery (14) is fixed inside the second cavity (6).
4. The high-precision underwater temperature and depth measuring device according to claim 3, wherein: a first protective shell (7) is arranged on the outer side of the bottom wall of the shell (10), the water storage cavity (12) is communicated with the interior of the first protective shell (7), and the temperature sensor (1) is arranged in the first protective shell (7); the outer side of the top wall of the shell (10) is provided with a second protective shell (9), and the wiring terminal (8) is arranged inside the second protective shell (9).
5. The high-precision underwater temperature and depth measuring device according to claim 4, wherein: a plurality of through holes (4) are uniformly distributed on the side wall of the first protective shell (7).
6. The high-precision underwater temperature and depth measuring device according to claim 1, wherein: the control system (13) comprises a temperature sensing module, a pressure sensing module, a signal processing and converting module, a main controller, a data storage module, a communication module, a clock module and a power supply module.
7. The high-precision underwater temperature and depth measuring device according to claim 6, wherein: and respectively correcting and calibrating the temperature measurement value and calibrating the pressure measurement value after temperature compensation through a temperature acquisition program and a pressure acquisition program in the main controller.
CN202221266930.8U 2022-05-25 2022-05-25 High-precision underwater temperature and depth measuring device Active CN217384303U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202221266930.8U CN217384303U (en) 2022-05-25 2022-05-25 High-precision underwater temperature and depth measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202221266930.8U CN217384303U (en) 2022-05-25 2022-05-25 High-precision underwater temperature and depth measuring device

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CN217384303U true CN217384303U (en) 2022-09-06

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