CN111664969A - Underwater free field pressure sensor - Google Patents
Underwater free field pressure sensor Download PDFInfo
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- CN111664969A CN111664969A CN201910177658.2A CN201910177658A CN111664969A CN 111664969 A CN111664969 A CN 111664969A CN 201910177658 A CN201910177658 A CN 201910177658A CN 111664969 A CN111664969 A CN 111664969A
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- plug
- tourmaline
- hose
- pressure sensor
- sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/16—Measuring force or stress, in general using properties of piezoelectric devices
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- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses an underwater free field pressure sensor which comprises a sensor body, wherein a first plug is arranged at the top end of the sensor body, a small hole is formed in the front end of the first plug, a hose is arranged in the middle of the sensor body, the hose is sealed and filled with silicon oil, tourmaline is arranged in the hose, a second plug is arranged at the lower end of the hose, a connecting lead is arranged at the lower end of the tourmaline, an IEPE amplifying circuit is arranged in the second plug, the connecting lead passes through the second plug and is connected with the IEPE amplifying circuit, and an output signal line is arranged at the bottom end of the second plug. The underwater free field pressure sensor provided by the invention adopts tourmaline piezoelectric crystals to manufacture the sensor, can sense pressure shock waves in any direction underwater, has high reliability and wide frequency response, and is suitable for underwater explosion tests.
Description
Technical Field
The invention relates to the technical field of underwater test sensors, in particular to an underwater free field pressure sensor.
Background
The underwater free field pressure sensor is used for testing explosion signals of a specific test piece in an ocean and a special pool, because the underwater environment is complex, ideal signals are difficult to obtain, the early underwater pressure test adopts a wall pressure sensor for testing, the sensor is made into a waterproof structure, the whole lead outputs signals, but water is not air, the underwater pressure test is carried out by using an air shock wave sensor, and the authenticity and the accuracy of the signals are not ideal. The underwater free field pressure sensor specially used for underwater explosion measurement always depends on import, has high price and long supply period, so that the sensor is usually manufactured by using a common overpressure sensor and a waterproof process and then placed in water for testing in China.
Disclosure of Invention
The invention provides an underwater free field pressure sensor, aiming at solving the problems that the direction of a pressure sensor for underwater testing can not be controlled and the frequency response of the sensor is low in the prior art.
The specific technical scheme is as follows:
the underwater free field pressure sensor comprises a sensor body, wherein a first plug is arranged at the top end of the sensor body, a small hole is formed in the front end of the first plug, a hose is arranged in the middle of the sensor body, the hose is sealed and filled with silicon oil, tourmaline is arranged in the hose, a second plug is arranged at the lower end of the hose, a connecting wire is arranged at the lower end of the tourmaline, an IEPE amplifying circuit is arranged in the second plug, the connecting wire penetrates through the second plug to be connected with the IEPE amplifying circuit, and an output signal line is arranged at the bottom end of the second plug.
Preferably, the first plug is a tapered polytetrafluoroethylene plug, and the second plug is a metal plug.
Preferably, the shell of the metal plug is a signal ground, and the exterior of the metal plug is provided with a thread.
Preferably, the tourmaline is tourmaline.
Preferably, the tourmaline is cut into pieces and has a size of Φ 6 × 1 mm.
Compared with the prior art, the invention has the following beneficial effects:
the underwater free field pressure sensor provided by the invention adopts tourmaline piezoelectric crystals to manufacture the sensor, can sense pressure shock waves in any direction underwater, has high reliability and wide frequency response, and is suitable for underwater explosion tests.
Drawings
Fig. 1 is a schematic structural diagram of an underwater free field pressure sensor according to the present invention.
In the figure, 1-a sensor body, 2-a first plug, 3-a small hole, 4-a hose, 5-tourmaline, 6-a second plug, 7-a connecting wire, 8-an output signal wire and 9-a thread.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention discloses an underwater free field pressure sensor, as shown in figure 1, which comprises a sensor body 1, wherein a first plug 2 is arranged at the top end of the sensor body 1, a small hole 3 is formed in the front end of the first plug 2, preferably, the first plug 2 is a conical polytetrafluoroethylene plug, a nylon wire is bound and buckled, the small hole 3 is formed in the front end of a conical head and used for threading and hanging a pressing block, the underwater free field pressure sensor is pulled by an integral output lead in water, the sensor naturally hangs down by the pressing block at the lower part, and the size of the pressing block can support the buoyancy of water resistance. The middle part of the sensor body 1 is provided with a hose 4, the hose 4 is in a sealing shape and is filled with silicon oil, and the first plug 2 can prevent the silicon oil from leaking. The soft tube 4 is internally provided with tourmaline 5, the tourmaline 5 is classified precious stones, preferably, the tourmaline 5 is tourmaline, the wall tourmaline is one of the tourmaline 5, and the color is various because of the piezoelectric effect, particularly, the hose is not sensitive to the directionality of the electric charges generated by pressing, namely, the pressure shock waves in any direction can excite the hose to generate the electric charges. The tourmaline 5 is cut into pieces with the size of phi 6 multiplied by 1mm, and the positive and negative polarities of two sides adopt the evaporation silver plating method, so that the wire welding is easy to obtain the pressure signal. The lower end of the hose 4 is provided with a second plug 6, the lower end of the tourmaline 5 is provided with a connecting wire 7, an IEPE amplifying circuit is arranged in the second plug 6, the connecting wire 7 passes through the second plug 6 to be connected with the IEPE amplifying circuit, and the connecting wire 7 and the metal plug are sealed by silica gel. An output signal line 8 is arranged at the bottom end of the second plug 6, and the output signal line 8 is hermetically connected with the metal plug by adopting an integral conducting wire connection process. The second plug 6 is a metal plug, the shell of the metal plug is a signal ground, the exterior of the metal plug is provided with threads 9, and the threads 9 of M10 multiplied by 1 on the metal plug are used for installation during production test. The metal plug is connected with the other end of the hose 4 and is still a nylon wire binding buckle, so that the metal plug can be used as a plug and also is a fixing point of the tourmaline 5 outgoing line.
The working principle is as follows: during testing, the underwater free-field pressure sensor is hung in water according to the depth required by the test, shock waves generated by explosion act on the sensor, a sensitive element tourmaline 5 of the sensor generates charge signals after being pressed and deformed, the charge signals are amplified and output voltage through a built-in IEPE circuit, and the whole process of testing the explosion pressure, including parameters such as pressure values, specific impulse, energy density, bubble pulsation and the like, is known through a recording and collecting instrument.
The sensor adopts a hydraulic dynamic testing method to test the voltage sensitivity.
The main technical indexes are as follows: frequency response: 600KHz (resonant frequency > 900KHz) rise time: 1us
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (5)
1. An underwater free field pressure sensor, characterized in that: the sensor comprises a sensor body, wherein a first plug is arranged at the top end of the sensor body, a small hole is formed in the front end of the first plug, a hose is arranged in the middle of the sensor body, the hose is sealed and filled with silicon oil, tourmaline is arranged in the hose, a second plug is arranged at the lower end of the hose, a connecting wire is arranged at the lower end of the tourmaline, an IEPE amplifying circuit is arranged in the second plug, the connecting wire penetrates through the second plug to be connected with the IEPE amplifying circuit, and an output signal line is arranged at the bottom end of the second plug.
2. The subsea free-field pressure sensor of claim 1, wherein: the first plug is a conical polytetrafluoroethylene plug, and the second plug is a metal plug.
3. The subsea free-field pressure sensor of claim 2, wherein: the shell of the metal plug is a signal ground, and threads are arranged outside the metal plug.
4. The subsea free-field pressure sensor of claim 1, wherein: the tourmaline is tourmaline.
5. The subsea free-field pressure sensor of claim 4, wherein: the tourmaline is cut into pieces with the size of phi 6 x 1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910177658.2A CN111664969A (en) | 2019-03-09 | 2019-03-09 | Underwater free field pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910177658.2A CN111664969A (en) | 2019-03-09 | 2019-03-09 | Underwater free field pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111664969A true CN111664969A (en) | 2020-09-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910177658.2A Pending CN111664969A (en) | 2019-03-09 | 2019-03-09 | Underwater free field pressure sensor |
Country Status (1)
| Country | Link |
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| CN (1) | CN111664969A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117030091A (en) * | 2023-09-11 | 2023-11-10 | 沈阳理工大学 | Novel underwater explosion near-field pressure measurement device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674383A (en) * | 2013-12-05 | 2014-03-26 | 中国科学技术大学 | Piezoelectric film type underwater explosion pressure sensor and measuring method thereof |
| CN103808456A (en) * | 2013-11-25 | 2014-05-21 | 邵建军 | Decomposing device for calibrated suite of underwater pressure sensor |
| CN104568241A (en) * | 2013-10-16 | 2015-04-29 | 瑟塞尔股份有限公司 | Method and apparatus for electrical gap setting for a piezoelectric pressure sensor |
| CN208313416U (en) * | 2018-06-15 | 2019-01-01 | 武汉扬吉科技有限公司 | A kind of clipping PVDF piezoelectric membrane aqueous medium shock wave transducer |
-
2019
- 2019-03-09 CN CN201910177658.2A patent/CN111664969A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568241A (en) * | 2013-10-16 | 2015-04-29 | 瑟塞尔股份有限公司 | Method and apparatus for electrical gap setting for a piezoelectric pressure sensor |
| CN103808456A (en) * | 2013-11-25 | 2014-05-21 | 邵建军 | Decomposing device for calibrated suite of underwater pressure sensor |
| CN103674383A (en) * | 2013-12-05 | 2014-03-26 | 中国科学技术大学 | Piezoelectric film type underwater explosion pressure sensor and measuring method thereof |
| CN208313416U (en) * | 2018-06-15 | 2019-01-01 | 武汉扬吉科技有限公司 | A kind of clipping PVDF piezoelectric membrane aqueous medium shock wave transducer |
Non-Patent Citations (2)
| Title |
|---|
| 余晓艳: "《有色宝石学教程 第2版》", 31 December 2016 * |
| 吴纪录等: "爆破压力传感器准静态校准装置应用研究", 《吴纪录等》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117030091A (en) * | 2023-09-11 | 2023-11-10 | 沈阳理工大学 | Novel underwater explosion near-field pressure measurement device |
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Application publication date: 20200915 |