CN112461415A - Full-sea-depth self-adaptive high-precision pressure conduction type cone penetration probe based on FBG (fiber Bragg Grating) - Google Patents
Full-sea-depth self-adaptive high-precision pressure conduction type cone penetration probe based on FBG (fiber Bragg Grating) Download PDFInfo
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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
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
- G01L1/246—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using integrated gratings, e.g. Bragg gratings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/06—Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
- G01L19/0618—Overload protection
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Abstract
The invention relates to a full-sea-depth self-adaptive high-precision pressure conduction type static cone penetration probe based on FBG (fiber Bragg Grating), which comprises a probe rod and a CPT (compact peripheral component interconnect) cone tip, wherein the probe rod is connected with the CPT cone tip through a probe rod connector, and a buffer rubber pad and a permeable stone are also arranged between the CPT cone tip and the probe rod connector; the n differential pressure sensors (n is more than or equal to 2) with the range increasing step by step are sequentially arranged in the probe connector from bottom to top, the adjacent differential pressure sensors are connected through the interlocking device to form a multi-step sensor nesting structure, when the full range of the low-range sensor is reached, the low-range sensor is locked through the interlocking device, the measurement is carried out through the next-stage higher-order differential pressure sensor, the range of the sensor can be protected, the optimal precision can be obtained under the condition of effective measurement, the self-adjustment of the range and the precision is realized, the mechanical property of the sediments in the deep sea bottom can be accurately obtained, and the probe connector has extremely important significance for deep sea scientific research, resource development engineering activities and ocean safety defense engineering.
Description
Technical Field
The invention relates to the field of testing of mechanical properties of submarine sediments, in particular to a full-sea-depth self-adaptive high-precision pressure conduction type cone penetration probe based on FBGs (fiber Bragg gratings).
Background
Around the research of the in-situ measuring device for the mechanical properties of the sediment at the sea bottom, the mechanical properties of the sediment in a shallow sea area with the depth of 4000m and below the sea bottom surface by 1-2m are measured, and the ocean static sounding equipment is researched and developed by Holland Huigui corporation and Van-Samboo corporation, so that the ocean static sounding equipment is successfully served for various ocean projects at home and abroad. At present, the CPT with the maximum working water depth is GOST developed by MARUM corporation in 2010, and the maximum working water depth is 4000 m.
The Fiber Bragg Grating (FBG) sensor has the working principle that measured changes are converted into strain or temperature changes on the FBG directly or by means of a certain device, so that the change of the central wavelength of the FBG is caused, and the measured value can be calculated from the change of the central wavelength of the grating by establishing and calibrating the relation between the change of the central wavelength of the FBG and the measured value. This type of sensor has its particularity: (1) the measuring range can be customized at will, and the precision is only related to the measuring range, namely, the precision is 1 per mill F.S (one thousandth of the full measuring range); (2) the optical fiber sensor exceeds 120 percent of the measuring range, irreversible destructive stretching damage is generated, and great potential safety hazard exists for long-term monitoring.
The in-situ test of the mechanical properties of the sediments at the deep sea level of 11000m full sea is always a hotspot and a difficult point of international deep sea observation and research, and the accurate acquisition of the mechanical properties of the sediments is extremely important for deep sea scientific research, resource and energy development engineering activities and ocean safety national defense engineering. The deep sea bottom shallow surface layer sediment mainly comprises soft mud, the main body of the particle component is less than 0.001mm, the sedimentation rate is about 4mm/ky, the intensity of the sediment on the sea bottom surface is 1-5kPa, the deep sea bottom is in a high-pressure environment, the pressure of the sea bottom in ten thousand meters deep sea is up to hundreds of MPa, and the problem that how to accurately distinguish the tiny change of the measuring resistance of the precipitation probe under the high background pressure is not solved internationally is solved.
If a mode of selecting a sensor with a proper measuring range according to the traditional method is adopted, the selection of which sensor is used for detection is difficult, and a device which can realize the mechanical property of the bottom sediment of the whole sea in the international world is proposed, however, the method is very lack of investigation and research on the deep sea environment at present, and insufficient knowledge on the distribution and change rule of the strength of the bottom sediment is lacked, so that the sensor can be directly scrapped in case of the bottom rock, on the other hand, an overload pressure can be generated when the probe penetrates into the water, the sensor explosion range can be caused by the overload pressure, and the device which can realize the mechanical property of the bottom sediment of the whole sea in the international world does not exist at present.
Disclosure of Invention
The invention provides a full-sea-depth self-adaptive high-precision pressure conduction type static cone penetration probe based on FBG (fiber Bragg Grating), which is based on a deep-sea differential pressure type fiber grating sensor with the precision of 1 thousandth F.S. and takes 100% measuring range as gradient to form a multi-stage sensor nested structure, so that the measuring range of the sensor can be protected, the optimal precision can be obtained under the condition of effective measurement, and the requirement on the in-situ test of the mechanical property of the full-sea deep-sea bottom sediment is met.
The invention is realized by adopting the following technical scheme: a full-sea-depth self-adaptive high-precision pressure conduction type cone penetration cone probe based on FBG is characterized by comprising a probe rod and a CPT cone tip, wherein the probe rod is connected with the CPT cone tip through a probe rod connector, and a buffer rubber pad and a permeable stone are arranged between the CPT cone tip and the probe rod connector;
a first-order differential pressure sensor, a second-order differential pressure sensor, … …, an n-1 th-order differential pressure sensor and an nth-order differential pressure sensor are sequentially arranged in the probe connector from bottom to top, wherein n is more than or equal to 2, the n differential pressure sensors are all differential pressure fiber grating sensors, the measuring ranges of the n differential pressure sensors are gradually increased from bottom to top, and adjacent differential pressure sensors are connected through an interlocking device; a super-pore pressure sensor is also arranged below the first-order differential pressure sensor, a lower cavity pore pressure passage of the super-pore pressure sensor is communicated with the permeable stone, and an upper cavity of the super-pore pressure sensor is abutted against the interlocking device to realize force transmission;
the interlocking device comprises a positive locking connecting sleeve and a negative locking connecting sleeve, the negative locking connecting sleeve is sleeved above the positive locking connecting sleeve, an accommodating space for accommodating the differential pressure sensor is formed between the positive locking connecting sleeve and the negative locking connecting sleeve, the front n-1-order differential pressure sensors are correspondingly arranged in the accommodating space matched with the positive locking connecting sleeve and the negative locking connecting sleeve, and the nth-order differential pressure sensor is positioned above the negative locking connecting sleeve; a first piston column base is arranged in the positive locking connecting sleeve, and the first piston column base is in sealing fit with the inner side wall of the bottom of a lower pressure chamber of the differential pressure sensor and reciprocates; a vertical sliding groove is further formed in the circumferential direction of the outer side wall of the positive locking connecting sleeve, a convex column which is matched with the vertical sliding groove and can slide up and down along the vertical sliding groove is further arranged in the circumferential direction of the front n-1 differential pressure sensors, and the convex column is fixedly connected with the inner wall of the lower edge of the negative locking connecting sleeve; during measurement, when the full range of the differential pressure sensor is reached, the locking of the differential pressure sensor is realized by limiting the convex column through the vertical sliding groove, and further the step-by-step locking of the front n-1 differential pressure sensors from bottom to top is realized.
Furthermore, the length of the vertical sliding chute is not more than the optical fiber of the differential pressure sensor matched with the vertical sliding chuteThe amount of reliable deformation; for example, assume that the sensor has a span K and a fiber length LK(initial length), when the measured data reaches 120% K, the corresponding optical fiber length is Lk+MAX△Lk(extreme value length), it is obvious that the reliable deformation of the optical fiber is MAX△LkIf the insurance coefficient is 90%, the length of the corresponding groove of the differential pressure sensor is 0.9MAX△Lk。
Furthermore, a water permeable hole and a second piston column base are further formed in the top surface of the back locking connecting sleeve, and the second piston column base is in sealing fit with the inner side wall of the bottom of the lower pressure chamber of the nth-order differential pressure sensor and moves in a reciprocating mode.
Compared with the prior art, the invention has the advantages and positive effects that:
the pressure conduction type static sounding conical probe structure comprises a multistage differential pressure sensor and an interlocking device thereof, is based on a deep sea differential pressure type fiber grating sensor with the precision of 1 thousandth F.S. and takes 100% of measuring range as gradient to form a multistage sensor nested structure, can protect the measuring range of the sensor, can obtain the best precision under the condition of effective measurement, realizes the self-adjustment of the measuring range and the precision, can accurately obtain the mechanical characteristics of the sediments at the bottom of the deep sea in the whole sea, and has extremely important significance for deep sea scientific research, resource energy development engineering activities and ocean safety national defense engineering.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a cone static cone penetration probe according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a partially enlarged structure of a cone-shaped static cone penetration probe according to an embodiment of the present invention;
FIG. 3 is a first cross-sectional structural view of FIG. 2;
FIG. 4 is a second cross-sectional structural view of FIG. 2;
FIG. 5 is a schematic diagram of the exploded structure of FIG. 2;
FIG. 6 is a schematic cross-sectional view of FIG. 5;
FIG. 7 is a schematic view of the interlock arrangement;
FIG. 8 is a schematic cross-sectional view of the interlock in an unactivated state;
FIG. 9 is a schematic cross-sectional view of the interlock device in an operating state;
FIG. 10 is a cross-sectional structural view of the interlock in a locked condition;
FIG. 11 is a schematic diagram of a multi-step differential pressure sensor nesting structure according to an embodiment of the present invention;
FIG. 12 is a schematic perspective view of the structure of FIG. 11;
wherein: 1. a probe rod; 2. a probe connector; 3. a CPT cone tip; 4. a cushion rubber pad; 5. a permeable stone; 6. an optical fiber; 7. a low-order sensor; 71. a convex column; 8. a high-order sensor; 9A, positively locking the connecting sleeve; 9B, reversely locking the connecting sleeve; 10. a super pore pressure sensor; 11. an upper pressure chamber; 12. a lower pressure chamber; 13. and (5) elastic plastic film.
Detailed Description
In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples.
In the embodiment, a full-sea-depth self-adaptive high-precision pressure conduction type static cone penetration probe based on FBG (fiber Bragg Grating) refers to fig. 1 and 2 and comprises a probe rod 1 and a CPT (compact particle transmission) cone tip 3, wherein the probe rod 1 is connected with the CPT cone tip through a probe rod connector 2, and a buffer rubber pad 4 and a permeable stone 5 are arranged between the CPT cone tip 3 and the probe rod connector 2;
a first-order differential pressure sensor (lowest range), a second-order differential pressure sensor (second lowest range), … …, an n-1 th-order differential pressure sensor (second highest range) and an nth-order differential pressure sensor (highest range) are sequentially arranged in the probe connector 2 from bottom to top, wherein n is more than or equal to 2, the n differential pressure sensors are all differential pressure fiber grating sensors, and the ranges of the n differential pressure sensors are gradually increased from bottom to top, for example, the range of the first-order differential pressure sensor is 1-10Pa, the range of the second-order differential pressure sensor is 10-100Pa, the range of the third-order differential pressure sensor is 100Pa-1Kpa, the range of the fourth-order differential pressure sensor is 1-10 Kpa, the range of the fifth-order differential pressure sensor is 10Kpa-100Kpa, and adjacent differential pressure sensors are connected through an interlocking device; a super-pore pressure sensor 10 is also arranged below the first-order differential pressure sensor, a lower cavity pore pressure passage of the super-pore pressure sensor 10 is communicated with the permeable stone 5, and the upper cavity side wall of the super-pore pressure sensor is abutted against an interlocking device to realize force transmission;
the interlocking device comprises a positive locking connecting sleeve and a negative locking connecting sleeve, the negative locking connecting sleeve is sleeved above the positive locking connecting sleeve, an accommodating space for accommodating the differential pressure sensor is formed between the positive locking connecting sleeve and the negative locking connecting sleeve, the front n-1-order differential pressure sensors are correspondingly arranged in the accommodating space matched with the positive locking connecting sleeve and the negative locking connecting sleeve, and the nth-order differential pressure sensor is positioned above the negative locking connecting sleeve; a first piston column base is arranged in the positive locking connecting sleeve, and the first piston column base is in sealing fit with the inner side wall of the bottom of a lower pressure chamber of the differential pressure sensor and reciprocates; a vertical sliding groove is further formed in the circumferential direction of the outer side wall of the positive locking connecting sleeve, a convex column which is matched with the vertical sliding groove and can slide up and down along the vertical sliding groove is further arranged in the circumferential direction of the front n-1 differential pressure sensors, and the convex column is fixedly connected with the inner wall of the lower edge of the negative locking connecting sleeve; during measurement, when the full range of the differential pressure sensor is reached, the locking of the differential pressure sensor is realized by limiting the convex column through the vertical sliding groove, and further the step-by-step locking of the front n-1 differential pressure sensors from bottom to top is realized.
The following description will be given by taking a second-order nesting as an example, and specifically referring to fig. 3 to 6, the description will be given by taking a low-order sensor 7 and a high-order sensor 8 as an example, where the range of the low-order sensor 7 is 0 to 1KPa, and the range of the high-order sensor is 1KPa to 1 MPa:
the low-order sensor 7 and the high-order sensor 8 are connected through an interlocking device, the interlocking device comprises a positive locking connecting sleeve 9A and a negative locking connecting sleeve 9B, the negative locking connecting sleeve 9B is arranged above the positive locking connecting sleeve 9A, a containing space for containing the low-order sensor 7 is formed between the positive locking connecting sleeve and the negative locking connecting sleeve, the high-order sensor 8 is positioned above the negative locking connecting sleeve, a first piston column table 9A1 is arranged in the positive locking connecting sleeve 9A, the first piston column table 9A1 is in sealing fit with the bottom inner side wall of a lower pressure cabin of the low-order sensor 7, a vertical sliding groove 9A2 is further formed in the circumferential direction of the outer side wall of the positive locking connecting sleeve, a convex column 71 matched with the vertical sliding groove 9A2 is further arranged in the circumferential direction of the low-order sensor 7, the convex column 71 can move up and down along the vertical sliding groove, the negative locking connecting sleeve 9, when the full range of the low-order sensor 7 is reached, the low-order differential pressure sensor is locked by matching with the locking connecting sleeve, so that the high-order range sensor 8 and the low-order range sensor 7 are interlocked, and the locking connecting sleeve 9A is also provided with a water inlet hole to provide a water inlet channel for a water permeable hole of an internal sensor wrapped by the locking connecting sleeve; in addition, in order to ensure the measurement accuracy, in this embodiment, the protruding column is fixedly connected with the lower edge inner wall of the back locking connection sleeve, that is, the back locking connection sleeve and the low-order sensor 7 are buckled in the vertical chute through the protruding column, the back locking connection sleeve, the protruding column and the low-order sensor are integrated and move relative to the vertical chute, when the back locking connection sleeve, the protruding column and the low-order sensor are in a locked state, the locked low-order sensor is effectively protected, and the situation that the locked sensor moves due to external thrust and influences the measurement result due to pressure change in the measurement process is avoided.
The top surface of the anti-lock connecting sleeve 9B is also provided with a water permeable hole and a second piston column table 9B1 for supporting a higher-order differential pressure sensor above the water permeable hole, the second piston column table 9B1 is in sealing fit with the inner side wall of the bottom of a lower pressure cabin of the high-order sensor 8 and reciprocates, the water permeable hole is used for keeping still water communication with the inner side wall of an upper pressure cavity, when the intensity of a measured sediment is in an interval of 0-1KPa, the measurement is carried out by adopting a low-order range sensor 7, and at the moment, the measurement precision is 1 Pa; when the strength of the measured sediment is in the range of 1KPa to 1MPa, the low-order range sensor is locked by the interlocking device after reaching the maximum measurement value, and the high-order range sensor performs measurement, wherein the measurement precision is 1 KPa.
In the scheme, by reducing the measurement range gradient of the sensor (for example, adopting two stages of 0-100MPa and 100MPa-10 KPa) and increasing the nesting order (such as nesting of 4 stages and 8 stages), as shown in fig. 11 and 12, a schematic diagram of a 5-stage nesting structure is shown. The most favorable data precision can be obtained according to the mechanical strength of the measured medium, the precision limit is theoretically not existed, the influence is only caused by the actual conditions of mechanical processing precision, structure integration efficiency and the like, when the sensor works specifically, the sensor has three states, namely an inactivated state, a working state and a locking state, as shown in figures 8-10, only one sensor is in the working state at any moment, and the convex column 71 slides up and down along with the pressure change in the vertical sliding groove 9A 2; the sensor of higher order than the working state is in the inactive state at this time, the convex column 71 is located at the top of the vertical chute; the sensor of lower order than the working state is in the locking state, and the convex column 71 reaches the bottom of the vertical sliding groove 9A2 along with the full range of pressure, and transmits the pressure to the sensor of the next order.
In addition, the length of the vertical sliding chute is specially designed, and the length of the vertical sliding chute is not more than the reliable deformation of the optical fiber of the differential pressure sensor matched with the vertical sliding chute; for example, assume a custom sensor with a span K and an optical fiber length LK(initial length), when the measured data reaches 120% K, the corresponding optical fiber length is Lk+MAX△Lk(length of extremum). Obviously, the reliable deformation of the optical fiber is MAX△LkIf the insurance coefficient is 90%, the length of the corresponding groove of the differential pressure sensor is 0.9MAX△Lk。
In addition, in order to ensure the measurement accuracy, in this embodiment, one end of the convex column is fixedly connected with the differential pressure sensor, and the other end of the convex column is fixedly connected with the lower edge inner wall of the back-locking connecting sleeve, that is, the back-locking connecting sleeve and the differential pressure sensor are buckled in the vertical chute through the convex column, the back-locking connecting sleeve, the convex column and the differential pressure sensor are integrated and move relative to the vertical chute, when the back-locking connecting sleeve is in a locking state, the locked differential pressure sensor is effectively protected, and the phenomenon that the locked sensor moves due to external thrust force caused by pressure change in the measurement process and the measurement result is influenced is avoided (whether the space size formed when the positive-locking connecting sleeve and the back-locking connecting sleeve are buckled is matched with the size of the sensor to be locked, and even if the convex column is not fixed with the back-locking.
The pressure difference sensor (7,8) in the scheme adopts a special design mode and comprises a shell, an upper pressure cavity 11 (hydrostatic pressure cavity), a lower pressure cavity 12 (dynamic pressure cavity), an elastic plastic film 13 and an optical fiber 6, wherein an upper pressure cabin water permeable hole 14 communicated with external hydrostatic water is arranged in the upper pressure cavity 11 to ensure that the upper pressure cavity is always hydrostatic pressure, and the elastic plastic film 13 is made of watertight elastic material and is arranged in the middle section in the pressure difference sensor to separate the upper pressure cavity from the lower pressure cavity; the optical fiber 6 penetrates through the upper pressure cavity and the lower pressure cavity, is fixedly connected with the elastic plastic film 13, and is sealed at the bottom of the lower pressure cavity in a sealing way through the first piston column base (or the second piston column base). The external water pressure pushes the first piston column (or the second piston column) to move upwards, so that the pressure of the lower pressure cavity rises, the elastic plastic film 13 is pushed to deform towards the upper pressure cavity, the optical fiber 6 is stretched to generate the change of the wavelength of the optical signal, and the deformation of the elastic plastic film, the pressure difference of the upper pressure cavity and the lower pressure cavity, the pressure of the lower pressure cavity and the pressure of the pressure piston can be sequentially and reversely calculated through the characteristics of the optical fiber and the change of the optical signal, and finally the external dynamic pressure is obtained. Of course, other fiber grating differential pressure sensors may be used, and are not limited in this regard.
Another significant advantage that this embodiment brings through a range nested interlock is the effective range protection of the sensor through the interlock: when the measured index reaches the range gradient, the high-order sensor can be activated through the interlocking device, the range of the sensor is locked, and as long as the range gradient is smaller than the optical fiber over-range damage limit (about 120%), the sensors except the highest-order sensor can be effectively protected in a range mode.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.
Claims (3)
1. Full sea depth self-adaptation high accuracy pressure conduction formula static cone penetration tapered probe based on FBG, including probe rod and CPT awl point, link to each other through the probe rod connector between probe rod and the CPT awl point, still be provided with buffering cushion and permeable stone between CPT awl point and the probe rod connector, its characterized in that:
a first-order differential pressure sensor, a second-order differential pressure sensor, … …, an n-1 th-order differential pressure sensor and an nth-order differential pressure sensor are sequentially arranged in the probe connector from bottom to top, wherein n is more than or equal to 2, the n differential pressure sensors are all differential pressure fiber grating sensors, the measuring ranges of the n differential pressure sensors are gradually increased from bottom to top, and adjacent differential pressure sensors are connected through an interlocking device; a super-pore pressure sensor is also arranged below the first-order differential pressure sensor, a lower cavity pore pressure passage of the super-pore pressure sensor is communicated with the permeable stone, and an upper cavity of the super-pore pressure sensor is abutted against the interlocking device to realize force transmission;
the interlocking device comprises a positive locking connecting sleeve and a negative locking connecting sleeve, the negative locking connecting sleeve is sleeved above the positive locking connecting sleeve, an accommodating space for accommodating the differential pressure sensor is formed between the positive locking connecting sleeve and the negative locking connecting sleeve, the front n-1-order differential pressure sensors are correspondingly arranged in the accommodating space matched with the positive locking connecting sleeve and the negative locking connecting sleeve, and the nth-order differential pressure sensor is positioned above the negative locking connecting sleeve; a first piston column base is arranged in the positive locking connecting sleeve, and the first piston column base is in sealing fit with the inner side wall of the bottom of a lower pressure chamber of the differential pressure sensor and reciprocates; a vertical sliding groove is further formed in the circumferential direction of the outer side wall of the positive locking connecting sleeve, a protruding column which is matched with the vertical sliding groove and can slide up and down along the vertical sliding groove is further arranged in the circumferential direction of the front n-1 differential pressure sensors, and the protruding column is fixedly connected with the lower edge of the inner wall of the reverse locking connecting sleeve.
2. The full-sea-depth adaptive high-precision pressure conduction type static cone penetration probe based on FBG (fiber Bragg Grating) as claimed in claim 1, is characterized in that: the length of the vertical sliding groove on the positive locking connecting sleeve is not more than the reliable deformation of the optical fiber of the differential pressure sensor matched with the vertical sliding groove.
3. The full-sea-depth adaptive high-precision pressure conduction type static cone penetration probe based on FBG (fiber Bragg Grating) as claimed in claim 1 or 2, is characterized in that: and the top surface of the back locking connecting sleeve is also provided with a water permeable hole and a second piston column base, and the second piston column base is in sealing fit with the inner side wall of the bottom of the lower pressure cabin of the nth-order differential pressure sensor and reciprocates.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116873170A (en) * | 2023-09-08 | 2023-10-13 | 山东科技大学 | Portable submarine hydrate exploration static sounding aircraft |
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| US6447342B1 (en) * | 2001-05-10 | 2002-09-10 | Delphi Technologies, Inc. | Pressure sensor connector |
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