CN105675119A - Low-frequency underwater piezoelectric detector - Google Patents
Low-frequency underwater piezoelectric detector Download PDFInfo
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- CN105675119A CN105675119A CN201610153463.0A CN201610153463A CN105675119A CN 105675119 A CN105675119 A CN 105675119A CN 201610153463 A CN201610153463 A CN 201610153463A CN 105675119 A CN105675119 A CN 105675119A
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- piezoelectric ceramic
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- 239000000919 ceramic Substances 0.000 claims abstract description 62
- 239000003292 glue Substances 0.000 claims abstract description 8
- 230000001681 protective effect Effects 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 238000004804 winding Methods 0.000 claims description 27
- 229920002635 polyurethane Polymers 0.000 claims description 7
- 239000004814 polyurethane Substances 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 239000004677 Nylon Substances 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- -1 phenol aldehyde Chemical class 0.000 claims description 3
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 claims description 3
- 229910052683 pyrite Inorganic materials 0.000 claims description 3
- 239000011028 pyrite Substances 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 12
- 239000000463 material Substances 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 5
- 239000013078 crystal Substances 0.000 description 3
- 229910000889 permalloy Inorganic materials 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000003921 oil Substances 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
- G01H11/08—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means using piezoelectric devices
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention discloses a low-frequency underwater piezoelectric detector, the detector comprises two resonance rings, two piezoelectric ceramic piece base plates are respectively adhered to two surfaces of each resonance ring, two piezoelectric ceramic pieces are respectively adhered to two surfaces of each piezoelectric ceramic piece base plate, output wires of piezoelectric ceramic piece combinations of four piezoelectric ceramic piece base plates are connected in parallel, a threading hole is arranged on each resonance ring, wires in the resonance rings passes through the threading holes, output wires of the piezoelectric ceramic piece combinations are connected with an input end of an output matcher, an output end of the output matcher is connected with a patch board, the patch board is connected with an output cable, the piezoelectric ceramic piece combinations are put in a protective jacket and are fixed by pouring entrant sound glue in, and an external protective shell is sleeved on the external of the protective jacket. Combination capacitance values of ceramic pieces are greatly increased, and a primary inductance value of the matcher is also greatly improved, so that a low-frequency underwater piezoelectric detector with resonant frequency less than 5Hz even 2Hz can be manufactured, and output sensitivity maximally can reach 38[mu]V/[mu]b.
Description
Technical field
The present invention is belonging to piezoelectric seismometer field under water, relates to a kind of low frequency piezoelectric seismometer under water.
Background technology
Piezoelectric seismometer under water, is also called " hydrophone ", offshore oil drilling and river, lake, marshland geological prospecting in there is purposes extremely widely. One important parameter of hydrophone is its resonant frequency, very low lower than the frequency band receiving sensitivity of its resonant frequency or can not normal received signal. In order to make hydrophone have broader working band, mainly needing to extend the frequency band of its low frequency end, its meaning is in that to accept the vibration wave that signal source more widely sends.
Such as, when the running speed of steamer or the electromotor of submarine is 6000 revs/min (running up), frequency of vibration is 100Hz; When the running speed of electromotor is 600 revs/min (low-speed running), frequency of vibration is 10Hz; When the running speed of electromotor is 300 revs/min (creep speed), frequency of vibration is 5Hz. When the resonant frequency of hydrophone is 10Hz, the frequency band signals of more than 10Hz can only be received, and can't accept the frequency band signals of below 10Hz. That is, when the running speed of steamer or the electromotor of submarine is higher than 600 revs/min, this hydrophone can receive its vibration signal; And when the running speed of steamer or the electromotor of submarine is lower than 600 revs/min, this hydrophone just can't accept its vibration signal.
The hydrophone can bought on domestic market is substantially 10Hz or more than 10Hz resonant frequency, oil exploration at sea or Marine Geology exploration industry are also the same, and they are desirable to apply the hydrophone with more low resonant frequency to obtain more rich geological exploration data.
Conventional passive hydrophone is all piezoelectric ceramic piece+adapter structure. Market mainstream hydrophone generally uses 4 potteries of two pieces of substrate stickings, and 4 potteries are generally adopted two string two modes. The capacitance of layered ceramic is typically in 20～40nF, then two string two and after combination capacitor value remain 20～40nF.Adapter is all use silicon steel sheet or permalloy EJ85 and EJ79 material as the E type transformator of magnetic core. These under water piezoelectric seismometer resonant frequency both be greater than or equal to 10Hz, output sensitivity is up to 14 μ V/ μ about b.
By theory analysis and actual experiment it can be seen that two most important factor affecting hydrophone resonant frequency are the primary electrical sensibility reciprocals of the capacitance of potsherd and output matching device. That is to reduce the resonant frequency of hydrophone, it is necessary to increase the total capacitance of piezoelectric ceramic piece and improve the primary electrical sensibility reciprocal of output matching device.
Summary of the invention
The present invention is to solve above-mentioned technical problem, it is provided that a kind of low frequency piezoelectric seismometer under water, be added significantly to the combination capacitor value of potsherd; And the primary electrical sensibility reciprocal of adapter is greatly improved, it is thus possible to produce resonant frequency lower than 5Hz, even up to the low frequency piezoelectric seismometer under water of 2Hz, output sensitivity can reach 38 μ V/ μ b simultaneously.
The present invention is achieved through the following technical solutions:
A kind of low frequency piezoelectric seismometer under water, including two resonance loops, a piezoelectric ceramics plate base is pasted on the two sides of every resonance loop, piezoelectric ceramic piece is all pasted on the two sides of each piezoelectric ceramics plate base, connect for parallel way between the output lead of the piezoelectric ceramic piece combination on four piezoelectric ceramics plate bases, resonance loop offers cable-through hole, resonance loop inner lead passes from cable-through hole, the output lead of piezoelectric ceramic piece combination is connected with output matching device input, the outfan of output matching device is connected to patchboard, patchboard connects output cable, the piezoelectric ceramic piece connected combination is put in sheath, fill entrant sound glue to fix, outer protecting shell it is set with outside sheath.
Piezoelectric ceramic piece is pasted by just negative, positive plus or minus negative direction respectively in the two sides of described each piezoelectric ceramics plate base.
Described piezoelectric ceramic piece monolithic capacitance is 130～180nF.
It is cylindric as magnetic core that described output matching device adopts ultracrystallite strip coil to make, additional plastics protective case.
Described output matching device includes adapter armature winding, adapter secondary windings and adapter magnetic core, and the output lead of piezoelectric ceramic piece combination is connected with the adapter armature winding of output matching device, and the adapter secondary windings of output matching device is connected to patchboard.
Described adapter armature winding, with 6 enamel-covered wire coiling 20000 circles, adapter secondary windings, with 10 enamel-covered wire coiling 3200 circles.
Inside sheath, fill entrant sound polyurethane adhesive, and form the afterbody of sheath.
Described piezoelectric ceramics plate base adopts parelinvar to make, resonance loop adopts pyrite HP59 to make, and patchboard adopts phenol aldehyde laminated cloth board to make, and sheath adopts entrant sound polyurethane to make, outer protecting shell adopts the modified nylon that strengthens to make, and output cable is the glue two core cable that blocks water.
The diameter 1mm of described cable-through hole, calibration 180 °.
Compared with prior art, the present invention has following useful technique effect:
The present invention is widely used in the aspects such as Marine Geology exploration and ocean early warning. It is the low frequency high sensitivity low frequency piezoelectric seismometer under water that the impedance output matching device that connection in series-parallel combination and high permeability materials by many piezoelectric ceramic pieces are made forms. Its 4 strings 2 using 8 high-capacitance piezoelectric ceramic pieces structure are to be significantly increased the combination capacitor value of potsherd; Ultracrystallite strip coil is adopted to make the cylindric double winding output matching device as magnetic core so that the primary electrical sensibility reciprocal of adapter is greatly improved, it is thus possible to produce resonant frequency lower than 5Hz, even up to the low frequency piezoelectric seismometer under water of 2Hz, output sensitivity can reach 38 μ V/ μ b simultaneously.
Output matching device used in the present invention adopts cylindrical shape Superfine crystal material as magnetic core, coordinates high number of turns, and what make that primary inductance does is significantly high. The inductance value of capacitance and adapter by regulating potsherd, can accomplish below 5Hz by the resonant frequency of low frequency piezoelectric seismometer under water, it might even be possible to reach 2Hz. The inductance value of capacitance and adapter by selecting potsherd, makes output sensitivity can reach 14～38 μ V/ μ b, and by selecting the secondary electrical sensibility reciprocal of adapter, makes output impedance less than 4K Ω.
Accompanying drawing explanation
Fig. 1 is the low frequency piezoelectric seismometer practical structures figure under water of the embodiment of the present invention.
The embodiment internal main that Fig. 2 is the present invention wants structural representation.
Fig. 3 is the low frequency piezoelectric seismometer equivalent circuit under water of the embodiment of the present invention.
Fig. 4 is the resonance loop of the embodiment of the present invention.
Wherein, 1 is piezoelectric ceramics plate base; 2 is piezoelectric ceramic piece; 3 is output matching device; 4 is adapter armature winding; 5 is adapter secondary windings; 6 is adapter magnetic core; 7 is resonance loop; 8 is cable-through hole; 9 is patchboard; 10 is sheath; 11 is outer protecting shell; 12 is output cable.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in further detail, and the explanation of the invention is not limited.
It is example with regard to the embodiment of the present invention below, illustrates with reference to accompanying drawing 1----Fig. 4.
Referring to Fig. 1 to Fig. 4, a kind of low frequency piezoelectric seismometer under water, including two resonance loops 7, a piezoelectric ceramics plate base 1 is pasted on the two sides of every resonance loop 7, piezoelectric ceramic piece 2 is all pasted on the two sides of each piezoelectric ceramics plate base 1, connect for parallel way between the output lead of piezoelectric ceramic piece 2 combination on four piezoelectric ceramics plate bases 1, resonance loop 7 offers cable-through hole 8, resonance loop 7 inner lead passes from cable-through hole 8, the output lead of piezoelectric ceramic piece 2 combination is connected with output matching device 3 input, the outfan of output matching device 3 is connected to patchboard 9, patchboard 9 connects output cable 12, the piezoelectric ceramic piece 2 connected combination is put in sheath 10, fill entrant sound glue to fix, outer protecting shell 11 it is set with outside sheath.
Piezoelectric ceramic piece 2 is pasted by just negative, positive plus or minus negative direction respectively in the two sides of described each piezoelectric ceramics plate base 1.
Described piezoelectric ceramic piece 2 monolithic capacitance is 130～180nF.
It is cylindric as magnetic core, double winding that described output matching device 3 adopts ultracrystallite strip coil to make, and the outside of magnetic core adds plastics protective case, then coiling on plastics protective case again.
Described output matching device 3 includes adapter armature winding 4, adapter secondary windings 5 and adapter magnetic core 6, the output lead of piezoelectric ceramic piece 2 combination is connected with the adapter armature winding 4 of output matching device 3, and the adapter secondary windings 5 of output matching device 3 is connected to patchboard 9.
Described adapter armature winding, with 6 enamel-covered wire coiling 20000 circles, adapter secondary windings, with 10 enamel-covered wire coiling 3200 circles.
Inside sheath 10, fill entrant sound polyurethane adhesive, and form the afterbody of sheath.
Described piezoelectric ceramics plate base 1 adopts parelinvar beryllium-bronze to make, resonance loop 7 adopts pyrite HP59 to make, and patchboard 9 adopts phenol aldehyde laminated cloth board to make, and sheath 10 adopts entrant sound polyurethane to make, outer protecting shell 11 adopts the modified nylon that strengthens to make, and output cable 12 is the glue two core cable that blocks water.
The diameter 1mm of described cable-through hole 8, calibration 180 °.
Concrete, a kind of low frequency piezoelectric seismometer under water, use 2 resonance loops 7, piezoelectric ceramics plate base 1 is pasted on its two sides, piezoelectric ceramics plate base 1 totally 4, piezoelectric ceramic piece 2 is pasted by positive negative direction in the two sides of piezoelectric ceramics plate base 1, and piezoelectric ceramic piece 2 is totally 8 potteries. It should be noted that piezoelectric ceramic piece 2 can also be pasted by positive plus or minus negative direction, it is only necessary to correspondingly changing the connection of output connecting line, connect output lead by Fig. 2 mode, resonance loop inner lead passes from cable-through hole 8.
This embodiment adopts piezoelectric ceramic piece monolithic capacitance to be 130～180nF, shares 8 potteries, and 8 potteries adopt two string four modes, then combination capacitor value reaches 260～360nF, as shown in Figure 3. Capacitance is more high, is more conducive to the reduction of output impedance.
Sheath 10 is put in the piezoelectric ceramic piece connected combination, fills entrant sound glue and fix.
The output lead combine piezoelectric ceramic piece and the armature winding 4 of output matching device 3 connect. The secondary windings 5 of output matching device 3 is connected to patchboard 9. Output cable 12 is also connected to patchboard 9.
The output matching device 3 that this embodiment uses adopts cylindrical shape Superfine crystal material as magnetic core 6, double winding, and its permeability is high, is much better than stalloy or permalloy, and the leakage field of cirque structure is few. Number of turns very easily just can reach more than 25000 circles. So the primary inductance of output matching device can do significantly high. And the output matching device of routine low frequency piezoelectric seismometer under water uses E type stalloy or E type permalloy as magnetic core, and its armature winding is subject to volumetric constraint, and it is not high that the number of turn very difficult breakthrough 10000 circles make its inductance value do.
After output matching device 3 and patchboard 9 are put into sheath 10, fill entrant sound polyurethane adhesive at sheath 10 inner utilization mould, and form the afterbody of sheath 10.
Outer protecting shell 11 it is set with outside sheath.
Installation, as shown in Figure 1.
The inductance value of this embodiment capacitance and adapter by selecting potsherd, the resonant frequency making low frequency piezoelectric seismometer under water is 5Hz, and output sensitivity reaches 28 μ V/ μ b, and output impedance is 3.8K Ω.
Further experiments show that the resonant frequency of low frequency piezoelectric seismometer under water can be accomplished below 5Hz, it might even be possible to reach 2Hz by the inductance value of capacitance and adapter by regulating potsherd. Output sensitivity can reach 14～38 μ V/ μ b, and export impedance and still can reach below 4K Ω.
The present invention is widely used in the aspects such as Marine Geology exploration and ocean early warning. It is the low frequency high sensitivity low frequency piezoelectric seismometer under water that the impedance output matching device that connection in series-parallel combination and high permeability materials by many piezoelectric ceramic pieces are made forms. Its 4 strings 2 using 8 high-capacitance piezoelectric ceramic pieces structure are to be significantly increased the combination capacitor value of potsherd; Ultracrystallite strip coil is adopted to make the cylindric double winding output matching device as magnetic core so that the primary electrical sensibility reciprocal of adapter is greatly improved, it is thus possible to produce resonant frequency lower than 5Hz, even up to the low frequency piezoelectric seismometer under water of 2Hz, output sensitivity can reach 38 μ V/ μ b simultaneously.
Output matching device used in the present invention adopts cylindrical shape Superfine crystal material as magnetic core, coordinates high number of turns, and what make that primary inductance does is significantly high. The inductance value of capacitance and adapter by regulating potsherd, can accomplish below 5Hz by the resonant frequency of low frequency piezoelectric seismometer under water, it might even be possible to reach 2Hz.The inductance value of capacitance and adapter by selecting potsherd, makes output sensitivity can reach 14～38 μ V/ μ b, and by selecting the secondary electrical sensibility reciprocal of adapter, makes output impedance less than 4K Ω.
The ultimate principle of the present invention and principal character and advantages of the present invention have more than been shown and described. Skilled person will appreciate that of the industry; the present invention is not restricted to the described embodiments; described in above-described embodiment and description is that principles of the invention is described; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements both fall within the claimed scope of the invention. Claimed scope is defined by appending claims and equivalent thereof.
Claims (9)
1. a low frequency piezoelectric seismometer under water, it is characterized in that, including two resonance loops (7), a piezoelectric ceramics plate base (1) is pasted on the two sides of every resonance loop (7), piezoelectric ceramic piece (2) is all pasted on the two sides of each piezoelectric ceramics plate base (1), connect for parallel way between the output lead that piezoelectric ceramic piece (2) on four piezoelectric ceramics plate bases (1) combines, resonance loop (7) offers cable-through hole (8), resonance loop (7) inner lead passes from cable-through hole (8), the output lead that piezoelectric ceramic piece (2) combines is connected with output matching device (3) input, the outfan of output matching device (3) is connected to patchboard (9), patchboard (9) connects output cable (12), the piezoelectric ceramic piece (2) connected combination is put in sheath (10), fill entrant sound glue to fix, outer protecting shell (11) it is set with outside sheath.
2. low frequency according to claim 1 piezoelectric seismometer under water, it is characterised in that piezoelectric ceramic piece (2) is pasted by just negative, positive plus or minus negative direction respectively in the two sides of described each piezoelectric ceramics plate base (1).
3. low frequency according to claim 1 piezoelectric seismometer under water, it is characterised in that described piezoelectric ceramic piece (2) monolithic capacitance is 130～180nF.
4. low frequency according to claim 1 piezoelectric seismometer under water, it is characterised in that it is cylindric as magnetic core that described output matching device (3) adopts ultracrystallite strip coil to make, additional plastics protective case.
5. the piezoelectric seismometer under water of the low frequency according to claim 1 or 4, it is characterized in that, described output matching device (3) includes adapter armature winding (4), adapter secondary windings (5) and adapter magnetic core (6), the output lead that piezoelectric ceramic piece (2) combines is connected with the adapter armature winding (4) of output matching device (3), and the adapter secondary windings (5) of output matching device (3) is connected to patchboard (9).
6. low frequency according to claim 5 piezoelectric seismometer under water, it is characterised in that described adapter armature winding, with 6 enamel-covered wire coiling 20000 circles, adapter secondary windings, with 10 enamel-covered wire coiling 3200 circles.
7. low frequency according to claim 1 piezoelectric seismometer under water, it is characterised in that at sheath (10) internal filling entrant sound polyurethane adhesive, and form the afterbody of sheath.
8. low frequency according to claim 1 piezoelectric seismometer under water, it is characterized in that, described piezoelectric ceramics plate base (1) adopts parelinvar to make, resonance loop (7) adopts pyrite HP59 to make, patchboard (9) adopts phenol aldehyde laminated cloth board to make, sheath (10) adopts entrant sound polyurethane to make, and outer protecting shell (11) adopts the modified nylon that strengthens to make, and output cable (12) is the glue two core cable that blocks water.
9. low frequency according to claim 1 piezoelectric seismometer under water, it is characterised in that the diameter 1mm of described cable-through hole (8), calibration 180 °.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610153463.0A CN105675119A (en) | 2016-03-17 | 2016-03-17 | Low-frequency underwater piezoelectric detector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610153463.0A CN105675119A (en) | 2016-03-17 | 2016-03-17 | Low-frequency underwater piezoelectric detector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106094036A (en) * | 2016-07-16 | 2016-11-09 | 北京捷威思特科技有限公司 | Piezoelectric type vertical seismic logging instrument and logging method |
| CN107631791A (en) * | 2017-08-07 | 2018-01-26 | 国家电网公司 | A kind of sensor for monitoring oil-filled transformer noise |
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| EP2975432A1 (en) * | 2014-07-11 | 2016-01-20 | Istanbul Universitesi Teknoloji Transfer Uygulama ve Arastirma Merkezi | Low cost hydrophone |
| CN205426327U (en) * | 2016-03-17 | 2016-08-03 | 西安陆洲智能传感技术有限公司 | Low frequency is piezoelectric seismometer under water |
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2016
- 2016-03-17 CN CN201610153463.0A patent/CN105675119A/en active Pending
Patent Citations (7)
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| CN1601302A (en) * | 2004-06-28 | 2005-03-30 | 陕西超波传感器有限责任公司 | Novel composite earthquake demodulator |
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| CN2793751Y (en) * | 2005-05-20 | 2006-07-05 | 中国石油天然气集团公司 | Piezoelectric demodulator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106094036A (en) * | 2016-07-16 | 2016-11-09 | 北京捷威思特科技有限公司 | Piezoelectric type vertical seismic logging instrument and logging method |
| CN107631791A (en) * | 2017-08-07 | 2018-01-26 | 国家电网公司 | A kind of sensor for monitoring oil-filled transformer noise |
| CN107631791B (en) * | 2017-08-07 | 2019-09-10 | 国家电网公司 | A kind of sensor monitoring oil-immersed transformer noise |
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Application publication date: 20160615 |