CN210427820U

CN210427820U - Novel underwater MEMS double-detection detector

Info

Publication number: CN210427820U
Application number: CN201921154978.8U
Authority: CN
Inventors: 杨德宽; 马永良; 徐美辉; 强明明; 王春田; 徐钰; 崔汝国; 时兴文
Original assignee: China Petrochemical Corp; Sinopec Oilfield Service Corp; Sinopec Petroleum Engineering Geophysics Co Ltd; Sinopec Petroleum Engineering Geophysics Co Ltd Shengli Branch
Current assignee: China Petrochemical Corp; Sinopec Oilfield Service Corp; Sinopec Petroleum Engineering Geophysics Co Ltd; Sinopec Petroleum Engineering Geophysics Co Ltd Shengli Branch
Priority date: 2019-07-22
Filing date: 2019-07-22
Publication date: 2020-04-28
Anticipated expiration: 2029-07-22

Abstract

The utility model provides a novel underwater MEMS double-detection detector, including the MEMS detector, the hydrophone, battery compartment and detector plug, this hydrophone receives the underwater acoustic signal, and give this MEMS detector with the underwater acoustic signal transmission, the MEMS detector receives land seismic wave data, this MEMS detector is connected in this hydrophone, and give this battery compartment with underwater acoustic signal and land seismic wave signal transmission, the one end of this battery compartment is connected in this MEMS detector, the other end is connected in this detector plug, for this MEMS detector and this hydrophone power supply, and transmit the acquisition cable with this detector plug connection with underwater acoustic signal and land seismic wave signal through this detector plug. The novel underwater MEMS double-detection detector is high in sensitivity, strong in reliability and better in consistency, and the problem that 90-degree phase difference exists in output signals generated by inconsistent receiving principles of the detectors in the traditional double detection is solved.

Description

Novel underwater MEMS double-detection detector

Technical Field

The utility model relates to a geophysical exploration and development technical field especially involves a novel detector is examined to MEMS double detector under water.

Background

At the end of the 20 th century and the 80 th century, a method for suppressing multiple waves such as water layer reverberation, sound shock and the like by using a double-detection detector in Ocean OBC (Ocean bottom cable, OBC for short) seismic exploration is proposed, the principle of the method is that the interference of the multiple waves of submarine exploration is removed by using a double-detection receiving technology, and the method performs optimal proportion summation on pressure detector data and speed detector data by using the difference of the characteristics such as polarity, amplitude, frequency and the like of the pressure detector and the speed detector to achieve the purpose of suppressing ghost reflection and sea water sound shock, so that oil-gas exploration and geological tasks are completed with high precision. Its presence provides a technical means of acquiring high quality seismic data for shallow water and barrier areas where seismic streamers cannot be constructed.

At present, the OBC double detection is most widely applied by matching a moving-coil velocity detector with a piezoelectric hydrophone to complete double detection information receiving. The high-sensitivity magnetoelectric detector and the ocean piezoelectric detector are combined into a whole, namely, two receiving devices, namely a land detection detector and a water detection detector, are combined together. The conventional double-detection detector is formed by combining 2 moving coil detectors and a common hydrophone, and is low in sensitivity and low in signal-to-noise ratio. Aiming at the defects of a moving coil detector in modern marine exploration and the continuous development of piezoelectric materials and MEMS (Micro Electro Mechanical Systems) technology, the MEMS detector is supposed to replace the moving coil detector and form a novel underwater MEMS double-detection detector together with a high-sensitivity low-frequency hydrophone. The MEMS detector is a digital detector manufactured by using MEMS technology abroad by using MEMS technology, and is widely applied to exploration, and most of detectors used in ocean OBC exploration are still analog detectors at present. Therefore, a novel underwater MEMS double-detection detector is invented, and the technical problems are solved.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a sensitivity is high, the good reliability, and the uniformity is also better, has eliminated traditional two examines because of the wave detector receives the inconsistent problem that produces output signal and have 90 phase differences's novel detector of examining of MEMS under water of principle.

The purpose of the utility model can be realized by the following technical measures: novel hydrophone is examined doubly to MEMS under water, this novel geophone is examined doubly to MEMS under water includes the MEMS geophone, the hydrophone, battery compartment and geophone plug, this hydrophone receives the underwater acoustic signal, and give this MEMS geophone with the underwater acoustic signal transmission, this MEMS geophone is connected in this hydrophone, the MEMS geophone receives land seismic wave signal, and give this battery compartment with underwater acoustic signal and land seismic wave signal transmission, the one end of this battery compartment is connected in this MEMS geophone, the other end is connected in this geophone plug, for this MEMS geophone and this hydrophone power supply, and with the acquisition cable of underwater acoustic signal and land seismic wave signal transmission through this geophone plug to being connected with this geophone plug.

The purpose of the utility model can be realized by the following technical measures:

the novel underwater MEMS double-detection detector further comprises an outer protective shell, and the MEMS detector, the hydrophone and the battery bin are all located in the outer protective shell.

The outer protecting shell is divided into an upper protecting shell and a lower protecting shell, the upper protecting shell and the lower protecting shell are connected through screws, round holes are reserved in the corresponding positions of the hydrophone, underwater acoustic signals can be conveniently received, and the whole outer protecting shell is flat.

The MEMS detector comprises an MEMS detector circuit board, a universal ship, two bearings, a bearing support and a double-detection outer cylinder, wherein the MEMS detector circuit board is fixed on the universal ship through screws, the two bearings are installed at the two ends of the universal ship, and the two bearings are fixed on the double-detection outer cylinder through the bearing support.

The MEMS detector also comprises a slip ring and a waterproof plug, wherein a signal line and a power line of the MEMS detector circuit board are connected with the waterproof plug through the slip ring, and the waterproof plug is connected with the battery bin.

The MEMS detector also comprises a sealing plug and a sealing plug, wherein the sealing plug is connected to the sealing plug, so that the interior of the MEMS detector is sealed and waterproof.

This hydrophone includes hydrophone piezoceramics, hydrophone ceramic support, hydrophone polyurethane sheath, charge amplifier and vulcanization layer, this hydrophone piezoceramics installs on this hydrophone ceramic support, make this hydrophone piezoceramics form a cavity structure through this hydrophone ceramic support, this hydrophone piezoceramics and this hydrophone ceramic support are packed into in this hydrophone polyurethane sheath, use polyurethane rubber to carry out the embedment, and be connected with this two urceolus of examining through this vulcanization layer, this charge amplifier carries out impedance matching with the output of this hydrophone, this charge amplifier is connected with hydrophone piezoceramics, and give this MEMS wave detector with the hydrophone signal transmission.

The piezoelectric ceramics of the hydrophone adopt PZT-5 series piezoelectric ceramics.

This battery compartment includes lithium cell and lithium cell fixing base, and this lithium cell passes through this lithium cell fixing base to be installed in this battery compartment.

The detector plug is a standard four-core waterproof connector.

The utility model provides a novel two detectors of examining of MEMS under water involves the geophone of marine exploration collection usefulness, uses ripe MEMS technique to produce analog output's two ripples of examining, compares in the moving coil wave detector, and MEMS wave detector sensitivity is high, the good reliability, and the uniformity is also better. Meanwhile, since the water detection and the land detection are acceleration signals, the problem that the output signals have 90-degree phase difference due to inconsistent receiving principles of the detectors in the traditional double detection is solved. The MEMS technology is introduced into OBC exploration to replace a traditional moving coil detector, and a charge amplifier is used for replacing a transformer to perform impedance matching in a water detection part, so that the method is a new attempt and is a development direction of a double-detection detector. It has the following advantages:

1. the land detection sensitivity and the water detection sensitivity are higher, and the consistency is better;

2. the land detection and the water detection have stronger low-frequency end receiving capability;

3. the signal types are consistent, no 90-degree phase difference exists, and the consistency of the signals in data processing is ensured;

4. the slip ring replaces a conducting strip, so that the reliability is higher and the installation is more convenient.

Drawings

Fig. 1 is a structural diagram of an embodiment of the novel underwater MEMS dual detector of the present invention;

fig. 2 is a schematic structural diagram of a MEMS detector and a hydrophone according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a battery compartment according to an embodiment of the present invention.

The reference numerals in the drawings are explained as follows:

1-MEMS detector, 2-hydrophone, 3-battery chamber, 4-outer protecting shell, 5-detector plug and 6-hydrophone ceramic support; 7-hydrophone piezoelectric ceramic, 8-hydrophone polyurethane sheath, 9-charge amplifier, 10-vulcanized layer and 11-bearing support; 12-bearing, 13-universal ship, 14-MEMS detector circuit board, 15-slip ring, 16-double detection outer cylinder, 17-sealing plug, 18-sealing plug, 19-waterproof plug, 20-lithium battery and 21-lithium battery fixing seat

Detailed Description

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

The novel underwater MEMS double-detection detector mainly comprises an MEMS land detection part and a high-sensitivity low-frequency hydrophone; the circuit board of the MEMS land inspection part is arranged on the single universal frame, and a power supply and a signal wire of the MEMS detector on the universal frame are led out through the slip ring, so that the reliability is higher and the installation is simpler and more convenient compared with a conducting strip lead mode of double inspection of a moving coil. The high-sensitivity low-frequency hydrophone of the water detection part mainly comprises a piezoelectric unit, a charge amplifier and a polyurethane sheath. Compared with the conventional double detection, the method has the advantages that the charge amplifier is used for replacing a transformer to carry out coupling and impedance matching, the method is convenient to debug, the output impedance is low, the transmission efficiency is higher, and the consistency is better guaranteed.

The product adopts the lithium cell of large capacity to supply power, and it is more convenient in order to change the battery, and the special battery compartment of lithium cell part design has, and with the partial separation of wave detector, battery and wave detector two parts are adorned in a platykurtic shell jointly.

As shown in fig. 1, fig. 1 is a structural diagram of the novel underwater MEMS dual detector of the present invention. The double-detection geophone is a geophone which is used for recording land seismic wave data and water seismic wave data by using a land detection geophone and a hydrophone at the same physical point, the novel underwater MEMS double-detection geophone comprises an MEMS geophone 1, a hydrophone 2, a battery compartment 3, an outer protective shell 4 and a geophone plug 5, wherein the MEMS geophone 1 and the hydrophone 2 serve as one unit of the novel underwater MEMS double-detection geophone, the battery compartment 3 serves as the other unit, and the two units are connected through a waterproof cable. The two units are jointly arranged in an outer protective shell 4, and the signal of the final detector is output through a detector plug 5 on the battery bin 3 and is connected with a collecting instrument.

The hydrophone 2 receives the underwater acoustic signals and transmits the underwater acoustic signals to the MEMS geophone 1, and the MEMS geophone 1 is connected to the hydrophone 2, receives the land seismic wave signals and transmits the underwater acoustic signals and the land seismic wave signals to the battery bin 3. One end of the battery bin 3 is connected with the MEMS detector 1, the other end of the battery bin is connected with the detector plug 5, power is supplied to the MEMS detector 1 and the hydrophone 2, and the underwater acoustic signals and the land seismic signals are transmitted to the collecting cable externally connected with the detector plug 5 through the detector plug 5.

The MEMS detector 1 comprises an MEMS detector circuit board 14, a universal ship 13, a bearing 12, a bearing bracket 11, a slip ring 15, a double-detection outer cylinder 16, a sealing plug 17, a sealing plug 18 and a waterproof plug 19; in order to solve the problem of directionality of an MEMS detector when the MEMS detector is arranged on the seabed, namely, the Z axis of an MEMS chip is required to be always vertical to the ground, a universal structure is designed, 13 in figure 2 is a universal ship, an MEMS detector circuit board 14 is fixed on the universal ship 13 through screws, the universal ship 13 is placed in silicon oil to provide proper damping for the detector, two bearings 12 are arranged at two ends of the universal ship 13, and the bearings 12 are fixed in a double-detection outer cylinder 16 through bearing supports 11; the signal and power lines of the MEMS detector circuit board 14 are connected to a waterproof plug 19 via a slip ring 15. The adoption of the standard slip ring can ensure the flexibility of rotation and the reliability of lead connection. A waterproof plug 19 is attached to the battery compartment 3. The MEMS detector also comprises a sealing plug 17 and a sealing plug 18, wherein the sealing plug 17 and the sealing plug 18 ensure that the interior of the MEMS detector is sealed and waterproof.

The hydrophone 2 comprises a hydrophone piezoelectric ceramic 7, a hydrophone ceramic support 6, a hydrophone polyurethane sheath 8, a charge amplifier 9 and a vulcanized layer 10; the piezoelectric ceramic 7 of the hydrophone adopts PZT-5 series piezoelectric ceramic, the PZT-5 series piezoelectric ceramic has very high electromechanical coupling coefficient and piezoelectric strain constant, and each electromechanical parameter has excellent time and temperature stability, so the piezoelectric ceramic is commonly used for manufacturing the hydrophone. The hydrophone piezoelectric ceramic 7 is arranged on the hydrophone ceramic support 6, and the piezoelectric ceramic 7 forms a cavity structure through the hydrophone ceramic support 6 so as to be convenient for receiving underwater acoustic signals. After the hydrophone piezoelectric ceramic 7 and the hydrophone ceramic support 6 are assembled into a unit, the unit is filled into a hydrophone polyurethane sheath 8, encapsulated by polyurethane rubber, and connected with a double-detection outer cylinder 16 through a vulcanized layer 10. The charge amplifier 9 is connected with the piezoelectric ceramic 7 of the hydrophone.

The polyurethane material not only has good sealing performance and seawater corrosion resistance, but also has good sound transmission performance, can transmit pressure to the piezoelectric ceramic sensitive element to the maximum extent, prevents attenuation of sound waves, and is beneficial to receiving of hydrophones. The charge amplifier 9 is used for impedance matching of the output of the hydrophone, because the impedance of the array of piezoelectric ceramics is very large, the transmission efficiency is very low, therefore, impedance matching is needed to be carried out after the piezoelectric ceramics is output, and the traditional double-detection detector can be connected with a collection instrument, the impedance matching is carried out by using a transformer, the output sensitivity of the hydrophone is also reduced while the impedance is reduced by the mode, the problem that the charge amplifier 9 cannot be adopted is solved, in addition, when the production debugging is carried out, different coil turns are wound by using the transformer according to the output of each group of piezoelectric ceramics, the process is very complicated, only the corresponding resistance capacitance value needs to be changed by using the charge amplifier, and the operation is very convenient.

The battery compartment 3 comprises a lithium battery 20 and a lithium battery fixing seat 21; the lithium battery 20 is installed in the battery compartment 3 through a battery fixing seat 21, one end of the battery compartment 3 is connected with the MEMS detector 1 and the hydrophone 2, power is supplied to an MEMS detector circuit board 14 and a charge amplifier 9 of the hydrophone, meanwhile, output signals of the MEMS detector and the hydrophone are led into the battery compartment 3, and finally the two paths of signals are connected with a detector plug 5 at the other end of the battery compartment 3 and are connected with a collecting cable through the detector plug 5.

The outer protective shell 4 is composed of an upper sheet and a lower sheet, and the upper sheet and the lower sheet are buckled together and connected by screws when in use. The outer protective shell 4 is used for assembling the MMES detector 1, the hydrophone 2 and the battery bin 3 into a whole, meanwhile, the hydrophone 2 is protected, and round holes are reserved in the corresponding positions of the hydrophone 2 on the outer protective shell 4, so that underwater acoustic signals can be conveniently received. The overall appearance of the outer protective shell 4 is designed to be flat, so that the MEMS detector 1 can be better coupled with the ground, and the receiving of vibration signals is facilitated.

The detector plug 5 is a standard four-core waterproof connector commonly used for geophysical prospecting and can be directly connected with a collecting cable.

The utility model discloses replace the moving coil wave detector in traditional two inspections with MEMS simulation wave detector, it is weak to have solved the current moving coil wave detector low frequency response ability in two inspections, the uniformity is poor, the little problem of sensitivity, simultaneously, the high sensitivity low frequency hydrophone is chooseed for use in the aspect of the water inspection to charge amplifier replaces the transformer coupling mode that uses before, has ensured no matter water examines the land detection in the aspect of sensitivity and all reaches the two times that traditional two inspections, has broken through the development bottleneck of traditional two inspection wave detectors.

Claims

1. Novel hydrophone is examined doubly to MEMS under water, a serial communication port, this novel geophone is examined doubly to MEMS under water includes the MEMS geophone, the hydrophone, battery compartment and geophone plug, this hydrophone receives the hydroacoustic signal, and give this MEMS geophone with the hydroacoustic signal transmission, this MEMS geophone is connected in this hydrophone, the MEMS geophone receives land seismic wave signal, and give this battery compartment with hydroacoustic signal and land seismic wave signal transmission, the one end of this battery compartment is connected in this MEMS geophone, the other end is connected in this geophone plug, for this MEMS geophone and this hydrophone power supply, and with the hydroacoustic signal and land seismic wave signal through this geophone plug transmission to the collection cable with this geophone plug connection.

2. The novel underwater MEMS dual-detection geophone according to claim 1, further comprising an outer casing, wherein the MEMS geophone, the hydrophone and the battery compartment are all located in the outer casing.

3. The novel underwater MEMS double-detector according to claim 2, wherein the outer protective casing is composed of an upper piece and a lower piece which are connected through screws, round holes are reserved at corresponding positions of the hydrophone for receiving underwater acoustic signals, and the outer protective casing is flat.

4. The novel underwater MEMS double-detection detector as claimed in claim 1, wherein the MEMS detector comprises an MEMS detector circuit board, a universal ship, two bearings, a bearing support and a double-detection outer cylinder, the MEMS detector circuit board is fixed on the universal ship by screws, the two bearings are installed at two ends of the universal ship, and the two bearings are fixed on the double-detection outer cylinder through the bearing support.

5. The novel underwater MEMS double-detection detector as claimed in claim 4, wherein the MEMS detector further comprises a slip ring and a waterproof plug, the signal line and the power line of the MEMS detector circuit board are connected with the waterproof plug through the slip ring, and the waterproof plug is connected with the battery compartment.

6. The novel underwater MEMS double-detector as claimed in claim 4, wherein the MEMS detector further comprises a sealing plug and a sealing plug, the sealing plug is connected to the sealing plug, so that the interior of the MEMS detector is sealed and waterproof.

7. The hydrophone of claim 4, wherein the hydrophone comprises a hydrophone piezoelectric ceramic, a hydrophone ceramic support, a hydrophone polyurethane sheath, a charge amplifier and a vulcanized layer, wherein the hydrophone piezoelectric ceramic is mounted on the hydrophone ceramic support, the hydrophone piezoelectric ceramic is formed into a cavity structure by the hydrophone ceramic support, the hydrophone piezoelectric ceramic and the hydrophone ceramic support are encased in the hydrophone polyurethane sheath, encapsulated with polyurethane rubber and connected to the double-detection outer cylinder through the vulcanized layer, the charge amplifier is connected to the hydrophone piezoelectric ceramic, and the charge amplifier is impedance-matched to the output of the hydrophone and transmits the hydrophone signal to the MEMS hydrophone.

8. The novel underwater MEMS dual-detector as recited in claim 7, wherein the hydrophone piezoelectric ceramic is PZT-5 series piezoelectric ceramic.

9. The novel underwater MEMS double-detection detector as claimed in claim 1, wherein the battery compartment comprises a lithium battery and a lithium battery fixing seat, and the lithium battery is installed in the battery compartment through the lithium battery fixing seat.

10. The novel underwater MEMS dual detector as recited in claim 1, wherein the detector plug is a standard four-core waterproof connector.