CN106198719B - A kind of underwater conducting material structure object defect alternating current field measurement instrument - Google Patents
A kind of underwater conducting material structure object defect alternating current field measurement instrument Download PDFInfo
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- CN106198719B CN106198719B CN201610826149.4A CN201610826149A CN106198719B CN 106198719 B CN106198719 B CN 106198719B CN 201610826149 A CN201610826149 A CN 201610826149A CN 106198719 B CN106198719 B CN 106198719B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
- G01N27/85—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields using magnetographic methods
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C23/00—Non-electrical signal transmission systems, e.g. optical systems
- G08C23/06—Non-electrical signal transmission systems, e.g. optical systems through light guides, e.g. optical fibres
Abstract
The invention discloses a kind of underwater conducting material structure object defect alternating current field measurement instruments, including being located at the computer above the water surface on operation ship, cable, underwater module and probe below the water surface, computer is connected by the Ethernet output port of cable and NET2801, lithium battery by Voltage stabilizing module respectively with NET2801, signal processing module, excitation module is connected with three axis TMR sensors, excitation module is connect with the excitation coil being wrapped on cylinder magnetic core, the output terminal of three axis TMR sensors is connected by the input end of analog signal of signal processing module and NET2801.The beneficial effects of the invention are as follows：Underwater probe signal long-distance transmission attenuation is effectively solved the problems, such as using Ethernet transmission or optical fiber transmission technique, it is detected available for the defects of complicated submerged structure, reach the qualitative assessment of 3 D defects size, can be used in the detection of conducting material structure object defect in depth of water ocean within 100m.
Description
Technical field
The present invention relates to marine structure defect technical field of nondestructive testing, more particularly to a kind of underwater conducting material structure
Object defect alternating current field measurement instrument.
Background technology
With the exhaustion of land resources, more and more resources step into the ocean development epoch.Marine resources development needs
A large amount of human and material resources and financial support are wanted, particularly all kinds of extra large toolings are standby and works generally requires advanced technology and height
High cost.All kinds of marine structures after military service are chronically at marine corrosion environment, bear different types of huge load, by
To the destruction of ocean bottom currents, it is easy to the defects of generating various types.Works defect gradually develops under external force
Grow, the failure of works may finally be caused, jeopardize operating personnel's safety, the loss of bringing on a disaster property.
Due to the particularity of marine environment, underwater detection technique has higher requirement.Ocean background noise is larger, signal
It is larger to water surface ordinary loss by underwater transmission, influence the analysis and judgement of flaw indication；Marine structure surface has thicker
Attachment and corrosion-inhibiting coating, traditional detection means, such as magnetic powder, infiltration, vortex, leakage field etc. need thorough to works surface
Cleaning, detection efficiency is low and is easily destroyed the corrosion-inhibiting coating of works；Underwater detection has the leakproofness of probe and system higher
It is required that the media property of seawater limits the underwater application of the detection techniques such as ray, ultrasound；The usual structure of underwater structure is answered
Miscellaneous, the connection such as pipe network, jacket is intricate, has to the performance of the structure size of probe and system, leakproofness and detection defect
High requirement.
Alternating current field measurement (ACFM) technology is a kind of novel non-destructive testing technology, due to alternating current field measurement skill
Art influences lift-off small, and flaw indication feature is apparent, can qualitative deficiency, without demarcating in advance, be applicable in various conductive materials, it is special
Not Shi He Underwater Structure's Surface Flaws detection.Traditional underwater ACFM instruments need to transfer using underwater robot mode, into
This is high, and operating efficiency is low, is difficult to arrive at especially for complicated underwater structure routine ACFM probes.Traditional underwater ACFM inspections
It surveys instrument and usually detects distorted magnetic field, accuracy of detection and poor reliability by the coil type sensor of both direction, by feature
Signal Bx, Bz can only assess the depth and length of defect, ignore the By key messages of reflection defect width, it is impossible to realize defect
The assessment of three-dimensional dimension.
Invention content
The purpose of the present invention, using alternating current field measurement technology, is passed aiming at prior art deficiency using Ethernet
Defeated or optical fiber transmission technique effectively solves the problems, such as underwater probe signal long-distance transmission attenuation, and design structure is compact, convenient for close
The underwater detection probe and signal processing module of diver's carrying are sealed, facilitated, to pop one's head in using three axis TMR sensors of high-precision
Structure becomes more compact, is detected available for the defects of complicated submerged structure, three axis TMR sensors can obtain abnormal around defect
Varying magnetic field Bx, By and Bz can assess the depth and width and length of defect respectively, reach the qualitative assessment of 3 D defects size, energy
It is enough in the detection of conducting material structure object defect in depth of water ocean within 100m.
A kind of underwater conducting material structure object defect alternating current field measurement instrument, including being located above the water surface on operation ship
Computer, cable, the underwater module below the water surface and probe, the underwater module includes housing and in housing
NET2801, lithium battery, voltage transformation module, signal processing module, excitation module, the probe includes probing shell and peace
Excitation coil, cylinder magnetic core, three axis TMR sensors in probing shell, end cap, water-stop plug, sensor sleeve, it is described
Computer by the Ethernet output port of cable and NET2801 connect, the lithium battery by Voltage stabilizing module respectively with
NET2801, signal processing module, excitation module are connected with three axis TMR sensors, in the charge port and Casing top of lithium battery
Data transmission plug connects, and the excitation module is connect with the excitation coil being wrapped on cylinder magnetic core, the three axis TMR sensings
The output terminal of device is connected by the input end of analog signal of signal processing module and NET2801.
The housing of the underwater module includes bottom cover, main casing, head cover, probe plug, data transmission plug, link and hangs
Ring, the main chamber that the main casing is cylindrical housings and inside is annular space, main casing top are equipped with stepped hole first and positioned at stepped hole first
On and diameter be more than the stepped hole second of stepped hole first, main casing bottom is equipped with stepped hole third and under stepped hole third and diameter
More than the stepped hole fourth of stepped hole third, the bottom cover lower part is disk with the stepped hole fourth coaxial cooperation of main casing bottom, bottom cover
Top is equipped with the boss first with the third coaxial cooperation of stepped hole of main casing lower part, and boss first is internally provided with blind hole first, bottom cover lower part circle
Above disk with below stepped hole fourth between be equipped with gasket first, bottom cover is mounted on main casing lower step hole fourth by six bolts
The bolt hole on top is equipped with sealing ring between the upper surface of bottom cover upper boss first and the lower surface in main casing bottom stage hole third
First, bottom cover bottom surface set there are three in 120 ° distribution supporting legs.
The head cover top is the disk with main casing upper step hole second coaxial cooperation, and head cover lower part is equipped with and main casing top
The boss second of stepped hole first coaxial cooperation, boss second are internally provided with blind hole second, bottom surface and the main casing top of head cover upper disk
Gasket second is equipped between the upper surface of stepped hole second, head cover is mounted on main casing upper step hole second lower part by six bolts
Bolt hole, is equipped with sealing ring second between the boss second bottom surface of head cover lower part and the stepped hole first upper surface on main casing top, probe is inserted
Head and data transmission plug are mounted on head cover, and link lower end is four cylinders for being welded on head cover upper surface, on link
The thin plate that two intersections are equipped with for circular and center is held, the hanging ring is mounted on the center of two intersection thin plates of link.
The signal processing module and excitation module are mounted on the upper surface of the blind hole second of head cover, the lithium electricity by bolt
Pond and voltage transformation module are mounted on the lower surface of the blind hole first of bottom cover by bolt, and the NET2801 is mounted on by bolt
Between head cover and bottom cover, optionally, A/D modular converters and optic fiber emission modules are mounted on the upper of the head cover blind hole second of probe main casing
Surface.
The cylinder magnetic core of winding excitation coil is coaxially mounted to inside cylindrical, hollow probing shell, and outside is equipped with interior quadrangle
The end cap in hole is mounted on probing shell one end by screw boss first, and gasket third is equipped between probing shell end face and end cap,
Water-stop plug is mounted on the probing shell other end, and probing shell lower part is equipped with cone boss, cone boss inside and probe shell
The hollow space of body communicate and bottom be equipped with threaded hole, the sensor sleeve upper end be screwed boss second, sensor sleeve
Center is circular hole, and sensor sleeve lower part is square and has the square of fillet, and the sensor sleeve relies on top screw boss second
In the lower thread hole of cone boss, gasket fourth is equipped between sensor sleeve and cone boss, the three axis TMR is passed
Sensor be the long 4mm wide 4mm high 2mm of package dimension three screw alley magnetoresistive magnetic field sensors, three axis TMR sensor X sensitive axis with
The axis of probing shell is parallel, the plane perpendicular of three axis TMR sensor Z sensitive axis and sensor sleeve.
The NET2801 can be replaced by A/D modular converters and optic fiber emission modules, and the cable can be connect by optical fiber and optical fiber
It receives module to replace, three axis TMR sensors in probe are connect with signal processing module, and signal processing module passes through A/D moduluss of conversion
Block is connect with optic fiber emission modules, and optic fiber emission modules are connect by optical fiber with the optic fiber transceiver module on the water surface on operation ship,
Optic fiber transceiver module is connect with computer.
Description of the drawings
Attached drawing 1 is the system block diagram of the present invention.
Attached drawing 2 is the underwater function structure chart of the present invention.
Attached drawing 3 is the underwater inside modules figure of the present invention.
Attached drawing 4 is the underwater module sectional view of the present invention.
Attached drawing 5 is the sonde configuration schematic diagram of the present invention.
Attached drawing 6 is the probe sectional view of the present invention.
Attached drawing 7 is the optical fiber transmission plan schematic diagram of the present invention.
In upper figure：Computer (1), operation ship (2), cable (3), underwater module (4), housing (4.1), bottom cover (4.1.1),
Gasket first (4.1.1.1), sealing ring first (4.1.1.2), blind hole first (4.1.1.3), boss first (4.1.1.4), supporting leg
(4.1.1.5), main casing (4.1.2), main chamber (4.1.2.1), stepped hole first (4.1.2.2), stepped hole second (4.1.2.3), step
Hole third (4.1.2.4), stepped hole fourth (4.1.2.5), head cover (4.1.3), gasket second (4.1.3.1), sealing ring second
(4.1.3.2), blind hole second (4.1.3.3), boss second (4.1.3.4), probe plug (4.1.4), data transmission plug
(4.1.5), link (4.1.6), hanging ring (4.1.7), NET2801 (4.2), lithium battery (4.3), Voltage stabilizing module (4.4), signal
Processing module (4.5), excitation module (4.6), A/D modular converters (4.7), optic fiber emission modules (4.8), probe (5), excitation line
Enclose (5.1), cylinder magnetic core (5.2), three axis TMR sensors (5.3), probing shell (5.4), cone boss (5.4.1), end cap
(5.5), gasket third (5.5.1), interior four corner apertures (5.5.2), screw boss first (5.5.3), water-stop plug (5.6), sensing
Device set (5.7), gasket fourth (5.7.1), screw boss second (5.7.2), optical fiber (6), optic fiber transceiver module (6.1).
Specific embodiment
With reference to attached drawing 1-7, the invention will be further described：
Purpose, technical scheme and advantage to make the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical solution in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The all other embodiment obtained under the premise of not making the creative labor, shall fall within the protection scope of the present invention.
It should be noted that in the absence of conflict, the feature in the embodiment of the present invention and embodiment can be mutual
Combination.
Embodiment 1
As shown in Figure 1, the present invention includes the computer (1) being located on water surface top operation ship (2), cable (3), positioned at water
Underwater module (4) and probe (5) below face, the underwater module (4) is including housing (4.1) and in housing
NET2801 (4.2), lithium battery (4.3), voltage transformation module (4.4), signal processing module (4.5), excitation module (4.6), institute
State excitation coil (5.1), cylinder magnetic core of the probe (5) including probing shell (5.4) and in probing shell (5.4)
(5.2), three axis TMR sensors (5.3), end cap (5.5), water-stop plug (5.6), sensor sleeve (5.7), the computer
(1) it is connect by cable (3) with the Ethernet output port of NET2801 (4.2), the lithium battery (4.3) passes through Voltage stabilizing module
(4.4) connect respectively with NET2801 (4.2), signal processing module (4.5), excitation module (4.6) and three axis TMR sensors (5.3)
It connects, the charge port of lithium battery (4.3) is connect with the data transmission plug (4.1.5) on housing (4.1) head cover (4.1.3), described
Excitation module (4.6) is connect with the excitation coil (5.1) being wrapped on cylinder magnetic core (5.2), the three axis TMR sensor
(5.3) output terminal is connect by signal processing module (4.5) with the input end of analog signal of NET2801 (4.2).
As in Figure 2-4, the housing (4.1) of the underwater module (4) includes bottom cover (4.1.1), main casing (4.1.2), top
(4.1.3), probe plug (4.1.4), data transmission plug (4.1.5), link (4.1.6) and hanging ring (4.1.7) are covered, it is described
The main chamber (4.1.2.1) that main casing (4.1.2) is cylindrical housings and inside is annular space, main casing (4.1.2) top are equipped with stepped hole
First (4.1.2.2) and on stepped hole first and diameter be more than stepped hole first stepped hole second (4.1.2.3), main casing
(4.1.2) bottom is equipped with stepped hole third (4.1.2.4) and under stepped hole third and diameter is more than the stepped hole of stepped hole third
Fourth (4.1.2.5), bottom cover (4.1.1) lower part are stepped hole fourth (4.1.2.5) coaxial cooperation with main casing (4.1.2) bottom
Disk, bottom cover (4.1.1) top is equipped with boss with stepped hole third (4.1.2.4) coaxial cooperation of main casing (4.1.2) lower part
First (4.1.1.4), boss first (4.1.1.4) are internally provided with blind hole first (4.1.1.3), above bottom cover (4.1.1) lower disk with
Gasket first (4.1.1.1) is equipped between below stepped hole fourth (4.1.2.5), bottom cover (4.1.1) is installed by six bolts
Bolt hole on main casing (4.1.2) lower step hole fourth (4.1.2.5) top, bottom cover (4.1.1) upper boss first (4.1.1.4)
Third (4.1.2.4) of upper surface and main casing (4.1.2) bottom stage hole lower surface between be equipped with sealing ring first (4.1.1.2),
Tighten the bolt between bottom cover (4.1.1) and main casing (4.1.2), bottom cover (4.1.1) and meanwhile compress gasket first (4.1.1.1) and
Sealing ring first (4.1.1.2), formed two-stage waterproof sealing, bottom cover bottom surface set there are three in 120 ° distribution supporting legs
(4.1.1.5), for stablizing support in the seawater.
As in Figure 2-4, head cover (4.1.3) top is same with main casing (4.1.2) upper step hole second (4.1.2.3)
The disk of axis cooperation, head cover (4.1.3) lower part are equipped with and main casing (4.1.2) upper step hole first (4.1.2.2) coaxial cooperation
Boss second (4.1.3.4), boss second (4.1.3.4) are internally provided with blind hole second (4.1.3.3), head cover (4.1.3) upper disk
Gasket second (4.1.3.1), top are equipped between the upper surface of the stepped hole second (4.1.2.3) on bottom surface and main casing (4.1.2) top
Cover the bolt hole that (4.1.3) is mounted on main casing (4.1.2) upper step hole second (4.1.2.3) lower part by six bolts, head cover
Boss second (4.1.3.4) bottom surface of (4.1.3) lower part and stepped hole first (4.1.2.2) upper surface on main casing (4.1.2) top it
Between be equipped with sealing ring second (4.1.3.2), tighten the bolt between head cover (4.1.3) and main casing (4.1.2), head cover (4.1.3) is together
When compress gasket second (4.1.3.1) and sealing ring second (4.1.3.2), form two-stage waterproof sealing, pop one's head in plug (4.1.4) and
Data transmission plug (4.1.5) is on head cover (4.1.3), and link (4.1.6) lower end is is welded on head cover (4.1.3)
Four cylinders on surface, link (4.1.6) upper end are equipped with the thin plate of two intersections, the hanging ring for circular and center
(4.1.7) is mounted on the center of two intersection thin plates of link (4.1.6).
As shown in Figure 3-4, the signal processing module (4.5) and excitation module (4.6) are mounted on head cover by bolt
The upper surface of the blind hole second (4.1.3.3) of (4.1.3), the lithium battery (4.3) and voltage transformation module (4.4) are pacified by bolt
Mounted in the lower surface of the blind hole first (4.1.1.3) of bottom cover (4.1.1), the NET2801 (4.2) is mounted on head cover by bolt
Between (4.1.3) and bottom cover (4.1.1).
As seen in figs. 5-6, the cylinder magnetic core (5.2) of the winding excitation coil (5.1) is coaxially mounted to cylindrical, hollow
Probing shell (5.4) is internal, and cylindrical structure is conducive to the underwater sealing design of probe (5) and encapsulation, outside are equipped with interior quadrangle
The end cap (5.5) in hole (5.5.2) is by screw boss first (5.5.3) mounted on probing shell (5.4) one end, interior four corner apertures
(5.5.2) is equipped with gasket third (5.5.1), water for the installation of end cap between probing shell (5.4) end face and end cap (5.5)
Sealing plug (5.6) is equipped with cone boss (5.4.1) mounted on probing shell (5.4) other end, probing shell (5.4) lower part,
It is communicated inside cone boss (5.4.1) with the hollow space of probing shell (5.4) and bottom is equipped with threaded hole, the sensor sleeve
(5.7) upper end be screwed boss second (5.7.2), sensor sleeve (5.7) center be circular hole, sensor sleeve (5.7) lower part
For square and there is the square of fillet, the lower part tetragonal structure of sensor sleeve (5.7) is conducive to tighten by spanner, the biography
Sensor set (5.7) in the lower thread hole of cone boss (5.4.1), is sensed by top screw boss second (5.7.2)
Gasket fourth (5.7.1) is equipped between device set (5.7) and cone boss (5.4.1), the three axis TMR sensor (5.3) is envelope
The three screw alley magnetoresistive magnetic field sensors of the long 4mm wide 4mm high 2mm of size are filled, smaller size sensor may be such that probe size
That does is very small, is conducive to the detection of underwater complex fault of construction, three axis TMR sensor (5.3) X sensitive axis and probing shell
(5.4) axis is parallel, three axis TMR sensor (5.3) Z sensitive axis and the plane perpendicular of sensor sleeve (5.7).
The voltage of lithium battery (4.3) output keeps voltage stabilization after Voltage stabilizing module (4.4), is conducive to obtain stable
Defect characteristic signal reduces the influence of internal system supply voltage or lithium battery drops to flaw indication, Voltage stabilizing module
(4.4) power supply of output passes respectively to NET2801 (4.2), signal processing module (4.5), excitation module (4.6) and three axis TMR
Sensor (5.3) is powered, and excitation module (4.6) sends out sinusoidal or pulse excitation signal and is loaded onto the internal excitation coil of probe (5)
(5.1) on, cylinder magnetic core (5.2) can reduce the aerial attenuation of excitation coil (5.1) internal magnetic field, excitation coil
(5.1) magnetic field in can induce the larger uniform electricity of intensity under cylinder magnetic core (5.2) effect in lower metal conductive surface
, it changes when electric field encounters defect, metal surface disturbance electric field causes space magnetic field to distort, mounted on probing shell
(5.4) triaxial magnetic field sensor (5.3) in bottom sensor set (5.7) can effectively obtain defect characteristic three directions it is abnormal
Varying magnetic field signal Bx, By and Bz, three road magnetic field signals are conducive to analyze depth of defect, width and length, realize defect
The assessment of three-dimensional dimension, three road magnetic field signals enter NET2801 (4.2) by signal processing module (4.5) amplification, filtering process
Module, NET2801 (4.2) incorporate A/D conversions, data acquisition and Ethernet transfer function, three tunnel analog signals are become several
Word signal is transmitted to computer (1) above the water surface by cable (3), can be with since digital signal decays very little in cable
Realize the transmission of 100m depth of water flaw indication characteristic signals, computer (1) can be analyzed and be handled to flaw indication, waterborne
Computer (1) and the cable (3) of underwater module (4) connection can be plugged freely, the signal popped one's head in (5) between underwater module (4)
Transmission cable can freely plug between water-stop plug (5.6) and probe plug (4.1.4), not influence transport and underwater probe
It changes the outfit, effectively avoids the cable winds problem of underwater work, lithium battery (4.3) can be filled by data transmission plug (4.1.5) port
Electricity, charge capacity 1000mAH can provide the electricity of 6 hours for underwater module and probe.
Embodiment 2
As shown in fig. 7, the embodiment of another deformation as the present invention, the NET2801 (4.2) can be converted by A/D
Module (7.7) and optic fiber emission modules (4.8) are replaced, and the cable (6) can be replaced by optical fiber (6) and optic fiber transceiver module (6.1)
It changes, A/D modular converters (4.7) and optic fiber emission modules (4.8) are blind mounted on the head cover (4.1.3) of probe (5) main casing (4.1.2)
The upper surface of Kong Yi (4.1.3.3), the signal of underwater module (4) can also be transmitted to by optical fiber (6) on the water surface, popped one's head in (5)
Three interior axis TMR sensors (5.3) are connect with signal processing module (4.5), and signal processing module (4.5) passes through A/D moduluss of conversion
Block (4.7) is connect with optic fiber emission modules (4.8), and optic fiber emission modules (4.8) pass through operation ship (2) on optical fiber (6) and the water surface
On optic fiber transceiver module (6.1) connection, optic fiber transceiver module (6.1) connect with computer (1), three axis TMR sensors (5.3)
Pickup distorted magnetic field signal becomes digital signal, optical fiber after signal processing module (4.5) into A/D modular converters (4.7)
Digital signal is transmitted to the optic fiber transceiver module (6.1) on the water surface by transmitting module (4.8) by optical fiber (6), and optical fiber transmission can
Effectively outer signals is avoided to interfere, improves the stability of signal, optic fiber transceiver module (6.1) by the digital data transmission of reception extremely
Computer (1), computer (1) are handled and are analyzed to received signal.
The beneficial effects of the invention are as follows：Underwater probe Chief Signal Boatswain is effectively solved using Ethernet transmission or optical fiber transmission technique
The problem of Distance Transmission decays, design structure is compact, convenient for sealing, facilitate at the underwater detection probe and signal that diver carries
Module is managed, using highly sensitive three axis TMR sensors, underwater probe structure becomes more compact, available for complicated submerged structure
The defects of detect, three axis TMR sensors can obtain distorted magnetic field Bx, By and Bz around defect, can assess the depth of defect respectively
Degree, width and length, reach the qualitative assessment of 3 D defects size, can be used in depth of water ocean conducting material structure within 100m
The detection of object defect.
The present invention is not limited to above-mentioned specific embodiment, according to the above, according to the ordinary technical knowledge of this field
And customary means, under the premise of the above-mentioned basic fundamental thought of the present invention is not departed from, the present invention can also make other diversified forms
Equivalent modifications, replacement or change, all belong to the scope of protection of the present invention.
Claims (6)
1. a kind of underwater conducting material structure object defect alternating current field measurement instrument, it is characterized in that：Including being located above the water surface
Computer, cable on operation ship, the underwater module below the water surface and probe, the underwater module include housing and installation
NET2801, lithium battery, voltage transformation module, signal processing module, excitation module in housing, the probe include probe
Housing and excitation coil in probing shell, cylinder magnetic core, three axis TMR sensors, end cap, water-stop plug, sensing
Device set, the computer are connected by the Ethernet output port of cable and NET2801, and the lithium battery passes through Voltage stabilizing module point
It is not connect with NET2801, signal processing module, excitation module and three axis TMR sensors, the charge port and Casing top of lithium battery
On data transmission plug connection, it is described excitation module connect with the excitation coil being wrapped on cylinder magnetic core, the three axis TMR
The output terminal of sensor is connected by the input end of analog signal of signal processing module and NET2801, winds the circle of excitation coil
Column magnetic core is coaxially mounted to inside cylindrical, hollow probing shell, and the end cap that outside is equipped with interior four corner apertures is pacified by screw boss first
Gasket third is equipped between probing shell one end, probing shell end face and end cap, water-stop plug is mounted on probing shell
The other end, probing shell lower part are equipped with cone boss, are communicated inside cone boss with the hollow space of probing shell and bottom is set
There is threaded hole, the sensor sleeve upper end is screwed boss second, and sensor sleeve center is circular hole, and sensor sleeve lower part is
Square and the square for having fillet, the sensor sleeve are mounted on the lower thread hole of cone boss by top screw boss second
It is interior, gasket fourth is equipped between sensor sleeve and cone boss, the three axis TMR sensor is the long 4mm wide 4mm high of package dimension
The three screw alley magnetoresistive magnetic field sensors of 2mm, three axis TMR sensor X sensitive axis are parallel with the axis of probing shell, three axis TMR
The plane perpendicular of sensor Z sensitive axis and sensor sleeve.
2. a kind of underwater conducting material structure object defect alternating current field measurement instrument according to claim 1, feature
It is：The housing of the underwater module includes bottom cover, main casing, head cover, probe plug, data transmission plug, link and hanging ring, institute
State the main chamber that main casing is cylindrical housings and inside is annular space, stepped hole first is equipped at the top of main casing and on stepped hole first and
Diameter is more than the stepped hole second of stepped hole first, and main casing bottom is equipped with stepped hole third and under stepped hole third and diameter is more than platform
The stepped hole fourth in rank hole third, the bottom cover lower part are the disk with the stepped hole fourth coaxial cooperation of main casing bottom, and bottom cover top is set
There is a boss first with the third coaxial cooperation of the stepped hole of main casing lower part, boss first is internally provided with blind hole first, above bottom cover lower disk
With below stepped hole fourth between be equipped with gasket first, bottom cover is mounted on main casing lower step hole fourth top by six bolts
Bolt hole is equipped with sealing ring first, bottom cover between the upper surface of bottom cover upper boss first and the lower surface in main casing bottom stage hole third
Bottom surface is in 120 ° of supporting legs being distributed there are three setting.
3. a kind of underwater conducting material structure object defect alternating current field measurement instrument according to claim 1, feature
It is：The head cover top is the disk with main casing upper step hole second coaxial cooperation, and head cover lower part is equipped with and main casing upper step
The boss second of hole first coaxial cooperation, boss second are internally provided with blind hole second, the bottom surface of head cover upper disk and the step on main casing top
Gasket second is equipped between the upper surface of Kong Yi, head cover is mounted on the bolt of main casing upper step hole second lower part by six bolts
Hole, between the boss second bottom surface of head cover lower part and the stepped hole first upper surface on main casing top be equipped with sealing ring second, probe plug and
Data transmission plug is mounted on head cover, and link lower end is four cylinders for being welded on head cover upper surface, and link upper end is
Circular and center is equipped with the thin plate of two intersections, and hanging ring is mounted on the center of two intersection thin plates of link.
4. a kind of underwater conducting material structure object defect alternating current field measurement instrument according to claim 1, feature
It is：The signal processing module and excitation module by bolt be mounted on head cover blind hole second upper surface, the lithium battery and
Voltage transformation module is mounted on the lower surface of the blind hole first of bottom cover by bolt, and the NET2801 is mounted on head cover by bolt
Between bottom cover.
5. a kind of underwater conducting material structure object defect alternating current field measurement instrument according to claim 1, feature
It is：The NET2801 is replaced by A/D modular converters and optic fiber emission modules, and the cable is replaced by optical fiber and optic fiber transceiver module
It changes, three axis TMR sensors in probe are connect with signal processing module, and signal processing module passes through A/D modular converters and optical fiber
Transmitting module connects, and optic fiber emission modules are connect by optical fiber with the optic fiber transceiver module on the water surface on operation ship, and optical fiber receives
Module is connect with computer.
6. a kind of underwater conducting material structure object defect alternating current field measurement instrument according to claim 5, feature
It is：The A/D modular converters and optic fiber emission modules are mounted on the upper surface of the head cover blind hole second of probe main casing.
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