CN100370241C - Underwater hardware detection method and device - Google Patents
Underwater hardware detection method and device Download PDFInfo
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- CN100370241C CN100370241C CNB2004100772319A CN200410077231A CN100370241C CN 100370241 C CN100370241 C CN 100370241C CN B2004100772319 A CNB2004100772319 A CN B2004100772319A CN 200410077231 A CN200410077231 A CN 200410077231A CN 100370241 C CN100370241 C CN 100370241C
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Abstract
The present invention provides an underwater metal product detection method which comprises the following steps that a pulsed laser can generate photoinduced ultrasound after injected into water; photoinduced ultrasound reflected by underwater metal products can modulate the injected continuous scattering laser; laser signals from a modulation area can be collected by an optical collector; the laser signals can be converted to electrical signals by photoelectric conversion; the electrical signals can be separated by a signal frequency spectrum, and modulation signals can be extracted; a computer can be used for positioning by modulation signal delay time. An underwater metal product detection device comprises a laser, an optical collector, a photoelectric conversion component, an oscilloscope, an embedded real-time fast Fourier transform module and a computer, wherein the laser and the optical collector are arranged on the same side corresponding to a detection object; the optical collector and the photoelectric conversion component are connected by optical coupling; the photoelectric conversion component, the oscilloscope, the embedded real-time fast Fourier transform module and the computer are orderly and electrically connected. The present invention has the advantages of simple operation and high accuracy, and can exactly detect underwater metal products.
Description
Technical field
The present invention relates to physical detecting metal object technology, particularly a kind of method and device of surveying underwater hardware.
Background technology
The existing detection method that is used for immersed body comprises sonar, the detection that all is difficult to carry out in the air underwater hardware such as infrared, and the military at present antisubmarine aircraft that uses of going up mainly is to utilize " Electronic Nose " technology the waste gas of the submarine in seabed to be surveyed its precision and restricted application.When with photoirradiation certain object, because it can make its temperature inside change to the absorption of light, thereby the mechanical parameter that causes its regional area changes; When adopting light-pulse generator or modulated light source, the fluctuating of local temperature can cause the flexible of its volume in the object, thereby outside radiate supersonic wave, and this phenomenon is called photic ultrasonic field effect (abbreviation optoacoustic effect); Because the existence of photic ultrasonic field (optoacoustic field), can modulate optical index, produce corresponding modulation light field, just make the characteristic of photic ultrasonic (optoacoustic) on this distribution of light intensity band, particularly frequency characteristic can be analyzed this light field signal that detects by spectrum technology.Use above principle, can develop a kind of technology of surveying underwater hardware.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, a kind of realization simple to operate, easy, underwater hardware detection method that degree of accuracy is high are provided.
Another object of the present invention is to provide a kind of underwater hardware sniffer of realizing said method.
Purpose of the present invention realizes by following proposal: this underwater hardware detection method mainly comprises following operation steps---
(1) pulse laser is gone in the jetting, produce photic ultrasonic;
(2) modulate by the photic ultrasonic continuous scattering laser of underwater hardware reflection incident;
(3) utilize the collect scattered light signal in self-modulation zone of light collector, by opto-electronic conversion, modulated light signal is converted into electric signal, and carries out real-time monitored by oscillograph;
(4) electric signal is carried out frequency spectrum and separate, extract modulation signal;
(5) utilizing computing machine to delay time by modulation signal positions.
Described pulse laser wavelength scope is 500～1500nm; Described continuous scattering laser wavelength coverage is 1 μ m～15 μ m.
Be used to produce the preferred Nd:YAG pulsed laser of light source of pulse laser, wavelength is 1064nm, and pulsewidth is 6ns, and repetition frequency is 20Hz, and this wavelength water absorbs stronger, can produce stronger photic ultrasonic; The light source that is used to produce continuous scattering laser preferably produces the laser instrument of 10.2 continuous μ m exploring laser lights.
Described pulse laser or continuous scattering laser send the back coupled into optical fibres by laser instrument and reenter in the jetting.
Described laser incident and laser signal are collected and are reflective geometric layout.
Adopting real-time in the described step (4), the Fourier pair electric signal carries out spectrum transformation, the Modulation Signals Recognition of photic ultrasonic frequency domain, and finish the signal filtering noise reduction process simultaneously, inversefouriertransform returns time domain, utilizes time-domain information that the underwater hardware degree of depth is positioned.
The underwater hardware sniffer of realizing said method comprises laser instrument, light collector, photoelectric conversion component, oscillograph and the built-in module of Fourier transform real-time, computing machine, described laser instrument and light collector are provided with respect to the detected object homonymy, light collector is connected by optically-coupled with photoelectric conversion component, and photoelectric conversion component, oscillograph are electrically connected successively with the built-in module of Fourier transform real-time, computing machine.
Described laser instrument comprises pulsed laser and continuous scattering laser device, described pulsed laser and continuously the scattering laser device be connected with laser controller simultaneously, described pulsed laser reaches real-time with oscillograph that the Fourier transform module is connected.
Described laser instrument is connected with the laser delivery optical fiber, and described laser delivery optical fiber goes out optical port and is arranged in the water surface or stretches into water; The collection port that described laser delivery optical fiber goes out optical port and light collector is in detected object the same side.
Described photoelectric conversion component comprises photomultiplier, electric signal amplifier.
This underwater hardware sniffer also can include three-dimensional mobile platform, the collection port that described laser delivery optical fiber goes out optical port and light collector is fixedlyed connected with three-dimensional mobile platform, can drive by three-dimensional mobile platform and do moving freely of three directions in top to bottom, left and right, front and rear, described three-dimensional mobile platform is connected with computing machine, by computing machine it is controlled.
Mechanism of the present invention is: when pulse laser is incident in the water surface, water will produce photic acoustic field signal after absorbing, this photic ultrasonic field will be modulated the scattering laser of the incident water surface, continue simultaneously to propagate downwards, photic acoustic field signal will continue to diffusion under water, until disappearance when anhydrous time metal object; If when having under water metallic foreign body, photic ultrasonic field will be modulated the scattering laser of the incident water surface at the water surface once more by the underwater hardware reflected back water surface; In contrast,, just do not have yet and return sound field if there is not metal object under water, so scattered light signal is not modulated, the noise that the scattered light signal of collection has only wave to cause, the frequency spectrum of this ground unrest is very wide, and does not have provincial characteristics, and available pairing comparision is got rid of.Like this when metal object being arranged under water, photic sound field will produce two groups of modulation signals, and time-delay is arranged on time domain, can know differentiation, and can utilize time-delay accurately to calculate the underwater hardware degree of depth, promptly Yan Shi half is multiplied by the degree of depth that ultrasonic propagation velocity can draw underwater hardware.
The present invention has the following advantages with respect to prior art:
1, the detection method of the physical principle that combines of employing sound of the present invention, light and technology metallic foreign body under water that a kind of novelty is provided is simple to operate, realizes easily, can be dual-use.
2, the present invention combines the ultrasonic sensitivity that penetrates by force, hangs down decay and optical detection, quick advantage in water, can realize quick detection.
3, the present invention adopts the fast Fourier transform module processing signals, can change time-domain signal into frequency-region signal, thereby not only can implement the filtering noise reduction but also can extract corresponding frequency-region signal, is convenient to useful signal is caught.
4, apparatus of the present invention are simple in structure, and the integrability manufacturing is produced; Processing ease is convenient to large-scale promotion application.
Description of drawings
Fig. 1 is the structural representation of underwater hardware sniffer of the present invention.
Fig. 2 is the laser incident of underwater hardware sniffer shown in Figure 1 and the synoptic diagram of signal collection.
Fig. 3 is the signal graph that utilizes underwater hardware detection shown in Figure 1 to arrive.
Fig. 4 is the spectrogram that utilizes the light signal that underwater hardware sniffer shown in Figure 1 surveys.
Embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited thereto.
Concrete structure of the present invention as shown in Figure 1, as seen from Figure 1, this underwater hardware sniffer comprises light source assembly 1, light is collected and opto-electronic conversion processing components 2, metal sample 3, sample cell 4, computer data acquiring and control system 5, three-D electric mobile platform 6 is formed; Light source assembly 1 is connected and composed by continuous scattering laser device 1-1, pulsed laser 1-2, laser delivery optical fiber 1-a; The collection port that described laser delivery optical fiber 1-a goes out optical port and light collector 2-a is in detected object the same side, is reflective setting, specifically as shown in Figure 2; Light is collected with opto-electronic conversion processing components 2 and is connected in sequence by light collector 2-a, photomultiplier 2-1, electric signal amplifier 2-2, the oscillograph 2-3 that has a built-in real time fourier processing modular assembly; Computer data acquiring and control system 5 comprise computing machine, general purpose interface bus card (PCI-GPIB, National Instruments Co.), described computing machine is connected with oscillograph 2-3 by the general purpose interface bus card, simultaneous computer is connected with three-D electric mobile platform 6 by digital input and output interfaces card (7270, Advatech Co.).The concrete type selecting of aforementioned each member is as follows: continuously scattering laser device 1-1 selects the U.S. for use relevant (can send wavelength is single mode red laser and the infrared laser of 630nm～1100nm for coheret, Ltd.) company's titanium jewel ring laser; Pulsed laser 1-2 selects the Nd:YAG pulsed laser of Pioneer Electronic Corp. for use, and laser source wavelength is 1064nm, and pulsewidth is 6ns, and repetition frequency is 20Hz; Photomultiplier 2-1 select for use the avalanche photodide module (C5469, APD, Hamamatsu); The general commercial style of electric signal amplifier 2-2 (AD522, Analog Devices Inc.); The TDS3032 type that oscillograph 2-3 produces for Tektronix company, its built-in module of Fourier transform is real-time selected the TDS3FFT type of Tektronix company for use; Computing machine adopts the above type of IBM686 type; Three-D electric mobile platform 6 turns round by stepper motor and controls the accurate location of realizing all around, above-below direction, wherein the running of stepper motor is crossed digital input and output interfaces card (7270, Advatech Co.) by the computer expert and is connect motor control box and realize.Sample cell 4 is rectangle tanks made from pmma material, fills the water of band scattering medium (Intralipid, HuaruiCompany, 20%) in the groove, and this scattering medium can carry out scattering to incident laser; Metal sample 3 is the metal ship model, and it can reflect photic ultrasonic signal.
The underwater hardware detection method detailed process that is realized by aforementioned means is as follows:
(1) to send wavelength be the continuous laser of 700nm to continuous wave laser 1-1 and be coupled into the laser delivery optical fiber and shine on the metal sample.
(2) to send wavelength be 1064nm to pulsed laser 1-2, pulsewidth is 6ns, repetition frequency is the pulse laser of 20Hz and is coupled into the laser delivery optical fiber, produce photic ultrasonic signal absorb the pulse laser of this wavelength when water after, to modulate the continuous laser (acoustooptic modulation) that is produced by continuous scattering laser device 1-1 by the photic ultrasonic signal that pulsed laser 1-2 produces, the band spectrum that is scattered light will have the spectrum information (see figure 4) of optoacoustic.In addition, the electric impulse signal external trigger oscillograph synchronous with light pulse that pulsed laser 1-2 itself produces finished the synchronous demonstration and the collection of electric signal.
(3) the light collector 2-a collection port of heavy caliber (diameter 1cm) is collected modulated laser signal (see figure 2), and imports and finish opto-electronic conversion by photomultiplier 2-1, and corresponding electric signal is sent among the electric signal amplifier 2-2 and amplified.
(4) electric signal that is exaggerated is sent into oscillograph 2-3, change time-domain signal into frequency-region signal by its built-in real time fourier processing module, because metal sample exists, to reflect photic ultrasonic signal, also will produce modulation behind this ultrasonic signal reflected back water surface to water surface scattered light signal, when oscillograph shows, can see the modulation signal in two time intervals like this, can judge that with this underwater hardware exists; And utilize the time-delay (T) of signal can accurately calculate its depth H, H=V*T/2, wherein V is ultrasonic velocity of propagation in water, thereby it (sees Fig. 3 to the metal object location, this figure reflects because the photic ultrasonic signal that metal object generates and propagates downwards surface level reflects, same so photic ultrasonic signal will modulate twice to the scattered light signal of the incident water surface, and have time-delay T); Described frequency-region signal can enter computing machine by the GPIB card collection that is connected with oscillograph and store and demonstrate, and simultaneous computer is by digital I control three-D electric mobile platform 6 motion scan diverse locations.
Claims (9)
1. underwater hardware detection method is characterized in that comprising following operation steps:
(1) pulse laser is gone in the jetting, produce photic ultrasonic;
(2) modulate by the photic ultrasonic continuous scattering laser of underwater hardware reflection incident;
(3) utilize the collect scattered light signal in self-modulation zone of light collector, by opto-electronic conversion, modulated light signal is converted into electric signal, and carries out real-time monitored by oscillograph;
(4) electric signal is carried out signal spectrum and separate, extract modulation signal;
(5) utilizing computing machine to delay time by modulation signal positions;
Described laser incident and laser signal are collected and are reflective geometric layout.
2. underwater hardware detection method according to claim 1 is characterized in that: described pulse laser wavelength scope is 500～1500nm; Described continuous scattering laser wavelength coverage is 630nm～1100nm.
3. underwater hardware detection method according to claim 1, it is characterized in that: the light source that is used to produce pulse laser is the Nd:YAG pulsed laser, wavelength is 1064nm, pulsewidth is 6ns, and repetition frequency is that the light source that 20Hz is used to produce continuous scattering laser is the laser instrument of 630nm～1100nm for the wavelengthtunable scope.
4. underwater hardware detection method according to claim 1 is characterized in that: described pulse laser or continuous scattering laser send the back coupled into optical fibres by laser instrument and reenter in the jetting.
5. underwater hardware detection method according to claim 1, it is characterized in that: adopting real-time in the step (4), the Fourier pair signal carries out spectrum transformation, extract and identification by photic ultrasonic modulation and have the specular scattering light signal of its frequency domain information, and finish the signal filtering noise reduction process simultaneously, inversefouriertransform returns time domain, utilizes time-domain information that the underwater hardware degree of depth is positioned.
6. realize the underwater hardware sniffer of each described method of claim 1～5, it is characterized in that: the oscillograph, the computing machine that comprise laser instrument, light collector, photoelectric conversion component, have the built-in module of Fourier transform real-time, described laser instrument and light collector are provided with respect to the detected object homonymy, light collector is connected by optically-coupled with photoelectric conversion component, and photoelectric conversion component, oscillograph are electrically connected successively with the built-in module of Fourier transform real-time, computing machine; Described laser instrument comprises pulsed laser and continuous scattering laser device.
7. underwater hardware sniffer according to claim 6, it is characterized in that: described pulsed laser is connected with laser controller with continuous scattering laser device simultaneously, and described pulsed laser is connected with the oscillograph with built-in module of Fourier transform real-time.
8. underwater hardware sniffer according to claim 6 is characterized in that: described laser instrument is connected with the laser delivery optical fiber, and described laser delivery optical fiber goes out optical port and is arranged in the water surface or stretches into water; The collection port that described laser delivery optical fiber goes out optical port and light collector is in detected object the same side.
9. underwater hardware sniffer according to claim 6, it is characterized in that: comprise three-dimensional mobile platform, the collection port that described laser delivery optical fiber goes out optical port and light collector is fixedlyed connected with three-dimensional mobile platform, and described three-dimensional mobile platform is connected with computing machine.
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| CNB2004100772319A CN100370241C (en) | 2004-12-10 | 2004-12-10 | Underwater hardware detection method and device |
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| CNB2004100772319A CN100370241C (en) | 2004-12-10 | 2004-12-10 | Underwater hardware detection method and device |
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| CN100370241C true CN100370241C (en) | 2008-02-20 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101378293B (en) * | 2007-08-29 | 2011-08-31 | 中国科学院自动化研究所 | Method and apparatus for measuring network node of underwater sensor |
| CN102980945B (en) * | 2012-10-11 | 2015-01-14 | 北京工业大学 | Frequency mixing nonlinear ultrasonic detection method for structure microcracks based on bispectrum analysis |
| CN104459816A (en) * | 2014-12-04 | 2015-03-25 | 上海理工大学 | Device and method for increasing detection distance of reflection type optocoupler |
| CN105738972B (en) * | 2016-04-15 | 2017-11-17 | 清华大学深圳研究生院 | A kind of undersea detection system and undersea detection method |
| CN108387942B (en) * | 2018-01-12 | 2020-01-14 | 西安理工大学 | Submarine combustible ice detector and detection method thereof |
| CN109507683A (en) * | 2018-11-09 | 2019-03-22 | 北京华夏光谷光电科技有限公司 | The laser acquisition method and device of the airborne shallow water depth of water |
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| JPH09257755A (en) * | 1996-03-22 | 1997-10-03 | Nippon Steel Corp | Laser ultrasonic inspection apparatus and method therefor |
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| CN1433739A (en) * | 2003-02-26 | 2003-08-06 | 华南师范大学 | Method and device for biological tissue photoacoustic tomography |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09257755A (en) * | 1996-03-22 | 1997-10-03 | Nippon Steel Corp | Laser ultrasonic inspection apparatus and method therefor |
| US5686661A (en) * | 1996-06-04 | 1997-11-11 | Mississippi State University | In-situ, real time viscosity measurement of molten materials with laser induced ultrasonics |
| CN1373362A (en) * | 2002-04-03 | 2002-10-09 | 华南师范大学 | Method and apparatus for measuring photoacoustic signal in biological tissue by ultrasonic beams |
| CN1433739A (en) * | 2003-02-26 | 2003-08-06 | 华南师范大学 | Method and device for biological tissue photoacoustic tomography |
Non-Patent Citations (1)
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| 液体中的激光超声脉冲. 戚诒让等.自然杂志，第25卷第2期. 2003 * |
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