CN202676278U - A sound pressure signal monitoring device of ocean background noise - Google Patents
A sound pressure signal monitoring device of ocean background noise Download PDFInfo
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- CN202676278U CN202676278U CN 201220225285 CN201220225285U CN202676278U CN 202676278 U CN202676278 U CN 202676278U CN 201220225285 CN201220225285 CN 201220225285 CN 201220225285 U CN201220225285 U CN 201220225285U CN 202676278 U CN202676278 U CN 202676278U
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Abstract
The utility model discloses a sound pressure signal monitoring device of ocean background noise. The sound pressure signal monitoring device comprises a housing body, and a light path system, a control system, and a power supply system which are disposed in the housing body. An opening is arranged on the left or right side of the housing body. A vibrating reed equipped with a reflecting plane is mounted at the opening. An enclosed cavity is formed by the vibrating reed and the housing body and the reflecting plane of the vibrating reed faces interior of the cavity. A separating plate equipped with a window is disposed inside the cavity so as to divide the cavity into a left part and a right part. The part where the vibrating reed is arranged is an air cavity which communicates with an air bag outside the housing body through a pipeline, while the other part is a device cavity where the control system, the power supply system, and a laser, a half-transmitting and half-reflecting spectroscope, a planar mirror, and a photoelectric receiver in the light path system are arranged. Structure of the light path system is designed by using Michelson interference principle in order to achieve high precision and good linearity. And the sound pressure signal monitoring device has no signal attenuation in low-frequency band and has good frequency response characteristic.
Description
Technical field
The utility model belongs to underwater monitoring device technique field, specifically, relates to a kind of equipment that carries out the sound pressure signal monitoring for the ground unrest to the ocean.
Background technology
Characteristic and the model of research marine background noise field, motion process that can the inverting ocean is understood the behavior of marine animal, and then is helped to carry out the identification of submarine target, the assessment of sonar performance and the research of hydroacoustic electronic warfare.Along with the development of modern industry production, ocean shipping and fishery, the characteristic more complex of marine background noise, this also has higher requirement to the monitoring of sea noise.
Tradition is main for detection of the acoustic pressure monitoring device of underwater noise mainly with piezoelectric type, condenser type, magneto-electric measuring principle, has non-linear, narrow bandwidth, especially in the low-band signal sensitivity shortcoming such as fast that descends.And low-frequency range is the main frequency range of modern marine ground unrest and target identification research, thereby adopts existing acoustic pressure monitoring device can not satisfy well the accurate monitoring requirement of marine background sound Compressive Strength.
Summary of the invention
The utility model has proposed a kind of marine background noise acoustic pressure signal monitoring equipment based on the laser interference principle, to improve the accuracy of detection to marine background noise sound pressure signal.
In order to solve the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of marine background noise acoustic pressure signal monitoring equipment comprises housing and is arranged at light path system, control system and electric power system in the housing; The left side of described housing or right openings are equipped with a vibrating reed with reflecting surface at described opening part, form an airtight chamber by described vibrating reed and housing, and the reflecting surface of vibrating reed are in chamber; In described chamber, be provided with a dividing plate with window, chamber is separated into left and right sides two parts, wherein the chamber at vibrating reed place is air chamber, be communicated with the air bag that is positioned at outside by pipeline, the another one chamber is the device chamber, lays the laser instrument in described control system, electric power system and the light path system, spectroscope, plane mirror and the photelectric receiver of half-transmitting and half-reflecting; The described spectroscope of described laser instrument Emission Lasers directive, reflect to form one road light beam as the described plane mirror of reference arm directive by described spectroscope, transmission forms another road light beam passes described window directive vibrating reed as gage beam reflecting surface; Two-way light beam by the reflection of described plane mirror and vibrating reed forms via spectroscope and injects described photelectric receiver after interfering, and then generates current output signal by photelectric receiver and transfer to controller in the control system; In described control system, also include piezoelectric ceramics, be installed on the described plane mirror, receive the voltage signal of controller output, utilize self deformation to drive plane mirror and move.
Preferably, two piezoelectric ceramics of preferred installation on described plane mirror, the modulation signal of a reception controller output is to be used for judging the deformation direction of vibrating reed; Another receives the bucking voltage of controller output, to follow the tracks of the deformation quantity of vibrating reed.
Further, described two piezoelectric ceramics are bonded together according to same polarised direction docking, are installed in the back side of described plane mirror.
Preferably, comprise A/D converter, D/A converter and CPU in described controller, the current output signal of described photelectric receiver output transfers to described CPU after A/D converter is transformed to digital signal; Described CPU outputs voltage signal to described piezoelectric ceramics by D/A converter.
Further again, a solenoid valve is installed in described pipeline, receive the switch controlling signal of controller output, under equipment, behind the water, open by controller control solenoid valve, keep the pressure in the air chamber consistent with extraneous hydraulic pressure.
Preferably, described window preferably adopts flat glass to be installed on the described dividing plate.
In order to reduce the volume of whole monitoring equipment, in described light path system, also include three catoptrons that tilt to lay, in described device chamber, the first catoptron and described laser instrument are installed in the top position, the second catoptron and described spectroscope are installed in the centre position, described the second catoptron and vibrating reed divide and are located at spectroscopical left and right sides, and lower position is installed the 3rd catoptron and described plane mirror; Described laser instrument along continuous straight runs Emission Lasers, inject the first catoptron with 45 ° of incident angles, the light beam that reflects to form vertical direction is injected the second catoptron with 45 ° of incident angles, and then inject spectroscope via the light beam that the second mirror reflects forms horizontal direction with 45 ° of incident angles, the first paragraph reference arm light beam that reflects to form vertical direction by spectroscope is injected the 3rd catoptron with 45 ° of incident angles, and then forms the second segment reference arm light beam of horizontal direction to the plane mirror of vertical laying via the 3rd mirror reflects; Described photelectric receiver is laid in spectroscopical top, receives the light of two bundle vertical incidence.
For the ease of the collection of interference pattern, between described the second catoptron and spectroscope, also be provided with a beam expander, the diameter of the laser beam that laser instrument is sent by described beam expander enlarges.
Further, in the indoor communication system that also is provided with of described device, connect described controller, the testing result that controller calculate is generated is uploaded to host computer and shows and store.
Preferably, described communication system preferably is connected communication by communication cable with host computer.
Compared with prior art, advantage of the present utility model and good effect are: marine background noise acoustic pressure signal monitoring equipment utilization Michelson Interference Principle of the present utility model carries out the structural design of light path system, vibration by vibrating reed induction marine background noise, and then the beam length as gage beam is changed, change thus the formed interference fringe of two-beam line that reflects and transmit by spectroscope, just can indirectly calculate by the variation that detects interference fringe thus the amplitude of marine background noise, and can further compensate the amplitude that calculates by the distance of regulating reference arm, to obtain more accurate acoustic pressure size.The monitoring equipment precision of design is high thus, the linearity is good, particularly undamped at low-band signal in the 0-10KHz scope, have good frequency response characteristic, and this monitoring equipment stable performance, measuring accuracy is subjected in the equipment impact of device sensitivity less, is easy to realize manufacturing integration.
After reading by reference to the accompanying drawings the detailed description of the utility model embodiment, other characteristics of the present utility model and advantage will become clearer.
Description of drawings
Fig. 1 is the one-piece construction synoptic diagram of the marine background noise acoustic pressure signal monitoring equipment that proposes of the utility model;
Fig. 2 is light path system and control system design principle schematic among Fig. 1;
Fig. 3 is the laying structure synoptic diagram of a kind of embodiment of light path system in acoustic pressure monitoring equipment housing;
Fig. 4 is that the center is the interference pattern synoptic diagram of speck;
Fig. 5 is the displacement waveform of vibrating reed interference fringe when being in original state and the synthetic coordinate diagram of current output signal;
Fig. 6 is the displacement waveform of interference fringe when moving in the vibrating reed and the synthetic coordinate diagram of current output signal;
Fig. 7 is the displacement waveform of vibrating reed interference fringe when moving outward and the synthetic coordinate diagram of current output signal.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in more detail.
Marine background noise acoustic pressure signal monitoring equipment of the present utility model designs based on Michelson Interference Principle, adopt the acoustic pressure of the method monitoring marine background noise of compensation, particularly be better than adopting at present the acoustic pressure monitoring equipment of piezoelectric type, condenser type, the design of magneto-electric measuring principle in sensitivity, stability, frequency response ability aspect the signal response ability of low-frequency range.
Below by a specific embodiment, elaborate concrete assembling structure and the principle of work thereof of described marine background noise acoustic pressure signal monitoring equipment.
Embodiment one, and referring to shown in Figure 1, the marine background noise acoustic pressure signal monitoring equipment of present embodiment mainly partly is comprised of housing 2 and light path system, control system, electric power system and the communication system etc. that are arranged in the described housing 2.Wherein, electric power system is used to described light path system, control system and communication system that operating voltage is provided; Communication system connects described control system, the acoustic pressure of the marine background noise that control system calculate is generated is uploaded to host computer on the bank, show in real time Monitoring Data by host computer to the staff, and finish the long-term of Monitoring Data and preserve continuously, transfer at any time the research and analysis of carrying out marine environment to make things convenient for the researchist.In the present embodiment, the preferred wire signal transmission mode that adopts is passed through communications cable connecting communication between described communication system and the host computer.The described communications cable can with the rope Integration Design that is used for transferring the acoustic pressure monitoring equipment together, transfer with described acoustic pressure monitoring equipment together with rope.Certainly, also communication system can be set in described acoustic pressure monitoring equipment, by memory device is set in control system, such as SD card or TF card etc. is to be used for preserving the ocean acoustic pressure data that monitor.After finishing the monitoring task, described acoustic pressure monitoring equipment is left the water, with memory device and computing machine connecting communication, realize the download output of Monitoring Data, transfer for the researchist.
For described light path system and control system, its design concept is referring to shown in Figure 2.
In the light path system of present embodiment, mainly comprise laser instrument 3, spectroscope 5, plane mirror 11, vibrating reed 1 and photelectric receiver 4 etc.Wherein, spectroscope 5 can be selected the light splitting eyeglass of half-transmitting and half-reflecting, is that 45 ° relation is obliquely installed according to acutangulating with surface level.In the left and right sides of spectroscope 5 correspondence laser instrument 3 and vibrating reed 1 are set.Described vibrating reed 1 is vertically mounted on the opening part of housing 2 one sides, and described opening can be opened in the left side of housing 2, as shown in Figure 2, also can be opened in the right side of housing 2, and then forms an airtight chamber by described vibrating reed 1 and housing 2.Miscellaneous part except vibrating reed 1 in described control system, communication system, electric power system and the light path system all is arranged in the described chamber, only by vibrating reed 1 contact seawater, the sound pressure variations of induction sea noise.In the present embodiment, described vibrating reed 1 is the vibrating reed with reflecting surface, and the mode that can adopt sputter coating process to form one deck reflectance coating on the surface of corrosion resistant plate designs realization, and with the reflecting surface of vibrating reed 1 spectroscope 5 towards chamber interior.Correspondence arranges described plane mirror 11 and photelectric receiver 4 in the up and down both sides of spectroscope 5, piezoelectric ceramics 9,10 is installed at the back side at plane mirror 11, by control piezoelectric ceramics 9,10 deformation, move to drive plane mirror 11, with the change in displacement of compensation vibration sheet 1.A kind of preferred design as present embodiment, preferably at the back side of described plane mirror 11 two piezoelectric ceramics 9,10 are installed, with two piezoelectric ceramics 9,10 carry out bonding according to the docking of same polarised direction after, be installed in again on the described plane mirror 11, utilize two piezoelectric ceramics 9, the common control that realizes plane mirror 11 displacements of 10 deformation.
In described control system, except comprising above-mentioned two piezoelectric ceramics 9,10, also be provided with controller.With described controller respectively with photelectric receiver 4 be connected two piezoelectric ceramics 9,10 corresponding connections, receive on the one hand the current signal of photelectric receiver 4 outputs, output voltage signal on the other hand two piezoelectric ceramics 9,10, to control two piezoelectric ceramics 9,10 deformation quantity.
As a kind of preferred design of present embodiment, described controller preferably adopts a cpu chip to cooperate an A/D converter and a D/A converter to set up and realizes, as shown in Figure 2.
Below in conjunction with light path system shown in Figure 2 and control system, the principle of work of the marine background noise acoustic pressure signal monitoring equipment that present embodiment is proposed is specifically addressed.
With the laser of laser instrument 3 emission as the described spectroscope 5 of light source directive.For the ease of the sampling of interference pattern, a beam expander 8 preferably further is installed again, as shown in Figure 2 between described laser instrument 3 and spectroscope 5.In the present embodiment, preferably adopting enlargement factor is that 10 times beam expander 8 carries out system, and the diameter of the laser beam after expanding can reach 5.4mm.Behind the laser process beam expander 8 that laser instrument 3 sends, the enlarged-diameter of light beam, the laser after expanding is two-way in spectroscope 5 punishment: the one tunnel for via the rear light beam S0 that forms of spectroscope 5 reflections, and it is defined as reference arm, and vertical sand shooting is to described plane mirror 4; Other one the tunnel for via the light beam S1 that forms after spectroscope 5 transmissions, and it is defined as gage beam, and vertical sand shooting is to the reflecting surface of described vibrating reed 1.Then, as the light beam S0 of reference arm via plane mirror 4 reflections after, the described spectroscope 5 of directive again, and by after described spectroscope 5 transmissions, impinging perpendicularly in the described photelectric receiver 4.As the light beam S1 of gage beam then after the reflecting surface reflection via vibrating reed 1, the described spectroscope 5 of directive again, and by after described spectroscope 5 reflections, impinge perpendicularly in the described photelectric receiver 4.The two-way light beam that is injected into described photelectric receiver 4 converges at photelectric receiver 4 places, form interference pattern, as shown in Figure 4, photelectric receiver 4 generates corresponding with it current output signal according to the light intensity that receives, carry out simulating signal after the conversion process of digital signal via A/D converter, export described cpu chip to.
When vibrating reed 1 is subject to ambient pressure, deformation can occur, thereby changes the length of gage beam, cause that interference fringe changes.This variation that present embodiment just is being based on interference fringe calculates the deformation quantity of vibrating reed 1 indirectly, and then converses the intensity of ambient pressure.
Consider when transferring to described sound pressure signal monitoring equipment in the water, different according to the residing depth of water of equipment, the hydraulic pressure that its equipment is subject to also can be different, this will cause when not having noise contributions to the vibrating reed 1, deformation has occured in vibrating reed 1 under the effect of hydraulic pressure, so that interference fringe has departed from original state.For when not having noise contributions to the vibrating reed 1, interference fringe still can remain on original state, with convenient follow-up acoustic pressure computation process, present embodiment preferably is separated out a sealed gas chamber A in described housing 2 and vibrating reed 1 formed airtight chamber, such as Fig. 1, shown in Figure 3.Described air chamber A can adopt the mode that a dividing plate 17 is set in airtight chamber that chamber is separated into left and right sides two parts, and wherein, the chamber at vibrating reed 1 place is air chamber A, and the another one chamber is device chamber B.At described dividing plate 17 window 16 is set, to avoid stopping the normal transmission of light.In the present embodiment, the described window 16 preferred flat glasss that adopt are made, the gage beam light beam S1 that transmits by spectroscope 5 is by the reflecting surface of described window 16 directive vibrating reeds 1, light beam via the reflecting surface emission also can return spectroscope 5 by described window 16, to satisfy the normal transmission requirement of light path.Air bag 13 of outer setting at described housing 2, be communicated with described air chamber A by pipeline 14, in described pipeline 14, solenoid valve 15 can also be set further, be electrically connected on described controller, specifically connect described cpu chip by D/A converter, receive the switch controlling signal of CPU output, with control solenoid valve 15 conductings or shutoff.
Under the sound pressure signal monitoring equipment before the water, the pressure of vibrating reed 1 inside and outside both sides is atmospheric pressure P0, at this moment, vibrating reed 1 is undeformed, controller control solenoid valve 15 cuts out, by light path system is carried out preconditioning, so that the interference pattern that described photelectric receiver 4 receives just is adjusted to the original state of setting.After the entry of sound pressure signal monitoring equipment, along with the continuous variation of the depth of water, vibrating reed 1 can produce deformation thereupon.Arrive the depth of water position of appointment when the equipment entry after, extraneous hydraulic pressure is P1, and the pressure in the air chamber A is P0, and P1〉P0, vibrating reed 1 deformation in the chamber.By controller opens solenoid valve 15, air chamber A is communicated with air bag 13.Because air bag 13 also is positioned at the identical degree of depth under water, so deformation also can occur in air bag 13, and pressure becomes P1.Because air chamber A is communicated with air bag 13, so the pressure in the air chamber A also can become P1.At this moment, the outer side hydraulic pressure that vibrating reed 1 is subject to is P1, and the pressure in the air chamber A also is P1, and vibrating reed 1 returns to original state, and is namely undeformed.Thus just can be so that interference pattern return to original state again, when only having under water noise contributions to the vibrating reed 1, deformation just can occur in vibrating reed 1 again.At this moment, the pressure that calculates according to the deformation quantity of vibrating reed 1 is the pressure of marine background noise.
Other device except vibrating reed 1 in described control system, electric power system, communication system and the light path system is laid in the described device chamber B, such as Fig. 1, shown in Figure 3, with the global design of finishing equipment.
For the direction of vibration of vibrating reed 1 is judged, and the displacement of compensation vibration sheet 1, present embodiment adopts a piezoelectric ceramics 9(be can be described as the first piezoelectric ceramics) apply the periodically mode of the voltage modulation signal of sinusoidal variations, control 9 concussions of the first piezoelectric ceramics, to form the modulation of light signal, realize the accurate judgement to vibrating reed 1 direction of vibration.Specifically can cooperate the D/A converter generation and export described voltage modulation signal by cpu chip, act on the first piezoelectric ceramics 9, to control its concussion.10(can be described as the second piezoelectric ceramics for the another one piezoelectric ceramics), then can cooperate the D/A converter generation and export suitable bucking voltage by the deformation quantity of cpu chip according to vibrating reed 1, be applied on the second piezoelectric ceramics 10, with the variation of compensating measure arm.Then, cpu chip just can calculate the deformation quantity of the second piezoelectric ceramics 10 according to the bucking voltage value of its output, i.e. the deformation quantity of vibrating reed 1, and then indirectly converse the sound pressure level of tested marine background noise according to the deformation quantity of vibrating reed 1.
The below is specifically addressed respectively the sound pressure amplitudes measuring process of the nyctitropic deterministic process of vibrating reed 1 shape and marine background noise.
(1) the nyctitropic judgement of vibrating reed shape
At first, described acoustic pressure monitoring equipment is carried out initialization, by light path system is carried out preconditioning, make described photelectric receiver 4 just can detect the bright spot of view-field center of interference pattern, be i.e. as shown in Figure 4 interference fringe.
Secondly, the acoustic pressure monitoring equipment is put under water, started the acoustic pressure monitoring equipment and enter normal operating conditions, CPU cooperates D/A converter output modulation signal to drive 9 concussions of the first piezoelectric ceramics, and light signal is modulated.When there is voice signal in detected waters, when sound wave arrives vibrating reed 1, just cause vibrating reed 1 vibration, thereby change the distance of gage beam S1, make interference fringe produce corresponding the variation.
Then, CPU receives the current output signal i that photelectric receiver 4 produces by A/D converter
PD, and in conjunction with the modulation signal i of CPU output
0Waveform judge the direction of vibration of vibrating reed 1, in conjunction with Fig. 5 to shown in Figure 7.Fig. 5 to Fig. 7 is the synthetic coordinate diagram of interference fringe displacement and curent change, and wherein, I represents that light intensity, Δ x represent interference fringe displacement, i
PDCurrent output signal, i that expression photelectric receiver 4 produces
0The current modulated that expression is corresponding with the voltage modulation signal of CPU output.Concrete deterministic process is as follows:
The current value of (when the modulation signal of CPU output is minimum value) photelectric receiver 4 outputs when the current value=modulation signal of (when the modulation signal of CPU output is maximal value) photelectric receiver 4 outputs was in trough when if modulation signal was in crest, i.e. as shown in Figure 5 oscillogram, represent that then deformation does not occur vibrating reed 1, do not have noise contributions on vibrating reed 1.At this moment, CPU need not to export bucking voltage.
The current value of photelectric receiver 4 outputs when the current value＜modulation signal of photelectric receiver 4 output was in trough when if modulation signal was in crest, namely as shown in Figure 6 waveform represents that then vibrating reed 1 to the direction of contract measurement arm S1 deformation has occured.At this moment, CPU need to export bucking voltage, control the second piezoelectric ceramics 10 to the direction deformation of dwindling reference arm S0, and then drive plane mirror 11 moves to the direction of dwindling reference arm S0, with the variation of compensating measure arm S1, until described photelectric receiver 4 detects the bright spot of view-field center of interference pattern again.
The current value of photelectric receiver 4 output when if modulation signal is in crest〉current value of photelectric receiver 4 outputs when modulation signal is in trough, namely as shown in Figure 7 waveform represents that then vibrating reed 1 to the direction that increases gage beam S1 deformation has occured.At this moment, CPU need to export bucking voltage and control the second piezoelectric ceramics 10 to the direction deformation that increases reference arm S0, and then drive plane mirror 11 moves to the direction that increases reference arm S0, with the variation of compensating measure arm S1, until described photelectric receiver 4 detects the bright spot of view-field center of interference pattern again.
(2) measurement of sound pressure amplitudes
Present embodiment is controlled 10 deformation of the second piezoelectric ceramics by bucking voltage of controller output, following the tracks of the deformation quantity of vibrating reed 1, and then calculates the amplitude of sea noise according to the size of the bucking voltage of controller output.Concrete grammar is: the bucking voltage U that cooperates an analog quantity of D/A converter output by CPU
Cmp, with this bucking voltage U
CmpAfter amplifying processing, be applied to the second piezoelectric ceramics 10, control the second piezoelectric ceramics 10 deformation occur, and then drive plane mirror 11 moves, make interference fringe mobile in the other direction, with the variation of compensating measure arm S1, until the interference pattern that photelectric receiver 4 detects returns to original state.Be the bright spot of view-field center that photelectric receiver 4 detects interference pattern again in the present embodiment.
Known control the second piezoelectric ceramics 10 deformation amplitudes are
The voltage that Time Controller need to be exported is U, and wherein, λ is the wavelength of the laser of laser instrument 3 emissions, then has:
Wherein,
Be controller output bucking voltage U
CmpThe time the second piezoelectric ceramics 10 the deformation amplitude, then the offset of oscillating component is:
The amplitude that is the marine background noise is
At this moment, in conjunction with the intensity of vibrating reed 1, just can converse the pressure size of marine background noise, determine corresponding sound pressure level.If select 8 D/A converter, then can be with bucking voltage U
CmpBe sub-divided into optical maser wavelength
, to improve accuracy of detection.
In order to dwindle the overall dimensions of described acoustic pressure monitoring equipment, present embodiment preferably adopts as shown in Figure 3 laying structure to the laying mode of described light path system in the B of device chamber.Namely in described light path system, increase by three catoptrons 6,7,12, to change the transmission path of laser beam.Specifically, in described device chamber B, preferably laser instrument 3 and the first catoptron 6 are installed in the top position; The second catoptron 7 and described spectroscope 5 are installed in the centre position, and described the second catoptron 7 should be located at vibrating reed the left and right sides of spectroscope 5 in 1 minute; Lower position is installed the 3rd catoptron 12 and described plane mirror 11.Be that 45 ° relation tilt to be laid with described three catoptrons 6,7,12 according to acutangulating with surface level, referring to laying mode shown in Figure 3.Thus one, by the laser along continuous straight runs transmission of laser instrument 3 emissions, and inject the first catoptron 6 with 45 ° of incident angles, and then reflect to form the light beam of vertical direction via the first catoptron 6, then inject the second catoptron 7 with 45 ° incident angle; After the light beam that reflects to form by the second catoptron 7 expands via beam expander 8, the along continuous straight runs transmission, and then inject spectroscope 4 with 45 ° incident angle, reflect to form the first paragraph reference arm light beam S0-1 of vertical direction by spectroscope 4, and inject the 3rd catoptron 12 with 45 ° of incident angles, and then reflect to form the second segment reference arm light beam S0-2 of horizontal direction, the vertical plane mirror 11 of laying of directive via the 3rd catoptron 12.The length addition of two sections reference arm light beams is the length of S0.Described photelectric receiver 4 levels are laid in the top of spectroscope 5, so that the two-beam line of directive photelectric receiver 4 can impinge perpendicularly in the photosensitive Receiver of photelectric receiver 4, to form desirable interference pattern.Adopt this design, can realize effectively control to length and the width of housing 2, and then the Miniaturization Design of convenient whole equipment.
As a kind of preferred profile design proposal of present embodiment, the housing 2 of described acoustic pressure monitoring equipment can be designed to cylindricly, and described vibrating reed 1 is designed to circle, with suitable with the port of housing 2 cylindraceous.The described vibrating reed 1 preferred larger material of rigidity that adopts is made, such as corrosion resistant plate etc., so that the acoustic pressure monitoring equipment can bear the larger deep-marine-environment of pressure, even place 500 meters deep-marine-environment also can work.Certainly, present embodiment is not limited in above giving an example.
Adopt the acoustic pressure monitoring equipment of present embodiment, compare traditional acoustic pressure monitoring device and have following significant advantage:
(1) precision is high, and the linearity is good, and is particularly undamped at low-band signal in 0 ~ 10kHz scope, has good frequency response characteristic;
(2) stable performance, measuring accuracy are subjected in the equipment impact of device sensitivity less, are easy to realize manufacturing integration;
(3) good airproof performance can be 500 meters even darker underwater environment normal operation.
Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and the variation that those skilled in the art make in essential scope of the present utility model, remodeling, interpolation or replacement also should belong to protection domain of the present utility model.
Claims (10)
1. marine background noise acoustic pressure signal monitoring equipment is characterized in that: comprise housing and be arranged at light path system, control system and electric power system in the housing; The left side of described housing or right openings are equipped with a vibrating reed with reflecting surface at described opening part, form an airtight chamber by described vibrating reed and housing, and the reflecting surface of vibrating reed are in chamber; In described chamber, be provided with a dividing plate with window, chamber is separated into left and right sides two parts, wherein the chamber at vibrating reed place is air chamber, be communicated with the air bag that is positioned at outside by pipeline, the another one chamber is the device chamber, lays the laser instrument in described control system, electric power system and the light path system, spectroscope, plane mirror and the photelectric receiver of half-transmitting and half-reflecting; The described spectroscope of described laser instrument Emission Lasers directive, reflect to form one road light beam as the described plane mirror of reference arm directive by described spectroscope, transmission forms another road light beam passes described window directive vibrating reed as gage beam reflecting surface; Two-way light beam by the reflection of described plane mirror and vibrating reed forms via spectroscope and injects described photelectric receiver after interfering, and then generates current output signal by photelectric receiver and transfer to controller in the control system; In described control system, also include piezoelectric ceramics, be installed on the described plane mirror, receive the voltage signal of controller output, utilize self deformation to drive plane mirror and move.
2. marine background noise acoustic pressure signal monitoring equipment according to claim 1 is characterized in that: at described plane mirror two piezoelectric ceramics are installed.
3. marine background noise acoustic pressure signal monitoring equipment according to claim 2 is characterized in that: described two piezoelectric ceramics are bonded together according to same polarised direction docking, are installed in the back side of described plane mirror.
4. marine background noise acoustic pressure signal monitoring equipment according to claim 1, it is characterized in that: comprise A/D converter, D/A converter and CPU in described controller, the current output signal of described photelectric receiver output transfers to described CPU after A/D converter is transformed to digital signal; Described CPU outputs voltage signal to described piezoelectric ceramics by D/A converter.
5. marine background noise acoustic pressure signal monitoring equipment according to claim 1 is characterized in that: a solenoid valve is installed in described pipeline, receives the switch controlling signal of controller output.
6. marine background noise acoustic pressure signal monitoring equipment according to claim 1, it is characterized in that: described window is flat glass.
7. each described marine background noise acoustic pressure signal monitoring equipment in 6 according to claim 1, it is characterized in that: in described light path system, also include three catoptrons that tilt to lay, in described device chamber, the first catoptron and described laser instrument are installed in the top position, the second catoptron and described spectroscope are installed in the centre position, described the second catoptron and vibrating reed divide and are located at spectroscopical left and right sides, and lower position is installed the 3rd catoptron and described plane mirror; Described laser instrument along continuous straight runs Emission Lasers, inject the first catoptron with 45 ° of incident angles, the light beam that reflects to form vertical direction is injected the second catoptron with 45 ° of incident angles, and then inject spectroscope via the light beam that the second mirror reflects forms horizontal direction with 45 ° of incident angles, the first paragraph reference arm light beam that reflects to form vertical direction by spectroscope is injected the 3rd catoptron with 45 ° of incident angles, and then forms the second segment reference arm light beam of horizontal direction to the plane mirror of vertical laying via the 3rd mirror reflects; Described photelectric receiver is laid in spectroscopical top, receives the light of two bundle vertical incidence.
8. marine background noise acoustic pressure signal monitoring equipment according to claim 7 is characterized in that: also be provided with a beam expander between described the second catoptron and spectroscope, the diameter of the laser beam that laser instrument is sent by described beam expander enlarges.
9. each described marine background noise acoustic pressure signal monitoring equipment in 6 according to claim 1, it is characterized in that: in the indoor communication system that also is provided with of described device, connect described controller, the testing result that controller calculate is generated is uploaded to host computer and shows and store.
10. marine background noise acoustic pressure signal monitoring equipment according to claim 9, it is characterized in that: described communication system is connected communication by communication cable with host computer.
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| CN 201220225285 CN202676278U (en) | 2012-05-18 | 2012-05-18 | A sound pressure signal monitoring device of ocean background noise |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108327854A (en) * | 2017-12-29 | 2018-07-27 | 中国船舶重工集团公司第七0研究所 | A kind of drift anchor system buoy for detecting underwater sound signal |
| CN111272430A (en) * | 2020-04-13 | 2020-06-12 | 合肥工业大学 | Bearing vibration measuring device based on optical interference principle and measuring method thereof |
| CN111829648A (en) * | 2020-07-23 | 2020-10-27 | 中国电子科技集团公司第四十九研究所 | Piezoelectric noise sensor probe |
| CN113296137A (en) * | 2020-02-24 | 2021-08-24 | 香港理工大学深圳研究院 | Interferometric deformation monitoring method and device and receiver |
-
2012
- 2012-05-18 CN CN 201220225285 patent/CN202676278U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108327854A (en) * | 2017-12-29 | 2018-07-27 | 中国船舶重工集团公司第七0研究所 | A kind of drift anchor system buoy for detecting underwater sound signal |
| CN113296137A (en) * | 2020-02-24 | 2021-08-24 | 香港理工大学深圳研究院 | Interferometric deformation monitoring method and device and receiver |
| CN113296137B (en) * | 2020-02-24 | 2023-11-17 | 香港理工大学深圳研究院 | Interference type deformation monitoring method, device and receiver |
| CN111272430A (en) * | 2020-04-13 | 2020-06-12 | 合肥工业大学 | Bearing vibration measuring device based on optical interference principle and measuring method thereof |
| CN111829648A (en) * | 2020-07-23 | 2020-10-27 | 中国电子科技集团公司第四十九研究所 | Piezoelectric noise sensor probe |
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