CN104539299B - Small-sized underwater low-frequency acoustic transmitter - Google Patents
Small-sized underwater low-frequency acoustic transmitter Download PDFInfo
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- CN104539299B CN104539299B CN201410564269.2A CN201410564269A CN104539299B CN 104539299 B CN104539299 B CN 104539299B CN 201410564269 A CN201410564269 A CN 201410564269A CN 104539299 B CN104539299 B CN 104539299B
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Abstract
The invention discloses an underwater low-frequency acoustic transmitter, and belongs to the technical field of hydroacoustic survey. The transmitter comprises a signal generating circuit, a power amplifying circuit, a magneto-electric flextensional transducer and a battery pack, wherein the signal generating circuit comprises a band-limited noise signal generator circuit for generating a band limited noise signal and a digital signal generator circuit for generating a sinusoidal single-frequency signal, a frequency-modulated signal and a sweeping frequency signal; the power amplifying circuit comprises two integrated power operational amplifiers constructing a non-inverting amplifier and an inverting amplifier respectively which are connected to the positive/negative input ends of the magneto-electric flextensional transducer; the battery pack is used for supplying power to the signal generating circuit and the power amplifying circuit. The signal generating circuit is used for generating a low-frequency sinusoidal signal, the frequency-modulated signal, the sweeping frequency signal or the band-limited noise signal. After the signals are amplified by the power amplifying circuit, the magneto-electric flextensional transducer is driven to transform electric energy into mechanical energy, and the mechanical energy is emitted in the form of sound waves.
Description
Technical field
The present invention relates to a kind of device being applied to low-frequency acoustic signal transmitting under water, it is Hydroacoustic survey technical field.
Background technology
In Hydroacoustic survey, low-frequency sound source is conventional underwater installation, and by signal generator, power amplifier with low
The conventional subsea acoustical signal emission system that the standard universal underwater sound equipment such as frequency transducer is constituted, not only volume, weight are larger, to making
User makes troubles, and this kind of common apparatus need external ac power source to power, when external water area so out of office is tested, past
Toward needing generating equipment to provide external power source, and the vibration of generating equipment and radiated noise travel under water, again can be under contaminant water
The useful acoustical signal of test source emission, brings unexpected interference to process of the test.
In some cases, in Lake trial with sea trial it is desirable to the continuous working period of underwater emission sound source simultaneously
Not long.Often only need to the continuous transmitting in several tens minutes.And Modern Small lithium battery group or fuel cell unit are when such
Between be fully able to provide stable running voltage and electric current in section；The small signal that is made up of monolithic integrated optical circuit occur circuit with
Power amplification circuit, the power signal of generation drives magneto-electric flextensional transducer it becomes possible to launch high sound source at short notice
The low frequency underwater signal of level.
Content of the invention
In view of this, the invention provides a kind of small underwater frequency acoustic emitter, its objective is for lake, sea water sound
The shorter feature of the actual continuous working period of underwater sound source in engineering test, using battery-powered and by adopting integrated level
Higher digit chip realizes Miniaturization Design with simulation integrated chip so that the signal generating circuit of miniaturization and power amplification
Circuit completes the function of conventional all purpose instrument, reduces use, the complexity of maintenance aspect, reduces to external ac power source simultaneously
Dependence, it is to avoid the interference of introducing external noise.
For reaching above-mentioned purpose, the technical scheme is that this kind of small underwater frequency acoustic emitter, including signal
There is circuit, power amplification circuit, magnetoelectricity flextensional transducer and set of cells.
Signal generating circuit includes band limited noise signal generator circuit and digital signal generator circuit two parts；Limit band
Noise signal generator circuit produces broadband exchange using Zener diode and makes an uproar when reaching Zener voltage, being operated in avalanche condition
Acoustical signal, this broadband AC noise signal, after amplification and bandpass filtering, forms band limited noise signal；Digital signal produces
Circuit is by the frequency control word of Single-chip Controlling Direct Digital Frequency Synthesizers dds chip, produces sinusoidal simple signal, frequency modulation
Signal and swept-frequency signal.
Power amplification circuit includes by two panels integrated power operational amplifier, and respectively positive amplifier is amplified with reverse
Device, the normal phase input end of positive amplifier and the inverting input of sign-changing amplifier, respectively as two inputs of transmission signal
Port, the outfan out+ of positive amplifier connects to the positive input terminal of magnetoelectricity flextensional transducer, the outfan of sign-changing amplifier
Out- connects to the negative input end of magnetoelectricity flextensional transducer.
It is signal generating circuit that set of cells is used for and power amplification circuit is powered.
After this acoustic transmitter connects set of cells, signal generating circuit produces low sine, frequency modulation, swept-frequency signal or limit band and makes an uproar
Acoustical signal, signal, after the amplification of power amplification circuit, drives magnetoelectricity flextensional transducer, converts electrical energy into mechanical energy, with
The form of sound wave is launched.
Further, band limited noise signal generator circuit specifically include Zener diode circuit, positive amplifying circuit and
Multichannel negative feedback type band filter.
Zener diode circuit includes two Zener diodes, the respectively first Zener diode d1 and the second Zener two pole
Pipe d2, four resistance, respectively first resistor r1, second resistance r2,3rd resistor r3 and the 4th resistance r4, two audions,
It is respectively the first audion q1 and the second audion q2, four electric capacity, the respectively first electric capacity c1, the second electric capacity c2, the 3rd electricity
Hold c3 and the 4th electric capacity c4, and powered using 24v supply voltage；The colelctor electrode of the wherein first audion q1 is connected by resistance r3
To 24v supply voltage, the emitter stage of the first audion q1 is grounded by resistance r2, and the base stage of q1 connects the first Zener diode d1
Positive pole, the negative pole one side of d1 is connected to 24v supply voltage by resistance r1 and r3, is on the other hand grounded by electric capacity c1；
The colelctor electrode of the second audion q2 is connected to 24v supply voltage by 3rd resistor r3, and the emitter stage of the second audion q2 passes through
Second electric capacity c2 ground connection, the base stage of the second audion q2 connects the positive pole of the second Zener diode d2, and the negative pole of d2 is on the one hand logical
Cross the 4th resistance r4 and 3rd resistor r3 connects to 24v supply voltage, on the other hand pass through the 4th electric capacity c4 ground connection；One or three pole
The emitter stage of pipe q1 and the second audion q2 is joined directly together；The positive pole of the 3rd electric capacity c3 is connected to 24v electricity by 3rd resistor r3
Source voltage, the negative pole of the 3rd electric capacity c3 is as the outfan of Zener diode circuit.
The outfan of Zener diode circuit connects to the positive input terminal of positive amplifying circuit；Positive amplifying circuit is by computing
Amplifier tlc2262 and its peripheral circuit composition；The outfan of positive amplifying circuit connects multichannel negative feedback type band filter
Input.
Further, digital signal produces in circuit, and the Direct Digital Frequency Synthesizers dds chip being adopted is
Ad9852, the single-chip microcomputer being adopted is msp430f1612 single-chip microcomputer.
Further, positive amplifier is made up of the chip u2 of model opa512 and its peripheral circuit, sign-changing amplifier
It is made up of the chip u3 and its peripheral circuit of model opa512；
The peripheral circuit of chip u2 also includes the first current-limiting resistance r59, the second current-limiting resistance r61, the 3rd current-limiting resistance r63
With the 4th current-limiting resistance r64, impedance matching resistor r62, first amplify control resistance r58 and second amplify control resistance r60, the
Three audion q13 and the 4th audion q14, the first diode d4 and the second diode d5；
Chip u2 with the annexation of device each in peripheral circuit is: No. 4 pins of chip u2 are grounded by resistance r62,
No. 5 pins of chip u2 are grounded by resistance r58, and No. 3 pins of chip u2 are connected to+24v supply voltage by resistance r59,
No. 2 pins of chip u2 are connected by the second current-limiting resistance r61 to No. 1 pin of chip u2, and the 3rd audion q13 ties for pnp
Structure, the base stage of the 3rd audion q13 connects to No. 3 pins of chip u2, and the colelctor electrode of the 3rd audion q13 connects to chip u2
No. 1 pin, the emitter stage of the 3rd audion q13 connects to+24v supply voltage；No. 1 pin of chip u2 connects the one or two pole
The positive pole of pipe d4, the negative pole of the first diode d4 connects to+24v supply voltage, and No. 1 pin of chip u2 passes through second and amplifies control
Resistance r60 processed and first amplifies and controls resistance r58 ground connection；No. 6 pins of chip u2 by the 4th current-limiting resistance r64 connect to-
24v supply voltage, No. 8 pins of chip u2 are connected by the 3rd current-limiting resistance r63 to No. 1 pin of chip u2, the four or three pole
Pipe q14 is npn structure, and the base stage of the 4th audion q14 connects to No. 6 pins of chip u2, the colelctor electrode of the 4th audion q14
Connect to No. 1 pin of chip u2, the emitter stage of the 4th audion q14 connects to -24v supply voltage；No. 1 pipe by chip u2
Foot draws the outfan out+ of positive amplifier；The amplification of the positive amplifier of chip u2 and its peripheral circuit composition is k1
=1+r60/r58；
The peripheral circuit of chip u3 also includes the 5th current-limiting resistance r65, the 6th current-limiting resistance r67, the 7th current-limiting resistance r70
With the 8th current-limiting resistance r71, impedance matching resistor r69, the 3rd amplify control resistance r68 and the 4th amplify control resistance r66, the
Five audion q15 and the 6th audion q16, the 3rd diode d6 and the 4th diode d7；
Chip u3 with the annexation of device each in peripheral circuit is: No. 4 pins of chip u3 pass through impedance matching resistor
R69 is grounded, and No. 5 pins of chip u3 pass through the 3rd and amplify control resistance r68 ground connection, and No. 3 pins of chip u3 pass through the 5th and limit
Leakage resistance r65 connects to+24v supply voltage, and No. 2 pins of chip u3 are connected to the 1 of chip u3 by the 6th current-limiting resistance r67
Number pin, the 5th audion q15 is pnp structure, and the base stage of the 5th audion q15 connects to No. 3 pins of chip u3, the five or three
The colelctor electrode of pole pipe q15 connects to No. 1 pin of chip u3, and the emitter stage of the 5th audion q15 connects to+24v supply voltage；
No. 1 pin of chip u3 connects the positive pole of the 3rd diode d6, and the negative pole of the 3rd diode d6 connects to+24v supply voltage, core
No. 1 pin of piece u3 passes through the 4th and amplifies control resistance r66 and the 3rd amplification control resistance r68 ground connection；No. 6 pins of chip u3
Connected to -24v supply voltage by the 8th current-limiting resistance r71, No. 8 pins of chip u2 pass through the 7th current-limiting resistance r70 and connect
To No. 1 pin of chip u3, the 6th audion q16 is npn structure, and the base stage of the 6th audion q16 connects to No. 6 of chip u3
Pin, the colelctor electrode of the 6th audion q16 connects to No. 1 pin of chip u3, the emitter stage of the 6th audion q16 connect to-
24v supply voltage；The outfan out- of sign-changing amplifier is drawn by No. 1 pin of chip u3；Chip u3 and its peripheral circuit group
The amplification of the sign-changing amplifier becoming is k2=-r66/r68.
Further, the material of the vibrating mass of magnetoelectricity flextensional transducer is to have the rare earth material of magnetostrictive effect characteristic
Material.
Further, the intensive lithium ion battery of battery power or fuel cell.
Beneficial effect:
(1) the present invention seeks to for lake, sea water acoustic engineering test in the actual continuous working period of underwater sound source shorter
Feature, realizes miniaturization and sets with simulation integrated chip using battery-powered and by the digit chip higher using integrated level
Meter, so that the signal generating circuit of miniaturization and power amplification circuit complete the function of conventional all purpose instrument, reduces and uses, safeguards
The complexity of aspect, reduce the dependence to external ac power source simultaneously, it is to avoid the interference of introducing external noise.
(2), be directed to these situations, the present invention uses batteries as the energy, 1) single-chip microcomputer and integrated dds (direct frequency
Synthesis chip) signal generator chip, produce sinusoidal single-frequency, frequency modulation or swept-frequency signal.2) reach Zener using Zener diode
Voltage, is operated in the broadband noise signal producing during " snowslide " state, forms band limited noise letter after band-pass filter
Number.Both the above functional module constitutes signal generating circuit；Amplified by the small-sized half-bridge power that integrated power amplifier is constituted
Circuit, the signal of telecommunication is carried out after power amplification, drives magneto-electric flextensional transducer, and the signal of telecommunication is changed into acoustical signal, just realizes
String single-frequency, frequency sweep, the function of band limited noise signal transmitting, reduce the system scale of conventional subsea sound source, are allowed to miniaturization and reach
Purpose to convenient use.
(3), Zener diode is operated under " snowslide " state, can by characteristic in certain numerical value for the DC voltage stability,
But now necessarily supervene the AC noise in broadband, but now necessarily supervene the AC noise in broadband, in present invention electricity
Lu Zhong, the broadband AC noise supervened is amplified as useful signal, by band filter under " snowslide " state
Form band limited noise signal afterwards, and DC voltage is in outside the passband of band filter, then be filtered out.In circuit of the present invention
It is simultaneously used two Zener diodes so that the AC noise signal producing is superimposed, improve noise signal strength；This
The method adopting analog circuit to produce broadband noise in invention, has evaded in conventional method and has entered line frequency using digital circuit
The complex hardware circuit of synthesis, circuit structure is simple, component number is few, low in energy consumption；And the bandwidth of noise signal is just by carrying
The free transmission range of bandpass filter, to determine, therefore can adjust band limited noise by adjusting the free transmission range of band filter
The bandwidth of signal, circuit stability is high, debugging is simple and convenient.
Brief description
Fig. 1 small underwater frequency acoustic ejector system block diagram；
Fig. 2 band limited noise signal generator circuit；
Fig. 3 digital signal generator circuit；
Fig. 4 power amplification circuit schematic diagram.
Specific embodiment
Develop simultaneously embodiment below in conjunction with the accompanying drawings, describes the present invention.
Present embodiments provide a kind of small underwater frequency acoustic emitter, its system block diagram is as shown in figure 1, this emitter
Including signal generating circuit, power amplification circuit, magnetoelectricity flextensional transducer and set of cells.
Signal generating circuit
Signal generating circuit includes band limited noise signal generator circuit and digital signal generator circuit two parts.
1), band limited noise signal generator circuit
Band limited noise signal generator circuit is produced when reaching Zener voltage, being operated in avalanche condition using Zener diode
Raw broadband AC noise signal, this broadband AC noise signal, after amplification and bandpass filtering, forms band limited noise signal.
It is illustrated in figure 2 band limited noise signal generator circuit, as seen from Figure 2 band limited noise signal generator electricity in the present embodiment
Road specifically includes Zener diode circuit, the first positive amplifying circuit and multichannel negative feedback type band filter.
Zener diode circuit includes two Zener diode d1 and d2, four resistance r1, r2, r3 and r4, two three poles
Pipe q1 and q2, four electric capacity c1, c2, c3 and c4, and powered using 24v supply voltage.
Wherein the colelctor electrode of audion q1 is connected to 24v supply voltage by resistance r3, and the emitter stage of q1 passes through resistance r2
Ground connection, the base stage of q1 connects the positive pole of Zener diode d1, and the negative pole one side of d1 is connected to 24v power supply by resistance r1 and r3
Voltage, is on the other hand grounded by electric capacity c1.
The colelctor electrode of audion q2 is connected to 24v supply voltage by resistance r3, and the emitter stage of q2 is grounded by electric capacity c2,
The base stage of q2 connects the positive pole of Zener diode d2, and the negative pole one side of d2 is connected to 24v supply voltage by resistance r4 and r3,
On the other hand it is grounded by electric capacity c4.
The emitter stage of audion q1 and q2 is joined directly together.
The positive pole of electric capacity c3 is connected to 24v supply voltage by resistance r3, and the negative pole of electric capacity c3 is as Zener diode electricity
The outfan on road.
The outfan of Zener diode circuit connects to the positive input terminal of positive amplifying circuit.
The common usage of Zener diode is to use as stabilivolt, is to make use of Zener diode to be operated in " snowslide " shape
Under state, by characteristic in certain numerical value for the DC voltage stability, but now can necessarily supervene the AC noise in broadband, but this
Shi Biran supervenes the AC noise in broadband, and when using as stabilivolt, the DC voltage of generation is useful, and exchange is made an uproar
Sound is useless, needs the part that is filtered out.But in circuit of the present invention, the usage of Zener diode is just the opposite, will " snow
Collapsing " the broadband AC noise supervened under state is amplified as useful signal, forms limit band after band filter
Noise signal, and DC voltage is in outside the passband of band filter, then be filtered out.
It is simultaneously used two Zener diodes in circuit so that the AC noise signal producing is superimposed, improve
Noise signal strength；It is operated in the method supervening broadband AC noise under " snowslide " state using Zener diode, and neat
Receive diode common usage just the opposite, the method that this kind of employing analog circuit produces broadband noise, evaded routine
Carry out the complex hardware circuit of frequency synthesis using digital circuit, circuit structure is simple, component number is few, power consumption in method
Low.
Positive amplifying circuit is made up of operational amplifier tlc2262 and its peripheral circuit.
The outfan of positive amplifying circuit connects the input of multichannel negative feedback type band filter.
Wherein d1, d2 use Zener diode 2cw107, when additional backward voltage is more than 9.5v, reach diode
The breakdown reverse voltage of 2cw107, from the E-I characteristic of Zener diode, is at this moment in avalanche breakdown work shape
State, produces broadband continuous noise signal.And resistance r1, r2, r3, r4, play the effect of 24v source voltage and current limliting,
Make to be added in and be maintained at more than 9.5v on Zener diode d1, d2；Electric capacity c1, c2 play the effect that energy storage and voltage keep, electricity
Hold the effect that c3, c25, c27 play DC voltage isolation；The transistor model that audion q1, q2 adopt is 2n3904, by noise
Signal is amplified；Operational amplifier tlc2262 (n5a) constitutes positive amplifying circuit, on the one hand puts noise signal further
Greatly, on the other hand play the effect of impedance matching, make noise signal smoothly be input to subordinate's circuit；Operational amplifier tlc2262
(n5b) resistance r41, r43, r45 with periphery, electric capacity c23, c26 constitute multichannel negative feedback type band filter, and free transmission range is
The low-frequency range of 50hz～1000hz, wide noise signal is changed into band limited noise signal.
It is operated under " snowslide " state using Zener diode and supervenes broadband AC noise, then pass through band filter
Form band limited noise signal afterwards, the bandwidth of noise signal just to be determined by the free transmission range of band filter, therefore can pass through
The free transmission range of adjustment band filter, to adjust the bandwidth of band limited noise signal, and circuit stability is high, debugging is simple and convenient.
2), digital signal produces circuit
It is by the frequency control word of Single-chip Controlling Direct Digital Frequency Synthesizers dds chip that digital signal produces circuit,
Produce single frequency sinusoidal, frequency modulation and swept-frequency signal.
It is illustrated in figure 3 digital signal generator circuit, Direct Digital Frequency Synthesizers (dds) chip that this circuit adopts
Ad9852, is to be directly synthesized required waveform from phase quantization concept, using digitizing technique, by controlling frequency control word
Various different frequency signals required for directly producing.Dds chip ad9852 has been internally integrated reference clock, phase-accumulated in itself
Device, sine lookup table, d a transducer and wave filter etc..Can directly be produced by arranging the frequency control word of dds chip ad9852
The signals such as raw single frequency sinusoidal, frequency modulation, frequency sweep.System with low-power scm msp430f1612 as control core, to system signal
Modulation system is configured, and controls the sinusoidal simple signal of Direct Digital Frequency Synthesizers (dds) output, FM signal, frequency sweep letter
Number.
Realize the control to dds chip ad9852 by msp430f1612 single-chip microcomputer, produce 50hz～1khz frequency model
Sinusoidal signal in enclosing.The frequency conversion of ad9852, resolution, degree of stability, phase noise can much meet formation 50hz～
The requirement of signal in 1000hz low-frequency range, and have the characteristics that output signal is easy to digital modulation, work as single-chip microcomputer
When the inside crystal oscillator of msp430f1612 is supplied to its specific frequency clock source, produce frequency, phase place, amplitude programmable regulating
Sine wave, and adjust the frequency of sine wave it is possible to form FM signal and swept-frequency signal.
Power amplification circuit
Power amplification circuit includes the positive amplifying circuit being respectively constituted by two panels integrated power operational amplifier u2 and u3
With reverse amplification circuit, the normal phase input end of u2 and the inverting input of u3, respectively as two input ports of transmission signal,
The outfan out+ of positive amplifying circuit connects to the positive input terminal of magnetoelectricity flextensional transducer, the outfan of reverse amplification circuit
Out- connects to the negative input end of magnetoelectricity flextensional transducer.
It is illustrated in figure 4 power amplification circuit, the model that wherein integrated power amplifier u2, u3 selects is opa512, its
In, the physical circuit form that u2 takes is positive amplifier, also have in positive amplifier current-limiting resistance r59, r61, r63 and
R64, impedance matching resistor r62, amplification control resistance r58 and r60, audion q13 and q14, diode d4 and d5.
Current-limiting resistance r59, r61, r63, r64 play the effect of current-limiting protection, and impedance matching resistor r62 plays impedance matching
Effect, amplify control resistance r58, r60 control voltage amplification, audion q13, q14 are pnp and npn structure respectively
To pipe, the follower of composition, play the effect improving current driving ability.D4, d5 are heavy-duty diodes, play output voltage
The effect of protection.
Annexation in positive amplifier is that No. 4 pins of u2 are grounded by resistance r62, and No. 5 pins of u2 pass through electricity
Resistance r58 ground connection, No. 3 pins of u2 are connected to+24v supply voltage by resistance r59, and No. 2 pins of u2 are connected by resistance r61
To No. 1 pin of u2, audion q13 is pnp structure, and the base stage of q13 connects to No. 3 pins of u2, the colelctor electrode of q13 connect to
No. 1 pin of u2, the emitter stage of q13 connects to+24v supply voltage；No. 1 pin of u2 connects the positive pole of d4, and the negative pole of d4 is even
It is connected to+24v supply voltage, No. 1 pin of u2 passes through r60 and r58 and is grounded；No. 6 pins of u2 are connected to -24v electricity by r 64
Source voltage, No. 8 pins of u2 are connected by resistance r63 to No. 1 pin of u2, and audion q14 is npn structure, and the base stage of q14 is even
It is connected to No. 6 pins of u2, the colelctor electrode of q14 connects to No. 1 pin of u2, and the emitter stage of q14 connects to -24v supply voltage；By
No. 1 pin of u2 draws the outfan out+ of positive amplifier；The amplification of positive amplifier is k1=1+r60/r58.
The physical circuit form that u3 takes is sign-changing amplifier, also have in sign-changing amplifier current-limiting resistance r65, r67,
R70 and r71, impedance matching resistor r69, amplification control resistance r68 and r66, audion q15 and q16, diode d6 and d7.Respectively
The effect of the components and parts device effect corresponding with above-mentioned forward direction amplifier is similar.
Annexation in sign-changing amplifier is that No. 4 pins of u3 are grounded by resistance r69, and No. 5 pins of u3 pass through electricity
Resistance r68 ground connection, No. 3 pins of u3 are connected to+24v supply voltage by resistance r65, and No. 2 pins of u3 are connected by resistance r67
To No. 1 pin of u3, audion q15 is pnp structure, and the base stage of q15 connects to No. 3 pins of u3, the colelctor electrode of q15 connect to
No. 1 pin of u3, the emitter stage of q15 connects to+24v supply voltage；No. 1 pin of u3 connects the positive pole of d6, and the negative pole of d6 is even
It is connected to+24v supply voltage, No. 1 pin of u3 passes through r66 and r68 and is grounded；No. 6 pins of u3 are connected to -24v electricity by r 71
Source voltage, No. 8 pins of u2 are connected by resistance r70 to No. 1 pin of u3, and audion q16 is npn structure, and the base stage of q16 is even
It is connected to No. 6 pins of u3, the colelctor electrode of q16 connects to No. 1 pin of u3, and the emitter stage of q16 connects to -24v supply voltage；By
No. 1 pin of u3 draws the outfan out- of sign-changing amplifier；The amplification of sign-changing amplifier is k2=-r66/r68.
Positive amplifying circuit combines composition semibridge system power amplification circuit, Current amplifier ability and electricity with reverse amplification circuit
Pressure amplifying power doubles simultaneously, and that is, power amplification ability is 4 times of single-sided conductive paths.
Magnetoelectricity flextensional transducer
Magnetoelectricity flextensional transducer is used for converting electrical energy into mechanical energy, launches in the form of a sound wave.In the present embodiment
Magnetoelectricity flextensional transducer can be the magnetostrictive transducer or magneto-electric motorized transducer that rare earth material is made.
Set of cells:
It is signal generating circuit that set of cells is used for and power amplification circuit is powered, you can provide+24/-24v supply voltage.
The operation principle of small underwater frequency acoustic emitter:
The transmission of signal is with the process launched as seen from Figure 1: signal generating circuit can produce sine as needed
Simple signal, swept-frequency signal or FM signal and band limited noise signal.The small-sized work(that signal is constituted through integrated amplifier chip
After rate amplifying circuit amplifies, drive magnetoelectricity flextensional transducer, the signal of telecommunication is changed into acoustical signal and launches.During this,
Set of cells is powered with power amplification circuit for signal generator circuit.
The application of small underwater frequency acoustic emitter:
In underwater acoustic engineering research, whether underwater sound equipment exploitation or hydroacoustic physics measurement, low-frequency sound source is all under water
Common equipment.And on lake or marine field trial, be very different with the use environment condition in laboratory or anechoic tank,
The underwater sound source of miniaturization will bring convenience for laying salvaging；If in lake, extra large field trial, being especially by deep water test
When, using conventional all purpose instrument equipment, such as function signal generator, power amplifier, low-frequency transducer etc., just generally require to make
With Fuel generating apparatus, the vibration of generating equipment and radiated noise travel under water, may bring interference to test.Based on
Upper 2 points, powered using battery, magneto-electric flextensional transducer is driven by the signal generating circuit specially developed and power amplifier
Constitute miniature, low frequency acoustic transmitter, in the case that continuous working period is less demanding under water, disclosure satisfy that low frequency sinusoidal,
The underwater emission of frequency modulation, swept-frequency signal and band limited noise signal.
In sum, these are only presently preferred embodiments of the present invention, be not intended to limit protection scope of the present invention.
All any modification, equivalent substitution and improvement within the spirit and principles in the present invention, made etc., should be included in the present invention's
Within protection domain.
Claims (6)
1. a kind of small underwater frequency acoustic emitter is it is characterised in that include signal generating circuit, power amplification circuit, magnetic
Electric flextensional transducer and set of cells；
Described signal generating circuit includes band limited noise signal generator circuit and digital signal generator circuit two parts；
Described band limited noise signal generator circuit is produced when reaching Zener voltage, being operated in avalanche condition using Zener diode
Raw broadband AC noise signal, this broadband AC noise signal, after amplification and bandpass filtering, forms band limited noise signal；
It is by the frequency control word of Single-chip Controlling Direct Digital Frequency Synthesizers dds chip that described digital signal produces circuit,
Produce sinusoidal simple signal, FM signal and swept-frequency signal；
Described power amplification circuit includes two panels integrated power operational amplifier, respectively forward direction amplifier and sign-changing amplifier,
The normal phase input end of positive amplifier and the inverting input of sign-changing amplifier, respectively as two inputs of transmission signal
Mouthful, the outfan out+ of positive amplifier connects to the positive input terminal of magnetoelectricity flextensional transducer, the outfan of sign-changing amplifier
Out- connects to the negative input end of magnetoelectricity flextensional transducer；
It is signal generating circuit that described set of cells is used for and power amplification circuit is powered；
After this acoustic transmitter connects set of cells, signal generating circuit produces low sine, frequency modulation, swept-frequency signal or band limited noise letter
Number, signal, after the amplification of power amplification circuit, drives magnetoelectricity flextensional transducer, converts electrical energy into mechanical energy, with sound wave
Form launch.
2. as claimed in claim 1 a kind of small underwater frequency acoustic emitter it is characterised in that described band limited noise signal
Generator circuit specifically includes Zener diode circuit, positive amplifying circuit and multichannel negative feedback type band filter；
Described Zener diode circuit includes two Zener diodes, the respectively first Zener diode d1 and the second Zener two pole
Pipe d2, four resistance, respectively first resistor r1, second resistance r2,3rd resistor r3 and the 4th resistance r4, two audions,
It is respectively the first audion q1 and the second audion q2, four electric capacity, the respectively first electric capacity c1, the second electric capacity c2, the 3rd electricity
Hold c3 and the 4th electric capacity c4, and powered using 24v supply voltage；
The colelctor electrode of the wherein first audion q1 is connected to 24v supply voltage, the emitter stage of the first audion q1 by resistance r3
Be grounded by resistance r2, the base stage of q1 connects the positive pole of the first Zener diode d1, the negative pole one side of d1 pass through resistance r1 and
R3 connects to 24v supply voltage, is on the other hand grounded by electric capacity c1；
The colelctor electrode of the second audion q2 is connected to 24v supply voltage, the emitter stage of the second audion q2 by 3rd resistor r3
It is grounded by the second electric capacity c2, the base stage of the second audion q2 connects the positive pole of the second Zener diode d2, negative pole one side of d2
Face is connected to 24v supply voltage by the 4th resistance r4 and 3rd resistor r3, on the other hand passes through the 4th electric capacity c4 ground connection；
The emitter stage of the first audion q1 and the second audion q2 is joined directly together；
The positive pole of the 3rd electric capacity c3 is connected to 24v supply voltage by 3rd resistor r3, and the negative pole of the 3rd electric capacity c3 is as Zener
The outfan of diode circuit；
The outfan of Zener diode circuit connects to the positive input terminal of positive amplifying circuit；
Described forward direction amplifying circuit is made up of operational amplifier tlc2262 and its peripheral circuit
The outfan of described forward direction amplifying circuit connects the input of multichannel negative feedback type band filter.
3. as claimed in claim 1 or 2 a kind of small underwater frequency acoustic emitter it is characterised in that described digital signal
Produce in circuit, the Direct Digital Frequency Synthesizers dds chip being adopted is ad9852, the single-chip microcomputer being adopted is
Msp430f1612 single-chip microcomputer.
4. as claimed in claim 1 a kind of small underwater frequency acoustic emitter it is characterised in that positive amplifier is by model
Chip u2 for opa512 and its peripheral circuit are constituted, and sign-changing amplifier is by the chip u3 of model opa512 and its peripheral circuit
Constitute；
The peripheral circuit of chip u2 also includes the first current-limiting resistance r59, the second current-limiting resistance r61, the 3rd current-limiting resistance r63 and
Four current-limiting resistance r64, impedance matching resistor r62, first amplify control resistance r58 and second amplify control resistance r60, the three or three
Pole pipe q13 and the 4th audion q14, the first diode d4 and the second diode d5；
Chip u2 with the annexation of device each in peripheral circuit is: No. 4 pins of chip u2 are grounded by resistance r62, chip
No. 5 pins of u2 are grounded by resistance r58, and No. 3 pins of chip u2 are connected to+24v supply voltage, chip by resistance r59
No. 2 pins of u2 are connected by the second current-limiting resistance r61 to No. 1 pin of chip u2, and the 3rd audion q13 is pnp structure, the
The base stage of three audion q13 connects to No. 3 pins of chip u2, and the colelctor electrode of the 3rd audion q13 connects to No. 1 of chip u2
Pin, the emitter stage of the 3rd audion q13 connects to+24v supply voltage；No. 1 pin of chip u2 connects the first diode d4
Positive pole, the negative pole of the first diode d4 connects to+24v supply voltage, and No. 1 pin of chip u2 passes through second and amplify to control electricity
Resistance r60 and first amplifies and controls resistance r58 ground connection；No. 6 pins of chip u2 are connected to -24v electricity by the 4th current-limiting resistance r64
Source voltage, No. 8 pins of chip u2 are connected by the 3rd current-limiting resistance r63 to No. 1 pin of chip u2, the 4th audion q14
For npn structure, the base stage of the 4th audion q14 connects to No. 6 pins of chip u2, and the colelctor electrode of the 4th audion q14 connects
To No. 1 pin of chip u2, the emitter stage of the 4th audion q14 connects to -24v supply voltage；Drawn by No. 1 pin of chip u2
Go out the outfan out+ of positive amplifier；The amplification of the positive amplifier of chip u2 and its peripheral circuit composition is k1=1+
r60/r58；
The peripheral circuit of chip u3 also includes the 5th current-limiting resistance r65, the 6th current-limiting resistance r67, the 7th current-limiting resistance r70 and
Eight current-limiting resistance r71, impedance matching resistor r69, the 3rd amplify control resistance r68 and the 4th amplify control resistance r66, the five or three
Pole pipe q15 and the 6th audion q16, the 3rd diode d6 and the 4th diode d7；
Chip u3 with the annexation of device each in peripheral circuit is: No. 4 pins of chip u3 are connect by impedance matching resistor r69
Ground, No. 5 pins of chip u3 pass through the 3rd and amplify control resistance r68 ground connection, and No. 3 pins of chip u3 pass through the 5th current-limiting resistance
R65 connects to+24v supply voltage, and No. 2 pins of chip u3 are connected by the 6th current-limiting resistance r67 to No. 1 pipe of chip u3
Foot, the 6th audion q16 is pnp structure, and the base stage of the 6th audion q16 connects to No. 3 pins of chip u3, the 6th audion
The colelctor electrode of q16 connects to No. 1 pin of chip u3, and the emitter stage of the 6th audion q16 connects to+24v supply voltage；Chip
No. 1 pin of u3 connects the positive pole of the 3rd diode d6, and the negative pole of the 3rd diode d6 connects to+24v supply voltage, chip u3
No. 1 pin pass through the 4th amplify control resistance r66 and the 3rd amplify control resistance r68 ground connection；No. 6 pins of chip u3 pass through
8th current-limiting resistance r71 connects to -24v supply voltage, and No. 8 pins of chip u2 are connected to core by the 7th current-limiting resistance r70
No. 1 pin of piece u3, the 5th audion q15 is npn structure, and the base stage of the 5th audion q15 connects to No. 6 pipes of chip u3
Foot, the colelctor electrode of the 5th audion q15 connects to No. 1 pin of chip u3, and the emitter stage of the 5th audion q15 connects to -24v
Supply voltage；The outfan out- of sign-changing amplifier is drawn by No. 1 pin of chip u3；Chip u3 and its peripheral circuit composition
The amplification of sign-changing amplifier is k2=-r66/r68.
5. as claimed in claim 1 a kind of small underwater frequency acoustic emitter it is characterised in that described magnetoelectricity flextensional transducing
The material of the vibrating mass of device is to have the rare earth material of magnetostrictive effect characteristic.
6. as claimed in claim 1 a kind of small underwater frequency acoustic emitter it is characterised in that described set of cells be power
Intensive lithium ion battery or fuel cell.
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| CN201410564269.2A CN104539299B (en) | 2014-10-21 | 2014-10-21 | Small-sized underwater low-frequency acoustic transmitter |
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| CN201410564269.2A CN104539299B (en) | 2014-10-21 | 2014-10-21 | Small-sized underwater low-frequency acoustic transmitter |
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| CN104539299B true CN104539299B (en) | 2017-01-25 |
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| CN108809106A (en) * | 2018-06-29 | 2018-11-13 | 杜旭可 | A kind of the high direct voltage converter and its production technology of ultra-thin no electromagnetic interference |
| CN110492878B (en) * | 2019-08-08 | 2020-12-01 | 厦门大学 | Small underwater subwavelength acoustic switch device |
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| CN1779482A (en) * | 2004-11-26 | 2006-05-31 | 中国船舶重工集团公司第七一五研究所 | Transmitting method and transmitter for underwater super-wideband combined audio array |
| CN203480026U (en) * | 2013-09-02 | 2014-03-12 | 夏光辉 | Search-and-rescue sonar system |
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2014
- 2014-10-21 CN CN201410564269.2A patent/CN104539299B/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1779482A (en) * | 2004-11-26 | 2006-05-31 | 中国船舶重工集团公司第七一五研究所 | Transmitting method and transmitter for underwater super-wideband combined audio array |
| CN203480026U (en) * | 2013-09-02 | 2014-03-12 | 夏光辉 | Search-and-rescue sonar system |
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| 任意波形信号发生器的研究;王硕;《中国优秀硕士学位论文全文数据库》;20100615;全文 * |
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