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INVESTIGATION OF NON-LINEAR PARAMETRIC SOUND RECEPTION
V. Timoshenko, V. Voronin, V. Maksimov
To cite this version:
V. Timoshenko, V. Voronin, V. Maksimov. INVESTIGATION OF NON-LINEAR PARAMET- RIC SOUND RECEPTION. Journal de Physique Colloques, 1979, 40 (C8), pp.C8-98-C8-100.
�10.1051/jphyscol:1979818�. �jpa-00219523�
JOURNAL DE PHYSIQUE CoZZoque C8, suppZ6ment au nO1l, tome 4 0 , novembre 7979, page C 8 - 98
INVESTIGATION OF NON-LINEAR PARAMETRIC SOUND RECEPTION V . I . TIMOSHENKO
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V.A. VORONIN-
V.N. MAKSIMOVResum@.
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L ' a r t i c l e presente l e s r e s u l t a t s d'une recherche experimentale concernant un recepteur acoustique non l i n C a i r e parametrique dans l a bande de frequence 10a
20 kHz. On donne egalement l e schema,de p r i n c i p e d'un d i s p o s i t i f q u i a 6 t 6 developpe ; c e l u i - c i e s t l e complement un ensemble de d i s p o s i t i f s d16mission parametrique.Abstract.
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The paper presents the r e s u l t s o f an experimental research o f n o n l i n e a r parametric sound r e c e i v e r i n t h e frequency range o f 10-20000 c.p.s.The s t r u c t u r a l scheme o f a developed arrangement i s given as w e l l . The arrangement i s an a d d i t i o n a l p a r t t o a s e t o f arrangement o f parametric sound r a d i a t o r .
I n r e c e i v i n g - r a d i a t i n g non-1 i n e a r parametric t h e r e s u l t s o f t h e experimental i n v e s t i g a t i o n o f a c o u s t i c systems c r e a t i o n o f d i r e c t i o n a l r e c e p t i o n t h e n o n - l i n e a r parametric sound r e c e i v e r model.
u s i n g t h e n o n - l i n e a r parametric sound r e c e p t i o n The device created i s an a d d i t i o n t o t h e s e t o f makes c o n t r i b u t i o n , t o the advantages o f n o n - l i n e a r parametric a c o u s t i c a l r a d i a t o r s /6-8/.
r a d i a t o r /I/ (band width, small s i z e o f a transdu- In most pub1 i c a t i ons on parametric r e c e i v e r s the cer, a narrow d i r e c t i o n a l diagram i n a broad band, i n f o r m a t i o n about t h e r e c e i v e d low-frequency s i g n a l d e f i c i e n c y o f s i d e lobes). i s s i n g l e d o u t by means o f spectrum component pro-
The theory o f parametric sond r e c e i v e r s was cessing o f t h e sum and d i f f e r e n c e frequencies.
developed i n t h e works suggested by P.Y. Westerwelt The low-frequency a u d i b l e s i g n a l i n t h e crea- /I/, H.O. Berktay /2/, Y.Y. Truchard / 3 , 4 / , t e d device i s detected by t h e momentary v a r i a t i o n V.A. Zverev and A. I. Kalachev and others /5/. o f t h e pumping wave phase, s i n c e t h e s i g n a l s i n g l e d
The i n t e r a c t i o n o f pumping wave and a sound o u t by t h e r e c e i v i n g transformer and created as a wave i n t h e parametric sound r e c e i v e r s occurs i n r e s u l t o f low-frequency received s i g n a l i n t e r a c t i o n t h e medium under t h e i r mutual propagation. I n t e r a c - w i t h pumping wave may be represented as a phase- t i n g w i t h a powerful pumping wave, t h e sound wave modulated pumping wave by a low-frequency s i g n a l . r e c e i v e d modulates t h e former. F i g u r e 1 shows t h e b l o c k diagram o f the e l a - Recording and processing o f t h e modulated pumpi ng borated n o n - l i n e a r parametric sound r e c e i v e r . wave g i v e s possi b i 1 i ty t o d e f i n e t h e parameters o f
t h e low-frequency received s i g n a l . Separation o f t h e energy t r a n s f o r m e r from t h e t r a n s f o r m a t i o n space o f t h e s i g n a l spectrum gives a number o f t e c h n i c a l advantages o f parametric sound r e c e i v e r s a p p l i c a t i o n o v e r t h e t r a d i t i o n a l ones. U n l i k e t h e r a d i a t o r /6/
f r e q u e c i e s o f t h e i n t e r a c t i n g waves i n the parame- t r i c r e c e i v e r d i f f e r g r e a t l y . Besides, t h e wave
v e c t o r s o f the i n t e r a c t i n g waves may be n o n - c o l l i- Fig. 1.
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The b l o c k diagram o f t h e n o n - l i n e a r para-near. m e t r i c sound r e c e i v e r .
To c a l c u l a t e t h e c h a r a c t e r i s t i c s o f parametric r e c e i v e r s one can use the s o l u t i o n method o f hydro- dynamic n o n - l i n e a r equations. The paper presents
Article published online by EDP Sciences and available at
Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:1979818
JOURNAL DE
C8- 99
PHYSIQUE The non-linear parametric receiver contains the
radiating high-frequency pumping piezotransducer 4, having the resonance frequency 1,25 MC and the dia- meter 30 mm, and the same receiving piezoceramic transducer 5, which a r e placed on one axis a t some distance L between them and which have a r i g i d cou- pling. The distance L constitutes the base of the non-linear parametric receiver antenna.
The high-frequency o s c i l l a t o r 1 o s c i l l a t e s high-frequency o s c i l l a t i o n s which a r e supplied t o the radiating transformer 4 through a buffer ampli- f i e r 2 and a power amplifier 3. The o s c i l l a t o r has quartz frequency stabi l i s a t i o n , t h i s r e s u l t s i n re- ducing p a r a s i t i c phase fluctuations in the o s c i l l a t o r i t s e l f .
The pumping transformer 4 radiates the acous- t i c o s c i l l a t i o n s Vh with the frequency WH t o the medium, where they i n t e r a c t with the received 1 ow- frequency signals VC, having the frequency WC. As a r e s u l t , the piezoceramic transducer 5 receives a complex signal, which can be represented as a wave having the frequency WH phase-modulated by means of the low-frequency signal VC with the modulation f r e - quency WC. The recerved signals a r e amplified 6 and detected by a phase discriminator 7, t o which the standard voltage i s supplied from the power ampli- f i e r 3 througt the phase s h i f t e r 8. The amplifier 6 has the automatic control of transmission f a c t o r , which permits t o reduce the amp1 i tude fluctuations influence of the received signal. The signal, the value of which i s proportional t o the amplitude of the received signal and i t s frequency corresponding t o the frequency W C , i s singled out a t the output of the phase discriminator 7. From the matching stage the signal i s delivered t o the amplifier 11, opera- t i n g together w i t h the imput and output f i l t e r s 10.
Thus, Voutput i s singled out a t the output of the receiver. I t i s the voltage Voutput t h a t gives the complete information about the received low-fre- quency signal VC.
The experimental investigation of the elabora- ted non-1 i near parametric sound receiver was car- ried out on a hydrosacoustic basin having. the length 40 M. The base of the receiver was varied in the range 0.5
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2 M. The source of the low-frequency signal w i t h the range frequency of 10-20.000 C waslocated a t a distance of 11 M from the receiving pa- rametric antenna. The measurements were carried out in a pulse mode.
The experimental dynamic c h a r a c t e r i s t i c of the non-linear parametric sound receiver (curve 1) i s presented in figure 2.
Fig, 2.
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Dynamic c h a r a c t e r i s t i c s :-
1-of the parametric receiver :-
2-of the hydrophoneFor the sake of comparaison the dynamic characteris- t i c of a hydrophone (curve 2) which represents a piezoceramic sphere having a diameter 50 mm i s shown i n f i g . 2. The dynamic c h a r a c t e r i s t i c s are l i n e a r i n a broad range of received signals ampli- tudes.
Fig. 3.
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Directional diagrams : F = 6KC a t F = l O K C , a f u l l l i n e -theory /2,5/.Fig. 3. i l l u s t r a t e s the directional diagrams of the non-linear parametric receiver operating a t the frequency 2$ and l O K C with t h e length of t h e
V.I. TIMOSHENKO, and a l . base L = 1 M (the experimental values a t the f r e -
quency 2KC are shown by points, a t the frequency 6KC
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by dotted l i n e s , a t the frequency l O K C-
bymeans of crosses). Here t h e f u l l l i n e represents t h e directional diagram of the parametric receiver.
According t o the r e s u l t s of the works /2/ and /5/
the diagram was designed f o r the frequency of the received signal l O K C and the base of the receiver
L = 1M.
The s e n s i t i v i t y of the created receiver having the r a t i o of the signal t o the noise 30 dB was 100 MV/Pa, which corresponds t o the variation of the pumping wave phase
A T
= degree/Pa and can be improved by applying some more advanced diagrams (schemes) of the phase discriminator. The s e n s i t i v i t y of the receiver i s i n a good agreement w i t h t h e data presented in /5/.The frequency range of the signals beings received may be considerably enlarged both f o r low and high frequencies.
The experimental r e s u l t s of the amplitude and space d i r e c t i v i t y c h a r a c t e r i s t i c s of t h e parametric sound receiver given i n the report showed the possi bi 1 i t y of p r a t i c a l application of the created devices i n complex with t h e parametric acoustical radiator.
REFERENCES
/1/ Westerwel t, P.Y., Parametric acoustic array.
Y.A.S.A., 1963, p. 535-537.
/2/ Berklay, H.O., C.A. A l .
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Temini v i r t u a l a r r a - y f o r underwater reception.Y . Sound Vib. 1969, 9, 2.
/3/ Truchard, Y.Y., Parametric acoustic receiving array. I Theory, Y .A.S.A., 1975,
58,
6 , p. 1141-1145./4/ Truchard, Y.Y., Parametric acoustic receiving array. I1 Experiment, Y.A.S.A., 1975,
58,
6, p. 1146-1150./5/ Zverev, V.A., Kalachev, A.I., "Directional Parametric Acoustical receiver". "Collection of reports delivered a t the VII All-Union acoustic Conference i n physical and technical acousti s".
L. 1971.
/6/ Novikov, B.K., Rybachek, M.S., Timoshenko,V.I.,
"Diffracting Sound Beams Interaction and the Theory of Highly Directed Ultresound Radiators".
Acoustic Magasine of the USSR Academy of Scien- ces, v. XXIII, n.4, 1977, p.p. 621-626.
/7/ Timoshenko, V.I., Novikov, B.K., Rybachek, M.S.,
"Pacl i a t i o n Field Distribution' i n Acoustic Waves Interaction". VI International Symposium on Non-1 inear Acoustics, Moscow, 1975,
p. 238-241.
/8/ Voronin, V.A., Rybachek, M.S., Tarasov, S.P., Timoshenko, V. I . ,
"Investigations and New ;eve1 opments of parame- t r i c Measuring Radiators
.
Collection of reports delivered a t t h e IX A1 1 -Union Acoustic Conference, Section 8 , Moscow, 1977, p.p. 67-70.
