空気の屈折率変調を光学的に検出する超指向性マイクロホン
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1 23 2 1M36268
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4 1-1 ( 1) ( 2) 1-1 a ( sinθ ) 2J D ( θ ) = 1 (1-1) kaka sinθ ( 3) 1-2 1
5 Back face hole Amplifier Diaphragm Equiphase wave surface Acoustic tube 1-2 ( 3 ) 1 1 khz 27 cm (1-1) 1-3 ( 3) Toepler ( 4) Schardin 2
6 W L C F 1 S K O F O 1 P T L C S K T O F O P T Mc cm/s mm 1 O F W P P 1-5 F 1 (a) (b) 1-5 (a), (b) 3
7 ( 5) PVDF He-Ne Laser Mirror Transducer Water Tank Iris Photodiode He-Ne Laser Mirror Transducer Water Tank Iris Photodiode 1-6 4
8 5 (a) (b) (d) (c) 1-7 (a), (b) (c), (d) ( 6) 1
9 1 6 6
10 Laser Doppler Vibrometer: LDV 2-1 n l 2-1 LDV p l n n l LDV n l = n l (2-1) l l LDV Rigid Wall Sound Field 2-1 LDV 7
11 LDV v [m/s] f n ( 6) LDV n n = ν LDV (2-2) 2πfl Eykman ( 7) V /V n (2-3) V V n = n 1 1 n 633nm 15 1 ( 8) (2-3) 1, c P γ, ρ, p P (2-3) V 2 = γ, P γ = c ρ (2-4) V ( 3) p p 2 n c ρ ν n 1 2πfl = (2-5) LDV LDV p[pa] = ν LDV [mm / s] f [khz] l[mm] (2-6) LDV l LDV (6) khz 2-3 LDV LDV LDV 2-4 ( J (kr)) 8
12 LDV 2-5 LDV Langevin Transducer 4 mm in dia khz Conical Horn for Amplification Vibrating Ring (Aluminum) 61.3 mm in outer dia mm in inner dia. 3. mm in depth 2-2 Vibrating Ring Rigid Body 25mm 25mm LDV PI Polytech CLV Output of LDV (arb.) J (kr ) Position from the Center (mm) 2-4 LDV 9
13 PI Polytech PSV3 2-6 LDV 2 2 CCD Output of LDV (mm/s)pp Resolution of LDV Vibration Velocity of the Ring (mm/s)pp 2-5 LDV 2-6 1
14 khz 2-3 LDV 28.2 khz 12 mm LDV 2-8 7mm 7mm 7 Field Measured by the Present Method End Surface of a Langevin Transducer Laser Beam
15 2-1 LDV LDV LDV LDV LDV Return Mirror Laser beam Vertical Direction Steering mirror LDV Horizontal Direction
16 LDV 2-1 d n ϕ nπd sin sinϕ λ D ( ϕ) = (2-7) πd n sin sinϕ λ ( 5) n (d = 1/2 ) n 2-11 n =1 14 n =14 1 (2-7) 14 1 Sound wave Vertical Direction n d ϕ Laser beam
17 Normalized Sensitivity n =1 n = [deg.] ϕ l θ ( 5) πl sin sinθ λ D( θ ) = (2-8) πl sinθ λ Sound wave θ Laser beam l Horizontal Direction
18 2-13 (2-8) 1 l 7 λ l/ =5 1 2 Normalized Sensitivity [deg.] 2-13 (2-7) (2-8) (2-7) (2-8) 2-14 a x x ( 2a) 2 x λ (2-9) S (2-9) S x (2-1) λ (9) 15
19 a Piston x t - L d l n Mirror Laser beam LDV Vertical Direction Horizontal Direction
20 y p z k A A ( z y) ( t 2 p) n 1 2k 2n 1 2k, = l, d (2-11) 2n 4n y p z k B B ( t 2 2 p) n 1 2k 2n k ( z, y) = l, d (2-12) 2n 4n A- R B- R a ( 2p) 2 2 n 1 2k 2n t 1 2k = + + d R a L z l y (2-13) 2n 4n ( 2 2p) n 1 2k 2nt k = L + z l y d R b + (2-14) 2n 4n p p = n 1 t 1 1 2π cos Ra Ra λ π k= p= j sin Ra + sin Ra λ Rb + b 1 2π cos Rb Rb λ π R b λ 2 (2-15) (2-15) t = 12 L = 12 m d =.1 m l = 1.53 m n = 2 2 khz (2-15)
21 LDV t d (z, y) = (, ) l t ( z, y) = (, d) 2 2 y d z l Mirror LDV n sections l l ( z, y) = ( k 2 2n l n t d, d 2 4n kd ) 2n 2-16 Normalized Sensitivity [deg]
22 1 7 λ 1/2 14 LDV 19
23 LDV 3-1 LDV LDV LDV PI-Polytec NLV-1232( : CLV-7) LDV He-Ne 5 mm/s/v 1 mm/s.5 µm/s 2 khz 3-1 2
24 ( 19mm 28.2kHz) 28.2 khz 12 mm (ϕ ) (θ ) d LDV LDV LDV LDV L x, y, z z x L=34mm x y ( ) ϕ 18 [deg] 1 3mm(25 λ ) d x y 3-2 (a) d =1/2 λ (b) d =1 λ 1/2 λ ϕ = 9 ϕ = 18 1 λ 3-2 (2-7) 1/2λ d = 1/ 2λ z x ( ) 16.7 θ [deg].6 1 m(83 λ) L = 5λ, 1λ 3-3 (2-8) L = 1λ 7 L = 5λ 14 21
25 zed LDV Output Normali ϕ [deg.] (a) Normalized LDV Output ϕ [deg.] (b) (a)d = 1/2 3-2 λ (b) d = 1 λ 22
26 Normalized LDV Output L = L = [deg.] LDV LDV LDV LDV
27 LDV Mirror Depth Direction Focus Point Pararell Direction 3-4 θ mm(16 λ) 3-5 x-z θ = mm(43 λ) x z LDV NLV-1232 ( 61 mm 53 mm 3 mm) ( 27.2 khz) LDV θ θ x-z LDV θ = x 1 [mm] 22 z 5 [mm] 2mm 24
![3-6 θ = 4 ( x, z) = (,265) [mm] θ = 3-6 z 5 z [mm] 1 θ = 2 4 3-7 3-7 θ = 2 θ = 2 4 θ = 2](/docs-images/91/106048367/images/28-0.jpg "θ = 4 θ = 2 θ = θ = 2 Mirror 2 mm LDV 541.")
28 3-6 θ = 4 ( x, z) = (,265) [mm] θ = 3-6 z 5 z [mm] 1 θ = θ = 2 θ = 2 4 θ = 2 θ = 4 θ = 2 θ = θ = 2 Mirror 2 mm LDV mm z Focus point x Langevin Transducer
29 z [mm] z [mm] z [mm] x [mm] x [mm] x [mm] (a) (b) (c) 3-6 (a) θ = (b) θ = 2 (c) θ = 4 26
30 Normalized LDV Output = =2 = z[mm] 3-7 z LDV mm(24 λ) θ = mm(35 λ) θ = x 1 [mm] 1 z 3 [mm] 2mm 3-9 θ = 4 (x.z)=(,25) [mm] 3 27
31 Mirror θ = 2 3mm LDV 439mm z Focus point x Langevin Transducer 3-8 z[mm] z[mm] z[mm] x[mm] x[mm] x[mm] (a) (b) (c) 3-9 (a) θ = (b) θ = 2 (c) θ = 4 28
32 29
33 3-1 1 (2-7) (2-8) 4-1 LDV 28.2 khz 12 mm 15mm 122mm (12.5 λ 1 λ ) 12 1 d d/ mm(1 λ ) 1/2 λ (2-1) 1.5 m 1 m(83 λ) LDV NLV-1232 θ ϕ θ ϕ 3
34 LDV 1 λ Mirror 12.5 λ (15 mm) 1 λ (122 mm) ϕ θ Langevin Transducer (28.2kHz 19mm) 4-1 d Approximation d/
35 6.8 ϕ 6.8 λ 16.7 θ [deg] [deg] ϕ = θ = (2-15) l =288mm LDV PI Polytech NLV µm / s (2-6) 28dB LDV Output[arb.] ϕ [deg.] 1 θ [deg.]
36 Normalized LDV Output [deg.] 4-4 Normalized LDV Output ϕ [deg.] -5 33
37 28.2 khz 2 khz( 17 mm) (2-7) (2-8) 4-1 Mirror Laser beam LDV 1 mm (.6λ) 123mm (7.2λ) 153mm (9λ) Reflector
38 θ = θ 33mm (19.4λ) LDV Head Microphone Speaker L 1456mm (85.6λ) 32mm (18.8λ) m(9 λ) 1.23m(7.2 λ) 1 mm(.6 λ) mm(9 λ) 24.3 λ (2 7) (2 8) 1 LDV PI-Polytec CLV-1 : CLV-M2 : CLV-M6 : CLV-7 NLV mm/s/v 2 mm/s.2 µm/s 25 khz 4-6 l =3672 mm LDV.2 µ m / s (2-6) 21dB 35
39 4-7 5 Hz 5 khz FFT ( CF-522) θ θ = (a) (b) 4-8 (a) (b) 36
40 (2-1) 11 m (2-15) L 4-8 [m] L 4 θ = 1 2kHz 1 5 ms L [mm] 34 mm/ms 1 1 t 1 = L + 5 [ms] (4-1) t 2 ( 1456 L) = [ms] (4-2) 34 t1 t 2 (4-1) (4-3) t 1 t 2 (4-3) L 1371 [mm]=13.71[m] (4-4) (4-4) L 11[m] L = 12[m] 4-9 L = 12[m] L = 4[m] 1 T 1 t [ms] T + t 5 1 t + T + t 5 [ms] (4-5) (4-1) (4-2) (4-5) L = 12[m] 37
41 T 2.6 [ms] (4-6) L = 4[m] T [ms] (4-7) (4-6) (4-7) L = 12[m] T 5ms L = 4 [m] T 2ms DS8812 L = m (a) (a) (b) (a) (a) T = 5 ms (b) 5 ms 1 35ms LDV 4-9 t 5 1 =35.29[ms] 4-9 L = 12 m 5 ms θ 9 [deg] ϕ 5. 2 [deg].5 (2-15) L = 4 m 2 ms θ 1 [deg] ϕ [deg]
42 11 LDV Output 35ms Trigger signal (a) 1ms 5ms Trigger 1ms/div 1ms/div (b) LDV (a) 1 ms/div (b) (a) 1 ms/div 39
43 Normalized LDV Output [deg] 1 (a) Normalized LDV Output ϕ [deg] (b) -1 (a) (b) 4
44 Normalized LDV Output Normalized LDV Output [deg.] (a) [deg.] ϕ (b) -11 (a) (b) 41
45 28,2 khz 7 8 (2 khz)
46 4-6 2 khz L 12 m θ FFT CF khz
47 CF Hz 2 khz 1 5 ms (2-6) l = = 3672 [mm] SPL[dB] Frequency[kHz] SPL[dB] Frequency[kHz] khz 44
48 LDV 5 Hz 5 khz f 2. 1[kHz] 17.7 db khz 2kHz LDV 5-4 LDV LDV LDV 4-6 CLV-1 LDV head 2 cm Mirror 5-4 LDV LDV FFT cm (2-6) l = 3672 [mm] LDV 5-4 LDV LDV 1. 9 f 2. 1[kHz] db 33.4 db 45
49 2 SPL[dB] Frequency[kHz] 5-5 LDV SPL[dB] 6 4 Optical Microphone LDV Frequency[kHz] 5-6 LDV 46
50 FFT 5-8 LDV Mirror 2 mm 2 mm LDV Head Mirror
51 [ 1-5 ] LDV Output[arb.] Once Reflection Twice Reflection Frequency[kHz] 5-8 FFT 5-9 LDV 5 Hz 5 khz O- O- 5-1 O- O- 48
52 SPL[dB] 6 Without Insulator With Insulator Frequency[kHz] 5-9 SPL[dB] Frequency[kHz] Without Insulator With Air-in Caster With Air-in Caster and O-ring 5-1 O- 49
53 15 mm FFT Without Vibration With Vibration SPL[dB] Frequency[kHz] khz 2kHz khz 5
54 LDV Head Optical Microphone Speaker 77 mm 5-12 SPL[dB] 1 5 Without Sound With Small Sound With Loud Sound Frequency[kHz]
55 LDV Head Optical Microphone Fan Heater 5 mm 5-14 SPL[dB] Without Fan Heater With Fan Heater Frequency[kHz]
56 5-4 LDV Hz 5 khz UC db UN-4 8 db f 2.1[kHz] 17.7 db 2.2 db db LDV -15.7dB 15.5 db SPL[dB] Optical Microphone(without insulator) Condenser Microphone Optical Microphone(with air-in caster) LDV LDV Frequency[kHz] Optical Microphone(without insulator) Optical Microphone(with air-in caster) Condenser Microphone 5-16 LDV 53
57 UC m (Earth Wind & Fire, Boogie Wonderland) 3 m θ 23.2 θ [deg] 2 Hz 5 khz 2dB MD (SONY MZ-R5) MD ( DS8812) Speaker L LDV Head θ Move Direction Condenser Microphone Optical Microphone 6.56 m 7 m 1 m
58 s 9 s MD Output[arb.] Output[arb.] Time[s] Condenser Microphone Time[s] Optical Microphone
59 m 2.15 m MD Speaker A LDV Head m Condenser Microphone Optical Microphone 2.15 m Speaker B 6.56 m 6 m 2 m
60 5-2 Monkey 6 m 35 4 km/h MD Running Direction Monkey (Honda) Condenser Microphone Optical Microphone 5-2 MD s
61 Output[arb.] Output[arb.] Time[s] Condenser Microphone Time[s] 8 1 Optical Microphone db 58
62 khz 15mm 122mm (12.5 λ 1 λ ) khz mm 1.23m ; 9 λ 7. 2λ khz 17.7 db 33.4 db 59
63 15 db 1 1. S/N 5 15 db 18 db CT 2 X 3 6
64 2 61
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19 Estimation of Sound Source Zone using The Arrival Time Interval 1080351 2008 3 7 S/N 2 2 2 i Abstract Estimation of Sound Source Zone using The Arrival Time Interval Koichiro Kanai The microphone array
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NAOSITE: Nagasaki University's Ac Title Author(s) 3D 計測によるコンクリート打継部及び曲面板の振動解析に関する研究 松田, 浩 ; 和田, 眞禎 ; 小嶋, 悟 ; 崎山, 毅 ; 森田, 千尋掲維 ; 仲村, 政彦 ; 山本, 晃 ; 鶴田, 健 Citation 応用力学論文集 Vol.3, pp.5-4, Issue Date URL http://hdl.handle.net/69/648
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mt_4.dvi
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QMI_10.dvi
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