SG11201902957RA - Optical remote sensing of vibrations - Google Patents

Abstract

97 100 134 95 Phase shifter 97A RF shifter(s) 91 Vibrating source Processing unit Aperture 150 130D fc 92 Carrier frequency 131 Vibration intensity y -133 Frequency 96 Interference pattern 122 25 . Amplitude 1 ► 99 / 0 Optical unit Figure 2A Vibration frequency 131A 122 Mask (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (43) International Publication Date 12 April 2018 (12.04.2018) WIP0 1 PCT omit VIII °nolo olliolu (10) International Publication Number WO 2018/065982 Al (51) International Patent Classification: G01H 9/00 (2006.01) GO1B 9/02 (2006.01) (21) International Application Number: PCT/IL2017/051116 (22) International Filing Date: 02 October 2017 (02.10.2017) (25) Filing Language: English (26) Publication Language: English (30) Priority Data: 248274 09 October 2016 (09.10.2016) IL (71) Applicants: ELBIT SYSTEMS LAND AND C4I LTD. [IL/IL]; 5 Hagavish Street, 4250705 Netanya (IL). SOREQ NUCLEAR RESEARCH CENTER [IL/IL]; Yavne 81800, 81800 Yavne (IL). (72) Inventors: NUSSINSON, Dan; 5 Hagavish Street, 4250705 Netanya (IL). LEV, Aner; 5 Hagavish Street, 4250705 Netanya (IL). KARL, David; 5 Hagavish Street, 4250705 Netanya (IL). (74) Agent: WEILER, Assaf; Pearl Cohen Zedek Latzer Baratz, P.O. Box 7198, Tel Aviv 6107121 (IL). (81) Designated States (unless otherwise indicated, for every kind of national protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (84) Designated States (unless otherwise indicated, for every kind of regional protection available): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, (54) Title: OPTICAL REMOTE SENSING OF VIBRATIONS (57) : Systems and methods are provided, which use at least two coherent light sources with known phase relations between them, which are configured to illuminate a target with at least two corresponding spots, an optical unit comprising a mask and configured to focus, onto a sensor, interfered scattered illumination from the spots of the target, passing through the mask, to yield a signal, at least one shifter configured to shift a frequency of at least one of the coherent light sources to provide a carrier frequency in the signal, and a processing unit configured to derive a vibration frequency of the target from the sensor signal with respect to the carrier frequency. The vibration frequency of the target is separated from the carrier frequency and speckle disturbances may be attenuated or avoided. [Continued on next page] WO 2018/065982 Al MIDEDIMOMOIDEIRDERIONMEMIIIIIHIIIIIIIIIIIIIII11111111 TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG). Published: — with international search report (Art. 21(3))