GB2242270A - Acoustic microscope with concave transducer - Google Patents
Acoustic microscope with concave transducer Download PDFInfo
- Publication number
- GB2242270A GB2242270A GB9104911A GB9104911A GB2242270A GB 2242270 A GB2242270 A GB 2242270A GB 9104911 A GB9104911 A GB 9104911A GB 9104911 A GB9104911 A GB 9104911A GB 2242270 A GB2242270 A GB 2242270A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acoustic
- transduser
- piezoelectrics
- acoustic lens
- concave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/18—Methods or devices for transmitting, conducting or directing sound
- G10K11/26—Sound-focusing or directing, e.g. scanning
- G10K11/30—Sound-focusing or directing, e.g. scanning using refraction, e.g. acoustic lenses
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0609—Display arrangements, e.g. colour displays
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/89—Sonar systems specially adapted for specific applications for mapping or imaging
- G01S15/8906—Short-range imaging systems; Acoustic microscope systems using pulse-echo techniques
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/044—Internal reflections (echoes), e.g. on walls or defects
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Computer Networks & Wireless Communication (AREA)
- Multimedia (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
A reflection type of acoustic microscope comprises a signal generating and detecting device, a mechanical device for performing scanning movement, an acoustic lens having a concave piezoelectric transducer 30 for performing bath generation and focus of acoustic wave, and a general micro-computer for signal control, scanning movement control and image display. The acoustic lens further comprises a rod 32 of Molybdenum in a glass cylinder 31, an abrasion proof protective film 35 deposited on the surface of the transducer for obtaining long length of life, and a sleeve 36 having a plurality of claws 38 for avoiding damage. The acoustic microscope of the invention has advantages over that of prior art in the respects of sensitivity, resolution, cost, and expansibility. <IMAGE>
Description
Reflection Sye of Acoustic Microscope with Acoustic
Lens having Concave Transduser
The present invention relates to an acoustic microscope
technical field, and more particularly, to a reflection
type of acoustic microscope with acoustic lens having
concave transduser.
Acoustic microscope is a new type of microscope
developed in recent years, which differs from optical
microscope by refraction and reflection of acoustic
wave rather than that of light wave being used to
monitor samples. As acoustic wave possesses stronger
permeability than light wave, acoustic microscope can
be used to detect interior structure of opaque saple
undamagedly, with this characteristic, this kind of
microscope has a wild use field in undamaged precision
detection, such as material, microelectronics,
optronics, etc.One of the most advanced acoustic
microscope is ELSAM acoustic microscope developed by
Leitz Corporation, Germany, which consists of four
parts: pulse generating and acoustic signal detecting circuit, flat transduser type of acoustic lens,
mechanical device, and control and display device, as
shown in Fig. 1, in which the pulse generating and acoustic signal detecting circuit includes microwave source 11, modulator 12, microwave switch 13, matching network 14, microwave amplifier 15, detector 16, pulse amplifier 17, sampling and holding circuit 18, and video amplifier 19; the mechanical device includes five dimension working plate 112, scanning driver 113, driving power 114, position sensor 115 and scanning driver 116; the control and display device includes three special micro-computers 117 (uP8748), 118 (uP8085), 119 (uP8085), long-persistence scope 120, short-persistence scope 121, frame memory 122, TV monitor 123, direct memory access (DMA) 124, display and record switching circuit 110, and movement control circuit 111.
As shown in Fig. 2 the lens constructure of this kind comprises an einzel lens 21 of sapphire in the form of cylinder with a flat end and concave spherical end, and a flat transduser 20 consisting of electrodes (gold film) 201, 202:and piezoelectrics (zinc oxide) 203.
The flat transduser 20 attached to the flat end of the sapphire einzel lens 21 converts electric signal into plate acoustic wave that is then focused on sample by the einzel lens.
The disadvantage of this kind of acoustic microscope lies in that incident acoustic wave obtained from the concave sphere is usually not an ideal plate wave, additionally a portion of incident plate acoustic wave would be conducted to outside of the concave sphere, though most of which conducted to the concave sphere, which reduces sensitivity of the acoustic lens, further more, this on the outside of the concave sphere would pass on sample by refraction, raising a cluter interference and reduction of image quality; and that cost of this one is too expensive as the sapphire material is used.
The disadvantage of this microscope also lies in that the mechanical device has small scanning range, generally not less than 1 mm, and five dimension working plate 112 needs to be adjusted manually if detected position is to be changed, so that multi-position detection can not be accomplished automatically; and that since the control and display device comprises three special micro-computers to perform the functions of mechanical scanning control, signal control and display respectively, it lends to complicated structure, difficulty to expand, e.g. it is difficult to transform ready-made software to the microscope, and expensive. cost.
It is an object of the present invention, therefore, to provide a new acoustic microscope which avoids one or more of the disadvantages of such prior acoustic microscope.
It is another object of the invention to provide a new acoustic microscope having a general micro-computer for performing mechanical scanning control, signal control and display.
It is another object of the invention to provide a new acoustic microscope having a new type of acoustic lens possessing properties of high sensitivity and high resolution.
It is another object of the invention to provide a new acoustic microscope having a new type of acoustic lens with protective components for preventing it to be damaged.
It is another object of the invention to provide a new acoustic microscope having a new driving circuit of stepping motor for obtaining high efficiency.
In accordance with the invention, a reflection type of acoustic microscope comprises means for generating pulse signal and detecting acoustic signal, acoustic lens, means for performing scanning movement, and general micro-computer. The acoustic lens has a concave transduser of piezoelectrics for generating and focusing acoustic wave, and the micro-computer consists of means for controlling the means of signal generation and detection, means for controlling the means of performing scanning movement, and means for displaying, memorising and processing image.
Also, in accordance with the invention, the acoustic lens further comprises a metallic pole for supporting the piezoelectrics, a conducting film attached to the piezoelectrics, the metallic pole and conducting film being used as electrodes of the transduser, a sleeve having a plurality of claws extended out of the transduser slightly to prevent it from to be damaged, and a protective film deposited on the conducting film.
Also, in accordance with the invention, the material of the piezoelectrics is any one of zinc oxide, lithium niobate and quartz.
Also, in accordance with the invention, the acoustic microscope further comprises a driving circuit for driving a stopping motor in the means of performing scanning movement, the driving circuit being in an operating state of cut-off and anplification and consisting of an amplifier and two RC parallel circuits, one of which being connected in series to input circuit of the amplifier and the other being connected in parallel to output circuit of the amplifier for improving pulse front edge and back edge of output of the driving circuit respectively.
Also, in accordance with the invention, the protective film of silicon nitride or adamap is deposited on the conducting film by microwave plasma chemical vapour deposition.
For a better understanding of the present invention together with other and further objects thereof, a preferred embodiment is, taken in connection with the accompanying drawings, described as follows.
Referring now to the drawings:
Fig. 1 is a schematic diagram representing an
acoustic microscope having a flat transduser type
of acoustic lens of the prior art;
Fig. 2 is a schematic diagram representing the
structure of the flat transduser type of acoustic
lens of the prior art;
Fig. 3 is a sectional view of a concave transduser
type of acoustic lens having protective sleeve and
abrasion proof protective film of the invention;
Fig. 4 is a sectional view of a front portion of
the concave transduser type of acoustic lens of
the invention;
Fig. 5 is a schematic diagram representing a
micro-computer of the acoustic microscope of the
invention;
Fig. 6 is an electric circuit diagram representing
a driving circuit for stepping motor of the
acoustic microscope of the invention;
Fig. 7 is a schematic diagram representing the
acoustic microscope of the invention.
Referring now more particularly Fig. 3 and Fig. 4, that represent sectional view of the concave transduser type of acoustic lens 3 having protective sleeve and abrasion proof protective film, and sectional view of the front end of the acoustic lens respectively. The acoustic lens comprises a concave transduser 30 of piezoelectric layer 33, a molybdenum pole 32, a gold film 34, a glass medium 31, a sleeve 36, an abrasion proof protective film 35 and a coaxial connector 37, in which, the material of the piezoelectric layer can be any one of zinc oxide, quartz, etc; the molybdenum pole 32 and gold film 34 are taken as electrodes of the layer and the former is also used to support the piezoelectric layer 33; the abrasion proof protective film 35 is a layer of silicon nitride or adamas deposited on the gold film 34 by microwave plasma chemical vapour deposition (MPCVD); the front edge of the sleeve 36 has a plurality of claws 38 extending slightly out of the transduser 30 to prevent it to be collided by sample or other bodies; and the transduser 30 is in the form of a concave, and preferred in form of concave sphere, therefore it takes a part of both generation and focus of acoustic wave.
It can be seen-obviously that as spherical wave which can be focused is only produced, but not any cluter, as long as diameter of metallic pole 32 is less than aperture of the concave sphere, ideal resolution can be achieved easily. The acoustic wave generated by the transduser 30 passes on sample directly, as compared with the acoustic lens of the prior art, no transmission loss and reflection loss exists, therefore, it raises the signal-to-noise ratio; and no sapphire material needs any more which mostly reduces cost of the acoustic lens.
Referring now more particularly to Pig. 5, it schematically represents a block diagram of micro-computer 5 in the embodiment of the present invention. The micro-computer 5 comprises a main frame 51, an A/D converter 52 and data acquisition module 52', a series-parallel converter 53 and control module 53', a graphic adapter 54 and graphic display module 54', a graphic adapter 55 and image process and display module 55', a high resolution colour display 56 and a high resolution multi-grey scale colour display 57, in which, the acquisition module 52', combined with the
A/D converter 52, performs conversion and acquisition of analogue signals that includes video amplifier output signal reflecting sample acoustic information and mechanical scan sensing signal; the control module 53', combined with the series-parallel converter 53, provides driving circuit of the stepping motor with driving signal that is a pulse series for controlling grating scan and positioning of working plate to realise multi-position detection automatically, additionally, provides the pulse generating and acoustic signal detecting circuit with control signal for selecting operating states of which such as operation frequency, microwave power level, etc.t the graphic display module 54', combined with graphic adapter 54, displays initial detection result, e.g.
graph or curve on the colour display 56; the image process and display module 55' processes the detection result, and combined with graphic adapter 55, displays high quality image obtained from the further image process on colour display 57.
Since the multi-micro computer structure of the prior art is replaced by the general microcomputer, it makes the acoustic microscope of the invention to be maintained and expanded easily. Additionally, the detecting result can be transferred to any other computer being compatible with that of the microscope of the invention to make further analysis.
Referring now more particularly to Fig. 5, it represents a driving circuit 6 of the stepping motor in the embodiment of the present invention. The driving circuit comprises a voltage amplifier including mainly transistor BG1, load resistor W1, R3 and parallel speed-up network R1, C1, and a power amplifier including mainly transistor BG2, load LA (winding of the stepping motor), resistor R5, discharging circuit
D1, R2, C2 and indicating circuit R4, LED, here, speed-up network R1, C1 and R2, C2 for improving pulse front edge and back edge of output of the driving circuit respectively, indicating circuit R4, LED for indicating operation of the stepping motor, the resistor R5 connected to collector of the transistor
BG2 in series for monitoring current of which, the input signal QA in form of pulse series that comes from the series-parallel converter 53.The power amplifier of the driving circuit is in the operating state of cut-off and amplification rather than cut-off and saturation state usually used in the prior art.
Depending on the effect of dynamic resistance raised by transient from cut-off state into amplification state of the transistor, a large power dissipation resistor appearing on collector branch of transistor BG2 in the prior art is to be deleted, which brings both high
efficiency and high driving speed.
Now referring more particularly to Fig. 7, which is a
block diagram of the acoustic microscope of the
embodiment of the present invention. It comprises four
parts of pulse generating and acoustic detecting
circuit, acoustic lens, mechanical device and control
and display device.
The pulse generating and acoustic detecting circuit
consisting of primary pulse source 71, pulse distributor 72, high frequency oscillator (100-150 MHZ)
73, microwave amplifier 74, modulator (HP33144A) 75,
circulator 76, matching network 77, microwave amplifier
78, detector 79, pulse amplifier 710, sampling and holding circuit 711, sampling pulse source 712, video
amplifier 713, filter 714, in which the primary pulse
source generates a short series of pulse controlling modulator 75, by which a modulated microwave signal is
produced. A pulse oscilloscope 715 can also be used
for measuring and determining the distance between testing face and surface of sample to be detected.
The acoustic lens is the concave transduser type of
lens having protective sleeve and abrasion proof
protective film.
The mechanical device comprises three dimension working plate 719, X,Y two dimension shift and scan plate 720,
scanning driver and position sensor 721. The scanning driver further comprises the stopping motor and driving
circuit 6.
The control and display device comprises micro-computer (IBM-PC) 51, A/D converter (MS-1215) 52, graphic adapter (EGA Board) 54, high resolution colour display (TVM) 56, graphic adapter (HYIPB1) 55, high resolution multi-grey scale display (OPC-OVM9E) 57, and series-parallel converter (FAT-0030)53.
Claims (11)
1. A reflection type of acoustic microscope, comprising means for generating pulse signal and detecting acoustic signal; acoustic lens; means for performing scanning movement; and general micro-computer, wherein said acoustic lens has a concave transduser of piezoelectrics for generating and focusing acoustic wave; and said micro-computer consists of means for controlling said means of signal generation and detection; means for controlling said means of performing scanning movement; and means for displaying, memorising and processing image.
2. An acoustic microscope according to Claim 1, wherein said acoustic lens further comprises a metallic pole for supporting said piezoelectrics; a conducting film attached to said piezoelectrics, said metallic pole and conducting film being uses as electrodes of said transduser; a sleeve having a plurality of claws extended out of said transduser slightly to prevent it from to be damaged; and a protective film deposited on said conducting film.
3. An acoustic microscope according to Claim 2, wherein material of said piezoelectrics is any one of zinc oxide, lithium niobate and quartz.
4. An acoustic microscope according to Claim -3, further comprising a driving circuit for driving a stepping motor in said means of performing scanning movement, said driving circuit being in an operating state of cut-off and amplification and consisting of an amplifier and two RC parallel circuits, one of which being connected in series to input circuit of said amplifier and the other being connected in parallel to output circuit of said amplifier for improving pulse front edge and back edge of output of said driving circuit respectively.
5. An acoustic microscope according to Claim 3 or 4, wherein said protective film of silicon nitride or adamas is deposited on the conducting film by microwave plasma chemical vapour deposition.
6. A concave transduser type of acoustic lens, comprising a concave transduser of piezoelectrics for generating and focusing acoustic wave.
7. An acoustic lens according to Claim 6, further comprising a metallic pole for supporting said piezoelectrics; a conducting film attached to said piezoelectrics, said metallic pole and conducting film being used as electrodes of said transduser; a sleeve having a plurality of claws extended out of said transduser slightly to prevent it from to be damaged; and a protective film deposited on said conduction film.
8. An acoustic lens according to Claim 7, wherein material of said piezoelectrics is any one of zinc oxide, lithium niobate and quartz.
9. An acoustic lens according to Claim 6-8, wherein said protective film of silicon nitride or adamas is deposited on the conducting film by microwave plasma chemical vapour deposition.
10. A reflection type of acoustic microscope as hereinbefore described with reference to the accompanying drawings.
11. A concave transduser type of acoustic lens as hereinbefore described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90101053 CN1019919C (en) | 1990-03-08 | 1990-03-08 | Reflecting sound microscope with acoustic mirror |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9104911D0 GB9104911D0 (en) | 1991-04-24 |
| GB2242270A true GB2242270A (en) | 1991-09-25 |
Family
ID=4876921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9104911A Withdrawn GB2242270A (en) | 1990-03-08 | 1991-03-08 | Acoustic microscope with concave transducer |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1019919C (en) |
| GB (1) | GB2242270A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001086281A1 (en) * | 2000-05-05 | 2001-11-15 | Acoustical Technologies Singapore Pte Ltd. | Acoustic microscope |
| US8456645B2 (en) | 2007-01-22 | 2013-06-04 | California Institute Of Technology | Method and system for fast three-dimensional imaging using defocusing and feature recognition |
| US8472032B2 (en) | 2007-04-23 | 2013-06-25 | California Institute Of Technology | Single-lens 3-D imaging device using polarization coded aperture masks combined with polarization sensitive sensor |
| US8514268B2 (en) | 2008-01-22 | 2013-08-20 | California Institute Of Technology | Method and device for high-resolution three-dimensional imaging which obtains camera pose using defocusing |
| US8576381B2 (en) | 2007-01-22 | 2013-11-05 | California Institute Of Technology | Method and apparatus for quantitative 3-D imaging |
| US8773514B2 (en) | 2009-08-27 | 2014-07-08 | California Institute Of Technology | Accurate 3D object reconstruction using a handheld device with a projected light pattern |
| US8773507B2 (en) | 2009-08-11 | 2014-07-08 | California Institute Of Technology | Defocusing feature matching system to measure camera pose with interchangeable lens cameras |
| US10182223B2 (en) | 2010-09-03 | 2019-01-15 | California Institute Of Technology | Three-dimensional imaging system |
| US11406264B2 (en) | 2016-01-25 | 2022-08-09 | California Institute Of Technology | Non-invasive measurement of intraocular pressure |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8764665B2 (en) * | 2007-05-03 | 2014-07-01 | Koninklijke Philips N.V. | Methods and apparatuses of microbeamforming with adjustable fluid lenses |
| US10143231B2 (en) | 2013-08-13 | 2018-12-04 | Philip Morris Products S.A. | Smoking article comprising a blind combustible heat source |
| CN104122333B (en) * | 2014-04-12 | 2017-04-05 | 北京工业大学 | Array analytic expression focusing ultrasonic wave transducer |
| CN109374738B (en) * | 2018-09-05 | 2021-07-27 | 广州联声电子科技有限公司 | Ultrasonic microscope and method based on annular array |
| CN109374739B (en) * | 2018-09-05 | 2021-07-27 | 广州联声电子科技有限公司 | Ultrasonic microscope and method based on annular area array |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0032739A1 (en) * | 1980-01-21 | 1981-07-29 | Hitachi, Ltd. | A multielement acoustic transducer, a method of manufacturing the same, and use of the same in an acoustic imaging instrument |
| GB2153997A (en) * | 1984-01-11 | 1985-08-29 | Hitachi Ltd | Acoustic microscope |
| EP0187866A1 (en) * | 1984-07-08 | 1986-07-23 | Noriyoshi Chubachi | Surface ultrasonic wave interference microscope |
| US4659956A (en) * | 1985-01-24 | 1987-04-21 | General Electric Company | Compound focus ultrasonic transducer |
| EP0337575A2 (en) * | 1988-04-13 | 1989-10-18 | Hitachi Construction Machinery Co., Ltd. | Ultrasonic probe and manufacture method for same |
-
1990
- 1990-03-08 CN CN 90101053 patent/CN1019919C/en not_active Expired - Fee Related
-
1991
- 1991-03-08 GB GB9104911A patent/GB2242270A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0032739A1 (en) * | 1980-01-21 | 1981-07-29 | Hitachi, Ltd. | A multielement acoustic transducer, a method of manufacturing the same, and use of the same in an acoustic imaging instrument |
| GB2153997A (en) * | 1984-01-11 | 1985-08-29 | Hitachi Ltd | Acoustic microscope |
| EP0187866A1 (en) * | 1984-07-08 | 1986-07-23 | Noriyoshi Chubachi | Surface ultrasonic wave interference microscope |
| US4659956A (en) * | 1985-01-24 | 1987-04-21 | General Electric Company | Compound focus ultrasonic transducer |
| EP0337575A2 (en) * | 1988-04-13 | 1989-10-18 | Hitachi Construction Machinery Co., Ltd. | Ultrasonic probe and manufacture method for same |
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2363306A (en) * | 2000-05-05 | 2001-12-12 | Acoustical Tech Sg Pte Ltd | An acoustic microscope system including a lens |
| GB2373329A (en) * | 2000-05-05 | 2002-09-18 | Acoustical Tech Sg Pte Ltd | Acoustic microscope |
| GB2363306B (en) * | 2000-05-05 | 2002-11-13 | Acoustical Tech Sg Pte Ltd | Acoustic microscope |
| GB2373329B (en) * | 2000-05-05 | 2003-03-05 | Acoustical Tech Sg Pte Ltd | Acoustic microscope |
| US6840107B2 (en) | 2000-05-05 | 2005-01-11 | Acoustical Technologies Pte Ltd. | Acoustic microscope |
| WO2001086281A1 (en) * | 2000-05-05 | 2001-11-15 | Acoustical Technologies Singapore Pte Ltd. | Acoustic microscope |
| US8576381B2 (en) | 2007-01-22 | 2013-11-05 | California Institute Of Technology | Method and apparatus for quantitative 3-D imaging |
| US8456645B2 (en) | 2007-01-22 | 2013-06-04 | California Institute Of Technology | Method and system for fast three-dimensional imaging using defocusing and feature recognition |
| US9219907B2 (en) | 2007-01-22 | 2015-12-22 | California Institute Of Technology | Method and apparatus for quantitative 3-D imaging |
| US8619126B2 (en) | 2007-04-23 | 2013-12-31 | California Institute Of Technology | Single-lens, single-sensor 3-D imaging device with a central aperture for obtaining camera position |
| US9100641B2 (en) | 2007-04-23 | 2015-08-04 | California Institute Of Technology | Single-lens, single-sensor 3-D imaging device with a central aperture for obtaining camera position |
| US8472032B2 (en) | 2007-04-23 | 2013-06-25 | California Institute Of Technology | Single-lens 3-D imaging device using polarization coded aperture masks combined with polarization sensitive sensor |
| US9736463B2 (en) | 2007-04-23 | 2017-08-15 | California Institute Of Technology | Single-lens, single-sensor 3-D imaging device with a central aperture for obtaining camera position |
| US8514268B2 (en) | 2008-01-22 | 2013-08-20 | California Institute Of Technology | Method and device for high-resolution three-dimensional imaging which obtains camera pose using defocusing |
| US9247235B2 (en) | 2008-08-27 | 2016-01-26 | California Institute Of Technology | Method and device for high-resolution imaging which obtains camera pose using defocusing |
| US8773507B2 (en) | 2009-08-11 | 2014-07-08 | California Institute Of Technology | Defocusing feature matching system to measure camera pose with interchangeable lens cameras |
| US9596452B2 (en) | 2009-08-11 | 2017-03-14 | California Institute Of Technology | Defocusing feature matching system to measure camera pose with interchangeable lens cameras |
| US8773514B2 (en) | 2009-08-27 | 2014-07-08 | California Institute Of Technology | Accurate 3D object reconstruction using a handheld device with a projected light pattern |
| US10182223B2 (en) | 2010-09-03 | 2019-01-15 | California Institute Of Technology | Three-dimensional imaging system |
| US10742957B2 (en) | 2010-09-03 | 2020-08-11 | California Institute Of Technology | Three-dimensional imaging system |
| US11406264B2 (en) | 2016-01-25 | 2022-08-09 | California Institute Of Technology | Non-invasive measurement of intraocular pressure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1019919C (en) | 1993-02-17 |
| CN1054667A (en) | 1991-09-18 |
| GB9104911D0 (en) | 1991-04-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |