CN105526883A - Optical fiber white-light interferometry endoscope three-dimensional measurement system - Google Patents

Optical fiber white-light interferometry endoscope three-dimensional measurement system Download PDF

Info

Publication number
CN105526883A
CN105526883A CN201610034260.XA CN201610034260A CN105526883A CN 105526883 A CN105526883 A CN 105526883A CN 201610034260 A CN201610034260 A CN 201610034260A CN 105526883 A CN105526883 A CN 105526883A
Authority
CN
China
Prior art keywords
optical fiber
endoscope
fiber
fiber optic
optic interferometric
Prior art date
Application number
CN201610034260.XA
Other languages
Chinese (zh)
Inventor
杨树明
张国锋
赵楠
时新宇
Original Assignee
西安交通大学
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 西安交通大学 filed Critical 西安交通大学
Priority to CN201610034260.XA priority Critical patent/CN105526883A/en
Publication of CN105526883A publication Critical patent/CN105526883A/en

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical means
    • G01B11/24Measuring arrangements characterised by the use of optical means for measuring contours or curvatures
    • G01B11/25Measuring arrangements characterised by the use of optical means for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object
    • G01B11/254Projection of a pattern, viewing through a pattern, e.g. moiré

Abstract

Provided is an optical fiber white-light interferometry endoscope three-dimensional measurement system, which comprises an optical fiber interference device and a measuring probe. The optical fiber interference device is formed by a bandwidth coupling optical fiber LED, an optical fiber coupler, piezoelectric ceramics and an optical detector. The measuring probe is formed by optical fiber interference arms and an electronic endoscope CCD. The two optical fiber interference arms are connected with the two output ends of the optical fiber coupler respectively and used for projecting interference fringes to a measured object; the electronic endoscope CCD collects fringe images modulated by the measured object; and three-dimensional measurement of a static object and a dynamic object is realized through a seven-step phase shift algorithm and a windowing Fourier transform method. The system adopts the optical fiber devices and has the advantages of small size, compact structure and good flexibility and the like; the optical fiber white-light interferometry device is utilized to project the fringes, so that fringe density can be improved, and measurement precision is improved, and the system is suitable for high-precision discontinuous surface three-dimensional shape measurement; and with the combination of the endoscope technology and the optical fiber white-light interferometry, the system is allowed to have the advantages of high flexibility and measurement precision.

Description

A kind of optical fiber white light interference endoscope three-dimension measuring system

Technical field:

The present invention relates to the research frontier of the multi-crossed disciplines such as optics, electronic technology, precision optical machinery, microimaging, be specifically related to a kind of optical fiber white light interference endoscope three-dimension measuring system.

Background technology:

In 18 end of the centurys, Germany scientist Bozzine proposes the thought of endoscope first, and is the observation that light source successfully achieves inside of human body rectum and uterus with candle light, and from then on endoscopic technique arises at the historic moment.Endoscope is the exact instrument that a kind of Light Electrical combines, and the object in-vivo tissue can not observed for human eye and structure, be widely used in the fields such as industrial detection, industrial micro Process, medical diagnosis, Minimally Invasive Surgery.Along with the high speed development of CCD technology of preparing and optical fiber sensing technology, from initial rigid pipe endoscope fibre opic endoscope till now and fujinon electronic video endoscope, the development of endoscopic technique is ripe day by day, and the endoscopic technique only for showing and observe can not meet the demand of modern industry and the detection of can't harm of medical domain.Therefore the correlative study of endoscope three-dimensional measurement technology also grows up gradually.

U.S. Wei Lin industrial endoscope adopts single object lens skiametry method to achieve accurate measurement in the spy work of hole first in the early 1990s in last century, its illumination light output window measuring camera lens is carved with one black line, when illumination light by time can form one hacures on testee, the distance change of distance of camera lens object makes the position of hacures on screen move left and right change, and the imaged viewing angle measuring the single object lens on camera lens is constant, video imaging processor in main frame can calculate according to right angle geometric operation principle the distance measured between camera lens and tested surface, the shortcoming of this method is that camera lens and tested surface Relative vertical guarantee measuring accuracy are measured in requirement, thus operation easier is higher, application there is certain limitation.For solving this difficult problem, there is again doublet measuring technique subsequently, binocular stereo vision principle is adopted to carry out the three-dimensional reconstruction of measurement point, the method no longer needs camera lens vertical with testee, reduce operational difficulty to a certain extent, but according to the design concept of doublet, the relatively single object lens in the visual field of its camera lens reduce by half, the region that can measure is obviously limited, and the correctness of the position of measurement point and match point thereof exists possibility that is artificial and systematic error.For solving this difficult problem, Wei Lin company proposed again a kind of 3D phasescan endoscope measuring technique in 2010, with single object lens skiametry method, doublet measurement in space method is compared, this technology peeps the breakthrough measuring technique of of detection field in being, by two visible LED optical gate matrixs on the three dimensional Phase scanning lens of measuring sonde front end, many the parallel hatches intersections superposition of being launched by stroboscopic projects measured object on the surface, the change of body surface geometric configuration can cause the striped occurring distortion, these distortion stripeds contain the three-dimensional appearance information of object, and accurately can obtain the three-dimensional point cloud coordinate of body surface comparatively dense, clear 3D shape and the physical dimension presenting measured target, realize only just realizing observation with a measuring head and measuring.Subsequently, the people such as AntonSchick propose a kind of miniature 3-D scanning endoscope based on active principle of triangulation and numeric structure light shadow casting technique, its probe diameter is only 3.6mm, can carry out three-dimensional measurement, but measuring accuracy can only reach 0.1mm to the pipeline of arbitrary shape.

In sum, mainly there is following problem in the three-dimensional measurement endoscopic technique of two kinds of most widely used at present main flows: adopt the endoscopic system Stereo matching precision of technique of binocular stereoscopic vision not high, measuring accuracy is also not high and cloud data is little; Adopt the endoscopic system measuring accuracy of numeric structure light projected phase measuring technique to limit by projector equipment resolution, its measuring accuracy is not high yet.Based on the fiber interference fringe shadow casting technique of Young's double-slot interference principle, the projection of high density striped can be realized, Phase shift precision is high, speed is fast, compare other striped projection systems and there is unique advantage, whole audience high-precision three-dimensional topography measurement can be realized, therefore in conjunction with fibre coherence technique endoscopic system due to fiber size little, interference fringe resolution advantages of higher becomes the study hotspot of three-dimensional measurement endoscopic system.

Summary of the invention:

The object of the present invention is to provide a kind of optical fiber white light interference endoscope three-dimension measuring system.

For achieving the above object, the present invention adopts following technical scheme to realize:

A kind of optical fiber white light interference endoscope three-dimension measuring system, comprises fiber optic interferometric device and measuring sonde; Wherein,

Fiber optic interferometric device comprises bandwidth coupled fiber LED and fiber coupler;

Measuring sonde inside is integrated with fiber optic interferometric arm and fujinon electronic video endoscope CCD;

During work, the light that bandwidth coupled fiber LED sends inputs through one end of fiber coupler, exported by two fiber optic interferometric arms after light splitting, the port of two fiber optic interferometric arms forms the stripe pattern of optical fiber mach pool moral interference fringe mode of delivery generation as Young double-pore structure, project testee surface; Fujinon electronic video endoscope CCD gathers the stripe pattern after testee modulation, and inputs computing machine and carry out image procossing and phase calculation, obtains measured object three-dimensional appearance data.

The present invention further improves and is, fiber optic interferometric device also comprises the first piezoelectric ceramics, the second piezoelectric ceramics and photo-detector, and two fiber optic interferometric arms are wrapped on the first piezoelectric ceramics and the second piezoelectric ceramics, as Phaseshift controlling and phase compensation respectively; Three-dimension measuring system also comprises signal generator, closed control circuit and phase controller; Wherein,

During work, light beam, at the end face generation Fresnel reflection of two fiber optic interferometric arms, makes part Guang Yanyuan road return and interferes at the fiber coupler other end, thus forms Optical Fiber Michelson Interferometer; Signal generator controls the first piezoelectric ceramics and produces certain phase shift, send into closed control circuit after photo-detector conversion Michelson interference signal and carry out signal condition, then export to the second piezoelectric ceramics by phase controller and disturb the phase error caused with compensate for ambient.

The present invention further improves and is, closed control circuit comprises the differential amplifier, low-pass filter, subtracter, Hi-pass filter and the PID controller that connect successively.

The present invention further improves and is, for static measurement, adopts seven step phase shift algorithm, and in conjunction with fiber interference fringe projection model, recovers object dimensional topographical information; For kinetic measurement, enlarge section method is adopted to carry out phase calculation.

Relative to prior art, the invention has the beneficial effects as follows:

1) in present system, optical interferometric devices comprises LED light source, photo-coupler and photo-detector all adopt optical fibre device, have that size is little, a feature such as compact conformation, dirigibility are good;

2) adopt fiber optic interferometric device to project striped, can fringe density be improved, and then improve measuring accuracy;

3) measuring system is using bandwidth coupled fiber LED as light source, namely adopts Light bulb phase-shift interfering method to overcome the limitation of traditional monochromatic light phase-shifting interferometry existence, can be used to coarse, the discontinuous object appearance of measured surface;

4) endoscopic technique is combined with optical fiber white light interference technology, make present system possess dirigibility and the high feature of measuring accuracy simultaneously.

Accompanying drawing illustrates:

Fig. 1 is endoscope three-dimension measuring system schematic diagram.

Fig. 2 is measuring sonde schematic diagram.

Fig. 3 is closed control circuit structural representation.

In figure: 1-bandwidth coupled fiber LED, 2-fiber coupler, 3-first piezoelectric ceramics, 4-second piezoelectric ceramics, 5-photo-detector, 6-fiber optic interferometric arm, 7-fujinon electronic video endoscope CCD, 8-signal generator, 9-closed control circuit, 10-phase controller, 11-testee, 12-computing machine.

Embodiment:

Below in conjunction with accompanying drawing, the present invention is described in further detail.

As shown in Figure 1, a kind of optical fiber white light interference endoscope of the present invention three-dimension measuring system, comprises fiber optic interferometric device and measuring sonde; Wherein, fiber optic interferometric device comprises bandwidth coupled fiber LED1, fiber coupler 2, first piezoelectric ceramics 3, second piezoelectric ceramics 4 and photo-detector 5; Measuring sonde is integrated with fiber optic interferometric arm 6 and fujinon electronic video endoscope CCD7.In addition, measuring system also comprises for the signal generator 8 of phase shifting control and phase compensation, closed control circuit 9 and phase controller 10, and for image procossing and three computing machines rebuild 12.

During work, the light that bandwidth coupled fiber LED1 sends is inputted by one end of fiber coupler 2, exported by two fiber optic interferometric arm output terminals 6 after light splitting, thus formation Young's double pinhole interference, the stripe pattern that optical fiber mach pool moral interference fringe mode of delivery produces is formed when meeting far field near-axial condition, should be as far as possible isometric when two fiber optic interferometric arms 6 cut, wherein a fiber optic interferometric arm 6 is wrapped on piezoelectric ceramics 3 and controls as fiber phase, realize phase shift, another fiber optic interferometric arm 6 to be also wrapped on piezoelectric ceramics 4 as phase compensator, is used for improving fringe contrast.Light beam, at the end face generation Fresnel reflection of two fiber optic interferometric arms 6, makes segment beam return along former road and interfere at fiber coupler 2 other end, thus forms Optical Fiber Michelson Interferometer.Photo-detector 5 for receiving the interference signal of Optical Fiber Michelson Interferometer, and exports the phase-difference control being used for fiber optic interferometric arm.The arm end projection interference fringe of two fiber optic interferometric arms 6, to measured object 11 surface, gathers the stripe pattern after measured object surface modulation by fujinon electronic video endoscope CCD7, processes just can obtain surface topography information to this image.

As shown in Figure 2, the inner structure of measuring sonde is made up of fiber optic interferometric arm 6, fujinon electronic video endoscope CCD7 and plane mirror three part, consider that endoscope will stretch into interior of articles, for avoiding the injury of measuring head and facilitating imaging, add catoptron to change light path.Relative position is kept to fix and angled placement projection port and endoscope pick-up lens, interference fringe is refracted on testee by level crossing, endoscope camera head, by the stripe pattern of plane mirror shooting through measured object modulation, finally realizes side direction shooting object.

As shown in Figure 3, closed control circuit comprises the differential amplifier connected successively, low-pass filter, subtracter, Hi-pass filter and PID controller, wherein, closed control circuit receives the voltage signal that photo-detector exports, signal amplification is carried out by differential amplifier, by low-pass filter with after the noise amplified in filtering part passband, difference is asked to obtain error signal with setting voltage, the impact that error signal is not calculated accurately with further compensation making voltmeter through Hi-pass filter, output signal by exporting to piezoelectric ceramics fiber phase controller after PID controller afterwards, adjust the second piezoelectric ceramics 4, it is made to move to the direction contrary with producing error signal, the phase error caused is disturbed with compensate for ambient.In addition, signal generator produces a sinusoidal signal and is applied on the first piezoelectric ceramics 3, makes it produce a sinusoidal displacement, then carries out acquisition and processing to the output signal of photo-detector follow up amplifier, draw fringe visibility, thus obtain setting voltage.

Claims (4)

1. an optical fiber white light interference endoscope three-dimension measuring system, is characterized in that, comprises fiber optic interferometric device and measuring sonde; Wherein,
Fiber optic interferometric device comprises bandwidth coupled fiber LED (1) and fiber coupler (2);
Measuring sonde inside is integrated with fiber optic interferometric arm (6) and fujinon electronic video endoscope CCD (7);
During work, the light that bandwidth coupled fiber LED (1) sends inputs through one end of fiber coupler (2), exported by two fiber optic interferometric arms (6) after light splitting, the port of two fiber optic interferometric arms (6) forms the stripe pattern of optical fiber mach pool moral interference fringe mode of delivery generation as Young double-pore structure, project testee (11) surface; Fujinon electronic video endoscope CCD (7) gathers the stripe pattern after testee (11) modulation, and inputs computing machine (12) and carry out image procossing and phase calculation, obtains measured object three-dimensional appearance data.
2. optical fiber white light interference endoscope three-dimension measuring system according to claim 1, it is characterized in that, fiber optic interferometric device also comprises the first piezoelectric ceramics (3), the second piezoelectric ceramics (4) and photo-detector (5), two fiber optic interferometric arms (6) are wrapped on the first piezoelectric ceramics (3) and the second piezoelectric ceramics (4), as Phaseshift controlling and phase compensation respectively; Three-dimension measuring system also comprises signal generator (8), closed control circuit (9) and phase controller (10); Wherein,
During work, light beam, at the end face generation Fresnel reflection of two fiber optic interferometric arms (6), makes part Guang Yanyuan road return and interferes at fiber coupler (2) other end, thus forms Optical Fiber Michelson Interferometer; Signal generator (8) controls the first piezoelectric ceramics (3) and produces certain phase shift, send into closed control circuit (9) after photo-detector (5) conversion Michelson interference signal and carry out signal condition, then export to the second piezoelectric ceramics (4) by phase controller (10) and disturb the phase error caused with compensate for ambient.
3. optical fiber white light interference endoscope three-dimension measuring system according to claim 2, is characterized in that, closed control circuit (9) comprises the differential amplifier, low-pass filter, subtracter, Hi-pass filter and the PID controller that connect successively.
4. optical fiber white light interference endoscope three-dimension measuring system according to claim 1, is characterized in that, for static measurement, adopts seven step phase shift algorithm, and in conjunction with fiber interference fringe projection model, recovers object dimensional topographical information; For kinetic measurement, enlarge section method is adopted to carry out phase calculation.
CN201610034260.XA 2016-01-19 2016-01-19 Optical fiber white-light interferometry endoscope three-dimensional measurement system CN105526883A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610034260.XA CN105526883A (en) 2016-01-19 2016-01-19 Optical fiber white-light interferometry endoscope three-dimensional measurement system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610034260.XA CN105526883A (en) 2016-01-19 2016-01-19 Optical fiber white-light interferometry endoscope three-dimensional measurement system

Publications (1)

Publication Number Publication Date
CN105526883A true CN105526883A (en) 2016-04-27

Family

ID=55769259

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610034260.XA CN105526883A (en) 2016-01-19 2016-01-19 Optical fiber white-light interferometry endoscope three-dimensional measurement system

Country Status (1)

Country Link
CN (1) CN105526883A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018132022A1 (en) * 2017-01-14 2018-07-19 Sds Optic Sp. Z O.O. Device for detecting and/or determining the concentration of an analyte present in a tissue and a method and use of this device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1156751A (en) * 1997-08-28 1999-03-02 Olympus Optical Co Ltd Endoscope
JP2000126188A (en) * 1999-11-08 2000-05-09 Olympus Optical Co Ltd Optical tomographic imaging apparatus
DE19742264C2 (en) * 1997-09-25 2001-09-20 Vosseler Erste Patentverwertun Endoscope
CN101147669A (en) * 2007-10-25 2008-03-26 浙江大学 Integrated optical coherence chromatographic imaging and laser inducing fluorescent-spectrum single optical fiber endoscopy system
CN102679906A (en) * 2012-05-28 2012-09-19 西安交通大学 Integrated system for online measurement of nanometer surface morphology
CN103983211A (en) * 2014-05-22 2014-08-13 天津大学 Three-dimensional shape measuring system of fringe projection based on sine phase modulation four-step integral

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1156751A (en) * 1997-08-28 1999-03-02 Olympus Optical Co Ltd Endoscope
DE19742264C2 (en) * 1997-09-25 2001-09-20 Vosseler Erste Patentverwertun Endoscope
JP2000126188A (en) * 1999-11-08 2000-05-09 Olympus Optical Co Ltd Optical tomographic imaging apparatus
CN101147669A (en) * 2007-10-25 2008-03-26 浙江大学 Integrated optical coherence chromatographic imaging and laser inducing fluorescent-spectrum single optical fiber endoscopy system
CN102679906A (en) * 2012-05-28 2012-09-19 西安交通大学 Integrated system for online measurement of nanometer surface morphology
CN103983211A (en) * 2014-05-22 2014-08-13 天津大学 Three-dimensional shape measuring system of fringe projection based on sine phase modulation four-step integral

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
伯恩 等: "《基于CORDIC的交流相位跟踪零差补偿方法及其实现》", 《传感技术学报》 *
张超: "《光纤干涉条纹投射相位测量轮廓术关键技术研究》", 《中国博士学位论文全文数据库 信息科技辑》 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018132022A1 (en) * 2017-01-14 2018-07-19 Sds Optic Sp. Z O.O. Device for detecting and/or determining the concentration of an analyte present in a tissue and a method and use of this device

Similar Documents

Publication Publication Date Title
US10258437B2 (en) Apparatus and method for measuring surface topography optically
US20150373321A1 (en) Six degree-of-freedom triangulation scanner and camera for augmented reality
US9219907B2 (en) Method and apparatus for quantitative 3-D imaging
CN106662434B (en) Relative movement direction inclined confocal measuring surface form of the confocal plane relative to confocal equipment and sample
US20150342460A1 (en) Imaging and visualization systems, instruments, and methods using optical coherence tomography
JP5583761B2 (en) 3D surface detection method and apparatus using dynamic reference frame
JP3549961B2 (en) Optical coherence tomography corneal mapping system
CN102573602B (en) Endoscope and method for use thereof
CN102788558B (en) Three-dimensional deformation measuring system and three-dimensional deformation measuring method combining speckle correlation and speckle interference
EP0968687B1 (en) 3D-camera for measurement of surface structures, in particular for dentistry
US20190191141A1 (en) Motion blur compensation
JP4933827B2 (en) Method for reconstructing ear canal and computer readable program storage device
US20180049641A1 (en) Detection of a movable object when 3d scanning a rigid object
US8134719B2 (en) 3-D imaging using telecentric defocus
JP4343341B2 (en) Endoscope device
Schmalz et al. An endoscopic 3D scanner based on structured light
WO2015105980A1 (en) Measuring topography of aspheric and other non-flat surfaces
US8425037B2 (en) Intraoperative imaging system and apparatus
JP5680826B2 (en) Data generation system using endoscopic technology for encoding one or more spectra
US9860520B2 (en) Method, system, apparatus, and computer program for 3D acquisition and caries detection
CN102232824B (en) Characteristic image extraction method and ophthalmologic apparatus
Xie et al. Fiber-optic-bundle-based optical coherence tomography
CN103344569B (en) Polarization complex frequency domain optical coherence tomography imaging method and system
Liu et al. Distortion-free freehand-scanning OCT implemented with real-time scanning speed variance correction
Huang et al. Dynamic three-dimensional sensing for specular surface with monoscopic fringe reflectometry

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination