CN201382849Y - Flow field display device based on digital holography - Google Patents
Flow field display device based on digital holography Download PDFInfo
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- CN201382849Y CN201382849Y CN200920032229U CN200920032229U CN201382849Y CN 201382849 Y CN201382849 Y CN 201382849Y CN 200920032229 U CN200920032229 U CN 200920032229U CN 200920032229 U CN200920032229 U CN 200920032229U CN 201382849 Y CN201382849 Y CN 201382849Y
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- expanding collimation
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Abstract
The utility model discloses a flow field display device based on digital holography. A beam splitting device is arranged in an optical path emitted by a laser; a beam expanding collimation device which changes a beam into parallel light and a total reflection mirror which changes the direction of the optical path are arranged in the optical path of a first beam in sequence; a beam expanding collimation device which changes a beam into parallel light, a total reflection mirror which changes the direction of the optical path, and a sample of the flow field to be tested are arranged in sequence in the optical path of a second beam; an imaging device which images the flow field to be tested on the surface of an image collecting device is arranged between the sample of the flow field to be tested and the image collecting device; a beam splitting device which reflects the first beam to be parallel to the direction of the second beam is arranged between the imaging device and the image collecting device; and the image collecting device is connected with a computer. The utility model has certain flexibility, can improve measuring sensitivity, can realize various complex amplitude calculations and operations, and improves the speed and accuracy during data processing process so as to prevent errors.
Description
Technical field
The utility model relates to a kind of stream field displaying apparatus, belongs to field of optical measuring technologies.
Background technology
The flow field is the occupied space of fluid motion, owing to can not be directly receive with eyes or video-unit, adds that detection process can not interference flowing field, makes conventional detection instrument can't accurately measure flow field state.Again because after introducing measuring element, the meeting stream field exerts an influence and is difficult to realize measurement of full field, so up to the present, the research work of stream field focuses mostly in the numerical evaluation of flow field theory.Tradition flow field display technique is mostly based on adding different trace particles, for example decoration method etc.The laser inductive fluorescence method that Stocks was invented in 1852 has realized that the Two dimensional Distribution of concentration field and fluctuation velocity field shows, but the time to image interpretation, often just judge fluidal texture with intuition by rule of thumb, and the relation between concentration field and the fluctuation velocity field is very complicated on the display image, and this may cause experimental result to get the wrong sow by the ear.Particle image velocimetry (PIV) technology that grow up the nineties in 20th century can cooperate with FLOW VISUALIZATION, and the quantitative measurment turbulent-velocity field reflects flow field velocity by taking and measure the speed of following the particle (trace particle) of fluid motion in the flow field.Yet, more than two kinds of Technology Needs add corresponding trace particle in advance, and still there is the problem of " following " between particle and the fluid, what reality reflected is the motion of tracer in flowing, rather than real fluid motion, and tracer may produce the field and disturb, and some needs artificial judgement, thereby accuracy is not high.Traditional FLOW VISUALIZATION method utilizes the method that adds coloured dyestuff intuitively to observe flow field state and variation thereof more, and not only observable flow field kind is limited, and degree of accuracy is low, is difficult to accomplish quantitative test.In a word, because the traditional limitation of flow field display packing aspect the demonstration of flow field, press for and make improvements.
Summary of the invention
For fear of the deficiencies in the prior art part, the utility model proposes a kind of stream field displaying apparatus based on digital holography, can overcome in the conventional flow field measurement process used particle stream field and cause and disturb and problem such as followability is relatively poor.
The technical solution adopted for the present invention to solve the technical problems is: comprise laser instrument 1, beam splitting arrangement 2, the first beam-expanding collimation devices 3, completely reflecting mirror 4, imaging device 6, beam splitting arrangement 7, the second beam-expanding collimation device 8, completely reflecting mirror 9, image collecting device 10 and computing machine 11; The beam splitting arrangement 2 that forms first light beam and second light beam is set in the light path that laser instrument 1 sends; In the light path of first light beam, a beam-expanding collimation device 8 that light beam is become directional light is set; The completely reflecting mirror 9 that changes optical path direction is set afterwards; In the light path of second light beam, a beam-expanding collimation device 3 that light beam is become directional light is set, set gradually the completely reflecting mirror 4 and the flow field to be measured sample 5 that change optical path direction afterwards, the imaging device 6 that flow field to be measured is imaged in image collecting device 10 surfaces is set between flow field to be measured sample 5 and image collecting device 10; Between imaging device 6 and image collecting device 10, be provided with one with first beam reflection to the beam splitting arrangement 7 parallel with second beam direction.Image collecting device 10 is connected with computing machine 11, is used for receiving in real time first light beam and the formed hologram of second beam interference.
Described beam splitting arrangement 2 is fixedly splitting ratio beam splitter, the adjustable beam splitter of splitting ratio or fiber coupler.
Described completely reflecting mirror 4,9 act as the change direction of beam propagation, in full fibre system, when promptly beam splitting arrangement 2 was fiber coupler, completely reflecting mirror can save need not.
The described first beam-expanding collimation device 3, the second beam-expanding collimation device 8 can the expanded laser light beam diameters, and into the parallel beam of changing, and are spatial filter, or lens combination, or the combination of optical fiber collimator and spatial filter.
Described flow field to be measured sample 5 is the flow fields that produce various states such as laminar flow, turbulent flow, is gas field or liquid field.
Described imaging device 6 is inverted telescope system, microcobjective, single lens or lens combination.
Described beam splitting arrangement 7 is Amici prism or semi-transparent semi-reflecting lens.
Described image collecting device 10 can replace traditional holographic dry plate, and the real time record digital hologram is a CCD charge-coupled image sensor or a cmos device.
The invention has the beneficial effects as follows: the imaging device 6 in (1) this stream field displaying apparatus can be selected different components for use according to the difference of flow field to be measured size, thereby have certain dirigibility to measuring the different area flow field, solve image collecting device area and the limited problem of pixel cell.Utilization microcobjective device can carry out measurement by magnification with the miniflow field, perhaps uses the inverted telescope device larger area flow field can be dwindled and images in image collecting device, improves the sensitivity of measuring.(2) utilize this stream field displaying apparatus, the digital hologram that image collecting device write down is through Computer Processing, the acquisition of numerical reconstruction hologram comprises the COMPLEX AMPLITUDE of the thing light wave fields of amplitude and phase place, can realize various complex amplitude computings and operation, improve the speed and the precision of data handling procedure, can be used for studying the transient process in flow field, realize that really the flow field shows the real time implementation of measuring; (3) owing to there is not disturbance flow field such as instrument probe in the process of utilizing this stream field displaying apparatus stream field to measure, light beam does not cause interference to it after by flow field to be measured, thereby avoids consequent error.
The present invention is further described below in conjunction with drawings and Examples.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment 1.
Fig. 2 is the structural representation of the utility model embodiment 2.
Fig. 3 is the structural representation of the utility model embodiment 3.
Fig. 4 is the structural representation of the utility model embodiment 4.
Among the figure, 1-laser instrument, 2-beam splitting arrangement, 3-beam-expanding collimation device, 4-completely reflecting mirror, 6-flow field to be measured sample, 6-imaging device, 7-beam splitting arrangement, 8-beam-expanding collimation device, 9-completely reflecting mirror, 10-image collecting device, 11-computing machine.
Embodiment
Embodiment 1: as shown in Figure 1, comprise laser instrument 1, beam splitting arrangement 2, beam-expanding collimation device 3, completely reflecting mirror 4, flow field to be measured sample 5, imaging device 6, beam splitting arrangement 7, beam-expanding collimation device 8, completely reflecting mirror 9, image collecting device 10 and computing machine 11.
In the present embodiment, beam splitting arrangement 2 adopts the adjustable beam splitter of splitting ratio; Flow field to be measured sample 5 adopts liquid flow field; Imaging device 6 is selected the inverted telescope group for use; Beam-expanding collimation device 3 and beam-expanding collimation device 8 are the beam expanding lens group of being made up of microscope and convex lens; Beam splitting arrangement 7 is selected Amici prism for use, and image collecting device 10 is selected area array CCD for use.
The course of work of present embodiment is: laser instrument 1 sends the single linearly polarized light of wavelength, is divided into mutually perpendicular first light beam of direction and second light beam by the adjustable beam splitter 2 of splitting ratio.First light beam is expanded bundle and is collimated into directional light by parallel beam expand device 3, is passed flow field 6 to be measured after completely reflecting mirror 4 reflections, selects suitable inverted telescope group 6, and the light beam complete imaging in feasible process flow field 6 to be measured is at the CCD10 surface location.
Second light beam is reflected by completely reflecting mirror 9 after being expanded bundle and be collimated into directional light by beam-expanding collimation device 8, interferes on the CCD10 surface as the directional light and first light beam after beam splitting arrangement 7 reflections.
Regulate the distance between inverted telescope group 6 and CCD10 and flow field to be measured 6 threes, make flow field to be measured 6 process inverted telescope groups, 6 blur-free imagings on the CCD10 surface.In the CCD10 recording interval, regulate first and second angle of beams, take the digital hologram interferogram under the two kinds of situations in static flow field and variation flow field then respectively.At last, the digital hologram of two kinds of situations is carried out numerical value reconstruct by computing machine 11 by means such as fast fourier transform algorithm and Digital Image Processing, the digital hologram that utilizes the re-expose principle of holography promptly can obtain the flow field reproduces picture.
The beneficial effect of present embodiment is the inverted telescope that can select different camera lens models according to tested flow field size, and no matter flow field relative CCD target surface size is less, all has the inverted telescope of respective model to make its complete imaging at the CCD target surface; For the inverted telescope that front and back camera lens model is determined, parameters such as its object image distance are known, make the process of regulating the flow field blur-free imaging simple and convenient; The precision design of inverted telescope has reduced the various aberrations that produce in the imaging process to a great extent.
Another beneficial effect of present embodiment is the enlargement ratio that object space changes does not influence image.The telecentric mirror head is observed from identical visual angle and is shown whole object, therefore, and three-dimensional feature occurs in the time of similar use simple lens can not occurring perspective distortion and picture position mistake.Even the vertical darker interior zone in the flow field is also high-visible in whole visual field, therefore, when detecting three-dimensional flow field or under picture size and the crucial situation of shape accuracy, the device in the present embodiment is very useful.
Embodiment 2: as shown in Figure 2, comprise laser instrument 1, beam splitting arrangement 2, beam-expanding collimation device 3, completely reflecting mirror 4, flow field to be measured sample 5, lens 6, beam splitting arrangement 7, beam-expanding collimation device 8, completely reflecting mirror 9, image collecting device 10 and computing machine 11.
As different from Example 1, the single lens of imaging device 6 usefulness replace the inverted telescope group.
The course of work of present embodiment is: laser instrument 1 sends the single linearly polarized light of wavelength, is divided into mutually perpendicular first light beam of direction and second light beam by the adjustable beam splitter 2 of splitting ratio.First light beam is expanded bundle and is collimated into directional light by parallel beam expand device 3, is passed flow field 6 to be measured after completely reflecting mirror 4 reflections, selects suitable lens 6, and the light beam complete imaging in feasible process flow field 6 to be measured is at the CCD10 surface location.
Second light beam is reflected by completely reflecting mirror 9 after being expanded bundle and be collimated into directional light by beam-expanding collimation device 8, interferes on the CCD10 surface as the directional light and first light beam after beam splitting arrangement 7 reflections.
Regulate the distance between lens 6 and CCD10 and flow field to be measured 6 threes, make flow field to be measured 6 process lens, 6 blur-free imagings on the CCD10 surface.In the CCD10 recording interval, regulate first and second angle of beams, take the digital hologram interferogram under the two kinds of situations in static flow field and variation flow field then respectively.At last, the digital hologram of two kinds of situations is carried out numerical value reconstruct by computing machine 11 by means such as fast fourier transform algorithm and Digital Image Processing, the digital hologram that utilizes the re-expose principle of holography promptly can obtain the flow field reproduces picture.
The beneficial effect of present embodiment is that convex lens need not to change because of the change in a big way of beam area, and is simple to operate, flexibly; When using simple lens to observe the different area flow field of measuring same sample, the result of processing has very high comparability.
Embodiment 3: as shown in Figure 3, comprise laser instrument 1, beam splitting arrangement 2, beam-expanding collimation device 3, completely reflecting mirror 4, flow field to be measured sample 5, microcobjective 6, beam splitting arrangement 7, beam-expanding collimation device 8, completely reflecting mirror 9, image collecting device 10 and computing machine 11.
As different from Example 1, the single microcobjective of imaging device 6 usefulness replaces the inverted telescope group.
The course of work of present embodiment is: laser instrument 1 sends the single linearly polarized light of wavelength, is divided into mutually perpendicular first light beam of direction and second light beam by the adjustable beam splitter 2 of splitting ratio.First light beam is expanded bundle and is collimated into directional light by beam-expanding collimation device 3, is passed flow field 6 to be measured after completely reflecting mirror 4 reflections, selects suitable microcobjective 6, and the light beam complete imaging in feasible process flow field 6 to be measured is at the CCD10 surface location.
Second light beam is reflected by completely reflecting mirror 9 after being expanded bundle and be collimated into directional light by beam-expanding collimation device 8, interferes on the CCD10 surface as the directional light and first light beam after beam splitting arrangement 7 reflections.
Regulate the distance between microcobjective 6 and CCD10 and flow field to be measured 6 threes, make flow field to be measured 6 process microcobjectives, 6 blur-free imagings on the CCD10 surface.In the CCD10 recording interval, regulate first and second angle of beams, take the digital hologram interferogram under the two kinds of situations in static flow field and variation flow field then respectively.At last, the digital hologram of two kinds of situations is carried out numerical value reconstruct by computing machine 11 by means such as fast fourier transform algorithm and Digital Image Processing, the digital hologram that utilizes the re-expose principle of holography promptly can obtain the flow field reproduces picture.
The beneficial effect of present embodiment is to be applicable to the miniflow field measurement.By adjusting the position between microcobjective 6, CCD10 and the flow field sample three, the subtle change of miniflow field can be amplified to the distinguishable scope of CCD, make full use of CCD target surface size.Because microcobjective true field diameter (i.e. the image range that can see by microscope) is about the 11-20 millimeter, the object lens enlargement ratio is generally 5～100 times, and with respect to the inverted telescope among the embodiment 1, the measurable flow scene is long-pending littler, the enlargement factor scope is bigger, uses simple relatively.
Embodiment 4: as shown in Figure 4, comprise laser instrument 1, beam splitting arrangement 2, beam-expanding collimation device 3, flow field to be measured sample 5, inverted telescope 6, beam splitting arrangement 7, beam-expanding collimation device 8, image collecting device 10 and computing machine 11.
As different from Example 3, do not have completely reflecting mirror 4,9 in the device, beam splitting arrangement 2 usefulness fiber couplers replace the adjustable beam splitter of splitting ratio.Beam-expanding collimation device 3 and beam-expanding collimation device 8 are made up of optical fiber collimator and spatial filter two parts.
The course of work of present embodiment is: the light that laser instrument sends arrives fiber coupler 2 by Optical Fiber Transmission, be divided into first light beam and second light beam by fiber coupler 2, first light beam is collimated into thin directional light through Optical Fiber Transmission by the optical fiber collimator in the parallel beam expand device 3, being expanded bundle and collimated back one-tenth facula area by the spatial filter in the parallel beam expand device 3 again is the directional light of flow field area size to be measured, pass flow field 6 to be measured, select suitable microcobjective 6, the light beam complete imaging in feasible process flow field 6 to be measured is at the CCD10 surface location.
Second light beam is collimated into thin directional light through Optical Fiber Transmission by the optical fiber collimator in the parallel beam expand device 3 by beam-expanding collimation device 8, expand bundle and the bigger directional light of collimation back one-tenth facula area by the spatial filter in the parallel beam expand device 3 again, after beam splitting arrangement 7 reflections, interfere on the CCD10 surface as the directional light and first light beam.
Regulate the distance between microcobjective 6 and CCD10 and flow field to be measured 6 threes, make flow field to be measured 6 process microcobjectives, 6 blur-free imagings on the CCD10 surface.In the CCD10 recording interval, regulate first and second angle of beams, take the digital hologram interferogram under the two kinds of situations in static flow field and variation flow field then respectively.At last, the digital hologram of two kinds of situations is carried out numerical value reconstruct by computing machine 11 by means such as fast fourier transform algorithm and Digital Image Processing, the digital hologram that utilizes the re-expose principle of holography promptly can obtain the flow field reproduces picture.
The beneficial effect of present embodiment is with optical fiber instead of part optical device, not only improved the anti-vibration ability of device, avoided producing than mistake, and reduced the volume of device to a certain extent, helped equipment miniaturization because of the light path instability makes measurement result.
Claims (7)
1, a kind of stream field displaying apparatus based on digital holography, comprise laser instrument, beam splitting arrangement, the first beam-expanding collimation device, completely reflecting mirror, imaging device, beam splitting arrangement, the second beam-expanding collimation device, completely reflecting mirror, image collecting device and computing machine is characterized in that: the beam splitting arrangement that forms first light beam and second light beam is set in the light path that laser instrument sends; In the light path of first light beam, be provided with one light beam become the beam-expanding collimation device of directional light, the completely reflecting mirror that changes optical path direction is set afterwards; In the light path of second light beam, a beam-expanding collimation device that light beam is become directional light is set, set gradually the completely reflecting mirror and the flow field to be measured sample that change optical path direction afterwards, the imaging device that flow field to be measured is imaged in the image collecting device surface is set between flow field to be measured sample and image collecting device; Between imaging device and image collecting device, be provided with one with first beam reflection to the beam splitting arrangement parallel with second beam direction; Image collecting device is connected with computing machine, receives first light beam and the formed hologram of second beam interference in real time.
2, a kind of stream field displaying apparatus based on digital holography according to claim 1 is characterized in that: described beam splitting arrangement is fixedly splitting ratio beam splitter or the adjustable beam splitter of splitting ratio.
3, a kind of stream field displaying apparatus based on digital holography according to claim 1, it is characterized in that: described beam splitting arrangement is a fiber coupler, and completely reflecting mirror saves need not.
4, a kind of stream field displaying apparatus based on digital holography according to claim 1 is characterized in that: the described first beam-expanding collimation device and the second beam-expanding collimation device are the combination of spatial filter, lens combination or optical fiber collimator and spatial filter.
5, a kind of stream field displaying apparatus based on digital holography according to claim 1 is characterized in that: described imaging device is inverted telescope system, microcobjective, single lens or lens combination.
6, a kind of stream field displaying apparatus based on digital holography according to claim 1, it is characterized in that: described beam splitting arrangement is Amici prism or semi-transparent semi-reflecting lens.
7, a kind of stream field displaying apparatus based on digital holography according to claim 1, it is characterized in that: described image collector is changed to a CCD charge-coupled image sensor or a cmos device.
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| CN200920032229U CN201382849Y (en) | 2009-03-17 | 2009-03-17 | Flow field display device based on digital holography |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102122063A (en) * | 2011-03-09 | 2011-07-13 | 北京工业大学 | Inverted digital holographic microscope |
| CN102207613A (en) * | 2011-06-03 | 2011-10-05 | 北京工业大学 | Point source reference optical distortion compensation digital holography phase contrast microscope |
| CN102435415A (en) * | 2011-09-05 | 2012-05-02 | 中国人民解放军国防科学技术大学 | NPLS (Nano-tracer Plannar Laser Scattering) flow display system with enhanced signal to noise ratio and imaging method thereof |
| CN105242512A (en) * | 2015-09-29 | 2016-01-13 | 南京理工大学 | Telecentric optical structure-based transmission-type digital holographic microscopic imaging device |
| CN105890671A (en) * | 2016-06-15 | 2016-08-24 | 浙江大学 | Probe for three-dimensional measurement of particle field in high temperature environment |
| CN107389207A (en) * | 2017-04-27 | 2017-11-24 | 南京航空航天大学金城学院 | A kind of Michelson's interferometer and its measuring method based on Digital Holography |
| CN107748052A (en) * | 2017-11-25 | 2018-03-02 | 南京航空航天大学 | A kind of device of the measurement flap gap flowing based on PIV methods |
| CN109119007A (en) * | 2018-09-17 | 2019-01-01 | 北京唐冠天朗科技开发有限公司 | A kind of product multidimensional display systems and method and application |
| CN110941024A (en) * | 2019-12-11 | 2020-03-31 | 江西莱利电气有限公司 | Device and method for detecting foreign matters in fan based on interference imaging |
| CN112098039A (en) * | 2020-09-08 | 2020-12-18 | 中国科学院力学研究所 | System and method for measuring pulsation density of hypersonic flow field |
| CN112730875A (en) * | 2021-03-31 | 2021-04-30 | 中国空气动力研究与发展中心高速空气动力研究所 | Shutter integrated device, control system and time sequence control method |
| CN112945083A (en) * | 2021-01-29 | 2021-06-11 | 中国科学院长春光学精密机械与物理研究所 | Parallel phase shift digital holographic microscopic imaging system with optical fiber interconnection |
| CN113092056A (en) * | 2021-04-25 | 2021-07-09 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Method for measuring three-dimensional density field of hypersonic flow field |
| CN113238076A (en) * | 2021-05-10 | 2021-08-10 | 西北工业大学 | Complex flow field measuring method and system based on deep learning |
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2009
- 2009-03-17 CN CN200920032229U patent/CN201382849Y/en not_active Expired - Fee Related
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102122063A (en) * | 2011-03-09 | 2011-07-13 | 北京工业大学 | Inverted digital holographic microscope |
| CN102207613A (en) * | 2011-06-03 | 2011-10-05 | 北京工业大学 | Point source reference optical distortion compensation digital holography phase contrast microscope |
| CN102435415A (en) * | 2011-09-05 | 2012-05-02 | 中国人民解放军国防科学技术大学 | NPLS (Nano-tracer Plannar Laser Scattering) flow display system with enhanced signal to noise ratio and imaging method thereof |
| CN102435415B (en) * | 2011-09-05 | 2013-10-30 | 中国人民解放军国防科学技术大学 | NPLS (Nano-tracer Plannar Laser Scattering) flow display system with enhanced signal to noise ratio and imaging method thereof |
| CN105242512A (en) * | 2015-09-29 | 2016-01-13 | 南京理工大学 | Telecentric optical structure-based transmission-type digital holographic microscopic imaging device |
| CN105890671A (en) * | 2016-06-15 | 2016-08-24 | 浙江大学 | Probe for three-dimensional measurement of particle field in high temperature environment |
| CN107389207A (en) * | 2017-04-27 | 2017-11-24 | 南京航空航天大学金城学院 | A kind of Michelson's interferometer and its measuring method based on Digital Holography |
| CN107748052B (en) * | 2017-11-25 | 2018-09-21 | 南京航空航天大学 | A kind of device for measuring flap gap flowing based on PIV speed testing modes |
| CN107748052A (en) * | 2017-11-25 | 2018-03-02 | 南京航空航天大学 | A kind of device of the measurement flap gap flowing based on PIV methods |
| CN109119007A (en) * | 2018-09-17 | 2019-01-01 | 北京唐冠天朗科技开发有限公司 | A kind of product multidimensional display systems and method and application |
| CN110941024A (en) * | 2019-12-11 | 2020-03-31 | 江西莱利电气有限公司 | Device and method for detecting foreign matters in fan based on interference imaging |
| CN110941024B (en) * | 2019-12-11 | 2022-05-17 | 江西莱利电气有限公司 | Device and method for detecting foreign matters in fan based on interference imaging |
| CN112098039A (en) * | 2020-09-08 | 2020-12-18 | 中国科学院力学研究所 | System and method for measuring pulsation density of hypersonic flow field |
| CN112098039B (en) * | 2020-09-08 | 2021-06-18 | 中国科学院力学研究所 | System and method for measuring pulsation density of hypersonic flow field |
| CN112945083A (en) * | 2021-01-29 | 2021-06-11 | 中国科学院长春光学精密机械与物理研究所 | Parallel phase shift digital holographic microscopic imaging system with optical fiber interconnection |
| CN112730875A (en) * | 2021-03-31 | 2021-04-30 | 中国空气动力研究与发展中心高速空气动力研究所 | Shutter integrated device, control system and time sequence control method |
| CN113092056A (en) * | 2021-04-25 | 2021-07-09 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Method for measuring three-dimensional density field of hypersonic flow field |
| CN113238076A (en) * | 2021-05-10 | 2021-08-10 | 西北工业大学 | Complex flow field measuring method and system based on deep learning |
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