CN201188029Y - Apparatus for measuring ultrasound suspending field of multiplication light path - Google Patents
Apparatus for measuring ultrasound suspending field of multiplication light path Download PDFInfo
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- CN201188029Y CN201188029Y CNU2007203113401U CN200720311340U CN201188029Y CN 201188029 Y CN201188029 Y CN 201188029Y CN U2007203113401 U CNU2007203113401 U CN U2007203113401U CN 200720311340 U CN200720311340 U CN 200720311340U CN 201188029 Y CN201188029 Y CN 201188029Y
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Abstract
The utility model relates to an ultrasound suspended filed measurement device for a doubled light path, which is technically characterized in that the light path emitted by a laser is internally provided with a beam splitting prism which forms a first beam and a second beam; a beam expanding device and a holophote are orderly arranged in the light path of the first beam, an ultrasonic field to be measured is arranged in the light path between the beam expanding device and the holophote, and a pellicle mirror which causes object lights to be reflected to the other side which is vertical to the direction of the first beam is arranged between the beam expanding device and the ultrasonic field to be measured; a beam expanding device which causes beams to be changed into parallel reference lights is arranged in the light path of the second beam; a convex lens which causes the object lights and reference lights to form interference lights, and an area array which records a digital hologram are arranged at the position parallel to the pellicle mirror. The measurement device uses the doubled light path, thereby probing perturbations of a sound field to cause interference fringes due to the change of the micro refractive rate generated by air to be distributed, and ensuring a measurement result to be more intuitive and accurate.
Description
Technical field
The utility model relates to a kind of ultrasound suspending field measurement device of the light path that doubles, and utilizes Digital Holography to realize the measurement of ultrasound suspending field.
Background technology
Because ultrasound suspending field is the stationary field that sound wave forms in air, can not directly receive with eyes or video-unit, add that detection process can not disturb sound field, make conventional detection instrument to use.Again because after introducing measuring element, can exert an influence and be difficult to realize measurement of full field the acoustic levitation field.So, up to the present, the research work of ultrasound suspending field is focused mostly in the numerical evaluation of acoustic levitation theory.Human traditional optical holographic method such as the Zhang Lin of Northwestern Polytechnical University have carried out measuring (Zhang Lin, Li Enpu, Feng Wei to the acoustic levitation field distribution first, Hong Zhenyu, Xie Wenjun, Ma Yanghua, the laser holographic interferometry research of acoustic levitation process, Acta Physica Sinica, 54 (5) (2005)).But, because the limitation of its method, measurement result is more coarse, this method with holographic dry plate as recording medium, need through complicated physics and wet-chemical treatment process, the influence that the information of record and record effect very easily are subjected to manual operation, and information processing means is limited, can not demodulate the phase information of interference field; Subsequently, people such as Zhang Lin (Zhang Lin, the laser holographic interferometry research of acoustic levitation process, master thesis, Northwestern Polytechnical University, (2005) further the burnt light paths of the two copolymerization of Applied Digital holographic method and employing are measured ultrasound suspending field, because the restriction of its light channel structure, the sensitivity of measuring the weak field of behaviour is low, and measurement range is fixing non-adjustable, measuring process is complicated, is difficult to accomplish quantitative test.
In a word, because ultrasound suspending field is low in weak field of behaviour measuring process medium sensitivity, so existing side measurement amount process is complicated, and measurement range is fixing non-adjustable.
The utility model content
The technical matters that solves
For fear of the deficiencies in the prior art part, the utility model proposes a kind of ultrasound suspending field measurement device of the light path that doubles, it is low in weak field of behaviour measuring process medium sensitivity to overcome ultrasound suspending field, and measurement range is fixing non-adjustable, and measuring process is than complicated problems.
Technical scheme
Technical characterictic of the present utility model is: device comprises laser instrument 12,6, two parallel beam expand devices of beam splitter 5,7, semi-transparent semi-reflecting lens 4, completely reflecting mirror 3, convex lens 2 and area array CCD 1; The completely reflecting mirror 10 of attenuator 11 and change optical path direction is set in the light path that laser instrument 12 sends, the beam splitter 6 that forms first light beam and second light beam is set afterwards; In the light path of first light beam, set gradually parallel beam expand device 5 and completely reflecting mirror 3, ultrasonic field to be measured is arranged in light path between parallel beam expand device 5 and the completely reflecting mirror 3, between parallel beam expand device 5 and ultrasonic field to be measured a semi-transparent semi-reflecting lens 4 that thing light is reflexed to an other side vertical with first beam direction is set; In the light path of second light beam, be provided with one light beam become the parallel beam expand device 7 of parallel reference light, after parallel beam expand device 7, set gradually the completely reflecting mirror 8 and the semi-transparent semi-reflecting lens 9 that change optical path direction; Semi-transparent semi-reflecting lens 9 interferes in the light path of back formation at two-beam between semi-transparent semi-reflecting lens 4 and convex lens 2, sets gradually the convex lens 2 of interference pattern imaging and the area array CCD 1 of record digital hologram.
Described beam splitter 6 is fixing splitting ratio beam splitter, or the adjustable beam splitter of splitting ratio.
Described parallel beam expand device 5,7 is a beam expanding lens, or lens combination.
Described line array CCD 1 is the charge-coupled image sensor of one side array distribution.
Beneficial effect
Superiority compared to existing technology is: (1) is not owing to there is disturbance flow field such as instrument probe in the process of utilizing this measurement mechanism that ultrasonic field is measured, light beam does not cause interference to it after by ultrasound suspending field to be measured, thereby avoids producing therefrom error; (2) owing to the noninertia of light, this measurement mechanism can be used to study the transient process of ultrasonic field, realizes its instantaneous record; (3) this measurement mechanism utilization multiplication light path distributes thereby can survey the interference fringe that small variations in refractive index that the sound field disturbance produces air causes, and makes measurement result directly perceived more, accurately.
Description of drawings
Fig. 1: the structural representation of measurement mechanism embodiment
The 1-area array CCD; The 2-convex lens; The 3-completely reflecting mirror; The 4-semi-transparent semi-reflecting lens; 5-beam-expanding collimation device; The 6-beam splitter; 7-beam-expanding collimation device; The 8-completely reflecting mirror; The 9-semi-transparent semi-reflecting lens; The 10-completely reflecting mirror; The 11-attenuator; The 12-gas laser; The 13-computing machine
Embodiment
Now in conjunction with the accompanying drawings the utility model is further described:
Embodiment is as shown in the figure: measurement mechanism comprises gas laser 12, attenuator 11, completely reflecting mirror 10, beam splitter 6, beam-expanding collimation device 5, semi-transparent semi-reflecting lens 4, completely reflecting mirror 3, beam-expanding collimation device 7, completely reflecting mirror 8, semi-transparent semi-reflecting lens 9, convex lens 2 and area array CCD 1, and is contained in ultrasonic field A to be measured wherein.
The second bundle light by completely reflecting mirror 8 and semi-transparent semi-reflecting lens 9 reflections, is adjusted angle and is formed interference region successively after being expanded bundle and be collimated into directional light by the second beam-expanding collimation device 7, and planoconvex lens 2 is imaged on the CCD1.
The groundwork process is sent light beam through behind the described attenuator 11 by: gas laser 12, is reflexed to beam splitter 6 by completely reflecting mirror 10.Beam splitter 6 is divided into first light beam and second light beam with this light beam.First light beam expands bundle and the collimation back becomes directional light through beam-expanding collimation device 5, is returned along former road by completely reflecting mirror 3 after passing ultrasound suspending field A again, again by semi-transparent semi-reflecting lens 4 reflections, is imaged on the area array CCD 1 by convex lens 2 after seeing through semi-transparent semi-reflecting lens 9.Simultaneously, after the second bundle light is expanded bundle and is collimated into directional light by beam-expanding collimation device 7, by completely reflecting mirror 8 and semi-transparent semi-reflecting lens 9 reflections, form interference region successively, planoconvex lens 2 also is imaged on the CCD1.
Because CCD1 is between one times of focal length of convex lens 2 and two times of focal lengths.Regulate the distance between convex lens 2 and CCD1 and the ultrasound suspending field A three to be measured, make ultrasound suspending field A process convex lens 2 back blur-free imagings to be measured on CCD1.In the CCD1 recording interval, regulate first and second angle of beams, make the document image frequency spectrum to separate, take respectively then and do not add ultrasound suspending field and the digital hologram interferogram that adds under two kinds of situations of ultrasound suspending field, at last, the digital hologram of two kinds of situations is carried out numerical value reconstruct by computing machine 13 by means such as fast fourier transform algorithm and Digital Image Processing, and the digital hologram that promptly can obtain the acoustic levitation field reproduces picture.
Claims (3)
1. the ultrasound suspending field measurement device of the light path that doubles, it is characterized in that: device comprises laser instrument (12), beam splitter (6), two parallel beam expand devices (5), (7), semi-transparent semi-reflecting lens (4), completely reflecting mirror (3), convex lens (2) and area array CCD (1); The completely reflecting mirror (10) of attenuator (11) and change optical path direction is set in the light path that laser instrument (12) sends, the beam splitter (6) that forms first light beam and second light beam is set afterwards; In the light path of first light beam, set gradually parallel beam expand device (5) and completely reflecting mirror (3), ultrasonic field to be measured is arranged in light path and is arranged between parallel beam expand device (5) and the completely reflecting mirror (3), between parallel beam expand device (5) and ultrasonic field to be measured a semi-transparent semi-reflecting lens (4) that thing light is reflexed to an other side vertical with first beam direction is set; In the light path of second light beam, be provided with one light beam become the parallel beam expand device (7) of parallel reference light, set gradually completely reflecting mirror (8) and the semi-transparent semi-reflecting lens (9) that changes optical path direction afterwards at parallel beam expand device (7); Semi-transparent semi-reflecting lens (9) is positioned between semi-transparent semi-reflecting lens (4) and the convex lens (2), interferes in the light path of back formation at two-beam, sets gradually the convex lens 2 of interference pattern imaging and the area array CCD (1) of record digital hologram.
2. the ultrasound suspending field measurement device of multiplication light path according to claim 1 is characterized in that: described beam splitter (6) is fixing splitting ratio beam splitter, or the adjustable beam splitter of splitting ratio.
3. the ultrasound suspending field measurement device of multiplication light path according to claim 1 is characterized in that: described parallel beam expand device (7) is a beam expanding lens, or lens combination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007203113401U CN201188029Y (en) | 2007-12-21 | 2007-12-21 | Apparatus for measuring ultrasound suspending field of multiplication light path |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007203113401U CN201188029Y (en) | 2007-12-21 | 2007-12-21 | Apparatus for measuring ultrasound suspending field of multiplication light path |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201188029Y true CN201188029Y (en) | 2009-01-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007203113401U Expired - Fee Related CN201188029Y (en) | 2007-12-21 | 2007-12-21 | Apparatus for measuring ultrasound suspending field of multiplication light path |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201188029Y (en) |
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2007
- 2007-12-21 CN CNU2007203113401U patent/CN201188029Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090128 Termination date: 20111221 |