CN105158162A - Optical cross-correlation-based time gating device and method - Google Patents
Optical cross-correlation-based time gating device and method Download PDFInfo
- Publication number
- CN105158162A CN105158162A CN201510226472.3A CN201510226472A CN105158162A CN 105158162 A CN105158162 A CN 105158162A CN 201510226472 A CN201510226472 A CN 201510226472A CN 105158162 A CN105158162 A CN 105158162A
- Authority
- CN
- China
- Prior art keywords
- lens
- light
- spray field
- optical
- incident
- 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.)
- Pending
Links
Abstract
The invention discloses an optical cross-correlation-based time gating device and method and relates to a spray field atomization measurement device and method. The optical cross-correlation-based time gating device and method realize time gating in spray field measurement. The method comprises that ultrashort laser pulse is divided into two light paths by a beam splitting piece, one of the light paths goes through a delay line and then is focused to an optical nonlinear crystal, the other one of the light paths is chopped and then is injected into a spray field, incidence angles of the light paths into the optical nonlinear crystal are adjusted so that the light path phase matching conditions are satisfied in space, and when the delay line is adjusted so that the two optical pulses arrive at the optical nonlinear crystal simultaneously, because of nonlinear optical effects, a second harmonic signal is emitted along a spatial specific direction, wherein the second harmonic signal shows related information of the two light paths. Fundamental light is removed by a filter plate, a second harmonic signal is recorded and spray field emitting photonic information is derived inversely. The device and method realize time gating of ballistic photons, serpentine photons and scattered photons emitted from a spray field.
Description
Technical field
The present invention relates to measurement mechanism and the method for spray field atomization process.
Background technology
Due to engine atomization process be in enclosed cylinder quick, interval dynamic process.Be subject to the impact of in-cylinder pressure, temperature, air-flow, whole spray atomization process is divided into first atomization, secondary-atomizing and further divides atomization.Modern Engine expulsion pressure significantly improves, the quite short <4ms of injecting time, and injected fuel spray speed is greater than cylinder environment velocity of sound, and the phenomenons such as consequent shock wave make injected fuel spray atomization process more complicated.This makes common measuring technology all cannot measure exactly fuel atomizing situation.
Fig. 1 and Fig. 2 represents the situation of a laser pulse after scattering medium.As we can see from the figure, incident laser pulse is broken down into three parts in time, corresponds respectively to the three kind different circulation ways of incident laser in scattering medium.One spatially directly penetrates medium along incident light direction, the time is also penetrate scattering medium at first, is called trajectory photon (ballisticphotons).Trajectory photon is with the abundantest information of media interior structure, and such as its Strength Changes reflects the integrating effect that optical propagation direction absorbs, and its phase place change reflects its light path experienced in scattering medium; Another scattering direction roughly with incident light in the same way, be called as the photon that crawls (snakephotons), it will be a little later through the time of scattering medium, certain time-delay is had relative to trajectory photon, but also carry about the information of scattering medium compared with horn of plenty, reflect some scattering propertiess along the scattering medium in light incident direction; Finally through the part laser pulse of scattering medium, also be the laser pulse of largest portion simultaneously, have passed through the Multiple Scattering in scattering medium, its scattering angle is larger, the distance of process is also long, therefore with scattering medium integrally, macroscopic view scattering properties, be called as scattered photon (diffusephotons).Will to the imaging of scattering medium interior details, trajectory photon is optimum selection.But generally speaking, due to more toward scattering medium depths, single scattering odds is less, so this photon is just more weak, and its degree of depth that can detect is limited.Improve the imaging efficiency of the method, other photon all will be removed.The most feasible method introduces optical shutter exactly in time domain, makes to only have trajectory photon and snakelike photon to pass through, and scattered photon is blocked.The key of this fast gate technique utilizes reference light pulse to realize temporal stringent synchronization, and then the Push And Release of control both optical shutter, namely so-called time gated.
Summary of the invention
The present invention is time gated in order to what realize in spray field measuring process, thus provides a kind of time gated device and method measured for spray field.
Based on a time gated device for optics cross-correlation, it comprises beam splitting chip 2, chopper 3, No. seven lens 7, lens 8, optical delay components 13, No. two lens 16, optical filter 10, No. six lens 11, detector 12, lock-in amplifier 17 and computing machines 19;
Ultrashort laser pulse is divided into first via light and the second road light through beam splitting chip 2, and described first via light is incident to No. two lens 16 after optical delay components 13 postpones, and focuses to nonlinear crystal 9 through No. two lens 16;
Described second road light is incident to No. seven lens 7 after chopper 3 copped wave, spray field 20 is focused to through No. seven lens 7, laser through spray field 20 outgoing is incident to lens 8, focuses to nonlinear crystal 9 through described lens 8, and identical with No. two lens 16 focal positions;
After filter plate 10 is positioned at nonlinear crystal 9, for carrying out filtering to the laser transmitted; After No. six lens 11 are positioned at filter plate 10, for filtered for filter plate 10 light is focused to detector 12;
Detector 12 is for detecting the light intensity of the laser received, and the electrical signal of described detector 12 is connected with the light intensity signal input end of lock-in amplifier 17; Described lock-in amplifier 17 carries out data interaction with computing machine; The control signal input end of chopper 3 is connected with the control signal output terminal of lock-in amplifier 17.
Based on a kind of time gated method based on optics cross-correlation of said apparatus, the method is specially:
Ultrashort laser pulse is divided into two-way through optical beam splitting sheet 2, and wherein a road focuses to nonlinear optical crystal 9 after lag line;
Another road is first incident to spray field 20 after copped wave, is also focused to the same position of nonlinear optical crystal 9 by the pulse of spray field 20 outgoing;
Regulate the incident angle being incident to this two-way light on nonlinear optical crystal 9, two-way light is made spatially to meet phase-matching condition, when control lag line makes two-way light pulse arrive nonlinear optical crystal simultaneously, due to the existence of nonlinear optical effect, meeting outgoing second harmonic signal on the specific direction of space, this second harmonic signal reflects the relevant information of two-way light; By recording this second harmonic signal after filter plate filtering fundamental frequency light, and the anti-photon information releasing spray field outgoing.
The present invention is in proving installation, and the impact utilizing optics cross-correlation technique to produce spray field test to eliminate spray field the scattering of test light, utilizes this effect to realize time gated to the trajectory photon of spray field outgoing, snakelike photon and scattered photon etc.
Accompanying drawing explanation
Fig. 1 be in background technology scattering medium to the effect schematic diagram of laser pulse;
Fig. 2 is by the laser pulse temporal distribution schematic diagram after scattering medium in background technology;
Fig. 3 is the structural representation of apparatus of the present invention;
Embodiment
Embodiment one, composition graphs 1 illustrate this embodiment, based on a time gated device for optics cross-correlation, it is characterized in that: it comprises beam splitting chip 2, chopper 3, No. seven lens 7, lens 8, optical delay components 13, No. two lens 16, optical filter 10, No. six lens 11, detector 12, lock-in amplifier 17 and computing machines 19;
Ultrashort laser pulse is divided into first via light and the second road light through beam splitting chip 2, and described first via light is incident to No. two lens 16 after optical delay components 13 postpones, and focuses to nonlinear crystal 9 through No. two lens 16;
Described second road light is incident to No. seven lens 7 after chopper 3 copped wave, spray field 20 is focused to through No. seven lens 7, laser through spray field 20 outgoing is incident to lens 8, focuses to nonlinear crystal 9 through described lens 8, and identical with No. two lens 16 focal positions;
After filter plate 10 is positioned at nonlinear crystal 9, for carrying out filtering to the laser transmitted; After No. six lens 11 are positioned at filter plate 10, for filtered for filter plate 10 light is focused to detector 12;
Detector 12 is for detecting the light intensity of the laser received, and the electrical signal of described detector 12 is connected with the light intensity signal input end of lock-in amplifier 17; Described lock-in amplifier 17 carries out data interaction with computing machine; The control signal input end of chopper 3 is connected with the control signal output terminal of lock-in amplifier 17.
The difference of a kind of time gated device based on optics cross-correlation described in embodiment two, this embodiment and embodiment one is, it also comprises motorized precision translation stage 18, the control signal input end of described motorized precision translation stage 18 is connected with the control signal output terminal of computing machine 19, and described motorized precision translation stage 18 is for adjusting optical delay components 13.
The difference of a kind of time gated device based on optics cross-correlation described in embodiment three, this embodiment and embodiment one or two is, it also comprises a catoptron 4, No. two catoptrons 5 and No. three catoptrons 6, and the described detection light separated through beam splitting chip 2 is incident to spray field 20 first after a catoptron 4, No. two catoptrons 5 and No. three catoptrons 6 reflect.
The difference of a kind of time gated device based on optics cross-correlation described in embodiment four, this embodiment and embodiment three is, it also comprises No. four catoptrons 14 and No. five catoptrons 15, described pump light after optical delay components 13 postpones first after after No. four catoptrons 14 and No. five catoptrons 15 reflect incident No. two lens 16.
The difference of a kind of time gated device based on optics cross-correlation described in embodiment five, this embodiment and embodiment one, two or four is, it comprises laser instrument 1, described laser instrument 1 for generation of ultrashort laser pulse, and is emitted to beam splitting chip 2.
Embodiment six, based on a kind of time gated method based on optics cross-correlation described in embodiment one, the method is specially:
Ultrashort laser pulse is divided into two-way through optical beam splitting sheet 2, and wherein a road focuses to nonlinear optical crystal 9 after lag line;
Another road is first incident to spray field 20 after copped wave, is also focused to the same position of nonlinear optical crystal 9 by the pulse of spray field 20 outgoing;
Regulate the incident angle being incident to this two-way light on nonlinear optical crystal 9, two-way light is made spatially to meet phase-matching condition, when control lag line makes two-way light pulse arrive nonlinear optical crystal simultaneously, due to the existence of nonlinear optical effect, meeting outgoing second harmonic signal on the specific direction of space, this second harmonic signal reflects the relevant information of two-way light; By recording this second harmonic signal after filter plate filtering fundamental frequency light, and the anti-photon information releasing spray field outgoing.
Because the nonlinear optical crystal response time is extremely short, usually in tens femtosecond magnitudes.Therefore this technology can be utilized to realize time gated to the trajectory photon of spray field outgoing, snakelike photon and scattered photon etc.
Claims (8)
1. based on a time gated device for optics cross-correlation, it is characterized in that: it comprises beam splitting chip (2), chopper (3), No. seven lens (7), lens (8), optical delay components (13), No. two lens (16), optical filter (10), No. six lens (11), detector (12), lock-in amplifier (17) and computing machines (19);
Ultrashort laser pulse is divided into first via light and the second road light through beam splitting chip (2), described first via light is incident to No. two lens (16) after optical delay components (13) postpones, and focuses to nonlinear crystal (9) through No. two lens (16);
Described second road light is incident to No. seven lens (7) after chopper (3) copped wave, spray field (20) is focused to through No. seven lens (7), laser through spray field (20) outgoing is incident to a lens (8), nonlinear crystal (9) is focused to through a described lens (8), and identical with No. two lens (16) focal positions;
After filter plate (10) is positioned at nonlinear crystal (9), for carrying out filtering to the laser transmitted; After No. six lens (11) are positioned at filter plate (10), for filter plate (10) filtered light is focused to detector (12);
Detector (12) is for detecting the light intensity of the laser received, and the electrical signal of described detector (12) is connected with the light intensity signal input end of lock-in amplifier (17); Described lock-in amplifier (17) and computing machine carry out data interaction; The control signal input end of chopper (3) is connected with the control signal output terminal of lock-in amplifier (17).
2. a kind of time gated device based on optics cross-correlation according to claim 1, it is characterized in that it also comprises motorized precision translation stage (18), the control signal input end of described motorized precision translation stage (18) is connected with the control signal output terminal of computing machine (19), and described motorized precision translation stage (18) is for adjusting optical delay components (13).
3. a kind of time gated device based on optics cross-correlation according to claim 1 and 2, it is characterized in that it also comprises a catoptron (4), No. two catoptrons (5) and No. three catoptrons (6), the described detection light separated through beam splitting chip (2) is incident to No. seven lens (7) first after a catoptron (4), No. two catoptrons (5) and No. three catoptron (6) reflections.
4. a kind of time gated device based on optics cross-correlation according to claim 3, it is characterized in that it also comprises No. four catoptrons (14) and No. five catoptrons (15), described pump light after optical delay components (13) postpones first after after No. four catoptrons (14) and No. five catoptrons (15) reflections incidence No. two lens (16).
5. a kind of time gated device based on optics cross-correlation according to claim 1,2 or 4, it is characterized in that it comprises laser instrument (1), described laser instrument (1) for generation of ultrashort laser pulse, and is emitted to beam splitting chip (2).
6., based on a kind of time gated method based on optics cross-correlation of claim 1, it is characterized in that: the method is specially:
Ultrashort laser pulse is divided into two-way through optical beam splitting sheet (2), and wherein a road focuses to nonlinear optical crystal (9) after lag line;
Another road is first incident to spray field (20) after copped wave, is also focused to the same position of nonlinear optical crystal (9) by the pulse of spray field (20) outgoing;
Adjustment is incident to the incident angle of nonlinear optical crystal (9) this two-way light upper, two-way light is made spatially to meet phase-matching condition, when control lag line makes two-way light pulse arrive nonlinear optical crystal simultaneously, due to the existence of nonlinear optical effect, meeting outgoing second harmonic signal on the specific direction of space, this second harmonic signal reflects the relevant information of two-way light; By recording this second harmonic signal after filter plate filtering fundamental frequency light, and the anti-photon information releasing spray field outgoing.
7. a kind of time gated method measured for spray field according to claim 6, is characterized in that the response time of nonlinear optical crystal (9) is tens femtosecond magnitudes.
8. a kind of time gated method measured for spray field according to claim 6, is characterized in that the time gated trajectory photon towards spray field outgoing, snakelike photon and scattered photon that spray field is measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510226472.3A CN105158162A (en) | 2015-05-06 | 2015-05-06 | Optical cross-correlation-based time gating device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510226472.3A CN105158162A (en) | 2015-05-06 | 2015-05-06 | Optical cross-correlation-based time gating device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105158162A true CN105158162A (en) | 2015-12-16 |
Family
ID=54799097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510226472.3A Pending CN105158162A (en) | 2015-05-06 | 2015-05-06 | Optical cross-correlation-based time gating device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105158162A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108593604A (en) * | 2018-05-30 | 2018-09-28 | 中国工程物理研究院激光聚变研究中心 | Non-linear nature tests system and non-linear nature test method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006051766A1 (en) * | 2004-11-15 | 2006-05-18 | National University Corporation Hokkaido University | Optical measurement evaluating method and optical measurement evaluating device |
| US20060263777A1 (en) * | 2003-01-27 | 2006-11-23 | Tong William G | Sensitive sensing based on optical optical nonlinear wave mixing |
| CN101595379A (en) * | 2006-11-29 | 2009-12-02 | 独立行政法人科学技术振兴机构 | Pumping probe measurement device and the scanning probe microscopy device that uses it |
| CN103018930A (en) * | 2012-11-25 | 2013-04-03 | 华中科技大学 | High-speed shutter device and application thereof |
-
2015
- 2015-05-06 CN CN201510226472.3A patent/CN105158162A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060263777A1 (en) * | 2003-01-27 | 2006-11-23 | Tong William G | Sensitive sensing based on optical optical nonlinear wave mixing |
| WO2006051766A1 (en) * | 2004-11-15 | 2006-05-18 | National University Corporation Hokkaido University | Optical measurement evaluating method and optical measurement evaluating device |
| CN101595379A (en) * | 2006-11-29 | 2009-12-02 | 独立行政法人科学技术振兴机构 | Pumping probe measurement device and the scanning probe microscopy device that uses it |
| CN103018930A (en) * | 2012-11-25 | 2013-04-03 | 华中科技大学 | High-speed shutter device and application thereof |
Non-Patent Citations (2)
| Title |
|---|
| FLORIAN MATHIEUET AL.: "Time-gated ballistic imaging using a large aperture switching beam", 《OPTICS EXPRESS》 * |
| 董志伟: "金属复合纳米材料宽带半导体材料的超快光物理研究", 《中国博士学位论文全文数据库 基础科学辑（月刊）》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108593604A (en) * | 2018-05-30 | 2018-09-28 | 中国工程物理研究院激光聚变研究中心 | Non-linear nature tests system and non-linear nature test method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106645033B (en) | The ultrafast diagnostic device of optical element laser damage integration | |
| CN104596645B (en) | Completely-polarized multi-angle scattering simulation and testing system for complex environment | |
| CN102169050A (en) | Method for comprehensively measuring reflectivity | |
| CN108469426B (en) | Coaxial included-angle-free pumping detection method and system | |
| CN103175629B (en) | Method for fast measuring sea water temperature | |
| CN107884079B (en) | Single-shot ultrashort laser pulse width measuring device and measuring method | |
| CN201935737U (en) | Laser pulse waveform measuring device | |
| KR20220025811A (en) | Sensor arrangement for characterizing particles | |
| CN104142316A (en) | Pre-ablation and reheating combined triple-pulse LIBS (laser-induced breakdown spectroscopy) detection system | |
| CN103926200B (en) | A kind of temperature measuring equipment of CARS and TDLAS conllinear | |
| CN103471998A (en) | Ultrasonic material reflection and transmission coefficient laser measurement system | |
| CN108593106A (en) | A kind of system and device of detection stimulated Brillouin scattering transient state ultrasonic grating spectrum | |
| CN207487831U (en) | Single ultrashort laser pulse width of measuring device | |
| KR101003023B1 (en) | Nanoparticle sizing method using the frequency distribution curve of probe beam deflection signal magnitude generated by laser-induced breakdown | |
| CN103712771B (en) | A kind of engine spray flow field near field region optical diagnostic system | |
| CN102645408A (en) | Phase object Z-scan-based pump-probe method | |
| CN105403534A (en) | Method for measuring transient state optical nonlinearity of material | |
| CN105675153B (en) | The radially measuring device and measurement method of group delay before heavy caliber ultrashort laser pulse | |
| US7817270B2 (en) | Nanosecond flash photolysis system | |
| CN104483105A (en) | Interpixel crosstalk detection system and method | |
| CN104897530B (en) | A kind of spray atomization measurement of full field device and method based on photon temporal filtering technique | |
| CN105158162A (en) | Optical cross-correlation-based time gating device and method | |
| CN111142121B (en) | Brillouin scattering temperature measurement laser radar system based on two-stage virtual image phase array | |
| CN109443698B (en) | System device for directly imaging stimulated Brillouin scattering transient grating structure | |
| CN106454334A (en) | Device for measuring exposure time of X-ray framing camera |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20151216 |