CN105785071A - High-sensitivity light trap measuring device and measuring method thereof - Google Patents
High-sensitivity light trap measuring device and measuring method thereof Download PDFInfo
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- CN105785071A CN105785071A CN201610124770.6A CN201610124770A CN105785071A CN 105785071 A CN105785071 A CN 105785071A CN 201610124770 A CN201610124770 A CN 201610124770A CN 105785071 A CN105785071 A CN 105785071A
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- ligh trap
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/04—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving
- G01B11/043—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving for measuring length
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- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses a high-sensitivity light trap measuring device and a measuring method thereof. The high-sensitivity light trap measuring device comprises a sample cell module, an initial capturing light trap module, a suspension measurement light trap module and a position detecting module. Firstly, particles are captured at a light trap balance point by means of initial capturing light and are quickly stabilized. Then suspension measuring light is started and simultaneously the initial capturing light is eliminated so that the particles are stabilized at the light trap balance point which is formed by the suspension measuring light. Then high-sensitivity measurement on a displacement signal and an acceleration signal is performed. According to the measuring method, on the condition of low damping in air or vacuum, capturing efficiency can be effectively improved and furthermore the particles are quickly stabilized, thereby preventing a defect of measurement application deterioration caused by long-time oscillation after capturing the particles by a low-rigidity light trap. The high-sensitivity light trap measuring device and the measuring method thereof have advantages of eliminating defects in a common light trap measuring device, realizing high-efficiency capture and quick stabilization of the particles, and furthermore obtaining high measurement sensitivity on the displacement signal and the acceleration signal.
Description
Technical field
The present invention relates to the ligh trap measurement apparatus being applied to optical engineering field, carry out ligh trap measurement apparatus and the measuring method thereof of accurate measurement especially with optical levitation.
Background technology
According to quantum theory, light beam is that a group has again the photon of momentum with light velocity motion, existing quality.Occur refraction and reflection, the speed of photon and direction to change when photon incides dielectric surface, cause the change of its momentum vector.Just can being released by the law of conservation of momentum, when light beam incidence microgranule, the momentum change amount of photon is exactly the momentum change amount of microgranule.So microgranule is existed the effect of power by light beam, it is called light radiation pressure.Light radiation pressure includes along the scattering force of direction of beam propagation and always points at the light intensity gradient force compared with strength.Under the effect of the two power, microgranule can be caught by light beam in certain area, even it is stable at certain ad-hoc location, this region is called ligh trap.
Rigidity definition physically refers to the ability of object opposing deformation, and the rigidity (i.e. ligh trap linear coefficient) of ligh trap measurement apparatus can be understood as in a certain position of ligh trap, the constraint ability to microgranule.Rigidity is more big, and the constraint ability of microgranule is more big；Rigidity is more little, and the constraint ability of microgranule is more little.It is to say, to make microgranule be caught by fast and stable, it is necessary to use the ligh trap that rigidity is bigger, then particles position not easily will be produced impact by external disturbance, cause that the sensitivity of ligh trap measurement apparatus diminishes；To improve the sensitivity of device, then needing to reduce Optical Trap Stiffness, this is unfavorable for again catching and fast and stable of microgranule.
Ligh trap measurement apparatus is usable in a lot of field, as light trap acceleration meter (Chen Jing, Hu Huizhu, Bai Jian, Shu Xiaowu, Liu Cheng. utilize dual-beam suspension ligh trap measure acceleration device, CN101320049A).
Generally, the sensitivity of acceleration analysis refers to the minimum acceleration value that can measure.Under the premise being left out hardware device restriction, the sensitivity of system is finally determined by the change in displacement size of microgranule under same acceleration.As long as assuming the change that acceleration can be made in displacement by microgranule, position sensor just can detect corresponding amount.
Common ligh trap measurement apparatus, to realize the fast and stable of microgranule is caught, then needs the ligh trap using rigidity bigger, so necessarily causes that the change in displacement of microgranule recorded under same acceleration is little, causes its sensitivity decrease；If wanting to improve sensitivity, it is necessary to improve and reduce Optical Trap Stiffness, then the capture rate to microgranule will be reduced, increase the time that microsphere is stably caught.
Summary of the invention
It is an object of the invention to the deficiency for existing ligh trap measurement apparatus, it is proposed that a kind of high sensitivity ligh trap measurement apparatus and measuring method thereof, can efficient capture and fast and stable microgranule, again displacement, acceleration signal are had high measurement sensitivity.
A kind of high sensitivity ligh trap measurement apparatus, including four modules: sample cell module, initial acquisition ligh trap module, floating measurement ligh trap module, position sensing module；
Sample cell module is provided with sample cell and microgranule；
Initial acquisition ligh trap module is used for stably catching at ligh trap equilibrium point place first by microgranule, beam of laser form strong gradient force ligh trap module after collimator and extender and focusing so that the microgranule in sample cell is captured and stable；
Floating measurement ligh trap module is used for while removing the light path of initial acquisition ligh trap module, the ligh trap that suspension light is formed is utilized again stably to be caught by microgranule at ligh trap equilibrium point place, it is entered, by the Gaussian beam of another bundle light path altogether, the Low rigidity ligh trap module that sample cell is formed, for the high-sensitivity measurement to displacement, acceleration signal；
Position sensing module is used for the displacement signal observing the capture effect of microgranule and detection microgranule.
Described initial acquisition ligh trap module includes laser instrument, isolator, collimating lens L1, mirror M 1, mirror M 2, lens L2, lens L3, mirror M 3, object lens OBJ, dichroic mirror D；Laser instrument sends laser, i.e. initial acquisition light beam, and collimated lens L1 collimates, and after being reflected mirror M1, mirror M 2, expands through lens L2, lens L3, is reflected mirror M3 reflection, after entering object lens OBJ, by dichroic mirror D efficient capture microgranule in sample cell.
Described floating measurement ligh trap module includes laser instrument, dichroic mirror D；Laser instrument sends Gauss light, forms ligh trap by dichroic mirror D, and stably catch microgranule in sample cell, is formed and displacement, acceleration signal are had highly sensitive single beam floating measurement ligh trap.
Being provided with closed chamber in described sample cell, closed chamber adopts thin slice punching or grooving technique, can be liquid, air or vacuum in sample cell, finally seals to intercept flow perturbation introducing error with coverslip.
Described position sensing module includes imaging len L4, CCD successively.
Described microgranule is the size optical-quality homogeneous transparent particle in um to mm magnitude, meets captured light in respective environment and stably catches, and material is polystyrene or silicon dioxide.
Described sample cell is optical-quality homogeneous medium, and the laser that laser instrument sends can be uniformly through.
Device described in a kind of basis carries out the method for high sensitivity ligh trap measurement, first with initial acquisition ligh trap module, microgranule is stably caught at ligh trap equilibrium point place, open floating measurement ligh trap light path again, remove initial acquisition ligh trap light path simultaneously, utilize the ligh trap that suspension light is formed again stably to be caught by microgranule at ligh trap equilibrium point place, observe the capture effect of microgranule and the displacement signal of detection microgranule by position sensing module.
Beneficial effects of the present invention, has general ligh trap measurement apparatus and does not have the advantage that:
Take into account capture rate and measure sensitivity, it is proposed that a kind of high sensitivity ligh trap measurement apparatus and measuring method thereof, capture rate can be improved and shorten the stabilization time after catching, again displacement, acceleration signal being had high measurement sensitivity.
Accompanying drawing explanation
Fig. 1 is a structural representation of high sensitivity ligh trap measurement apparatus of the present invention；
Fig. 2 is the index path that high sensitivity ligh trap measurement apparatus of the present invention realizes.
Detailed description of the invention
With reference to Fig. 1, a kind of high sensitivity ligh trap measurement apparatus, including four modules: sample cell module, initial acquisition ligh trap module, floating measurement ligh trap module, position sensing module；
Sample cell module is provided with sample cell and microgranule, by beam path alignment, makes the ligh trap equilibrium point that initial acquisition light and suspension light are formed overlap.First with initial acquisition ligh trap module, microgranule is stably caught at ligh trap equilibrium point place, open floating measurement ligh trap light path again, remove initial acquisition ligh trap light path simultaneously, utilize the ligh trap that suspension light is formed again stably to catch microgranule, observe the capture effect of microgranule and the displacement signal of detection microgranule by position sensing module.
With reference to Fig. 2, described initial acquisition ligh trap module includes laser instrument, isolator, collimating lens L1, mirror M 1, mirror M 2, lens L2, lens L3, mirror M 3, object lens OBJ, dichroic mirror D；Laser instrument sends laser, i.e. initial acquisition light beam, collimated lens L1 collimates, and after being reflected mirror M1, mirror M 2, expands through lens L2, lens L3, it is reflected mirror M3 reflection, after entering object lens OBJ, being entered in sample cell by dichroic mirror D, the rigidity of initial acquisition light now is bigger, the constraint effect of microgranule is strong, and microgranule displacement to external world, acceleration signal are insensitive.
Described floating measurement ligh trap module includes laser instrument, dichroic mirror D；Laser instrument sends Gauss light, is entered in sample cell by dichroic mirror D, and now the rigidity of the Gauss light of non-line focus is less, and the constraint effect of microgranule is more weak, and microgranule displacement to external world, acceleration signal can make fast reaction.
Before measurements, carry out light path alignment, observe the initial acquisition light in ccd image and the hot spot of suspension light formation respectively, make them overlap, so that the ligh trap equilibrium point that initial acquisition light and suspension light are formed overlaps.
Described sample cell module includes sample cell and microgranule, is provided with closed chamber in sample cell, and closed chamber adopts thin slice punching or grooving technique, can be liquid, air or vacuum in sample cell, finally seals to intercept flow perturbation introducing error with coverslip.
Described position sensing module includes imaging len L4, CCD successively.The picture signal that the microgranule of CCD output is captured can be observed by computer.
Initial acquisition ligh trap module is utilized stably to be caught first by microgranule at ligh trap equilibrium point place during experiment, open floating measurement ligh trap light path again, remove initial acquisition ligh trap light path simultaneously, utilize the ligh trap that suspension light is formed again stably to catch microgranule, observe the capture effect of microgranule and the displacement signal (observing the picture signal that the microgranule of CCD output is captured by computer) of detection microgranule by position sensing module.
Assuming that displacement is x, linear coefficient is k, and the quality of microgranule is m, is linear due to trapping stiffness within the specific limits, and system acceleration can be expressed as:
Owing to accelerometer is output as the displacement of microgranule, it can be deduced that the sensitivity of accelerometer is that the least displacement that be can be detected by by system determines.Being can be seen that by above formula, the displacement of microgranule is inversely proportional to the linear coefficient k in the ligh trap range of linearity, and in other words, under same acceleration, ligh trap linear coefficient more little (namely the rigidity of ligh trap is more little), particle displacement is more big, and the sensitivity of accelerometer is more high；Ligh trap linear coefficient more big (namely the rigidity of ligh trap is more big), particle displacement is more little, and the sensitivity of accelerometer is more low.
In sum, owing to the rigidity of initial acquisition light is relatively big, the rigidity of suspension light is less, so can realize microgranule fast and stable and catch, and based on LFA principle, has again higher measurement sensitivity.And when the low resistance such as air or vacuum, this device is improving while capture rate, it is possible to make particles position fast and stable, it is to avoid Low rigidity ligh trap catches the phenomenon that rear particles position vibrates for a long time, is of value to measurement application.
Described microgranule is the size optical-quality homogeneous transparent particle in um to mm magnitude, meets captured light in respective environment and stably catches, and material is polystyrene or silicon dioxide.
Described sample cell is optical-quality homogeneous medium, and the laser that laser instrument sends can be uniformly through.
It should be noted last that, above example is only in order to illustrate technical scheme and unrestricted.Although the present invention being described in detail with reference to embodiment, it will be understood by those within the art that, technical scheme being modified or equivalent replacement, without departure from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of scope of the presently claimed invention.
Claims (8)
1. a high sensitivity ligh trap measurement apparatus, is characterized in that, including four modules: sample cell module, initial acquisition ligh trap module, floating measurement ligh trap module, position sensing module；
Sample cell module is provided with sample cell and microgranule；
Initial acquisition ligh trap module is used for stably catching at ligh trap equilibrium point place first by microgranule, beam of laser form strong gradient force ligh trap module after collimator and extender and focusing so that the microgranule in sample cell is captured and stable；
Floating measurement ligh trap module is used for while removing the light path of initial acquisition ligh trap module, the ligh trap that suspension light is formed is utilized again stably to be caught by microgranule at ligh trap equilibrium point place, it is entered, by the Gaussian beam of another bundle light path altogether, the Low rigidity ligh trap module that sample cell is formed, for the high-sensitivity measurement to displacement, acceleration signal；
Position sensing module is used for the displacement signal observing the capture effect of microgranule and detection microgranule.
2. device according to claim 1, is characterized in that, described initial acquisition ligh trap module includes laser instrument, isolator, collimating lens L1, mirror M 1, mirror M 2, lens L2, lens L3, mirror M 3, object lens OBJ, dichroic mirror D；
Laser instrument sends laser, i.e. initial acquisition light beam, and collimated lens L1 collimates, and after being reflected mirror M1, mirror M 2, expands through lens L2, lens L3, is reflected mirror M3 reflection, after entering object lens OBJ, by dichroic mirror D at sample cell IT microgranule.
3. device according to claim 1, is characterized in that, described floating measurement ligh trap module includes laser instrument, dichroic mirror D；
Laser instrument sends Gauss light, forms ligh trap by dichroic mirror D, and stably catch microgranule in sample cell, is formed and displacement, acceleration signal are had highly sensitive single beam floating measurement ligh trap.
4. device according to claim 1, is characterized in that, is provided with closed chamber in described sample cell, and closed chamber adopts thin slice punching or grooving technique, can be liquid, air or vacuum in sample cell, finally seals to intercept flow perturbation introducing error with coverslip.
5. device according to claim 1, is characterized in that, described position sensing module includes imaging len L4, CCD successively.
6. device according to claim 4, is characterized in that, described microgranule is the size optical-quality homogeneous transparent particle in um to mm magnitude, meets captured light in respective environment and stably catches, and material is polystyrene or silicon dioxide.
7. device according to claim 4, is characterized in that, described sample cell is optical-quality homogeneous medium, and the laser that laser instrument sends can be uniformly through.
8. the method that a device according to claim 1 carries out high sensitivity ligh trap measurement, it is characterized in that, first with initial acquisition ligh trap module, microgranule is stably caught at ligh trap equilibrium point place, open floating measurement ligh trap light path again, remove initial acquisition ligh trap light path simultaneously, utilize the ligh trap that suspension light is formed again stably to be caught by microgranule at ligh trap equilibrium point place, observe the capture effect of microgranule and the displacement signal of detection microgranule by position sensing module.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107607047A (en) * | 2017-09-14 | 2018-01-19 | 中国人民解放军国防科技大学 | Method for correcting misalignment of axis of image sensor in double-beam optical trap |
| CN108426633A (en) * | 2018-05-25 | 2018-08-21 | 浙江大学 | A kind of vibration measuring method and vibration detecting device based on ligh trap |
| CN111044417A (en) * | 2019-12-11 | 2020-04-21 | 之江实验室 | Device for detecting particle size by using mechanical effect of light and testing method |
| CN111983708A (en) * | 2020-08-07 | 2020-11-24 | 浙江大学 | Gravity measurement device and method based on optical trap |
| CN112255578A (en) * | 2020-12-08 | 2021-01-22 | 之江实验室 | Device and method for sensing multiple physical parameters based on optical tweezers and spin defects |
| CN114205929A (en) * | 2022-02-15 | 2022-03-18 | 之江实验室 | Infrared optical system for heating suspended nanoparticles |
| CN114509311A (en) * | 2022-04-20 | 2022-05-17 | 浙江大学 | Device for efficiently capturing aerosol by using suspended optical tweezers and application method thereof |
| CN114720722A (en) * | 2022-04-06 | 2022-07-08 | 中国人民解放军国防科技大学 | Method and device for stabilizing scale factor of optical suspension acceleration sensor |
| CN114755457A (en) * | 2022-04-06 | 2022-07-15 | 中国人民解放军国防科技大学 | Method for measuring scale factor of optical levitation acceleration sensor on line |
| CN114910662A (en) * | 2022-04-26 | 2022-08-16 | 浙江大学 | Device and method for realizing high-vacuum environment suspension microspheres by combining magnetic traps and optical traps |
| CN115980470A (en) * | 2023-03-20 | 2023-04-18 | 之江实验室 | Rapid calibration method for nano-particle net electric quantity based on vacuum optical tweezers |
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| CN107607047A (en) * | 2017-09-14 | 2018-01-19 | 中国人民解放军国防科技大学 | Method for correcting misalignment of axis of image sensor in double-beam optical trap |
| CN108426633A (en) * | 2018-05-25 | 2018-08-21 | 浙江大学 | A kind of vibration measuring method and vibration detecting device based on ligh trap |
| CN108426633B (en) * | 2018-05-25 | 2020-04-28 | 浙江大学 | Vibration measurement method and device based on optical trap |
| CN111044417A (en) * | 2019-12-11 | 2020-04-21 | 之江实验室 | Device for detecting particle size by using mechanical effect of light and testing method |
| CN111983708A (en) * | 2020-08-07 | 2020-11-24 | 浙江大学 | Gravity measurement device and method based on optical trap |
| CN112255578A (en) * | 2020-12-08 | 2021-01-22 | 之江实验室 | Device and method for sensing multiple physical parameters based on optical tweezers and spin defects |
| CN112255578B (en) * | 2020-12-08 | 2021-03-09 | 之江实验室 | Device and method for sensing multiple physical parameters based on optical tweezers and spin defects |
| CN114205929A (en) * | 2022-02-15 | 2022-03-18 | 之江实验室 | Infrared optical system for heating suspended nanoparticles |
| CN114755457A (en) * | 2022-04-06 | 2022-07-15 | 中国人民解放军国防科技大学 | Method for measuring scale factor of optical levitation acceleration sensor on line |
| CN114720722A (en) * | 2022-04-06 | 2022-07-08 | 中国人民解放军国防科技大学 | Method and device for stabilizing scale factor of optical suspension acceleration sensor |
| CN114509311A (en) * | 2022-04-20 | 2022-05-17 | 浙江大学 | Device for efficiently capturing aerosol by using suspended optical tweezers and application method thereof |
| CN114509311B (en) * | 2022-04-20 | 2022-08-23 | 浙江大学 | Device for efficiently capturing aerosol by using suspended optical tweezers and application method thereof |
| CN114910662A (en) * | 2022-04-26 | 2022-08-16 | 浙江大学 | Device and method for realizing high-vacuum environment suspension microspheres by combining magnetic traps and optical traps |
| CN114910662B (en) * | 2022-04-26 | 2023-05-23 | 浙江大学 | Device and method for realizing high-vacuum environment suspension microsphere by combining magnetic trap and optical trap |
| CN115980470A (en) * | 2023-03-20 | 2023-04-18 | 之江实验室 | Rapid calibration method for nano-particle net electric quantity based on vacuum optical tweezers |
| CN115980470B (en) * | 2023-03-20 | 2023-07-21 | 之江实验室 | Nanometer particle net electric quantity rapid calibration method based on vacuum optical tweezers |
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