System for capturing aerosol through optical fiber and optical tweezers

Abstract

The utility model discloses a system for capturing aerosol by optical fiber optical tweezers. The system comprises a laser emitting a laser beam, and an isolator, a beam expander group, a half-wave plate and a polarization beam splitter which are sequentially arranged on a light path of the laser beam, the optical fiber optical tweezers aerosol capturing system further comprises a first optical fiber, a second optical fiber and a capturing chamber, the polarization beam splitter divides the laser beam into a first light beam and a second light beam, the first light beam and the second light beam are coupled into the input ends of the first optical fiber and the second optical fiber respectively, and the output ends of the first optical fiber and the second optical fiber enter the capturing chamber; the capturing chamber is provided with an imaging device and a lighting device for monitoring the capturing process, and the output ends of the first optical fiber and the second optical fiber are located on the two opposite sides of the capturing chamber respectively. The optical fiber optical tweezers aerosol capturing system is compact in structure, convenient to carry and operate, capable of being conveniently integrated with other experimental equipment, high in flexibility, free of expensive optical elements and low in cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of optical fiber optical tweezers, specifically, the utility model relates to optical fiber optical tweezers capture aerosol system. BACKGROUND

[0002] Aerosol refers to a colloidal dispersion system formed by dispersing and suspending solid or liquid small particles in gaseous medium, which not only affects atmospheric climate and air quality, but also harms human health. At present, the research and isolation of single biomass aerosol process are very difficult, the main reason is that biomass aerosol is usually small particles moving quickly and continuously interacting with the environment, and in order to study biomass aerosol, it must be captured, operated and cannot damage its original state. The optical capture device system for studying traditional biomass aerosol is relatively complex, expensive and needs professional operators, so it is necessary to seek an aerosol capture device with simpler structure, smaller size, more convenient and flexible operation and lower cost. UTILITY MODEL CONTENT

[0003] Therefore, the utility model overcomes at least one defect of prior art, provides an optical fiber optical tweezers capture aerosol system, which is compact in structure, convenient to carry and operate, can be easily integrated with other experimental equipment, high in flexibility, and does not need expensive optical elements, and is low in cost.

[0004] The technical scheme is as follows:

[0005] An optical fiber optical tweezers capture aerosol system, comprising a laser for emitting a laser beam, an isolator, a beam expander, a half-wave plate and a polarization beam splitter arranged in sequence on the optical path of the laser beam; the optical fiber optical tweezers capture aerosol system further comprises a first optical fiber and a second optical fiber for transmitting the laser beam, and a capture chamber for capturing aerosol, the polarization beam splitter divides the laser beam into a first beam and a second beam, the first beam and the second beam are coupled into the input ends of the first optical fiber and the second optical fiber respectively, and the output ends of the first optical fiber and the second optical fiber enter the capture chamber; the capture chamber is provided with an imaging device and an illumination device for monitoring the capture process, and the output ends of the first optical fiber and the second optical fiber are located on two opposite sides of the capture chamber respectively so as to form a stable optical field capture area in the capture chamber.

[0006] In one embodiment, a first mirror and a second mirror for deflecting the direction of the laser beam are further arranged between the isolator and the beam expander, and the laser beam deflected by the first mirror and the second mirror is incident on the beam expander in a direction parallel to the laser beam emitted by the laser.

[0007] In one embodiment, the imaging device comprises a CMOS camera and a long focal length objective lens, and the long focal length objective lens is located on the side close to the capture chamber, the long focal length objective lens is a 20 times working distance objective lens, and the imaging device is connected with an external computer analysis system.

[0008] In one embodiment, the illumination device is a Kohler illumination device, and the Kohler illumination device and the imaging device are located on the other two opposite sides of the capture chamber.

[0009] In one embodiment, the capture chamber is a 3D printed transparent capture chamber with a sealed structure.

[0010] In one embodiment, the first optical fiber and the second optical fiber are both single-mode optical fibers, the first light beam and the second light beam are coupled into the single-mode optical fibers through a 10 times objective lens respectively, and the mode field diameter of the single-mode optical fiber at a wavelength of 488nm ranges from 2.8 μ m to 4.1 μ m.

[0011] In one embodiment, the first optical fiber is a multi-mode optical fiber, and the second optical fiber is a single-mode optical fiber.

[0012] In one embodiment, a spatial light modulator for dynamically adjusting the output light field distribution of the multi-mode optical fiber is arranged on the light path of the first light beam.

[0013] In one embodiment, the optical fiber optical tweezers aerosol capture system further comprises an optical fiber holder for clamping the first optical fiber and the second optical fiber.

[0014] In one embodiment, an environmental control unit is further provided outside the capture chamber, and the environmental control unit comprises a humidity regulator and a temperature controller.

[0015] In one embodiment, the beam expander lens group is a 6 times telescope system beam expander lens group for expanding the diameter of a laser beam.

[0016] The beneficial effects of the utility model lie in:

[0017] The utility model adopts the double optical fiber opposite structure arranged reversely, forms the construction of single biomass aerosol capture potential well, and makes the optical fiber optical tweezers aerosol capture device have three unique advantages:

[0018] (1) The device is miniaturized: the overall structure of the device is compact, and it is convenient to carry and operate;

[0019] (2) The device is easy to integrate: the device can be easily integrated with other experimental equipment, and the flexibility is high;

[0020] (3) Low cost: no need for expensive optical elements, reducing the cost of experiments and equipment. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of the optical fiber light tweezers aerosol trapping system of Example 1.

[0022] Figure 2 A structural diagram of the optical fiber holder.

[0023] Figure 3 A schematic diagram of the structure of the optical fiber light tweezers aerosol trapping system of Example 2.

[0024] Brief description of the drawings: 1, laser; 2, isolator; 3, beam expander lens group; 4, half-wave plate; 5, polarization beam splitter; 6, single-mode optical fiber; 7, multi-mode optical fiber; 8, trapping chamber; 9, CMOS camera; 10, long focal length objective lens; 11, Kohler illuminator; 12, 10x objective lens; 13, first mirror; 14, second mirror; 15, spatial light modulator; 16, optical fiber holder. DETAILED DESCRIPTION

[0025] The drawings of the utility model are only used for illustrative description, and cannot be understood as the limitation of the utility model. In order to better illustrate the following embodiments, some components of the drawings will be omitted, enlarged or reduced, and the size of the actual product is not represented; for those skilled in the art, it is understandable that some well-known structures in the drawings and their descriptions can be omitted.

[0026] Example 1

[0027] As Figure 1 shown, an optical fiber light tweezers aerosol trapping system includes a laser 1 emitting a laser beam, an isolator 2, a beam expander lens group 3, a half-wave plate 4 and a polarization beam splitter 5 arranged in the optical path of the laser beam in turn; the optical fiber light tweezers aerosol trapping system further includes a first optical fiber, a second optical fiber for transmitting the laser beam and a trapping chamber 8 for trapping aerosols, the polarization beam splitter 5 divides the laser beam into a first beam and a second beam, the first beam and the second beam are coupled into the input ends of the first optical fiber and the second optical fiber through a 10x objective lens respectively, the output ends of the first optical fiber and the second optical fiber enter the trapping chamber 8; the trapping chamber 8 is provided with an imaging device and an illuminating device for monitoring the trapping process, the output ends of the first optical fiber and the second optical fiber are located on two opposite sides of the trapping chamber 8 respectively to facilitate the formation of a stable optical field trapping area in the trapping chamber 8. More specifically, in this embodiment, the first optical fiber and the second optical fiber are both single-mode optical fibers 6.

[0028] In this embodiment, the laser 1 emits a laser beam, which first passes through an isolator 2 to eliminate feedback interference, then passes through a beam expander 3 to expand the beam diameter, and then passes through a half-wave plate 4 and a polarization beam splitter 5 to divide the laser beam into two beams, which are then coupled into single-mode optical fibers 6 through two objective lenses. By precisely rotating the half-wave plate 4, the power distribution of the two laser beams can be flexibly adjusted, thereby realizing adaptive adjustment to different experimental conditions. The output ends of the two single-mode optical fibers 6 are directly introduced into a capture chamber 8, and the system effectively captures and manipulates aerosol particles through the optical field gradient force formed by the laser beams output by the optical fibers. The capture chamber 8 is equipped with imaging and illumination devices for observing and recording the captured single biomass aerosol particles. By analyzing the video data during the capture process, the size and other physical properties of the aerosol particles can be accurately analyzed.

[0029] Further, in this embodiment, the beam expander 3 is a 6x telescope system beam expander for expanding the diameter of the laser beam. The beam expander 3 is used to expand the diameter of the laser beam to the required size, thereby generating a stable optical field intensity distribution in the optical fiber optical tweezer aerosol capture system. The 6x telescope system ensures uniform expansion of the laser beam, effectively improving the uniformity of the optical field during the capture process, avoiding the situation of too high or too low beam energy concentration, thereby improving the overall efficiency of the system.

[0030] Further, in this embodiment, the laser is a high-power laser with a wavelength of 532 nm, which has high stability and high power output, ensuring a stable light source during the experiment.

[0031] Further, in this embodiment, the first and second beams are coupled into single-mode optical fibers through 10x objective lenses 12, and the mode field diameter of the single-mode optical fibers at a wavelength of 488 nm ranges from 2.8 μm to 4.1 μm, both using straight tip (ST) connectors.

[0032] Further, in this embodiment, the capture chamber 8 is a 3D printed transparent capture chamber with a sealed structure. The 3D printed transparent capture chamber has good mechanical strength and optical transmittance, can withstand multiple experiments, and is easy to replace and maintain. In addition, the 3D printed chamber design can be flexibly customized to meet the needs of different experiments, especially in cases where the chamber structure or size needs to be adjusted according to experimental conditions, providing high flexibility and operability.

[0033] Further, the imaging device comprises a CMOS camera 9 and a long focal length objective lens 10, and the long focal length objective lens 10 is located on the side close to the capture chamber 8, the long focal length objective lens 10 is a 20 times working distance objective lens, and the imaging device is connected with an external computer analysis system. The imaging device can provide high-resolution captured images, realize real-time tracking and recording of the motion trajectory of the aerosol particles, and the connection with the computer analysis system can further obtain the motion parameters and physical characteristics of the particles through algorithm analysis.

[0034] The illumination device is a Kohler illumination device 11, and the Kohler illumination device 11 and the imaging device are located on the other two opposite sides of the capture chamber 8. The Kohler illumination device 11 is used in the capture chamber, which can ensure uniform illumination and help to clearly capture the image of the micro aerosol particles. The Kohler illumination device 11 and the imaging device jointly record and monitor the dynamic change and capture process of the aerosol particles.

[0035] Further, the optical fiber light tweezers aerosol capturing system further comprises an optical fiber holder 16 for clamping the first optical fiber and the second optical fiber, and the structure of the optical fiber holder 16 is as shown in Figure 2 Due to the extremely small core diameter of the single-mode optical fiber 6 and the mechanical drift in the coupling process, the optimized maximum transmission power is about 50%, and the use of the optical fiber holder 16 ensures the stable control of the optical fiber coupling.

[0036] Further, a first mirror 13 and a second mirror 14 for deflecting the direction of the laser beam are arranged between the isolator 2 and the beam expander lens group 3, and the laser beam deflected by the first mirror 13 and the second mirror 14 is incident to the beam expander lens group 3 in a direction parallel to the laser beam emitted by the laser.

[0037] Further, the outside of the capture chamber is also provided with an environment control unit, and the environment control unit comprises a humidity regulator and a temperature controller. The environment control unit in the capture chamber provides a highly controllable experimental environment for the long-time suspension of aerosol particles, avoids experimental uncertainties caused by changes in temperature or humidity, and further improves the stability and capture efficiency of the system. The humidity regulator and the temperature controller can be conventional devices on the market, and here the devices will not be described and will not be embodied in the figure.

[0038] Example 2

[0039] As Figure 3As shown, the embodiment discloses a kind of optical fiber optical tweezers capture aerosol systems, including laser 1 that emits laser beam, isolator 2, beam expander lens group 3, half-wave plate 4 and polarizing beam splitter 5 are sequentially arranged on the optical path of the laser beam;The optical fiber optical tweezers capture aerosol system further includes first optical fiber, second optical fiber and capture chamber 8 for transmitting laser beam, the polarizing beam splitter 5 divides laser beam into first light beam, second light beam, first optical fiber is multimode optical fiber 7, second optical fiber is single-mode optical fiber 6, first light beam is coupled into the input end of first optical fiber by 10 times objective lens 12, second light beam is coupled into the input end of second optical fiber by 10 times objective lens 12, the output end of the first optical fiber, second optical fiber enters capture chamber 8;The capture chamber 8 is equipped with imaging device and illumination device for monitoring capture process, the output end of the first optical fiber and second optical fiber is located at the two opposite sides of the capture chamber 8 respectively to facilitate the formation of stable optical field capture area in capture chamber, the first optical fiber of the embodiment is multimode optical fiber 7, second optical fiber is single-mode optical fiber 6, and spatial light modulator 15 for dynamically adjusting the output light field distribution of the multimode optical fiber 7 is arranged on the optical path of first light beam.This embodiment is basically same with embodiment 1, the difference lies in, one of the laser beams is coupled into multimode optical fiber 7 in the embodiment 2, and spatial light modulator 15 is arranged to modulate the input light field of the multimode optical fiber 7.Adopting multimode optical fiber 7 and carrying out real-time modulation to light field by spatial light modulator 15 as required, generate a variety of light field shapes, so that the system can optimize capture effect under different experimental conditions, especially adapt to aerosol of different particle size and shape.

[0040] Obviously, the above embodiment of the utility model is merely for clearly illustrating the technical scheme of the utility model, and is not the limitation of the specific embodiment of the utility model. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the utility model claims should be included in the protection scope of the utility model claims.

Claims

1. An optical fiber lightwand aerosol capture system, comprising: The laser includes a laser for emitting a laser beam, an isolator, a beam expander, a half-wave plate and a polarization beam splitter arranged in sequence in the optical path of the laser beam. The optical fiber tweezers aerosol capturing system further includes a first optical fiber for transmitting the laser beam, a second optical fiber and a capturing chamber for capturing aerosols, the polarization beam splitter divides the laser beam into a first beam and a second beam, the first beam and the second beam are coupled into the input ends of the first optical fiber and the second optical fiber respectively, and the output ends of the first optical fiber and the second optical fiber enter the capturing chamber. The capturing chamber is provided with an imaging device and an illumination device for monitoring the capturing process, and the output ends of the first optical fiber and the second optical fiber are located on two opposite sides of the capturing chamber to form a stable optical field capturing area in the capturing chamber.

2. The fiber-optic light-scatter aerosol capture system of claim 1, wherein, A first mirror and a second mirror are further arranged between the isolator and the beam expander for deflecting the direction of the laser beam, and the laser beam deflected by the first mirror and the second mirror is incident on the beam expander in a direction parallel to the laser beam emitted by the laser.

3. The fiber-optic light-scatter aerosol trapping system of claim 1, wherein, The imaging device includes a CMOS camera and a long focal length objective lens, and the long focal length objective lens is located near one side of the capturing chamber, the long focal length objective lens is a 20 times working distance objective lens, and the imaging device is connected with an external computer analysis system.

4. The fiber-optic light-scatter aerosol capturing system of claim 3, wherein, The illumination device is a Kohler illumination device, and the Kohler illumination device and the imaging device are located on the other two opposite sides of the capturing chamber.

5. The fiber-optic light-scatter aerosol capturing system of claim 1, wherein, The capturing chamber is a 3D printed transparent capturing chamber with a sealed structure.

6. The fiber-optic light-scatter aerosol capturing system of claim 1, wherein, The first optical fiber and the second optical fiber are both single-mode optical fibers, the first beam and the second beam are coupled into the single-mode optical fibers through a 10 times objective lens, and the mode field diameter of the single-mode optical fiber at a wavelength of 488 nm ranges from 2.8 μm to 4.1 μm.

7. The fiber-optic light-scatter aerosol capturing system of claim 1, wherein, The first optical fiber is a multi-mode optical fiber, and the second optical fiber is a single-mode optical fiber.

8. The fiber-optic light-scatter aerosol capturing system of claim 7, wherein, A spatial light modulator is arranged on the optical path of the first beam for dynamically adjusting the output light field distribution of the multi-mode optical fiber.

9. The fiber-optic light-scatter aerosol capturing system according to claim 1, wherein, The optical fiber tweezers aerosol capturing system further includes an optical fiber holder for clamping the first optical fiber and the second optical fiber.

10. The fiber-optic light-scatter aerosol capturing system according to any one of claims 1 to 9, wherein, The outside of the capturing chamber is further provided with an environmental control unit, and the environmental control unit includes a humidity regulator and a temperature controller.

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