CN110441200B - Laser measuring device - Google Patents
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- CN110441200B CN110441200B CN201810421766.5A CN201810421766A CN110441200B CN 110441200 B CN110441200 B CN 110441200B CN 201810421766 A CN201810421766 A CN 201810421766A CN 110441200 B CN110441200 B CN 110441200B
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- 239000007788 liquid Substances 0.000 claims abstract description 108
- 230000003287 optical effect Effects 0.000 claims abstract description 39
- 230000005540 biological transmission Effects 0.000 claims abstract description 17
- 238000003384 imaging method Methods 0.000 claims description 17
- 230000001678 irradiating effect Effects 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims 1
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- 239000002245 particle Substances 0.000 description 12
- 238000005259 measurement Methods 0.000 description 11
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means
- G01N15/0227—Investigating particle size or size distribution by optical means using imaging; using holography
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Abstract
The embodiment of the invention discloses a laser measuring device, which comprises: the device comprises a laser, a collimating optical element, a liquid accommodating device and an image acquisition module; the liquid accommodating device is used for accommodating liquid to be measured; the laser is positioned on one side of the liquid accommodating device and is used for emitting laser beams; the collimating optical element is positioned between the laser and the liquid containing device and is used for collimating the laser beam, and the collimated laser beam is emitted to the liquid containing device; the image acquisition module is arranged behind the liquid accommodating device along the propagation direction of the laser beam incident to the liquid accommodating device and is used for acquiring a light spot image of transmission light formed after the laser beam irradiates the liquid accommodating device.
Description
Technical Field
The invention relates to the technical field of instruments and meters, in particular to a laser measuring device.
Background
In the propagation of light, the wave front is limited by the gap holes or particles which are equivalent to the wavelength scale, the emission which takes each element wave at the limited wave front as a source is subjected to spatial interference to generate diffraction and scattering, and the spatial (angular) distribution of the diffracted and scattered light energy is related to the wavelength of the light wave and the scale of the gap holes or particles. Laser is used as a light source, light is monochromatic light with a certain wavelength, and the spatial (angular) distribution of diffracted and scattered light energy is only related to the particle size. For the diffraction of the particle group, the size of each particle grade determines the light energy obtained at each specific angle, and the proportion of the light energy at each specific angle in the total light energy reflects the distribution degree of each particle grade.
The existing laser particle analyzer generally adopts a surface emitting laser and a beam expanding lens to combine, and the beam emitted by the surface emitting laser is expanded by the beam expanding lens to realize the measurement of the particle size of the gas, but the surface emitting laser is a solid laser with light emitted from the direction vertical to the surface of a semiconductor substrate, and the accuracy of the measurement result is limited by the light energy density of the solid laser; secondly, when the laser particle analyzer measures the liquid particle size, the measurement accuracy of the laser particle analyzer is influenced by the material, the placement position and the like of the selected measuring cup, so that the application range of the laser particle analyzer is influenced.
Disclosure of Invention
In view of this, the main object of the present invention is to provide a laser measuring device with higher optical energy density, higher measuring accuracy and stronger application performance.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a laser measuring device, comprising: the device comprises a laser, a collimating optical element, a liquid accommodating device and an image acquisition module; the liquid containing device is used for containing liquid to be detected; the laser is positioned on one side of the liquid containing device and used for emitting laser beams; the collimating optical element is positioned between the laser and the liquid accommodating device and is used for collimating the laser beam and emitting the collimated laser beam to the liquid accommodating device; the image acquisition module is arranged behind the liquid accommodating device along the transmission direction of the laser beam incident to the liquid accommodating device and is used for acquiring a light spot image of transmission light formed after the laser beam irradiates the liquid accommodating device.
The laser is a point light source laser, and the collimating optical element comprises a collimating lens.
Wherein the collimating optical element further comprises a fast axis collimating lens; the fast axis collimating lens is arranged between the laser and the collimating lens.
Wherein the laser measuring device further comprises a line laser generator; the line laser generator is arranged between the collimating lens and the liquid accommodating device and used for forming a line laser.
The laser comprises at least two point light source lasers, the collimating optical element comprises collimating lenses with the same number as the point light source lasers, and the collimating lenses are respectively arranged corresponding to the point light source lasers; the laser beams emitted by the at least two point light source lasers form linear laser after passing through the at least two collimating lenses.
The laser comprises at least two point light source lasers, the collimating optical element comprises collimating lenses and fast-axis collimating lenses, the number of the collimating lenses is the same as that of the point light source lasers, and the laser measuring device further comprises line laser generators, the number of the line laser generators is the same as that of the point light source lasers; each point light source laser device is arranged with a fast axis collimating lens, a collimating lens and a line laser generator that correspond in proper order, the laser beam that each point light source laser device sent passes through the correspondence in proper order fast axis collimating lens with form a line laser behind the line laser generator, the array orientation of two at least point light source laser devices with the direction of a line laser that line laser generator formed is different, the laser beam that two at least point light source laser devices sent passes through the correspondence respectively fast axis collimating lens with the collimating lens with form a laser behind the line laser generator.
The laser measuring device comprises at least three point light source lasers, the point light source lasers are distributed in an array mode, the collimating optical element comprises collimating lenses the number of which is the same as that of the point light source lasers, and the collimating lenses and the point light source lasers are respectively arranged correspondingly; the laser beams emitted by the at least three point light source lasers form surface laser after passing through the corresponding collimating lenses.
The laser device comprises at least two point light source lasers, the collimating optical element comprises a fast axis collimating lens and a slow axis collimating lens, the laser measuring device further comprises reflectors, and the number of the fast axis collimating lens, the number of the slow axis collimating lens and the number of the reflectors respectively correspond to the number of the point light source lasers; each point light source laser and a corresponding fast axis collimating lens, a slow axis collimating lens and a reflector are arranged in sequence, a laser beam emitted by each point light source laser sequentially passes through the corresponding fast axis collimating lens and the corresponding slow axis collimating lens to form linear laser to be emitted to the corresponding reflector, and the reflector is used for splicing the laser beam after being reflected to form surface laser and emitting the surface laser to the liquid accommodating device.
The image acquisition module comprises a CCD image sensor or a CMOS image sensor.
The image acquisition module further comprises an imaging lens; the imaging lens is arranged between the liquid accommodating device and the CCD image sensor or the CMOS image sensor and is used for gathering the transmission light rays formed by irradiating the laser beams to the liquid accommodating device.
An embodiment of the present invention provides a laser measurement apparatus, including: the device comprises a laser, a collimating optical element, a liquid accommodating device and an image acquisition module; the liquid accommodating device is used for accommodating liquid to be measured; the laser is positioned on one side of the liquid accommodating device and is used for emitting laser beams; the collimating optical element is positioned between the laser and the liquid containing device and is used for collimating the laser beam, and the collimated laser beam is emitted to the liquid containing device; the image acquisition module is used for acquiring a light spot image of transmission light formed after the laser beam irradiates the liquid accommodating device; by arranging the liquid accommodating device, the liquid to be measured is accommodated, and the influence of different materials or different positions of the measuring cup selected in the measuring process on the measuring result can be avoided; the image acquisition module is arranged in the transmission direction of the laser beam incident to the liquid containing device and behind the liquid containing device, so that the transmission light formed after the laser beam irradiates the liquid containing device is acquired; through laser instrument, collimation optical element, liquid accommodate device and image acquisition module, realize the measurement of the liquid that awaits measuring, low in cost and light energy density are higher.
Drawings
FIG. 1 is a schematic diagram of a laser measuring device according to an alternative embodiment of the present invention;
FIG. 2 is a schematic diagram of a laser measuring device according to an alternative embodiment of the present invention;
FIG. 3 is a schematic diagram of a laser measuring device according to an alternative embodiment of the present invention;
FIG. 4 is a schematic diagram of a laser measuring device according to an alternative embodiment of the present invention;
FIG. 5 is a schematic diagram of a laser measuring device according to an alternative embodiment of the present invention;
FIG. 6 is a schematic diagram of a laser measuring device according to an alternative embodiment of the present invention;
FIG. 7 is a schematic diagram of a laser measuring device according to an alternative embodiment of the present invention;
FIG. 8 is a schematic diagram of a laser measuring device according to an alternative embodiment of the present invention;
FIG. 9 is a schematic diagram of a laser measuring device according to an alternative embodiment of the present invention;
fig. 10 is a schematic structural diagram of an imaging lens according to an alternative embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings, and all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a laser measuring apparatus, referring to fig. 1, the laser measuring apparatus includes: the device comprises a laser 101, a collimating optical element 102, a liquid accommodating device 103 and an image acquisition module 104; the liquid accommodating device 103 is used for accommodating liquid to be measured, the collimating optical element 102 and the image acquisition module 104 are located on the same side of the liquid accommodating device 103, and the liquid accommodating device 103 is located at the intersection of the central axis of the collimating optical element 102 and the central axis of the image acquisition module 104; the laser 101 is arranged on one side of the collimating optical element 102 and is used for emitting a laser beam; the collimating optical element 102 is configured to collimate the laser beam, and the collimated laser beam is emitted to the liquid storage apparatus 103; the image acquisition module 104 is configured to acquire a light spot image of the transmission light formed after the laser beam irradiates the liquid accommodating apparatus 103.
In an embodiment of the present invention, a laser measuring apparatus includes: the device comprises a laser 101, a collimating optical element 102, a liquid containing device 103 and an image acquisition module 104; the liquid accommodating device 103 is used for accommodating liquid to be measured; the laser 101 is positioned on one side of the liquid accommodating device 103 and is used for emitting laser beams; the collimating optical element 102 is located between the laser 101 and the liquid containing device 103, and is configured to collimate the laser beam, and emit the collimated laser beam to the liquid containing device 103; the device is used for acquiring a light spot image of transmission light formed after the laser beam irradiates the liquid accommodating device 103; by arranging the liquid accommodating device 103, the liquid to be measured is accommodated, and the influence of different materials or different positions of the measuring cup selected in the measuring process on the measuring result can be avoided; the image acquisition module 104 is arranged behind the liquid containing device 103 along the propagation direction of the laser beam incident on the liquid containing device 103, so that the transmission light formed after the laser beam irradiates the liquid containing device 103 is acquired; through laser 101, collimation optical element 102, liquid accommodate device 103 and image acquisition module 104, realize the measurement of the liquid that awaits measuring, low in cost and light energy density are higher.
Here, referring to fig. 2, the laser 101 is a point light source laser, and the collimating optical element 102 includes a collimating lens 201. Specifically, the laser 101 is a point light source laser, which may be a semiconductor laser, and the light spot of the point light source laser is a square or oval shape with a size of 1000 μm × 200 μm; by using the collimator lens 201, it is realized that the laser beam emitted from the laser 101 is converted into parallel light. Optionally, the laser measuring device further includes a housing (not shown), and the laser 101, the collimating optical element 102, the liquid containing device 103, and the image capturing module 104 are all contained in the housing, so that the laser measuring device is formed as a whole.
Here, referring to fig. 3, the collimating optical element 102 further includes a fast axis collimating lens 301; the fast axis collimating lens 301 is disposed between the laser 101 and the collimating lens 201. Specifically, the fast axis collimating lens 301 is arranged between the laser 101 and the collimating lens 201, and the fast axis collimating lens 301 compresses the fast axis beam divergence angle, so that the divergence angle of the laser beam emitted by the laser 101 is compressed to be within 1mrad, and the divergence angle of the laser beam is reduced.
Here, referring to fig. 4, the laser measuring apparatus further includes a line laser generator 401; the line laser generator 401 is disposed between the collimating lens 201 and the liquid storage device 103, and is configured to form a line laser. Specifically, the line laser generator may be a wave mirror or a powell prism. By adopting the line laser generator, the line laser is obtained, the measurement area is increased, and the utilization rate of the laser is improved.
Here, referring to fig. 5, in another alternative embodiment, the laser 101 includes at least two point light source lasers, the collimating optical element 102 includes collimating lenses 201, the number of which is the same as that of the point light source lasers, and the collimating lenses 201 are respectively disposed corresponding to the point light source lasers; the laser beams emitted by the at least two point light source lasers form line laser after passing through the at least two collimating lenses 201. By adopting the at least two point light source lasers and the collimating lenses 201 with the same number as the point light source lasers, the light spots of the laser beams emitted by the at least two point light source lasers form an intermittent straight line, the measurement area is increased, and the light energy density is ensured.
Here, referring to fig. 6, in a further alternative embodiment, the laser 101 includes at least two point light source lasers, the collimating optical element 102 includes the same number of collimating lenses 201 and fast-axis collimating lenses 301 as the point light source lasers, and the laser measuring apparatus further includes the same number of line laser generator line laser generators 401 as the point light source lasers; each point light source laser instrument with a fast axle collimating lens 301, a collimating lens 201 and a line laser generator 401 that correspond arrange in proper order, the laser beam that each point light source laser instrument sent passes through in proper order the correspondence fast axle collimating lens 301 collimating lens 201 with form a word line laser behind the line laser generator 401, the array orientation of two at least point light source laser instruments with the direction of a word line laser that line laser generator 401 formed is different, two at least point light source laser instruments send laser beam respectively through corresponding fast axle collimating lens 301 collimating lens 201 with form a laser behind the line laser generator 401. Specifically, by adopting at least two point light source lasers, and the collimating lenses 201, the fast axis collimating lenses 301 and the line laser generators 401 which are the same in number as the point light source lasers, laser beams emitted by each point light source laser sequentially pass through the corresponding fast axis collimating lenses 301, the collimating lenses 201 and the line laser generators 401 to form a line laser, so that at least two line lasers are formed, the at least two line lasers determine a plane, the measuring area is increased, and the utilization rate of the lasers is improved.
Here, referring to fig. 7, in another alternative embodiment, the laser measuring apparatus includes at least three point light source lasers, the point light source lasers are distributed in an array, the collimating optical element 102 includes collimating lenses 201, the number of which is the same as that of the point light source lasers, and the collimating lenses 201 and the point light source lasers are respectively disposed correspondingly; the laser beams emitted by the at least three point light source lasers form surface lasers after passing through the corresponding collimating lenses 201. By adopting at least three point light source lasers which are distributed in an array manner and the collimating lenses 201 with the same number as the point light source lasers, light spots of laser beams emitted by the at least three electric light source lasers form a plane formed by multiple points, the measuring area is increased, and the light energy density is ensured.
Here, referring to fig. 8, the laser 101 includes at least two point light source lasers, the collimating optical element includes a fast axis collimating lens 301 and a slow axis collimating lens 801, the laser measuring apparatus further includes a reflector 802, and the numbers of the fast axis collimating lens 301, the slow axis collimating lens 801 and the reflector 802 respectively correspond to the numbers of the point light source lasers; each point light source laser and a corresponding fast axis collimating lens 301, a slow axis collimating lens 801 and a reflector 802 are arranged in sequence, a laser beam emitted by each point light source laser sequentially passes through the corresponding fast axis collimating lens 301 and the corresponding slow axis collimating lens 801 to form linear laser, and then is emitted to the corresponding reflector 802, and the reflector 802 is used for splicing the laser beam after being reflected to form surface laser, and then is emitted to the liquid accommodating device 103. Specifically, at least two point light source lasers, and a fast axis collimating lens 301, a slow axis collimating lens 801, and a reflecting mirror 802, which are the same in number as the electric light source lasers, are used, each point light source laser is sequentially arranged with a corresponding fast axis collimating lens 301, a corresponding slow axis collimating lens 801, and a reflecting mirror 802, a laser beam emitted by each point light source laser sequentially passes through the corresponding fast axis collimating lens 301 and the corresponding slow axis collimating lens 801 to form a linear laser, and is emitted to the corresponding reflecting mirror 802, the direction and the distance of the laser beam incident to the liquid accommodating device 103 are adjusted by the reflecting mirror 802, and the reflecting mirror 802 is used for splicing the laser beam after being reflected to form a seamless surface laser, and is emitted to the liquid accommodating device 103, so that the measurement area is increased, and the light energy density is ensured. In an alternative embodiment, an aperture is provided between the mirror 802 and the liquid containing device 103 for limiting the shape of the surface laser.
Here, referring to fig. 9, the image capturing module 104 includes a CCD image sensor or a CMOS image sensor. The image acquisition module 104 includes an image sensor 901, and the image sensor 901 is a CCD image sensor or a CMOS image sensor. The CCD image sensor has high sensitivity, good reliability, wide spectral response and compact structure, and the imaging quality and the sensitivity of the laser measuring device are improved by adopting the CCD image sensor; because the CMOS image sensor has simple structure, high integration level and low cost, the manufacturing cost of the laser measuring device is reduced by adopting the CMOS sightseeing component. In an optional embodiment, the image capturing module 104 includes a photodiode or a phototransistor, and is configured to receive transmitted light. In another alternative embodiment, the CCD image sensor or CMOS image sensor may be a linear CCD image sensor or CMOS image sensor.
Here, the image capturing module 104 may further include an imaging lens 902; the imaging lens 902 is disposed between the liquid container 103 and the CCD image sensor or the CMOS image sensor, and is configured to collect the transmitted light formed by the laser beam irradiated to the liquid container 103.
In an alternative embodiment, the imaging lens 902 may be a single convex lens, which is used to collect the transmission light formed by the laser beam irradiating the liquid storage apparatus 103, and a single convex lens is used to achieve the function of collecting the transmission light, thereby simplifying the structure and reducing the cost.
In another alternative embodiment, the imaging lens 902 is a lens group comprising at least two lenses. Specifically, referring to fig. 10, the imaging lens assembly 902 includes, in order from an object side to an image side, a first lens element 1001, a second lens element 1002 and a third lens element 1003; the first lens element 1001 has positive refractive power, and has a convex object-side surface and a flat image-side surface; the second lens 1002 has negative focal power, and both the object-side surface and the image-side surface thereof are concave; the third lens 1003 has positive refractive power, and both the object-side surface and the image-side surface thereof are convex. The distances between the first lens 1001 and the second lens 1002, and between the second lens 1002 and the third lens 1003 are not more than 5mm, and the combined focal length of the first lens 1001, the second lens 1002 and the third lens 1003 is 6-35 mm. The imaging lens formed by the first lens 1001, the second lens 1002 and the third lens 1003 has a wide angle of view and good imaging quality.
An embodiment of the present invention provides a laser measurement apparatus, including: the device comprises a laser 101, a collimating optical element 102, a liquid accommodating device 103 and an image acquisition module 104; the liquid accommodating device 103 is used for accommodating liquid to be measured; the laser 101 is positioned on one side of the liquid accommodating device 103 and is used for emitting laser beams; the collimating optical element 102 is located between the laser 101 and the liquid containing device 103, and is configured to collimate the laser beam, and emit the collimated laser beam to the liquid containing device 103; the laser light source is used for collecting a light spot image of transmission light formed after the laser light beam irradiates the liquid accommodating device 103; by arranging the liquid containing device 103, the liquid to be measured is contained, and meanwhile, due to the existence of the liquid containing device 103, the measuring results are prevented from being influenced by different liquid containing devices 103 of the liquid to be measured; by arranging the image acquisition module 104 behind the liquid containing device 103 along the propagation direction of the laser beam incident on the liquid containing device 103, the acquisition of the transmitted light formed after the laser beam irradiates the liquid containing device 103 is realized; the measurement of the liquid to be measured is realized through the laser 101, the collimating optical element 102, the liquid containing device 103 and the image acquisition module 104, and the device is low in manufacturing cost and high in light energy density.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (6)
1. A laser measuring device, comprising: the device comprises a laser, a collimating optical element, a liquid accommodating device and an image acquisition module; the liquid accommodating device is used for accommodating liquid to be measured;
the laser is a point light source laser, is positioned on one side of the liquid accommodating device and is used for emitting laser beams;
the collimating optical element comprises a fast-axis collimating lens and a collimating lens which are sequentially arranged, is positioned between the laser and the liquid containing device and is used for collimating the laser beam, and the collimated laser beam is emitted to the liquid containing device;
the laser measuring device further comprises a line laser generator;
the laser at least comprises two point light source lasers, and the collimating optical element comprises collimating lenses, fast-axis collimating lenses and linear laser generators, wherein the number of the collimating lenses is the same as that of the point light source lasers; wherein, the first and the second end of the pipe are connected with each other,
each point light source laser and a corresponding fast axis collimating lens, a collimating lens and a line laser generator are arranged in sequence, a laser beam emitted by each point light source laser sequentially passes through the corresponding fast axis collimating lens, the corresponding collimating lens and the line laser generator to form a line laser, the arrangement direction of the at least two point light source lasers is different from the direction of the line laser formed by the line laser generator, and the laser beams emitted by the at least two point light source lasers form a surface laser after respectively passing through the corresponding fast axis collimating lens, the corresponding collimating lens and the line laser generator;
The image acquisition module is arranged behind the liquid accommodating device along the propagation direction of the laser beam incident to the liquid accommodating device and is used for acquiring a light spot image of transmission light formed after the laser beam irradiates the liquid accommodating device;
the image acquisition module comprises a CCD image sensor or a CMOS image sensor and also comprises an imaging lens; the imaging lens is arranged between the liquid accommodating device and the CCD image sensor or the CMOS image sensor and is used for gathering transmission light rays formed by irradiating the laser beams to the liquid accommodating device;
the imaging lens sequentially comprises a first lens, a second lens and a third lens from an object side surface to an image side surface; the first lens has positive focal power, the object-side surface of the first lens is a convex surface, and the image-side surface of the first lens is a plane; the second lens has negative focal power, and the object side surface and the image side surface of the second lens are both concave surfaces; the third lens has positive focal power, and both the object-side surface and the image-side surface of the third lens are convex surfaces.
2. The laser measuring device of claim 1, wherein the fast axis collimating lens is disposed between the laser and the collimating lens.
3. The laser measuring device of claim 2, further comprising a line laser generator;
the line laser generator is arranged between the collimating lens and the liquid accommodating device and used for forming a line laser.
4. The laser measuring device according to claim 1, wherein the collimating lenses are respectively disposed corresponding to the point light source lasers;
the laser beams emitted by the at least two point light source lasers form linear laser after passing through the at least two collimating lenses.
5. The laser measuring device of claim 1, wherein the laser measuring device comprises at least three point light source lasers, the point light source lasers are distributed in an array, the collimating optical element comprises collimating lenses with the same number as the point light source lasers, and the collimating lenses are respectively arranged corresponding to the point light source lasers;
the laser beams emitted by the at least three point light source lasers form surface laser after passing through the corresponding collimating lenses.
6. A laser measuring device, comprising: the device comprises a laser, a collimating optical element, a liquid accommodating device and an image acquisition module; the liquid accommodating device is used for accommodating liquid to be measured;
The laser is a point light source laser, is positioned on one side of the liquid accommodating device and is used for emitting laser beams;
the collimating optical element comprises a fast axis collimating lens and a slow axis collimating lens, and is positioned between the laser and the liquid containing device and used for collimating the laser beam and emitting the collimated laser beam to the liquid containing device;
the laser measuring device also comprises a reflector;
the laser at least comprises two point light source lasers, and the collimating optical element comprises fast-axis straight lenses, slow-axis collimating lenses and reflectors which are the same as the point light source lasers in number; wherein the content of the first and second substances,
each point light source laser and a corresponding fast axis collimating lens, a slow axis collimating lens and a reflector are arranged in sequence, a laser beam emitted by each point light source laser sequentially passes through the corresponding fast axis collimating lens and the corresponding slow axis collimating lens to form linear laser, the linear laser is emitted to the corresponding reflector, and the reflector is used for reflecting the laser beam, splicing the laser beam to form surface laser and emitting the surface laser to the liquid accommodating device;
The image acquisition module is arranged behind the liquid accommodating device along the propagation direction of the laser beam incident to the liquid accommodating device and is used for acquiring a light spot image of transmission light formed after the laser beam irradiates the liquid accommodating device;
the image acquisition module comprises a CCD image sensor or a CMOS image sensor and also comprises an imaging lens; the imaging lens is arranged between the liquid accommodating device and the CCD image sensor or the CMOS image sensor and is used for gathering transmission light rays formed by irradiating the laser beams to the liquid accommodating device;
the imaging lens sequentially comprises a first lens, a second lens and a third lens from an object side surface to an image side surface; the first lens has positive focal power, the object-side surface of the first lens is a convex surface, and the image-side surface of the first lens is a plane; the second lens has negative focal power, and the object side surface and the image side surface of the second lens are both concave surfaces; the third lens has positive focal power, and both the object-side surface and the image-side surface of the third lens are convex surfaces.
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