CN110231265B - Porous fluorescent ceramic porosity detection device and detection method thereof - Google Patents
Porous fluorescent ceramic porosity detection device and detection method thereof Download PDFInfo
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- 238000009792 diffusion process Methods 0.000 claims description 6
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Abstract
The invention provides a porous fluorescent ceramic porosity detection device and a detection method thereof, wherein the detection device comprises a test platform, a laser light source (100), a beam expanding assembly, a relay lens (300), a collection lens assembly (500) and a CCD assembly (600) are sequentially arranged on the test platform along the same central line, a detection position (400) is arranged between the relay lens (300) and the collection lens assembly (500), and the fluorescent ceramic to be detected and the standard fluorescent ceramic are respectively placed on the detection position for detection. According to the invention, according to the correlation between the fluorescence spot diffusivity and the content of the scattering center, namely the porosity, in the fluorescence ceramic, the spot diffusivity can be represented by detecting the ratio of the fluorescence spot size to the laser spot size, and the prepared fluorescence ceramic sample with consistent size is compared with a standard fluorescence ceramic sample for testing, so that whether the porosity meets the standard can be detected.
Description
Technical Field
The invention relates to a porous fluorescent ceramic porosity detection device and a detection method thereof, and belongs to the technical field of detection device manufacturing.
Background
The fluorescent ceramic is widely applied to high-power laser projection light sources due to excellent mechanical properties and high thermal conductivity of the fluorescent ceramic. Because the requirement of the projection light source system on the optical expansion is higher, when the laser facula excites the fluorescent ceramic to be converted into the light with the second wavelength, the phenomenon of fluorescent facula diffusion is required to be smaller. The air holes in the porous fluorescent ceramic mainly play a role in scattering light, the diffusion size of fluorescent light spots is closely related to the content of scattering centers in the ceramic, and the size of the fluorescent light spots influences the light efficiency utilization rate in a light source system.
At present, the main method for detecting the porosity of the porous fluorescent ceramic is an Archimedes drainage method, and the method has the main problems that: the testing steps are complicated, and the accuracy of the test is low due to the fact that the closed air hole cannot be tested.
Disclosure of Invention
The invention aims to solve the technical problem that the prior art is not enough, and provides a porous fluorescent ceramic porosity detection device and a detection method thereof.
The technical problem to be solved by the invention is realized by the following technical scheme:
the utility model provides a porous fluorescent ceramic porosity detection device, includes test platform last along same central line order set up laser source, expand subassembly, relay lens, collection battery of lens and CCD subassembly, set up between relay lens and the collection battery of lens and detect the position, the fluorescent ceramic that awaits measuring and standard fluorescent ceramic place respectively detect on the position.
The beam expanding assembly may employ a variety of components, as desired, and in particular, the beam expanding assembly comprises: positive and negative lens groups or a diffusion sheet.
More specifically, a light homogenizing assembly is further arranged between the beam expanding assembly and the relay lens; the dodging assembly comprises: a square rod or a fly-eye lens.
The CCD assembly comprises a CCD chip.
In addition, the imaging size is smaller than the size of the effective area of the CCD chip; the imaging size refers to the size of a light spot emitted from the collection lens group, and the size of the light spot is smaller than the size of the effective area of the CCD chip.
In order to reduce errors, a shading component is arranged between the relay lens and the detection position and is used for shading at least part of incident light; and/or a shading component is arranged between the detection position and the collection lens group and is used for shading at least part of emergent light.
The invention also provides a detection method of the porous fluorescent ceramic porosity detection device, which comprises the following steps:
step 100: placing standard porous fluorescent ceramic on the detection position, and testing and recording the size of a fluorescent light spot of the standard fluorescent ceramic;
step 200: placing the porous fluorescent ceramic to be tested on the detection position, and testing and recording the size of the fluorescent light spot of the standard fluorescent ceramic;
step 300: and comparing the size of the fluorescent light spot of the standard fluorescent ceramic with the size of the fluorescent light spot of the fluorescent ceramic to be detected, wherein the porosity of the fluorescent ceramic to be detected is qualified when the conditions are met.
Specifically, the conditions in step 300 are: the ratio of the size of the fluorescent light spot of the ceramic to be detected to the size of the fluorescent light spot of the standard ceramic is within 1 +/-0.05; or the difference value of the subtraction of the light spot of the standard fluorescent ceramic and the light spot of the fluorescent ceramic to be detected is within the range of +/-0.05 unit area.
Further, the standard porous fluorescent ceramic has a porosity of 3%.
In order to ensure that the detection result is accurate, the standard fluorescent ceramic and the fluorescent ceramic to be detected have the same size.
In summary, the invention provides a porous fluorescent ceramic porosity detection device and a detection method thereof, according to the correlation between the fluorescence spot diffusivity and the content of scattering centers, namely porosity, in the fluorescent ceramic, the ratio of the fluorescence spot size to the laser spot size is detected to represent the spot diffusivity, and the prepared fluorescent ceramic sample with consistent size is compared with a standard fluorescent ceramic sample to test whether the porosity meets the standard or not.
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a schematic structural diagram of a first embodiment of a detecting device according to the present invention;
FIG. 2 is a schematic diagram of a laser spot shape according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of the spot shape of a standard fluorescent ceramic according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a second embodiment of the detecting device of the present invention;
FIG. 5 is a schematic diagram of a laser spot shape according to a second embodiment of the present invention;
FIG. 6 is a schematic diagram of the spot shape of the standard fluorescent ceramic according to the second embodiment of the present invention.
Detailed Description
The invention provides a porous fluorescent ceramic porosity detection device which comprises a test platform, wherein a laser light source, a beam expanding assembly, a relay lens, a collection lens group and a CCD assembly are sequentially arranged on the test platform along the same central line, a detection position is arranged between the relay lens and the collection lens group, and a fluorescent ceramic to be detected and a standard fluorescent ceramic are respectively placed on the detection position for detection.
The beam expanding assembly may employ a variety of components, as desired, and in particular, the beam expanding assembly comprises: positive and negative lens groups or a diffusion sheet. More specifically, a light homogenizing assembly is further arranged between the beam expanding assembly and the relay lens; the dodging assembly comprises: a square rod or a fly-eye lens.
The CCD assembly comprises a CCD chip, and the imaging size can be smaller than the size of an effective area of the CCD chip by adjusting the collecting lens group. Further, the CCD assembly may include a lens in addition to the CCD chip, and it should be noted that the lens is an optional assembly. The working principle of the invention is that incident light emitted by a laser light source irradiates on a sample to be measured, the sample to be measured is excited and emits excited light, the excited light is Lambert light, the emission angle is larger, and a collection lens group enables divergent light beams to emit at a smaller angle, so that the imaging size needs to be in the effective range of a CCD chip, the imaging size refers to the size of a light spot emitted from a collection lens, and finally the size of the light spot is ensured to fall in the effective area of the CCD chip.
In order to reduce errors, a shading component is arranged between the relay lens and the detection position and is used for shading at least part of incident light; and/or a shading component is arranged between the detection position and the collection lens group and is used for shading at least part of emergent light.
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Example one
Fig. 1 is a schematic structural diagram of a detection apparatus according to a first embodiment of the present invention. As shown in fig. 1, the porosity detection device for porous fluorescent ceramics in this embodiment includes a test platform (not shown in the figure), on which a laser light source 100, a positive and negative lens assembly 200, a relay lens 300, a collecting lens assembly 500 and a CCD assembly 600 are sequentially disposed along the same central line, a detection position 400 is disposed between the relay lens 300 and the collecting lens assembly 500, and during detection, the fluorescent ceramics to be detected and the standard fluorescent ceramics are respectively placed on the detection position 400 for detection. Further, the CCD assembly 600 includes a CCD chip and a lens; the imaging size is smaller than the size of the effective area of the CCD chip, and can be changed by adjusting the focal length and the magnification of a lens in the CCD assembly, so that the imaging size is ensured to be in the effective range of the CCD chip.
It should be noted that the positive and negative lens group 200 belongs to a beam expanding assembly, which is used for expanding laser beams, and besides the positive and negative lens group, other components can be used to achieve the same function, such as: and a diffusion sheet. The relay lens 300 is used for focusing the laser beam to make the laser beam converge on the surface of the fluorescent ceramic to form an excitation spot with a predetermined size; for example 1: 1 spot ratio. The collecting lens assembly 500 is used for collecting the stimulated laser light generated after the fluorescent ceramic to be detected is excited, the laser light is lambert light, and the emission angle is large, so that the collecting lens assembly 500 can enable the divergent light beams to be emitted at a small angle, the small-angle light beams are easily collected by an imaging lens in the CCD assembly 600, clear and bright light spots are imaged on the surface of the light beams, and the interference caused by noise signals of the CCD is weakened.
In the porosity detection device of the porous fluorescent ceramic in the embodiment, the light ray direction is as follows: laser beams emitted by the laser light source 100 pass through the positive and negative lens groups 200 to form light beams with a certain angle, and then pass through the relay lens 300 and irradiate on the fluorescent ceramic to be detected placed at the detection position 400, so that the fluorescent ceramic is excited to emit light with a second wavelength, and the light emitted by the fluorescent ceramic is collected by the collecting lens group 500 and imaged on the CCD assembly 600.
FIG. 2 is a schematic diagram of a laser spot shape according to a first embodiment of the present invention; FIG. 3 is a schematic diagram of a spot shape of a standard fluorescent ceramic according to an embodiment of the present invention. The laser spot irradiated on the fluorescent ceramic in the porous fluorescent ceramic porosity detection device is a Gaussian spot S, and the shape of the laser spot is shown in FIG. 2.
Taking a square porous fluorescent ceramic as an example, the testing steps for detecting the porosity of the porous fluorescent ceramic by using the porous fluorescent ceramic porosity detection device are as follows:
first, a standard porous fluorescent ceramic, which is a production-acceptable sample having a size of usually 5mm × 5mm × 0.2mm and a porosity of about 3%, is placed on the detection site 400. The standard fluorescent ceramic was tested for the fluorescent spot size, designated as S1, and the fluorescent spot is shown in FIG. 3.
Secondly, the porous fluorescent ceramic to be tested is placed on the detection position 400, and the size of the fluorescent light spot of the fluorescent ceramic to be tested is measured and recorded as S2.
In order to ensure the accuracy of the detection result, the size of the fluorescent ceramic to be detected and the size and thickness of the standard fluorescent ceramic are required to be consistent.
And finally, comparing the size of the fluorescence light spot of the ceramic to be detected with that of the fluorescence light spot of the standard ceramic, and when S1: and when the ratio of S2 is within 1 +/-0.05, the porosity of the fluorescent ceramic to be measured is determined to be qualified.
In practical applications, the fluorescent ceramic may take various shapes, and may also take shapes such as a circle, a ring, etc., in addition to the square shape such as a rectangle, a square, etc., in the above embodiments. A shading component is arranged between the relay lens 300 and the detection position 400 to shade at least part of incident light; a light shielding component is also arranged between the detection position 400 and the collection lens group 500 to shield at least part of emergent light so as to reduce errors. When the emergent light is shielded, the size of the incident light which is incident to the standard or porous fluorescent ceramic to be detected is not required and can be larger than that of the porous fluorescent ceramic, and the shading component exists at the moment, so that part of the incident light can be prevented from irradiating on the CCD component, and the increase of errors is avoided. Such as: when the ceramic is circular, it is difficult for the excitation light emitted from the relay lens 300 to form a circular spot, and a light shielding member having a circular hole may be disposed between the detection site 400 and the relay lens 300, that is: the light shielding plate with the round hole can block the light rays incident outside the round hole, so that the error caused by the fact that the part of the light rays irradiate the CCD assembly 600 is avoided. Preferably, the size of the circular hole is consistent with that of the fluorescent ceramic, and light passing through the circular hole can be just and completely irradiated on the surface of the fluorescent ceramic. Similarly, when the ceramic is annular, the corresponding shutter assembly may be a shutter plate having an annular aperture, with the shutter assembly being disposed between the sensing position and the collection lens group. It can be understood that when the shading component is used, the size of incident light rays entering the standard or to-be-detected porous fluorescent ceramic is not required and can be larger than that of the porous fluorescent ceramic, and due to the existence of the shading component, part of the incident light rays can be prevented from irradiating the CCD component, so that the increase of errors is avoided.
In summary, in order to reduce the error, the incident light and the emergent light can be shielded respectively by the setting position of the light shielding component, or the incident light and the emergent light can be shielded simultaneously.
Example two
Fig. 4 is a schematic structural diagram of a second detection apparatus according to an embodiment of the present invention. The difference between this embodiment and the first embodiment is that, in this embodiment, in addition to the beam expanding assembly 201, a light uniformizing assembly is further disposed between the beam expanding assembly 201 and the relay lens 300, and in this embodiment, the light uniformizing assembly is a square rod 202. Specifically, as shown in fig. 4, in the present embodiment, the apparatus for detecting porosity of porous fluorescent ceramic includes a testing platform, on which a laser light source 100, a beam expanding assembly 201, a square rod 202, a relay lens 300, a collecting lens group 500 and a CCD assembly 600 are sequentially disposed along the same central line, and a detection position 400 is disposed between the relay lens 300 and the collecting lens group 500.
The square bar 202 functions to shape the geometry and size of the beam passing through the beam expander assembly 201 to shape the intensity distribution of the spot into a uniform intensity distribution that fills the designated geometry. In addition to the square bar 202 of the present embodiment, other components may be used to achieve the same effect, such as: fly-eye lenses. The square rod and the fly-eye lens are optical elements commonly used in the optical field, and also belong to the prior art, as long as the light beams penetrating through the beam expanding assembly can be completely collected, and the specific arrangement mode is not repeated herein.
FIG. 5 is a schematic diagram of a laser spot shape according to a second embodiment of the present invention; FIG. 6 is a schematic diagram of the spot shape of the standard fluorescent ceramic according to the second embodiment of the present invention. Compared with the first embodiment, in the present embodiment, the laser irradiated onto the fluorescent ceramic in the porous fluorescent ceramic porosity detection device is a uniform light spot, the laser light spot is as shown in fig. 5, the light spot boundary is clear, the calculation value error is small, and the test result is more accurate. As can be seen from fig. 2, the incident light shown in fig. 5 is a uniform square spot formed by the light homogenizing and shaping action of the square bar 202, and if no square bar is added, the incident light spot is a circular spot with gaussian distribution as shown in fig. 2.
Other contents in this embodiment are substantially the same as those in the first embodiment, and for detailed contents, reference is made to the description in the first embodiment, and details are not repeated here.
EXAMPLE III
In this embodiment, the porosity detection device of the porous fluorescent ceramic may adopt any one of the first embodiment and the second embodiment, and the optical path in the detection device is the same as that in the first embodiment or the second embodiment. The difference between the present embodiment and the first and second embodiments is that only the calculation method is changed, that is: and subtracting the light spot S1 of the standard fluorescent ceramic and the light spot S2 of the fluorescent ceramic to be tested, and determining that the porosity of the fluorescent ceramic to be tested is qualified when the difference S1-S2 of the two is within the unit area range of +/-0.05. It should be noted that, in practical applications, because the sizes of the selected ceramics are different, the sizes of the formed light spots are also different, and no matter what the sizes of the light spots of the standard fluorescent ceramics and the fluorescent ceramics to be measured are, in this embodiment, the difference between the areas of the light spots of the standard fluorescent ceramics and the fluorescent ceramics to be measured is within ± 0.05 unit area, that is, the porosity of the fluorescent ceramics to be measured is qualified.
Other contents in this embodiment are substantially the same as those in the first embodiment or the second embodiment, and for detailed contents, reference is made to the description in the first embodiment or the second embodiment, and details are not repeated here.
In summary, the invention provides a porous fluorescent ceramic porosity detection device and a detection method thereof, according to the correlation between the fluorescence spot diffusivity and the content of scattering centers, namely porosity, in the fluorescent ceramic, the ratio of the fluorescence spot size to the laser spot size is detected to represent the spot diffusivity, and the prepared fluorescent ceramic sample with consistent size is compared with a standard fluorescent ceramic sample to test whether the porosity meets the standard or not, so that the device has a compact structure, the test method is simple and rapid, and the accuracy is high; so as to ensure that the fluorescent ceramic which meets the standard is provided, and further ensure the optical utilization rate in the light source system.
Claims (10)
1. A porous fluorescent ceramic porosity detection device comprises a test platform and is characterized in that a laser light source (100), a beam expanding assembly, a relay lens (300), a collecting lens assembly (500) and a CCD assembly (600) are sequentially arranged on the test platform along the same central line, a detection position (400) is arranged between the relay lens (300) and the collecting lens assembly (500), and fluorescent ceramic to be detected and standard fluorescent ceramic are respectively placed on the detection position to detect the size of a fluorescent light spot;
and comparing the size of the fluorescence spot of the standard fluorescence ceramic with the size of the fluorescence spot of the fluorescence ceramic to be detected, wherein the porosity of the fluorescence ceramic to be detected is qualified when the conditions are met.
2. The porous fluorescent ceramic porosity detection apparatus of claim 1, wherein the beam expanding assembly comprises: positive and negative lens groups (200) or a diffusion sheet.
3. The porous fluorescent ceramic porosity detection device according to claim 1, wherein a light homogenizing assembly is further arranged between the beam expanding assembly and the relay lens (300);
the dodging assembly comprises: a square bar (202) or a fly-eye lens.
4. The porous fluorescent ceramic porosity detection device of any of claims 1-3, wherein the CCD assembly (600) comprises a CCD chip.
5. The porous fluorescent ceramic porosity detection device of claim 4, wherein the imaging size is smaller than the size of the CCD chip active area;
the imaging size refers to the size of a light spot emitted from the collection lens group (500), and the size of the light spot is less than the size of the effective area of the CCD chip.
6. The porous fluorescent ceramic porosity detection device according to claim 1, wherein a shading component is arranged between the relay lens (300) and the detection position (400) to shade at least part of incident light;
and/or a shading component is arranged between the detection position (400) and the collection lens group (500) and is used for shading at least part of emergent light.
7. The method for detecting the porosity detection device of the porous fluorescent ceramic according to any one of claims 1 to 6, comprising the following steps:
step 100: placing standard porous fluorescent ceramic on the detection position, and testing and recording the size of a fluorescent light spot of the standard fluorescent ceramic;
step 200: placing the porous fluorescent ceramic to be tested on the detection position, and testing and recording the size of the fluorescent light spot of the standard fluorescent ceramic;
step 300: and comparing the size of the fluorescent light spot of the standard fluorescent ceramic with the size of the fluorescent light spot of the fluorescent ceramic to be detected, wherein the porosity of the fluorescent ceramic to be detected is qualified when the conditions are met.
8. The detection method according to claim 7, wherein the conditions in step 300 are: the ratio of the size of the fluorescent light spot of the ceramic to be detected to the size of the fluorescent light spot of the standard ceramic is within 1 +/-0.05;
or the difference value of the subtraction of the light spot of the standard fluorescent ceramic and the light spot of the fluorescent ceramic to be detected is within the range of +/-0.05 unit area.
9. The assay of claim 7, wherein the standard porous fluorescent ceramic has a porosity of 3%.
10. The method of claim 9, wherein the standard fluorescent ceramic is the same size as the fluorescent ceramic to be tested.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810177665.8A CN110231265B (en) | 2018-03-05 | 2018-03-05 | Porous fluorescent ceramic porosity detection device and detection method thereof |
| PCT/CN2018/095489 WO2019169817A1 (en) | 2018-03-05 | 2018-07-12 | Device and method for detecting porosity of porous fluorescent ceramic |
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| CN201810177665.8A CN110231265B (en) | 2018-03-05 | 2018-03-05 | Porous fluorescent ceramic porosity detection device and detection method thereof |
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