CN115308164B - Device and method for continuously measuring refractive index and dispersion of molten glass in online real time manner - Google Patents
Device and method for continuously measuring refractive index and dispersion of molten glass in online real time manner Download PDFInfo
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- CN115308164B CN115308164B CN202211239565.6A CN202211239565A CN115308164B CN 115308164 B CN115308164 B CN 115308164B CN 202211239565 A CN202211239565 A CN 202211239565A CN 115308164 B CN115308164 B CN 115308164B
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Abstract
The invention relates to the technical field of glass refractive index measurement, and provides a device and a method for continuously measuring the refractive index and dispersion of molten glass in real time on line. The device and the method for continuously measuring the refractive index and the dispersion of the molten glass in an online real-time manner provided by the invention adopt a static measurement manner, the whole device does not have any mechanical motion when the test laser with the same wavelength is adopted for testing, the whole testing process can be automatically completed and the refractive index of a sample to be measured can be automatically calculated, manual operation is not needed, the refractive index of the sample to be measured can be continuously measured in an online real-time manner, and the testing process is more efficient and has higher reliability. Compared with the existing testing method, the method has the advantages that the adopted sample to be measured is in a molten state, so that the precision processing and annealing treatment are not required, meanwhile, auxiliary instruments with higher cost such as a V-prism refractometer and the like are not required for testing, and the measuring range of the refractive index is wider.
Description
Technical Field
The invention relates to the technical field of light refraction measurement, in particular to the technical field of light refractive index measurement in glass, and particularly relates to a device and a method for continuously measuring the refractive index and the chromatic dispersion of molten glass in real time on line.
Background
The refractive index is one of the most main control indexes in the production process of optical glass (the essence of dispersion measurement is refractive index measurement), at present, the method for testing the refractive index of the optical glass generally samples on formed solid glass, processes the sample into a high-precision right angle after annealing treatment, and finally tests through a V-prism refractometer, and the method for testing the refractive index of the optical glass at least has the following defects:
1. the sample must be a transparent solid and can only be sampled after molding, and for other samples, it needs to be melted and poured again into a solid;
2. the sample must be annealed, resulting in a complex testing process;
3. the sample must be precisely processed, the sample is usually processed into a right angle, the processing difficulty is high, and the cost for precisely testing the right angle of the sample is also high;
4.V prism refractometer needs to use refraction liquid to fill a gap between a sample and the refractometer during testing so as to reduce the influence of angular deviation of the sample on a test result, and refraction liquid with high refractive index needs to use highly toxic chemicals during configuration and is difficult to implement, the refractive index of the refraction liquid commonly used in the industry at present is below 1.80, and large errors are brought when the refraction index testing is carried out on glass with the refractive index of more than 1.80;
5. the whole testing process is complicated, the testing result can be obtained only by consuming time for one day, and the time consumption is long.
Disclosure of Invention
The invention aims to provide a device and a method for continuously measuring the refractive index and the chromatic dispersion of molten glass in real time on line, so as to at least overcome the technical problems of complex test process, larger error and longer test time in the conventional test method for the refractive index of optical glass by adopting a solid sample.
The purpose of the invention is realized by the following technical scheme:
in one aspect, the present invention provides an apparatus for continuously measuring refractive index and dispersion of molten glass in real time on line, comprising:
the laser light source A is used for emitting test laser;
the beam splitter prism C is arranged on a propagation path of the test laser; the beam splitter prism C is used for splitting the test laser into two linearly polarized light beams which are respectively transmitted light P and reflected light S 1 ；
A sample to be measured, said sample to be measured being in molten state and being placed in a container D, said reflected light S 1 Can be incident on the surface of a sample to be measured at a certain incident angleAnd form a reflected light S 2 ；
A photodetector E disposed on a propagation path of the transmitted light P; the photoelectric detector E is used for detecting the light intensity of the transmitted light P;
a photodetector F disposed on the reflected light S 2 On the propagation path of (c); the photodetector F is used for detecting the reflected light S 2 Of the light intensity of (c).
In some possible embodiments, the test laser is a monochromatic laser of any one of red, green and blue or a white laser compounded by three colors of red, green and blue;
the device also comprises a filtering component B, wherein the filtering component B is arranged on the propagation path of the test laser and is positioned between the laser light source A and the beam splitter prism C, and the filtering component B is used for allowing only the laser of one of red, green and blue colors to penetrate.
In some possible embodiments, the filtering component B includes three fan-shaped filters and a steering engine M, the three fan-shaped filters are combined to form a filtering disc, and the filtering disc is disposed at an output end of the steering engine M to drive the filtering disc to rotate through the steering engine M.
In some possible embodiments, the device further includes a computer G, and the laser light source a, the photodetector E, the photodetector F, and the steering engine M are all in communication connection with the computer G.
In some possible embodiments, the apparatus further includes a black box H, the laser light source a, the filtering component B, the beam splitter prism C, the photodetector E, and the photodetector F are all disposed in the black box H, and an inner wall of the black box H is an anti-reflection black frosted surface.
In some possible embodiments, the container D is a crucible, and the top cover of the crucible is provided with a light source for reflecting light S 1 And reflected light S 2 A hole therethrough.
In some possible embodiments, the splitting ratio of the splitting prism C is 6/4 or 5/5.
On the other hand, the invention provides a method for continuously measuring the refractive index and the dispersion of the molten glass in real time on line, and the device for continuously measuring the refractive index and the dispersion of the molten glass in real time on line comprises the following steps:
s10, placing the sample to be measured in a container D, emitting a test laser by using the laser light source A, splitting the test laser through the light splitting prism C into two linearly polarized light beams, wherein the two linearly polarized light beams are respectively transmitted light P and reflected light S 1 ；
Step S20, making the reflected light S 1 At a certain incident angle theta 1 Incident on the surface of the sample to be measured, said reflected light S 1 Reflected light S is formed after reflection 2 ；
S30, detecting the light intensity I of the transmitted light P by using the photoelectric detector E E Detecting the reflected light S by the photodetector F 2 Light intensity of F ；
Step S40. Based on the reflected light S 1 Angle of incidence theta 1 Light intensity I of transmitted light P E And reflected light S 2 Light intensity of (I) F Calculating to obtain the refractive index n of the sample to be measured 2 Refractive index n 2 The calculation expression of (a) is:
in the formula (I), the compound is shown in the specification,
and alpha is the splitting ratio of the splitting prism C. In some possible embodiments, step S40 further includes reflecting the reflected light S 1 Angle of incidence theta 1 Performing calibration to calibrate the reflected light S 1 Angle of incidence theta 1 The process comprises the following steps:
step S41, known refractive index n 2 The liquid sample was placed in a container D, and a test laser was emitted from the laser light source A, the test laser was split by the beam splitter C into two linearly polarized light beams, which were respectively transmitted light P' and reflected light S １ ＇；
S42, enabling the reflected light S １ At a certain angle of incidence theta 1 Incident on a known refractive index n 2 ' of the surface of the liquid sample, the reflected light S １ ' after reflection form a reflected light S ２ ＇；
S43, detecting the light intensity I of the transmission light P' by using the photoelectric detector E E Detecting the reflected light S with the photodetector F ２ Light intensity I of F ＇；
S44, deducing an incidence angle theta according to a Fresnel formula, a refraction law formula and a relation between light intensity and electric field intensity 1 And according to the incident angle theta 1 Calculation expression of (2) calculating the incident angle theta 1 (ii) a Wherein the incident angle theta 1 The calculation expression of (a) is:
in the formula (I), the compound is shown in the specification,
and alpha is the splitting ratio of the splitting prism C.
In some possible embodiments, the method further comprises the step of:
and S50, respectively measuring the refractive indexes of the sample to be measured under the action of the red, green and blue lasers, and obtaining the dispersion value of the sample to be measured according to the refractive indexes of the sample to be measured under the action of the lasers with different colors.
The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects:
the device and the method for continuously measuring the refractive index and the dispersion of the molten glass in an online real-time manner provided by the invention adopt a static measurement manner, the whole device does not have any mechanical motion when the test laser with the same wavelength is adopted for testing, the whole testing process can be automatically completed and the refractive index of a sample to be measured can be automatically calculated, manual operation is not needed, the refractive index of the sample to be measured can be continuously measured in an online real-time manner, and the testing process is more efficient and has higher reliability.
Secondly, only light in one polarization direction is used for testing in the testing process, the refractive index is calculated by synchronously measuring the light intensity of incident light and the light intensity of emergent light, the logic is simpler, the introduced variables are fewer, and the calculation result is more accurate. Meanwhile, in the test process, no hard requirement is made on the incident angle, a calibration method of the incident angle is provided, automatic switching of multicolor test laser can be realized, and the test of refractive index and dispersion can be carried out.
Compared with the existing testing method, the invention has the advantages that the adopted sample to be measured is in a molten state, so that the precision processing and annealing treatment are not needed, and simultaneously, auxiliary instruments with higher cost such as a V-prism refractometer and the like are not needed for testing, and the measuring range of the refractive index is wider.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for continuously measuring refractive index and dispersion of molten glass in real time on line according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a filter assembly B according to an embodiment of the present invention.
Icon: 10-a laser light source A, 20-a filtering component B, 21-a fan-shaped filter, 22-a steering engine M, 30-a beam splitter prism C, 40-a container D, 50-a photoelectric detector E, 60-a photoelectric detector F, 70-a computer G and 80-a black box H.
Detailed Description
Referring to fig. 1, the present embodiment provides a device for continuously measuring refractive index and dispersion of molten glass in real time on line, so as to at least overcome the technical problems of complex test process, large error and long test time in the conventional method for measuring refractive index of optical glass by using a solid sample. Specifically, the device comprises a laser light source A10, a filter assembly B20, a beam splitter prism C30, a container D40, a photodetector E50, a photodetector F60, a computer G70 and a black box H80.
In the present embodiment, the laser light source a10 is used to emit a test laser with a certain wavelength to facilitate the subsequent refractive index test. It can be understood that the test laser emitted by the laser light source a10 may be a monochromatic laser of any color of red, green and blue, or a white laser of a composite of three colors of red, green and blue, but in the subsequent single refractive index test process, it should be ensured that only the laser of one color of the three colors of red, green and blue is used as the incident light, so as to test the refractive index of the sample to be measured under the action of the laser of a certain color.
In this embodiment, the filter element B20 is disposed on the propagation path of the test laser, and the filter element B20 is configured to allow only one of red, green and blue laser to pass through, that is, when the test laser emitted by the laser light source a10 is a white laser formed by combining red, green and blue laser, the filter element B20 only allows one of red, green and blue laser to pass through.
Specifically, referring to fig. 2, the filter assembly B20 includes, but is not limited to, three fan-shaped filters 21 and a steering engine M22, wherein angles of the three fan-shaped filters 21 are all 120 °, and the three fan-shaped filters 21 are respectively used for allowing laser light of one of three colors, red, green and blue to pass through, at this time, the three fan-shaped filters 21 are combined to form a circular filter disc, and the filter disc is installed at an output end of the steering engine M22 to drive the filter disc to rotate through the steering engine M22, so that one of the fan-shaped filters 21 in the filter disc is located on a transmission path of test laser light in a test process, thereby retaining the laser light of a color required by the test and filtering laser light of other colors. For example, when red laser is required to be used as the test laser, the steering engine M22 drives the filter disc to rotate, so that the fan-shaped filter 21 allowing the red laser to pass through in the filter disc rotates to the propagation path of the test laser; when green laser is required to be used as test laser, the steering engine M22 drives the filter disc to rotate, so that the fan-shaped filter 21 allowing the green laser to penetrate through the filter disc rotates to the transmission path of the test laser, and so on.
In the present embodiment, the beam splitter C30 is also disposed on the propagation path of the test laser, in this case, the filter assembly B20 is disposed between the laser light source a10 and the beam splitter C30, and the beam splitter C30 is used for splitting the test laser of a single color transmitted through the filter assembly B20 into two linearly polarized light beams, that is, the test laser of a single color transmitted through the filter assembly B20 is incident on the beam splitter at the vertical incidence plane thereofWhen the prism C30 is used, the emergent light is divided into two linearly polarized light beams which are respectively transmitted light P and reflected light S 1 It can be understood that the reflected light S 1 And simultaneously, the light is used as the incident light of a sample to be measured in the subsequent testing process.
It should be noted that, under the condition that the incident angle of the test laser incident on the light splitting prism C30 is not changed, the light splitting ratio of the light splitting prism C30 needs to be fixed, the light splitting ratio can be measured in advance before the test, so as to facilitate the subsequent calculation of the refractive index, and once the light splitting ratio of the light splitting prism C30 is measured, the measured light splitting ratio is used as a fixed parameter of the device, and is not adjusted subsequently. To prevent light intensity errors from being amplified while ensuring reflected light S 1 It should not be too weak, and the splitting ratio of the splitting prism C30 in the present embodiment is preferably 6/4 or 5/5.
In the present embodiment, the container D40 is used for accommodating the sample to be measured, and when the test is performed, the sample to be measured is in a molten state and is placed in the container D40, and the container D40 is located in the reflected light S 1 So that the reflected light S is reflected 1 Can be incident on the surface of the sample to be measured at a certain incident angle, the reflected light S 1 Emission takes place at the surface of the sample to be measured to form reflected light S 2 。
It is understood that the container D40 in this embodiment may be in various forms, such as a crucible or a liquid bath in a continuous glass production process, etc. When the crucible is used as the container D40, the top cover of the crucible needs to be provided with a light source S for reflecting light 1 And reflected light S 2 The crucible has a heating function at the same time, so that when the sample placed in the container D40 is solid, the sample can be directly heated to the required temperature by using the crucible and becomes a melt; accordingly, when the liquid tank is used as the container D40, since the sample flowing in the liquid tank is itself a melt, it is only necessary to make the melt sample flow slowly in the liquid tank.
It should be noted that, in the actual test, the reflected light S is reflected 1 Incident as incident light on the surface of the sample to be measured in the container D40The size is not mandatory, the larger the incident angle is, the reflected light S 2 The stronger the angle, the more advantageous the test, but limited to the influence of the structure of the container D40 itself (e.g. the crucible edge of the crucible, etc.), the larger the angle of incidence can not be taken, generally about 45 °, and once the angle of incidence is determined, all the components in the whole apparatus are fixed, and there will be a method to precisely calibrate the angle value of the angle of incidence, so as to realize the calibrated angle of incidence as one of the parameters for the subsequent calculation of the conversion rate, which will be explained in detail in the subsequent steps. At the same time, based on the reflected light S as incident light 1 Already linearly polarized light with the vibration direction S reflects the light S according to the Fresnel formula 2 And is also necessarily S light.
In the present embodiment, the photo detector E50 is disposed on the propagation path of the transmitted light P to detect the light intensity of the transmitted light P by the photo detector E50, and the photo detector F60 is disposed on the reflected light S 2 To detect the reflected light S by the photodetector F60 2 The light intensity of (c). It is understood that the light intensities detected by the photodetectors E50 and F60 serve as one of the parameters for the subsequent calculation of the refractive index.
It should be noted that, the sensitivity of the used photodetector E50 and photodetector F60 is related to the light intensity of the test laser that can be emitted by the laser light source a10, and under the condition that the accuracy requirement on the test result is not changed, the ratio of the light intensity of the incident light to the light intensity of the reflected light is needed when the refractive index is finally calculated, so the stronger the light source is, the lower the requirement on the sensitivity of the detector is. By evaluating the luminous intensity of the laser light source A10 and the sensitivities of the photodetector E50 and the photodetector F60, assuming that the light splitting ratio is 1:1, when the total light intensity emitted by the laser light source A10 is 100mW, the deviation of the light intensity detected by the photodetector F60 is 0.0001mW, and the deviation of the refractive index test result is 1 × 10 -5 And otherwise at substantially the same level. Therefore, to achieve 1 × 10 -5 The laser light source A10 and the photodetectors E50 and F60 may be selected, for example, 100mW of the laser light source A10, the photodetectors E50 and the photodetectors F60The precision of the device F60 is higher than 0.1 muW; the accuracy of the 1000mW laser light source A10, the photodetector E50 and the photodetector F60 is higher than 1 muW.
In this embodiment, the computer G70 is configured to control the laser light source a10 to start, switch the test laser color, switch the fan filter 21, and collect light intensity data, and calculate the refractive index of the sample to be measured according to a calculation formula to be displayed on a corresponding display device, that is, the laser light source a10, the photodetector E50, the photodetector F60, and the steering engine M22 are all in communication connection with the computer G70, so as to control the laser light source a10 and the steering engine M22 to operate through the computer G70, and collect light intensity data detected by the photodetector E50 and the photodetector F60.
In this embodiment, the inner wall of the black box H80 is an anti-reflection black frosted surface to reduce the interference light existing during the test as much as possible by arranging the black box H80, and at this time, the black box H80 should be provided with the reflected light S 1 And reflected light S 2 A hole through which the reflected light S passes 1 Can be emitted from the black box H80 and incident on the surface of the sample to be measured in the container D40, and the reflected light S formed after reflection is made 2 Can be re-injected into the black box H80, thereby facilitating the detection of the reflected light S by the photodetector F60 2 The light intensity of (c). Meanwhile, except for the container D40 and the computer G70, other components in the whole device are arranged in the black box H80, namely the laser light source A10, the filter component B20, the beam splitter prism C30, the photoelectric detector E50 and the photoelectric detector F60 are arranged in the black box H80, and meanwhile, the surfaces of corresponding devices in the black box H80 are also anti-reflection black frosted surfaces, so that the influence of interference light on a test result is further reduced, and the test precision is improved.
On the other hand, the embodiment provides a method for continuously measuring the refractive index and the dispersion of the molten glass in an online real-time manner, which adopts the above-mentioned device for continuously measuring the refractive index and the dispersion of the molten glass in an online real-time manner, and the method comprises the following steps:
s10, placing a sample to be measured in a container D40, and emitting test laser by using a laser light source A10 to test the laserThe laser beam passes through the filter assembly B20 and is incident on the beam splitter prism C30, at this time, the test laser beam is split by the beam splitter prism C30 and is divided into two linearly polarized light beams, and the two linearly polarized light beams are respectively transmitted light P and reflected light S 1 ；
Step S20, making the reflected light S 1 As incident light and at a certain incident angle theta 1 Incident on the surface of the sample to be measured in the container D40, reflects the light S 1 Reflected light S is formed after reflection 2 ；
Step S30, detecting the light intensity I of the transmitted light P by using the photoelectric detector E50 E Detecting the reflected light S by using a photodetector F60 2 Light intensity of F ；
Step S40. Based on reflected light S 1 Angle of incidence theta 1 Light intensity I of transmitted light P E And reflected light S 2 Light intensity of F Calculating to obtain the refractive index n of the sample to be measured 2 Refractive index n 2 The calculation expression of (a) is:
in the formula (I), the compound is shown in the specification,
and α is the spectral ratio of the spectral prism C30.
It will be appreciated that in step S40, the reflected light S of different colours is based on the device being stationary 1 Incident angle theta when incident on the surface of a sample to be measured 1 Does not change and therefore a corresponding calibration method can be used to calibrate the reflected light S 1 Angle of incidence theta 1 So as to further improve the accuracy of the test result. Specifically, the collimated reflected light S 1 Angle of incidence theta 1 The process of (2) comprises:
step S41, known refractive index n 2 The liquid sample was placed in the container D40, and the test laser light was emitted from the laser light source a10, transmitted through the filter element B20, and then incident on the beam splitter prism C30, at which time the test laser light was split into two linearly polarized light beams by the beam splitter prism C30, and the two linearly polarized light beams were transmitted light beams respectivelyP' and reflected light S １ '; it should be noted that the wavelength of the test laser used herein should be the same as the wavelength of the test laser used when the refractive index test of the sample to be measured is performed, and for example, the wavelength may be He — Ne line having a wavelength of 632.8 nm;
step S42, making the reflected light S １ As incident light and at a certain angle of incidence θ 1 Incident on a known refractive index n 2 ' the surface of the liquid sample, reflecting light S １ After reflection, form a reflected light S ２ ＇；
Step S43, detecting the light intensity I of the transmitted light P' by using the photoelectric detector E50 E ', detecting the reflected light S by means of a photoelectric detector F60 ２ Light intensity I of F ＇；
S44, deducing an incidence angle theta according to a Fresnel formula, a refraction law formula and a relation between light intensity and electric field intensity 1 And according to the incident angle theta 1 Calculating the incident angle theta 1 (ii) a Wherein the incident angle theta 1 The calculation expression of (a) is:
in the formula (I), the compound is shown in the specification,
and α is the spectral ratio of the spectral prism C30.
Specifically, in step S44, the incident angle θ 1 The calculation expression of (2) is derived as follows:
as is known, the fresnel formula is expressed as:
；
in the formula, r s Is the amplitude (i.e. electric field intensity E) reflection coefficient of S light, E 1 Is the intensity of the reflected light field, E is the intensity of the incident light field, θ 1 And theta 2 Respectively representing an incident angle and a refraction angle; the negative sign on the right of the equal sign indicates that the vibration direction is opposite and can be removed when calculating the absolute value.
The law of refraction is expressed as:
；
in the formula, n 1 And n 2 Respectively represent the refractive indexes of the media in the incident direction and the refraction direction, and under the condition of the embodiment, the medium in the incident direction is air, so n 1 =1，n 2 Refractive index, θ, of the sample to be measured 1 And theta 2 Again representing the angle of incidence and angle of refraction, respectively.
The relationship between the intensity of light and the intensity of electric field is expressed as:
；
first, the splitting ratio α based on the splitting prism C30 = the luminous intensity of reflected light/the luminous intensity of transmitted light, and therefore, the luminous intensity of reflected light = the luminous intensity of transmitted light at the splitting ratio α ×, that is, the reflected light S in the present embodiment １ Intensity of light =
；
Meanwhile, the reflected light S in the present embodiment ２ ' intensity of electric field and reflected light S 1 The ratio of the electric field strengths of':
at this time, the process of the present invention,
order:
by removing the minus sign representing the vibration direction in the formula (1) and combining the formula (1) and the formula (3), it is possible to obtain:
the finishing is simplified to obtain:
secondly, order:
combining the formula (2) and the formula (6) and eliminating the refraction angle theta 2 And simplifying and finishing the steps:
at this time, the light intensity I of the transmitted light P' is based on the spectral ratio alpha E ' reflected light S ２ Light intensity I of F And refractive index n 2 All parameters are known, so the reflected light S of the device in the current state can be calculated by equation (8) １ Angle of incidence theta 1 Then realize the reflected light S １ Angle of incidence theta 1 And (6) carrying out calibration. Meanwhile, because the device is kept still in the subsequent test process, the reflected light S is reflected when the sample to be measured is tested １ Will be at the same incident angle theta 1 Incident on the surface of the sample to be measured.
At the same time, the refractive index n of the sample to be measured is calculated in the above step S40 2 Is also converted from the formula (8), and at this time, the light intensity I of the transmitted light P is based on the light splitting ratio alpha E Reflected light S 2 Light intensity of F And angle of incidence theta 1 All the parameters are known, so that the refractive index n of the sample to be measured under the action of the test laser with the current color can be directly calculated 2 。
It should be noted that, in the actual test process, the refractive index n of the sample to be measured should be repeatedly measured several times 2 And averaged to eliminate random errors. At the same time, the above-mentioned angle of incidence θ is calculated 1 And a refractive index n 2 All can be completed in the computer G70.
Specifically, the incidence angle θ is calculated in the computer G70 1 The core code of (a) is:
calculating the refractive index n in the computer G70 2 The core code of (a) is:
so far, the computer G70 can be used for realizing the on-line real-time continuous measurement of the refractive index n of the sample to be measured under the action of the test laser with different colors 2 。
Furthermore, in order to achieve the measurement of the dispersion value of the sample to be measured, the above method further comprises the steps of:
s50, refractive indexes of the sample to be measured under the action of the red, green and blue lasers are measured respectively, and the dispersion value of the sample to be measured can be obtained according to the refractive indexes of the sample to be measured under the action of the lasers with different colors. That is, the computer G70 controls the laser light source a10 to sequentially emit red, green and blue lasers as the test laser to obtain the refractive index n of the sample to be measured under the action of the red laser, the green laser and the blue laser Red (Red) 、n Green And n Blue (B) According to n Red wine 、n Green And n Blue (B) And obtaining the dispersion value of the sample to be measured.
Therefore, the device and the method for continuously measuring the refractive index and the dispersion of the molten glass in real time on line provided by the embodiment adopt a static measurement mode, the whole device can finish the test without any mechanical movement when the test laser with the same wavelength is adopted for testing, the whole testing process can be automatically finished, the refractive index of the sample to be measured can be automatically calculated by a computer G70, manual operation is not needed, the refractive index of the sample to be measured can be continuously measured in real time on line, the testing process is more efficient, and the reliability is higher.
Secondly, only light in one polarization direction is used for testing in the testing process, the refractive index is calculated by synchronously measuring the light intensity of incident light and the light intensity of emergent light, the logic is simpler, the introduced variables are fewer, and the calculation result is more accurate. Meanwhile, no hard requirement is made on the incident angle in the test process, a calibration method of the incident angle is also provided, automatic switching of the multi-color test laser can be realized, and the test of the refractive index and the dispersion can also be carried out.
Compared with the existing testing method, the sample to be measured adopted in the embodiment is in a molten state, so that precision processing and annealing treatment are not needed, and meanwhile, auxiliary instruments with higher cost such as a V-prism refractometer and the like are not needed for testing, and the measuring range of the refractive index is wider.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A method for continuously measuring the refractive index and the dispersion of molten glass in real time on line, which adopts a device for continuously measuring the refractive index and the dispersion of the molten glass in real time on line, and the device comprises:
the laser light source A is used for emitting test laser;
the beam splitter prism C is arranged on a propagation path of the test laser; the beam splitter prism C is used for splitting the test laser into two linearly polarized light beams which are respectively transmitted light P and reflected light S 1 ；
A sample to be measured, said sample to be measured being in molten state and being placed in a container D, said reflected light S 1 Can be incident on the surface of a sample to be measured at a certain incident angle and forms reflected light S 2 ；
A photodetector E disposed on a propagation path of the transmitted light P; the photoelectric detector E is used for detecting the light intensity of the transmitted light P;
a photodetector F disposed on the reflected light S 2 On the propagation path of (c); the photodetector F is used for detecting the reflected light S 2 The light intensity of (a);
characterized in that the method comprises the following steps:
step S10, placing the sample to be measured in a container D, emitting a test laser by using the laser light source A, splitting the test laser into two linearly polarized light beams after being split by the light splitting prism C, wherein the two linearly polarized light beams are respectively transmitted light P and reflected light S 1 ；
Step S20, making the reflected light S 1 At a certain incident angle theta 1 Incident on the surface of the sample to be measured, said reflected light S 1 Reflected light S is formed after reflection 2 ；
Step S30, detecting the light intensity I of the transmitted light P by using the photoelectric detector E E Detecting the reflected light S by the photodetector F 2 Light intensity of F ；
Step S40, based on the reflected light S 1 Angle of incidence theta 1 Light intensity I of transmitted light P E And reflected light S 2 Light intensity of F Calculating to obtain the refractive index n of the sample to be measured 2 Refractive index n 2 The calculation expression of (a) is:
in the formula (I), the compound is shown in the specification,
and alpha is the splitting ratio of the splitting prism C.
2. The method for on-line real-time continuous measurement of refractive index and dispersion of molten glass according to claim 1, wherein step S40 further comprises measuring said reflected light S 1 Angle of incidence theta 1 Performing calibration to calibrate the reflected light S 1 Angle of incidence theta 1 The process of (2) comprises:
step S41, known refractive index n 2 The liquid sample was placed in a container D, and a test laser was emitted from the laser light source A, the test laser was split by the beam splitter C into two linearly polarized light beams, which were respectively transmitted light P' and reflected light S 1 ＇；
Step S42, making the reflected light S 1 At a certain angle of incidence theta 1 Incident on a known refractive index n 2 ' of the surface of the liquid sample, the reflected light S 1 After reflection, form a reflected light S ２ ＇；
S43, detecting the light intensity I of the transmitted light P' by using the photoelectric detector E E Detecting the reflected light S with the photodetector F ２ Luminous intensity of F ＇；
Step S44, deducing an incident angle theta according to the Fresnel formula, the law of refraction formula and the relation between the light intensity and the electric field intensity 1 And according to the incident angle theta 1 Calculating the incident angle theta 1 (ii) a Wherein the incident angle theta 1 The calculation expression of (a) is:
in the formula (I), the compound is shown in the specification,
and alpha is the splitting ratio of the splitting prism C.
3. The method of claim 1, wherein said method further comprises the steps of:
and S50, respectively measuring the refractive indexes of the sample to be measured under the action of the red, green and blue laser, and obtaining the dispersion value of the sample to be measured according to the refractive indexes of the sample to be measured under the action of the laser with different colors.
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