CN112033648B - Cut-off depth detection method of optical filter - Google Patents
Cut-off depth detection method of optical filter Download PDFInfo
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- CN112033648B CN112033648B CN202010948447.7A CN202010948447A CN112033648B CN 112033648 B CN112033648 B CN 112033648B CN 202010948447 A CN202010948447 A CN 202010948447A CN 112033648 B CN112033648 B CN 112033648B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
Abstract
The invention relates to a cut-off depth detection method of an optical filter, which comprises a light source, wherein light beams emitted by the light source penetrate through the optical filter to be detected, and then are received and displayed by spectral intensity detection equipment for primary detection; placing a high-concentration solution between the optical filter to be detected and the spectral intensity detection equipment, so that light beams emitted by the light source penetrate through the optical filter to be detected, penetrate through the high-concentration solution, and are received and displayed by the spectral intensity detection equipment for re-detection of spectral intensity; and comparing the re-measured spectral intensity with the initial measured spectral intensity, observing whether the specific wavelength with the obviously different spectral intensity exists, and if the specific wavelength with the obviously different spectral intensity exists, judging that the transmittance of the optical filter to be measured on the specific wavelength has a problem. The invention adopts a contrast mode, can conveniently and quickly find out the absorption problem of the optical filter on specific wavelengths, can carry out analysis and improvement more specifically after the specific wavelengths are determined, and guides the design and manufacture of the optical filter with more perfect and high quality.
Description
Technical Field
The invention belongs to the technical field of optical property testing in physical testing, and particularly relates to a cut-off depth detection method of an optical filter.
Background
Optical filters are commonly used optical devices for selecting a desired radiation band, and are widely used in optical devices, such as cameras, video cameras, and the like. The cut-off depth is one of the determination parameters of the quality of the filter, and the larger the cut-off depth OD of the filter is, the smaller the transmittance is, the smaller the noise is, the greater the difficulty of the corresponding design and manufacture is, the higher the requirement is, and the higher the price is.
Regarding the detection of the filter cut-off depth, the test method as disclosed in CN 103616163 a; in ordinary project experiments, a hamamatsu spectrometer and supporting software thereof are more commonly used, and when the hamamatsu spectrometer is used, a detection signal is transmitted to a terminal (usually a computer) provided with the supporting software, and a detection result value is displayed through the terminal after the calculation processing of the supporting software.
However, in the experimental items using the filters, the characteristic curves of the transmission filters may be different due to the advantages and disadvantages of the filters, such as: some filters need to absorb at specific wavelength, but have certain low light leakage (high transmittance); however, the existing method for detecting the cut-off depth of the optical filter is inconvenient to find the absorption problem (large transmittance) of the optical filter to a certain or some (non-designed passing) specific wavelengths caused by the self-structure reason (such as design loss or manufacturing problem), is inconvenient to guide the design of a more perfect optical filter, and is inconvenient to feed back and improve the quality of the optical filter.
Disclosure of Invention
In view of the above disadvantages in the prior art, the technical problem to be solved by the present invention is to provide a method for detecting the cut-off depth of an optical filter, so as to avoid the problem of inconvenient detection of the transmittance of the optical filter for certain specific wavelengths, and to obtain the effect of conveniently finding out which specific wavelengths have absorption problems, thereby achieving the effect of conveniently judging and feeding back to improve the quality.
In order to solve the technical problems, the invention adopts the following technical scheme:
the cut-off depth detection method of the optical filter comprises a light source, wherein light beams emitted by the light source penetrate through the optical filter to be detected, and then are received by spectral intensity detection equipment and display the primarily detected spectral intensity; placing a high-concentration solution between the optical filter to be detected and the spectral intensity detection equipment, so that light beams emitted by the light source penetrate through the optical filter to be detected, penetrate through the high-concentration solution, and are received and displayed by the spectral intensity detection equipment for re-detection of spectral intensity; and comparing the re-measured spectral intensity with the initial measured spectral intensity, observing whether the specific wavelength with the obviously different spectral intensity exists, and if the specific wavelength with the obviously different spectral intensity exists, judging that the transmittance of the optical filter to be measured on the specific wavelength has a problem.
Further perfecting the technical scheme, the concentration of the high-concentration solution is more than 30mg/l, and the solution components comprise sodium oxalate, potassium permanganate, potassium hydrogen phthalate and/or ammonia nitrogen solution.
Further, the spectral intensity is significantly different in that there is a significant increase in the spectral intensity of the re-measured spectrum compared to the initial measured spectrum.
Further, the optical filter to be detected and the high-concentration solution are placed in a self-contained detection device, the self-contained detection device comprises a box body, an optical filter clamp is arranged in the box body and used for detachably clamping the optical filter to be detected, the optical filter to be detected is clamped and fixed on the optical filter clamp, a cuvette is arranged in the box body, the high-concentration solution is contained in the cuvette, two opposite side walls of the box body are respectively provided with a light inlet and a light outlet, and the light inlet and the light outlet are respectively provided with a plano-convex collimating lens; light beams emitted by the light source are incident from the convex surface of the collimating lens at the light inlet, pass through the optical filter to be detected after being collimated, penetrate through the cuvette and the high-concentration solution in the cuvette, and then are emitted to the spectral intensity detection equipment in parallel from the collimating lens at the light outlet.
Further, the cuvette is detachably fixed in the box body; the upper end of the box body is open and is provided with a shading cover plate; the shading cover plate is a part of the integral detection device and is used for deducting dark noise, so that the experimental result is prevented from being influenced by the dark noise.
Further, the spectral intensity detection device comprises a spectrometer, and the signal of the spectrometer is connected with a computer for processing data.
Furthermore, optical fibers are connected between the light source and the self-contained detection device and between the self-contained detection device and the spectral intensity detection device, and the corresponding light beams are conducted through the corresponding optical fibers.
Compared with the prior art, the invention has the following beneficial effects:
1. the method for detecting the cut-off depth of the optical filter can conveniently and quickly find out the absorption problem of the optical filter on specific wavelengths by adopting a comparison mode, and can be conveniently analyzed and improved in a more targeted manner in the design and manufacturing processes after the specific wavelengths with the problem of the transmittance of the optical filter are determined, so that the more complete and high-quality optical filter is designed and manufactured.
2. In the method for detecting the cut-off depth of the optical filter, the adopted integral detection device is reasonable in design, collimation of light beams emitted by a light source is realized through the collimating lens, so that the energy loss of the light beams is small, the light beams penetrate through the center of the optical filter and then penetrate through the cuvette filled with the solution, all devices used in the whole process are integrated into an integral structure, the center of the optical filter, the receiving end surface of the cuvette and the center of the collimating lens can be effectively ensured to be on the same horizontal line, and the experimental error is reduced to the minimum.
3. According to the method for detecting the cut-off depth of the optical filter, the light beam is emitted from the integral detection device and enters the spectrometer through the optical fiber, the result can be stored and displayed on the mobile terminal, and the real-time and rapid detection requirements of the current detection process are met; in general, the method has the advantages of simple, real-time and quick operation process, small error, low cost, very strong implementability and high applicability.
Drawings
FIG. 1 is a block diagram of a method for detecting the cut-off depth of a filter according to an embodiment;
FIG. 2 is a schematic diagram of a self-contained test device in an exemplary embodiment;
FIG. 3 is a top view of FIG. 2 (with the cover blank removed for ease of illustration);
FIG. 4 is a diagram illustrating the primary measured spectral intensity according to the first embodiment;
FIG. 5 is a diagram showing the intensity of the re-measured spectrum in the first embodiment;
FIG. 6 is a diagram showing the primary spectrum intensity in the second embodiment;
FIG. 7 is a diagram showing the intensity of the re-measured spectrum in the second embodiment;
the device comprises a self-contained detection device 1, a box body 11, an optical filter clamp 12, a cuvette 13, a light inlet 14, a light outlet 15, a light shading cover plate 16, an optical filter to be detected 2 and a solution 3.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Referring to fig. 1 to 3, the method for detecting the cut-off depth of the optical filter of the embodiment includes a conventional test process, that is, a light source is used, and a light beam emitted from the light source passes through the optical filter to be detected, and then is received by a spectral intensity detection device to display the initial spectral intensity; the special point is that, the embodiment adopts a self-contained detection device 1 on the detection light path, the self-contained detection device 1 includes a box body 11, an optical filter clamp 12 is arranged in the box body 11 for detachably clamping an optical filter 2 to be detected, the optical filter 2 to be detected is placed in the box body 11 and is clamped and fixed on the optical filter clamp 12, a cuvette 13 is also arranged in the box body 11, a high-concentration solution 3 is contained in the cuvette 13, two opposite side walls of the box body 11 are respectively provided with an optical inlet 14 and an optical outlet 15, the optical inlet 14 and the optical outlet 15 are respectively provided with a plano-convex collimating lens, the convex surface of the collimating lens at the optical inlet 14 faces the outer side of the box body 11, the convex surface of the collimating lens at the optical outlet 15 faces the inner side of the box body 11, and the center of the optical filter 2 to be detected, the receiving end surface of the cuvette 13 and the center of the collimating lens are on the same horizontal line; light beams emitted by the light source are incident from a convex surface of a collimating lens at a light inlet 14 of the self-contained detection device 1, pass through the optical filter 2 to be detected after being collimated, penetrate through the cuvette 13 and the solution 3 with the sensitive wavelength of the optical filter to be detected in the cuvette 13, are emitted in parallel from the collimating lens at a light outlet 15 to the spectral intensity detection equipment, and the spectral intensity detection equipment receives and displays the spectral intensity to be detected again. The cell 13 is detachably fixed in the box body 11, and when the operation is carried out, the detection device 1 is installed in a whole and used as the experiment process, and the cell 13 (containing the solution 3) can be taken out, so that the spectrum intensity of the initial measurement can be obtained.
Comparing the re-measured spectral intensity with the initially measured spectral intensity, observing whether a specific wavelength with obviously different spectral intensity exists, and if the specific wavelength with obviously different spectral intensity exists, judging that the transmittance of the optical filter to be measured on the specific wavelength has a problem, wherein the problem is caused by the self-structure reason of the optical filter to be measured, so that the quality of the optical filter to be measured can be further judged to be not high; and because the specific wavelength with the problem of the transmittance of the optical filter to be tested is determined by the method, the optical filter with more perfect and high quality is designed and manufactured conveniently and is analyzed and improved in a more targeted manner in the design and manufacturing process. In terms of effect, the method can also be said to be a method for inspecting the quality of the optical filter.
It should be noted that the specific wavelength at which the transmittance of the filter to be measured is detected to have a problem is determined by the structure (defect) of the filter to be measured, and has no correspondence with the solution, but when a high-concentration solution is applied to the optical path, the difference in the spectral intensity at the specific wavelength can be made more obvious when the re-measured spectral intensity is compared with the initial measured spectral intensity. In practice, a high concentration solution is preferred, with a concentration of greater than 30mg/l, and in view of environmental concerns and cost issues, a solution concentration of 30mg/l to 50mg/l is further preferred.
It should be further noted that, after qualitatively determining that there is a problem in transmittance of the filter to be tested at a specific wavelength, there is a definition or quantitative problem that the spectral intensity of the specific wavelength in the criterion has a "significant difference" in the pre-and post-comparison, and this difference is actually a standard quantity of quality inspection, and may be determined according to the quality requirement of the filter by a buyer or a supplier, or even after the method becomes a detection standard, the difference assignment of the standard and the determination of the solution component and the solution concentration allowable fixed value are performed, and in general, the smaller the impermissible difference, the higher the quality requirement of the filter.
Of course, as a common knowledge in the art, a solution is added to the light path, and the solution has a certain absorption to the light intensity, so the light intensity value (spectrum intensity) will be attenuated, including the central wavelength, and the measured spectrum intensity is compared with the initial measured spectrum intensity, and the central wavelength is inevitably significantly attenuated, that is, there is a significant difference in the comparison, which is determined by the manufacturing characteristics of the optical filter itself, and not the "specific wavelength" with a significant difference to be found in the invention, and under the common knowledge that the light intensity should be attenuated, the spectrum intensity indicated by the present invention should be significantly increased as the spectrum intensity, so as to determine the "specific wavelength". Further, the values can also be: and if the specific wavelength with obviously increased spectral intensity exists and the difference of the front and back increases is not less than 50cd, judging that the transmittance of the filter to be measured on the specific wavelength has a problem.
Wherein, the solution components can be: sodium oxalate, potassium permanganate, potassium hydrogen phthalate and/or ammonia nitrogen solution.
Wherein, the upper end of box body adopts open form, like this, makes things convenient for unloading of the light filter that awaits measuring, changes, makes things convenient for getting of cell and solution to put, and of course, the uncovered shading apron that also needs to set in the upper end of box body covers the uncovered upper end in the experimentation, guarantees the implementation of experimentation and the accuracy of experiment.
The spectrum intensity detection device is a spectrometer, the spectrometer is connected with a computer for processing data through a signal, the computer can be further connected with a storage unit and a mobile terminal through a signal, the signal data received by the spectrometer can display spectrum intensity after being processed by the computer, and the computer can upload the data to a cloud (an optional storage unit) for storage and can transmit the data to the mobile terminal (a mobile phone, a notebook computer and the like) for display so as to be shared.
Optical fibers are connected between the light source and the self-contained detection device and between the self-contained detection device and the spectrum intensity detection equipment, light beams emitted by the light source are emitted into the self-contained detection device through the optical fibers, and light beams emitted from the self-contained detection device are conducted into the spectrometer through the optical fibers.
The method for detecting the cut-off depth of the optical filter can conveniently and quickly find out the absorption problem of the optical filter on specific wavelengths by adopting a comparison mode, determines the specific wavelengths with the problems of the transmittance of the optical filter, and can be conveniently analyzed and improved in a more targeted manner in the design and manufacturing processes, thereby designing and manufacturing the optical filter with more perfect and high quality. The integral detection device adopted by the invention is reasonable in design, and realizes collimation of light beams emitted by a light source through the collimating lens, so that the energy loss of the light beams is small, the light beams penetrate through the center of the optical filter and then penetrate through the cuvette filled with the solution, and all devices used in the whole process are integrated into an integral structure, so that the center of the optical filter, the receiving end surface of the cuvette and the center of the collimating lens can be effectively ensured to be on the same horizontal line, and the experimental error is reduced to the minimum; the light beam is emitted from the integral detection device and enters the spectrometer through the optical fiber, and the result can be displayed on the mobile terminal, so that the real-time and rapid detection requirements of the detection process at present are met.
The method for detecting the cut-off depth of the optical filter is simple, real-time and rapid in operation process, small in error and low in cost.
Example one
Light source: the ultraviolet visible LED light source can emit near ultraviolet light beams and visible light beams in a part of wave bands.
Optical fiber: the ultraviolet-resistant quartz optical fiber has a light source wavelength ranging from 200nm to 760nm and a numerical aperture NA = 0.26.
A collimating lens: and the optical fiber collimating mirror is made of ultraviolet fused quartz.
Filter anchor clamps: the adjustable optical filter clamp has an adjustable clamping range of 10-20 mm.
The optical filter to be tested: a 214nm (center wavelength) filter a was measured.
A cuvette: an anti-ultraviolet cuvette.
The components of the solution are as follows: the solvent is water, and the solute is sodium oxalate and potassium permanganate (the content ratio is not limited); concentration of the solution: 30 mg/l.
The cuvette (containing the solution) is taken out first and detected to obtain the initial spectral intensity, which is schematically shown in FIG. 4.
The sample is placed into a cuvette (containing the solution), and the spectral intensity is measured and shown in FIG. 5.
Comparing the re-measured spectrum intensity with the initial measured spectrum intensity, it can be observed that after passing through the high concentration solution, there is absorption at specific wavelength, and it can be observed that the spectrum has obvious absorption peak. If the wavelength with the difference of the increase of the spectral intensity before and after reaching 50cd is determined as the specific wavelength with obvious difference, the transmittance of the filter A to be measured on the specific wavelength of 496-518 nm has a problem and needs to be improved and perfected.
Example two
The equipment and the devices are the same as the first embodiment.
The optical filter to be tested: a546 nm (center wavelength) filter B was tested.
The cuvette (containing the solution) is removed first and the initial spectral intensity is detected, which is schematically shown in FIG. 6.
The sample is placed into a cuvette (containing the solution), and the spectral intensity is measured and shown in FIG. 7.
Comparing the re-measured spectral intensity with the initial measured spectral intensity, determining that the wavelength with the difference of 50cd is increased before and after the spectral intensity is the specific wavelength with obvious difference, and observing and comparing (or comparing by a computer through software), the transmittance of the optical filter B to be measured on each wavelength has no problem and the quality is good.
EXAMPLE III
The equipment and the devices are the same as the first embodiment.
Concentration of the solution: 50 mg/l.
The cuvette (containing the solution) is taken out first and the initial spectral intensity is obtained by detection.
Placing the solution into a cuvette (containing the solution), and detecting to obtain the remeasured spectral intensity.
Comparing the intensity of the re-measured spectrum with the intensity of the original spectrum, a more obvious absorption peak of the spectrum can be observed (the difference is not significant, and the reference to fig. 5 can be used without further illustration). Or the wavelength with the difference of the increase of the spectral intensity before and after reaching 50cd is determined as the specific wavelength with obvious difference, so that the transmittance of the filter A to be measured on the specific wavelength of 496-518 nm still has a problem.
In the existing experimental method, different spectrometers and software can be used to obtain the evidence judged by the invention, such as Shanghai shared spectrometer and matched software.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (6)
1. The cut-off depth detection method of the optical filter comprises a light source, wherein light beams emitted by the light source penetrate through the optical filter to be detected, and then are received by spectral intensity detection equipment and display the primarily detected spectral intensity; the method is characterized in that: placing a high-concentration solution with the sensitive wavelength of the optical filter to be detected between the optical filter to be detected and the spectral intensity detection equipment, so that light beams emitted by a light source penetrate through the optical filter to be detected and then penetrate through the high-concentration solution with the sensitive wavelength of the optical filter to be detected, and then the spectral intensity detection equipment receives and displays the re-detected spectral intensity;
comparing the re-measured spectrum intensity with the initially measured spectrum intensity, observing whether a specific wavelength with obviously different spectrum intensity exists, and if the specific wavelength with obviously different spectrum intensity exists, judging that the transmittance of the optical filter to be measured on the specific wavelength has a problem;
the spectral intensity is significantly different, i.e. there is a significant increase in spectral intensity.
2. The method of detecting the cut-off depth of the optical filter according to claim 1, wherein: the concentration of the high-concentration solution is more than 30mg/l, and the solution components comprise sodium oxalate, potassium permanganate, potassium hydrogen phthalate and/or ammonia nitrogen solution.
3. The method of detecting the cut-off depth of the optical filter according to claim 1, wherein: the optical filter to be detected and the high-concentration solution are arranged in the integrated detection device, the integrated detection device comprises a box body, an optical filter clamp is arranged in the box body and used for detachably clamping the optical filter to be detected, the optical filter to be detected is clamped and fixed on the optical filter clamp, a cuvette is arranged in the box body, the high-concentration solution is contained in the cuvette, two opposite side walls of the box body are respectively provided with a light inlet and a light outlet, and the light inlet and the light outlet are respectively provided with a plano-convex collimating lens;
light beams emitted by the light source are incident from the convex surface of the collimating lens at the light inlet, pass through the optical filter to be detected after being collimated, penetrate through the solution in the cuvette and the cuvette, and then are emitted to the spectral intensity detection equipment in parallel from the collimating lens at the light outlet.
4. The method of detecting the cut-off depth of the optical filter according to claim 3, wherein: the cuvette is detachably fixed in the box body; the upper end of the box body is open and is provided with a shading cover plate.
5. The method of detecting the cut-off depth of the optical filter according to claim 1, wherein: the spectrum intensity detection equipment comprises a spectrometer, and the signal of the spectrometer is connected with a computer for processing data.
6. The method of detecting the cut-off depth of the optical filter according to claim 3, wherein: optical fibers are connected between the light source and the self-contained detection device and between the self-contained detection device and the spectral intensity detection equipment, and corresponding light beams are conducted through the corresponding optical fibers.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1302916A (en) * | 2000-12-27 | 2001-07-11 | 中国科学院上海技术物理研究所 | Method of monitoring and controlling thickness of optical medium film for infrared-stopping filter |
| US20090316144A1 (en) * | 2008-06-20 | 2009-12-24 | Hoya Corporation | Device for detecting the condition of an optical filter and illumination device |
| CN103616163A (en) * | 2013-11-25 | 2014-03-05 | 中国科学院长春光学精密机械与物理研究所 | Solar blind ultraviolet filter out-of-band cut-off depth testing method |
| US9927369B2 (en) * | 2015-06-03 | 2018-03-27 | Materion Corporation | Automated defect detection and mapping for optical filters |
| CN105588708A (en) * | 2015-12-16 | 2016-05-18 | 南京理工大学 | Test system and test method for testing high-precision transmittance of optical filter |
| CN105372042A (en) * | 2015-12-16 | 2016-03-02 | 北方夜视技术股份有限公司 | Optical filter high precision transmittance testing device |
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