CN210293627U - Lens multi-wavelength refractive index detection device - Google Patents
Lens multi-wavelength refractive index detection device Download PDFInfo
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- CN210293627U CN210293627U CN201921497381.3U CN201921497381U CN210293627U CN 210293627 U CN210293627 U CN 210293627U CN 201921497381 U CN201921497381 U CN 201921497381U CN 210293627 U CN210293627 U CN 210293627U
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Abstract
The utility model provides a lens multi-wavelength refractive index detection device which characterized in that: including compound light source subassembly, focus subassembly, beam split subassembly, reference lens, removal lens, first photoelectric detection subassembly, the signal reception subassembly of output collimated light beam, the signal reception subassembly is including being used for separating out the monochromatic light separation subassembly of the monochromatic light of K kinds of different wavelength from the compound light that reflects back and be used for respectively receiving K kinds of monochromatic light interference signal's second photoelectric detection subassembly, third photoelectric detection subassembly … K +1 photoelectric detection subassembly totally K photoelectric detection subassembly, K is greater than or equal to 2. The lens multi-wavelength refractive index detection device is simple to operate, can perform online rapid nondestructive detection, is also suitable for non-regular surface lenses such as aspheric lenses and cylindrical lenses and finished lenses, and can detect refractive indexes at multiple wavelengths.
Description
Technical Field
The utility model relates to an optical lens parameter detection technical field, concretely relates to lens multi-wavelength refracting index detection device.
Background
The refractive index parameter is an important parameter index of the optical lens, and in order to ensure good imaging quality of an optical system, the refractive index of an optical material needs to be accurately measured. At present, the refractive index of an optical glass material is measured with high precision by a minimum deviation angle method, but the minimum deviation angle method is used for detection on the premise that optical glass to be measured needs to be made into a prism for light refraction, and meanwhile, the related angle of the prism needs to be accurately detected. Therefore, the minimum deviation angle method for detecting the refractive index of the optical glass material is a direct detection method, and has the following technical problems: 1. the need to destroy the optical elements, which is not necessarily suitable for inspection of the finished lens; 2. the prism is difficult to manufacture, the period is long, and corresponding prisms are required to be manufactured respectively aiming at optical glass of different batches and different materials, so that the detection efficiency is low; 3. the test uses a prism, so the method is not suitable for detecting the lens with irregular surface such as an aspheric lens, a cylindrical lens and the like. The minimum deviation angle method is relatively suitable for glass manufacturers to detect raw material glass of the same batch, but is not suitable for on-line high-precision detection of finished lenses, for example, refractive index detection of spectacle lenses needs to be realized without knowing the material of an optical element and without damaging the optical element, so as to determine the material property of the spectacle lenses.
At present, the refractive index detection methods for finished lenses mainly comprise 2 methods: one method is to perform reverse calculation according to a focal power formula, namely, a mechanical precision measurement method is used for measuring the front and back surface curvatures, the center thickness and the focal power of the lens, and the wavelength refractive index is calculated according to the focal power formula; another method is to change the "environment" refractive index, i.e. by changing the refractive index of the medium in contact with the front and back surfaces of the lens, such as placing the lens in a solution with a known refractive index, or attaching flexible media with a known refractive index to the front and back surfaces of the lens, the refractive powers of the lens in the air and in the solution are respectively detected, and the refractive index of the lens can be calculated according to the change of the refractive index and the refractive index of the solution. In addition, the conventional refractive index detection device generally detects the refractive index only for one wavelength.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the multi-wavelength refractive index detection device for the lens is simple to operate, can perform online rapid nondestructive detection, is also suitable for non-regular surface lenses such as aspheric lenses and cylindrical lenses and finished lenses, and can detect refractive indexes at multiple wavelengths.
The technical solution of the utility model is that: the utility model provides a lens multi-wavelength refractive index detection device which characterized in that: the device comprises a composite light source component for outputting collimated light beams, a focusing component, a light splitting component, a reference lens, a movable lens, a first photoelectric detection component and a signal receiving component, wherein the first photoelectric detection component, the reference lens, the light splitting component, the focusing component and a composite light source component are sequentially arranged from front to back along a first optical axis direction, a focal plane of the focusing component is positioned between the light splitting component and the reference lens and used for placing the measured lens, the movable lens is arranged on one side of the light splitting component, the signal receiving component is arranged on the other side of the light splitting component, a light beam transmitted by the composite light source component along the first optical axis direction is focused on the measured lens through the focusing component, the focused light beam penetrates through the measured lens and the reference lens and then enters the first photoelectric detection component and is used for correcting the central position of the measured lens, and the light beam transmitted by the composite light source component along the first optical axis direction is further divided into two beams through the light splitting component, one beam of light is projected onto the movable lens and reflected by the movable lens to return in an original path, the other beam of light is projected onto the measured lens and the reference lens and reflected by the upper surface and the lower surface of the measured lens and the upper surface of the reference lens to return in an original path, the returned light beams enter the signal receiving assembly through the light splitting assembly, the signal receiving assembly comprises a monochromatic light separating assembly used for separating K kinds of monochromatic light with different wavelengths from the reflected composite light, and K photoelectric detection assemblies which are K photoelectric detection assemblies in total and are used for respectively receiving K kinds of monochromatic light interference signals, namely a second photoelectric detection assembly and a third photoelectric detection assembly …, namely a K +1 photoelectric detection assembly, and K is more than or equal to 2.
The utility model discloses lens multi-wavelength refracting index detection device theory of operation as follows:
before moving into a measured lens, a light beam transmitted by the composite light source component along the direction of a first optical axis is focused above a reference lens through the focusing component, the focused light beam transmits through the reference lens and enters into the first photoelectric detection component, and the first photoelectric detection component monitors the central position of a light spot of the projected light beam and takes the central position as a reference position for subsequent position adjustment of the measured lens; meanwhile, a light beam transmitted by the composite light source assembly along the direction of the first optical axis is divided into two beams after passing through the light splitting assembly, one beam is projected onto the movable lens and reflected by the movable lens to return to the original path, the other beam is projected onto the reference lens and reflected by the upper surface of the reference lens to return to the original path, the returned light beam enters the signal receiving assembly through the light splitting assembly, the monochromatic light separating assembly separates K monochromatic lights with different wavelengths from the reflected composite light, K photoelectric detection assemblies are used for respectively receiving interference signals of the monochromatic lights, the movable lens is moved, and positions x01 and x02 … x0K of the movable lens when the interference phenomenon is respectively monitored in the K photoelectric detection assemblies, namely the second photoelectric detection assembly and the third photoelectric detection assembly … K +1 photoelectric detection assembly, are recorded; moving the measured lens in, monitoring the actual light spot center position of the projected light beam by a first photoelectric detection component, comparing the actual light spot center position with the reference position obtained before, guiding a user to adjust the position of the measured lens according to the deviation of the actual light spot center position and the reference position, and when the actual light spot center position is superposed with the reference position, superposing the measured lens center with the light path center, namely completing the position adjustment of the measured lens; then readjusting the position of the movable lens, detecting the interference signals of the reflected light of the upper surface of the reference lens and the reflected light of the movable lens in the K +1 photoelectric detection modules of the second photoelectric detection module and the third photoelectric detection module … again, and recording the positions x11 and x12 … x1K of the movable lens when the interference phenomenon is detected in the K photoelectric detection modules respectively; in addition, after the measured lens moves in, the upper and lower surfaces of the measured lens can also generate lightThe reflected light also interferes with the reflected light of the moving lens, so that interference signals of the reflected light of the lower surface of the measured lens and the reflected light of the moving lens in the K +1 photoelectric detection assemblies of the second photoelectric detection assembly and the third photoelectric detection assembly … are detected, the positions x21 and x22 … x2K of the moving lens when the interference phenomena are detected in the K photoelectric detection assemblies respectively are recorded, the interference signals of the reflected light of the upper surface of the measured lens and the reflected light of the moving lens in the K +1 photoelectric detection assemblies of the second photoelectric detection assembly and the third photoelectric detection assembly … are detected, and the positions x31 and x32 … x3K of the moving lens when the interference phenomena are detected in the K photoelectric detection assemblies respectively are recorded; then, the refractive index n1 of the measured lens at the wavelength 1 can be calculated according to x01, x11, x21 and x31, and the calculation formula is as follows:
the refractive index n2 of the tested lens at the wavelength of 2 can be calculated according to x02, x12, x22 and x32, and the calculation formula is as follows:
similarly, the refractive index nk of the measured lens at the wavelength k can be calculated according to x0k, x1k, x2k and x3k, and the calculation formula is as follows:
after the structure is adopted, the utility model has the advantages of it is following:
the utility model discloses lens multi-wavelength refracting index detection device is through detecting interference phenomenon to obtain the relevant parameter of calculation refracting index, need not to make the prism, also need not to detect the relevant angle of prism, and it is more convenient to operate to shortened the detection cycle, can realize online quick detection; the optical element to be detected can not be damaged without manufacturing a prism, so that the method is also very suitable for detecting the finished lens; the detection of the interference phenomenon is also suitable for non-regular surface lenses such as aspheric lenses and cylindrical lenses; in addition, the detection device can detect the refractive indexes of the measured lens at a plurality of wavelengths through the monochromatic light separation component and the corresponding photoelectric detection component.
Preferably, the composite light source assembly comprises a collimating lens, a light hole and a white light source which are sequentially arranged from front to back along the direction of the first optical axis, and the white light source is arranged at the back focus of the collimating lens and is used for enabling light emitted by the white light source through the light hole to be parallel light beams after passing through the collimating lens. The composite light source component has the advantages of simple structure, low cost and safe use, and can be converted into collimated light beams, so that the light path coupling is more reliable.
Preferably, the focusing assembly comprises a focusing lens. The focusing assembly has simple structure and low cost.
Preferably, the light splitting assembly includes a half-transmissive half-reflective first light splitting plate, the center of the movable lens and the center of the first light splitting plate are both located in a second optical axis direction perpendicular to the first optical axis direction, when the movable lens is disposed on the left side of the first light splitting plate, an included angle between the side surface of the first light splitting plate and the second optical axis direction is 45 °, and when the movable lens is disposed on the right side of the first light splitting plate, an included angle between the side surface of the first light splitting plate and the second optical axis direction is 135 °. The light splitting component is simple in structure and low in cost.
Preferably, the reference and moving mirrors have a reflectivity of 1-10%. The arrangement can make the reflectivity of the reference lens and the mobile lens close to the reflectivity of the upper surface and the lower surface of the measured lens, thereby more clearly and accurately detecting the interference phenomenon.
Preferably, the monochromatic light separation assembly comprises K-1 second light splitter, K-1 third light splitter …, K-th light splitter, K first light filter, K-th light filter …, wherein the second light splitter and the K-th light splitter … are semi-transparent and semi-reflective light splitters, the side surfaces of the light splitters form an included angle of 45 degrees or 135 degrees with the second optical axis direction, the first light filter and the K-th light filter … are respectively paired with the second photoelectric detection assembly and the K + 1-th photoelectric detection assembly … to form K groups, the paired light filters and the photoelectric detection assembly are oppositely arranged, the light filters are closer to the reflected light, the second light splitter and the K-th light splitter … are sequentially arranged on one side of the first light splitter from inside to outside in parallel, and the centers of the two light splitters are both located in the second optical axis direction, one group of paired optical filters and photoelectric detection assemblies are arranged on the outer side of the Kth spectroscope on the outermost side, the centers of the optical filters and the photoelectric detection assemblies are also positioned in the second optical axis direction, the other paired optical filters and photoelectric detection assemblies are respectively arranged on the reflection surface sides of the second spectroscope and the Kth spectroscope of the third optical filter …, and the centers of the corresponding optical filters and the photoelectric detection assemblies are both positioned on the reflection lines of the corresponding spectroscopes. The monochromatic light separation component has the advantages of simple structure, reliable light splitting, simple light path and small loss, and is favorable for obtaining accurate measurement results.
Preferably, the monochromatic light separation assembly can separate three monochromatic lights, namely cyan light, yellow light and red light, from the composite light. The arrangement can use the refractive indexes of the three monochromatic lights to obtain the dispersion coefficient of the measured lens.
Preferably, the monochromatic light separation assembly comprises two second light splitting sheets and two third light splitting sheets, and three first light filters, two second light filters and three third light filters, the second light splitting sheets and the third light splitting sheets are semi-transparent semi-reflective light splitting sheets, the side surfaces of the light splitting sheets form an included angle of 45 degrees or 135 degrees with the direction of a second optical axis, the first light filters, the second light filters and the third light filters are respectively cyan light filters, yellow light filters and red light filters and are respectively paired with the second photoelectric detection assembly, the third photoelectric detection assembly and the fourth photoelectric detection assembly into three groups, the paired light filters and photoelectric detection assemblies are oppositely arranged, the light filters are closer to the reflected light, the second light splitting sheets and the third light splitting sheets are sequentially arranged on one side of the first light splitting sheets from inside to outside, the centers of the second optical axis are both positioned on the direction of the second optical axis, one group of the paired light filters and photoelectric detection assemblies are arranged on the outer side of the outermost third light splitting sheets, the centers of the group of optical filters and the photoelectric detection assembly are also positioned in the second optical axis direction, the rest paired optical filters and photoelectric detection assemblies are respectively arranged on the reflecting surface sides of the second light splitter and the third light splitter, and the centers of the corresponding optical filters and the photoelectric detection assemblies are positioned on the reflecting lines of the corresponding light splitters. The dispersion coefficient of the measured lens can be obtained by utilizing the refractive indexes of the three monochromatic lights, and the monochromatic light separation assembly is simple in structure, reliable in light splitting, simple in light path and small in loss, and is beneficial to obtaining an accurate measurement result.
Description of the drawings:
FIG. 1 is an optical schematic diagram of a multi-wavelength refractive index detection device for an ophthalmic lens in example 1;
FIG. 2 is an optical schematic diagram of the multi-wavelength refractive index detection device for lens in example 2;
FIG. 3 is an optical schematic diagram of the multi-wavelength refractive index detection device for lens in example 3;
fig. 4(a) is a reference position of the light spot detected by the first photoelectric detection assembly before moving into the lens to be detected according to the present invention;
fig. 4(b) shows the actual position of the light spot detected by the first photoelectric detection assembly after moving into the lens to be detected;
fig. 4(c) shows the actual position of the light spot detected by the first photoelectric detection assembly after the center position of the lens is adjusted;
in the figure: 1-composite light source component, 2-focusing component, 3-light splitting component, 4-reference lens, 5-moving lens, 6-first photoelectric detection component, 7-signal receiving component, 8-monochromatic light separation component, 9-second photoelectric detection component, 10-third photoelectric detection component, 11-fourth photoelectric detection component, 12-fifth photoelectric detection component, 13-collimating lens, 14-light hole, 15-white light source, 16-focusing lens, 17-first light splitting sheet, 18-second light splitting sheet, 19-third light splitting sheet, 20-fourth light splitting sheet, 21-first light filtering sheet, 22-second light filtering sheet, 23-third light filtering sheet, 24-fourth light filtering sheet and 25-measured lens, a-the first optical axis direction, B-the second optical axis direction, C-the reflected ray.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and embodiments.
Example 1:
a lens multi-wavelength refractive index detection device comprises a composite light source component 1, a focusing component 2, a light splitting component 3, a reference lens 4, a movable lens 5, a first photoelectric detection component 6 and a signal receiving component 7, wherein the composite light source component 1 outputs collimated light beams, the first photoelectric detection component 6, the reference lens 4, the light splitting component 3, the focusing component 2 and the composite light source component 1 are sequentially arranged from front to back along a first optical axis direction A, a focal plane of the focusing component 2 is positioned between the light splitting component 3 and the reference lens 4 and used for placing a measured lens 25, the movable lens 5 is arranged on one side of the light splitting component 3, the signal receiving component 7 is arranged on the other side of the light splitting component 3, light beams transmitted by the composite light source component 1 along the first optical axis direction A are focused on the measured lens 25 through the focusing component, and the focused light beams enter the first photoelectric detection component 6 after transmitting through the measured lens 25 and the reference lens 4, the light source component 1 is used for correcting the central position of the measured lens 25, the light beam transmitted along the first optical axis direction A is further divided into two beams after passing through the light splitting component 3, one beam is projected onto the movable lens 5 and reflected by the movable lens 5 to return to the original path, the other beam is projected onto the measured lens 25 and the reference lens 4 and reflected by the upper and lower surfaces of the measured lens 25 and the upper surface of the reference lens 4 to return to the original path, the returned light beams enter the signal receiving component 7 through the light splitting component 3, the signal receiving assembly 7 comprises a monochromatic light separation assembly 8 for separating K kinds of monochromatic light with different wavelengths from the reflected composite light, and K photoelectric detection assemblies, namely a second photoelectric detection assembly 9 and a third photoelectric detection assembly 10 …, namely a K +1 photoelectric detection assembly, for respectively receiving K kinds of monochromatic light interference signals, wherein K is more than or equal to 2; the composite light source assembly 1 comprises a collimating lens 13, a light transmitting hole 14 and a white light source 15 which are sequentially arranged from front to back along a first optical axis direction A, wherein the white light source 15 is arranged at a back focus of the collimating lens 13 and is used for enabling light emitted by the white light source 15 through the light transmitting hole 14 to be parallel light beams after passing through the collimating lens 13; the focusing assembly 2 includes a focusing lens 16; the light splitting assembly 3 comprises a semi-transparent and semi-reflective first light splitting sheet 17, the center of the movable lens 5 and the center of the first light splitting sheet 17 are both located in a second optical axis direction B perpendicular to the first optical axis direction a, when the movable lens 5 is arranged on the left side of the first light splitting sheet 17, the included angle between the side surface of the first light splitting sheet 17 and the second optical axis direction B is 45 degrees, and when the movable lens 5 is arranged on the right side of the first light splitting sheet 17, the included angle between the side surface of the first light splitting sheet 17 and the second optical axis direction B is 135 degrees; the reflectivity of the reference lens 4 and the mobile lens 5 is 1-10%; the lens frame is arranged close to the focal plane of the focusing assembly 2, and the motor is used for driving the lens frame to move left and right and is used for driving the measured lens 25 arranged on the lens frame to move automatically.
In this embodiment, the movable lens 5 is arranged on the left side of the first light splitter 17, and K is 2, that is, the monochromatic light separation component 8 separates two monochromatic lights with different wavelengths, and what is used for respectively receiving the interference signals of the two monochromatic lights is that the second photodetection component 9 and the third photodetection component 10 have two photodetection components in total; the monochromatic light separation component 8 comprises one second light splitting sheet 18 and two first light filters 21 and two second light filters 22, the second light splitting sheet 18 is a semi-transparent and semi-reflective light splitting sheet, the side surface of the light splitting sheet forms an included angle of 45 degrees or 135 degrees with the second optical axis direction B, the included angle of 45 degrees is set in the embodiment, the first light filters 21 and the second light filters 22 are respectively paired with the second photoelectric detection component 9 and the third photoelectric detection component 10 into two groups, the paired light filters and photoelectric detection components are oppositely arranged, the light filters are closer to the reflected light, the second light splitting sheet 18 is arranged on one side of the first light splitting sheet 17, the center of the second light splitting sheet is positioned in the second optical axis direction B, one group of the paired light filters and photoelectric detection components is arranged on the outer side of the second light splitting sheet, the center of the group of the light filters and the center of the photoelectric detection components are also positioned in the second optical axis direction B, the other paired optical filters and photoelectric detection components are arranged on the reflection surface side of the second optical splitter 18, and the centers of the corresponding optical filters and the centers of the photoelectric detection components are both positioned on the reflection line C of the second optical splitter 18; the reflected composite light is transmitted by the second light splitting sheet 18, and then is transmitted by the first optical filter 21 to enter the second photoelectric detection assembly 9, so that the optical interference signal detection of the wavelength 1 is completed; the reflected composite light is reflected by the second dichroic filter 18, and then is transmitted by the second optical filter 22 to enter the third photoelectric detection assembly 10, so that the optical interference signal detection of the wavelength 2 is completed.
Relevant parameters of the embodiment: the spectral range of the light source of the composite light source assembly 1 is not less than 450-660 nm; the distance between the light holes 14 and the white light source 15 is 0.1-1mm, and the diameter of the light holes 14 is 0.1-0.3 mm; the focal length of the collimating lens 13 is 80-150mm, and the preferred focal length is more than 100 mm; the focal length of the focusing lens 16 is 100-150mm, preferably more than 100 mm; the focal plane of the focusing lens is 0-8mm away from the reference lens 4, and the light reflectivity of the upper surface of the reference lens 4 and the light reflectivity of the movable lens 5 are both 1-10%; the photoelectric detection component is an area array detector, such as a CMOS or CCD image sensor, or a two-dimensional position sensitive sensor; the distance between the tested lens 25 and the reference lens 4 is 2-10mm, preferably less than 5 mm; the second dichroic filter 18 is a dichroic filter, that is, reflects light with a part of wavelength and transmits light with a part of wavelength, and the first filter 21 and the second filter 22 are both narrow-band filters, which only allow monochromatic light with corresponding wavelength to pass through.
Example 2:
the rest of the structure of the present embodiment is the same as embodiment 1, except that:
the movable lens 5 is arranged on the right side of the first light splitter 17, K is 3, the monochromatic light separation assembly 8 separates three monochromatic lights with different wavelengths, namely cyan light, yellow light and red light, and the second photoelectric detection assembly 9, the third photoelectric detection assembly 10 and the fourth photoelectric detection assembly 11 are used for respectively receiving interference signals of the three monochromatic lights; the monochromatic light separation component 8 comprises two second light splitting sheets 18 and two third light splitting sheets 19, and three first light filters 21, two second light filters 22 and three third light filters 23, the second light splitting sheets 18 and the third light splitting sheets 19 are semi-transparent and semi-reflective light splitting sheets, and the side surfaces of the light splitting sheets form an included angle of 45 degrees or 135 degrees with the second optical axis direction B, in this embodiment, the side surface of the second light splitting sheet 18 and the side surface of the third light splitting sheet 19 are both arranged to form an included angle of 135 degrees with the second optical axis direction B, the first light filters 21, the second light filters 22 and the third light filters 23 are respectively cyan light filters, yellow light filters and red light filters and are respectively paired with the second photoelectric detection component 9, the third photoelectric detection component 10 and the fourth photoelectric detection component 11 to form three groups, the paired light filters and photoelectric detection components are oppositely arranged, and the light filters are closer to the reflected light, the second light splitter 18 and the third light splitter 19 are sequentially arranged on one side of the first light splitter 17 side by side from inside to outside, the centers of the second light splitter and the third light splitter are both positioned in the second optical axis direction B, one group of paired light filters and photoelectric detection assemblies are arranged on the outer side of the outermost third light splitter 19, the centers of the group of light filters and the photoelectric detection assemblies are also positioned in the second optical axis direction B, the other paired light filters and photoelectric detection assemblies are respectively arranged on the reflection surface sides of the second light splitter 18 and the third light splitter 19, and the centers of the corresponding light filters and the centers of the photoelectric detection assemblies are both positioned on the reflection lines C of the corresponding light splitters; the reflected composite light is transmitted by the second light splitter 18 and the third light splitter 19, and then is transmitted by the first light filter 21 to enter the second photoelectric detection assembly 9, so that the optical interference signal detection of the wavelength 1 is completed; the reflected composite light is transmitted by the second light splitter 18, reflected by the third light splitter 19, transmitted by the second optical filter 22 and enters the third photoelectric detection assembly 10, and the detection of the optical interference signal with the wavelength 2 is completed; the reflected composite light is reflected by the second light splitting sheet 18, and then is transmitted by the third optical filter 23 to enter the fourth photoelectric detection assembly 11, so that the optical interference signal detection of the wavelength 3 is completed.
Example 3:
the rest of the structure of the present embodiment is the same as embodiment 1, except that:
the movable lens 5 is arranged on the right side of the first light splitter 17, K is 4, that is, the monochromatic light separation component 8 separates four monochromatic lights with different wavelengths, and four photoelectric detection components including the second photoelectric detection component 9, the third photoelectric detection component 10, the fourth photoelectric detection component 11 and the fifth photoelectric detection component 12 are used for respectively receiving interference signals of the four monochromatic lights; the monochromatic light separation assembly 8 comprises three second light splitting sheets 18, three third light splitting sheets 19 and three fourth light splitting sheets 20, four first light filtering sheets 21, four second light filtering sheets 22, four third light filtering sheets 23 and four fourth light filtering sheets 24, the second light splitting sheets 18, the third light splitting sheets 19 and the fourth light splitting sheets 20 are semi-transparent semi-reflective light splitting sheets, and the side surface of each light splitting sheet forms an included angle of 45 degrees or 135 degrees with the second optical axis direction B, in this embodiment, the side surface of the second light splitting sheet 18 and the side surface of the third light splitting sheet 19 form an included angle of 135 degrees with the second optical axis direction B, the side surface of the fourth light splitting sheet 20 forms an included angle of 45 degrees with the second optical axis direction B, the first light filtering sheets 21, the second light filtering sheets 22, the third light splitting sheets 23 and the fourth light filtering sheets 24 are respectively paired with the second photoelectric detection assembly 9, the third photoelectric detection assembly 10, the fourth photoelectric detection assembly 11 and the fifth photoelectric detection assembly 12 to form four, the paired optical filters and photoelectric detection components are oppositely arranged and are closer to the reflected light, the second light splitter 18, the third light splitter 19 and the fourth light splitter 20 are sequentially arranged on one side of the first light splitter 17 side by side from inside to outside, the centers of the paired optical filters and photoelectric detection components are arranged on the outer side of the outermost fourth light splitter 20, the centers of the paired optical filters and the photoelectric detection components are also arranged in the second optical axis direction B, the rest paired optical filters and photoelectric detection components are respectively arranged on the reflecting surface sides of the second light splitter 18, the third light splitter 19 and the fourth light splitter 20, and the centers of the corresponding optical filters and the photoelectric detection components are respectively arranged on the reflecting line C of the corresponding light splitter; the reflected composite light is transmitted by the second light splitter 18, the third light splitter 19 and the fourth light splitter 20, and then is transmitted by the first light filter 21 to enter the second photoelectric detection assembly 9, so that the optical interference signal detection of the wavelength 1 is completed; the reflected composite light is transmitted through the second light splitter 18 and the third light splitter 19, reflected through the fourth light splitter 20, transmitted through the second optical filter 22 and enters the third photoelectric detection assembly 10, and the optical interference signal detection of the wavelength 2 is completed; the reflected composite light is transmitted by the second light splitter 18, reflected by the third light splitter 19, transmitted by the third optical filter 23 and enters the fourth photoelectric detection assembly 11, and the optical interference signal detection of the wavelength 3 is completed; the reflected composite light is reflected by the second dichroic filter 18, and is transmitted by the fourth optical filter 24 to enter the fifth photoelectric detection assembly 12, so that the optical interference signal detection of the wavelength 4 is completed.
Aiming at the lens multi-wavelength refractive index detection device in any one of the embodiments 1, 2 and 3 and the simple deformation device required by different numbers of wavelengths, the detection steps are as follows:
(1) before moving into the tested lens 25, monitoring the spot center position of the projected light beam by the first photoelectric detection component 6, and taking the spot center position as a reference position for subsequent position adjustment of the tested lens 25; simultaneously, the monochromatic light separation component 8 separates K monochromatic lights with different wavelengths from the reflected composite light, K photoelectric detection components of a second photoelectric detection component 9 and a third photoelectric detection component 10 …, namely a K +1 photoelectric detection component, are used for respectively receiving interference signals of the monochromatic lights, the movable lens 5 is moved, and the positions x01 and x02 … x0K of the movable lens 5 when the interference phenomenon is respectively monitored in the K photoelectric detection components are recorded;
(2) moving the measured lens 25 in, monitoring the actual light spot center position of the projected light beam by the first photoelectric detection component 6, comparing the actual light spot center position with the reference position obtained before, guiding a user to adjust the position of the measured lens 25 according to the deviation of the actual light spot center position and the reference position, and when the actual light spot center position is superposed with the reference position, superposing the center of the measured lens 25 with the center of the light path, namely completing the position adjustment of the measured lens 25;
(3) readjusting the position of the movable mirror 5, detecting the interference signals of the reflected light from the upper surface of the reference mirror 4 and the reflected light from the movable mirror 5 in the K +1 th photodetection modules 9 and 10 …, and recording the positions x11 and x12 … x1K of the movable mirror 5 when the interference phenomena are detected in the K photodetection modules; simultaneously, interference signals of the reflected light of the lower surface of the measured lens 25 and the reflected light of the movable lens 5 in the K +1 photoelectric detection assemblies of the second photoelectric detection assembly 9 and the third photoelectric detection assembly 10 … are detected, positions x21 and x22 … x2K of the movable lens 5 when the interference phenomena are respectively detected in the K photoelectric detection assemblies, interference signals of the reflected light of the upper surface of the measured lens 25 and the reflected light of the movable lens 5 in the K +1 photoelectric detection assemblies of the second photoelectric detection assembly 9 and the third photoelectric detection assembly 10 … are detected, and positions x31 and x32 … x3K of the movable lens 5 when the interference phenomena are respectively detected in the K photoelectric detection assemblies are recorded;
(4) the refractive index n1 of the tested lens 25 at the wavelength 1 can be calculated according to x01, x11, x21 and x31, and the calculation formula is as follows:
the refractive index n2 of the tested lens 25 at the wavelength 2 can be calculated according to x02, x12, x22 and x32, and the calculation formula is as follows:
…
the refractive index nk of the measured lens 25 at the wavelength k can be calculated according to x0k, x1k, x2k and x3k, and the calculation formula is as follows:
preferably, in the step (1), monochromatic light with three different wavelengths, namely cyan light (486nm), yellow light (587nm) and red light (656nm), is separated from the reflected composite light by the monochromatic light separation component 8, and interference signals of the three monochromatic lights are respectively received by the three photoelectric detection components, namely the second photoelectric detection component 9, the third photoelectric detection component 10 and the fourth photoelectric detection component 11; in the step (4), n1 is the refractive index of the measured lens 25 at the blue wavelength, n2 is the refractive index of the measured lens 25 at the yellow wavelength, and n3 is the refractive index of the measured lens 25 at the red wavelength, and then the dispersion coefficient v of the measured lens 25 is calculated according to n1, n2 and n3dThe calculation formula is as follows:
the dispersion coefficient of the tested lens 25 can be further calculated by the arrangement, and the detection function is stronger.
Claims (8)
1. The utility model provides a lens multi-wavelength refractive index detection device which characterized in that: comprises a composite light source component (1) for outputting collimated light beams, a focusing component (2), a light splitting component (3), a reference lens (4), a movable lens (5), a first photoelectric detection component (6) and a signal receiving component (7), wherein the first photoelectric detection component (6), the reference lens (4), the light splitting component (3), the focusing component (2) and the composite light source component (1) are sequentially arranged from front to back along a first optical axis direction (A), a focal plane of the focusing component (2) is positioned between the light splitting component (3) and the reference lens (4) and is used for placing a measured lens (25), the movable lens (5) is arranged on one side of the light splitting component (3), the signal receiving component (7) is arranged on the other side of the light splitting component (3), and light beams transmitted by the composite light source component (1) along the first optical axis direction (A) are focused on the measured lens (25) through the focusing component, the focused light beam penetrates through a measured lens (25) and a reference lens (4) and then enters a first photoelectric detection assembly (6) to be used for correcting the central position of the measured lens (25), the light beam transmitted by the composite light source assembly (1) along the first optical axis direction (A) is further divided into two beams through a light splitting assembly (3), one beam is projected onto a movable lens (5) and reflected by the movable lens (5) to return along the original path, the other beam is projected onto the measured lens (25) and the reference lens (4) and reflected by the upper and lower surfaces of the measured lens (25) and the upper surface of the reference lens (4) to return along the original path, the returned light beams all enter a signal receiving assembly (7) through the light splitting assembly (3), and the signal receiving assembly (7) comprises a monochromatic light separating assembly (8) for separating monochromatic light with K different wavelengths from the reflected composite light, And a second photoelectric detection assembly (9) and a third photoelectric detection assembly (10) …, wherein the second photoelectric detection assembly and the third photoelectric detection assembly are used for respectively receiving K monochromatic light interference signals, the K +1 photoelectric detection assemblies are K photoelectric detection assemblies, and K is more than or equal to 2.
2. The multi-wavelength refractive index detection device for lens according to claim 1, wherein: the composite light source assembly (1) comprises a collimating lens (13), a light hole (14) and a white light source (15), wherein the collimating lens (13), the light hole (14) and the white light source (15) are sequentially arranged from front to back along a first optical axis direction (A), and the white light source (15) is arranged on a back focus of the collimating lens (13) and used for enabling light emitted by the white light source (15) through the light hole (14) to be parallel light beams after passing through the collimating lens (13).
3. The multi-wavelength refractive index detection device for lens according to claim 1, wherein: the focusing assembly (2) includes a focusing lens (16).
4. The multi-wavelength refractive index detection device for lens according to claim 1, wherein: the light splitting component (3) comprises a semi-transparent and semi-reflective first light splitting sheet (17), the center of the movable lens (5) and the center of the first light splitting sheet (17) are both located in a second optical axis direction (B) perpendicular to the first optical axis direction (A), when the movable lens (5) is arranged on the left side of the first light splitting sheet (17), the included angle between the side surface of the first light splitting sheet (17) and the second optical axis direction (B) is 45 degrees, and when the movable lens (5) is arranged on the right side of the first light splitting sheet (17), the included angle between the side surface of the first light splitting sheet (17) and the second optical axis direction (B) is 135 degrees.
5. The multi-wavelength refractive index detection device for lens according to claim 1, wherein: the reflectivity of the reference lens (4) and the mobile lens (5) is 1-10%.
6. The multi-wavelength refractive index detection device for lens according to claim 4, wherein: monochromatic light separation subassembly (8) include second light splitter (18), third light splitter (19) … K light splitter K-1 altogether and first light filter (21), second light filter (22) … K light filter K altogether, second light splitter (18), third light splitter (19) … K light splitter are half-transparent and half-reflecting light splitter and the side of each light splitter is 45 or 135 contained angles with second optical axis direction (B), first light filter (21), second light filter (22) … K light filter pair K group respectively with second photoelectric detection subassembly (9), third photoelectric detection subassembly (10) … K +1 photoelectric detection subassembly, pair light filter and photoelectric detection subassembly and set up relatively and the light that the light filter is closer to the reflection back, second light splitter (18), third light splitter (19) … K light splitter by interior and set up side by side in proper order in one side of first light splitter (17) and the equal light filter in center And the optical filters and the photoelectric detection assemblies are paired and arranged on the outer side of the Kth light splitting sheet at the outermost side, the centers of the optical filters and the photoelectric detection assemblies are also arranged in the second optical axis direction (B), the rest optical filters and the photoelectric detection assemblies are respectively arranged on the reflecting surface sides of the Kth light splitting sheet of the second light splitting sheet (18) and the third light splitting sheet (19) …, and the centers of the corresponding optical filters and the photoelectric detection assemblies are both arranged on the reflecting rays (C) of the corresponding light splitting sheets.
7. The multi-wavelength refractive index detection device for lens according to claim 1, wherein: the monochromatic light separation component (8) can separate three monochromatic lights, namely cyan light, yellow light and red light, from the composite light.
8. The multi-wavelength refractive index detection device for lens according to claim 4, wherein: the monochromatic light separation component (8) can separate three monochromatic lights, namely cyan light, yellow light and red light, from the composite light; the monochromatic light separation component (8) comprises two second light splitting plates (18) and two third light splitting plates (19) and three first light filters (21), three second light filters (22) and three third light filters (23), the second light splitting plates (18) and the third light splitting plates (19) are semi-transparent and semi-reflective light splitting plates, the side faces of the light splitting plates and the second optical axis direction (B) form included angles of 45 degrees or 135 degrees, the first light filters (21), the second light filters (22) and the third light filters (23) are respectively cyan light filters, yellow light filters and red light filters and are respectively paired into three groups with the second photoelectric detection component (9), the third photoelectric detection component (10) and the fourth photoelectric detection component (11), the paired light filters and the photoelectric detection components are arranged relatively, the light filters are closer to reflected light, the second light splitting plates (18) and light, The third light splitting sheet (19) is sequentially arranged on one side of the first light splitting sheet (17) side by side from inside to outside, the centers of the first light splitting sheet (17) are located in the second optical axis direction (B), one group of paired light filters and photoelectric detection assemblies are arranged on the outer side of the outermost third light splitting sheet (19), the centers of the light filters and the photoelectric detection assemblies are also located in the second optical axis direction (B), the rest paired light filters and photoelectric detection assemblies are respectively arranged on the reflection surface sides of the second light splitting sheet (18) and the third light splitting sheet (19), and the centers of the corresponding light filters and the photoelectric detection assemblies are located on the reflection lines (C) of the corresponding light splitting sheets.
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| CN201921497381.3U CN210293627U (en) | 2019-09-10 | 2019-09-10 | Lens multi-wavelength refractive index detection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110553820A (en) * | 2019-09-10 | 2019-12-10 | 宁波法里奥光学科技发展有限公司 | Lens multi-wavelength refractive index detection device and method |
| CN112147622A (en) * | 2020-09-02 | 2020-12-29 | Oppo（重庆）智能科技有限公司 | Distance measuring device, distance measuring method, camera and electronic equipment |
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2019
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110553820A (en) * | 2019-09-10 | 2019-12-10 | 宁波法里奥光学科技发展有限公司 | Lens multi-wavelength refractive index detection device and method |
| CN110553820B (en) * | 2019-09-10 | 2024-01-05 | 宁波法里奥光学科技发展有限公司 | Device and method for detecting refractive index of lens in multiple wavelengths |
| CN112147622A (en) * | 2020-09-02 | 2020-12-29 | Oppo（重庆）智能科技有限公司 | Distance measuring device, distance measuring method, camera and electronic equipment |
| CN112147622B (en) * | 2020-09-02 | 2024-02-06 | Oppo广东移动通信有限公司 | Distance measuring device, distance measuring method, camera and electronic equipment |
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