CN210270243U

CN210270243U - Ultraviolet filter for full-solar blind

Info

Publication number: CN210270243U
Application number: CN201921347388.7U
Authority: CN
Inventors: 宋瑛林; 杨勇; 储祥勇
Original assignee: Suzhou Micronano Laser Photon Technology Co ltd
Current assignee: Suzhou Micronano Laser Photon Technology Co ltd
Priority date: 2019-08-19
Filing date: 2019-08-19
Publication date: 2020-04-07
Anticipated expiration: 2029-08-19

Abstract

The utility model discloses a full-solar blind ultraviolet filter, wherein a second substrate comprises a base, a first cut-off filter and a second cut-off filter are respectively arranged at two sides of the base, a first substrate and a third substrate are respectively arranged at two sides of the second substrate, the first substrate comprises a base, a first short wave pass filter and a first induced filter are respectively arranged at two sides of the base, the first inducing filter is arranged at one side close to the first cut-off filter, the third substrate comprises a substrate, the second short-wave-pass filter and the second inducing filter are respectively arranged at two sides of the substrate, and the second induced filter is located and is close to one side of the second cut-off filter, include the reflection inhibition layer in first induced filter and the second induced filter, the reflection inhibition layer is the dielectric layer or metal film, the utility model discloses a filter of the all-dielectric multilayer film, do not need one or more slice polymer materials; the addition of the reflection inhibiting layer can effectively reduce the reflectivity of the induced structure filter in a visible light region; the whole is thin.

Description

Ultraviolet filter for full-solar blind

Technical Field

The utility model relates to an ultraviolet filter technical field especially relates to a blind ultraviolet filter of whole day.

Background

The wavelength range of Ultraviolet (UV) radiation is between 10 and 400nm, and the wavelengths of ultraviolet radiation reaching the earth surface through the absorption of solar UV radiation of 10nm-400nm by the atmosphere are all above 290nm, so the wavelength band of 200nm-280nm is generally called solar blind ultraviolet band. Therefore, if ultraviolet signal sources (such as flame, high-voltage discharge arc, ultraviolet light source and the like) need to be detected under the sunlight condition, the detection is carried out in the solar blind ultraviolet band. This approach typically requires the use of a deep cut-off (above OD 10) solar-blind uv band filter.

At present, the main technical approaches for realizing the optical filter at home and abroad are as follows: one piece of polymer material (absorption wave band 300-. The solar blind ultraviolet filter realized by the technology is complex to process, the thickness of a finished product is large, and certain problems exist in the aspects of temperature adaptability, long-term timeliness, stability and the like, so that the solar blind ultraviolet filter with higher performance is realized by adopting a more advanced technical method, and the solar blind ultraviolet filter is a problem to be solved urgently in the field of solar blind ultraviolet detection at present.

The utility model aims at providing an all-dielectric solar blind filter technique compares with traditional solar blind filter, no longer use stability and the poor polymer material of timeliness, has still less substrate number and the thinner thickness of whole simultaneously.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a full-solar-blind ultraviolet filter, which realizes the filter of a full-medium multilayer film without one or more pieces of polymer materials; the addition of the reflection inhibiting layer can effectively reduce the reflectivity of the induced structure filter in a visible light region; the three substrates are combined, the whole thickness can be 0.6mm-5mm, and the thickness is thinner.

In order to achieve the above purpose, the utility model adopts the technical scheme that: an all-solar blind ultraviolet filter comprises a pass band in a wavelength range of at least 240-280nm and a central wavelength in the wavelength range of 240-280nm, wherein the peak transmittance in the wavelength range of 240-280nm is more than 15%, the all-solar blind ultraviolet filter comprises a first substrate, a second substrate and a third substrate which are arranged side by side, the second substrate comprises a base, a first cut-off filter and a second cut-off filter are respectively arranged on two sides of the base, a first substrate and a third substrate are respectively arranged on two sides of the second substrate, the first substrate comprises a base, a first short wave pass filter and a first induction filter, the first short wave pass filter and the first induction filter are respectively arranged on two sides of the base, the first induction filter is arranged on one side close to the first cut-off filter, the third substrate comprises a base, a second short wave pass filter and a second induction filter, the second short-wave pass filter and the second induction filter are respectively positioned at two sides of the substrate, the second induction filter is positioned at one side close to the second cut-off filter, the first induction filter and the second induction filter both comprise reflection inhibition layers, the reflection inhibition layers are dielectric layers or metal films, and the absorptivity of the reflection inhibition layers at a wavelength section of 260nm is less than or equal to 5%.

As a further optimization, the substrate is fused silica glass.

As a further optimization, each of the first and second inducing filters further includes a first high refractive index layer, a first low refractive index layer, and a metal layer.

As a further optimization, the first high-refractive-index layer is H_fO₂A layer of material; the first low refractive index layer is SiO₂A layer of material; the metal layer is an Al material layer.

As a further optimization, the first short wave pass filter, the first cut-off filter, the second cut-off filter and the second short wave pass filter each include a second high refractive index layer and a second low refractive index layer.

As a further optimization, the second high refractive index layer is H_fO₂A layer of material; the secondThe low refractive index layer is SiO₂Layers of material or MgF₂A layer of material.

As a further optimization, the superposed thickness of the first substrate, the second substrate and the third substrate is 0.6-5 mm.

As a further optimization, the ultraviolet epoxy glue adhesion layer is further included, and the ultraviolet epoxy glue adhesion layer is positioned between the first substrate and the second substrate and/or between the second substrate and the third substrate.

As a further optimization, the cut-off depth is greater than OD9 in the wavelength range of 290-300 nm; the cut-off depth is greater than OD11 in the wavelength range of 300-800 nm; the cut-off depth is greater than OD10 above the 800nm wavelength.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the utility model realizes the optical filter of the all-dielectric multilayer film, and does not need one or more pieces of polymer material;

2. the reflection inhibition layer is added, the thickness of the reflection inhibition layer is in the nm order, and the reflectivity of the induced structure filter in a visible light area can be effectively reduced;

3. the three-layer substrate consists of three substrates, the whole thickness can be 0.6mm-5mm, and the thickness is thinner;

4. the total solar blind ultraviolet filter has a peak transmittance of more than 15% in the wavelength range of 240-280nm, a cut-off depth of more than OD9 in 290-300nm, a cut-off depth of more than OD11 in 300-800nm and a cut-off depth of more than 800nm of more than OD 10.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

FIG. 2 shows the spectrum curve of 282nm at 242-.

Fig. 3 is the spectral curve of the short-wave pass filter of the present invention.

Fig. 4 is a spectrum curve of the induced filter and the conventional induced filter according to the present invention.

In the figure, 1a. a first substrate; 1b. a second substrate; 1c. a third substrate; 10. a substrate; 11. a first inducing filter; 12. a second inductive filter; 13. a first short-wave pass filter; 14. a first cut-off filter; 15. a second cut-off filter; 16. and a second short-wave pass filter.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1 to 4, a total solar blind ultraviolet filter, which has a pass band in a wavelength range of at least 240-, the third substrate 1c includes a base 10, a second short-wave pass filter 16 and a second induction filter 12, the second short-wave pass filter 16 and the second induction filter 12 are respectively located at two sides of the base 10, the second induction filter 12 is located at a side close to a second cut-off filter 15, the first induction filter 11 and the second induction filter 12 both include reflection suppression layers, the reflection suppression layers are dielectric layers or metal films, and an absorption rate of the reflection suppression layers at a wavelength band of 260nm is less than or equal to 5%.

Further, the reflection suppressing layer is made of oxygen-deficient oxide material, such as hafnium oxide (HfO)_2-xThe metal film may be selected from Al, Ni, Cr, etc.

Each of the first and

second induction filters

11 and 12 further includes a first high refractive index layer, a first low refractive index layer, and a metal layer.

The first induced filter comprises four functional layers, namely a first high-refractive-index layer, a first low-refractive-index layer, a metal layer and a reflection inhibition layer, wherein the reflection inhibition layer can be positioned at the outermost side of the whole structure or the middle position of the whole structure, and is added with the reflection inhibition layer, the thickness of the reflection inhibition layer is nm, so that the reflectivity of the induced structure filter in a visible light region can be effectively reduced; the second induced filter also has four functional layers, the structure of which can be the same as or different from that of the first induced filter, and the total number of layers can be 7-11.

The first high refractive index layer is H_fO₂A layer of material; the first low refractive index layer is SiO₂A layer of material; the metal layer is an Al material layer.

The first short-wavelength pass filter 13, the first cut filter 14, the second cut filter 15, and the second short-wavelength pass filter 16 each include a second high refractive index layer and a second low refractive index layer, and the four layers may be the same or different.

The second high refractive index layer is H_fO₂A layer of material; the second low refractive index layer is SiO₂Layers of material or MgF₂A layer of material.

The superposition thickness of the first substrate 1a, the second substrate 1b and the third substrate 1c is 0.6-5mm, and the whole thickness of the all-solar blind ultraviolet filter is thinner.

The all-day blind ultraviolet filter also comprises an ultraviolet epoxy adhesive layer, wherein the ultraviolet epoxy adhesive layer is positioned between the first substrate 1a and the second substrate 1b and/or between the second substrate 1b and the third substrate 1c, and the ultraviolet epoxy adhesive layer can fix the first substrate 1a, the second substrate 1b and the third substrate 1c.

The cut-off depth of the full-solar blind ultraviolet filter is greater than OD9 in the wavelength range of 290-300 nm; the cut-off depth is greater than OD11 in the wavelength range of 300-800 nm; the cut-off depth is greater than OD10 above the 800nm wavelength.

The utility model discloses a 3 substrate combinations, 15% at 262nm wavelength peak value transmittance.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. The all-solar blind ultraviolet filter is characterized by comprising a pass band in a wavelength range of at least 240-280nm and a central wavelength in the wavelength range of 240-280nm, wherein the peak transmittance in the wavelength range of 240-280nm is greater than 15%, the all-solar blind ultraviolet filter comprises a first substrate (1a), a second substrate (1b) and a third substrate (1c) which are arranged side by side, the second substrate (1b) comprises a substrate (10), a first cut-off filter (14) and a second cut-off filter (15) are respectively arranged on two sides of the substrate (10), a first substrate (1a) and a third substrate (1c) are respectively arranged on two sides of the second substrate (1b), the first substrate (1a) comprises a substrate (10), a first short-wave pass filter (13) and a first induction filter (11), the first short-wave pass filter (13) and the first induction filter (11) are respectively arranged on two sides of the substrate (10), the first induction filter (11) is located on one side close to the first cut-off filter (14), the third substrate (1c) comprises a substrate (10), a second short-wave pass filter (16) and a second induction filter (12), the second short-wave pass filter (16) and the second induction filter (12) are respectively located on two sides of the substrate (10), the second induction filter (12) is located on one side close to the second cut-off filter (15), the first induction filter (11) and the second induction filter (12) both comprise reflection inhibition layers, the reflection inhibition layers are dielectric layers or metal films, and the absorptivity of the reflection inhibition layers at a wave band section of 260nm is less than or equal to 5%.

2. The all-day blind uv filter according to claim 1, characterized in that the substrate (10) is fused silica glass.

3. The all-solar blind uv filter according to claim 1, characterized in that each of the first and second inducing filters (11, 12) further comprises a first high refractive index layer, a first low refractive index layer and a metal layer.

4. The all-solar-blind uv filter according to claim 3, wherein the first high refractive index layer is H_fO₂A layer of material; the above-mentionedThe first low refractive index layer is SiO₂A layer of material; the metal layer is an Al material layer.

5. The all-solar blind uv filter according to claim 1, characterized in that the first short-wavelength pass filter (13), the first cut-off filter (14), the second cut-off filter (15) and the second short-wavelength pass filter (16) each comprise a second high refractive index layer and a second low refractive index layer.

6. The all-solar-blind ultraviolet filter according to claim 5, wherein the second high refractive index layer is H_fO₂A layer of material; the second low refractive index layer is SiO₂Layers of material or MgF₂A layer of material.

7. The all-solar blind uv filter according to claim 1, characterized in that the first (1a), second (1b) and third (1c) substrates have a superimposed thickness of 0.6-5 mm.

8. The all-solar blind uv filter according to claim 1, further comprising a uv epoxy adhesive layer between the first substrate (1a) and the second substrate (1b) and/or between the second substrate (1b) and the third substrate (1 c).

9. The all-solar blind ultraviolet filter as claimed in claim 1, wherein the cut-off depth is greater than OD9 in the wavelength range of 290-300 nm; the cut-off depth is greater than OD11 in the wavelength range of 300-800 nm; the cut-off depth is greater than OD10 above the 800nm wavelength.