Ultraviolet wide spectrum transmission optical filter capable of reducing irradiation intensity

Abstract

The invention belongs to the field of optical filters, and particularly relates to an ultraviolet wide-spectrum transmission optical filter capable of reducing irradiation intensity, which adopts a JGS1 substrate single-side coating film structure, and a coating film system is a wide-passband induction transmission film system; the structure of the wide-passband induction transmission film system is S (HL) n1.7 H (0.67 M 1.4 H) m 0.67 M 1.7 H (LH) nA; wherein S is a JGS1 substrate; a is air; h is a high refractive index material; l is a low-refractive-index material; m is a metal material; the optical thickness of H, L and M is lambda0 / 4; m and n are the number of cycles. According to the invention, the ultraviolet radiation intensity is controllable during incidence, and the deep background and wide cut-off of spectrums in a visible region and an infrared region are realized at the same time.

Description

Technical Field

[0001] The invention belongs to the field of optical films, and in particular relates to an ultraviolet wide spectrum transmission filter which can reduce the radiation intensity and is used for ultraviolet wide spectrum transmission and realizes deep cutoff of visible / infrared spectrum. Background Art

[0002] Ultraviolet light has a short wavelength, high energy, and strong ultraviolet radiation, so it has always been the main object of photobiological research. Studies have shown that the effects of ultraviolet light on organisms include mutation, carcinogenesis, interference with the synthesis of deoxyribonucleic acid, RNA and protein, delay of cell division, and changes in permeability and motility. Ultraviolet light has become the main method for biological mutation, change, and selection of species, especially in biological breeding. In recent years, in addition to ultraviolet radiation, the space environment also has a variety of mutagenic factors such as microgravity, ultra-vacuum, acceleration and vibration of spacecraft, temperature and humidity conditions, and other unknown factors. Therefore, space mutagenesis breeding has been increasingly valued by breeders for cultivating excellent varieties. Due to the complex space environment and the lack of atmosphere, the radiation of high-energy particles such as ultraviolet rays is too strong, and the energy of ultraviolet radiation needs to be weakened. Under conditions of large temperature differences and direct sunlight, the surface temperature of the spacecraft can reach more than 150°C, and the seeds will dehydrate and dry up in such an environment. Therefore, it is urgent to effectively reduce thermal radiation and reduce the high temperature environment of seeds to provide a suitable environment for space mutagenesis breeding. Summary of the invention

[0003] The present invention aims to overcome the shortcomings of the prior art and provide a method for preparing an ultraviolet wide-spectrum transmission filter that can effectively reduce thermal radiation, reduce the high temperature environment in which seeds are located, and provide a suitable environment for space mutagenesis breeding and can reduce the radiation intensity.

[0004] To solve the above technical problems, the present invention is achieved as follows:

[0005] A method for preparing an ultraviolet wide spectrum transmission filter capable of reducing radiation intensity, comprising a substrate and a wide passband induced transmission film system, wherein the structure of the wide passband induced transmission film system is:

[0006] S|(HL)^n1.7H(0.67M1.4H)^m0.67M1.7H(LH)^n|A;

[0007] Among them: S is the JGS1 substrate; A is air; H is a high refractive index material; L is a low refractive index material; M is a metal material; m and n are the number of cycles.

[0008] Furthermore, H is made of Al2O3 and LaF3, L is made of SiO2 and MgF2, and M is made of Al coating material.

[0009] Furthermore, the H, L, and M film layers have an optical thickness of λ0 / 4.

[0010] Furthermore, the transmittance of the ultraviolet wide spectrum transmission filter capable of reducing the radiation intensity is Tavg=3%@200-400nm.

[0011] Furthermore, the deep background of the ultraviolet wide spectrum transmission filter capable of reducing the irradiation intensity is: ODavg≥6.

[0012] Furthermore, the wide cutoff of the ultraviolet wide spectrum transmission filter capable of reducing the radiation intensity is 500nm to 15000nm.

[0013] The present invention can effectively reduce thermal radiation, reduce the high temperature environment of seeds, and provide a suitable environment for space mutagenesis breeding. The filter of the present invention can design the corresponding ultraviolet wide spectrum transmittance according to the ultraviolet radiation intensity requirements, realize the control of ultraviolet radiation energy, and avoid the damage of high photon energy to seeds; at the same time, deep cutoff is achieved for the visible and infrared spectrum, effectively reducing thermal radiation, reducing the high temperature environment of seeds, and providing a suitable environment for space mutagenesis breeding. It is relatively easy to achieve a single requirement, but it is quite difficult to achieve all requirements at the same time. At present, no other related reports have been found to meet the application requirements. The present invention has controllable ultraviolet wide spectrum irradiation intensity when incident, and realizes deep background and wide cutoff of visible and infrared spectrum at the same time. It is relatively easy for the existing technology to achieve a single technical indicator, but it is quite difficult to achieve all technical indicators at the same time. The present invention has the following characteristics: (1) controllable wide passband transmittance: Tavg=3%@200~400nm; (2) deep background: ODavg≥6; (3) wide cutoff of visible and infrared regions: 500nm~15000nm. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. The protection scope of the present invention is not limited to the following description.

[0015] Figure 1 It is a schematic diagram of the film structure of the present invention;

[0016] Figure 2 Designing a transmission spectrum curve for the present invention;

[0017] Figure 3 This is the background spectrum design curve of the present invention. DETAILED DESCRIPTION

[0018] like Figures 1 to 3 As shown in the figure, the UV wide spectrum transmission filter which can reduce the radiation intensity adopts the JGS1 single-sided coating structure. The coating film system is a wide passband induced transmission film system with the following characteristics: the UV radiation intensity is controllable, and deep background and wide cutoff of the visible and infrared spectra are achieved at the same time.

[0019] The structure of the bandpass membrane system of the present invention is:

[0020] S|(HL)^n1.7H(0.67M1.4H)^m0.67M1.7H(LH)^n|A;

[0021] Wherein: S is JGS1 substrate; A is air; H is a high refractive index material; L is a low refractive index material; M is a metal material; the optical thickness of H, L, and M is λ0 / 4; m and n are the number of cycles. The H of the present invention adopts Al2O3 and LaF3, L adopts SiO2 and MgF2, and M adopts Al coating material. The ultraviolet wide spectrum transmission filter designed by this method can reduce the irradiation intensity and can achieve controllable irradiation light energy in the ultraviolet wide passband of 200 to 400nm, and can effectively reduce thermal radiation by wide cutoff of visible and infrared deep background in the range of 500nm to 15000nm. The filter can not only reduce the high temperature environment of the seeds, but also reduce the damage of ultraviolet high photon energy to the seeds, providing a suitable environment for space mutagenesis breeding.

[0022] Example

[0023] This membrane system can be realized by selecting high and low materials and appropriate number of cycles (m, n) according to the basic structure and actual needs. For example:

[0024] H uses Al2O3; L uses SiO2; M uses Al coating material: m=6; n=3.

[0025] The computer film system design software Essential Macleod was used to assist in the film system design. The wide passband induced transmission film system was used as the basic film system. The optimization synthesis technology combining the simplex method, the optimal parameter method, and the conjugate gradient method was used to obtain the ideal design spectrum. The physical thickness distribution of each layer of the designed film system is shown in Table 1.

[0026] Physical thickness distribution after optimization using three materials: H: Al2O3, L: SiO2, M: Al:

[0027] Table 1

[0028]

[0029]

[0030] It can be understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effects; as long as the use requirements are met, they are within the protection scope of the present invention.

Claims

1. An ultraviolet wide spectrum transmission filter capable of reducing radiation intensity, characterized in that: It is composed of a substrate and a wide passband induced transmission film system, and the structure of the wide passband induced transmission film system is: S|(HL)^n1.7H(0.67M1.4H)^m0.67M1.7H(LH)^n|A; Among them: S is the JGS1 substrate; A is air; H is a high refractive index material; L is a low refractive index material; M is a metal material; m and n are the number of cycles.

2. The ultraviolet wide spectrum transmission filter capable of reducing radiation intensity according to claim 1, characterized in that: The H is made of Al2O3 and LaF3, the L is made of SiO2 and MgF2, and the M is made of Al coating materials.

3. The ultraviolet wide spectrum transmission filter capable of reducing radiation intensity according to claim 2, characterized in that: The H, L and M film layers have an optical thickness of λ0 / 4.

4. The ultraviolet wide spectrum transmission filter capable of reducing radiation intensity according to claim 3, characterized in that: The transmittance of the ultraviolet wide spectrum transmission filter capable of reducing the radiation intensity is Tavg=3%@200-400nm.

5. The ultraviolet wide spectrum transmission filter capable of reducing radiation intensity according to claim 4, characterized in that: The deep background of the ultraviolet wide spectrum transmission filter capable of reducing the irradiation intensity is: ODavg≥6.

6. The ultraviolet wide spectrum transmission filter capable of reducing radiation intensity according to claim 5, characterized in that: The wide cutoff range of the ultraviolet wide spectrum transmission filter capable of reducing the radiation intensity is 500nm to 15000nm.

Images