15results about How to "Suppress stray light" patented technology

The invention relates to the technical field of infrared detectors, and in particular to an inverted cone-shaped cold shield, which comprises: a cold shield side wall and a filter mounting plate located at the upper end of the cold shield side wall; wherein a cold shield light-through hole is provided at the center of the filter mounting plate, and an annular filter bonding area is provided around the cold shield light-through hole; the cold shield side wall comprises a first cold shield side wall located at the lower part and a second cold shield side wall located at the upper part, the first cold shield side wall and the second cold shield side wall are connected to each other, the second cold shield side wall is an inverted conical surface, the upper end diameter of the second cold shield side wall is larger than the lower end diameter thereof, and the lower end diameter of the second cold shield side wall matches the upper end diameter of the first cold shield side wall; the cold shield of the invention has an overall structure of being larger at the top and smaller at the bottom, which enlarges the inner diameter of the cold shield side wall while ensuring the bonding strength of the filter, thereby playing a role in suppressing stray light.

The application provides an imaging device, which comprises a middle wave infrared lens and a detector for receiving an image formed by the infrared lens. The infrared lens has a focal length of 120 mm and is composed of a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence along an optical axis from an object side to an image side. The first lens and the third lens are both convex moon positive lenses with a convex surface facing the object side. The second lens is a convex moon negative lens with a convex surface facing the object side. The fourth lens is a convex moon positive lens with a convex surface facing the image side. The fifth lens is a convex moon positive lens with a convex surface facing the image side. The detector matched with the infrared lens is a refrigeration type infrared detector, and the number of image elements is 640*512, and the size of the image elements is 15 microns. The infrared lens is designed through secondary imaging, realizes 100% cold stop efficiency, effectively suppresses stray light, has high imaging quality and can realize clear imaging of a large target surface.

The invention belongs to the technical field of stray light suppression devices for optical machines of biochemical analyzers, and particularly relates to a stray light suppression device in an optical machine system of a biochemical analyzer. A double-conical-surface aperture diaphragm sleeve is arranged in the optical fiber channel, a double-conical-surface aperture diaphragm device is arranged in the double-conical-surface aperture diaphragm sleeve, and the other end of the double-conical-surface aperture diaphragm device abuts against the aperture diaphragm. The double-conical-surface aperture diaphragm device comprises a plurality of double-conical-surface aperture diaphragms which are connected in sequence, when the cavity diameter phi of the optical fiber channel is larger than or equal to 8 mm, the thickness of each double-conical-surface aperture diaphragm is larger than or equal to 4 mm, and the number of the double-conical-surface aperture diaphragms is larger than or equal to 4; when the number of the double-conical-surface aperture diaphragms is larger than or equal to 4, the two cone angles of the double-conical-surface aperture diaphragms are 45.0 + / -5.0 degrees and 25.0 + / -5.0 degrees respectively in the light advancing direction.

The present invention provides a method for manufacturing an eyeglass lens and related technologies, wherein the eyeglass lens comprises: a lens substrate having a plurality of substrate protrusions protruding from a substrate base on a surface of the lens substrate; and a coating, which is arranged in a manner covering the plurality of substrate protrusions and has a plurality of depressions and projections on the outermost surface. The method for manufacturing the eyeglass lens is characterized in that the lens substrate is immersed in a coating liquid and then lifted up, and the coating liquid on the lens substrate is dried while or after it flows due to its own weight to form a coating.

The invention relates to the technical field of space telescopes, in particular to a telescope stray light suppression structure, which breaks through the limitation that a stray light suppression structure is designed on the structure of a telescope traditionally, and is characterized in that a follow-up shading curtain is arranged on a follow-up dome skylight of the telescope and comprises a plurality of shading plates; a light passing area with the same aperture as the telescope exists between the two middle light shielding plates, the adjacent light shielding plates on the two sides of the light passing area are in laminated sliding connection, when the pointing direction of the telescope changes, the light passing area slides along the follow-up dome skylight, and the pointing direction of the light passing area is adjusted by overlapping or unfolding the adjacent light shielding plates. Through the shading plate, an invalid slit between the aperture of the telescope and the follow-up dome skylight is avoided, and stray light is prevented from entering through the slit. According to the invention, stray light outside a view field is effectively inhibited on the premise of not increasing the length of the lens cone of the telescope and the turning radius.

The invention provides a test fixture for testing an image sensor chip, and aims to solve the problems of poor imaging consistency, limited site layout and the like caused by stray light generated by reflection and refraction of light on the surface of a structural member in an existing structure. The through straight hole is formed in the structure between the light source and the lens, and the transparent light guide piece is embedded in the straight hole, so that illumination light is transmitted in a unique and stable path. The material and the shape of the light guide piece can be freely selected according to requirements so as to adapt to different spectral characteristics and light source positions. The light enters the dodging part and the lens system after being directionally transmitted by the light guide part, and the middle does not contact the surface of a surrounding structure, so that stray light is effectively prevented from being generated, and the illumination uniformity and imaging consistency of each test position are remarkably improved. Due to the fact that the light path is strictly limited, the scheme is not limited by the field angle of the lens any more, the site distance can be reduced, a plurality of test positions can be flexibly arranged, the number of testable points in unit area is increased, and therefore the test efficiency and the throughput capacity of a production line are improved. The probe card is simple in structure, convenient to process and high in adaptability, can be directly applied to an existing probe card system, and has good popularization value.

The invention discloses a nitride semiconductor laser with a light beam quality regulation and control layer, which sequentially comprises a substrate, a lower limiting layer, a lower waveguide layer, an active layer, an upper waveguide layer, an electron blocking layer and an upper limiting layer from bottom to top, and is characterized in that the lower limiting layer comprises a first lower limiting layer, a second lower limiting layer and a third lower limiting layer; the first lower limiting layer and the third lower limiting layer are any one or any combination of AlGaN, GaN, AlInGaN and AlInN, and the second lower limiting layer is any one or any combination of InGaN, AlInGaN and AlInN; a first light beam quality regulation and control layer is arranged between the first lower limiting layer and the second lower limiting layer, a second light beam quality regulation and control layer is arranged between the second lower limiting layer and the third lower limiting layer, and the first light beam quality regulation and control layer and the second light beam quality regulation and control layer form a light beam quality regulation and control layer. Substrate mode leakage and stray light can be inhibited, the light spot divergence angle is improved, the high-order transverse mode generation probability is reduced, and the light beam quality factor and light beam convergence are improved.

The invention discloses a grating spectrometer. The grating spectrometer comprises a shell, an imaging structure, a dispersion grating and a temperature control structure. An accommodating cavity is formed in the shell, and an imaging structure is arranged on one side of the shell; the dispersion grating is arranged in the accommodating cavity, and light emitted by the imaging structure faces the dispersion grating; the temperature control structure comprises a heating piece and a refrigeration assembly, the heating piece is arranged on the side, away from the imaging structure, of the dispersion grating in an attached mode, the refrigeration assembly is installed on the shell, and the refrigeration end of the refrigeration assembly extends into the containing cavity. According to the structure, different spectral resolution requirements can be met without replacing the dispersion grating, and installation and adjustment errors and influences on the system sensitivity and the signal-to-noise ratio are avoided. The method has very positive significance in application in the fields of low-temperature spectral imaging and the like, is simpler to operate and higher in sensitivity, and has wider application fields.

The utility model discloses a cat eye film with an effect of enhancing depth of field and a packaging box body of the cat eye film, which belong to the technical field of 3D (three-dimensional) cold laminating films and comprise a focusing lens layer, a gradient refraction layer, a light absorption isolation layer, a nano scattering layer and a high-reflection medium layer which are sequentially compounded from the surface to the bottom. Through the collaborative construction of the gradient refraction layer and the nano scattering layer, the optical limitation of the existing single-layer cat eye film is broken through, and the gradient refraction layer prolongs the light refraction path and simulates deep parallax; the nano scattering layer increases the angle diversity of emergent light, and combines the light absorption isolation layer to inhibit stray light and the high reflection layer to improve brightness, so that the depth-of-field effect is effectively improved.

The present invention discloses an intraoral image scanner, which can reduce stray light and ensure good contrast and spatial resolution. An intraoral image scanner includes a laser, an optical mechanism for processing a laser beam emitted by the laser, a scanning mechanism for forming a movable scanning spot irradiated on an image plate by the laser beam, a fluorescence collection mechanism for collecting fluorescence excited on the image plate, and a photoelectric conversion mechanism for photoelectric conversion, the intraoral image scanner also includes a filtering component for allowing the fluorescence excited by the scanning spot on the image plate to pass through, the filtering component is arranged between the fluorescence collection mechanism and the photoelectric conversion mechanism, and a slit is provided on the filtering component, and the slit is conjugate with the scanning spot irradiated on the image plate.

This invention provides a stray light suppression device based on polarization-delay combined modulation, comprising a polarization modulation module, a delay modulation module, and a light separation module. The polarization modulation module includes at least one polarizer. The delay modulation module is disposed on the light emission path of the polarization modulation module and includes at least one waveplate. The light separation module is disposed on the light emission path of the delay modulation module. The advantages of this invention are: it precisely addresses the difference in polarization characteristics between stray light and target light, and compared to traditional stray light suppression methods, it can more effectively suppress stray light of different angles and polarization states in complex optical path environments, significantly improving the image contrast and clarity of the optical system, reducing noise, and enhancing the system's resolution and sensitivity.

The invention relates to the technical field of quantum precision measurement, and discloses fluorescent nano-diamond nitrogen vacancy color center-based in-situ active oxygen quantum detection equipment, which comprises a to-be-detected sample coupling module, an integrated laser module, a scanning confocal light path, an integrated circuit module and a data processing module. The to-be-tested sample coupling module is used for bearing samples in different forms; an acousto-optic modulator is arranged in the integrated laser module, and the integrated laser module is used for generating first-order diffraction light in a continuous wave mode and a pulse mode; the scanning confocal light path performs sample positioning and in-situ scanning by using a three-dimensional piezoelectric nano displacement table, and collects NV color center fluorescence; the integrated circuit module and the data processing module cooperatively execute an all-optical detection pulse sequence, double-index fitting is performed on a fluorescence-free evolution attenuation curve, and the spin depolarization time inversion active oxygen concentration of an internal color center is extracted. According to the invention, the influence of sample drift is effectively overcome, and high-spatial-resolution active oxygen in-situ quantitative detection is realized.

The present application discloses a laser radar capable of isolating stray light, including a laser emitting component and a laser receiving component whose optical axes are relatively arranged, as well as a rotatable reflector and a stray light isolation component. The rotatable reflector includes a first reflector arranged obliquely with respect to the optical axis of the laser emitting component and a second reflector arranged obliquely with respect to the optical axis of the laser receiving component, which is located between the laser emitting component and the laser receiving component, and can rotate around the rotation axis under power drive to change the direction of the emission light beam emitted by the laser emitting component; the stray light isolation component is arranged at the junction of the first reflector and the second reflector, dividing the laser radar into a laser emitting area and a laser receiving area which are relatively and isolated. The stray light isolation component is provided with a stray light isolation part for eliminating the stray light of the emission light beam and the receiving light beam. In the above manner, the present application can eliminate the stray light of the emission light beam and the receiving light beam, thereby effectively suppressing the stray light.

This invention discloses a mid-wave cooled infrared microscopic optical system. The system includes a Dewar flask, a cold stop, a lens group, and an image plane. The Dewar flask has a housing and a window disposed on the housing. The cold stop, lens group, and image plane are disposed within the housing. The window, cold stop, lens group, and image plane are sequentially arranged along the incident light direction on the optical axis of the optical system. The lens group is installed in the optical path between the cold stop and the image plane, close to the cold stop. The lens group is used to process the incident light so that the diameter of the processed beam matches the aperture of the cold stop. The lens group is also used to further refract and focus the light passing through the cold stop, thus imageing the object onto the image plane. This invention significantly shortens the system's back intercept and overall length, achieving miniaturization and weight reduction of the system structure, while maintaining excellent cold stop matching characteristics and imaging performance, making it particularly suitable for mid-wave cooled infrared detectors.

The invention discloses an anti-reflection semiconductor laser device which comprises a base, a tube tongue, a heat sink, a semiconductor laser chip, a tube pin and a tube cap. The tube tongue is arranged on the base, the heat sink is fixed on the tube tongue, the semiconductor laser chip is fixed on the heat sink, the tube pin is fixed at the bottom of the base, the tube cap covers the base, and the tube cap comprises a tube shell and a light window; the tube tongue, the heat sink, the semiconductor laser chip and the tube cap all adopt a partial or total anti-reflection structural design. Through structural optimization and functional modification of core components such as the tube tongue, the heat sink, the semiconductor laser chip and the tube cap, all-directional and efficient suppression of primary reflection light of an optical element is achieved, the working stability of a device is remarkably improved, the service life of the device is remarkably prolonged, and the actual application requirements of the fields of sensing, display, communication and the like are met.