168results about How to "Eliminate stray light" patented technology

This invention concerns apparatus and a method for authenticating a subject using their eye as an identifying biometric, in particular the shape of their cornea. The apparatus comprises an image projection device to generate and project an image of a pattern, made up of plural discrete points, onto at least a part of the cornea of an eye of the person. An image capture device to capture an image of the pattern of plural discrete points, after reflection in at least a part of the cornea of an eye of the person. And, a computer processor to extract a data set defining the locations of the discrete points in the captured image. The method comprises capturing an image of an illuminated pattern, made up of plural discrete points, after reflection in at least a part of the cornea of an eye of the subject. Comparing the locations of the discrete points in the pattern of the captured image against the locations of the discrete points in the pattern of a reference image. And, authenticating the identity of the subject depending on the similarity of comparison. In a further aspect the invention is software for performing the method.

A self-contained pill dispenser is disclosed. A housing is provided and a hopper for containing a plurality of pills is supported by the housing. A feed chute having a transport spiral therein is operatively connected to the hopper for receiving pills therefrom. The transport spiral has an outlet and controllable aperture. A vibrating plate is disposed proximate the outlet. A drive mechanism is connected to the vibrating plate for imparting vibration thereto. The drive mechanism can abruptly stop the vibration of the vibrating plate. A microcontroller is also operatively connected to the hopper, the transport spiral, and the drive mechanism. The system can self-calibrate the mechanism for counting and dispensing pills.

A micro optical sensor of laser dust particle counter, which is characterized by its components, which comprises the following: there is cylinder mirror, spherical mirror and light trap located orderly in the direction of light beam of laser source components. The spherical mirror is located in the right side of the cylinder mirror and light-sensitive area and that of light-electricity detector are located on both sides around the sphere center of spherical mirror, which satisfies the image relationship of geometry optics; vision diaphragm which is suited for the shape of light sensitive-area is located in front of light-electricity detector; the light-electricity detector employs photoelectric diode of high sensitivity or micro photoelectric multiplier tube sealed with metal; A band pass preposition enlarging circuit is fixed in the shell of scatter body of optics sensor with the same width of pulse frequency of scattering light.

A self-contained pill dispenser is disclosed. A housing is provided and a hopper for containing a plurality of pills is supported by the housing. A feed chute is operatively connected to the hopper for receiving pills therefrom. The feed chute has an outlet and controllable aperture. A vibrating plate is disposed proximate the outlet. A drive mechanism is connected to the vibrating plate for imparting vibration thereto. The drive mechanism has a mechanism for abruptly stopping the vibration of the vibrating plate. A microcontroller is also operatively connected to the hopper, the feed chute, and the drive mechanism.

The invention discloses a double-beam spectrometer, which comprises a light source for emitting reference light and detection light and a spectrometer main unit. The double-beam spectrometer is also provided with a first optical fiber, a second optical fiber and a third optical fiber, wherein the first optical fiber is used for transmitting the reference light from the light source to the spectrometer main unit; the second optical fiber is used for transmitting the detection light from the light source to a sample; and the third optical fiber is used for transmitting the detection light with sample information from the sample to the spectrometer main unit. The spectrometer main unit comprises a slit piece, a collimating lens, a plane grating, an imaging lens, a cylindrical lens and an area array detector, which are sequentially arranged along a light path. The emergent light of the first and second optical fibers enters the slit piece. The reference light and the detection light are simultaneously displayed and received, and the influence of light source fluctuation, stray light and electrical noise is effectively eliminated.

The invention provides an optical structure tool for a stray light resisting test of a star sensor and a testing method. A light blocking barrel equipped with a planar coating with high absorptivity and extinction cones inside is arranged, a digital display variable diaphragm and stray light eliminating diaphragms are mounted in the light blocking barrel, and a light transmitting aperture is formed in the light output direction of the tool, or a solar battery cell and a high-precision optical reflector are mounted in the light output direction of the tool. The area of an output light spot is controlled by adjusting the diameter of the digital display variable diaphragm in the light blocking barrel, light spots outside a light hood of the star sensor can be prevented from irradiating test background space, meanwhile, the stray light caused by the diffraction phenomenon is reduced by means of the stray light eliminating diaphragms, so that the light interference of the background environment is reduced in the stray light testing process, and the testing precision of the star sensor in a darkroom environment is improved.

A goniophotometer has a main rotating table, a sync-rotating table, a luminaire rotating table and light detecting tubes (4-1, 4-2). The main rotating table has a main rotating axis (1-2) and a main mirror (1-4) reflecting the light from a luminaire under test (5). The sync-rotating table has a sync-rotating axis (2-2) and a sync-mirror (2-4) located in the reflection path of the main mirror (1-4). The sync-rotating axis (2-2) is coincident with the main rotating axis (1-2). The luminaire rotating table has a luminaire rotating axis (3-2) which can drive the rotation of the luminaire under test (5). The luminaire rotating axis (3-2) is perpendicular to the main rotating axis (1-2). The light detecting tubes (4-1, 4-2) are arranged in the emergent light path to detect the luminous intensity of the luminaire under test (5) in different direction.

The invention relates to the combination of lower transmittance etalons with higher transmittance filters, including use of a single circular polarizer with high efficiency and optical performance for its filtered polarization, to achieve necessary throughput of a narrow bandpass region. The lower transmittance etalons can be achieved by using lower transmittance solid-state etalon materials, or by control of the coatings on the etalon. Alternate configurations are described that reduce the optical assembly's footprint, and/or include additional filters to remove stray light. An innovative option to heat the etalon directly is disclosed to actively stabilize and maintain the etalon's bandpass.

The invention relates to a lens module, which comprises a lens cone, as well as a first lens, a second lens, a third lens and two shading pieces arranged in the lens cone, wherein the two shading pieces are arranged between non-optical parts of two adjacent lenses at intervals. The first, the second and the third lenses are orderly arranged from the object end to the image end of the lens module. Except the surface, leaning against the inner wall of the lens cone, of the non-optical lens part of the second lens, and the surface leaning against the first and the third lenses and forming an acute angel with the optical axis of the lens module, the other parts of the non-optical part is atomized, so that the stray light in imaged images can be eliminated and the imaging quality of the lens module can be improved.

An apparatus and method for authenticating a subject using the eye as an identifying biometric, in particular the shape of the cornea. An image projection device generates and projects an image of a pattern, of plural discrete points, onto at least a part of the cornea of the eye. An image capture device captures an image of the pattern of plural discrete points, after reflection from the cornea of the eye. A computer processor extracts data defining the locations of the discrete points in the captured image. The method steps are capturing an image of a pattern, made up of plural discrete points, after reflection from of the cornea of a subject; comparing the locations of the discrete points in the captured image against the locations of discrete points in a pattern of a reference image; and, authenticating the identity of the subject depending on the similarity of the comparison.

An erecting equal-magnification lens array plate includes a stack of a plurality lens array plates built such that pairs of corresponding lenses form a coaxial lens system, where each lens array plate is formed with a plurality of convex lenses on both surfaces of the plate. The plate receives light from a substantially straight light source facing one side of the plate, and the plate forms an erect equal-magnification image of the substantially straight light source on an image plane facing the other side of the plate. A light shielding member operative to shield light not contributing to imaging is formed in the neighborhood of a position in the intermediate plane in the erecting equal-magnification lens array plate where an inverted image of the substantially straight light source is formed. The main lens arrangement direction of the convex lenses differs from the main scanning direction of the erecting equal-magnification lens array plate.

An optical pickup head is provided, which is utilized for picking up the image of an object. The optical pickup head comprises a shell body, a diffusion structure, an optical source module and a sensitization module. The diffusion structure is connected with the shell body. The optical source module is provided with a basal plate and a first optical source positioned on the facade of the basal plate. The facade of the basal plate is positioned on the external surface of the diffusion structure. The first optical source provides an initial light ray and casts the light ray into the diffusion structure. Then, the diffusion structure processes the initial light ray into an equalized light ray and transmits the processed light ray. The sensitization module is positioned inside the shell body to sense a reflected light ray which is produced when the equalized light ray is reflected by the object. Therefore, the invention can be applied to eliminate the identification dead corner resulted from strong reflected light ray, enhance the lighting efficiency, reduce the number of optical sources and consumption of electric power, improve the evenness of lighting and improve the allowed scope for inclined angle.

In a magnetic recording head including an optical waveguide for guiding a laser beam to a surface of a magnetic recording medium, a shield is provided in the vicinity of at least one portion changing discontinuously in structure of the optical waveguide to absorb or reflect non-propagating light leaking from the discontinuous portion to the outside of the optical waveguide.

The invention discloses an optical system of an attitude sensor. A diaphragm of the optical system is arranged on the first surface of the quartz window plate glass of the optical system, which is beneficial to reducing the size of the optical system and eliminating parasitic light; and the optical system can simultaneously realize large field, large aperture and achromatism by utilizing four common optical materials and effectively shorten the size of the optical system by using a plurality of osculant positive and negative lenses to correct aberration. By adopting the layout mode, the optical system has higher MTF (modulation transfer function) while ensuring relatively uniform full field defocused spots, thereby being capable of giving consideration to both the optical imaging of a star sensor and the imaging of the optical sensor with high resolution requirements.

A photographing optical lens assembly includes five lens elements which are, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element has negative refractive power. The fourth lens element has an image-side surface being concave in a paraxial region thereof. The fifth lens element has an object-side surface and an image-side surface being both aspheric.

The invention requests to protect a Raman spectrum substance monitoring system based on internet of things, and a method. The monitoring system used for Raman spectrum substance monitoring, and comprise testing terminals, a wireless data transmission module, and a cloud side processor; the testing terminals are mainly used for detecting various indexes of the detected substance by adopting the Raman spectrum detector by the production enterprise, the government supervision mechanism, the consumer including the food medicine, generating detection data, and sending the generated detection data and image to the cloud-side processor in an encryption way in real time through the wireless transmission module; the cloud-side processor is mainly used for receiving the detection data sent by the testing terminals arranged at various distributed websites, computing, processing, and storing the detection data, and judging whether the detection data conforms to the national and international standards; and meanwhile; the result can be timely fed back to the detection terminals at various places, the platform management center, and related departments and enterprises according to the level of the comprehensive data of the preset threshold.

The invention provides a system for eliminating eye ground camera stray light. The system comprises an imaging subsystem and an illumination subsystem. The imaging system consists of a 1/4 wave plate, an eye objective lens, a polarized beam splitter prism and an imaging objective lens which are arranged in sequence. The illumination subsystem consists of an annular light source, a light uniformizing lens, a polarized beam splitter prism and an eye objective lens. After light emitted by the annular light source passes through the polarized beam splitter prism, linearly polarized light of vertical component is reflected, sequentially passes through the eye objective lens and the 1/4 wave plate and then enters the eyes of an observer, light reflected by the eye grounds of the eyes of the observer passes through the 1/4 wave plate and the eye objective lens and is transmitted into the imaging objective lens through the polarized beam splitter prism. After the polarized beam splitter prisms and the 1/4 wave plate are added into the system for eliminating the eye ground camera stray light, stray light of higher than 99.5%, produced by the eye objective lenses is eliminated, and stray light inhabitation effect is improved.

The invention discloses a quick pulse wave detection system, a detection method and a detection program. The detection system comprises a photoelectric sensor module, a data processing module, a single-chip microcomputer module, a liquid crystal display module and a power module. The photoelectric detection technology is the basis, a pulse amplitude light modulation technology is adopted to eliminate influences of stray light, dark current and various kinds of interference, and the sampling technology and digital signal processing methods such as digital filtering are adopted to take the place of the function of an amplification and filter circuit in a simulation circuit. Besides, detection time of a pulse value is shortened through design of an algorithm and the purpose of improving work efficiency is achieved. Compared with other pulse measurement devices, the quick pulse wave detection system is high in work efficiency, low in cost, small and convenient to carry, and a patient can collect pulse signals at any time in any place and observe the pulse value. Meanwhile, the pulse value can be accurately measured in 10 seconds, and wide application prospects are achieved.

The invention discloses a distribution photometer, comprising two independent bases, a mirror mounted one end of a pivoted arm connected with the first base, a first optical receiver mounted on another end of the pivoted arm, opposite an object light source, while the pivoted arm rotates the mirror and the first optical receiver around a first rotary central line, and a second optical receiver mounted on the second base, which rotates around the first rotary central line synchronously with the pivoted arm to synchronously receive the light beam reflected by the mirror, wherein the object light source via a lamp arm is connected with the first base, which rotates around itself shaft. The object light source is all in stable and natural burning point state, and the invention effectively reduces the measurement error via synchronously receiving the light beam of object light source to improve measurement accuracy, while the invention arranges two optical receivers to realize two measuring arm lengths without adjusting the mirror.