9 results about "Photometric system" patented technology

In certain embodiments, an ophthalmic system includes a light system, an imaging system, and a computer. The light system directs light towards a test target according to an expected parameter set to yield an actual spot on the test target. Each expected brightness parameter of the set describes an expected brightness of the actual spot. The imaging system generates a digital image of the actual spot. The computer determines pixel values of the pixels of the digital image and determines an actual brightness parameter set according to the pixel values. Each actual brightness parameter of the set describes an actual brightness of the actual spot and corresponds to an expected brightness parameter. The computer compares the actual brightness parameters to the corresponding expected brightness parameters and detects a deviation. The computer identifies an issue of the light system indicated by the deviation and provides an output associated with the issue.

A photometric system for measuring one or more neurophysiological parameters of a target, the photometric system comprising an optical arrangement. The optical arrangement includes a first optical input for receiving input light from a light source, a first optical output for providing output light to a target, a first light path from the first optical input to the first optical output, a second optical input for receiving light from the target, a second optical output, a second light path from the second optical input to the second optical output, a single-photon avalanche detector configured to receive light from the second optical output, and a processor element configured to receive data from the detector and to carry out single-photon counting.

In certain embodiments, an ophthalmic system includes a light system, an imaging system, and a computer. The light system directs light towards a test target according to an expected parameter set to yield an actual spot on the test target. Each expected brightness parameter of the set describes an expected brightness of the actual spot. The imaging system generates a digital image of the actual spot. The computer determines pixel values of the pixels of the digital image and determines an actual brightness parameter set according to the pixel values. Each actual brightness parameter of the set describes an actual brightness of the actual spot and corresponds to an expected brightness parameter. The computer compares the actual brightness parameters to the corresponding expected brightness parameters and detects a deviation. The computer identifies an issue of the light system indicated by the deviation and provides an output associated with the issue.

The present application is applicable to the technical field of computer vision, and provides a method for reconstructing a three-dimensional object combining structured light and photometry and a terminal device, wherein the method comprises: acquiring N first images, wherein each first image is obtained by shooting after a coded pattern having a coding stripe sequence is projected to a three-dimensional object, and N is a positive integer; determining structured light depth information of the three-dimensional object based on the N first images; acquiring M second images, wherein the M second images are obtained by shooting after P light sources are respectively projected to the three-dimensional object from different directions, and M and P are positive integers; determining photometric information of the three-dimensional object based on the M second images; and reconstructing the three-dimensional object based on the structured light depth information and the photometric information. Therefore, the structured light system and the photometric system are combined to reconstruct the three-dimensional object, and the precision of a three-dimensional reconstruction result of the three-dimensional object with complex surfaces is improved.

The invention discloses a silicon-based cavity optical power system gyroscope decoupling device based on FSR multiple modes. The silicon-based cavity optical power system gyroscope decoupling device comprises a pump light system, a probe light system and a silicon-based cavity optical power micro-hemisphere gyroscope chip. Pump laser passes through a light polarization controller A to obtain laser in any polarization state, and the laser is coupled into a micro-hemisphere cavity of the silicon-based cavity light force micro-hemisphere gyroscope chip through a driving optical fiber; emergent light enters a photoelectric detector A, and an output signal of the photoelectric detector A is connected with a computer A through a data collector A; the detection laser passes through the light polarization controller B to obtain laser in any polarization direction, and the laser enters the micro-hemisphere cavity through coupling of the detection optical fiber; emergent light enters a photoelectric detector B, and electric signals output by the photoelectric detector B respectively enter a frequency spectrograph and a data acquisition unit B; according to the invention, the driving mode and the detection mode of the cavity can be independently decoupled by using the optical-mechanical coupling effect principle of the cavity optical power system and the independence between the harmonic peak offsets in the optical spectrum and the mechanical spectrum.

A sample analyzer, a photometer and a photometric system. The sample analyzer (2000) comprises a light source (100), a photometer (600) and a processor (500); the photometer (600) comprises a photoelectric conversion assembly (401) and a signal processing assembly (400); the photoelectric conversion assembly (401) comprises a photomultiplier tube (200) and a voltage divider circuit (300), an input end node of the voltage divider circuit (300) being connected to the cathode of the photomultiplier tube (200), and an output end node of the voltage divider circuit (300) being connected to the anode of the photomultiplier tube (200). N+1 voltage divider nodes are sequentially arranged between the input end node and the output end node, and the N+1 voltage divider nodes are respectively and sequentially connected to a photoelectron focusing electrode and N dynodes of the photomultiplier tube (200), such that voltage divider branches between two adjacent nodes form N+2 divided voltages; at least one of the divided voltage corresponding to the input end node, the divided voltage corresponding to the voltage divider node N+1, and the divided voltage corresponding to the voltage divider node N is configured to be less than the divided voltages corresponding to the other voltage divider nodes.

A sample analyzer, a photometer, and a photometric system. The sample analyzer (2000) comprises a light source (100), a photometer (600), and a processor (500); the photometer (600) comprises a photoelectric conversion assembly (401) and a signal processing assembly (400); the photoelectric conversion assembly (401) comprises a photomultiplier tube (200) and a voltage divider circuit (300); an input end node of the voltage divider circuit (300) is connected to a cathode of the photomultiplier tube (200); an output end node of the voltage divider circuit (300) is connected to an anode of the photomultiplier tube (200); N+1 voltage divider nodes are sequentially arranged between the input end node and the output end node; the N+1 voltage divider nodes are respectively connected to a photoelectron focusing electrode and N dynodes of the photomultiplier tube (200) in sequence, and voltage divider branches between adjacent nodes form N+2 divided voltages; at least one of the divided voltage corresponding to the input end node, the divided voltage corresponding to the voltage divider node N+1, and the divided voltage corresponding to the voltage divider node N is configured to be less than the divided voltages corresponding to the other voltage divider nodes.

The invention relates to a wire grid polarizer-based miniaturized quantum sensor detection optical module, and belongs to the field of optical system miniaturization. The module comprises a polarizer, a reflector with a through hole, a 1 / 4 wave plate, a wire grid polaroid, a collimating lens, an alkali metal gas chamber, a polarization beam splitter and a balance detector. On the basis of an existing quantum sensor detection light system, light beam polarization is controlled through the wire grid polaroid, the reflector with the through hole and the 1 / 4 wave plate, light paths are reflected twice, light path folding is achieved, and therefore the system is ultra-thin, meanwhile, the polarization degree of detection light is improved through the wire grid polaroid, and the detection accuracy is improved. A polarization beam splitter and a balance detector are combined to realize optical rotation angle detection. And the miniaturization propulsion of the atomic inertial sensor and the improvement of the detection stability are facilitated.

This invention provides a method, system, and readable storage medium for searching white dwarfs using a multicolor photometric system, comprising: S1: acquiring a multicolor magnitude table containing extinction-corrected magnitudes for the u, g, and i bands; S2: calculating the color index g-i and composite color index (u-g)-1.5(g-i) for each star based on the multicolor magnitude table; S3: marking the positions of all stars on a two-color map with g-i as the abscissa and (u-g)-1.5(g-i) as the ordinate; S4: selecting stars falling within a pre-defined white dwarf distribution region as white dwarf candidates. This invention analyzes SAGES multicolor photometric data to find an optimal color combination, constructs a two-color map, and delineates exclusive distribution regions for white dwarfs, thereby achieving rapid and high-purity screening of white dwarfs from large-sample survey data.