112 results about "Dual detector" patented technology

The present invention belongs to the field of fine surface structure measuring technology, and relates to one kind of differential confocal scanning detection method with high spatial resolution. Differential confocal microscopic double receiving light path configuration and double detector subtraction form the differential confocal signal in measuring the workpiece. Optical super-resolution confocal microscopic detection method is adopted to raise the transverse resolution, and differential confocal microscopic detection method is adopted to raise the longitudinal resolution, so as to reach differential confocal scanning detection of high spatial resolution. The method can meet the requirements in high spatial resolution, high precision and great measurement range, and is especially suitable for the measurement of fine surface 3D structure, miniature steps, miniature grooves, line width, surface appearance, etc.

A method and system for automatic power-up and automatic power-down of a computer system based on the position and/or rotation of an associated stylus and/or hinge. In one embodiment, the computer system is a portable computer having a logic board, a display screen, a digitizer and a receiving slot for an associated stylus. When the stylus is removed from the receiving slot, a switch automatically turns full power onto the computer system thereby allowing a user full use of the computer without requiring an on/off button to be pressed. When the stylus is inserted back into the receiving slot, the switch automatically returns the computer to a power reduction mode where one or all of the components of the computer are powered down. Again, the power reduction mode is entered without requiring the user to press the on/off button. The switch can be made of a single detector or a dual detector combination and can be of a mechanical, electromagnetic, optical or electrical nature. In another embodiment, the stylus-based automatic power-up and power-down features work in concert with other power-up and power-down mechanisms of the computer, such power-on interrupts, the on/off button, and time-out power off modes. In another embodiment, the stylus is a hinge attached to a cover that can be rotated to protect the computer or rotated away to use the computer. When rotated to cover, the switch automatically powers down the computer. When rotated out for computer use, the switch automatically powers up the computer.

The invention belongs to the technical field of optical precision measurement, relating to super-resolution laser polarization differential confocal imaging method and device. The method improves the transverse resolution power by combining a radial polarized light and a pupil filtering technology, improves the axial resolution power by using a differential subtraction detection technology of an axial-offset dual-detector system and remarkably improves the spatial resolution power and tomography ability of the system. The device comprises a laser source as well as a beam expander, a polarization state modulation system, a pupil filter and a spectroscope which are sequentially arranged at a transmitting end of the laser source, an objective and a sample which are arranged in the transmitted light direction of the spectroscope in turn, and a differential confocal system in the opposite direction of the reflected light direction of the spectroscope. The invention combines the radial polarized light resolution technology with the pupil filtering technology and improves the transverse resolution power of the system; moreover, the differential work mode of the invention can remarkably improve the axial imaging ability of the system and is applicable to the high-precision detection and metering of nanometer-level geometrical parameters in the nanometer manufacturing field.

A double-radiant-source framework used for a container detecting system, which belongs to the technical field of radiation detection, having a horizontal accelerator, a vertical accelerator and a gantry tower composed of a left vertical girder, a right vertical girder, an upper cross girder, and a lower cross girder. A horizontal collimator and a vertical collimator are disposed in front of the frontal face each of the horizontal accelerator and the vertical accelerator. The horizontal collimator and the vertical collimator are fixed on the left vertical girder and the upper cross girder of the gantry tower, respectively. The radiation beams defined by the horizontal collimator and the vertical collimator are two planes oriented parallel to each other. A double-detector arm is disposed inside the right vertical girder of the gantry tower, and detector modules are disposed inside the double-detector arm for receiving the two different planes of radiation beams defined by and emitted from the horizontal collimator and the vertical collimator. Detector modules are disposed inside the upper cross girder and the lower cross girder respectively for receiving separately radiation beams defined by and emitted from the horizontal collimator and the vertical collimator. The container detecting system can reduce the area covered by the scanning channel of the system, and make the transportation, installation and use convenient, and improve the quality of the detected images.

The invention relates to a dual-detector segmenting gamma-scanning measuring device based on equivalent radius correction, belonging to the technical field of nuclear radiation measurement. The dual-detector segmenting gamma-scanning measuring device comprises a rotary table, a detector platform assembly, a transmission source platform assembly, a platform lifting and driving assembly, two same high-purity germanium detectors, a transmission source, a shielding part of the transmission source and an analysis module, wherein the two same high-purity germanium detectors are provided with collimators. In the invention, the influence of the nonuniformity of materials inside a wastebin is reduced through the constant rotation of the wastebin, layered measurement is carried out on the wastebin undergoing the constant rotation by placing the two same high-purity germanium detectors on different horizontal positions, the radial equivalent radius of each radionuclide layer is obtained through analysis, and the radionuclide activity of the radionuclide layer is accurately computed according to the detection efficient of the radial equivalent radius. Because an assumption of uniform radionuclide distribution is eliminated, the characteristics of an actual wastebin are better accorded with so that the measurement accuracy of the traditional segmenting gamma-scanning technology is greatly enhanced.

The invention relates to a two-way wave pre-stack depth migration method through a one-way wave operator. The two-way wave pre-stack depth migration method comprises the following steps that 1. an upper and lower dual detector seismic data acquisition system is adopted so that a detector wave field is formed; 2. seismic wavelet information is extracted so that a seismic source wave field is formed; 3. single-shot seismic data, a speed model and the seismic source wave field are read; 4. Fourier transform is performed on the seismic source wave field and the detector wave field in a time domain so that frequency-space domain wave field data are obtained; 5. depth continuation calculation is performed on the frequency-space domain wave field data; 6. migration imaging is performed by utilizing the principle of cross-correlation imaging or the principle of reflection coefficient imaging; 7. continuation calculation of the steps 4-6 is repeated to the maximum depth, the migration result is saved and the next shot of seismic data are calculated; and 8. the steps 3-7 are repeated to the last shot and a migration profile is outputted. According to the two-way wave pre-stack depth migration method through the one-way wave operator, full wave equation depth migration is performed by utilizing the one-way wave operator so that the rapid and accurate two-way wave depth migration algorithm is realized, and the method has more industrial utilization value.

The invention provides a novel three dimensional imaging system and the imaging method, two X-ray sources and two detectors are adopted, the two X-ray sources respectively move along rectilinear lead rails which are at an angle and arranged in a stagger way. The array of the detectors is fixed, and the detected object moves along a straight line vertical to the plane where the X-ray sources and the detectors are arranged. The imaging system and the imaging method can realize the actual three dimensional imaging, and have the advantages that the structure is relatively simpler, the objects to be detected or the X-ray sources and the detectors need not to rotate, the detection speed is fast, and the cargo transiting speed is faster, etc.; the invention has the potential of being applied to the rapid safety inspection field and the big object inspection filed. Compared with a single source and single line scanning structure, the invention can realize true three dimensional image detection, the image quality is obviously better than that of the single source and single line scanning structure.

The invention provides an integrated two-dimensional fiber optic micro accelerometer based on a four-core fiber optic, which is formed by connecting light sources the wave lengths of which are 1310nm and 1550nm respectively, a wavelength division multiplexer, a circulator, a single-core fiber optic, a fiber optic sensing probe and a dual detector, wherein the fiber optic sensing probe comprises a four-core fiber optic, an external shell, mass blocks and a support, wherein each fiber core is carved with fiber optic gratings serving as reflectors; resonance wavelengths of the two orthotropic fiber optic grating pairs are 1310nm and 1550nm respectively; the single-core fiber optic and the four-core fiber optic are connected by utilizing a fiber optic coupler; the single-core fiber optic and the shell are rigidly connected; the mass blocks and the four-core fiber optic are connected and fixed; the mass blocks are fixed at the positions of the four fiber optic gratings; and the four-core fiber optic is fixed with the external shell by the support. The invention is beneficial to the miniaturization and the integration of sensors, can realize the acceleration measurement in the two-dimensional direction, has simple, convenient and feasible manufacture method and can achieve the goal of temperature compensation.

An improved image acquisition system allows the angular displacement between two detectors to be adjusted between 90° and 180° to reduce the imaging time for both 360° and 180° scans. A patient table is displaced vertically and horizontally from a lateral axis to allow the body of a patient to be positioned next to the detectors and to improve resolution.

Embodiments of the present invention is directed to a method and system for use of ranging MW to reduce dual (MW/PIR) intrusion detector false alarms. A Doppler microwave system may be provided that is capable of detecting an object range and adjusting the sensitivity of the PIR detector to account for object size and range. Multiple range limited MW stages may be configured for different ranges to determine the general range of the moving object. Based on signal levels present on these MW stages, an approximate object range is determined. The sensitivity of the PIR is then adjusted based on a PIR sensitivity vs. object range function that is optimized to alarm on humans and ignore small animals and insects.

The invention relates to a parking space geographic information collection and parking space detection method based on a roadside packing lot. The parking space geographic information collection and parking space detection method is characterized by including the following steps that the parking space geographic information collection function is achieved through parking space number records which are generated in a background server and bound with space physical locations; parking space detection is conducted through the parking space records bound with the space physical locations and through parking space detectors which are installed near sidelines on the two sides of each parking space. By collecting the longitude and latitude coordinate values of the center point of each parking space and generating the parking space number records bound with the longitude and latitude coordinate values of the center point of each parking space in the background server, parking space detection is conducted through the public detectors which are adjacent in space physical locations with an intersection effect method, for the non-public detectors which are not adjacent in space physical locations, respectively independent dual detectors are adopted for detection and judgment, and therefore limitation and one-sidedness of parking space detection through the two parking space detectors on the sidelines beside one parking space are overcome, and detection accuracy is improved.

The invention discloses a high-precision resonant optical voltage sensor and a detecting method and belongs to the technical field of optical voltage sensing. The optical voltage sensor comprises a narrow linewidth laser source, a Y waveguide, a BGO crystal, dual detectors and a signal detection circuit which are sequentially connected through polarization maintaining optical fibers. The front light transmitting surface and the rear light transmitting surface of the BGO crystal are coated with films to form a high-definition resonant cavity, and the Pockels effect is improved through multiple times of transmission of light in the resonant cavity. According to the detecting method of the optical voltage sensor, by means of a resonant light path for dual path tracking, the resonant frequency difference of the two beams of light is synchronously detected, interference caused by the temperature change of the two beams of light at the same moment is consistent, the interference variables of the two beams of light in the propagation process are offset, and the improved Pockels effect is reserved. The measuring precision, temperature stability and environment adaptability of the optical voltage sensor are improved, the contradiction of high precision of miniaturization of the voltage sensor is solved, light path devices are reduced, and the structure is simple and reliable.

A gamma camera based on dual-detector technology comprises an encoder plate, a shielding body, a readout circuit, a data processing circuit, a reconstruction circuit, a position sensitive detector, anenergy sensitive detector and an optical camera. After a gamma ray emitted from a radioactive material to a detection area is encoded by the encoder plate, the position sensitive detector collects and generates the projection data and a first energy spectrum data set, the energy sensitive detector collects and generates a second energy spectrum data set, the data processing circuit receives the first energy spectrum data set and the second energy spectrum data set to obtain combined energy spectrum data, the reconstruction circuit obtains a gamma radiation image according to the projection data and the combined energy spectrum data, the optical camera acquires a visible light image. The visible light image is integrated with a two-dimensional radiation image generated by the gamma cameraso as to achieve accurate registration and fusion of two modal images. Energy spectrum analysis is performed by using the combined energy spectrum data such that a high-resolution energy spectrum is obtained, and nuclide identification is performed based on a built-in nuclides library.

The invention provides a device and a method for distance and speed measurement adopting scanning laser signals and a dual detector. The device comprises a transmitting unit and a receiving unit. The transmitting unit is mounted on an object A; and the receiving unit is mounted on an object B. The relative distance and the relative speed between the object A and the object B can be measured. The transmitting unit comprises a laser linear source, an N prism with a principle section of an N-sided polygon and a motor which can drive the N prism to rotate; and the receiving unit comprises at least two photoelectric detectors and a single-chip microcontroller. The N prism is driven to rotate by the motor; and laser transmitted from the laser source is reflected by lateral sides of the N prism to the receiving unit, and is received by the photoelectric detectors successively. Back waves are not required on the technical scheme which can be applicable to objects in relative motions; tracking measurement and continuous measurement can be performed; and the device can further be applicable to objects moving at low speed, and is wide in application.

An improved image acquisition system allows the angular displacement between two detectors to be adjusted between 90.degree. and 180.degree. to reduce the imaging time for both 360.degree. and 180.degree. scans. A patient table is displaced vertically and horizontally from a lateral axis to allow the body of a patient to be positioned next to the detectors and to improve resolution.

A method for automatically orienting passive motion detection sensors in a given area, the method including capturing an image of at least a first portion of the given area, and responsive to capturing of an image of the first portion of the given area, superimposing, onto the image, a multiplicity of virtual passive sensor sensitivity beams virtually originating from at least one passive motion detection sensor, the at least one passive motion detection sensor being operable for passively detecting motion in at least a second portion of the given area, the sensitivity beams demarcating the second portion of the given area, thereby enabling ascertaining a measure of overlap between the first and second portions of the given area.

A method for fluorescence detection that provides control of experimental and molecular factors and reliably predicts of concentration from fluorescence intensity measurements utilizing capillary-based flow sensors utilizing a dual detector approach to provide instantaneous normalization of the fluorescent intensity by the Rayleigh scattered intensity measured from the same sensing volume, insensitive to various experimental parameters for prediction of absolute concentrations of fluorescent solutes.

A range sensor using structured light intensity for determining displacement measurements. A micro-lens array or diffractive optical element inputs light from a light source and outputs a flattop intensity pattern in a diverging light stripe. By using a diverging light stripe, the response of the system to a change in position is made to vary approximately proportionally to the inverse of a distance from a reflecting surface to the source of the diverging light stripe. A dual detector approach may be utilized to eliminate the sensitivity of measurement signal with respect to variations in the optical power the light source, as well as other potential variations.