92results about How to "Suppresses measurement errors" patented technology

A radar device mounted in a moving object includes a radar transmitter and a radar receiver. The radar receiver includes a plurality of antenna brunch processors that perform correlation processing of the received returning signals and the radar transmission signal, and generate respective correlation signals each including arrival delay information of each of the received returning signals, an electric power profile generator that generates an electric power profiles for each arrival direction of the received returning signals and Doppler frequency component, using the generated correlation signals, and a stationary object group distribution generator that, based on the generated electric power profiles, obtains a first distribution of a Doppler frequency components of a stationary object group including a plurality of stationary objects as the plurality of targets in the perimeter of the moving object, for each azimuth angle.

A gas detection system capable of suppressing the power consumption of the system using gas sensors required for heating for measurement at high accuracy, comprising a server and a plurality of gas sensors connected by way of wireless communication with the server, in which each of the gas sensors is provided with a heater, a controller for controlling the ON-OFF for the power supply to the heater and a comparator for comparing the detected gas concentration with a predetermined threshold value. In the gas detection system, electric power is not usually supplied to the heater in each of the gas sensors and the gas sensor measures the gas concentration at a low accuracy and always compares it with the threshold value. In a case where the gas concentration exceeds the threshold value in one of the gas sensors, it turns the heater of its own to ON thereby switching the measurement to that at high accuracy and turns the heater to OFF upon completing the measurement. At the same time, it informs the detection for the excess of threshold value to the server and the server lowers the threshold value of the gas sensors in the vicinity of the gas sensor that has informed the detection for the excess of threshold value to make the monitoring level severer.

A method of monitoring deterioration of lubricating oil and a device therefore capable of judging deterioration of the oil with high accuracy suppressing measurement error due to mixing of foreign matter in the oil. Correlation between relative permittivity and TBN (total base number) of the lubricating oil is obtained beforehand (step S1), electric current and voltage are measured (step S2) when high-frequency voltage is applied between a pair of electrodes located in an oil path in a gas engine, permittivity of the oil is detected (step S3) based on the measurement of current and voltage, TBN of the oil is obtained (step S4) from the correlation between relative permittivity and TBN, and deterioration of the oil is judged by the obtained value of TBN.

The present invention discloses a multi-wavelength tunable micro-interference measuring method and a device thereof. A multi-wavelength tunable laser is modulated to output three paths of wavelength tunable laser signals in the synchronous or time-sharing manner. The three paths of wavelength tunable laser signals are compounded as one path of composite laser signals through beam-combining optical fibers, and the path of composite laser signals is focused and coupled to the surface of a frosted glass plate which is rotating at a constant speed. After that, the path of composite laser signals is incident to the surface of a beam splitter after being formed as the parallel light through a collimating beam-expanding lens. The light is reflected to enter an interference microscope, and then is irradiated onto the surface of a to-be-tested element on an objective table. A reflected signal sequentially passes through the objective lens of the interference microscope and the beam splitter to be coupled to the target surface of a color camera through an imaging lens. Finally, output signals are regulated and acquired data are synchronously controlled by a computer. According to the technical scheme of the invention, a plurality of different wavelengths are adopted by a single-wavelength tunable laser module, so that the optical phase shift and the multi-wavelength interference detection are realized. The method and the device are especially suitable for the fast and accurate measurement of microstructure elements which are complex and non-continuous in surface shape variation. Therefore, measurement errors, caused by the scanning motion of a mechanical component, can be effectively inhibited.

A color luminance meter 1 is provided with a polychrometer 4 as a spectral optical system including a light receiving sensor array 43, a signal processing circuit 5 and an operation control unit 6. The operation control unit 6 carries out calculations to obtain characteristics of a measurement light based on a specified spectral responsitivity, using light reception signals and specified weighting coefficients. The spectral responsitivities of light receiving sensors constructing the light receiving sensor array 43 are selected such that B≧5 nm and A/B lies within a range of 1.5 to 4.0 when A, B denote the half power band width of the spectral responsitivities and a center wavelength interval of the spectral responsitivities. Accordingly, there can be provided a light measuring apparatus capable of maximally suppressing errors to highly precisely measure color luminance values and the like even in a measurement of a light lying in a narrow band such as a monochromatic light.

The invention discloses an infrared detecting device and method for target recognition in a sea surface sun bright band. According to the infrared detecting device, the lenses of two middle infrared cameras form an angle; an infrared polarizer is arranged in front of the lens of a middle infrared camera; a wire gating polarization device is arranged at the light path intersection in front of the lenses of two middle infrared cameras; a diaphragm is arranged on the light path in front of and the wire gating polarization device; a germanium sealing window is arranged in front of the diaphragm; the germanium sealing window and a temperature control hood form a sealed temperature control cavity; and the middle infrared cameras, the infrared polarizer, the wire gating polarization device and the diaphragm are arranged in the temperature control cavity. When detection is carried out, the system of the infrared detecting device is calibrated; the image of the sea surface sun bright band is collected; and target recognition is finally realized after image processing. According to the invention, the image gray scale difference between the target and the surrounding sea area is improved; equal gray-scale massive sea area appearing in the bright band sea area is reduced; and the target recognition ability in the sea surface sun bright band is improved.

Each of three magnetic sensors is positioned on a first virtual line that passes the centers of two magnetic shields in the width direction and is perpendicular to a virtual plane, so a value detected by the magnetic sensor is less likely to be influenced by an external magnetic field. The first virtual line and the center of a conductor intersecting the first virtual line are separated from each other by a certain distance. Therefore, even if a distance from the center of the conductor in the width direction to the magnetic sensor is short, it is possible to improve, on a high-frequency side, frequency characteristics in the detection sensitivity of the magnetic sensor for the frequency of the current under measurement.

The invention discloses a snapshot-type full-field white light interference microscopic measurement method and device. On the basis of a white light interference microscopic measurement method and a snapshot-type spectral imaging detection technology, compound color parallel light passes through an axial dispersion-type interference optical system to be sequentially dispersed axially, the dispersed light is correspondingly focused at different axial depth positions, and the intensity of a white light interference signal in the spectrum domain changes with the wavelength, and reaches a maximumvalue nearby one monochromatic focal plane of the axial dispersion; the unique coding among the white light interference signal, spectrum and depth required by the measurement is built, and only multi-frame or single-frame snapshot-type dispersion spectrum coding white light interference image is required for achieving the non-mechanical scanning, full-field non-contact and quick (dynamic and eveninstant) high-precision measurement of the three-dimensional shape distribution of a detected part.

A pressure sensor comprising: a sensor chip; a differential pressure diaphragm provided in the center portion of the sensor chip; a differential pressure gauge provided in the differential pressure diaphragm; a static pressure diaphragm provided at the outer peripheral portion of the differential pressure diaphragm; a first static pressure gauge formed at an edge portion of the static pressure diaphragm; and a second static pressure gauge formed at a center portion of the static pressure diaphragm.

The invention relates to a distance automatic measuring method of wireless network nodes. The method comprises the steps that: a ZigBee communication network is established; anchor nodes periodically broadcast IDs and position information of their own; a mobile node stores an RSSI average value of the anchor nodes participating in node distance calculation; groups of the anchor nodes participating in node distance calculation are established; a distance measuring factor A and an attenuation factor n of each group are calculated; and the distance measuring factor A and the attenuation factor n are utilized to calculate distances between the anchor node members and the mobile node. By adopting the method provided by the invention, the adaption capability to the wireless network environment change is increased, the distance measuring error is lowered, and the positioning precision of the wireless network nodes is improved.

A positioning apparatus which positions a stage (7) includes measurement systems which measure the position of the stage (7), and a correction unit (15) which corrects, on the basis of the acceleration of the stage (7), the values measured by the measurement systems (3, 4).

A stator (42) is hooked in a frame body (10) away with a prespecified space from a spindle (2), so that it is not necessary to fix the stator with a screw. The stator (42), therefore, can easily be mounted, and further as it is not necessary to provide a screw hole in the frame body (10), so that the need for waterproofing processing associated with a screw hole is eliminated. Further the stator (42) is hooked in a protrusion (53) of an electronic unit (50) inside the frame body (10) away with a prespecified space from the spindle (2), so that a rotation thereof in the peripheral direction of the spindle due to play and rattle is small and a measurement error can be suppressed.

The invention relates to an electrical fire detector based on temperature detection. The electrical fire detector is provided with a constant flow source for a temperature measurement circuit, and the constant flow source comprises a digital analog converter (DAC) input module, a first summator circuit, a differential input operational amplifying circuit, a second summator circuit, a reverse amplifying circuit and a metal oxide semiconductor field effect transistor (MOSFET) switching circuit; an input end of the first summator circuit is connected with an output end of the differential input operational amplifying circuit and an output end of the second summator circuit, and an output end of the first summator circuit is connected with a grid electrode of a MOSFET; an input end of the reverse amplifying circuit is connected with the output end of the differential input operational amplifying circuit, and an output end of the reverse amplifying circuit is connected with an input end of the second summator circuit; the DAC input module is connected with the input end of the second summator circuit; and a same direction input end of the differential input operational amplifying circuit is connected with a source electrode of the MOSFET, and a reverse input end of the differential input operational amplifying circuit is grounded. According to the electrical fire detector, by means of the constant flow source for the temperature measurement circuit, four operational amplifying circuits are used for achieving double closed-loop dual feedback control, the accuracy of constant current is high, the responding speeds are high, and the generality is good.

Described here are a device and a method for detecting the presence of a biomarker using the device, wherein the device comprises (a) a substrate comprising a plurality of electrodes; (b) a plurality of nanowire field-effect transistor sensors integrated or assembled on the substrate and connected to the electrodes; and (c) a microfluidic component disposed on the substrate and adapted to communicate fluidically with the nwFET sensors.

The invention belongs to the technical field of optical precision measurement and relates to a reflective stripe three-dimensional shape measuring method based on multi-field view splice. According tothe method, multiple cameras are used for measuring the three-dimensional shape of different parts of the tested piece at the same time, to solve the problem of incomplete measuring data of the single camera caused by the self-shielding of the curved surface. In order to ensure that the coordinate system of the plurality of camera measuring data is consistent, the invention uniformly corrects multiple cameras and strip display screens to establish a unified spatial coordinate system. In addition, the invention corrects the fine inclination and the motion error between the measuring data of each camera by utilizing fine beam labeling method and the like to further improve the measuring precision. The invention integrates the multi-camera and multi-field synchronous measuring idea into thereflective strip three-dimensional shape measuring technology with high-reflective surface for the first time, which has the advantages of high measurement precision, fast measurement speed and stronganti-environment interference capability, and can be used for rapid three-dimensional shape measurement on a high-reflective surface with large bending degree.

The invention provides a gas online analysis device based on an optical integrating sphere. The device mainly comprises a sampling unit, a pre-processing unit and an integrating sphere measuring unit, wherein an integrating sphere of the integrating sphere measuring unit mainly comprises a transparent substrate, a diffuse reflection layer, diaphragms and air ports; the outer side of a spherical cavity formed by the transparent substrate is coated with the diffuse reflection layer; an incident light path and an emergent light path intersect in a coplanar manner; incident light in the integrating sphere is reflected by the diffuse reflection layer multiple times and acts with a sample to generate a characteristic spectrum inside the integrating sphere; and the generated characteristic spectrum is superposed on the emergent diaphragm and is effectively received after being reflected by the diffuse reflection layer multiple times. The gas online analysis device has the effects that measuring errors caused by changes of light shapes and divergence angles can be also effectively inhibited by utilizing the integrating sphere; and under the condition of equivalent line diameters, the sensitivity and stability of traditional cylindrical gas chambers can be improved by 3-10 times.