278results about How to "High precision measurement" patented technology

A device rotates at least one static magnetic field about an axis, producing a rotating magnetic dipole field, and is movable in relation to the surface of the ground. The field is periodically sensed using a receiver to produce a receiver output responsive to the field. A positional relationship between the receiver and the device is monitored using the output. In one aspect, changing the positional relationship, by moving the device nearer to a boring tool which supports the receiver, causes an increase in accuracy of depth determination. In another aspect, determination of an actual overhead position of the boring tool, and its application, are described. Use of a plurality of measurements over at least one-half revolution of each magnet is disclosed. Establishing a surface radial direction toward a boring tool and resolution of multi-valued parameters is described. Calibration techniques, as well as a three transmitter configuration are also described.

The car battery system of the present invention is provided with a battery block 2 that retains a plurality of battery cells 1 in a stacked configuration and has a terminal plane 2A, which is coincident with terminal surfaces 1A established by positive and negative battery cell 1 electrode terminals 13; and with a battery state detection circuit 30 that connects with the electrode terminals 13 of each battery cell 1. The battery system is provided with a circuit board 7 with surface-mounted electronic components 40 that implement the battery state detection circuit 30. The circuit board 7 is a single-sided board with electronic components 40 mounted on only one side, and the circuit board 7 is attached to the battery block 2 opposite the terminal plane 2A with the side having no electronic components 40 facing the battery block 2. The positive and negative electrode terminals 13 of each battery cell 1 are connected with the circuit board 7 for connection to the battery state detection circuit 30.

A semiconductor leakage current detector of the present invention includes a first analog switch which causes a current to be measured to flow or to be cut off, a second analog switch which causes a reference current to flow or to be cut off, an integral capacitance element which is connected by the first analog switch and the second analog switch and is charged with the current to be measured or the reference current, a discharge unit which discharges the integral capacitor, and a comparison unit which compares the reference voltage with each of an integral voltage generated in the integral capacitor by a reference current after the discharge of the integral capacitor and an integral voltage generated in the integral capacitance element by the current to be measured after the discharge of the integral capacitor

The present invention provides a current sensor capable of sensing a current to be detected with high precision. The current sensor includes a bus line which extends in an X direction at a first level and to which a current to be detected is supplied, a first magnetoresistive element extending in the X direction in a region corresponding to the bus line at a second level, and a second magnetoresistive element extending in the X direction in a region corresponding to the bus line at a third level. The resistance value of the first magnetoresistive element and that of the second magnetoresistive element change in directions opposite to the second level in accordance with a current magnetic field generated by the current to be detected. With the configuration, the first and second magnetoresistive elements and the bus line can be disposed close to each other. While realizing compactness, the current magnetic field can be detected with high sensitivity.

A sensor system immersible in an ambient-fluid for sensing at least two conditions of the ambient fluid, includes a sealed chamber filled with a reference fluid of a known composition and/or pressure, and two acoustic transmission channels, one including the reference fluid, and the other including the ambient fluid. Measuring circuitry measures (a) the transit time of an energy wave through one transmission channel to determine the temperature of the fluid within the sealed chamber and thereby the temperature of the ambient fluid; and (b) the transit time of an energy wave through the other transmission channel to determine the composition and/or the pressure of the ambient fluid.

An image display device includes: an optical modulation element having a plurality of pixels; light sources illuminating the optical modulation element, each of which is independently controlled; a light source control value setting section setting control values for each of the light sources according to the grayscale of each pixel of an input image; optical sensors provided on areas of “n” pixels, respectively, where the “n” is an integer equal to or greater than 1; an illumination detection section detecting the illumination of the areas by the optical sensors; and a grayscale control section processing to correct grayscale of each pixel based on the detected illumination and controlling the optical modulation element according to the corrected grayscales obtained by correction.

A rotational angle-measurement apparatus with high accuracy is provided through the electric correction of the rotational angle-measurement apparatus by rotating the rotation shaft at a constant speed.

The present invention aims to provide an intra-oral measurement device and an intra-oral measurement system capable of measuring an inside of an oral cavity at high accuracy without increasing a size of the device, and includes a light projecting unit for irradiating a measuring object including at least a tooth within an oral cavity with light, a lens system unit for collecting light reflected by the measuring object, a focal position varying mechanism for changing a focal position of the light collected by the lens system unit, and an imaging unit for imaging light passed through the lens system unit.

In a distance measurement device of the invention, a light divider separates pulsed light emitted from an ultrashort pulse fiber laser into reference light A and signal light. A scanning mirror unit irradiates an object with the signal light as a division of the pulsed light and receives scattered light B, which is reflected from the object irradiated with the signal light. An optical path length adjustment unit adjusts an optical path length of the reference light A as a division of the pulsed light. A differential detector included in an interference signal generator detects the degree of interference of the reference light A having the adjusted optical path length with the scattered light B and outputs the detected degree of interference as an interference signal. A computer specifies an adjustment value set in the optical path length adjustment unit to attain a specific optical path length maximizing the interference signal and uses the specified adjustment value to compute a distance from a reference position of the scanning mirror unit to the object. The distance measurement device of the invention thus enables high-speed and highly-accurate measurement of the object.

The invention discloses a high-accuracy remote absolute displacement measurement system based on optical fiber composite interference, which belongs to the technical field of optical measurement and is composed of a board band light source, an optical fiber isolator, three 3dB couplers, four auto-collimation mirrors, two optical fiber gratings, four reflectors, two detectors, a circulator, a one-dimensional translation platform, piezoelectric ceramics, a feedback control circuit, a signal generator, a signal treatment circuit, an analog to digital (A/D) conversion card, a computer and result output. The high-accuracy remote absolute displacement measurement system uses an optical fiber interferometer to induce displacement and another optical fiber interferometer to demodulate displacement to achieve remote measurement. The optical fiber interferometer for demodulation works in a low coherence interference state and a high coherence interference state, and amplitude of displacement can be determined by low coherence signals to achieve absolute measurement. A value of the displacement can be measured by high coherence signals to feed back and control effects of environment interference on the demodulating optical fiber interferometer, and high-accuracy measurement can be obtained.

An electrostatic latent image measuring device includes a charged particle optical system which irradiates an electron beam and charges a photoconductor sample, an exposure optical system which forms an electrostatic latent image on a surface of the photoconductor sample, and a scanning unit which scans the surface of the photoconductor sample by the electron beam, a distribution of the electrostatic latent image on the surface of the sample being measured by a signal detected by the scanning.

A three-dimensional shape measuring system includes: a light projecting/receiving apparatus which causes a light receiver to receive light reflected on a surface of a measurement object onto a light receiving surface thereof at a predetermined cycle multiple times, while changing a projecting direction of the light; and a measuring apparatus for measuring a three-dimensional shape of the measurement object, utilizing light receiving data. The measuring apparatus includes: a light receiving time setter for setting a light receiving time in each cycle with respect to each of light receiving areas constituting the light receiving surface; a data converter for converting an output value representing the light receiving data obtained in each cycle into an output value standardized with respect to the light receiving time in each cycle, if the light receiving times are different in the cycles; a projection timing acquirer for acquiring a projection timing at which the light receiving amount of each light receiving area is maximum; and a position acquirer for acquiring a position of a measurement point on the surface of the measurement object corresponding to each light receiving area.

A lighting apparatus is provided which includes a drive section which applies electric current to a light source which is a semiconductor element emitting light with application of electric current, at least one heat sink which is mounted with the light source and transfers heat generated by the emission of the light source, and a temperature measurement section which is mounted to the heat sink and measures temperature of the heat sink which is used for estimating temperature of the light source. The light source and the drive section are mounted to the same heat sink or to the heat sinks which are thermally coupled to each other.

The invention discloses a fiber bragg grating (FBG) testing device and a testing method for rock three-dimensional stress state. The testing device comprises a data processing module consisting of an FBG network demodulator and a computer, three FBG sensors and a substrate for mounting the FBG sensors; the substrate can be deformed with the deformation of rocks; the three FBG sensors are respectively fixed in three-dimensional directions on the surface of the substrate; and the signal output ends of the three FBG sensors are connected with the signal input ends of the FBG network demodulator. The invention can measure the deformation amount of microstrain, so responses can be made in time before rock masses are damaged; the high-precision measurement of three-dimensional stress in rocks can be realized, so that the long-term and effective monitoring for large project rock masses can be realized, and disasters are prevented.

(A device) Attached to the nostrils and/or the mouth of a test subject, comprises a respiratory sensor that detects the air pressure changes due to breathing in and breathing out air from the nostrils or the mouth during respiration, and a respiratory information analyzing means that analyzes respiratory information from the information of the air pressure changes detected by the respiratory sensor.

A rotational misalignment between semiconductor wafers constituting a bonded wafer is calculated. A light source is arranged at a position which is on a front side of an opening of a notch and which is separated from an outer edge portion of a bonded wafer by a predetermined interval, and outputs light to irradiate the outer edge portion of the bonded wafer including the notch. A camera receives and photoelectrically converts reflected light that is specularly-reflected by the outer edge portion of the bonded wafer including the notch among the light outputted by the light source in order to output a brightness distribution of the reflected light as an image. A computer analyzes positions of notches from the image outputted by the camera to obtain a notch position misalignment, and further calculates a rotational misalignment between semiconductor wafers using a center position misalignment between the semiconductor wafers.

The present invention is a wafer polishing method including simultaneously polishing both surfaces of a wafer by pressing and rubbing the wafer, while holding the wafer with: a lower turn table having a flat polishing-upper-surface rotationally driven; an upper turn table having a flat polishing-lower-surface rotationally driven, the upper turn table being arranged with facing to the lower turn table; and a carrier having a wafer-holding hole for holding the wafer, wherein the polishing is performed while measuring a thickness of the wafer through a plurality of openings provided between a rotation center and an edge of the upper turn table or the lower turn table, and switching a polishing slurry with a polishing slurry having a different polishing rate during the polishing of the wafer. As a result, there is provided a wafer polishing method that can manufacture a wafer having a high flatness and a high smoothness at high productivity and high yield.

A sensor element (30) measures a Hall voltage generated by a movable magnet (16). For this purpose, the sensor element (30) comprises a ceramic base element (40) which has connected therewith a detector element (46). The detector element (46) is protected with the aid of a cover element (42) against an aggressive environment produced by fuel or fuel vapors in a fuel tank (34) of a motor vehicle. The detector element (46) has connected therewith electric conductors (60) which are routed through the cover element (42) and/or the base element (40) for connecting the detector element (46) with a voltage source and/or an evaluation unit. The cover element (42) and possibly the base element (40) reliably encapsulate the detector element (46) against the aggressive environment such that by simple constructive measures the service life of the sensor element (30) is increased.

A position measuring apparatus includes a holder having storage spaces in which a three-point support member for supporting a backside of a substrate being a mask at three points, and a vacuum chuck member for holding a backside of a substrate being a mask are prepared, a stage on which one of the three-point support member and the vacuum chuck member prepared in the storage spaces of the holder is mounted, a vacuum pump to hold and chuck the substrate through the vacuum chuck member in a state of being mounted on the stage, and a recognition unit to recognize a position of a pattern written on the substrate supported by the three-point support member mounted on the stage and a position of a pattern written on the substrate held by the vacuum chuck member on the stage.

A method measuring the birefringence of an object. A measurement beam having a defined input polarization state is generated, the measurement beam being directed onto the object. Polarization properties of the measurement beam after interaction with the object are detected in order to generate polarization measurement values representing an output polarization state of the measurement beam after interaction with the object. The input polarization state of the measurement beam is modulated into at least four different measurement states in accordance with a periodic modulation function of an angle parameter α, and the polarization measurement values associated with the at least four measurement states are processed to form a measurement function dependent on the angle parameter α. A two-wave portion of the measurement function is determined and analysed in order to derive at least one birefringence parameter describing the birefringence, preferably by double Fourier transformation of the measurement function.

A voltage between both terminals of each unit battery is amplified by a differential amplifier and is then converted by a converter into a predetermined physical quantity that corresponds to the voltage between both terminals of the unit battery. The converted physical quantity is then level-shifted by a detection circuit and is converted into a voltage on a reference potential of the lowest electric potential of the battery assembly. A control unit sequentially selects the converted voltages by a multiplexer, generates serial digital signals by an A/D conversion, and then transmits the serial digital signals to a control operation unit via an isolation buffer circuit. It is, therefore, possible to provide a battery voltage measurement circuit capable of measuring a voltage of each of unit batteries constituting a battery assembly with high accuracy by using a common measurement circuit in a relatively simple and inexpensive configuration.

The invention provides a property monitoring apparatus comprising a test current output circuit capable of varying an output current, a test current value computing means for computing a current value of a test current output from the test current output circuit, a test current control means for performing feedback control of the test current value computed via the test current value computing means to a target value, a measurement current detection circuit for measuring an output current value of the current transformer or the voltage transformer when the test current controlled to the target value via the test current control means is supplied, for storing a relationship between the output current value of the current transformer or the voltage transformer and the test current value for each target value by varying the target value of the test current via a predetermined pattern, and computing a correction coefficient for correcting a property of the current transformer or the voltage transformer based on the stored relationship.

The present invention provides a method of using an accurate three-dimensional shape without damaging a sample by making a probe contact the sample only at a measuring point, lifting and retracting the probe when moving to the next measuring point and making the probe approach the sample after moving to the next measuring point, wherein high frequency/minute amplitude cantilever excitation and vibration detection are performed and further horizontal direction excitation or vertical/horizontal double direction excitation are performed to improve the sensitivity of contacting force detection on a slope of steep inclination. The method uses unit for inclining the probe in accordance with the inclination of a measurement target and a structure capable of absorbing or adjusting the orientation of the light detecting the condition of contact between the probe and sample after reflection on the cantilever, which varies a great deal depending on the inclination of the probe.

A defective recording element correction parameter selection chart which is output by an image forming apparatus that performs image formation on a recording medium by a plurality of recording elements included in a recording head while conveying at least one of the recording head and the recording medium so as to cause relative movement between the recording head and the recording medium, the chart being used, in a case where there is at least one defective recording element which is not able to perform recording among the plurality of recording elements, in order to determine a defective recording element correction parameter expressing an amount of correction for correcting image formation defects caused by the at least one defective recording element, with image formation by a recording element other than the at least one defective recording element, the chart includes: a reference patch constituted by a uniform image which is an image formed on a region of the recording medium with a uniform density based on a constant tone; and at least one measurement patch in which a state after correction using the amount of correction corresponding to a candidate value of the defective recording element correction parameter which expresses the amount of correction is reproduced in a state that one or more of the recording elements which have formed the reference patch are set to be in a non-recording state, the candidate value of the defective recording element correction parameter being applied to an image formation portion which is formed by a recording element that carries out recording in a vicinity of a non-recording position of the one or more of the recording elements which have formed the reference patch and have been set to be in the non-recording state.

The invention discloses a method for measuring simulated seabed terrain based on an active stereo vision technology and measuring equipment. By the stereo vision technology, a binocular camera is arranged on the outside of an experimental trough, and seabed terrain changes are measured contactlessly through glass sidewalls of the experimental trough. Partial flow field will not be disturbed, and synchronous acquisition of the whole simulated seabed terrain can be realized. According to the invention, the active vision technology is used in underwater measurement. That is to say, by the utilization of auxiliary structured light irradiating underwater terrain through the glass sidewalls of the experimental trough, dense structured textures or dot arrays are formed on the terrain such that the camera can distinguish more easily. Meanwhile, quantity of terrain characteristic points is also increased. With the combination of the high-resolution camera, high-precision terrain data can be obtained. By the adoption of the method provided by the invention, noncontact, synchronous and high-precision measurement of the simulated seabed terrain can be realized, and corresponding problems existing in the prior art are solved.

The method for measuring the concentration of the measuring object uses a sensor chip comprising an optical waveguide layer and an antibody immobilized layer formed on the surface of the optical waveguide layer, which comprises immobilizing the measuring object and an enzyme-labeled antibody labeled with a labeling enzyme on the antibody immobilized layer of the sensor chip having an immobilized antibody, producing a color-developing and precipitating enzyme reaction product by allowing to react a coloring reagent with the labeling enzyme on the antibody immobilized layer to precipitate the enzyme reaction product on the antibody immobilized layer, allowing to totally reflect a light impinged on the sensor chip from the outside at an interface between the optical waveguide layer and the antibody immobilized layer, and observing to a physical value of the totally reflected light.

The invention discloses a laser adjustable multipurpose measuring device and a measuring method thereof. The measuring device comprises an adjustable laser transmitter mounted on a machine tool, transition sleeves arranged in two ends of a measured hole, a forward laser receiver and a reverse laser receiver which are respectively arranged in the transition sleeves. The method comprises the following steps: firstly, levelling the base plane of the measured hole and the machine tool; fixing the adjustable laser transmitter on a main shaft of the machine tool; regulating the laser beam of the laser and the stretching direction of the main shaft of the machine tool on the same straight line; moving the main shaft of the machine tool to the approximate central position of the measured hole; inserting the forward laser receiver and the reverse laser receiver into the transition sleeves; and then inserting the transition sleeves to two sides of the measured hole, and respectively reading thenumerical value of the forward laser receiver and the reverse laser receiver, thus the verticality or concentricity of the measured hole relatively to the base plane is obtained. According to the invention, the verticality of a deep hole and the base plane and the concentricity of the stretching direction of the main shaft of the machine tool and the hole axis line can be convenient and efficientto measure on line and the product quality can be ensured.

This invention belongs to a laser radar domain, which relates to a continuous wave frequency modulation cohere laser radar which is on the basis of optical fiber laser device. Optical fiber laser device is used as light source, of which launching wnd links optical fiber coupler. Optical fiber coupler divides energy of light into two parts. Moiety is used as characteristics light, which can be directly inputted in an input end of secondary optical fiber coupler, the other part is inputted in expanding bunch lens device; after expanding bunch lens compresses laser emission angle, direct surveyed area by 2-dimensional scanner; echo-signal is feed-through one end of transmission optical fiber through optical antenna by 2-dimensional scanner, the other end of transmission optical fiber contacts secondary optical fiber coupler by optical fiber amplifier. After echo-signal and characteristics light are combined and interfered to mix frequency by optical fiber coupler, enter monitor component element. Monitor component element can transform and magnify signal photoelectricity, output, post it in computer by collecting card, carry out data processing. This invention has features of small volume, light quality, high integrated degree, good stability, intelligentification and modular.

A modular hardness testing machine has a measuring component and a set of frames. The measuring component includes a housing and locating slot. The measuring component has a locating slot configured to receive a frame. The locating slot allows a user to modularly interchange the frame. The measuring component's housing encloses a presshead, which encloses a load cell having through-holes holding transmission pins. The first end of each transmission pin contacts a displacement measurement sleeve, and a second end contacts a transmission plate. A motor is mounted to the housing. The motor is connected to a reduction drive. The reduction drive reduces speed and drives a lead screw mounted on a bearing mount, and a moveable presshead is driven by the lead screw.

A gas sensor capable of a high-accuracy measurement which is realized by a high responsiveness and a strength that prevents a sensor element from being damaged by a stress occurring in assemblage and usage. This gas sensor includes a sensor element formed of an oxygen-ion conductive solid electrolyte as a main component, and the sensor element includes: an internal space to which a measurement gas is introduced from the outside; a first electrode formed on a surface of the internal space; a second electrode formed in a space different from the internal space; and a pumping cell including the first and second electrodes. The pumping cell is operable to pump out oxygen existing in the internal space when a predetermined voltage is applied to between the first and second electrodes. The thickness of the internal space is 50 μm or more and 180 μm or less.