61results about How to "Maintain measurement accuracy" patented technology

A physiological signal measuring sensor that minimizes the measurement error due to a soldering tolerance during the manufacturing process, and a manufacturing method for the same is disclosed. The physiological signal measuring sensor includes a printed circuit board, a light receiving chip mounted to the upper surface of the printed circuit board, light emitting chips mounted to the upper surface of the printed circuit board adjacent to the light receiving chip and resin sealing portions sealing the light receiving chip and the light emitting chips mounted to the upper surface of the printed circuit board wherein a first resin is selected to have opaque optical characteristics and a second resin is selected to have transparent characteristics.

Fiber optic grating sensor demodulation systems are described that offer high speed and multiplexing options for both single and multiple parameter fiber optic grating sensors. To attain very high speeds for single parameter fiber grating sensors ratio techniques are used that allow a series of sensors to be placed in a single fiber while retaining high speed capability. These methods can be extended to multiparameter fiber grating sensors. Optimization of speeds can be obtained by minimizing the number of spectral peaks that must be processed and it is shown that two or three spectral peak measurements may in specific multiparameter applications offer comparable or better performance than processing four spectral peaks. Combining the ratio methods with minimization of peak measurements allows very high speed measurement of such important environmental effects as transverse strain and pressure.

A measurement probe, such as a touch trigger probe, is described that comprises a stylus module attachable to a base module. The stylus module comprising a housing and a stylus holder moveably attached to the housing. The base module comprises a measurement portion for generating measurement data indicative of movement of the stylus holder relative to the housing. The stylus module has an inbuilt failure mode and thereby a substantially predetermined operational lifetime. In one embodiment, the inbuilt failure mode is provided by integrating a battery into the stylus module. Providing a mechanical failure mode in which a component of the stylus module catastrophically fails after a certain amount of usage is also described.

In a mobile device for moving a mobile body in mutually orthogonal two- or three-axis directions, a positional error of the mobile body with respect to a direction orthogonal to preset two-axis directions out of the above two- or three-axis directions is used to determine, by using a sequential two-point method, a straightness error curve representing a change status along one-axis direction out of the above two-axis directions; the straightness error curve determining is repeated for the other one-axis direction out of the above two-axis directions.

It has a right camera, a left camera, a camera stay which holds the right camera and the left camera at predetermined positions, and an attachment portion having openings for fixing the camera stay to a vehicle, in which the openings are positioned at a plurality of virtual lines parallel to a base line connecting the right camera and the left camera, a plurality of the openings are arranged on a virtual parallel line far from the camera stay, and one opening is arranged on a virtual parallel line closer to the camera stay than the faraway virtual parallel line. This structure provides a stereo camera which can prevent from deformation of the camera stay owing to a difference of expansion between the attachment portion and the camera stay and from deviation in the base length and the optical axis of the both cameras, with high distance-measurement accuracy even in a change of surrounding temperature.

Focusing systems for which variation of magnification with focus is either inherently compensated, or is calibrated and corrected. The required conditions for inherent compensation are determined, and the desired state is called constant relative magnification. It is shown that telecentricity does not guarantee constant relative magnification. Both telecentric and non-telecentric accessory cameras for endoscopes are disclosed that have constant relative magnification, as are additional optical systems for general metrological purposes. Methods for calibrating change in relative magnification and deviation of the optical axis with focal shift are disclosed, as are methods for incorporating these changes into perspective dimensional measurements. Embodiments are disclosed in which only a single quantity need be measured to perform the correction, and these embodiments require only a low-resolution position transducer to provide accurate measurements. Apparatus is disclosed that enables an accessory camera to be aligned to an endoscope using only externally accessible adjustments. This apparatus also makes it possible to de-mount the camera from one endoscope and re-mount it to another without requiring any recalibration.

A thin, flat capacitive load sensor, such as of layered sandwich construction, having a variety of shapes, so as to provide a seal between two or more opposing surfaces. The load sensor includes a thin first and second insulating outer layer between which an inner layer is secured. The inner layer can be formed of dielectric material of a known dielectric constant, with at least one thin electrical conductor to accommodate load sensing disposed against a first face, and another thin electrical conductor to accommodate load sensing disposed against a second face. Electrical conductors connect the thin conductive areas on the first and second faces to the distal end of a tab ending beyond the load or connection measurement area. The distal end of the tab accommodates a connection with electrical measurement apparatus. As the inner layer is compressed, the spacing between the electrically conductive areas on the opposing faces is decreased such that compressive forces can be measured as a function of the changes in capacitance of the sensor. In this manner, proper compression can be achieved by monitoring capacitance during installation. Follow-up sampling or continuous measurement of sensor compression provides early detection prior to failure to allow corrective action.

The present invention provides a communication quality measuring device, a communication quality measurement method, and a communication quality measuring program by which the reliability and accuracy of the results of measurement carried out on a transmission path are improved, and comparisons between the results of measurement at one time and the results of measurement at another time or between one flow and another flow are made easier.The communication quality measuring device includes: a quality measuring unit (734) that measures the communication quality of a transmission path, based on data being transmitted through the transmission path; an observation time calculating unit (738) that calculates a time interval for securing an observation time for the quality measuring unit (734); and a measurement triggering unit (736) that causes the quality measuring unit (734) to start measurement at the time interval calculated by the observation time calculating unit (738). The observation time is the time required for maintaining predetermined measurement accuracy in the communication quality measured by the quality measuring unit (734). The data are the data to be transmitted for test to the transmission path, for example.

An electronic sphygmomanometer includes a pressure control unit configured to conduct pressurization control on a cuff (pressure control toward a specific direction) and acquire a cuff pressure signal at a time of the pressurization control to thereby measure a pressure pulse wave; a displacement decision unit configured to decide whether displacement has occurred between a position of the cuff and a virtual position of the heart based on an output from an angle sensor when the pressurization control is being conducted; and a return processing unit configured to, when it is decided that displacement has occurred, stop the pressurization control and conduct depressurization control on the cuff to thereby return an intra-cuff pressure to a specific pressure value that denotes a pressure value before the occurrence of the displacement. The pressure control unit resumes the pressurization control after processing by the return processing unit.

A tone wheel constituting a rotation detection magnetic encoder in combination with a magnetic sensor fixed onto a stationary side member, the tone wheel comprising a metal reinforcing ring fitted in a rotary side member and a circular multipolar magnet fixed to the metal reinforcing ring. the circular multipolar magnet is made of a plastic magnet of a circular resin molded product which contains a magnetic powder therein and is magnetized with a number of S and N poles alternatively along its circumference; the circular multipolar magnet is fixed to a surface of the metal reinforcing ring opposed to the magnetic sensor with an adhesive; and a restraint portion is provided at a part of the portion wherein the circular multipolar magnet is fixed to the metal reinforcing ring, thereby fixation of the circular multipolar magnet to the metal reinforcing ring is reinforced and depart of the circular multipolar magnet from the metal reinforcing ring is prevented.

The invention provides a current sensor, which is indicated that a core (1) is divided by alternately arranging plural magnetic material portions (3) and plural non-magnetic material portions (4) in a circumferential direction of the core through which a primary conductor penetrates (5), a conductor is wound around the core under conditions in which each core cross section of the core (1) intersects the magnetic material portion and the non-magnetic material portion, each core cross section including a cut end surface of each conductor (2a) of a secondary winding wound (2) around the core (1), and a ratio of a magnetic material portion cross-sectional area of the magnetic material portion to a non-magnetic material portion cross-sectional area of the non-magnetic material portion at the core cross section is kept constant at each core cross section. Then, the core (1) has a plurality of cutting cores, in which the ratio of a magnetic material portion cross-sectional area to a non-magnetic material portion cross-sectional area is defferent.

To provide a resistance measuring device not requiring a long time for the resistance measurement work of a tire and maintaining the accuracy of measurement to assure the electrical conductivity characteristics of the tire and a method thereof.An electrical resistance measuring device for tires 10 comprises first and second probes 2, 3 for measuring an electrical resistance value of a tire 5, wherein the first probes 2 abut on a plurality of portions in an outer peripheral surface of a tread part 6 and the second probe 3 abuts on a periphery of a center part of a tire 5, and thereby an electrical resistance value between the tread part 6 and the bead part 9 is measured.

A core is divided by alternately arranging plural magnetic material portions and plural non-magnetic material portions in a circumferential direction of the core through which a primary conductor penetrates. A conductor is wound around the core under conditions in which each core cross section of the core intersects the magnetic material portion and the non-magnetic material portion, each core cross section including a cut end surface of each conductor of a secondary winding wound around the core, and a ratio of a magnetic material portion cross-sectional area of the magnetic material portion to a non-magnetic material portion cross-sectional area of the non-magnetic material portion at the core cross section is kept constant at each core cross section.

A three-dimensional shape measurement apparatus includes main pattern illumination parts, main image-capturing parts and a control part. The main pattern illumination parts obliquely illuminate grating pattern light in different directions toward a measurement target. The main image-capturing parts obtain a grating pattern image of the measurement target by receiving reflection light of the grating pattern light illuminated from the main pattern illumination parts and obliquely reflected by the measurement target. The control part produces height data of the measurement target using grating pattern images of the measurement target, or produces height data of the measurement target using image positions of plane images for the measurement target and texture information of the measurement target. The control part employs a grating pattern illuminated on the measurement target as the texture information to produce height data of the measurement target. Thus, a three-dimensional shape may be measured more easily and accurately.

An air data sensor device using a flow around a cylinder is provided. The air data sensor device may include a sensor measurement unit which includes a sensor body provided in a cylindrical form including a hollow inside, a plurality of pressure measurement holes disposed on an outside of the sensor body, and a thermostat attached to one side of the sensor body, and a signal processing unit which includes a pressure sensor connected to the plurality of pressure measurement holes, and a microprocessor connected to the pressure sensor to perform calculation. A main pressure measurement hole having a high pressure value may be selected from the plurality of pressure measurement holes, pressure distribution may be calculated, and at least one of an angle of attack, a static pressure, and a total pressure may be calculated using the pressure distribution.

A thermal type flow sensor measures a flow rate of a fluid by means of a heat resistive element having a temperature dependency. The sensor is comprised of: plural heat resistive elements used for a flow rate measurement; and a driver circuit for controlling a current applied to these heat resistive elements to cause their heating. The driver circuit is configured to sense a resistance change of a lower-temperature side heat resistive element among the plural heat resistive elements and to control the current to be applied to the plural heat resistive elements in accordance with a sensed value of the lower-resistance's variation.

The conventional temperature control device for an optical measuring instrument only cools down a light source module, and cannot maintain a stable temperature of other modules and optical path space in the optical measuring instrument, so that a measuring result is not accurate. The invention provides an optical measuring instrument temperature control method and device, and an optical measuring instrument. The device comprises a first temperature control element (15) which is thermally coupled with an incident module (11) of the optical measuring instrument, and a second temperature control element (10) which is thermally coupled with an emitting module (9) of the optical measuring instrument. The first temperature control element and the second temperature control element control the temperature of the modules to prevent the modules from being influenced by light source heat. Preferably, the device also comprises an air supply device (4,2,1,7,33,3) which is used for providing airflow on an air path to keep the temperature within a certain range. The air path covers the optical path space between a wafer and a measuring mechanism of the optical measuring instrument, so that the stable temperature in the optical path space is maintained.

A distance measuring device and a method for determining a distance are provided. The distance measuring device includes a reflective member, evaluation electronics and a sensor device having at least one coupling probe for feeding a transmission signal into a line structure with the reflective member. The reflective member includes a base plate with an attached collar for forming a cup-shaped element.

The invention belongs to the field of welding arc pressure measuring, and discloses an arc pressure distribution measuring device and method based on graph phase centered short-time arcing. A computer system is connected with a data collection controller; the data collection controller is connected with a pressure sensor and a controllable welding power source which is connected with a welding torch and an electrode, arcs sent out by the welding torch are aligned with a guide hole of a water cooling pole plate, and the electrode is connected with the water cooling pole plate; the pressure sensor is connected to the lower end of the guide hole; the water cooling pole plate is fixed to a high-precision manual transverse moving table; two cameras connected to the computer system are aligned with the guide hole in two vertical directions at the level to carry out shooting; during measuring, the controllable welding power source is controlled to discharge for 0.5 second to 2 seconds, and when the arcs are stabilized, the cameras carry out shooting; the air pressure in the guide hole is changed and is transmitted through the pressure sensor, and data are recorded; the position of the guide hole is subject to fine adjustment through the high-precision manual transverse moving table, and the arc pressure of the continuous measuring point in one direction is measured, the data are collected and arranged, and the arc pressure distribution is obtained.

A collection of couplers and a corresponding coupling method that removably connect existing forensic scales to create a coupled scale, wherein a ruler arm of each scale is slidingly engaged in a track of the coupler that provides and maintains arm-to-arm angular accuracy for scales coupled in a fixed angle, co-planar joint, and measurement accuracy of scale markings across the joint. The track includes a lower surface; two laterally opposed parallel edge walls extending up from the lower surface and spaced apart by a dimension suitable for slidingly engaging a ruler arm width; holding tabs that extend laterally inward from both edge walls spaced above the lower surface by a dimension suitable for slidingly engaging a ruler arm thickness; an open end; and preferably a longitudinally distal registration stop. Two coupler tracks are joined with co-planar lower surfaces; and an edge wall of each joined at a fixed angle vertex.

A transparent liquid suction measuring device comprises a conduit portion, a main body, and a suction generating portion. Liquid can be sucked into the main body via the conduit portion. The main body comprises a chamber to accommodate the liquid. The chamber has many inward projecting elements, a corresponding area, and many outward projecting elements. The inward projecting elements occupy an inward projecting volume that is compensated by an outward projecting volume formed by the outward projecting elements. So, an accommodating volume of the chamber is constantly maintained. When the inward projecting elements are visually observing from a corresponding area through the chamber, magnifying effect is generated. These outward projecting elements can be observed to acquire the liquid volume. Therefore, the advantages includes magnifying scales through liquid lens effects, having a compensation design to maintain measuring accuracy, and having a rough structure to make scales much visually obvious.

A light amount is increased and an analyzing accuracy can be kept in accordance with an enlargement of a load angle, however, a scattered light tends to be loaded in an analysis accompanying the scattered light and a dynamic range of a concentration which can be measured becomes narrow. A light is dispersed by a light dispersing portion, a load angle of the received light is changed per wavelength, the load angle is made larger in the light of a wavelength having a small light amount, and the load angle is made smaller in the light a wavelength having a large light amount and used for an analysis accompanying a scattered light. Accordingly, it is possible to gain a dynamic range of a concentration which can be measured in the analysis accompanying the scattered light, while increasing the light amount and maintaining the analyzing accuracy.

A photo detector package is provided. The photo detector package includes a carrier, a photo sensor and a calibration module. The photo sensor having an active surface is disposed on the carrier. The calibration module is disposed on the carrier. The calibration module is electrically connected to the photo sensor. Moreover, the photo detector package described above can precisely detect the intensity of a light source (radiation) to be measured.

Disclosed herein is a reference electrode having a self-calibration function, which is used in electrochemical measurement and whose measurement accuracy can be maintained for a long period of time. Also disclosed is an apparatus for automatically correcting electrochemical potential using the reference electrode. The apparatus comprises: a reference electrode, comprising an external electrode body having an electrolyte membrane at one end thereof and an electrolyte solution filled therein, and at least two electrically isolated internal electrodes which are disposed in the external electrode body in such a manner that they are immersed in the electrolyte solution; and a reference potential calibrator for applying AC voltage to the internal electrodes to measure the electrical conductivity of the electrolyte solution of the electrolyte solution and output a correction signal about the change in the reference potential of the reference electrode. The reference electrode and the apparatus can suitably calibrate the change in the potential of the reference electrode by measuring the internal electrolyte of the reference electrode and calculating the concentration of the internal electrolyte, and thus the function of the reference electrode can be maintained for a long period of time.

Fill level measuring device having a control unit, which contains a high-frequency generator for generating a transmission signal, an amplifier, an amplifier and an evaluation unit, and a spatially remote probe, which contains a measuring impedance, a reference impedance, a first rectifier and a second rectifier, as well as a connecting line between the control unit and the probe, wherein the rectifier detects the voltage of the transmission signal in the probe, and this voltage is transmitted to the control unit as a first DC voltage signal, and the rectifier converts the probe current in the probe into a second DC voltage signal via measuring resistors, and both signals are supplied to the control unit for the purpose of determining the fill level, wherein the rectifiers are thermally coupled to one another.

A collection of couplers and a corresponding coupling method that removably connect existing forensic scales to create a coupled scale, wherein a ruler arm of each scale is slidingly engaged in a track of the coupler that provides and maintains arm-to-arm angular accuracy for scales coupled in a fixed angle, co-planar joint, and measurement accuracy of scale markings across the joint. The track includes a lower surface; two laterally opposed parallel edge walls extending up from the lower surface and spaced apart by a dimension suitable for slidingly engaging a ruler arm width; holding tabs that extend laterally inward from both edge walls spaced above the lower surface by a dimension suitable for slidingly engaging a ruler arm thickness; an open end; and preferably a longitudinally distal registration stop. Two coupler tracks are joined with co-planar lower surfaces; and an edge wall of each joined at a fixed angle vertex.

A detection system in which a single sensor is employed to detect an extensive range of a parameter. The output signal from the sensor is fed to the input of the electrical circuit, having a feedback loop, wherein the electrical circuit has a non-linear transfer characteristic. The non-linear transfer characteristic is achieved by changing the behavior of the feedback loop of the electrical circuit at a predetermined level of input signal. The output of the circuit has a proportional relationship with the input until the input signal reaches this predetermined value, whereupon the behaviors of the feedback loop changes and the relationship of the output to the input of the circuit changes. While the input signal is above the predetermined value, the output of the circuit has a linear but disproportionate relationship with the input at a gradient different to that when the input signal is below the predetermined value. Further, the behavior of the feedback loop changes to create a knee point in the response between the proportional and the linear parts of the characteristic. In this way, an overall non-linear transfer characteristic is produced by the electrical circuit, the transfer characteristic having with a well-defined knee point. The resolution of input signals below the knee point may be greater than the resolution of signals above the knee point.

A detection system in which a single sensor is employed to detect an extensive range of a parameter The output signal from the sensor is fed to the input of the electrical circuit, having a feedback loop, wherein the electrical circuit has a non-linear transfer characteristic. The non-linear transfer characteristic is achieved by changing the behaviour of the feedback loop of the electrical circuit at a predetermined level of input signal. The output of the circuit has a proportional relationship with the input until the input signal reaches this predetermined value, whereupon the behaviour of the feedback loop changes and the relationship of the output to the input of the circuit changes. While the input signal is above the predetermined value, the output of the circuit has a linear but disproportionate relationship with the input at a gradient different to that when the input signal is below the predetermined value. Further, the behaviour of the feedback loop changes to create a knee point in the response between the proportional and the linear parts of the characteristic. In this way, an overall non-linear transfer characteristic is produced by the electrical circuit, the transfer characteristic having with a well-defined knee point. The resolution of input signals below the knee point may be greater than the resolution of signals above the knee point.

A distance-measuring imaging device includes: a drive controller that outputs a light emission signal and an exposure signal; a light source; a solid-state imager that performs exposure to reflected light; and a TOF calculator that calculates a distance to an object using an imaging signal. The drive controller: cyclically outputs a first exposure signal group in which, before an exposure period of one exposure signal ends, an exposure period of at least one other exposure signal starts; and outputs a second exposure signal group having a dead zone period during which all exposure signals are in a non-exposure period. The TOF calculator calculates a first distance value using a first imaging signal obtained according to the first exposure signal group, calculates a second distance value using a second imaging signal obtained according to the second exposure signal group, and calculates the distance based on the first and second distance values.