181results about How to "Reliable measurement results" patented technology

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 plurality of measurement electronic device units (10, 20) each having a measurement detector connected thereto and thus having a measuring function are connected in series by connectors to be capable of mutually conveying measurement data and signals, and one (10) of the plural measurement electronic device units serves as a parent device having a function of transmitting/receiving measurement data and signals to/from an external device (5). Each of the control parts (21, 22) of the plural measurement electronic device units (10, 20) has a memory storing a measured value, and the parent device sends a measured value save command to a trigger line (44) in response to a request from the external device (5) to the parent device so that the measurement electronic device units including the own unit are caused to simultaneously save measured values in the control parts (21, 22).

The invention discloses a field calibration method of an on-wafer load traction measurement system. The field calibration method comprises the steps of firstly, manufacturing a mismatching attenuation chip with the reflection coefficient within the range of 0.1-0.8 to be used as a transmitting standard component, then, using a vector network analyzer which is calibrated in an on-wafer mode for carrying out calibration measurement on the transmitting standard component, obtaining a standard conversion gain GT(S) of the transmitting standard component and the calibration uncertainty of the transmitting standard component, then, using the transmitting standard component after the calibration for carrying out conversion gain parameter calibration on the on-wafer load traction measurement system, and completing the working of traceability of a quantity value of the on-wafer load traction measurement system. According to the calibration technology, the comprehensive and actual calibration can be carried out on the performance index of the on-wafer load traction measurement system, the calibration deviation delta GT is given, the measurement uncertainty of the on-wafer load traction measurement system can be quantitatively given, help is brought to the unification of the quantity value of the on-wafer load traction measurement system, and measurement technique supporting is provided for development and production of a power single chip circuit.

The invention relates to a determination method of the CO2 displacement minimum miscible pressure of a low and ultra-low permeability reservoir. The method includes the steps of 1, selecting a physical model core; 2, conducting anti-corrosion treatment on the physical model core; 3, applying confining pressure to the physical model core and conducting vacuumizing; 4, measuring the pore volume of the physical model core and calculating the porosity of the physical model core; 5, heating the physical model core to a target formation temperature and measuring the permeability to water; 6, simulating the oil saturation process, recording the volume of saturated simulated oil and calculating the initial oil saturation; 7, simulating CO2 displacement, recording the displacement pressure and the outlet end liquid and gas volumes and calculating the CO2 displacement recovery rate; 8, replacing the physical model core with another physical model core with the same permeability and repeating the steps 1-7 to obtain CO2 displacement recovery rates under different displacement pressures and return pressures; 9, drawing a relation curve of the CO2 displacement recovery rates and the return pressures, wherein the return pressure corresponding to the recovery rate inflection point on the relation curve is the CO2 displacement minimum miscible pressure of the low and ultra-low permeability reservoir.

A probe for use in photoplethysmographic (PPG) measurement includes a light source unit including a light source that contacts a predetermined site of an object and emits light onto the predetermined site, a photodetector unit positioned facing the light source unit to receive the light emitted from the light source unit and transmitted through the object, a body having a space for receiving the object and in which the light source unit and the photodetector unit are positioned in a same optical axis, and a pressure application unit coupled to the body for applying a pressure to the object via the light source unit. A biological signal measuring system includes the above probe, a controller for controlling operations of the probe and for recording and analyzing signals output from the probe, a detected light intensity display unit for displaying an intensity of detected light, and a biological signal display unit.

The invention relates to a device and a method for measuring the ice accumulation on an electrical wire. The device comprises a camera, a lighting device, a microprocessor and a storage unit, wherein the camera is arranged below an electrical wire to be measured between two electric poles and is used for collecting images of the electrical wire to be measured before and after icing, and the images are sent to the storage unit by a data line; the lighting device is arranged below the electrical wire to be measured between the two electric poles and is used for lightening the image collection area of the electrical wire to be measured above the camera; the microprocessor comprises an arithmetical unit for measuring the image data and calculating the thickness of the ice accumulation on the electrical wire and a controller for controlling the operation of the camera, the storage unit, the lighting device and a communication transmitting device, and the communication interface of the microprocessor is connected with the communication transmitting device; and the storage unit is used for storing the image data and the calculation formulas. The device can conveniently and fast detect the thickness of the ice accumulation on the electrical wire, provide caution to the operation unit, and have the characteristics of simple structure, low cost, accurate measurement, security and convenience. Besides, the steps of the method are simple, and the measurement result is true and reliable.

A non-destructive method capable of real-time or on-line measurement of a wood or pulp fiber without sample pretreatment for the microfibril angle and the path difference. A circular polariscope in combination with a line spectral camera generating a micrograph insensitive to the orientation of a fiber and determined only by the fiber's properties related to polarized light. A line image across the fiber is captured and dispersed it into a spectral image to perform a real-time spectral analysis of the fiber's image.

The invention provides a method for measuring grating diffraction efficiency based on a compensation algorithm and relates to the technical field of spectrum. The method solves the problems of measurement error and inaccurate measurement result in the conventional grating diffraction efficiency measurement method. The method comprises the following steps: performing wavelength calibration on a front monochromator; preparing a to-be-measured plane grating and a reference plane reflector; measuring the reflection luminous flux of the reference plane reflector; inputting basic parameters, such as groove density, to-be-measured wavelength range and blaze wavelength, of the to-be-measured plane grating, and measuring the diffraction luminous flux of test wavelength of the be-measured plane grating; and calculating emergent spectrum broadening width caused by grating chromatic dispersion and light beam section factor caused by grating rotation, calculating the measurement value with an error, and calculating the diffraction efficiency of the to-be-measured grating based on the compensation algorithm and according to a compensation model. The measurement method can set starting wavelength, terminating wavelength and scanning step length, and has the function of automatically correcting the measurement result. The measurement method is simple, and the measurement process is stable in performance and high in automation degree.

An embodiment of the invention disclose a dynamic crack tip stress field measuring method and a dynamic crack tip stress field measuring device, which relate to the technical field of stress field experimental research. The dynamic crack tip stress field measuring method comprises the steps of: using digital image acquisition equipment to acquire images before and after the surface of a test specimen deforms after being loaded; searching for a sub-region in which a second mass point locates in the image after deformation, wherein the sub-region in which the second mass point locates is matchedwith a sub-region in which a first mass point locates in the image before deformation; calculating displacement information of the first mass point before and after deformation; and calculating a stress field according to the displacement information of the first mass point. The dynamic crack tip stress field measuring method and the dynamic crack tip stress field measuring device are applicableto crack detection and mechanical laboratory.

Disclosed is an imaging system having an imaging device for producing images of objects and picture signals and an imaging controller connected to the imaging device through a transmission line. The imaging device includes a vertical synchronizing signal-producing circuit to produce an internal vertical synchronizing signal for the production of images of objects. The imaging controller includes a delay-measuring circuit and a vertical-synchronization phase-advancing circuit. In the system: the imaging controller transmits a test signal to the imaging device and receives the test signal returned from the imaging device and the delay-measuring circuit measures a delay of a phase of the returned test signal relative to a phase of the original test signal; the vertical-synchronization phase-advancing circuit advances a phase of an external vertical synchronizing signal by the delay and transmits the external vertical synchronizing signal to the imaging device; and the vertical synchronizing signal-producing circuit is reset by a signal transmitted from the vertical-synchronization phase-advancing circuit.

A solar simulator having improved measurement precision, including an array of light emitters having point light emitters planarly arranged in a given range, an effective irradiated region spaced apart from a surface having the array thereon, and a portion which absorbs at least a part of light from a direction which passes through a gap between the individual point light emitters. In a preferred aspect, the light absorption portion includes an absorption surface disposed in at least a part of the gaps between the light emitters. In another preferred aspect, a translucent board holds the light emitters and has a translucent portion corresponding to at least a part of the gaps between the light emitters, and an absorption layer at a position for absorbing light from the direction which passes through the translucent portion.

Disclosed are a method for measuring deformation of metal cylinders under an internal explosion effect and a device. The device consists of an exploder, a priming device, a plurality of electric probes, a multichannel detonation velocity meter and signal recording equipment. The exploder is arranged on an axis of a metal cylinder, the priming device detonates the exploder and outputs a priming time signal, the electric probes are arranged outside the metal cylinder, by the aid of the multichannel detonation velocity meter, pulse response is generated when measuring points of the electric probes contact with the wall of the metal cylinder, the signal recording equipment is used for recording output pulses of the multichannel detonation velocity meter and the priming time signal, gap values among the measuring points of the electric probes and the wall of the metal cylinder form a non-equivalence sequence, and when one of the electric probes contacts with the wall surface of the metal cylinder, a deformation value measured at the position of the corresponding measuring point of the electric probe corresponds to radial deformation of the metal cylinder. The method and the device have the advantages of simplicity, directness, reliable measurement results, easiness in operation and the like, measurement of deformation of different ranges is realized by means of changing mounting positions of the measuring points of the electric probes, and the method and the device are particularly applicable to measuring large-deformation parameters.

The invention provides a photothermal-fluorescent double-mode spectrum detection device. The photothermal-fluorescent double-mode spectrum detection device comprises a sample table for arranging a to-be-detected sample, and further comprises a pumping light source, a detecting light source, a first photoelectric detector, a second photoelectric detector and a photoelectric multiplier which are connected to the to-be-detected sample light path respectively, wherein the first photoelectric detector is used for receiving a detection photothermal signal transmitted from a detected sample; the second photoelectric detector is used for receiving a detection photothermal signal reflected from the detected sample; the photoelectric multiplier is used for receiving a fluorescent signal transmitted from the detected sample by virtue of an emission monochromator; the output ends of the first photoelectric detector and the second photoelectric detector are connected to the input end of a computer by virtue of a lock-in amplifier; and the output end of the photoelectric multiplier is connected to the input end of the computer. The invention further provides a detecting method of the photothermal-fluorescent double-mode spectrum detection device. The photothermal-fluorescent double-mode spectrum detection device is high in detection sensitivity and relatively reliable in detected result, and capable of eliminating the influences of scattering on the detected results.

When an amount of visceral fat is measured using ultrasonic waves during medical examination of metabolic syndrome, three contact positions are defined on the surface of the abdominal region, and three distances inside the living body are measured by bringing a probe into contact with the surface of the abdominal region at the contact positions. Specifically, three measurement paths having a starting point at the center of the descending aorta are set, and the distances from the center to a surface of the fat layer adjacent to the surface of the body (inner surface of the subcutaneous layer) in the measurement paths are observed. An approximate area of a visceral fat region can be determined from the three distances and two angles defined by the three measurement paths, and an index value is calculated on the basis of the area. A probe holder having three holding portions is desirably used.