182results about How to "Reliable measurement results" patented technology

The present invention relates to a portable device (10) for determining a heart rate of a person (20), comprising a heart rate measurement unit, a motion measurement unit for measuring the motion of a body part (12), and a processing unit. The processing unit is adapted to measure a signal quality of the heart rate signal and accordingly switch between two calculation modes: If the signal quality is above a predefined threshold, the heart rate is calculated based on the heart rate signal. If the signal quality is so poor that a reliable calculation of the heart rate is technically not possible anymore based on the heart rate signal, the processing unit switches to its second calculation mode, in which the heart rate is estimated based on the motion signal by estimating a heart rate constant, which depends on the frequency of the motion signal, and defining an exponential development of the heart rate, starting at the last reliably measured heart rate and finishing at the estimated heart rate constant.

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 discloses an unconventional natural gas content automatic measuring apparatus. The apparatus comprises a gas collection measuring cylinder (3), a balancing measuring cylinder (4), a liquid storage tank (5), a data acquisition and control system (6), a host computer (7) and a lifting device (12) for driving the motion of the gas collection measuring cylinder (3) and the balancing measuring cylinder (4) relative to the liquid storage tank (5), each of the lower ports of the gas collection measuring cylinder (3) and the balancing measuring cylinder (4) is placed below the liquid level of the liquid storage tank (5), a precipitation tank (1) is placed in a constant temperature water-bath box (2), a gas guide tube A (18) is communicated with the precipitation tank (1) and the gas collection measuring cylinder (3), and a gas guide tube B (19) is communicated with the balancing measuring cylinder (4) and outside air. According to the invention, a photoelectric non-contact closed loop measurement and control method is adopted to realize the constant-pressure equal-volume automatic continuous measurement of the content of the natural gas in an unconventional natural gas reservoir sample, and the apparatus has the advantages of simple structure, reliable measurement and analysis results, simple operation, and high measurement precision.

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 an unidirectional precise distance measuring triangulated height measuring method. The unidirectional precise distance measuring triangulated height measuring method is mainly used for determining atmospheric vertical refraction coefficient in trigonometric leveling, and determining weighing value in network adjustment of ranging trigonometric leveling. The unidirectional precise distance measuring triangulated height measuring method mainly comprises following steps: laying of a reference point and points to be measured, and height determination of the reference point and the points to be measured; acquisition of sample data used for refraction coefficient correlativity determination; calculation of refraction coefficients of observed orientations; determination of refraction coefficient correlativity of observed orientations, and variance estimation; calculation of unidirectional distance measuring triangulated height; and weighing value determination and survey adjustment in unidirectional network adjustment of ranging trigonometric leveling. The unidirectional precise distance measuring triangulated height measuring method is suitable for height measurement in repeat and high risk environment, is capable of obtaining height of projects lack of bi-directional observation conditions, or projects used for increasing trigonometric leveling precision via determining refraction coefficient difference, or projects adopting unidirectional trigonometric leveling instead of bi-directional trigonometric leveling so as to reduce cost.

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.

An object to be solved by the present invention is to determine the dissociation constant of an analyte molecule immobilized on a metal surface and a molecule that interacts therewith in surface plasmon resonance (SPR) analysis via an analytical method that produces a low noise level (i.e., a noise width of a reference chip), small baseline fluctuations (i.e., signal changes of a reference chip), and highly reliable results of measurement. The present invention provides a method for determining a dissociation constant of an analyte molecule immobilized on a metal surface and a molecule that interacts therewith, wherein changes in surface plasmon resonance signals are measured by using a surface plasmon resonance measurement device comprising a flow channel system having a cell formed on a metal film and a light-detecting means for detecting the state of surface plasmon resonance by measuring the intensity of a light beam totally reflected on the metal film; wherein a change in surface plasmon resonance signals is measured in a state where the flow of the liquid has been stopped, after the liquid contained in the above flow channel system has been exchanged; and wherein the dissociation constant is determined based on the results of measurement of signal changes.

The present invention relates to a gear dynamic transmission error measurement method and a gear dynamic transmission error measurement device, and belongs to the gear transmission precision measurement technology field. Aiming at the development tendency that a conventional gear measurement device is required to use the gear dynamic precision taking a gear dynamics research result as the basis to substitute for the gear static precision taking the gear geometry and kinematics research results as the basis, the present invention provides the gear dynamic transmission error measurement method and the gear dynamic transmission error measurement device. By a gear rapid assembling device, the gears of different sizes and specifications are replaced rapidly and at a high precision; by a precise movement platform, the adjustment of a center distance and the tooth width direction parameters is controlled accurately; and by utilizing a working condition simulation system to simulate the state of a gear actual working system, the measurement precision and the credibility of a dynamic transmission error are improved. By considering the gear working load and the lubrication conditions, adopting an unconnected high-precision circular grating to obtain the information of the angular positions of the driving and driven gears, and utilizing a digital phase comparison method to process the data, the gear dynamic transmission error is obtained.

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.

The invention discloses an MEMS gyroscope test device, system and method. The device comprises a high-low-temperature box (4), wherein a rotating table top (3), a driving motor, a temperature control system, a sliding ring and a single / multi-chip test plate (1) are arranged inside the high-low-temperature box (4); a rotating table control system is arranged outside the high-low-temperature box (4); a data collecting plate (2) is also arranged inside the high-low-temperature box (4); the data collecting plate (2) is arranged on the rotating table top (3); the data collecting plate (2) receives analog output signals from the single / multi-chip test plate (1), performs analog-to-digital conversion, and then outputs the converted digital signals to the outside of the high-low-temperature box (4) through the slide ring. The data collecting plate is arranged inside the high-low-temperature box (4); the output signals of the tested single / multi-chip are converted into digital signals; then, the converted digital signals are transmitted to the host machine through the slide ring; the real and reliable measuring results with small errors, high precision can be obtained.

The invention concerns a method and a system for monitoring the operation of the safety circuit of an elevator, said safety circuit containing safety switches connected in series with a contactor and a static circuit. In the method, the current flowing in the safety circuit is measured and the state of the safety circuit is determined on the basis of the measured current. The measurement of the safety circuit current is preferably performed without a galvanic connection to the safety circuit. The state of the safety circuit is determined on the basis of the magnitude of the measured current, from which the positions of the safety switches during the current measurement can be inferred.

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.

Paste dispenser and method for controlling the same, the paste dispenser for dispensing a desired paste pattern on a substrate including a stage for detachably placing the substrate thereon, a nozzle having a paste discharge opening opposite to a main surface of the substrate placed on the stage, for discharging the paste on the substrate while making relative movement to the stage, and section measuring means for measuring a section of a paste pattern on the substrate in a stationary state without relative movement to the substrate.

The invention discloses a device and a method for measuring the atmospheric coherence length of a mobile beacon. The device consists of a beacon light source, a light source carrier, a receiving telescope, a rotating cloud deck, a subsequent imaging system, an analog or digital CCD camera and a computer, wherein the beacon light source is fixed on the light source carrier to move during measurement; light emitted from the light source passes through the turbulent atmosphere to form two faculae vertically arrayed on a target face of the analog or digital CCD camera through the receiving telescope and the subsequent imaging system; converted digital images are sent to the computer for processing; and according to the data processing results, the computer controls the analog or digital CCD camera to change parameters, automatically adjust image qualities and perform the identification and extraction of targets so as to measure the atmospheric coherence length. The device and the method have the advantages of greatly expanding the working range of an atmospheric coherence length meter, effectively reducing errors caused by different levels of operators, achieving more real and reliable measurement results and greatly improving the properties of the atmospheric coherence length meter.

In order to determine leakage on a device, which contains gas that can be condensed, an adsorbent is used through which ambient gas of the object is conducted. The adsorbed gas is desorbed by means of actuating an excitation device and fed to a gas sensor containing a mass spectrometer. In this way, minute amounts of leaking gas can be determined by means of accumulation. The method is in particular suited for use in the serial production of refrigeration machines.

The invention provides a monitoring method and a monitoring device for displacement of an oil and gas pipeline in a frozen soil area, and relates to the technical field of measuring of linear dimension and a piping system. A total station is utilized for monitoring displacement of the pipeline in the frozen soil area. A reference peg and a sighting peg are mounted in a monitoring area, and pipeline clamping devices are mounted on a pipeline to be monitored. A local coordinate system is established based on the reference peg and the sighting peg, and coordinates of the pipeline clamping devices are regularly measured. If displacement of the pipeline occurs, coordinates of the pipeline clamping devices are changed, and coordinate transformation in the time interval of two measurements is the displacement of the pipeline in the time interval. The monitoring device for displacement of the oil and gas pipeline in the frozen soil area is low in cost, stable and reliable, convenient to operate, and capable of effectively monitoring displacement of a pipeline in a frozen area.

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.

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).

A device for the gravimetric volume determination of liquid volumes. The device comprises a housing (11) having the shape and dimensions of a standard rack used in a clinical diagnostic analyzer system for holding sample or reagent containers, and the following components contained in housing (11): a load cell (12) for gravimetric volume determination, a weighing container (13) for receiving a liquid to be weighed with said load cell (12), a windbreak (14) which shields said weighing container (13) from air flow, an evaporation trap (15) which prevents evaporation of liquid loaded into said weighing container (13), a temperature sensor (21), an air-pressure sensor (31) and a humidity sensor (41) for sensing temperature, air pressure and humidity respectively at predetermined points within said housing (11), and an electronic processing unit for processing electrical output signals delivered by said load cell (12) and by said sensors (21, 31, 41).