281results about How to "Improve measurement repeatability" patented technology

The invention provides a protective heat flow meter method thermal conductivity coefficient measuring instrument for realizing the vacuum insulation and thickness measurement function. A test stack body of the measuring instrument comprises a hot plate and a cold plate, wherein a heating film is clamped between the hot plate and a hot plate fixed seat; and the cold plate is similar to the hot plate in structure. A vacuum system consists of a vacuum box, a vacuum pump, a sealing gasket and a sealing bottom plate; and the vacuum insulation function can be realized through the vacuum pump. A thickness measurement module consists of a displacement sensor capable of outputting an electric displacement signal; the displacement signal enters a controller and realizes the function of automatically measuring the thickness of a test piece; and the whole instrument is measured and controlled by a computer. The protective heat flow meter method thermal conductivity coefficient measuring instrument has the beneficial effects that the influence of environment on measurement stability is avoided through a vacuum chamber; meanwhile, the thickness of the test piece is automatically measured to avoid the personal error caused by manual measurement; and the measuring repeatability, the accuracy and the degree of automation of the instrument are improved. The protective heat flow meter method thermal conductivity coefficient measuring instrument can be widely applied to manufacturing enterprises of heat insulation and heat preservation materials, related quality inspection departments and units, institutes of higher learning, research institutes and other scientific research units.

The invention discloses a method for measuring the curvature radius of a lens by use of laser. The method uses a device and comprises the following steps: horizontally placing a planoconvex lens to be measured on the edge of a groove with round inside of a mounting seat; reflecting the laser by a reflector and vertically emitting the laser onto the planoconvex lens to be measured, wherein two light beams reflected by the upper and lower surfaces of the planoconvex lens to be measured are coherent lights and form an interference Newton's ring; measuring the dark ring level k of interference fringes through a reading microscope, and measuring the diameter corresponding to the kth level dark ring at the same time; assigning k+1, k+2, k+3,..., and multiple dark rings to k through a multi-measurement method, and measuring the diameter value of corresponding dark rings; processing data by a successive difference method, and measuring the diameter values of k+m+1, k+m+2, k+m+3,... and multiple dark rings at the same time; and calculating the measured data by a formula to obtain the curvature radius of the planoconvex lens to be measured. The invention also discloses a device for realizing the measurement method. According to the method and device disclosed by the invention, the planoconvex lens to be measured does not experience stress deformation, and the measurement precision is obviously improved.

A method for nondestructively detecting an elasticity of a viscoelastic medium and a device for nondestructively detecting an elasticity of a viscoelastic medium are provided. The method comprises steps of: a) driving an ultrasonic transducer probe with a low-frequency vibration by a vibrator so as to produce an elastic wave to be propagated in the viscoelastic medium, transmitting an ultrasonic wave to the viscoelastic medium by the ultrasonic transducer probe, and collecting an ultrasonic echo returned from the viscoelastic medium; b) selecting an effective ultrasonic echo from the ultrasonic echo according to a duration of the low-frequency vibration and physical parameters of the viscoelastic medium; c) calculating a propagation velocity of the elastic wave in the viscoelastic medium according to the effective ultrasonic echo; and d) calculating the elasticity of the viscoelastic medium according to the propagation velocity of the elastic wave.

A detection method of volatility organic compound ingredient in cigarette mainstream smoke comprises the following steps: (1) the entrapment of the volatility organic compound in the cigarette mainstream smoke: a XAD-4 absorption tube and a cold solvent are in tandem and entrap the volatility organic compound in the cigarette mainstream smoke; (2) the analysis of smoke sample: absorption material in the absorption tube is transferred into a chromatogram bottle; an extraction liquid and an internal standard are added in the chromatogram bottle and leach the absorption volatility organic compound; the absorption volatility organic compound is directly put into GC-MS to be detected; after the solution in the absorption bottle is added with the internal standard, the solution is directly put into GC-MS to be analyzed and detected; the summation of the amount of leached volatility organic compound and the amount of volatility organic compound in the solution is the total amount of the volatility organic compound in the cigarette mainstream smoke. Compared with the prior method, the method in the invention has more easy operation, only need the XAD-4 absorption tube and a tandem device of a cold solvent bottle and can effectively absorb all the main volatility organic compounds in the cigarette mainstream smoke; furthermore, the method in the invention has the advantages of sound repeatability and sound sensitivity; the method in the invention is also suitable for analysis of samples in large quantities.

An assay apparatus having a sample vessel within which an assay may be performed. The apparatus further includes a holder having a receptacle, socket or other device configured to operatively receive the sample vessel in a precise and easily repeated location with respect to the holder. A magnet may be operatively associated with the holder such that a magnetic field generated by the magnet intersects a portion of the sample vessel defining a magnetic concentration region within the sample vessel. A separate or integrated detection or interrogation instrument, typically a spectrometer, may be provided.

A method and apparatus capable of measuring visceral fat tissues accumulated in the trunk with high accuracy apply a current to a body part where a subcutaneous fat tissue layer is thin or a body part where a skeletal muscle tissue layer has no or a thin muscle belly portion from a pair of current applying electrodes, measure a potential difference which has occurred in the tissue through which the current has passed by a pair of voltage measuring electrodes, and determine the visceral fat tissue volume of the trunk by use of the impedance of the trunk which has been obtained by use of the measured potential difference.

The present invention provides a charged particle beam apparatus used to measure micro-dimensions (CD value) of a semiconductor apparatus or the like which captures images for measurement. For the present invention, a sample for calibration, on which a plurality of polyhedral structural objects with known angles on surfaces produced by the crystal anisotropic etching technology are arranged in a viewing field, is used. A beam landing angle at each position within a viewing field is calculated based on geometric deformation on an image of each polyhedral structural object. Beam control parameters for equalizing the beam landing angle at each position within the viewing field are pre-registered. The registered beam control parameters are applied according to the position of the pattern to be measured within the viewing field when performing dimensional measurement. Accordingly, the present invention provides methods for reducing the variation in the CD value caused by the variation in the electron beam landing angle with respect to the sample with an equal beam landing angle and methods for reducing the instrumental error caused by the difference in the electron beam landing angle between apparatuses.

The invention relates to a method for determining a carbonyl compound in mainstream smoke of a cigarette. The method comprises the following steps: (1) filling an adsorption material for capturing the carbonyl compound into an adsorption pipe of a smoking machine capturing device with an adsorption pipe, and capturing the carbonyl compound in the main stream smoke of the cigarette; (2) transferring the adsorption material with the carbonyl compound in step (1) into an analysis container, adding a desorption solution to desorb the adsorption material, adding a 2, 4-dinitrophenylhydrazine (DNPH) solution to derivatizate the adsorption material to obtain a desorption solution containing the carbonyl compound; and (3) detecting the desorption solution containing the carbonyl compound obtained in the step (2) by utilizing a liquid phase chromatography. The method has advantages of simplicity and rapidness in operation, high sensitivity and good repeatability.

The invention provides a television imaging system modulation transfer function test device and method and belongs to the technical field of optical measurement. The television imaging system modulation transfer function test device and method are characterized in that a television imaging system to be tested is placed in an optical collimation system illuminated by an integrating sphere light source, of which the light intensity is adjustable and which is high in space uniformity, and slit targets are arranged in the focal plane of the optical collimation system; the slit targets, after passing through the optical collimation system and the television imaging system to be tested, are imaged to a target surface of the television imaging system; and after an image recording and processing system carries out a series of calculation and processing on the slit images, line spread function distribution of the slit targets and the MTF value are obtained, and thus MTF measurement of the television imaging system is finished.

A method and apparatus for nondestructive evaluation (NDE) of structures and materials using a highly nonlinear medium for the generation and detection of one or multiple highly nonlinear pulses (or highly nonlinear waves) impinging on a material or structure. The apparatus includes pulse exciters that induce the propagation of highly nonlinear, weakly nonlinear or linear stress waves in the material, system, or structure to be inspected and/or detectors for the observation and the detection of the output waves from the material/structure being tested. The NDE method includes the use of the tunable highly nonlinear apparatus as impulse exciter alone, or in combination with an accelerometer or a nonlinear sensor to detect the outgoing pulse.

The invention belongs to the technical field of airplane icing detection, and specifically relates to a piezoelectric vibration cylinder icing sensor and a method for measuring icing condition thereof. Problems that most of the conventional icing sensors only provide icing threshold signals, the thickness of an ice layer cannot be effectively monitored in real time, the sensitivity is low, the size and the mass are large, and the requirements of miniaturization and intelligence of the sensors are hard to be met are solved. The piezoelectric vibration cylinder icing sensor comprises a vibration cylinder, the vibration cylinder is regarded as a resonance sensitive element, an inner wall of the vibration cylinder is pasted with two piezoelectric ceramics respectively serving as a piezoelectric actuating element and a piezoelectric pickup element, an insulation thermal conduction film is grown on an inner wall of the vibration cylinder, an electrothermal film is grown on the insulation thermal conduction film, and two ends of the electrothermal film are equipped with silver electrodes. The equivalent mass of the vibration cylinder is changed by icing so that the natural frequency is changed; and the measurement of the thickness of the ice layer is realized via the detection of the natural frequency of the vibration cylinder. According to the sensor and the method thereof, the precision is high, the reliability is good, the size is small, the power consumption is low, the structure is simple, the production is easy, and the measurement is free of the influence of the external magnetic field.

The invention discloses a coupled external mounted steel stay rope force detection device and a method. The device comprises an excitation assembly and a winding displacement coupling sensor, wherein the excitation assembly comprises a magnetic core, an excitation coil with a capacitive discharge circuit is sheathed on the magnetic core, a first magnetic pole and a second magnetic pole are arranged at two ends of the magnetic core and are respectively provided with a first press plate and a second press plate, the first magnetic pole and the first press plate are detachably connected, the second magnetic pole and the second press plate are detachably connected, a first clamp hole is arranged at a connecting part of the first magnetic pole and the first press plate, a second clamp hole is arranged at a connecting part of the second magnetic pole and the second press plate, and round lining pads are arranged on the inner walls of the first clamping hole and the second clamping hole. The method comprises the following steps that the device is used for detection, and in addition, magnetic feature curves of a steel stay rope to be detected are obtained; the device is used for detection, in addition, a group of standard magnetic feature curves are obtained; and the magnetic feature curves of the steel stay rope to be detected are compared with the group of standard magnetic feature curves to obtain the tension in the steel stay rope to be detected.

A confocal axial scanning device and a confocal axial scanning method based on a reflection type liquid crystal spatial light modulator relate to a confocal microscope and a scanning method of the confocal microscope, which solve the problems that in an existing axial scanning device and a method, the device is complex in structure and a sample is poor in repeatability of measurement due to the fact that defocus of a measured object is achieved by means of a lens or movement of the measured object along an axial direction. By means of the confocal axial scanning device, the reflection type liquid crystal spatial light modulator is added between a polarization beam splitter and the lens of the existing device, an axial scanning mechanism in a traditional confocal axial scanning device is eliminated simultaneously, and the reflection type liquid crystal spatial light modulator is utilized to replace the axial scanning mechanism. The confocal axial scanning method adopts a mode of utilizing a computer to directly modulate a phase gray-scale figure to adjust wavefront of a light wave in front of the lens so that zoom is achieved, and axial scanning to the measured object can be achieved without axially moving the measurement lens and the measured object. The confocal axial scanning device and the confocal axial scanning method based on the reflection type liquid crystal spatial light modulator are applied to the confocal microscope and the scanning method of the confocal microscope.

The invention provides a CCD device quantum efficiency measuring device and method. The device comprises a CCD device absolute quantum efficiency measuring apparatus and a CCD device relative quantum efficiency measuring apparatus, the CCD device absolute quantum efficiency measuring apparatus is used for measuring the absolute quantum efficiency of a CCD device on a 632.8 nm wavelength point, and the CCD device relative quantum efficiency measuring apparatus is used for measuring the relative quantum efficiency of the CCD device within the wavelength range from 300 nm to 1100 nm. According to the CCD device quantum efficiency measuring device and method, a 632.8 nm laser is used for emitting light into an integrating sphere to carry out absolute calibration after the light passes through a power stabilizing system, lasers with different levels of output power can be selected according to different CCD devices, the problem that optical power is low is avoided, no light loss is caused, a standard detector directly traces the source to a low-temperature radiometer on the 632.8 nm wavelength point, and therefore the number of intermediate links is reduced, and uncertainty of measurement is improved.

A sensor, sensor disk, sensor measurement correction system, and method used in measuring a parameter in the refining zone. The sensor includes a spacer that spaces its sensing element from the disk. In one preferred embodiment, the spacer is made of an insulating material that insulates the sensing element from the thermal mass of the disk to prevent the thermal mass from affecting sensor measurement. The sensor includes a housing carried by the spacer that, in turn, carries the sensing element. Where the sensing element is a temperature sensing element, the housing is thermally conductive and the housing and spacer enclose the sensing element. Each sensor is disposed in the refining surface, preferably in its own separate bore in the disk and flush with or below axial refiner bar height. Signals from one or more sensors are processed by a processing device linked to a module containing calibration data that is applied to make sensor measurements more accurate. The module holds calibration data from sensors that are precalibrated before the sensor disk in which they are assembled is shipped, along with the module, to a fiber processing plant where the disk is installed in a refiner and the module connected to the processing device. In one preferred embodiment the sensor or sensors are carried by a sensor module that can be a removable segment of a refiner disk.

The invention discloses a water area electric prospecting system comprising a main control platform, a multi-channel receiver, a transmitter, an underwater towed detection cable, and multiple electric field sensors. The main control platform is connected with the multi-channel receiver, and the transmitter is connected with the multi-channel receiver. The electric field sensors are installed on the underwater towed detection cable, and the underwater towed detection cable is connected with the multi-channel receiver and the transmitter. The water area electric prospecting system is used for completing electric prospecting of freshwater areas and measuring geo-electric parameters which can reflect the properties of rock, such as lithology, composition, porosity, fracture degree and water saturation. The technical problem that structural fracture zones, lenses, caves and other bad geological phenomena are hard to find through the existing dot prospecting is solved effectively. The water area electric prospecting system provided by the invention can assist in water prospecting to improve the reliability of water drilling.

The invention relates to a method and device for measuring the rotation inertia of a revolution body online, and belongs to the field of mechanical properties. The revolution body to be tested is connected with a measurement device; a first standard inertia disc is installed, a time synchronous control system performs control, a first time faller experiment starts to be executed and a data acquisition system records displacement data; a second standard inertia disc is replaced, the time synchronous control system performs control, a second time faller experiment starts to be executed, and the data acquisition system records the displacement data again; the angular accelerations at the same speed time are respectively calculated according to the displacement data obtained two times, and therefore the rotation inertia of the revolution body can be obtained. The affect on the measurement result of speed and load factors in the faller method is avoided, and the measurement repeatability and precision are improved.

A subcutaneous fat measuring unit measures the subcutaneous fat thickness by pressing a predetermined face against the living body surface. A pressing pressure measuring unit measures the pressure applied from the subcutaneous fat measuring unit to the living body surface, and a database holds information on the relationship among the values of a plurality of subcutaneous fat thicknesses in the condition where no pressure is applied to the living body surface, the pressure applied to the living body surface with respect to each of the plurality of subcutaneous fat thicknesses and the subcutaneous fat thickness in a condition where the pressure is applied. A calculating unit calculates the subcutaneous fat thickness in a condition where no pressure is applied to the living body surface, by use of the database based on the subcutaneous fat thickness measured by the subcutaneous fat measuring unit and the pressure applied to the living body surface which pressure is measured by the pressing pressure measuring unit. And a visceral fat calculating unit calculates the amount of visceral fat from the calculated subcutaneous fat thickness.

There are provided a surface shape measuring method and a surface shape measuring device which can measure the diameter of a workpiece to be measured with high precision and high reproducibility and have excellent versatility. These method include: acquiring first shape data indicating a surface shape of the workpiece with a detector being disposed on one side across a workpiece while rotating the workpiece relatively to the detector around a rotational center; acquiring second shape data indicating the surface shape of the workpiece with the detector being disposed on the other side across the workpiece while rotating the workpiece relatively to the detector around the rotational center; and calculating a shape parameter defining the surface shape of the workpiece by collating the first shape data and second shape data. In calculating the shape parameter, a deviation of the detector from the reference line is calculated based on the collation result.

The invention discloses a process for rapidly constructing an air shaft under a chill condition, mainly comprising the following steps: creating a pore, freezing the pore, constructing a temperature-measuring pore and a hydrologic observation pore and creating a drill hole together. The process is used for sinking all vertical shaft pit shafts by sealing water through three-synchronization of freezing, slip-casting and shaft sinking in the construction process, wherein the three-synchronization refers to the synchronous construction of the preparation and the installation of a permanent shaft frame, the freezing of a surface soil section and the digging and the building of the pit shaft while the ground preliminarily slip-casting construction is carried out, a freezing method is adopted in the surface soil section, and a group preliminarily slip-casting method is adopted in a bed rock section.

The invention discloses a standard device using a mass method for detecting high-pressure gas filling flow. The device comprises multiple high-pressure gas cylinder sets, an electronic balance and a lifting device. All the high-pressure gas cylinder sets are connected together through gas pipes, the lifting device is used for ascending or descending the high-pressure gas cylinder sets integrally, and gas cylinder valves, precision pressure gauges and flow indicating instruments are further arranged on the gas pipes. The lifting device comprises a loading trolley, multiple hydraulic oil cylinders arranged at the bottom of the loading trolley, needle valves which can adjust the hydraulic oil amount, a three-way directional control valve and an oil pump. The standard device judges whether a detected object meets standard requirements or not through comparing the mass difference of weighing the high-pressure gas cylinder sets via the electronic balance with the indicating value of the detected object, the flow range is wider, metering accuracy is higher, and measurement repeatability is better. The standard device can be respectively connected with a CNG dispenser, a CNG dispenser calibrating device and a high-pressure gas flow meter for measurement detection.

The invention discloses an integrated optical fiber high pressure sensor and a manufacturing method thereof. The integrated optical fiber high pressure sensor comprises a sensing unit, a glass capillary tube, a sensor body, welding points, a shell and a Fabry-Perot cavity, and is characterized in that the sensing unit is composed of a pressure sensing diaphragm, a glass substrate and a transmission optical fiber; the upper surface of the glass substrate is provided with a microcavity at the middle part through corrosion, the bottom of the microcavity acts as a first reflecting surface of the Fabry-Perot cavity, and the corrosion depth of the microcavity determines the initial length of the Fabry-Perot cavity; the glass substrate and the sensor body are connected together in an anode bonding mode; the glass capillary tube is attached to the bottom surface of the glass substrate; the sensor body and the shell are connected into an integral whole so as to provided protection for the sensing unit; and the transmission optical fiber is inserted from a bottom hole of the glass capillary tube and fixed, and the upper end face of the transmission optical fiber is attached to the bottom surface of the glass substrate. The sensor disclosed by the invention can avoid a defect of glued packaging of traditional optical fiber Fabry-Perot sensors, has a wider measuring range and can measure higher pressure.