43results about How to "Small measuring range" patented technology

The invention discloses a usable bandwidth measuring method which comprises the following steps: usable bandwidth measuring precision and usable bandwidth measuring range are received; when the usable bandwidth measuring range is greater than the usable bandwidth measuring precision, a numerical value within the usable bandwidth measuring range is used as detecting speed for sending a detection data packet, sending information is recorded; the detection data packet is received and receiving information is recorded; the sending information and receiving information of the detection data packet are obtained; according to the sending information and receiving information, whether the detecting speed is greater than the usable bandwidth is judged; if the detecting speed is greater than the usable bandwidth, the upper limit of the usable bandwidth measuring range is updated; if the detecting speed is less than or equal to the usable bandwidth, the lower limit of the usable bandwidth measuring range is updated till the usable bandwidth measuring range is less than or equal to the usable bandwidth measuring precision, then the numerical number within the usable bandwidth measuring range is used as the usable bandwidth. At the same time, the invention discloses a usable bandwidth measuring system and a device. The method, the system and the device can greatly improve the measuring speed of the usable bandwidth.

It is an object to provide a method by which the height of an electronic component sucked and held by a nozzle can be detected with high accuracy and high efficiency.This method is a component height measurement method applied to a mounter (100) equipped with a transfer head (8) having a component-sucking-and-holding nozzle (21), for transferring a component P and mounting the component P onto a board (3), and includes: lowering the component P to within the high-accuracy range of a first line sensor (13) for measuring the height of the component P; and measuring the height of the component P using the first line sensor (13).

The invention belongs to the technical field of a photoelectric stabilization tracking platform, and particularly relates to a sight line stabilization control method for a high-speed rotating platform. The method comprises the following steps: step one: coordinate systems, including a pedestal coordinate system, an external frame coordinate system and an internal frame coordinate system, are established; step two: a framework kinetics relation is established on the basis of the coordinate systems established in the step one; and step three: bi-stable loop cascade control is performed on the high-speed rotating platform on the basis of the kinetics relation established in the step two. The sight line stabilization method of the high-speed rotating platform is divided into two types of control loops of rotating stabilization and direct sight line stabilization. Each loop adopts independent controller design so that influence of high-speed rotation on sight line stabilization is separated, stabilization accuracy in sight axis is enhanced, a defect of poor stabilization accuracy of an existing photoelectric stabilization platform in the high-speed rotating state is overcome, and problems of high stability and high accuracy of the photoelectric platform, especially a staring type infrared seeker system, are solved.

The present invention discloses the application of electric eddy current sensor in measuring liquid pressure, and the application can meet the requirement in measuring pressure and liquid level of high viscosity and low flowability slurry fluid in high temperature, high pressure, high frequency response and other conditions, and has high overload resistance, high measurement precision, wide measurement range and high stability. The present invention has elastic diaphragm set in the lower part of outer side wall of liquid container and communicated with the measured liquid; horizontal metal link rod with one end fixed to the elastic diaphragm and the other end near the electric eddy current sensor with one horizontal interval in between; and processing circuit module connected to the output of the electric eddy current sensor. The present invention may be applied widely in various liquid pressure and level measuring fields.

The invention discloses a cavity length demodulation algorithm of a short cavity optical fiber fabry-perot sensor, and belongs to the technical field f optical fiber sensing. The cavity length demodulation algorithm of the short cavity optical fiber fabry-perot sensor is characterized by comprising the following steps: irradiating the short cavity optical fiber fabry-perot sensor by broadband light emitted by a white light source, acquiring reflection spectrum of the short cavity optical fiber fabry-perot sensor, moving the original reflection spectrum signal by a certain distance, which is less than the cycle length of the reflection spectrum signal, in the x-coordinate direction of a power spectrum density map to obtain an additional reflection spectrum signal, evaluating phase difference of the original spectrum signal and the additional spectrum signal by utilizing an ellipse fitting method, and obtaining an actual absolute cavity length value according to a fabry-perot cavity length calculation formula. By the cavity length demodulation algorithm of the short cavity optical fiber fabry-perot sensor, the problem about cavity length demodulation when the short cavity optical fiber fabry-perot sensor demodulation system acquires incomplete spectrum is solved, and the requirement on the light source spectrum range by the system is reduced.

An apparatus and method for blood treatment for the single-needle mode, the apparatus having an extra-corporeal blood circuit with a blood infeed line running to the inlet and a blood return line leading away from the outlet, of a blood treating unit, includes in the blood return line a device, e.g., container, for amassing blood, which is in flow-permitting connection for gas transfer with a device, e.g., container, for storing gas. A pressure is calculated and set in the device for storing gas before the arterial and venous phases are started, with two constraints. First, the pressure should be sufficiently low to ensure both no infusion of air into the patient and also regulated flow of blood into the patient even at opposing pressures lower than ambient pressure. Second, the pressure should be sufficiently high to expel blood from the device for amassing blood into the device for storing gas.

The invention discloses a human eye aberration measuring system based on phase diversity, which comprises an optical illuminating system, a pupil aligning system, an optical staring system and an optical imaging system. The optical illuminating system is mainly an optical system which illuminates the fundus oculi of a human eye by the aid of infrared during detection, the pupil aligning system is a system for aligning the human eye with an optical axis of the optical illuminating system and an optical axis of the optical imaging system before detection, the optical staring system is mainly an optical system for fixing the position of the eyeball of the human eye during detection, and the optical imaging system is mainly a system for realizing observation imaging for the area of the fundus oculi illuminated by the illuminating system. The human eye aberration measuring system overcomes shortcomings that in the prior art, objective aberration measurement time is long, individual aberration correction cannot be guided, measurement accuracy is low, a measurement range is small and the like.

The invention relates to a drilling electrical prospecting device and method for an overburden water-conducting zone, and belongs to the technical field of prospecting. The drilling electrical prospecting device comprises a plurality of polyvinyl chloride plastic pipes and steel bars serving as electrodes, wherein a fixing hole is drilled in the middle of each polyvinyl chloride plastic pipe; the intervals between adjacent fixing holes are 2 meters; the steel bars are inserted into the fixing holes for fixing; electric wires arranged in the steel bars are taken as electrode cables; the electric wires pass through the polyvinyl chloride plastic pipes. The drilling electrical prospecting device and method for the overburden water-conducting zone disclosed by the invention have the advantages of total-space prospecting of the overburden water-conducting zone, wider prospecting range, higher prospecting accuracy and higher working efficiency. Necessary basic geological data is provided for hazard control, and a novel geophysical prospecting measure is provided for the prevention and control of coal mine flooding.

The invention belongs to the optical fiber sensing technology field and especially relates to an optical fiber Fabry-Perot sensor cavity length multi-frequency correlation demodulation method. In theinvention, a problem that a difference between traditional cross-correlation function peak values is small so that judgment is fuzzy is solved. The method comprises the following steps of using broadband light emitted by a white light source to irradiate an optical fiber Fabry-Perot sensor, and collecting a reflection spectrum of the optical fiber Fabry-Perot sensor; carrying out cross-correlationoperation on a reflected spectral signal and a single frequency doubling template function to obtain a plurality of discrete peak values; then, carrying out cross-correlation operation on the reflected spectral signal and a multi-frequency doubling template function to extract an envelope of a multi-frequency doubling cross-correlation curve; and taking a wave trough position of an envelope curveas a reference, comparing with the plurality of discrete peak values obtained through single frequency doubling correlation, and taking a single frequency doubling signal peak value closest to the wave trough position of the envelope curve as a cavity length value of the corresponding optical fiber Fabry-Perot sensor. In the invention, demodulation precision of the optical fiber Fabry-Perot sensor is effectively improved.

A multiple degrees of freedom motion system comprising an arrangement of rigid stages, flexure constraint modules, actuators, and sensors. These components of the motion system are arranged and connected in a systematic fashion to provide a high degree of decoupling between the motion axes, suitable placement of ground-mounted actuators to actuate each motion axis, and suitable placement of sensors to allow end-point measurement along each motion axis. This arrangement of rigid stages, flexure constraint modules, actuators and sensors enables large motion range and high motion quality in the motion system, while using standard and commonly available components.

The invention discloses a temperature test chamber calibration and point distribution device. The temperature test chamber calibration and point distribution device comprises a telescopic rod device (1) and clamp devices (3), wherein a pressing device (2) is arranged at the bottom end of the telescopic rod device (1), the telescopic rod device (1) is in the shape of a telescopic rod, and the clamp devices (3) are separably connected to the telescopic rod device (1). According to the temperature test chamber calibration and point distribution device, the telescopic rod device (1), the pressing device (2) and the separable clamp devices (3) are adopted, the length can be adjusted by vertically sliding the telescopic rod, the whole telescopic rod part is pressed by the pressing device under the action of a spring mechanism, the position of a sensor is accurately positioned in the axial direction by telescopic rod clamps, the temperature sensor is fixed through sensor clamps, damage to the connecting line of the temperature sensor is avoided, the whole temperature test chamber calibration and point distribution device is simple, light, economical and practical, and the purposes that point distribution of the sensor is accurate, efficiency is high, the sensor is not prone to damage, and operation is easy to perform are achieved.

The invention discloses a gas flowmeter. The gas flowmeter includes a shell body, a gas inlet pipeline, a rectification sleeve, a top lid and a connector. The gas inlet pipeline is arranged in the shell body, an annular part between the shell body and the gas inlet pipeline is provided with multiple backflow gas passages axially extending along the gas inlet pipeline, the top lid is connected to the upper end of the shell body, the top lid and the end portions of the shell body and the gas inlet pipeline form an installation space, and the rectification sleeve is arranged in the installation space; the connector is connected to the lower end of the shell body; the rectification sleeve comprises a main flow channel and multiple sub flow channels communicated with the main flow channel, thesub flow channels are arranged and communicated with the backflow gas passages in a one-to-one corresponding mode, and the main flow channel is communicated with the outlet end of the gas inlet pipeline; one of the backflow gas passages is internally provided with a flow sensor. By adopting the gas flowmeter, a wide flow measurement range can be achieved with small-sized space, and the gas flowmeter has a high measurement range ratio.

The invention discloses a quick detecting device for arsenic element in natural gas. The quick detecting device comprises a gas carrying device, an absorption liquid carrying device and a power device, wherein the gas carrying device is used for carrying to-be-detected natural gas; the absorption liquid carrying device comprises one adsorption device or multiple adsorption devices, air inlets and air outlets are formed in the adsorption devices, and the multiple adsorption devices are connected in series and are internally filled with adsorbing agents; the power device is connected between the gas carrying device and one air inlet in the absorption liquid carrying device, and the power device is used for pumping the natural gas in the gas carrying device in the absorption liquid carrying device for being adsorbed by the adsorbing agents. The quick detecting device for the arsenic element in the natural gas, disclosed by the invention, is simple, the cost of used adsorbing agents is low, quick treatment and detection of a natural gas site can be met, the carry is convenient, the cost is lower, and the quick detecting device can be put into use on a large scale.

The invention discloses an outdoor integral intelligent combined transformer. The outdoor integral intelligent combined transformer is characterized in that a small current signal acquisition module acquires small current signals, a small voltage signal acquisition module acquires small voltage signals, a remote intelligent module receives the small current signals and the small voltage signals and outputs digital small current signals and digital small voltage signals, the current signal acquisition module acquires the small current signals by the aid of a Rogowski coil, the small voltage signal acquisition module acquires the small voltage signals by the aid of a capacitive voltage dividing ring and an inductive voltage divider, and epoxy resin is cast on the Rogowski coil, the capacitive voltage dividing ring, the inductive voltage divider and the remote intelligent module to form a transformer body. The outdoor integral intelligent combined transformer has the advantages that the outdoor integral intelligent combined transformer is compact in structure, high in precision, good in linearity and wide in measurement range, can be installed and used easily and conveniently and is light, shortcomings of narrow frequency band and slow response of the traditional electromagnetic transformer can be overcome, and the outdoor integral intelligent combined transformer has an important practical significance and high application value in modification and improvement on existing electrical equipment of transformer substations and construction of all-digital intelligent transformer substations.

A method and device for non-contact measurement of relative displacement (path difference) between a first component (2) and a second component (4), which are moving in an absolute sense to a structure that is fixed in position. The device includes a field barrier element (8, 10) arranged on each of the two components. These elements have structures that result in different magnetic permeation resistances at different relative overlaps. The field barrier elements project into a magnetic field that permeates them. A means (30) is associated with this magnetic field for determining the magnetic field strength that varies as a function of overlap of the field barrier elements and for evaluating the values determined.

A blood pressure measurement apparatus includes: a search unit that comes into contact with a living body and receives a signal from the living body; a blood vessel detection section that detects a blood vessel based on the signal; a teaching information generation section that generates teaching information when no blood vessel is detected by the blood vessel detection section at a first site in which the search unit comes into contact with the living body so as to move the search unit in a first direction intersecting the median line of the living body starting from the first site; and a blood pressure calculation section that calculates a blood pressure of the living body based on the signal when the blood vessel is detected by the blood vessel detection section at the first site in which the search unit comes into contact therewith.

The invention discloses a method for measuring minute current in a circuit consisting of an electrified body in a solution and the solution The method for measuring minute current in a circuit consisting of an electrified body in the solution and the solution comprises steps of connecting a variable resistor or a metal wire which can be used as a variable resistor to a measured circuit in series and connecting a voltmeter to the variable resistor or the metal wire which can be used as the variable resistor in parallel, obtaining voltage values on two ends of the variable resistor wire, obtaining a minute current value on the electrified body according to a calculation formula, wherein the calculation formula is as follow: I1=VR / R2, wherein I1 is a value of minute current on the electrifiedbody, VR is a voltage value of the variable resistor or on two ends of the metal wire which can be used as the variable resistor, and R2 is a resistance value of the variable resistor or the metal wire which can be used as a variable resistor. The method for measuring the minute current in the circuit consisting of the electrified body in the solution and the solution can measure the minute current formed by minute potential differences of the electrified body in the water.

The present invention discloses the application of electric eddy current sensor in measuring liquid pressure, and the application can meet the requirement in measuring pressure and liquid level of high viscosity and low flowability slurry fluid in high temperature, high pressure, high frequency response and other conditions, and has high overload resistance, high measurement precision, wide measurement range and high stability. The present invention has elastic diaphragm set in the lower part of outer side wall of liquid container and communicated with the measured liquid; horizontal metal link rod with one end fixed to the elastic diaphragm and the other end near the electric eddy current sensor with one horizontal interval in between; and processing circuit module connected to the output of the electric eddy current sensor. The present invention may be applied widely in various liquid pressure and level measuring fields.

The invention discloses a radar signal instantaneous frequency measurement method and device, and the method comprises the steps: dividing laser from a laser into two paths, and enabling the two paths of laser to serve as optical carriers; taking a radar signal to be measured as a modulation signal to carry out amplitude modulation on one path of optical carrier, and generating a pump optical signal; performing frequency modulation on the other path of optical carrier by using the sweep frequency signal as a modulation signal to generate a probe light input signal; inputting the pump light signal and the probe light input signal into an optical fiber section in opposite directions, and performing energy conversion between the pump light and the probe light by using an optical fiber stimulated Brillouin scattering effect; and performing photoelectric detection on the transmitted probe light output signal, and determining a corresponding frequency sweep signal frequency value when the intensity of the output electric signal is maximum. The problems of small frequency measurement range and low benefit in the prior art are solved.

The invention belongs to the field of hydraulic pressure, and relates to a two-stage corrugated pipe type pressure vessel capable of displaying volume. The pressure vessel comprises an outer cylinder (1), a convex seal head (2), a concave end cover (3), a primary corrugated pipe (4), a secondary corrugated pipe (5), a primary convex cover (6), a secondary convex cover (7), a connecting seat (8), a connecting flange (9), an indicating device (10), an oil inlet / outlet (11) and an inflation valve (12). The pressure vessel is suitable for the fields of pressure accumulators, pressurizing oil tanks and the like needing volume compensation and pressure stabilization, has the characteristics of small volume, high volume utilization rate, large expansion and contraction amount, strong volume compensation capability and good oil supply, and is low in manufacturing cost, high in material utilization rate, less in welding seam quantity and good in reliability. Meanwhile, a measuring range of an indicating device is shortened by adopting a primary corrugated pipe and a secondary corrugated pipe, and the overall size is shortened.

The method includes: a first profile generation step of generating a first profile of irregularities in a measurement range set on the substrate sheet (2), based on first measurement information acquired at a location upstream of the coating machine (30) and indicating a shape of irregularities of the substrate sheet (2); a second profile generation step of generating a second profile of irregularities in the measurement range, based on second measurement information acquired at a location downstream of the coating machine (30) and indicating the shape of the irregularities of the substrate sheet (2); and a coating amount calculation step of calculating the amount of the applied coating from a difference between the first measurement information and the second measurement information, based on a positional relationship in which the shape of the first profile of irregularities and the shape of the second profile of irregularities are matched to each other.

The invention discloses a pneumatic roll gap instrument. The pneumatic roll gap instrument comprises a ruler body and a ruler frame. The ruler body is connected with the ruler frame through a dovetail groove. The ruler frame can slide vertically on the ruler body. A single-acting cylinder is arranged in the ruler body. A side hole of the ruler body corresponds to an air hole of the single-acting cylinder. The head of a piston rod of the single-acting cylinder is connected with a connecting plate. An upper benchmark arc plate is fixed to the upper end of the connecting plate. A reading device is fixed to the lower end of the connecting plate. A lower benchmark arc plate is arranged at the lower end of the ruler body. The upper benchmark arc plate and the lower benchmark arc plate are respectively provided with three guide rails. The guide rails are evenly distributed on the upper benchmark arc plate and the lower benchmark arc plate. The pneumatic roll gap instrument is simple in structure, convenient to operate, high in accuracy, low in cost and suitable for popularization.

The invention relates to a laser parameter detection device, in particular to a laser power meter and a method for calibrating a sampling coefficient of a large optical system based on the laser power meter. The problems that when an existing laser power meter is applied to large optical system sampling coefficient calibration in an industrial field, the structure is not compact, installation and testing in the industrial field cannot be achieved, long-distance transmission cannot be achieved, and the calibration cost is high are solved. The laser power meter comprises a to-be-measured laser optical sampling module, a photoelectric conversion analog circuit module and a digital circuit module which are directly connected in sequence; the device is of an integrated design, is compact in structure, is easy to integrate, facilitates the installation, debugging and maintenance of an industrial field, and can be applied to the calibration of a large-scale optical system sampling coefficient. In the calibration process, the influence of background light is deducted, the interference of background stray light on sampling coefficient measurement is weakened, and the whole calculation method is simple, convenient to realize online and short in processing time. And meanwhile, due to synchronous sampling, the interference of light source fluctuation on sampling coefficient measurement can be reduced.

The invention belongs to the field of intelligent composite additive and subtractive material manufacturing, and discloses an online layer-by-layer detection additive and subtractive material composite manufacturing method, which includes: 1) establishing a three-dimensional model of the part to be formed and converting it into an STL model, and performing the STL model Carry out slicing, and obtain the theoretical morphology data of each layer, preset the additive processing path and subtractive processing path of each layer; 2) form multiple cladding paths according to the additive processing path of the current layer, and multiple The cladding road constitutes the current cladding layer, and the cladding road section morphology information is collected in real time while the cladding is forming, and the data is processed to obtain the current cladding layer morphology to assist in planning the path of adding and subtracting materials; 3) Repeat step 2) The cladding forming of each layer is completed to complete the manufacture of the entire part. The invention solves the problems of separation of manufacturing and measurement, lack of real-time feedback, and deviation in the manufacturing process in the past, improves manufacturing efficiency and manufacturing accuracy, and is suitable for layer-by-layer forming additive manufacturing.

A multiple degrees of freedom motion system comprising an arrangement of rigid stages, flexure constraint modules, actuators, and sensors. These components of the motion system are arranged and connected in a systematic fashion to provide a high degree of decoupling between the motion axes, suitable placement of ground-mounted actuators to actuate each motion axis, and suitable placement of sensors to allow end-point measurement along each motion axis. This arrangement of rigid stages, flexure constraint modules, actuators and sensors enables large motion range and high motion quality in the motion system, while using standard and commonly available components.

The invention discloses a dual-visual-angle light path device used for a wind tunnel with a smooth tunnel wall. The dual-visual-angle light path device comprises a side-view light path unit and a look-up light path unit, wherein the side-view light path unit is arranged at a side observation window of the testing segment of the wind tunnel with the smooth tunnel wall and used for producing a side-view light path so that the side-view light path can be over against a model placed in the wind tunnel with the smooth tunnel wall for imaging; the look-up light path unit is arranged in a lower plenum chamber of the testing segment of the wind tunnel with the smooth tunnel wall and used for producing a look-up light path so that the position under the model placed in the wind tunnel with the smooth tunnel wall can be imaged. According to the technical scheme, the limit by space and installation conditions is overcome, the technical problems that multiple existing high-speed cameras cannot be installed on a wind tunnel, and a camera shooting light patch cannot be arranged are solved, and a technical means is provided for multi-visual-angle camera shooting and measurement technology in a model placement test.

The invention belongs to the technical field of optical fiber sensing, and in particular relates to a cavity length-multiple-frequency correlation demodulation method of an optical fiber F-P sensor. The present invention aims to solve the problem of fuzzy judgment due to the small difference between the peak values ​​of the traditional cross-correlation function. The cross-correlation operation is performed on the spectral signal and the single-octave template function to obtain multiple discrete peaks, and then the cross-correlation operation is performed on the reflected spectral signal and the multi-octave template function to extract the envelope of the multi-octave cross-correlation curve, and the envelope The trough position of the curve is used as a reference, compared with multiple discrete peaks obtained by single-octave correlation, and the single-octave signal peak closest to the trough position of the envelope curve is taken as the cavity length value of the corresponding fiber optic sensor. The invention effectively improves the demodulation precision of the optical fiber FAP sensor.

The invention discloses a gas-liquid phase flow measurement device, comprising a medium circulation tube, a data collection unit and a data processor. A flow sensor and a capacitance sensor are serially connected in the medium circulation tube. A differential pressure transmitter is connected with the flow sensor by a pressure measuring hole, and synchronously connected with the data collection unit and the data processor by a signal output end; an impedance tester and a microwave emission tester are connected with the capacitance sensor in parallel; the impedance tester and the microwave emission tester are connected with the data collection unit and the data processor by signal output ends. The gas-liquid phase flow measurement device can measure the flow of the gas-liquid phase flow and the flow phase content synchronously without separating the gas-liquid phase flow, so that the flow of the gas-liquid phase flow and the flow phase content can be accurately measured in a simple and convenient manner.