59results about How to "Eliminate the effects of measurement results" patented technology

A measuring method for dynamic object modulation transfer function belongs to the test field of optical properties. The invention aims to provide a measuring method for dynamic object modulation transfer function that can not only remove background vagabond ray and dark current of an image sensor, but also remove nonideal target size and the effect on a measuring result by the diffraction and aberration defect of an optical system. The method first respectively records an interference image, a still image and a dynamic image through imaging under the condition of closing and lightening a point light source, keeping the light source still and moving the light source, respectively uses the still image, the dynamic image and the interference image to do subtraction and obtain an anti-interference still image and an anti-interference dynamic image, extracts and modifies line spread function therein to obtain modified static and dynamic object line spread functions and obtains initial static and dynamic object modulation transfer functions through Fourier transformation. And finally, the method uses the initial dynamic object modulation transfer function to be divided by the initial static object modulation transfer function, thus obtaining the final measuring result of the dynamic object modulation transfer function.

A detection system and method of lithography machine projection lens odd chromatic aberration based on two-stage illumination are disclosed, wherein the invention uses the two-stage illumination mode to replace the conventional illumination model so as to optimize the periodic parameter of the phase-shifting grating as the detection in two-stage illumination mode; the detection mark is used for detecting the wave aberration of the lithography machine projection lens; the detection precision is obviously improved.

The invention belongs to the precision mechanical error field and displays a device and a method for measuring a main shaft rotation error by using circular gratings and autocollimators. The measuringdevice is formed by a set of double reading head circular gratings installed on a main shaft, a plane mirror attached to a shaft bottom end and a set of self-made autocollimators. When the main shafthas a radial rotation error, a radial motion error measured by the circular gratings and a deflection error measured by the autocollimators are combined to calculate the radial rotation error at anypoint on the shaft, and then, the motion state of the shaft during a rotation process is analyzed. By using the structure of the invention, the influences of a main shaft circularity, surface roughness and the changes of a load on the main shaft on a measurement result can be eliminated. And simultaneously, the device can be used to realize the high precision positioning of a main shaft rotation angle.

The invention provides a method for measuring thin ice by adopting a finger-inserting micro-structural capacitive thin ice sensor, relating to the technical field of sensors. The method provided by the invention aims to solve the problems of large size, difficulty in mounting, low detection sensitivity and poor accuracy of an existing icing sensor. The method comprises the following steps: receiving data through a controller; judging whether the data of reference capacitance is equal to the data of icing measuring capacitance; if yes, judging that an airplane surface is not iced; if not, judging whether the icing measuring capacitance is 2-78 times of the reference capacitance; if yes, judging that the airplane surface is iced; if not, comparing the icing data with the temperature data and humidity data; judging whether the icing data meets the condition of humidity data with above 70% humidity or temperature below 0 DEG C; if yes, judging that the airplane surface is iced; and if not, judging that the airplane surface is not iced. The thin ice sensor is mounted on the airplane surface and is used for measuring the icing.

The invention discloses a method for measuring austenite content in steel by using an X-ray diffraction technology. The method comprises the following steps: firstly, scanning a steel test sample by using an X-ray diffractometer to obtain an XDR (External Data Representation) graph; revising martensite and austenite by using the XDR graph and calculating the diffraction strength of each crystal face; and finally, measuring the content of the austenite in the steel test sample. With the adoption of the designed method for measuring the content of the austenite in the steel by using the X-ray diffraction technology, the measurement accuracy of the content of the austenite in the steel is improved under the condition that the test sample has a texture.

The invention discloses a device and method for measuring the thickness of a lubricating oil film on a high-speed rolling interface. The measuring device comprises a dynamic roll center distance measuring device, a sheet thickness measuring device, a data processing module and a display device. The dynamic roll center distance measuring device can accurately measure the distance between the roll center of an upper working roll and the roll center of a lower working roll, and the sheet thickness measuring device can measure the variations in horizontal thickness and vertical thickness of a sheet. After being obtained, the distance between the roll center of the upper working roll and the roll center of the lower working roll and the thickness of the sheet are processed by the data processing module, and then the variations in thickness of the lubricating oil film on the rolling interface are obtained. The measuring device can measure the thickness of the lubricating oil film on the high-speed rolling interface, is simple in structure and convenient to maintain, and eliminates the influences of vertical vibration of a rolling mill on the measurement result, furthermore, the elastic flattening of the working roll and the thickness difference of cross sections of the sheet are also taken into consideration, so that the result is more accurate.

The invention provides a torque sensor which is composed of a supporting base, stress plates, a sleeve, a thin-wall plate and resistance strain gages. The supporting base, the stress plates and the sleeve are an integrated forming structure, the sleeve is coaxially and fixedly connected with the supporting base through the tangential stress plates on two sides, the stress plates on the two sides are symmetrical with the central axis of the sleeve as the center, the outer surfaces of the stress plates on the two sides serve as tangential planes of the edges of the sleeve, and the thickness of the stress plates is between 2mm to 5mm. The resistance strain gages are attached to the inner sides and the outer sides of the stress plates, the resistance strain gages on the stress plate on one side are distributed symmetrically with the center of the stress plate as the center, and the thin-wall plate along the normal direction of the sleeve is connected between the sleeve and the supporting base. The torque sensor can be used for measuring torque of a transmission shaft directly and does not need to dismantle a measuring device, the resistance strain gages symmetrically arranged on two sides of the stress plates can eliminate influence of temperature on measuring results, and torque of an object to be measured under the static condition can be measured.

The invention discloses an ultrasonic ranging sensor capable of resisting sound wave interference and a ranging method thereof. The overall sensor is formed through encapsulation of an ultrasonic transducer, a signal processing circuit and a microprocessor. The microprocessor generates transmitted waveform feature parameter vectors X, and outputs transmitted signals; the signal processing circuitamplifies the transmitted signals to generate excitation signals; the ultrasonic transducer generates ultrasonic pulse signals, then the ultrasonic pulse signals are received, and echo signals are generated; the signal processing circuit amplifies and filters the echo signals; the microprocessor generates echo waveform feature parameter vectors Y; the microprocessor judges the relevancy of the transmitted waveform feature parameter vectors X and the echo waveform feature parameter vectors Y, the relevancy is larger than or equal to a set threshold value, and then the echo signals are received;the microprocessor calculates the distance between the sensor and a target object. By means of the ultrasonic ranging sensor, sound wave interference can be effectively inhibited, sound wave attack from a vicious attacker can be resisted, and accurate and reliable measurement of the distance of the target object is achieved.

A flexible differential array electrochemical glucose sensor and a use method thereof are disclosed, the sensor comprises seven sensor units which are identical in structure and arranged side by side, each sensor unit comprises a flexible substrate and a first three-electrode monomer and a second three-electrode monomer which are arranged on the flexible substrate, and the first three-electrode monomer and the second three-electrode monomer are identical in structure, and both comprise a reference electrode, an auxiliary electrode and a working electrode. The use method is as follows: one sensor unit is used in one day, seven days of continuous measurement can be achieved, and in the manner of transposition measurement, the skin sensibility phenomenon caused by long time extraction of tissue fluid can be reduced. The flexible differential array electrochemical glucose sensor has small size and high precision advantages, can achieve in-situ measurement, also can achieve the integration of glucose concentrations of transdermal extraction tissue fluid and measurement extraction tissue fluid, solves the problems of adhesion of skin and the sensor in the extraction process and the skin sensibility and the like caused by long time extraction, and eliminates the influence of environmental factors on sensor measurement results.

The invention discloses a detection method of a linear grating ruler, relates to a detection technology of a precision measuring instrument, and mainly relates to the detection method of the linear grating ruler. The method comprises the following steps of selecting N measuring points at equal intervals within a detecting stroke of a ball sliding block; when the ball sliding block moves to a selected measuring point, synchronously acquiring displacement measurement values salphai', sbetai' and sgammai' measured by three beams of laser of a three-optical axis laser interferometer, and optical grating distance data si on the detected linear grating ruler; performing compensation on the salphai', sbetai' and sgammai' to obtain si'; and performing linear fitting on the compensated data si' of each measuring point to obtain a function, modifying the compensated data si' of each measuring point to obtain yi, and taking the ratio of max|yi-si| to total range A as a detection standard of the detected linear grating ruler, thus realizing detection on the linear grating ruler. The method is used for detecting the linear grating ruler.

The invention provides a spatially correlated cylindrical shape error monitoring method and system and a medium, and the method comprises a surface measurement step of measuring the surface of a cylinder, and obtaining the three-dimensional coordinate data of a measurement point; a data processing step of obtaining an error value of the measurement point according to the obtained three-dimensional coordinate data of the measurement point; and a spatial correlation judgment step of judging whether the error value of the measurement point has the spatial correlation or not according to the obtained error value of the measurement point, and obtaining a spatial correlation judgment result. The monitoring method and system of the cylindrical geometric error with spatial correlation provided by the invention can reflect the form of the processing error more accurately, remove the influence of the spatial correlation on the measurement result and effectively improve the recognition rate of unqualified products, and improves the defect that the traditional cylinder quality monitoring cannot reflect the geometric shape of the cylinder and the defect of the spatial correlation caused by a large number of measuring points.

The invention discloses an integrated detection device applied to a small aero engine crankshaft. A stationary center and a live center of the detection device are arranged at two ends of a base, and the stationary center and the live center are positioned with two ends of the crankshaft for clamping the crankshaft; two V-type blocks are fixed at the upper part of the base and located between the stationary center and the live center, and the supporting positions are at two main journals of the crankshaft respectively; a fixed support and an elastic support are arranged between the V-type blocks, the fixed support is supported at the right crank of the crankshaft, the elastic support is supported at the left crank of the crankshaft, and the elastic support is automatically adjusted for measurement in a height direction; a detection support realizes front-back and up-down movement along the track of a fixed bracket under driving of the motor; each detection head is corresponding to a detection point of the crankshaft; and due to one-time clamping of the detection device, measurement on the nominal diameter size of each cylindrical surface of the crankshaft, main journal and crankshaft cylindricity, crank and datum plane parallelism degree and the distance between the crankshaft center and the crankshaft reference center can be completed, and the detection efficiency is improved.

The invention discloses a chlorophyll content detection and control method with a temperature and humidity compensation function. The method comprises the following steps: presetting a normal threshold parameter of chlorophyll content of leaves; enabling infrared light and red light with certain wavelengths to penetrate through a to-be-detected leaf in sequence; adopting a photoelectric sensor to detect the infrared light input intensity and the infrared light output intensity of the infrared light penetrating through the to-be-detected leaf in sequence; adopting the photoelectric sensor to detect the red light input intensity and the red light output intensity of the red light penetrating through the to-be-detected leaf in sequence; calculating the chlorophyll content of the to-be-detected leaf, displaying the chlorophyll content in real time through a display module, comparing the calculated chlorophyll content with the preset normal threshold parameter of the chlorophyll content of the leaves, and if the chlorophyll content is not within a normal threshold range, giving an alarm and starting a regulation device for regulating the chlorophyll content to be within the normal threshold range.

The invention relates to the technical field of geochemical exploration and especially relates to a method and a system for fast measuring distribution of a nitrogen element on the soil surface. The system comprises an enclosed negative pressure cabin, an analysis device, a two-dimensional moving sample bench, a laser excitation device and an atomic spectrum collection device. The analysis device controls a movement state of the two-dimensional moving sample bench. The laser excitation device and the atomic spectrum collection device are used respectively for exciting and collecting a trace atomic emission spectrum of the soil surface and analyzing the content of a nitrogen element in an irradiation position on the soil surface. The analysis device adopts control, calibration and quantitative regression algorithms, and is used for calculating content of a nitrogen element in different irradiation positions on the soil surface and automatically drawing a nitrogen element distribution map. Through the method and the system for fast measuring distribution of a nitrogen element on the soil surface, distribution maps of organic nitrogen, available nitrogen and a nitrogen element on the soil surface are obtained and the influence produced by a nitrogen element in air on a measure result is eliminated.

The invention discloses a (D)KDP crystal body damage performance high-precision measurement device and measurement method, relating to the technical field of (D)KDP crystal body damage measurement. According to the method, crystal body damage point base data after action of high power nanosecond laser pulse is acquired through chromatography, problems like damage point repeated statistics, background light elimination and binarization are solved, center of mass of each scattering point is resolved by using an image moment algorithm, then body damage point three-dimensional distribution is acquired through a reconstruction algorithm, then three body damage representation parameters, including crystal body damage density ppd, body damage point geometric size distribution pps and crystal bodydamage point three-dimensional distribution can be acquired highly precisely. The method has the advantages of high measurement accuracy and more complete crystal body damage representation.

The invention discloses an integrated waveguide optical biochemical sensor based on luminous power specific value demodulation and belongs to the technical field of optical sensing. The integrated waveguide optical biochemical sensor comprises a light path part, a sensing branch and a circuit part, wherein light waves output by a laser device enter a first optical waveguide directional coupler through a first straight optical waveguide to be divided into two paths; the two paths respectively enter a sensing branch optical waveguide and a reference branch optical waveguide; the concentrations of biochemical samples to be detected are different and the optical wave phase changing amounts are different; the light waves which are transmitted by the sensing branch optical waveguide and the reference branch optical waveguide enter a second optical waveguide directional coupler of a branch to be coupled and divided; an obtained optical signal is converted into optical current through a photoelectric detector and enters a data acquiring and processing unit to be converted into luminous power; specific values of the two paths of the luminous power are demodulated so that the concentration of the biochemical sample to be detected is obtained. Based on a photoelectric integration technology, all parts are integrated into one chip so that the size of an optical biochemical sensing detection device is reduced; the integrated waveguide optical biochemical sensor has the advantages of high stability and simplicity and convenience in operation.

The invention relates to a lever arm effect correction method which comprising the following steps sequentially: 1) using M overload sensors, wherein each sensor comprises three sensitive heads which are axial-overload sensitive, normal-overload sensitive and side-overload sensitive, and M>=3; 2) using a used unit to measure angular velocity data; 3) using the overload sensors to measure axial-overload, normal-overload and side-overload; 4) obtaining a coefficient matrix A and a right end vector quantity b; 5) obtaining a transformational matrix Q; 6) obtaining a middle matrix and the changed coefficient matrix A2, wherein A2=AQ, B2=A2 TA2; 7) obtaining a solution vector X; 8) obtaining an axial-overload value X (1), a normal-overload value X (2), and a side-overload value X (3) of a barycenter after elimination of lever arm effect, wherein the X (1), the X (2), and the X (3) are a first element, a second element, and a third element in the X. The lever arm effect correction method uses measured data of a plurality of current devices to eliminate influence of the lever arm effects on the overload sensors, and enables measurement results of the overload sensors to be accurate.

The invention discloses a method which is applied to an atomic absorption spectrometer and is used for evaluating the performance of dual-channel linearity and balance of an electric detection system. The invention is characterized in that the performance of the dual-channel linearity and balance of the electric detection system for the atomic absorption spectrometer is evaluated by using a mercury lamp-potassium dichromate non-standard gradient measurement method and a mathematical model thereof. By using the characteristics of the stray light of the mercury lamp and the gradient measurement method, the standard substance is not required, therefore, the operation is simple and rapid, the mathematical reasoning is strict, the result is correct, and meanwhile, the sample channel linearity, the reference channel linearity and the dual-channel balancing performance index can be enhanced. The invention leads the quantitative and rapid evaluation on the electric detection system for the atomic absorption spectrometer to be possible, meanwhile, provides the rapid, correct and economical method and the mathematical model for the self-checking and the measurement of the detection system for the spectrometer and also provides a direction for enhancing the detection performance of the spectrometer.

The invention discloses a device and a method for nondestructive measurement of hydrogen content in solid steel. The device comprises a high-temperature proton conductor, a supporting pipe and a sealing cover, wherein the outer wall of the high-temperature proton conductor is coated with a porous electrode and an auxiliary heating electrode, the inner wall is coated with a reference electrode, thereference electrode and the porous electrode are connected with a first voltmeter, the porous electrode and the solid steel to be measured are connected with a second voltmeter, and the solid steel to be measured is in compression contact with the high-temperature proton conductor. The method comprises the following steps of (1), introducing reference gas into the device for nondestructive measurement of the hydrogen content in the solid steel; (2), heating the high-temperature proton conductor to a target temperature; (3), measuring the voltage between the inner wall and the outer wall of the high-temperature proton conductor through the first voltmeter, and measuring the voltage between the outer wall of the high-temperature proton conductor and the solid steel to be measured through the second voltmeter; and (4), calculating the hydrogen content at the contact part of the high-temperature proton conductor and the solid steel to be measured. According to the device and the method, nondestructive hydrogen measurement of service steel parts can be realized, the test is accurate, the test speed is high, the steps are simple, the hydrogen content of the steel parts can be measured through point-by-point scanning, and the hydrogen gathering area can be found in time.

The invention discloses a photoelectric sensor-based chlorophyll content detection method which comprises the following steps: enabling infrared light and red light with certain wavelengths to penetrate through a to-be-detected leaf in sequence; adopting a photoelectric sensor to detect the infrared light input intensity and the infrared light output intensity of the infrared light penetrating through the to-be-detected leaf in sequence; adopting the photoelectric sensor to detect the red light input intensity and the red light output intensity of the red light penetrating through the to-be-detected leaf in sequence; calculating the chlorophyll content of the to-be-detected leaf according to obtained light intensity parameters.

The invention provides a gas pressure monitoring system based on an optical fiber white-light interference measuring technology. The system comprises a white-light interference demodulator, an opticalfiber topology network and a gas pressure sensor set, the white-light interference demodulator comprises a white-light light source, a first optical fiber circulator, a second optical fiber circulator, a first optical fiber semi-reflecting mirror, a reflector, a first self-focusing lens, a stepping motor, a data acquisition card, a photoelectric detector and a computer, the optical fiber topologynetwork is formed by connection of optical switches or multiple channels of shunts in a tree-shaped structure, the gas pressure sensor set comprises a plurality of same gas pressure sensors, and eachgas pressure sensor comprises an elastic film, a reflective coating, a sensor housing, standard gas pressure inert gas, transparent glass, a second optical fiber semi-reflecting mirror and a second self-focusing lens. According to the gas pressure monitoring system based on the optical fiber white-light interference measuring technology, the gas pressure in a pressure container is monitored by employing the optical sensors so that the system is more applicable to pressure monitoring of gas pressure containers in severe conditions.

The invention discloses a six-wire system separated Wheatstone bridge temperature measurement structure and method. The structure comprises three copper thermal resistors R1, R2 and R3 and a platinumresistor Rt and is characterized in that a Wheatstone bridge is composed of a copper thermal resistor R1, a copper thermal resistor R2, a copper thermal resistor R3 and a platinum resistor Rt, whereinthe copper thermal resistor R1 and the platinum thermal resistor Rt form a side bridge arm, the copper thermal resistor R2 and the copper thermal resistor R3 form the other side bridge arm, six wiresare divided into three groups, A1 and A2 are power supply wires of the structure and are connected with two sides of the Wheatstone bridge, B1 and B2 are wires for measuring an actual power supply voltage of the structure and are further connected with the two sides of the Wheatstone bridge, C1 and C2 are wires for measuring voltage difference of a Wheatstone bridge arm, the C1 is connected witha circuit node Y, and the C2 is connected with a circuit node X. The temperature measurement structure is advantaged in that the temperature measurement structure is suitable for long-distance, high-resolution and high-accuracy temperature measurement application, and supports high-magnification measurement of a post-amplifier, and is capable of eliminating influence of wire resistance and temperature difference thermoelectric potential caused by long distance on the measurement result.

The invention discloses an earthwork backfill elevation measuring device suitable for a large-size foundation pit or trench, which comprises a base, a plurality of fixing cones arranged on the lower surface of the base, and a laser indicator, an upright column is fixedly mounted on the upper surface of the base, a sleeve is sleeved on the upright column, a top plate is fixedly mounted on the sleeve, and the laser indicator is fixedly mounted on the top plate. A photosensitive sensor is fixedly installed on the upper end face of the stand column, a distance measuring sensor is fixedly installed on the upper surface of the base, a stepping motor is fixedly installed on the upper surface of the base, a first bevel gear is fixedly installed on a rotating shaft of the stepping motor, and a second bevel gear is fixedly installed on a transmission shaft. The first bevel gear is meshed with the second bevel gear, the upper end of the transmission shaft is fixedly connected with a lead screw, a nut seat is installed on the lead screw, and the side surface of the nut seat is fixedly connected with the side surface of a sleeve through a connecting rod. The method has the beneficial effects that the method is suitable for a measurement environment with a larger foundation pit or groove, and the measurement process is simple and practical.

The invention is applicable to the technical field of medical monitoring, and provides a method and device for monitoring pulse blood volume parameters. The method comprises the following steps: obtaining at least two-way pulse wave signals at designated parts of a human body, wherein the at least two-way pulse wave signals correspond to at least two-way optical signals with different wavelengths; determining the pulse blood volume parameters according to the at least two-way pulse wave signals and a preset coefficient group. According to the invention, at least two-way pulse wave signals are analyzed and calculated, so that continuous monitoring on the pulse blood volume parameters is realized; at least two-way transmission light signals are obtained through enabling at least two-way light rays with different wavelengths to pass through the artery blood vessels of the designated parts of a human body, so that the at least two-way pulse wave signals are obtained; therefore, the impact of substances except hemoglobin on the measuring result is eliminated, and accurate measurement for the pulse blood volume parameters is realized.

The invention discloses a telemetering calibration-free fire early-stage characteristic gas detection device and an online demodulation method thereof, belongs to the technical field of fire detection, and solves the problems that an existing air-breathing type fire early-stage gas detection device is small in space detection range and traditional telemetering fire early-stage gas detection needs regular calibration. Laser scattering echo signals are adopted for detection in a telemetering mode, the space measurement range of the detection device is enlarged, in addition, compared with a corner reflector mode and a scattering echo signal mode for telemetering, the device is simple and has better maneuverability and flexibility. The gas concentration is demodulated on line in real time by directly inserting a reference gas chamber filled with gas to be detected with standard concentration into the device, the problem that an instrument needs to be calibrated regularly is solved, and according to the method, the gas concentration is demodulated by adopting a normalized signal of first harmonic to second harmonic. According to the method, the influence of the laser intensity, the response of a photoelectric detector and the change of a target reflection coefficient on a measurement result is eliminated.

The present invention relates to the field of liquid hydrocarbon mass metering, especially to a frame-type intrinsic safety type constrained adaptive sensor liquid hydrocarbon metering system withoutfoundation trench. The system comprises a storage tank and an electronic scale device arranged at the lower portion of the storage tank, according to conservation of mass and through weighing of a metering panel, after a liquid load and unload process, the weight of liquid load and unload is a variation value of the metering panel is [Delta]M to obtain input or output liquid hydrocarbon masses used twice, the weighing of the mass is provided to effectively reject the influences of the temperature and the pressure on a measurement result to obtain accurate weighing data, and a scale is embeddedinto a planar spacing blocking frame of four sides so as to effectively improve the structure stability of the device.

The invention discloses a novel horizontal well fluid imager comprising a support arm sensor component, a support arm straightening component and a support arm sensor driving component. The support arm straightening component is used for rotating the support arm sensor component to the position over an instrument so as to ensure that the sensor component is capable of measuring parameters of fluid in a shaft layer by layer; the support arm sensor driving component is used for lifting the support arm sensor component to the needed height to allow the same to scan water holdup and flow of fluid at different height levels on the fluid section continuously. The novel horizontal well fluid imager has the advantages that probes in the same group can perform fixed-point or continuous measurement on different levels of different well depths, and influences on measurement results from probe differences and human factors can be eliminated. A support arm can telescope and elongate freely under stress, so that safety in well logging of the whole instrument can be ensured.