153results about How to "Good measurement stability" patented technology

The X, Y and Rx positions of a mask stage are measured using two optical encoder-reading heads measuring displacements of respective grid gratings mounted on the mask stage. The grid gratings are preferably provided on cut-away portions of the mask table so as to be co-planar with the pattern on the mask itself. Measurements of the table position in the other degrees of freedom can be measured with capacitative or optical height sensors.

Provided is a gas flux measuring device measuring a region, such as forest, as a measuring object with no influence by concomitants and with high responsibility and excellent measuring stability. The device comprises a laser beam source, laser output controller, wavelength modulation controller, first light receiver, first direct current component detector, first wavelength modulation demodulator, optical system, reference cell, second light receiver, second direct current component detector, second wavelength modulation demodulator, third wavelength modulation demodulator, analyzer, adder, temperature measuring means and pressure measuring means. The device further comprises a flow velocity measuring means directly measuring horizontal 2-directional flow velocity components and a vertical directional flow velocity component of a gas flow in the measuring region and putting out these measurement signals into the analyzer. Based on the signals inputted from the flow velocity measuring means, the analyzer makes analysis based on the eddy correlation method and obtains, by calculation using this analysis result, a momentum flux and concentration of the measuring object gas.

The invention provides an integrated intelligent flowmeter and a measuring method. The integrated intelligent flowmeter comprises a measuring tube, an upstream pressure sensor component, a downstream pressure sensor component, a mounting bracket, a computer data processing unit, an upstream flowing regulator, a built-in core, a downstream flowing regulator and a temperature sensor. By using an inner Venturi tube as a throttle member, the accuracy and stability of measurement are improved; simultaneously, a plurality of pressure sensors are used for collecting pressure signals, an integrated data processing computer performs analog-digital conversion, software filtering, average value calculation and flow velocity and flow calculation on the pressure signals, the pressure signals after temperature compensation are converted into industrial standard digital signals or industrial standard current signals of 4 to 20mA to be output wirelessly or with wires; the invention can realize long-term stable and accurate on-line metering, especially has unique metering advantages at a situation that a long straight pipe section cannot be installed in site.

The invention discloses an egg quality lossless detecting method of electromagnetic wave technique, which comprises the following parts: metal resonance cavity, weight sensor, conveying belt and computer. The method comprises the following steps: (1) putting the egg with different filling weighs and freshness in the metal resonance cavity; measuring the ªñf and attenuation of electromagnetic signal; storing the list in the computer to finish the scaling and calibration course; (2) reading the ªñf, attenuation of electromagnetic signal and temperature from the computer when the egg enters into the resonance cavity; obtaining the disposed egg freshness on the conveying belt through checking the graph.

The invention discloses an online measurement device and an online measurement method of double-pressure difference gas-liquid flow rate. The online measurement device comprises a Venturi flowmeter; a gas-liquid pipe is arranged at one end of the Venturi flowmeter; the gas-liquid pipe is connected with a V-cone flowmeter through a connecting flange; a first pressure gauge is arranged at the front end of the Venturi flowmeter; a second pressure gauge is arranged at the throat part of the Venturi flowmeter; a fourth pressure gauge is arranged at the rear end of the V-cone flowmeter; a third pressure gauge is arranged at a position, between the fourth pressure gauge and the connecting flange, on the V-cone flowmeter. During an actual online gas-liquid flow rate measurement process, respective pressure differences of the Venturi flowmeter and the V-cone flowmeter in a pipeline are acquired and are transmitted into a processor; a gas-liquid two-phase flow rate measurement model is established in the processor; respective flow rates of a gas phase and a liquid phase are calculated and outputted according to the measured pressure differences and by combining the physical parameters of the pipeline and a fluid inputted through a human-computer interface; the online measurement device and the online measurement method have high measurement stabilities.

The invention discloses a multifunctional high-accuracy electronic balance. The internal structure of the electronic balance comprises an electromagnetic force balance sensor, a photoelectric detection circuit, a proportion integration differentiation (PID) regulation circuit, a signal modulation circuit, a data collection circuit, a microprocessor master control module and a temperature detection module. The electromagnetic force balance sensor, the photoelectric detection circuit and the PID regulation circuit form a closed system to improve accuracy and stability of the electronic balance. The multifunctional high-accuracy electronic balance is novel in design and convenient to operate. Due to adopting the electromagnetic force balance sensor and utilizing the null method principle to weigh quality of weighed object, the multifunctional high-accuracy electronic balance has excellent performance of being high in measurement accuracy, good in measurement stability and capable of performing continuous and repeated measurement. Besides, the multifunctional high-accuracy electronic balance further has functions of being various in measurement type, and capable of achieving full-automatic calibration and self-diagnosis of breakdown.

The invention discloses a satellite-borne cable-net-foldable antenna profile accuracy measurement method. The method specifically includes the following steps of preparation work conducted before antenna measurement, picture taking, measuring point coordinate calculation achieved by leading in a measurement device, coordinate conversion, surface fitting, and antenna profile accuracy calculation. The method is high in measuring efficiency and speed, and one-time measurement time of a cable net type foldable antenna is about one hour; devices are convenient to use and easy to disassemble and assemble, and less time is spent on the early-stage preparation work; non-contact type measurement is conducted, and no direct contact with the reflection face of the antenna is needed in the measurement process; the measurement stability is high. The method is not prone to interference of environment factors; the measurement accuracy is high, the maximum measurement error is 0.2 mm, and the measurement requirement of the foldable antenna can be completely met; compared with other measurement methods, the measurement cost is low.

A perforating bullet height automatic measuring device comprises a conveying belt, a digital dial gauge, a connecting frame, an air cylinder and a support. The perforating bullet height automatic measuring device is characterized in that the support is formed by a support upper panel, a support lower panel, a supporting column and a support vertical board provided with an approach switch, wherein the support upper panel and the support lower panel respectively support and position the air cylinder and the digital dial gauge, the upper end of the connecting frame is closely connected with the air cylinder, and the lower end of the connecting frame is movably connected with the digital dial gauge. A movable panel is arranged on the connecting frame, and an upper limit rod and a lower limit rod are respectively arranged on the support upper panel and the movable panel, wherein the upper limit rod and the lower limit rod can limit the vertical motion range of the movable panel. The air cylinder, the digital dial gauge, the conveying belt, the approach switch, and a computer are respectively electrically connected with a programmable logic controller (PLC). The digital dial gauge is enabled to be kept still and a measuring rod is enabled to move in a limited range during the measuring process, the air cylinder simply plays the role of pulling and pushing the connecting frame, and automatic measuring of the perforating bullet height on an assembly line is achieved through the controlling of the PLC. The perforating bullet height automatic measuring device is high in efficiency, low in cost and good in measuring stability.

The invention discloses a method for measuring a soil soluble organic carbon isotope. In the method, an EA-IRMS method is adopted. The method comprises the following steps: firstly, extracting soil water-soluble organic carbon through a multi-water to soil mass ratio method to obtain a solution containing the soil water-soluble organic carbon; then, concentrating the obtained solution through freeze drying; adding purified water into concentrated substances for re-dissolving, drying and measuring delta<13>C through EA-IRMS. The novel method for measuring the soil soluble organic carbon isotope provided by the invention is rapid and efficient, is easy and convenient to operate, and has high measuring accuracy.

The invention discloses an interferometric full optical fiber sensor for simultaneously measuring the temperature and the strain based on an FP-MZ structure. The end faces of single-mode optical fibers are corroded by adopting 40 percent hydrofluoric acid to obtain an optical fiber FP structure; tail fibers of the optical fiber FP are subjected to fusion welding by using a taper waist expansion fusion welding technology to obtain an optical fiber MZ interference structure; a sensor for simultaneously measuring the temperature and the strain is produced, temperature and strain sensing characteristics are tested and analyzed, and a mathematical model between the temperature and the strain of the system and wavelengths of a reflection spectrum and projection spectrum is established; the change of dual parameters, namely external temperature and strain can be simultaneously monitored by a sensing coefficient matrix of the system. The sensor has the advantages of simple structure, low production cost, good measuring stability, cross sensitivity to stress and temperature and higher reference value; meanwhile, the sensor has important application value in aeronautics and astronautics, biomedical detection, large-scale building health monitoring and the like; the problem that a traditional sensor only measures a single parameter is changed.

The invention discloses a pulse signal frequency measurer, and mainly solves the problems that an pulse signal frequency measurer in the prior art is easily affected by the precision of a hardware system and clutter interference, and the measurement accuracy is poor. The pulse signal frequency measurer comprises an A/D unit, a signal processing unit and an interface unit; the A/D sampling unit modulates an input intermediate-frequency pulse signal and sends the intermediate-frequency pulse signal to the signal processing unit for demodulation; the signal processing unit comprises a micro-processing module (1), an operation processing module (2), a frequency conversion control module (3), a data transmission module (4) and a monitoring module (5), the micro-processing module (1), the operation processing module (2), the frequency conversion control module (3), the data transmission module (4) and the monitoring module (5) are used for calculating the pulse frequency, pulse repetition frequency and pulse width information of the intermediate-frequency pulse signal and a frequency output value of an external frequency-hopping source and sending the pulse frequency, pulse repetition frequency and pulse width information of the intermediate-frequency pulse signal and the frequency output value of the external frequency-hopping source to the interface unit; the interface unit sends calculation results input by the signal processing unit to a display control unit of an external upper computer for use. The pulse signal frequency measurer has the advantages that the measurement of the pulse frequency is high in accuracy and faster in speed, and the pulse signal frequency measurer can be used for meteorological radar integrated test equipment.

The invention relates to a magnetostrictive displacement sensing flowmeter. The magnetostrictive displacement sensing flowmeter comprises a sensor electronic bin, a transitional joint, a groove cover, an overflow groove, a metering barrel, a valve block, a damping washer, a straight joint, a measuring wave guide tube and a magnetic ring buoy. The magnetic ring buoy is driven to move in the up-down direction by change of the liquid level of leakage oil, a magnetostrictive effect of a magnetostriction material is achieved, the measuring wave guide tube deforms elastically so that a mechanical wave which is expanded towards two sides is generated, the mechanical wave is received by the sensor electronic bin which is connected with the upper end of the measuring wave guide tube and is converted into an electric signal, and the volume flow of the leakage oil is calculated by comparison and conversion. Owing to the magnetostrictive effect, the magnetostriction property of the magnetostrictive displacement sensing flowmeter is not changed along with time. The magnetostrictive displacement sensing flowmeter has the advantages of high stability, high reliability, high response speed, high resolution precision, non-contact measurement, zero abrasion, long service life and the like. Moreover, the magnetostrictive displacement sensing flowmeter is particularly suitable for measuring micro flow.

The invention relates to a voltage signal acquisition device of an on-line type aluminum electrolytic cell anode current distribution measurement system. The aluminum electrolytic cell anode voltage signal acquisition device comprises millivolt voltage measurement probes (1) and a millivolt voltage monitoring support (6), wherein the millivolt voltage monitoring support (6) is a strip-shaped plate, edgefold parts (7) are arranged at one end or two ends of the millivolt voltage monitoring support (6), insulation plates (2) are installed on the edgefold parts (7), and the two millivolt voltage measurement probes are installed on the insulation plates (2). An aluminum electrolytic cell anode conducting rod voltage measurement device is reasonable in structure, reliable in performance, and low in cost, a measured millivolt voltage signal of each electrolytic cell anode conducting rod is transmitted to a millivolt voltage signal processing unit nearby an electrolytic cell through a high-temperature-resistant signal shielding conductor, and on-line continuous monitoring of aluminum electrolytic cell anode current distribution can be achieved.

The invention relates to a flexible plantar pressure detection device and shoes. The device comprises a flexible substrate layer, a functional layer, a flexible packaging layer and a processing module. The functional layer is arranged on the flexible substrate layer and comprises a plurality of flexible piezoresistive sensing units, a plurality of flexible piezoelectric sensing units and extensible wires for connecting the plurality of flexible piezoresistive sensing units and the plurality of flexible piezoelectric sensing units to the processing module; the flexible packaging layer is located above the functional layer and packages the functional layer together with the flexible substrate layer; and the processing module is used for collecting signals of the multiple flexible piezoresistive sensing units and the multiple flexible piezoelectric sensing units to obtain multiple piezoresistive signals and multiple piezoelectric signals so as to obtain plantar stress data according to the multiple piezoresistive signals and the multiple piezoelectric signals. The device has the characteristic of a piezoresistive and piezoelectric double-measurement mechanism, and is low in cost, longin service life, wide in measurement range, high in sensitivity, and capable of collecting the signals anytime and anywhere without being limited by different external environments, human body movement ranges and human body sole structures.

The invention discloses a low-moisture industrial material lossless detecting method of electromagnetic wave technique, which comprises the following parts: metal resonance cavity, hollow dielectric tube and computer, wherein the metal resonance cavity is thermostatic and driven by electromagnetic wave; the hollow dielectric tube is set in the metal resonance cavity. The method comprises the following steps: (1) putting the coal powder with different filling densities and water in the metal resonance cavity; measuring the ªñf and attenuation of electromagnetic signal and coal powder temperature; storing the list in the computer to finish the scaling and calibration course; (2) reading the ªñf, attenuation of electromagnetic signal and temperature from the computer when the coal powder flows through the hollow dielectric pipe; obtaining the disposed coal powder moisture in the dielectric pipe time through checking the graph. The invention confines the error result of 0.31-1.49 percent moisture content less than 0.16 percent, which is a non-touchable measurement.