227results about How to "Eliminate drift" patented technology

A portable sensor system that uses acceleration-insensitive, three-dimensional angle sensors located at various points on the patient's body, and collects data on the frequency and nature of the movements over extended periods of time.

A transmitter emits high-frequency modulated optical radiation which is reflected by an object and is received by a measurement receiver. Part of the transmitter radiation is decoupled as reference radiation and guided via a calibration path to a reference receiver whose electrical signals are fed to a frequency mixer. The frequency mixer and avalanche photodiodes acting as measurement receivers of the measuring radiation are interconnected directly via an electrical connection line upon which a mixer frequency acts. As a result thereof, optoelectronic calibration which completely compensates for the temperature-dependent phase shifts of the avalanche photodiodes is possible. Additionally, the phase shifts generated in the reference and receiver signals by the temperature drifts of the transmitter compensate one another. The overall accuracy of the distance measurement can be increased, particularly for short measuring times and immediately after the apparatus has been switched on. Furthermore, in comparison with a successive mechanical calibration process, the measuring times are halved and advantages in terms of weight, cost, and reliability are afforded since a mechanical change-over device is dispensed with.

A method for matching a photographic image with related identifying data, including the steps of creating a digital image that includes a datafile containing image time data, generating a signal when the digital image is created, and storing in a digital storage device identifying information relevant to the digital image. The identifying information also has information time data associated therewith. A signal is transmitted to the digital storage device and a time stamp is applied to the signal at the digital storage device. The image time data is stored in the digital storage device in time sequenced order. The image time data and the information time data are synchronized, and the digital image is associated with the identifying information by matching the synchronized image time data and the information time data.

The invention relates to a high-precision multi-frequency phase-synchronized laser distance measurement device and method, relates to the technical filed of laser measurement, and mainly relates to a phase laser distance measurement technology. In the invention, the problem that a device and a method capable of realizing both synchronization and stability of multiple measurement gauges are in shortage in the phase laser distance measurement technology is solved. The high-precision multi-frequency phase-synchronized laser distance measurement device comprises a dual-longitudinal-mode frequencystabilization He-Ne laser, a multi measurement gauge generation unit, a beam expanding collimating mirror group, a measuring light path and circuit unit and a control casing unit. The high-precision multi-frequency phase-synchronized laser distance measurement method specifically comprises the following steps of: 1, starting the dual-longitudinal-mode frequency stabilization He-Ne laser; 2, taking one beam of laser as a reference laser beam and the other beam as a measurement laser beam; 3, taking [(f'+f2)-(f+f1)] as the frequency of an accurate measurement gauge and taking (f1-f2) as the frequency of a coarse measurement gauge; 4, moving a measurement corner-cube prism to a target end; 5, obtaining a phase difference phi p; 6, obtaining a phase difference phi c; and 7, obtaining the distance. Thus, the method and device disclosed by the invention can be used for laser distance measurement.

A sample cooling apparatus capable of cooling and holding samples or wafers at a cryogenic temperature with no vibration or drift with respect to a measurement reference surface is disclosed. In the sample cooling apparatus, a sample holder is arranged in a vacuum vessel mounted on a housing having a table for forming a measurement reference surface to be supported by a thermal insulator. A frame is disposed within the housing to be supported by a first buffer. A refrigerating machine is disposed in the frame to be supported by a second buffer and has a head directed to the vacuum vessel. The cooling head of the refrigerating machine is connected to the sample holder by way of a flexible thermal conduction member.

The invention provides an interference optical fiber gyroscope. The interference optical fiber gyroscope comprises a light source, a coupler, two signal detection optical paths, a linearly polarized light generation optical path and a polarization maintaining optical fiber ring, wherein the light source is connected with the coupler through an optical fiber; the two output ends of the coupler are connected with one signal detection optical path in the two signal detection optical paths through an optical fiber respectively; and the two signal detection optical paths are connected with the polarization maintaining optical fiber ring by optical fibers through the linearly polarized light generation optical path.

There is provided a liquid-gas contact device which has a liquid distributor (2) provided in the upper portion of the device, a liquid collector (3) provided in the lower portion of the device and an internal structure between the liquid distributor (2) and the liquid collector (3) which defines a plurality of flow paths. The liquid-gas-contact device includes a column packing (5) constituting the internal structure made of a plurality of column packing constituting elements (6) each of which extends vertically in parallel to each other in a non-contact state and in a non-contact state with an inner wall of the device, a plurality of adaptors (4) connecting the liquid distributor (2) with the column packing (5) for supplying liquid from the liquid distributor (2) to the column packing (5), and a plurality of collectors (7) connecting the column packing (5) with the liquid collector (3) for supplying liquid from the column packing (5) to the liquid collector (3).

A packaging method comprises the steps of: providing a carrier plate, wherein the carrier plate comprises a plurality of chip regions and cutting regions arranged between the adjacent chip regions, the carrier plate further comprises a first surface, and a plurality of grooves are formed in the cutting regions in the first surface of the carrier plate; providing chips, wherein each chip comprises a functional surface and a non-functional side surface which are opposite to each other, the surface of each functional surface is provided with bumps, and the bumps protrude out of the functional surfaces; fixing the non-functional side surfaces of the chips with the first surface of the carrier plate in the chip regions; forming a plastic packaging layer on the first surface of the carrier plate and the surfaces of the chips, wherein the plastic packaging layer exposes top part surfaces of the bumps; removing the carrier plate after forming the plastic packaging layer; forming a rewiring structure on the surface of the plastic packaging layer and the functional surfaces of the chips; and cutting the plastic packaging layer and the rewiring structure, so that the plurality of chips are separated from one another, thereby forming an independent packaging structure. The yield and reliability of the formed packaging products are improved.

The invention discloses an interference correction and concentration inversion method of multi-component gas analysis, which comprises the following steps: a reference filter channel is used for eliminating the system drifting because of external factors; the water vapor is utilized to correct the interference of the water vapor of an analysis meter in the service environment on the interference functions of the other filter channels; the cross-correlation functions are utilized to obtain the pure absorbance of various target gases in the mixed gas by establishing and solving a multivariable interference equation set, and the cross interference among the target gas is corrected; and after the interference is corrected, the response functions of each filter channel are utilized to inverse the concentration of the target gas. After a simple non-dispersion infrared analysis meter utilizes the interference correction and concentration inversion method provided by the invention, a detectoris used for simultaneously and accurately detecting the concentration of various polluted gases such as CO2, CO, NO, NO2, SO2, CH4, N2O, HC, H2O, NH3, H2S and the like.

The intelligence valve electrically controlled installment belongs uses the sensor monitor and the micro electron technology control valves uses the electrically operated installment. The main characteristic is: In the mechanism which has has partially established the non- electronic contact type examination output shaft torque value the strength value sensor and the examination valve operates the electro-optical sensor, in the electric motor supposes the temperature sensor; Its electric control are partial is the modular microcomputer control system, in is equipped with AVR high speed to insert the type monolithic integrated circuit the controller module, receives various sensors the monitor signal to control the power control module after processing, then control motor active status. This invention solved the traditional technology to plant the structure complex, security bad, difficult problem and so on reliability, this equipment was the light integration of machinery high tech product, its structure simple, security good, precision high, the reliability was high, could to the valve entire work process realization automatic monitor and the monitoring.

The invention provides a small-diameter directional gyro inclinometer for drilling. The small-diameter directional gyro inclinometer consists of an aboveground control device and an underground measurement device. The underground measurement device comprises an inertial short section based on a flexible gyro, wherein the inertial short section of the gyroscope includes a sensor consisting of two small flexible gyros with two degrees of freedom and three orthogonal quartz accelerometers; the two small flexible gyros with two degrees of freedom are orthogonal to each other and are connected with each other through a rotary frame; the three orthogonal quartz accelerometers are connected with one another through the rotary frame; and the gyros and the accelerometers are directly mounted on an inertial body through a location plane to constitute an inertial measurement assembly which is supported on a casing through a pair of bearings. The angles of the inclinometer in the three axial directions can be obtained by resolving an inertial navigation equation during logging so as to obtain the real-time well measurement information and output the azimuth information of an oil well. The small-diameter directional gyro inclinometer has the advantages of small size, low cost, high accuracy, high measurement speed, continuity in measurement, high reliability, high resistance to temperature and pressure, and wide application range.

The invention relates to a vibration mirror electric machine, comprising stator, rotor rotating relative to the stator, and position feedback device for feeding back rotation position of the rotor, where the position feedback device is a grating encoder. And it uses the grating encoder to eliminate the problem that system performance is not stable caused by zero position and gain drift of traditional capacitance or inductance vibration mirror electric machine. Besides, it adopts multipolar slotless electric machine structure to increase response speed of the vibration mirror electric machine.

The invention discloses a network time synchronization device, system and method, the method includes following steps: step A: the business device sends the time request to at least one time sever at intervals of time; step B: compares the time samples returned by the time sever, choose the time sample to calculate the time difference between the local time and the time sever; step C: according to obtained time difference data to adjust the frequency regulator in the business device, and locks the time of superior time sever. Using the invention, it can obtain the time information of superior time sever via the transmission network, and according to the time information obtained in different time it can calculate the shift of local oscillator, and it can eliminate the local time shift by adjusting the frequency regulator to satisfy the requirement for the time of business device.

The invention provides a laser beam common aperture power synthesizing system based on light beam stable closed-loop control. Aiming to solve the technical problems, light beam high-precision synthesis is carried out by a light beam stable closed-loop control method aiming to two paths of laser beams with different wavelengths. Two paths of laser respectively pass through respective tilting mirrors and transmission mirrors and the light beam coupling is realized on a synthesizing mirror; meanwhile, appointed error information of each path of the light beam is detected by a synthesizing sensor through a manner of beam splitting and imaging of a dispersion element; the appointed error information of the light beam is converted into driving voltage through calculation and treatment to drive the tilting mirror to carry out angle deflection to eliminate an appointed error of the light beam; finally, high-speed and high-precision synthesis of a plurality of paths of the light beams is realized and the power density of a target point is improved; and the path quantity of the synthesizing light beams can be expanded according to actual requirements. The laser beam common aperture power synthesizing system based on the light beam stable closed-loop control, can be used for fields of material science, nuclear industry, machining, scientific researches and the like, has the advantages of good continuity, high stability and strong anti-interference capability, and is suitable for high-precision incoherent synthesis of a plurality of paths of the light beams under long-time continuous working conditions.

The invention discloses a signal conditioning circuit for an acceleration sensor with a high g value. The signal conditioning circuit is composed of an isolation amplification circuit, an alternating-current coupled circuit, a first voltage following circuit, a voltage bias circuit, a low-pass filter circuit and a second voltage following circuit sequentially connected in series; the isolation amplification circuit is used for performing signal isolation amplification and power supply isolation of a sensing signal Signal_in output by the acceleration sensor with the high g value and then outputting an isolation amplified signal Signal_out1; and the low-pass filter circuit is a unit gain two-order voltage-controlled voltage source low-pass filter circuit constructed by utilizing an integrated operational amplifier. According to the invention, the signal waveform can be improved; frequency confusion while discretizing is prevented; adverse effects of noise are overcome in the event that the signal and a noise spectrum are not overlapped; the signal to noise ratio is increased; furthermore, aiming at different attack targets, sensor signals can be effectively modified; preceding-stage analogue signals easy to identify and process are provided for a burst control algorithm precisely damaged by a hard target penetration warhead; and the signal conditioning circuit can stably work in a 100000g impact environment.

The invention relates to a multifunctional measurement and control module based on a field bus, comprising a multi-path selection module, a signal conditioning module, an isolating and amplifying circuit, an A / D conversion and control module that are sequentially connected. An acquiring signal is input into the multi-path selecting module, then conditioned and converted by the signal conditioning module, sent to the isolating and amplifying module for isolation and amplification, and enters the A / D conversion and control module; a simulating signal is converted into a digital signal by the A / D conversion; and a signal processed by the control module is output by a communication interface with field bus function. By matching the multi-path selecting module with the signal conditioning module, each channel can access a plurality of signals, can be matched with a programmable amplifier by the introduction of a high-accuracy reference voltage, and can be used for measuring the current real amplification factor, thereby eliminating the drift caused by the null drift of the amplifying module.

This invention relates to sea bottom tube creep intelligent controller in intelligent control field, which comprises PC104 bus CPU module, PC104 bus DC / DC power module, PC104 bus CAN communication module, portable inertia guide system, inclination sensor, CF card memory and wireless network module orderly connected, wherein, the PC104 bus communication module is the data process center of intelligent controller to get creep machine position information through testing and computing and to compare the information and management information file load.

The invention discloses a denoising method of an observation signal of an artificial-source electromagnetic-method. The method includes: firstly, carrying out fast Fourier transform (FFT) on the noised signal, removing power-frequency interference in a frequency-domain signal, and returning to a time domain after inverse Fourier transform; then carrying out EEMD (Ensemble Empirical Mode Decomposition) on a time-domain signal after removing the power-frequency interference, and attenuating signal baseline drift; and finally, further correcting the baseline drift of the signal on the basis of shift-invariant sparse coding (SISC), and removing other human noises. According to the method, power-frequency interference noises, baseline drift noises and the human noises of pulses and the like ofwhich amplitude is much larger than that of a useful signal can be effectively removed on the premise of not losing the useful signal, the strong noises are allowed to exist in an entire process fromobservation starting to ending, and thus the artificial-source electromagnetic-method is enabled to be used for observation under an environment of continuous and strong interference.

The invention discloses a variable optical attenuator-based bus current detection method and current transformer equipment. The method comprises the following steps: generating monitoring light and sensing light by a monitoring light source and a sensing light source respectively, wherein the sensing light passes through a variable optical attenuator to generate an attenuated optical signal, is subjected to photoelectric conversion with the monitoring light respectively and then is input into a single-chip microprocessor for algorithmic processing so as to generate a secondary current signal; meanwhile, acquiring a bus current signal on a high-voltage line by using a primary current sensor, and differentiating, filtering and amplifying with feedback electric signals of an input signal and an output signal of the variable optical attenuator to generate a new driving signal for driving the variable optical attenuator. The equipment comprises the monitoring light source, the sensing light source, the variable optical attenuator, two wavelength division multiplxers, two photoelectric receivers, the single-chip microprocessor and a photoelectric feedback control module, wherein the photoelectric feedback control module comprises two photoelectric receivers, a differential module, a filter circuit and an amplifying circuit.

This invention relates to a kind of fiber-optic gyro transition time's testing method, adopting square wave that complete alternation is given and twice greater than fiber-optic gyro eigenperiod estimated value to process phase modulation to fiber- optic gyro system; take spectral analysis of output signal of now time, gain the spectral distribution; then through data processing to gain systemic transition time. The invention could use high speed sample circuit to take sample from system output signal, to gain sampling sequence composed by a series of sampling cost, and through processing spectral analysis to this sampling sequence to get the spectral distribution; also can directly utilize frequency response analyzer to process spectral analysis to systemic output signal. According to system output signal's spectral distribution, to judge amplitude crossover point position corresponding spectra of spectral distribution, by format to obtain systemic transition time. This method can accurately gain systemic transition time parameter, thereby advance fiber-optic gyro's static state performance, depress systemic drift error.

The invention discloses a method for rapidly determining the content of multi-index components in a sample feeding and eluting process of a Chinese buckeye seed extractive, namely sodium aescinate, in macro-porous resin and rapidly judging an eluting terminal point. The method comprises the following steps: (1) scanning near infrared spectrums and collecting a macro-porous effluent liquid sample; (2) determining the content of the multi-index components in a sample by using a reference method; (3) establishing a near-infrared multi-element correction model in a macro-porous purification process; (4) carrying out model evaluation; and (5) rapidly judging the eluting terminal point. The method provided by the invention has the advantages of rapidness, no loss, capability of simultaneously detecting a plurality of components and the like, can be used for an online analysis of a traditional Chinese medicine production process, and provides a novel thought for production and quality control of traditional Chinese medicines.

The invention provides a positioning system based on a machine vision and a dynamic fingerprint and a corresponding method. The positioning system comprises an image collection device, a wireless access device, a server and a wireless beacon. During the usage, the wireless beacon is installed on a positioning object; the image of the positioning object is collected through the image collection device and a wireless signal is received through the wireless beacon; position information and a signal strength data flow are generated; and positioning is performed based on the two data flows. The invention combines the advantages of image positioning and wireless signal positioning and enables the two positioning modes to compensate each other to achieve a better positioning effect. The system and the method of the invention adopt the visual positioning under the line of sight condition to obtain the high accuracy positioning, and can dynamically update fingerprint data in real time. The invention improves the positioning accuracy under the non-line-of-sight condition, and guarantees that the accurate positioning service is obtained in the various complex indoor environments.

The invention belongs to the field of spacecraft orbit dynamics and control. The invention discloses a fault detection method of a geostationary orbit electric propulsion satellite, which is realizedby establishing an instantaneous orbit motion model of the geostationary orbit satellite under environmental perturbation. the average orbital motion model is established; the orbital motion model under the action of the controlled force is established. The orbital motion model under all forces is deduced. The fault detector is designed and the convergence of the designed fault detector is verified. The invention also discloses a position maintaining method of a failure mode of a geostationary orbit electric propulsion satellite. On the basis of the satellite failure detecting method, the orbit drift caused by the failure of a thruster is calculated. A control law is designed to correct the orbital drift caused by thruster failure. The discrete control law is used to obtain the switching sequence of the electric thruster. By using the switching sequence, the position maintenance of the GEO electric propulsion satellite in the failure mode is realized. The invention is universally applicable to high-orbit and geostationary orbit electric propulsion satellites.

The invention discloses a method for performing rapid celestial fix through a CCD (charge coupled device) zenith telescope on the ground. According to the method, the CCD zenith telescope is used for imaging a fixed star in a sky region near to the zenith of an observation point twice (the barrel of the telescope rotates by 180 degrees around a rotating shaft during the two times of imaging); precise astronomical longitudes and latitudes of the observation point can be rapidly obtained by processing the two shot fixed star images, the corresponding precise time and inclinometer data. Compared with the conventional generally used satellite positioning method, the method disclosed by the invention has the advantages of full autonomy, high reliability, high invisibility, working safety, no electromagnetic interference and the like. Compared with other celestial fix methods, the method disclosed by the invention has the advantage of high precision. Furthermore, star selection is not needed in the method, so that the observation process is simplified, and the observation efficiency is greatly improved; the shortcomings that the conventional astronomical telescope is complicated in observation and low in efficiency, needs an observation foundation pier and cannot perform mobile observation are overcome. The method has extremely good development and application prospects.

The invention relates to a method for evaluating and predicating the toxicity and the efficacy of a medicament based on an endogenous metabolism signal which is acquired by eliminating an exogenous metabolism signal in a biological sample, in particular to the method for evaluating and predicating the specific toxicity and the non-specific toxicity of the medicament by using a metabonomic technology. In the method, the biological sample depended by a metabolism group is obtained according to a blank control group, a model toxic substance group and a toxicity test group which are set in the metabolism group; and a sample measuring signal matrix is detected and acquired for evaluating and predicating the toxicity of the medicament. The invention simultaneously discloses a method for evaluating and predicating the efficacy by using the metabonomic technology. In the method, a biological sample depended by the met toxic substance group, a treatment group and a positive medicament control group which are set in the metabolism group; and a sample measuring signal matrix is detected and acquired for evaluating and predicating the efficacy of the medicament. According to the methods disclosed by the invention, the toxicity and the efficacy of the medicament can be evaluated more comprehensively and accurately.

The invention discloses an OBS-based method for long-offset distance construction of a shallow water area speed model, and is mainly applied to a sea area with a relatively flat seabed and relativelyshallow water, OBS data collected in such a sea area are often low in signal-to-noise ratio and serious in space alias, combined with the advantages of survey line symmetry observation system design,the method (1) eliminates main clock drift distance through direct wave correction, (2) makes up for the problem that actually collected OBS gather shallow layer is serious in space alias, eliminatesresidual clock drift distance, and also solves the problem of near-offset distance first arrival pickup through forward modeling correction, and (3) solves the problem of comparison verification of medium- and far-offset distance first arrival pick through groups of different offset distances of combinations of different OBS gather through ray reciprocal comparison tracking; accurate pickup of OBS gather first arrival is fully realized; and after first arrival is picked up, a speed model is obtained through inversion during travel. The modeling method provided by the invention can obtain an accurate middle and deep part speed model, the obtained speed model is superior to a speed model obtained through speed spectrum pickup through traditional multichannel earthquake, and thus the methodis of great significance to research of complex structure imaging in oil gas exploration.

A method of automatically determining a sensing timing in a page buffer of a NAND flash memory device is disclosed, which includes the steps of discharging a first reference bit line, discharging a second reference bit line, determining a first control signal and determining a second control signal. To perform the method, an apparatus of automatically determining a sensing timing in a page buffer of a NAND flash memory device is also disclosed. The apparatus includes a first reference bit line, a first current sink, a first reference page buffer, the second reference bit line, a second current sink and a second reference page buffer. The first reference bit line is coupled to the first current sink and the first reference page buffer at both ends thereof. The second reference bit line is coupled to the second current sink and the second reference page buffer at both ends thereof.

The invention concerns a gas analyzer comprising: a measuring volume (2), a radiation source (1) for providing a beam to pass said measuring volume; a heat sink (16) for said radiation source; at least one thermal detector (3) having a hot junction within a support structure and receiving the radiation and a cold junction for reference within the same support structure and protected from said radiation; at least one optical bandpass filter (9) between said hot junction and said radiation source; and a thermal mass (11), which is formed of a material having high thermal conductance. The thermal mass has a cavity with a bottom step (34) and a rim (32), and a first length therebetween. The support structure has a frontal edge (35) and a base plate lip (33), and a second length therebetween. There is a radial gap between the thermal mass and the support structure. Press means urge said support structure in the cavity, whereupon a more efficient thermal contact is either between said frontal edge and said bottom step, or between said base plate lip and said rim. A first thermal barrier (17) is between the heat sink and the thermal mass, and a second thermal barrier (22) surrounds the thermal mass. A shield (19) formed of a material having high thermal conductance covers said second thermal barrier and is in thermal contact with said heat sink.