171 results about "Relative variation" patented technology

A capacitive position sensor has a periodic array of electrodes which form capacitors between pairs of the electrodes. The location of a dielectric inhomogeneity in the vicinity of the sensor is determined by comparison of the relative change in the capacitance of the capacitors. The comparison may be carried out using a capacitive Wheatstone Bridge arrangement. The sensor configuration has the advantage that it is independent of the absolute value of the dielectric constant of the environment in which the sensor is located.

A method of determining the gain characteristic of a Raman amplifier includes the steps of launching a pump light signal into a fiber; preliminary adjusting the power of the pump light signal to a value that lies in a range where the amplified spontaneous emission noise originating from the pump light signal is substantially proportional to the on/off gain provided by the power of the pump light signal; monitoring the power of the amplified spontaneous emission noise signal; varying the power of the pump light signal; measuring a variation in the power of the amplified spontaneous emission noise signal corresponding to the pump power variation; and determining the gain characteristic of the amplifier from the relative variation in pump power and the measured variation in noise power.

There is provided a method and a device for accurately estimating traffic information of a link having no traffic information even if different types of roads are mixed. The device finds a parameter characterizing a damping curve of a quantity of change of relative speed based on stored traffic information for links on a city center side on a minimum-time cost route connecting the city center and suburbs, finds a quantity of change of relative speed of the link having no observed traffic information and estimates its traffic information based on the damping curve. The device also calculates a ratio of quantities of change of relative speed of two links whose road types change as a speed change similarity ratio and estimates traffic information of the link of a second road type from known traffic information of the link of a first road type by using that ratio.

A particle-optical apparatus is proposed as well as a method for operating the same. The particle-optical apparatus provides a magnetic field for deflecting charged particles of a beam of charged particles and comprises a body of a material with a permeability number around which a current conductor at least partially engages and a temperature-adjusting unit -for adjusting a temperature of the magnetic-flux-carrying body substantially to a nominal temperature. A relative variation of the permeability number relative to a width of a temperature range is to be smaller than a limit value a, wherein a is preferably smaller than 3.10<-3>K<-1>. In particular, the nominal temperature is at an extremum of a temperature dependence of the permeability number. Preferably, such a particle-optical apparatus can be employed in a microscopy or a lithography apparatus.

The invention discloses a key-judging method for capacitive touch keys, comprising the steps of: setting an entropy coefficient; scanning keys to obtain a count value of the first charging time of a charge and discharge capacitor; dividing the count value of the first charging time into the entropy coefficient to obtain a first relative quantity reflecting the equivalent capacity of a touch key; scanning the keys again to obtain a count value of the second charging time of the charge and discharge capacitor; dividing the count value of the second charging time into the entropy coefficient to obtain a second relative quantity reflecting the equivalent capacity of the touch key; obtaining a difference value between the second relative quantity and the first relative quantity, and judging the keys by utilizing the difference value. In the key-judging method, the keys are judged by obtaining the relative variation quantity of the charging time of the charge and discharge capacitor C1. Therefore, the difference of stray capacitance on a PAD of a PCB cannot influence key judgement. The method is simple in realization and greatly reduces the requirements and the difficulty for PCB and software algorithm treatment.

The present invention is automatic evaporator defrosting on-off control method. The relative change in wind speed through the evaporator before and after the defrosting of the evaporator is used in controlling the start and the stop of defrosting. The method has the advantages of no need of measuring thickness of frost, no difficulty in measuring average thickness of frost layer, the reasonable determination of the defrosting on and off time based on only the air flow speed, and capacity of ensuring excellent heat transferring characteristic of the evaporator and the efficient operation of the refrigerating system.

In wrapping a blood pressure measurement cuff enclosing therein a bladder, which is inflated when supplied with air, around a region for measurement, first, a predetermined amount of air is supplied to the bladder and then enclosed therein. Then, the blood pressure measurement cuff is wrapped around the region for measurement of a subject for the purpose of measuring his/her blood pressure. During this wrapping process, relative variations in the pressure in the bladder are sequentially detected. The time period in which the detection results indicate that the variation has not reached a predetermined threshold value, the wrapping proceeds. When the detection results indicate that the variation has reached the predetermined threshold value, the wrapping is terminated.

The invention discloses a method and a device for judging optimal the time of stroke of a pumping unit. The method comprises the following steps of: obtaining a current load displacement indicator diagram according to data of load and displacement sensors; changing the time of stroke, re-collecting the load displacement data to obtain the changed load displacement indicator diagram after the changing of the time of stroke; calculating relative liquid yield according to the ground indicator diagram before and after the changing of the time of stroke, judging the variation situation of the ratio of; and continuously running the programs until the minimal time of stroke is obtained under the maximal daily liquid yield, i.e., the optimal time of stroke is obtained. The device mainly comprises the load sensor, the angular displacement sensor, an RTU (remote terminal unit), a frequency changer, and on the like. Due to the fact that the optimal time of stroke judging program adopts the relative variation value of the daily liquid yield instead of the absolute value of the daily liquid yield, so the program is low in computing amount and small in occupied internal memory, and is capable of directly running on the RTU, further, the pumping unit can finish the data collection, computation and control independently by self without depending on the computation and the control of a host computer, and the system is ensured to run more reliably.

A method for inspecting a surface of a moving strip to detect surface defects, which includes forming at least one digital picture of at least one face of the strip, in which the digital picture is made up of a set of successive rows of picture elements, each of which is assigned a digital value. The method also includes filtering the at least one digital picture to detect surface irregularities by detecting relative variations in the digital values, and processing the at least one filtered digital picture to identity a type of surface defect corresponding to each detected irregularity. Further, prior to the processing step, an overall characterization of each of the irregularities is performed by determining, a value of predetermined parameters characteristic of surface defects, and a prior classification of the irregularities is performed based on the determined values of the parameters, according to a set of predefined classes. The processing step is performed on each class, and the predetermined parameters characteristic of the surface irregularities is less than a total number of parameters used to identify the defect.

The invention relates to the technical field of intelligent sensing and particularly discloses a Brillouin scattering signal processing method and a distributed fiber sensing system thereof. The system comprises a sensing fiber, a laser signal source, an annular device, a detection pulse optical path modulation module, a frequency shift reference optical path modulation module, a coherent detection unit and a data acquisition processing module, so relative variation quantity of Brillouin frequency shifts can be precisely acquired, backward Brillouin scattering spectrums are acquired and the complete Brillouin scattering spectrum is obtained. The method comprises steps of firstly, establishing a detected Brillouin scattering signal spectrum model; and using a fast iteration algorithm based on numerical optimization to carry out characteristic extraction on the Brillouin scattering spectrum. In the method, scattering signal frequency spectrums obtained through frequency scanning of each time are fit, so sensing information of temperature or stress distributed along the fiber is precisely acquired. A solving method has strong global searching ability, so algorithm action time is shortened and measurement precision and timeliness of the system are effectively improved.

An information storage device having a hard disk has a metal probe that is brought closely to the surface of a multilayer film that includes a magnetic metal layer, a non-magnetic metal layer, and a magnetic metal layer up to a nano-meter order distance from the surface. The distance between the metal probe and the surface of the multilayer film, as well as the voltage to be applied are changed to change the state of the quantum well generated in the multilayer film, thereby changing the magnetizing direction relatively between the two magnetic metal layers. To read magnetization information from the hard disk, a change of an optically induced tunnel current is used. The change of the tunnel current is caused by a change of a plasmon resonance energy according to a relative change of the magnetizing direction between the magnetic metal layers.

A source synchronous external memory device returns data to a memory controller of an electronic device with its own clock signal, which allows the returned data to be captured with a high degree of accuracy. The captured data must then be resynchronized with the clock signal which controls the other components of the electronic device. This problem is particularly acute in the case of high speed memory devices, such as DDR (Double Data Rate) memory devices, and similar memory devices. Test data is written to the external memory device, and is then read back several times. Attempts are made to resynchronize the captured data with the system clock, with different relative variations in the phase of the captured data and the system clock, in order to select a value for the relative phase, which allows for optimum resynchronization.

The invention discloses a rehabilitation robot control method based on joint stiffness and muscle fatigue. According to the rehabilitation robot control method, the joint angle signals and the surfaceelectromyogram signals of a subject are collected, individual physiological parameters of the muscles are identified through a genetic algorithm in combination with a positive and negative dynamics principle, a personalized joint skeletal muscle model is established, and joint stiffness information in the moving process is calculated; the median frequency of the surface electromyogram signal in the moving process is calculated, and the fatigue information of the subject is acquired by utilizing the relative variation value; and self-adaptive adjustment is carried out on the parameters of an impedance model by adopting the joint stiffness information and the motion fatigue information, meanwhile, the rigidity and the damping parameters are restrained through a saturation function, and theself-adaptive impedance control method of the rehabilitation robot is realized. According to the rehabilitation robot control method, the rigidity information related to joints and the fatigue information related to the muscles are considered at the same time, the rigidity information and the fatigue information are introduced into the rehabilitation robot for control, the safety of joints and muscles in the rehabilitation training process can be considered, and safe and effective rehabilitation training is realized.

The invention provides a device and method for measuring the oil consumption of an engine. The measuring device is composed of an oil filling tank, an observation window, an oil drain valve, an oil collecting tank, a vent pipe, a lifting platform, a camera, an electronic scale and the like. During measurement, when the working condition is in stable operation, the engine oil liquid level is relatively stable, and an oil level line which is flush with a valve opening in a visual oil level pipe is used as the basis reference. On the basis of the variation of the relative quality of engine oil added into the engine within a testing time period, the oil consumption of the engine within the testing time period is tested, and the relative variation of the oil weight is accurately measured through the accurate measurement and the zero clearing operation of the electronic scale. Meanwhile, measurement is conducted under the state that the engine is not stopped, the influence of operation condition difference of the engine and the oil storage amount difference of a filter under different working conditions on the oil consumption measurement result is avoided, and the measurement precision of the oil consumption of the engine is improved. In the testing process, it is guaranteed that the oil in the engine is placed above the normal operation liquid level, and the engine is prevented from being damaged.

A variable valve control system for an internal combustion engine including a plurality of cylinders, the variable valve control system including a variable lift characteristic control mechanism to adjust a valve lift characteristic of each of intake valves. The variable valve control system is configured to perform determining an engine condition indicator in correlation with an actual relative variation in the valve lift characteristic between the cylinders; determining a desired valve lift characteristic in accordance with an operating condition of the internal combustion engine; controlling the valve lift characteristic of each of the intake valves in accordance with the desired valve lift characteristic; determining the engine condition indicator when the desired valve lift characteristic is equal to a predetermined small valve lift characteristic setting; and expanding the small valve lift characteristic setting if the determined engine condition indicator is larger than a predetermined first threshold value.

The invention provides a Raman spectrum method for identifying black handwriting, wherein, the method adopts ultraviolet laser light as an excitation light source; fluorescence is avoided through adopting ultraviolet laser light which directly irradiates handwriting; the Raman spectrum signals of corresponding handwritings on a detected material and a sample are respectively collected; whether the ink compositions of the handwritings are different or not can be identified from the difference of Raman peaks through comparison; moreover, the different written times of the handwritings can be identified through the relative variation of corresponding Raman peak strength. As for black handwriting containing carbon black, the forming time can be judged according to the ratio of the integral area of the Raman characteristic peak at 1600cm<-1> and the integral area of newly written handwriting at the same position. The method which is of great convenience realizes objective and actual identification without any damage on identified handwriting.

A washing machine having a balancer and a control method thereof which achieve correct communication between a controller and a balancing module such that a balancing module is correctly shifted to a target position. The control method of the washing machine includes measuring a first time between position detection time points of the balancing modules during rotation of the rotary tub when the plurality of balancing modules is in a static mode, measuring a second time between position detection time points of the balancing modules during rotation of the rotary tub when any one of the balancing modules is shifted by a predetermined distance through a movement command, and confirming a relationship between a module ID of any one of the balancing modules and a communication ID of the movement command through a relative variation of the second time with respect to the first time.