75 results about "Pulse wave form" patented technology

This invention provides a solar simulator measurement method capable of high-accuracy measurements with fast-response photovoltaic devices as well as with slow-response photovoltaic devices, and a solar simulator for implementing the method. A flash having a pulse wave form with a flattened peak is generated from a xenon lamp 1. The flash is sensed by an irradiance detector 3, its irradiance measured, and the irradiance of the light source is adjusted to fall within a prescribed narrow range based on the detected irradiance value. Then, the flash with irradiance within the prescribed range irradiates photovoltaic devices 4 under measurement, and the current and the voltage output by the photovoltaic devices 4 are measured at multiple points while a load of the photovoltaic devices 4 is controlled. This process is repeated with multiple flashes to obtain an I-V curve for the photovoltaic devices.

The invention discloses a noninvasive continuous human body arterial blood pressure measuring method and equipment. The noninvasive continuous human body central arterial blood pressure measuring method comprises the steps as follows: calculating individualization parameters of a to-be-measured person artery blood vessel network model according to acquired pulse wave forms of radial arteries and brachial arteries; calculating radial artery blood pressure systolic pressure, diastolic pressure and blood pressure wave forms according to radial artery pulse wave speeds and artery blood vessel network parameters; calculating ascending aorta-radial artery transfer functions; further calculating central arterial blood pressure. The noninvasive continuous human body central arterial blood pressure measuring equipment consists of a signal processing and analyzing unit, a pulse wave and motion signal acquisition unit worn on the wrist as well as an electro-cardio and motion signal acquisition unit worn in front of the chest. According to the method and the equipment, electrocardiograms, the radial artery blood pressure, the central arterial blood pressure as well as motions and postures are monitored simultaneously, heart rate and electro-cardio morphological parameters are analyzed in various motion states, artery network model parameters and blood pressure parameters, particularly central arterial pressure wave form parameters, are analyzed, and the method and the equipment have great significance for prevention and control on cardiovascular diseases, particularly for prevention and control on high-risk diseases such as the hypertension, the coronary heart disease and the like.

Oscillometry or another method is employed to initially determine a mean blood pressure and a diastolic blood pressure. There is a similarity between an intra-arterial pressure waveform exactly representing blood pressure and a pulse wave form generated when a cuff occludes a site to be measured. This similarity is utilized to obtain blood pressure. More specifically, the cuff occludes a site to be measured, while a pulse wave is detected. From the detected pulse wave's maximum amplitude an estimated mean arterial pressure is obtained. The obtained estimated mean arterial pressure and the pulse wave's minimum value are regarded as a mean blood pressure and a diastolic blood pressure, respectively. From the pulse wave's maximum value a systolic blood pressure is obtained by an arithmetic operation.

The invention is suitable for the technical field of biological medicines and medical facilities, and provides a method and a device for measuring blood pressure upon radial artery pulse wave conduction time. The method comprises the following steps: acquiring a human body radial artery pulse wave signal through a photoelectric sensor, and performing filtering amplification and AD (analog-digital) conversion on the human body radial artery pulse wave signal through a microprocessor to finally obtain a human body radial artery pulse wave signal with low noise and obvious feature points; performing frequency-domain transformation, wavelet processing and second order difference on the obtained human body radial artery pulse wave signal to determine the feature points of a human body radial artery pulse wave form; calculating an accurate numerical value of the human body radial artery pulse wave conduction time; establishing a regression equation for measuring the blood pressure to finally obtain blood pressure values. According to the method and the device provided by the invention, the blood pressure only needs to be measured at a single point, so that the processing difficulty of the signal is reduced, a measuring process is simplified, and the comfort of blood pressure measurement is improved; meanwhile, the accuracy of blood pressure measurement is improved through method improvements, and moreover, the blood pressure can be continuously monitored for a long time.

The invention provides a pulse wave signal feature point detection method based on waveform time domain features. The mode that the interval of analyzing waveform is gradually decreased is adopted, the positions of feature points in pulse wave signals are determined by combining a differential algorithm with a wavelet transform algorithm on the basis of the waveform time domain features of the pulse wave signals in the analyzing process, therefore, unnecessary interference can be effectively removed, the signal features are amplified, the accuracy of pulse wave signal feature point detection is improved, and the recognition accuracy for the condition that tidal waves or dicrotic waves in pulse wave waveforms are not obvious is high. According to the pulse wave signal feature point detection method based on the waveform time domain features, detection of a computer on the pulse wave signal feature points is achieved, the workload of clinicians is reduced, the defect of manual detection errors is overcome, and a technological base is supplied to automatic calculation and acquisition of clinical pulse wave information by computer equipment and research and development of continuous non-invasive blood pressure detection equipment.

Circularly pulse-shaped waveforms for communication systems are disclosed herein including a single carrier modulation in which pulse-shaping is performed using a circular convolution by the transmitter for various modulation schemes. A transmitter, related method, and corresponding receiver are also disclosed for demodulation of the single carrier circularly pulse-shaped signal and data extraction.

The invention discloses a cardiovascular function detection method based on multi-channel pulse wave form analysis and a device thereof. A cardiovascular function evaluation index system suitable for health screening and personal dynamic detection is built by collecting blood pressure of upper limbs and lower limbs and multi-channel pulse wave form of neck, thigh, radio and ankle, and quality analysis and control can be conducted on evaluation index in the system. Simultaneously, the device is convenient to operate, low in cost and capable of well meeting requirements of large crowd for cardiovascular disease screening.

Pulse waves of a subject are detected in time sequence. Amplitude of the pulse waves is detected, and an interval between two pulse waves adjacent along a time axis is detected. A first change ratio of the interval along the time axis, and a second change ratio of the amplitude divided by the interval along the time axis are calculated respectively. By comparing the first change ratio and the second change ratio with a first threshold and a second threshold respectively, it is decided whether the pulse waves of the subject are irregular.

The present invention is blood pressure monitor detecting method and Korotkoff sound delaying and pulse wave conducting time signal generator. The detection method includes outputting several analog signals through digital synthesis on the computer stored data of respiration, cardioelectric, pulse wave and Korotkoff sound signals; setting computer controlled cuff pulse wave pressure generator, and determining the amplitudes and relations of the essential signals based on the relevant blood pressure detecting principle to form simulating human body signals essential for detecting blood pressure monitor and corresponding Korotkoff sound delaying and pulse wave conducting time signals; and feeding these signals to the blood pressure monitor to inspect the identity between the detection results of the blood pressure monitor and the set data of the signal generator.

The invention discloses a parameter-adjustable nuclear pulse simulation method. In search of a nuclear instrument and a nuclear signal processing method, in order to verify the reliability of hardware and the processing method, a larger number of diversified nuclear pulse signals are needed usually. The parameter-adjustable nuclear pulse simulation method disclosed by the invention comprises the following steps of: generating amplitude and adjacent pulse time interval value complying with distribution of selected any energy spectrum and time spectrum through sampling according to the selected any energy spectrum and time spectrum; selecting appropriate detector circuit parameters to establish a parameterized model; and designing an appropriate current pulse shape and taking the appropriate current pulse shape as an exciting signal of the model, generating continuous signals which have random amplitude and adjacent pulse time and comply with excepted energy spectrum and time spectrum distribution according to the parameters, the random amplitude and the adjacent pulse time interval value, and discretizing and superposing the continuous signals to obtain a voltage value, namely a digital pulse wave form, of each moment. The discrete sequential values are subjected to digital-to-analog conversion and used as input signals of a follow-up circuit, and therefore, vivid and diversified radiant signals are provided for amplification, formation, discrimination, accordance and other processing as well as data analysis of the follow-up circuit. The result shows that the parameter-adjustable nuclear pulse simulation method can be used for generating various wave forms of pulse signals conveniently and flexibly through a parameterized model and can meet the requirement on nuclear pulse diversification in the search of the nuclear instrument and the nuclear signal processing method.

An apparatus for detecting vital functions has a pulse wave sensor attachable to a body and a control unit. The control unit checks if amplitude of pulse wave signals produced from the pulse wave sensor varies. The control unit further checks if a large change in the amplitude during a systolic phase of a pulse wave corresponding to the systolic phase of the heart. If a first large change in the amplitude during a diastolic phase of a pulse wave corresponding to the diastolic phase of the heart, it is highly probable that a motion artifact has occurred. Therefore, a motion artifact flag is set. Next, it is checked if the amplitude in the next diastole is changing by more than 30%. if it is presumed that the occurrence of cough is highly probable, a cough flag is set. if it is neither the motion artifact nor the cough, then a yawn flag is set.

The invention relates to a noninvasive continuous blood pressure measuring method, comprising the following steps: acquiring a synchronizing signal of electrocardio and pulse waves of a subject; performing smoothing processing on the synchronizing signal of electrocardio and pulse waves of the subject, detecting an electrocardio signal R wave peak value point and characteristic points of the pulse waves and marking positions, calculating to obtain conducting time of the pulse wave and conduction ratio of corresponding pulse wave; and bringing the conducting time and conduction ratio of the pulse wave into an individualized blood pressure parameter model, and calculating to obtain continuous systolic pressure of the subject. A new parameter, that is conduction ratio, is introduced in the existing noninvasive blood pressure model, and an individualized parameter model is established for each subject, so as to obtain more accurate blood pressure results. The method is simple in operation, high in accuracy, and provides important basis for clinic blood pressure monitoring, home monitoring, and early warning, and monitoring of hypotensive drugs.

A pulse wave analyzing apparatus including a cuff 12 for detecting a pulse wave from a living subject, a pressure sensor 16 for converting the pulse wave detected by the cuff 12, into an electric signal, i.e., a pulse wave signal SM, a plurality of band-pass filters 62 (BPF(1), BPF(2), . . . , BPF(n)) that have respective low-side cuff-off frequency bands differing from each other and each receive the pulse wave signal SM, a provisional rising point determining device 64 for determining respective times PS of respective provisional rising points of respective pulse waves represented by respective secondary pulse wave signals SM2 that have passed through the band-pass filters 62, and a proper rising point determining device 66 for comparing the respective times PS of respective provisional rising points with each other and thereby determining a time AS of a proper rising point based on the respective times PS of respective provisional rising points.

A method for measuring interface traps in a MOSFET, comprising measuring charge pumping current of a pulse wave form for various frequencies over a predetermined frequency range, creating plotted points of the measured charge pumping current versus the predetermined frequency range, determining the total number of interface traps participating in the charge pumping current by calculating the slope of a best fit line through the plotted points.

The invention discloses a free light pulse generator based on optical Fourier transform, belonging to the optical fiber communication technical field, wherein the output of a pulse laser (1) of the generator is connected with one end of an optical fiber (5) via an optical filter (2) and a photoelectric phase modulator (4), the another end of the optical fiber (5) outputs needed waveform light pulse, the optical fiber (2) is composed of a circulator (3) and an optical fiber grating (6) or is composed of a Fabry-perot chamber filter or a waveguide filter to filter the frequency spectrum of the initial light pulse to attain a demanded frequency spectrum shape, the pulse laser and the photoelectric phase module are driven by one clock signal, to work synchronously. The invention filters light pulse, adjusts the frequency spectrum into a demanded pulse shape and uses optical Fourier transform to transform the frequency spectrum of the light pulse into time domain to attain the light pulse of a corresponding waveform. The invention overcomes the defect of the prior art as single waveform of light pulses.

A pulsed light communication device has a plurality of indicator light emitting diodes emitting diodes emitting at least one of a plurality of wavelengths of colored light to correspond to a designated color assigned to a security level for a network. A continuous uninterrupted modulated pulsed light emitting diode light signal may be generated having a sensitivity threshold detection level exceeding minimal parameters of a photodetector.

A circulatory function measurement device that accurately measures a subject's circulatory function. A pulse wave accumulated value calculation unit calculates a pulse wave accumulated value by accumulating the amplitude values of pulse waves in chorological order as the compressing pressure changes. A blood vessel hardness measurement unit measures blood vessel hardness based on the relationship between the calculated pulse wave accumulated value and the compressing pressure.

In order to provide an easy-to-use technique for measuring blood pressure and / or other vital signs of a subject, a sensor for detecting the passing of a pulse wave from a subject's arterial system is suggested, the sensor being adapted to be located at a sensing position on the exterior of the subject's body, characterized in that the sensor comprises a number of electrical coils for generating an inductive coupling to the subject's body in a way that the properties of said inductive coupling change if a pulse wave passes a screened volume underneath the sensing position, and a circuit connected to the number of electrical coils, said circuit being adapted to detect said property changes of the inductive coupling.

An etching processing method for etching a substrate formed with a target film and a mask film is performed in a substrate processing apparatus including a first and a second power supply for respectively supplying a higher and a lower high frequency power to a processing space and a mounting table, and a DC power supply for supplying a DC power to an electrode. The method includes a modification step for modifying a shape of a pattern formed on the mask film; and an etching step for etching the target film by using the mask film. The mask film is etched by the plasma in the modification step. Further, in the etching step, the DC power is applied to the electrode and the lower high frequency power is applied to the mounting table in a pulse wave form in which a higher and a lower power level are repeated.

The invention relates to a remote high-voltage pulse nanosecond switch applying insulating oil. The remote high-voltage pulse nanosecond switch comprises an organic glass shell, an electrode disk, a cathode, an anode, a triggering electrode, an electromagnet, a refined rapeseed oil serving as an insulating medium and a remote triggering and controlling system. The cathode, the anode and the electrode disk are tightly fixed together through bolts; the head of an electromagnet shell is provided with a thread and is connected with the organic glass shell of the switch; the tail end of an electromagnet core is connected with the triggering electrode through an organic glass rod; and the remote triggering and controlling system consists of a wireless remote controller, a receiving antenna, a high-frequency receiving module packaged in a metallic shield shell, a decoding integrated circuit (IC), a driving circuit, a relay and a storage battery. According to the remote high-voltage pulse nanosecond switch, radio signals emitted from the controller are received by the antenna, transmitted to the high-frequency receiving module and decoded by the decoding IC, the relay is driven by the driving circuit to energize the electromagnet and push the triggering electrode to move towards a main electrode, so that quick high voltage discharging is safely, reliably and conveniently realized, and a pulse wave form of which the rising edge is a nanosecond level is formed.

The invention discloses a calculation method for extracting a conduction time from a pulse wave, comprising the steps of: acquiring a pulse wave signal; carrying out quadratic differential and filtration on the obtained pulse wave signal; carrying out data splitting on the accelerated pulse wave after the quadratic differential through searching splitting feature points; searching C feature points in allusion to different data intervals after splitting; and calculating the conduction time by utilizing the searched feature points. According to the calculation method, the pulse wave signal is analyzed and processed, then a correct conduction time value can be searched and calculated and the changes of positions of the feature points can be correctly captured by using corresponding different algorithms when the positions of the feature points change under the influence of blood pressure values, so that the correctness and stability of the calculation of the conduction time are improved. The calculation method has the advantages of being correct, stable, simple, practical and the like.

The invention relates to the technical field of nonlinearity optical fiber optics, in particular to an alternately adjustable optical frequency comb based on phase modulation and optical fiber cavitysoliton and a generation method thereof. The optical frequency comb is composed of a narrow-linewidth tunable laser, a phase modulator, a variable-gain erbium-doped fiber amplifier, a narrow-band fiber filter, a polarization controller, a first optical fiber coupler, an optoisolator, a second optical fiber coupler, a main fiber, a variable optical attenuator, a first photoelectric detector, a laser frequency locking system, a second photoelectric detector, a high-speed oscilloscope, a data storage and processing system, a pulse-pattern generator and an electricity amplifier. The provided alternately adjustable optical frequency comb based on the phase modulation and the optical fiber cavity soliton and the generation method thereof have the advantages that only a common single mode fiber is needed to form an annular cavity, the generated optical frequency comb has low noise and high coherence, and is especially suitable for being used as a light source of a system very sensitive to phase noise such as a large-scale interference type optical sensing system.

A sensor array (19) having a plurality of pressure sensors arranged on a measurement surface, a pressurization portion (18) for pressing the sensor array laid across an artery of a living body, a sensor signal selection portion (20) for selecting a pressure signal among pressure signals from the plurality of pressure sensors, a filter portion (22) having a cutoff frequency variable corresponding to an instruction, and a filter control portion (11) for providing an instruction to vary a value of the cutoff frequency are included. The filter control portion switches the cutoff frequency in a situation wherein a plurality of pressure signals respectively obtained from the plurality of pressure sensors are successively switched and output by the sensor signal selection portion to specify the pressure sensor for pulse wave detection, and in a situation wherein the pulse wave is detected from the specified pressure sensor.

A pulse wave measuring apparatus is disclosed which is capable of measuring the pulse wave accurately in stable fashion and which can be reduced in size and integrated for an improved convenience. The pulse wave measuring apparatus comprises a sensor unit 20 having a plurality of semiconductor pressure sensors 6, a fixing stand 30 for fixing a living organism in position, a pressure cuff 1 for pressing the semiconductor pressure sensors 6 against the living organism, and a press operation control unit 16 for controlling the press operation of the pressure cuff 1. The press operation control unit 16 is arranged in the fixing stand 30.

A method and apparatus are disclosed for determining certain cardiac medical parameters that are useful is diagnosing and treating cardiovascular disease. The apparatus is designed to carry out the method, which includes the steps of:(a) inflating a blood pressure cuff on the brachial artery to a supra-systolic pressure;(b) sensing a sequence of pressure pulse waveforms associated with the brachial artery that result from a plurality of cardiac ejection cycles;(c) averaging the waveforms to produce an average, representative waveform having an initial, incident wave portion and a reflected wave portion;(d) analyzing the representative waveform to determine a value of one or more cardiac medical parameters including the reflection wave ratio (RWR), the reflected wave transit time (RWTT), the maximum amplitude of the initial pressure wave (PS1), the maximum rise (slope) of the initial pressure wave (dp / dt), and / or the systolic ejection period (SEP); and(e) displaying the value of the medical parameter(s).

The invention belongs to the technical field of arterial blood pressure measurement, and discloses a high-accuracy continuous non-invasive blood pressure measuring device with the self-adaptation calibration function. A photoelectric sensor is adopted for detecting pulse waves, reverse bias voltage is provided for a light receiving tube, the sensitivity and stability of the light receiving tube are enhanced, quite weak pulse wave signals can be detected, and the waveform quality of the detected signals can be improved; a broadband filter is adopted, and it is ensured that pulse wave shapes are distortionless; due to the technologies, correcting variables can be correctly extracted from pulse waves. The device recognizes propagation time PTT related to systolic pressure and diastolic pressure from pulse waves, and extracts various variables according to pulse wave form changes to recognize various anomalous changes of self-adaptation correction PTT in real time; on the basis of an existing mathematic model, blood pressure can be measured in a high-accuracy, continuous and noninvasive mode under the complex clinic condition, and calibration and repeated standardization can be achieved not depending on conventional methods such as cuff oscillography.

The invention discloses an LIN (local Internet) receiver circuit for providing immunity against ISO (interrupted source output) pulse. The receiver circuit comprises a filter circuit, a first comparator a driving device block; the filter circuit receives input signals and generates filtered signals; the first comparator compares the filtered signals and threshold voltage; the driving device block generates output signals of a receiver; the receiver circuit also comprises an input comparator, a signal regulating circuit and an amplitude limiting circuit; the input comparator detects the low voltage on the input signals, and the signal regulating circuit drives the filtered signals to the specific value so as to shorten the length of the short-time pulse wave form interference at the output part of the first comparator; meanwhile, the amplitude limiting circuit detects and removes the short-time pulse wave form interference so as to generate amplitude limiting device output signals; the amplitude limiting device output signals are received by the driving device block; and the driving device block outputs receiver output signals, wherein the receiver output signals do not contain short-time pulse wave form interference and the delay does not exceed 7.5mu s, thus the immunity against the ISO pulse is provided.

The invention discloses an arteriosclerosis degree determinator. The arteriosclerosis degree determinator comprises a cuff and a main machine, which are connected by a gas catheter, wherein one or two gas bags are arranged in the cuff; a controller and one or two sets of inflating / deflating and measuring components are arranged in the main machine; each set of inflating / deflating and measuring component comprises a pressure sensor, a gas pump and a vent valve; the controller is used for extracting one or more characteristics according to the pulse wave form obtained by the pressure sensor to determine the arteriosclerosis degree in a single or combined manner. The arteriosclerosis degree determinator has the technical effects that the arteriosclerosis degree determinator is convenient for users to carry out measurement independently and is used for determining the arteriosclerosis degree by adopting one or more brand-new characteristics based on the pulse wave form; inner and outer two gas bags are also designed to obtain the high-precision pulse wave form and the position relation, sizes, section shapes, and the like of the gas bags are optimally designed.