1898 results about "Pulsed wave" patented technology

The present invention relates to a diagnosis apparatus for analyzing arterial pulse waves comprising a database 26 in which is stored data showing the relationship between data representing a pulse wave of a living body and teaching data representing conditions of the living body; and a micro-computer 21 for outputting teaching data corresponding to the pulse wave detected from the living body in the teaching data on the basis of the pulse wave detected from the living body and the stored data inside database 26. As a result, it becomes possible to perform diagnoses equivalent to a skilled doctor.

A pressure gauge for determining at least one pressure value describing a pressure of a fluid flowing in a pulsating manner in a phase of the pulsating flow, includes a pulse wave characterizer. The pulse wave characterizer is configured to obtain transmit time information of a pulse wave, and amplitude information of the pulse wave. The pressure gauge additionally includes a pressure value determiner configured to obtain a first pressure value describing a pressure of the fluid in a first phase, on the basis of the transmit time information and while using a mapping. The pressure value determiner is further configured to obtain a second pressure value describing a pressure of the fluid in a second phase, on the basis of the first pressure value and the amplitude information while using a mapping.

The present invention realizes calculating a pulse rate accurately, even when a body movement component has no periodical characteristics, by surely removing the body movement component generated in a living organism from a pulse wave component. A pulse wave detecting section includes a pulse wave sensor and outputs a pulse wave detection signal to an MPU functioning as a body motion component removing section. A body motion sensor outputs a body motion detection signal corresponding to a body motion that affects the behavior of venous blood to the MPU. As a result, to the MPU removes the body motion component from the pulse wave detection signal based on the body motion detection signal. A pulse rate calculating section calculates the pulse rate based on the pulse wave detection signal from which the body motion component has been removed. The pulse rate is displayed on a liquid crystal display device.

A method for measurement of a distance to a surface of a product kept in a tank method comprises transmitting a pulse train of distinct carrier wave pulses having a duration greater than 1 microsecond and shorter than 100 milliseconds, the pulse train has an average duty cycle of less than 50 percent, each pulse has a defined center frequency, selected according to a frequency scheme within a predetermined frequency range, greater than 5% of an average center frequency. The method further comprises correlating actual phase properties of received pulses with expected phase properties to provide an updated estimation of the distance.The present invention is based on transmitting a set of carrier wave pulses, each having a distinct frequency selected within a frequency range. The method is therefore referred to as a Frequency Modulated Pulsed Wave (FMPW).

The invention discloses a measuring method and device for measuring the particle granularity, consistency and density, which relates to the technical field of ultrasonic measurement. The invention aims at solving the technical problem of increasing the commonality and the precision of the ultrasonic measurement. The measuring device includes a computer, a signal process circuit, a pulse wave launch / receive circuit and a broadband transducer, which are orderly connected together; the broadband transducer is arranged at the external side of a baffle plate. The process procedures of the computer are as follows: ultrasonic amplitude phase spectrum is obtained after the rapid Fourier transformation of the signal, and then the phase spectrum is converted to obtain a reflection coefficient, the acoustic characteristic impedance, the acoustic attenuation coefficient and the sound velocity; the compound density can be calculated by the measuring value, and the consistency can be calculated through the known particle and the density of the continuous medium; the frequency analysis of the direct reflection wave and the transmission echo is carried out to obtain difference between the acoustic attenuation spectrum and the theoretical acoustic attenuation spectrum, and the difference is then regarded as the objective function, and then is optimized with optimization method to calculate the distribution of the particle granularity. The invention has the advantages of measuring and analysis basing on the reflecting ultrasonic, great commonality and precise measuring result.

A photoplethysmogram (PPG) signal may be obtained from a pulse oximeter, which employs a light emitter and a light sensor to measure the perfusion of blood to the skin of a user. However, the signal may be compromised by noise due to motion artifacts. That is, movement of the body of a user may cause the skin and vasculature to expand and contract, introducing noise to the signal. To address the presence of motion artifacts, examples of the present disclosure can receive light information from two light sensors situated in a line parallel to the direction of the blood pulse wave. The light information from each sensor may include the same noise signal, and thus subtracting one from the other can result in a heart rate signal where the noise has been canceled out. In some examples, a signal from one of the light sensors may be multiplied by a scaling factor before cancellation to account for response differences in each light sensor.

[Object] To stably generate plasma at atmospheric pressure.[Solving Means] There are provided a tubular casing 10 into which a gas and a microwave are introduced, a hole 30 provided in a bottom surface of this casing, and a columnar conductor 40 which is provided in an axis direction of the casing, a bottom surface of the conductor 40 having a contour placed inside the contour of the hole. A minute gap A formed between the contour of a bottom surface 41 of the conductor 40 and the contour of the hole, a coaxial waveguide formed of the conductor and the casing, and an insulating film 22 formed at least on a contour portion forming the hole at the minute gap are provided. In the structure described above, the microwave is guided to the minute gap by the coaxial waveguide, and the gas is made to pass through the minute gap, so that the gas is placed in a plasma state at the minute gap. The microwave is a pulse wave and is duty-controlled, and the contour portion forming the hole 30 is cooled with a cooling medium from the inside of an electrode 20. Accordingly, the increase in plasma temperature can be prevented, and as a result, stable plasma can be generated.

The invention relates to a real-time blood pressure measuring device. The real-time blood pressure measuring device comprises a first pulse wave sensing module, a second pulse wave sensing module and a signal processing module. The first pulse wave sensing module is used for obtaining a first pulse wave signal of every heartbeat cycle; the second pulse wave sensing module is used for obtaining a second pulse wave signal of every heartbeat cycle; the pulse waves obtained by the first pulse wave sensing module and the second pulse wave sensing module are different in types; the signal processing module is used for obtaining the same artery position, meanwhile, obtaining the transmission time difference between the first pulse wave signal and the second pulse wave signal and obtaining the artery blood pressure of every heartbeat cycle according to the transmission time difference.

An ultrasonograph capable of generating a transmission beam comprising a main beam having a uniform width over a wide range in an ultrasonic wave propagation direction by one-time transmission of an ultrasonic pulse. A weighted mean value of a plurality of transmission delay time values corresponding to focal lengths of transmission pulse waves having a plurality of focal points which are set in the ultrasonic wave propagation direction is calculated for each of elements constituting a transmission aperture and used as the delay time. The curvature of a transmitted wave front is close to a short focal length in the center portion of the transmit aperture and is close to a long focal length in the peripheral portion. Thus, a transmission beam including a relatively narrow main beam with a uniform width over a wide range in the ultrasonic wave propagation direction can be generated.