42results about How to "Continuous and precise measurement" patented technology

The present invention provides an apparatus and methods for continuous intravascular measurement of whole blood concentration, blood pressure, and pulse pressure. The intravascular catheter incorporates a sensor to measure whole blood sound velocity, attenuation, backscatter amplitude, and blood flow velocity and also incorporates existing technologies for multiple physiologic measurements of whole blood. Pulse wave velocity and wave intensity are derived mathematically for purposes of estimating degree of local vascular tone.

The invention provides a system for measuring blood pressure from a patient that includes: 1) an optical module configured to be worn on the patient's ear and comprising at least one optical source and a photodetector; 2) a calibration source configured to make a blood pressure measurement; and, 3) a processing module configured to: i) receive a first signal from the optical module; ii) receive a second signal from the calibration source; iii) process the first and second signals to generate a calibration table; and iv) receive a third signal from the optical module and compare it to the calibration table to determine the patient's blood pressure.

The present invention provides an apparatus and methods for continuous intravascular measurement of whole blood concentration, blood pressure, and pulse pressure. The intravascular catheter incorporates a sensor to measure whole blood sound velocity, attenuation, backscatter amplitude, and blood flow velocity and also incorporates existing technologies for multiple physiologic measurements of whole blood. Pulse wave velocity and wave intensity are derived mathematically for purposes of estimating degree of local vascular tone.

An online multi-phase flow meter for continuously and accurately measuring the volumetric quantities of gas, oil, and water flowing concurrently in a conventional feed pipeline, such as an oil well pipeline or a transport pipeline. The online multi-phase flow meter includes: an inlet pipe; an exit pipe; a cylindrical gas separation unit that is connected to the inlet pipe; a gas measuring system; an oil and water measuring system; a slurry collection system; a maintenance system; an electronic controller and solenoid valve for maintaining a minimum liquid level in the cylindrical gas separation unit; and a data acquisition system comprising a microprocessor. Also, a method for continuously and accurately measuring the volumetric quantities of a multi-phase mixture containing gas, oil, and water with the online multi-phase flow meter.

A laser machining system, or laser welding system, for machining a workpiece includes: a laser machining head for directing a laser beam onto a workpiece to produce a vapor capillary; an optical measuring device using an optical measuring beam; an image acquisition unit to capture an image of a region of the workpiece surface containing the vapor capillary and a measuring spot produced by irradiation with the measuring beam. The system determines positions of the measuring spot and vapor capillary based on the image. A method includes: directing the laser beam onto a workpiece surface to produce a vapor capillary; directing an optical measuring beam onto the surface to measure a depth of the vapor capillary; capturing an image of a region containing the vapor capillary and a measuring spot from the optical measuring beam; and determining, based on the captured image, position of the measuring spot and vapor capillary.

The invention relates to a self-recording instrument for the evaporation capacity of a sandy land, which can be used for fixedly monitoring the ground evaporation capacity in a natural environment and automatically recording ecological environment factors in real time. The self-recording instrument comprises an evaporation pan system, a capillary connecting device, a water level controlling and water supplying device, a soil moisture monitoring and electronic program controlling system, a data recording, storing and displaying system, a seepage discharging and receiving system and a housing, wherein the evaporation pan system and the water level controlling and water supplying device are connected with the capillary connecting device; the soil moisture monitoring and electronic program controlling system comprises a moisture monitoring electronic program controller, a pressure sensor, two thermistors and two temperature sensors, wherein the electronic program controller is connected with the pressure sensor, the thermistors and the temperature sensors, and the pressure sensor is arranged at the water level controlling and water supplying device; and the evaporation pan system, thecapillary connecting device and the water level controlling and water supplying device are arranged at the housing. The self-recording instrument is suitable for an all-weather and long-term located monitoring in the open, can be used for continuously and accurately measuring the ground evaporation capacity, and is especially suitable for the sandy land.