63results about How to "Accurate and Precise Measurements" patented technology

The present invention provides a medical device for measuring and / or providing cervical dilation including an elongate body defining a proximal end and a distal end, as well as an expandable element coupled to the distal end of the elongate body. An array of movable elements may be disposed circumferentially about the elongate body, where the array of movable elements is movably coupled to the distal end of the elongate body by a plurality of wires. The medical device may further include a measurement mechanism able to determine a radial spacing of the array of movable elements, as well as a dilation indicator in communication with the measurement mechanism. One or more pressure sensors may be coupled to the array of movable elements, whereby a control element is in communication with the pressure sensors. In addition, an inflation source may be included in fluid communication with the expandable element.

The present invention provides a medical device for measuring cervical dilation, where the medical device is positionable about a hand having first and second fingers, with each finger having a tip and a side surface. The medical device may include a housing, a first extension element movably coupled to the housing, a second extension element movably coupled to the housing, and a dilation indication mechanism to measure a distance between the first and second extension elements. The medical device may also include a first lateral pressure sensor positionable about a side surface of the first finger, a second lateral pressure sensor positionable about a side surface of the second finger, a third pressure sensor positionable about a tip of the first finger, and a fourth pressure sensor positionable about a tip of the second finger.

A device for the precise and accurate potentiometric pH measurements in situ. Embodiments of a potentiometric device according to the invention consist of one or more glass pH-sensitive electrodes connected to a potentiometer. A key feature of the device is that, rather than being calibrated conventionally with buffers, it can be calibrated with an in situ device that measures pH spectrophotometrically. Spectrophotometric pH measurements obtained via sulfonephthalein absorbance measurements are inherently calibrated (do not require buffers). Thus, devices according to the invention allow for continuous potentiometric pH measurements with occasional spectrophotometric calibrations. The spectrophotometric calibration device consists of a spectrophotometer with associated pumps for combining a sulfonephthalein pH indicator with the aqueous medium whose pH is to be measured. The device will record potentiometric pH measurements for an extended period of time until the spectrophotometric device is autonomously activated for another calibration. In this manner precise and accurate pH measurements can be obtained continuously in the environment, and the low energy expenditure of the potentiometric device provides excellent endurance. Also provided is a method and associated devices for spectrophotometrically determining the salinity of an aqueous medium.

An apparatus for improving the procedure for quantifying the volume of liquid dispensed by a liquid-dispensing mechanism of an analytical instrument. The apparatus of this invention comprises (a) at least one weigh cup; (b) at least one standard mass; (c) at least one transducer assembly to convert a value of weight to an electrical response; and (d) at least one electronic circuit for converting the electrical response to a measurement of volume. This invention provides a method for calibrating readings of the volume of liquid dispensed by a liquid-dispensing mechanism of an analytical instruments so that absolute measurements of the volume of liquid dispensed can be obtained.

Disclosed is an apparatus for measuring a fluorescence lifetime. The apparatus for measuring the fluorescence lifetime comprises an excitation light generator that generates excitation light to be irradiated on a sample including fluorescence molecules; a fluorescence photon collecting unit that collects a plurality of fluorescence photons generated by irradiating the excitation light on the sample; a light sensor that converts the collected fluorescence photons into a fluorescence electrical signal; and a fluorescence lifetime signal processor that determines the fluorescence lifetime by calculating the average time of the fluorescence electrical signal with respect to a predetermined apparatus delay time. According to the above configuration, the present invention can accurately and precisely measure a fluorescence lifetime in a short measurement time by easy calculation.

A meter for reproducibly and accurately measuring the delivery or flow rate of known fluids in chromatography and other pressure driven pumping systems, comprising a sense tube of known effective radius and length, coupled to a temperature measuring device, and enclosed in such a way as to allow the temperature of the tube and fluid to be measured, and optionally regulated. The invention is also useful for determining the viscosity of an unknown fluid or combination of fluids.

An apparatus for measuring plasma electron density precisely measures electron density in plasma even under a low electron density condition or high pressure condition. This plasma electron density measuring apparatus includes a vector network analyzer in a measuring unit, which measures a complex reflection coefficient and determines a frequency characteristic of an imaginary part of the coefficient. A resonance frequency at a point where the imaginary part of the complex reflection coefficient is zero-crossed is read and the electron density is calculated based on the resonance frequency by a measurement control unit.

A motion system includes a first stage that is configured to rotate about a first axis and a second stage coupled to the first stage that includes an object carrier adapted to position an object in at least one other axis. The motion system has a novel arrangement of laser interferometer elements and axes of motion. The arrangement permits accurate and precise measurement of a position of the object carrier in up to three (or more) axes of motion even as the first stage of the motion system is tilted through relatively large angles. The novel arrangement of the axes of motion also enables very precise control of the position of the object carrier even at high tilt angles.