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Applicant: KARLSRUHE FORSCHZENT (DE)Patent Number: DE10141097Publication date: 13 March 2003Title: Sensor for measuring low flow rates has housing divided into regions separated by membrane, fluidic feed(s) ending in each region, membrane position and/or movement sensor(s)
The flow measurement device has a measurement volume enclosed by a two-part housing in which at least two fluidic feeds are arranged. The housing is divided into at least two regions separated from each other by a membrane attached to the housing, whereby at least one fluidic feed ends in each region. At least one sensor is provided that can determine the position and/or movement of the membrane. An independent claim is also included for the following: a method of measuring low flow rates.
Applicant: DRAEGER MEDIZINTECH GMBH (DE)Patent number: US6742399Publication date: 1 June 2004Title: Respiratory flow sensor with flow channel having a measuring transducer and air resistance body
A respiratory flow sensor, which is suitable for use near a patient, covers a broad gas volume flow measuring range with a low breathing flow resistance and good, reproducible measured signal quality at the same time. The respiratory flow sensor has a first air resistance body with a blunt end and with an opposite pointed end. The air resistance body is arranged between the measuring transducer, of which there is at least one, and the patient-side end of the respiratory flow sensor. The pointed end of the first air resistance body points toward the measuring transducer. A second air resistance body with a pointed end is arranged between the measuring transducer, of which there is at least one, and the end of the respiratory flow sensor that is away from the patient. The pointed end of the second air resistance body also points toward the measuring transducer.
Applicant: SU MING (US); DRAVID VINAYAK P (US)Patent number: US2004194535Publication date: 7 October 2004Title: Nanodisk sensor and sensor array
The invention provides a sensor array with different nanodisk sensors that may be fabricated by direct site- specific dip-pen nanopatterning (DPN) using precursor inks. The good flow characteristics and strong affinity of the sols to measurement electrodes enable intimate ohmic contact. The measurable, reproducible and proportionate changes in the resistance of the sensors when exposed to trace quantities of oxidative and reducing gases constitute the basis for nanodisk gas sensors. The nanodisk sensors show rapid response and ultra-fast recovery for the detection of nitrogen dioxide and acetic acid vapour. Based on the principles of pattern recognition of the olfactory system, an electronic nose that can “smell” different gaseous species is provided with the multiple nanodisk sensor array. These nanodisk sensors have gas recognition ability, instant response and rapid recovery, compact size and integration with the established microelectronics platform and are well- suited for the on-site and real-time detection of gases.
Applicant: ABBOTT LAB (US)Patent Number: US6801041Publication date: 5 October 2004Title: Sensor having electrode for determining the rate of flow of a fluid
Sensors that are capable measuring the rate of flow of a fluid that passes over the electrodes of the sensor. In these sensors, an electrode, designated the flow rate-determining electrode, is used in conjunction with the conventional electrodes, e.g., the working electrode, the reference electrode, and the counter electrode, to determine the rate of flow of the fluid. In one aspect, this invention provides a sensor for measuring the concentration of an analyte in a sample of fluid when the sample flows continuously over the electrodes of the sensor, especially when the rate of flow of the sample is relatively low. In another aspect, this invention provides a method for measuring the concentration of an analyte in a sample of fluid, wherein the rate of flow of the sample varies during the period of time, that the sensor is in place. In a preferred embodiment, the sensor employs four electrodes, namely, a working electrode, a reference electrode, a counter electrode, and a flow rate-determining electrode. Alternatively, a single electrode that performs both the function of the reference electrode and the function of the counter electrode can replace the reference electrode and the counter electrode. In addition, a dummy electrode or a blank electrode can be used to compensate for interference from electrochemically active species. The reagent(s) specific to the analyte of interest is required to be deposited on the working electrode.