APPARATUS AND METHOD FOR MEASURING AIR FLOW
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Abstract
An apparatus and method for measuring air flow in a duct, e.g. in a ventilation duct, includes a sensor fittable into connection with the duct, the sensor including an ultrasound transmitter and at least two ultrasound receivers, and a control unit to which the ultrasound transmitter and ultrasound receivers are connectable. The control unit is adapted to measure, during the measuring of air flow, the phase difference of an ultrasound signal received at the same moment in time by at least two ultrasound receivers fitted into connection with the duct and, based on the measured phase difference, to determine the flow velocity and/or flow direction of the air. The apparatus is adapted to perform a calibration of the apparatus by transmitting with an ultrasound transmitter at least one calibration signal and by receiving the calibration signal with at least two ultrasound receivers. The apparatus is further adapted to analyze the received calibration signal and based on the analysis to select the parameters to be used in measuring to be such that at least one analysis result of the calibration signal meets predetermined criteria with the parameters.
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Citations
54 Claims
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1-28. -28. (canceled)
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29. An apparatus for measuring air flow in a duct, wherein the apparatus comprises:
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a sensor fittable into connection with the duct, the sensor comprising an ultrasound transmitter and at least two ultrasound receivers; and a control unit to which the ultrasound transmitter and ultrasound receivers are connectable, wherein the control unit is adapted to measure, during the measuring of air flow, the phase difference of an ultrasound signal received at the same moment in time by at least two ultrasound receivers fitted into connection with the duct and, based on the measured phase difference, to determine the flow velocity and/or flow direction of the air, wherein the apparatus is adapted to perform a calibration of the apparatus by transmitting with an ultrasound transmitter at least one calibration signal and by receiving the calibration signal with at least two ultrasound receivers, wherein the apparatus is further adapted to analyze the received calibration signal and, based on the analysis, to select the parameters to be used in measuring to be such that at least one analysis result of the calibration signal meets predetermined criteria with the parameters, and wherein the apparatus further comprises means, arranged in connection with the duct, for measuring distance, and the apparatus is adapted to measure the size of the duct with the means for measuring distance. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A method for measuring air flow in a duct with an apparatus, wherein the apparatus comprises:
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a sensor fittable into connection with the duct, the sensor comprising an ultrasound transmitter and at least two ultrasound receivers; and a control unit to which the ultrasound transmitter and ultrasound receivers are connectable, wherein the control unit measures, during the measuring of air flow, the phase difference of an ultrasound signal received at the same moment in time by at least two ultrasound receivers fitted into connection with the duct and, based on the measured phase difference, determines the flow velocity and/or flow direction of the air, wherein the apparatus performs a calibration of the apparatus by transmitting with an ultrasound transmitter at least one calibration signal and by receiving the calibration signal with at least two ultrasound receivers, wherein the apparatus analyzes the received calibration signal and based on the analysis selects the parameters to be used in measuring to be such that at least one analysis result of the calibration signal meets predetermined criteria with the parameters, and wherein the apparatus further comprises means, arranged in connection with the duct, for measuring distance, and the apparatus measures the size of the duct with the means for measuring distance. - View Dependent Claims (43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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Specification