SENSOR AND CONTROL UNIT FOR FLOW CONTROL AND A METHOD FOR CONTROLLED DELIVERY OF FLUID
First Claim
1. A sensor (102) for measuring a velocity of a fluid (208) flowing through a channel (206), which sensor comprises a chip (104) and a sensor receiver (310), which chip comprises a heating element (106) for heating the fluid, and a transducer arrangement (108) for generating a measurement signal indicative for the velocity of the fluid flowing through the channel, which measurement signal is based on the ratio of a first spatial temperature difference and a second spatial temperature difference, and which sensor receiver is arranged for receiving an electromagnetic radiation for powering the heating element.
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Accused Products
Abstract
The invention relates to a sensor (102) and a control unit (702) for cooperation with the sensor. The sensor (102) serves for measuring a velocity of a fluid (308) flowing through a channel (306). The sensor (102) employs a thermal measuring principle, which measuring principle is robust regarding disturbances on the amount of power dissipated by the heating element (106). A sensor receiver (110) is arranged for receiving an electromagnetic radiation generated by a control transmitter (722) comprised in a control (702) unit for cooperation with the sensor (102). The electromagnetic radiation is employed for powering the heating element (106) which is arranged for heating the fluid. On the basis of a measurement signal generated by a transducer arrangement comprised in the sensor (102), a control actuator (724) controls the velocity of the fluid. For this purpose a sensor transmitter (116) is arranged for transmitting the measurement signal to a control receiver (734).
26 Citations
15 Claims
- 1. A sensor (102) for measuring a velocity of a fluid (208) flowing through a channel (206), which sensor comprises a chip (104) and a sensor receiver (310), which chip comprises a heating element (106) for heating the fluid, and a transducer arrangement (108) for generating a measurement signal indicative for the velocity of the fluid flowing through the channel, which measurement signal is based on the ratio of a first spatial temperature difference and a second spatial temperature difference, and which sensor receiver is arranged for receiving an electromagnetic radiation for powering the heating element.
- 8. A control unit (602) for cooperation with a sensor (102) for measuring a velocity of a fluid (208) flowing through a channel (206), which sensor comprises a chip (104) and a sensor receiver (310), which chip comprises a heating element (106) for heating the fluid, and a transducer arrangement (108) for generating a measurement signal indicative for the velocity of the fluid flowing through the channel, which measurement signal is based on the ratio of a first spatial temperature difference and a second spatial temperature difference, and which sensor receiver is arranged for receiving an electromagnetic radiation for powering the heating element, wherein the control unit comprises a control transmitter (626) for transmitting the electromagnetic radiation to the sensor receiver.
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15. A method for controlled delivery of a liquid medication, comprising:
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a step (802) of establishing a predefined fluid flow velocity, a step (804) of detachably connecting a control unit to a channel, the control unit cooperating with a sensor, the sensor, measuring a velocity of a fluid (208) flowing through the channel (206), and comprising a chip (104) and a sensor receiver (310), which chip (104) further comprises a heating element (106) for heating the fluid, and a transducer arrangement (108) for generating a measurement signal indicative for the velocity of the fluid flowing through the channel based on a ratio of spatial temperature differences, the sensor receiver being arranged for receiving an electromagnetic radiation for powering the heating element, the sensor receiver being an antenna (110), in which the heating element is integrated; a step (806) of controlled delivery of the liquid medication through the channel by application of the sensor and an actuator controlling the flow velocity of the fluid flowing through the channel.
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Specification