Abstract: A system for detecting blood velocity within a blood vessel includes a piezoelectric transducer supported on a ceramic substrate. The ceramic substrate supports the piezoelectric transducer at a fixed angle of incidence that is greater than 0° and less than 90°. The ceramic substrate is formed of steatite ceramic and is configured to couple an ultrasonic signal emitted by the transducer to skin underlying the substrate.

Abstract: A system for detecting blood velocity within a blood vessel includes a piezoelectric transducer supported on a ceramic substrate. The ceramic substrate supports the piezoelectric transducer at a fixed angle of incidence that is greater than 0° and less than 90°. The ceramic substrate is formed of steatite ceramic and is configured to couple an ultrasonic signal emitted by the transducer to skin underlying the substrate.

Abstract: A system for detecting blood velocity within a blood vessel includes a transducer array including a plurality of transducers. Each of the transducers includes a carrier substrate, at least one spacer extending upwardly from the substrate, a transducer element attached to the spacer such that the piezoelectric transducer is spaced apart from the substrate, and setting electrodes positioned on the upper surface of the substrate under the piezoelectric transducer. The system also includes a tilt control system that is configured to apply a bias voltage to the setting electrodes which causes the transducer element to pivot about a pivot axis between a first tilted position and a second tilted position.

Abstract: A system for detecting blood velocity within a blood vessel includes a piezoelectric transducer supported on a ceramic substrate. The ceramic substrate supports the piezoelectric transducer at a fixed angle of incidence that is greater than 0° and less than 90°. The ceramic substrate is formed of steatite ceramic and is configured to couple an ultrasonic signal emitted by the transducer to skin underlying the substrate.

Abstract: A system includes at least one piezoelectric transducer array having a plurality of piezoelectric transducer elements. The transducer array is configured to be placed on an area of skin. A phase control system is configured to generate a first electrical actuation signal for actuating the transducer elements to emit first ultrasonic signals, the first electrical actuation signal being phase shifted for each of the transducer elements. A multi-input multi-output (MIMO) control system is configured to generate a second electrical actuation signal for actuating the transducer elements to emit second ultrasonic signals, the second electrical actuation signal being different for each of the transducer elements. A switching device is configured to switchably connect the phase control system and the MIMO control system to the phased transducer array.

Abstract: A system for detecting artery location to measure blood velocity includes a first piezoelectric transducer array including a plurality of transducer elements, each of the transducer elements being supported on a first ceramic substrate, the first ceramic substrate having a planar lower surface configured to be placed on a surface of an area of skin of a user, the first ceramic substrate being configured to couple an ultrasonic signal emitted by the transducer elements to the skin. A phase control system is configured to supply each of the transducer elements with an electrical actuation signal, the electrical actuation signal being phase shifted for each of the transducer elements. The phase control system is configured to phase shift the electrical actuation signal supplied to the transducer elements such that an ultrasonic beam is formed and to steer the ultrasonic beam toward a blood vessel located beneath the area of skin.

Abstract: A system for detecting blood velocity within a blood vessel includes a transducer array including a plurality of transducers. Each of the transducers includes a carrier substrate; at least one spacer extending upwardly from substrate, a transducer element attached to spacer such that the piezoelectric transducer is spaced apart from the substrate, and setting electrodes positioned on the upper surface of the substrate under the piezoelectric transducer. A tilt control system is configured to apply a bias voltage to the setting electrodes which causes the transducer element to pivot about a pivot axis between a first tilted position and a second tilted position.