21results about "Electrothermic-effect transistor" patented technology

A MEMS transducer for interacting with a volumetric flow of fluid comprises a substrate having a cavity; and an electromechanical transducer connected to the substrate within the cavity, which has an element deformable along a lateral direction of motion, wherein deformation of the deformable element in-plane along the lateral direction of motion and the volumetric flow of the fluid are causally related. The cavity has an opening in the substrate, wherein a valve structure is arranged in a region of the opening, configured to reduce the flow of the volumetric flow through the opening in at least one direction out of and / or into the cavity.

An apparatus, comprising a film (103) comprising a network of conductive and / or semi-conductive high aspect ratio molecular structures is presented. The apparatus also comprises a frame (102) arranged to support the film (103) at least at least two support positions so that a free-standing region (101) of the film (103) extends between the at least two support positions. The two or more electrical contact areas electrically coupled to the film (103), and these electrical contact areas are arranged to pass electric charge across the free- standing region (101) of the film (103) at a current between 0.01 and 10 amperes.

A method and apparatus for maintaining a free-standing region of a film including a network of High Aspect Ratio Molecular structures (HARM-structures). The method includes electrically coupling the film to two or more electrodes at two or more peripheral locations of the film and passing electric charge across the free-standing region of the film to create a magnetic attraction between the HARM-structures in the network.

A thermoacoustic heat distribution system (100) is provided. The system includes a base (102) comprising a first surface (104) and a second opposite surface (106), a mounting structure (114C, 114D) for holding the base (102) to a supporting surface (116), a heating medium (108) applied on the base (102), an electrically conductive structure (110) arranged with the base (102), a power supply unit (112) and a magnet unit (118). The power supply unit (112) is configured to increase the temperature of the heating medium (108) and to circulate a pulsating electric current through the electrically conductive structure (110). The magnet unit (118) is configured to generate a magnetic field which interacts with the pulsating electric current, causing the base (102) to vibrate.

An underwater sound generation device may be used for effective control of algae and other microorganisms in ponds and lakes. The sound projector may comprise a thermoacoustic sound transducer and an electronic unit for controlling the operation of the projector. The thermoacoustic projector may include a freestanding carbon nanotube (CNT) film encapsulated between two vibrating plates. The inert gas filled thin acoustical cavity provides a piston-type displacement of the plates and supports a high-temperature operation. A power supply driver, controlling the operation of the sound radiating system, may include a pulse generator, high-power switch amplifier, and a cable, connecting the projector with an electronic driver. The sound control system may provide an omnidirectional sound pressure level in a wide frequency range to affect the algae growth ecosystem over large distances.

This pressure wave generating element comprises a support body 10 and a fiber layer 20 that is provided upon the support body 10 and that generates heat from the application of electric current. The fiber layer 20 includes fibers having a metal coating at least partially provided to the surfaces thereof. The fiber layer 20 is formed from a fiber film having an average pore size in the range of 0.1-1.0 μm. As a result of this configuration, a pressure wave generating element having improved sound pressure and suitable electrical resistance is obtained.

An apparatus, comprising a film (103) comprising a network of conductive and / or semi-conductive high aspect ratio molecular structures is presented. The apparatus also comprises a frame (102) arranged to support the film (103) at least at least two support positions so that a free-standing region (101) of the film (103) extends between the at least two support positions. The two or more electrical contact areas electrically coupled to the film (103), and these electrical contact areas are arranged to pass electric charge across the free-standing region (101) of the film (103) at a current between 0.01 and 10 amperes.

A transducer comprising a primary element comprising a magnet configured to provide a magnetic field within a magnetic zone, the magnetic field extending in a magnetic field direction; a secondary element comprising a first graphene sheet located within the magnetic zone; a static portion; and a rotating portion configured to rotate about an axis of rotation relative to the static portion. The rotating portion comprises a first one of a set comprising the primary element and the secondary element; and wherein the static portion comprises a second one of the set; and wherein an axis of rotation of the rotating portion is such that: in a first position of the static portion relative to the rotating portion, the first graphene sheet lies in a first plane that is parallel to the magnetic field direction; and in a second position of the static portion relative to the rotating portion, the first graphene sheet lies in an offset plane that is at an angle to the first plane about the axis of rotation. On deployment of the transducer in a first mode, movement of the rotating portion relative to the static portion causes an electrical potential to be generated in the first graphene sheet thereby converting rotational kinetic energy into electrical potential; and / or on deployment of the transducer in a second mode, electrical potential in the first graphene sheet causes rotation of the rotating portion relative to the static portion thereby converting electrical potential into rotational kinetic energy.

An underwater sound generation device may be used for effective control of algae and other microorganisms. The sound projector may comprise a thermoacoustic sound transducer and an electronic unit for controlling the operation of the projector. In at least one embodiment, the thermoacoustic projector includes a freestanding carbon nanotube (CNT) film encapsulated between two vibrating plates. The gas filled thin acoustical cavity provides a piston-type displacement of the plates and supports a high-temperature operation. A power supply driver, controlling the operation of the sound radiating system, may include a pulse generator, high-power switch amplifier, and a cable, connecting the projector with an electronic driver. The sound control system may provide an omnidirectional sound pressure level in a wide frequency range to affect the algae growth ecosystem over large distances.

Provided is a thermal-excitation-type pressure-wave-generating element with which it is possible to generate higher sound pressure. A pressure-wave-generating element according to the present invention is a thermal-excitation-type element and comprises a first solid insulating layer that has a first principal surface, a first metal layer that is provided to the first principal surface of the first solid insulating layer, a second metal layer that is disposed so as to be spaced apart from the first metal layer by a distance in the thickness direction of the first solid insulating layer, a first electrode that is electrically connected to one end of the first metal layer and to one end of the second metal layer, and a second electrode that is electrically connected to the other end of the first metal layer and to the other end of the second metal layer, the first solid insulating layer being positioned between the first and second metal layers.

A pressure wave generating element that includes a support and a fiber layer on the support and constructed to generate heat by energization. The fiber layer is in the form of a fiber membrane having an average pore diameter in a range of 0.1 to 1.0 μm, and the fiber layer includes one or more fibers having a surface at least partly provided with a metal coating.

A MEMS transducer for interacting with a volume flow of fluid comprises a substrate having a cavity; and an electromechanical transducer connected to the substrate within the cavity, the transducer having a deformable element along a lateral direction of motion, wherein deformation of the deformable element in-plane along the lateral direction of motion and the volume flow of the fluid are causally related. The substrate has a substrate spring element adjacent to a region where the electromechanical transducer is connected to the substrate.

A MEMS transducer for interacting with a volume flow of fluid comprises a substrate having a cavity; and an electromechanical transducer connected to the substrate within the cavity, the transducer having a deformable element along a lateral direction of motion, wherein deformation of the deformable element in-plane along the lateral direction of motion and the volume flow of the fluid are causally related. The electromechanical transducer is connected to the substrate by force-fit or form-fit, or is integrally formed with the substrate.

An apparatus, method and computer program is described including: a driver for driving a membrane of a gas-retaining chamber to induce vibrations in the membrane in a first mode of operation, wherein said membrane is configured to surround at least part of a device; and an activator for activating a rapid expander in a second mode of operation, wherein the expander comprises an expandable foam that is configured to inflate said chamber in response to an activation signal.

An apparatus, method and computer program is described comprising: means for driving a membrane of a gas-retaining chamber (32a) to induce vibrations in the membrane in a first mode of operation, wherein said membrane is configured to surround at least part of a device (30a, 30b); and means for activating a rapid expansion mechanism in a second mode of operation, wherein the expansion mechanism comprises an expandable foam that is configured to inflate said chamber (32b) in response to an activation signal.

A pressure wave generating element that includes a support; a fiber layer on the support, the fiber layer containing a fiber having a surface thereof at least partially coated with a metal coating, and the fiber in the fiber layer being oriented in a predetermined direction; and a pair of electrodes arranged so as to apply a voltage in an orientation direction of the fiber of the fiber layer.

The acoustic device 10 for generating sound comprises a housing 12 containing a diaphragm 18 coupled to the housing. The diaphragm 18 is driven to generate acoustic waves by an actuator assembly to mo

There is disclosed a thermoacoustic system (100). The system (100) comprises a thermocouple junction (104) and an electronic signal generator (101) for generating an acoustic frequency driving signal across the junction (104), which causes the system (100) to generate an acoustic wave (105) via the Peltier effect.

Provided is a thermally excited pressure wave generating element capable of generating a higher sound pressure. This pressure wave generating element is a thermally excited pressure wave generating element, and is provided with: a first solid insulating layer having a first main surface; a first metal layer provided on the first main surface of the first solid insulating layer; a second metal layer disposed at a distance from the first metal layer in the thickness direction of the first solid insulating layer; a first electrode electrically connected to one end side of the first metal layer and one end side of the second metal layer; and a second electrode electrically connected to the other end side of the first metal layer and the other end side of the second metal layer, the first solid insulating layer being located between the first metal layer and the second metal layer.

A thermoacoustic heat distribution system (100) is provided. The system includes a base (102) comprising a first surface (104) and a second opposite surface (106), a mounting structure (114C, 114D) for holding the base (102) to a supporting surface (116), a heating medium (108) applied on the base (102), an electrically conductive structure (110) arranged with the base (102), a power supply unit (112) and a magnet unit (118). The power supply unit (112) is configured to increase the temperature of the heating medium (108) and to circulate a pulsating electric current through the electrically conductive structure (110). The magnet unit (118) is configured to generate a magnetic field which interacts with the pulsating electric current, causing the base (102) to vibrate.