A rectifier and a flowmeter, the rectifier including a fairing, wherein a first rectifying section (1) positioned at the upstream, a reducing section (2) positioned at the midstream and a second rectifying section (3) positioned at the downstream, can be arranged in the fairing. The first rectifying section and the second rectifying section are respectively provided with a group of rectifying channels parallel to the flow direction of fluid, and a through-hole (21) can be formed in the reducing section. The rectifier can provide improved rectification effects.

A gas flow conditioner in the flow bend in an ultrasonic flow meter has at least one longitudinal dividing plate provided in an inner space of the flow bend. The flow bend can be provided with an inlet curved section, a middle straight section, and an outlet curved section, wherein axes of the inlet curved section and the outlet curved section are in a parallel direction and connected to a pipe opening of size DN.

An ultrasonic transducer for an ultrasonic flowmeter includes a transducer housing and a transducer element arranged in the transducer housing for generating and/or receiving ultrasonic signals at least in a useful frequency range of the ultrasonic transducer. The transducer housing has an ultrasound window in the region of the transducer element for transmitting the ultrasound signals between the interior and the exterior of the transducer housing. The transducer housing has a fastening section for fastening the ultrasonic transducer to a measuring tube. The transducer housing extends with a transition section between the ultrasound window and the fastening section. The transition section of the transducer housing has, in an attenuation region, a phononic crystal with an acoustic band gap in the useful frequency range, so that the transmission of ultrasonic signals in the useful frequency range between the ultrasound window and the fastening section is at least attenuated.

According to the invention there is provided a flowmeter (10) includes a body (12) defining a passageway (14) for allowing fluid to flow therethrough and a sensing arrangement (16) which extends substantially inwardly from opposing end regions (18) of the passageway (14) for sensing a flow of fluid through the passageway (14) along an axis (20) which is substantially parallel thereto.

A flow sensor sub-assembly for sensing flow of a fluidic medicament is disclosed. The flow sensor sub-assembly includes a first spring contact and a second spring contact. The spring contacts are secured to a base that has a circuit for conducting an electrical signal to and from the spring contacts to a microprocessor. The first spring contact is in electrical communication with a first piezo element and the second spring contact is in electrical communication with a second piezo element. The first spring contact has a first contact force against the first piezo element and the second spring contact has a second contact force against the second piezo element, and the first and second contact forces are equivalent. A circuit board for interfacing to a flow sensor having a plurality of piezo elements for transmitting a flow signal indicative of flow of fluidic medicament is also disclosed.

A transducer for non-invasive measurement includes: a shear-type piezoelectric element; and a host material. The shear-type piezoelectric element is mounted to a first face of the host material. A second face of the host material is mountable to a wall of a vessel that holds a liquid. When the second face of the host material is mounted to the wall of the vessel, the transducer when activated at an activation frequency launches a Lamb wave into the wall of the vessel. The transducer is designed such that a phase velocity of the Lamb wave in the wall of the vessel is greater than a speed of sound in the liquid held by the vessel.

Techniques are described herein for displacing liquid away from a signal path of sonic signals in a signal anemometer. A sonic anemometer may include a membrane positioned between a sonic transducer and the open environment. The membrane may be formed of a hydrophobic material that repels the liquid. The membrane may also include a plurality of pores that impede the flow of liquid through the membrane but enables sonic signals to pass through the membrane. The sonic anemometer may also include a reflector that displaces liquid away from the signal path of the sonic anemometer. The reflector may include one or more pores that wick liquid away from the signal path.

A fluid measuring arrangement with a flow channel for a fluid to be measured having at least two areas of an outer wall forming waveguide parts for surface acoustic waves. The waveguide parts are spaced apart from each other along the circumference of the flow channel. A first and/or a second signal converter is arranged at each waveguide part, wherein at least two first signal converters arranged on different waveguide parts or two second signal converters arranged on different waveguide parts are spaced with respect to each other in the axial direction of the flow channel.

An ultrasound flow measurement device has a vessel through which a fluid to be measured flows. An ultrasound measurement configuration with an ultrasound transducer is provided for measuring a propagation time of an ultrasound signal containing a plurality of periods along a measurement section that runs partly in a direction of flow. A controller determines a fluid flow on a basis of a propagation time measurement. The controller contains a memory, a first evaluator for determining a period duration of at least one of the periods of an ultrasound signal received after passing through the measurement section, a second evaluator for determining a spread value of a predetermined number of last received ultrasound signals, a comparator for comparing the spread value with a threshold value, and an actioning device for initiating a control action, assigned to the threshold value that has been exceeded, for the ultrasound flow measurement device.

A flow sensor includes a fluid chamber configured to receive a fluid. A diaphragm assembly is configured to be displaced whenever the fluid within the fluid chamber is displaced. A transducer assembly is configured to monitor the displacement of the diaphragm assembly and generate a signal based, at least in part, upon the quantity of fluid displaced within the fluid chamber.