Abstract:
A method for ascertaining at least one pipe wall resonance frequency of a pipeline in the region of a measuring point by means of a field device of process measurements technology having at least a first ultrasonic transducer, which is placed on the pipeline at the measuring point, comprising steps as follows: providing a first transfer function Utransducer(f) at least of the first or a plurality of ultrasonic transducers located in the region of the measuring point; ascertaining a received spectrum Urec(f) from a received signal Urec(t) after transmission of an ultrasonic signal; ascertaining a second transfer function Umeasuring point(f) from the first transfer function Utransducer(f) of the first or the plurality of ultrasonic transducers and from the received spectrum urec(f), wherein the second transfer function Umeasuring point(f) is characteristic for the measuring point; and ascertaining the at least one pipe wall resonance frequency fres, especially a plurality of resonance frequencies, in the region of the measuring point by evaluating the second transfer function Umeasuring point(f) from step III, as well as a clamp-on, ultrasonic, flow measuring device, a method for ascertaining flow, a method for ascertaining a change of the measuring point and an identification device.
Abstract:
An arrangement comprising an ultrasonic transducer and a damping element with a longitudinal axis, which damping element connects the ultrasonic transducer with a housing- or measuring tube wall. The transducer has an end piece with a medium-contacting surface, from which ultrasonic signals are transferred into a gaseous or liquid medium. The damping element has at least two annular grooves and an annular mass segment arranged therebetween, characterized in that the damping element has a first eigenfrequency, in which the annular mass segment executes an axial movement parallel to the longitudinal direction of the damping element. This first eigenfrequency is the highest eigenfrequency, in the case that a plurality of eigenfrequencies are present, in the case of which the annular mass segment executes an axial movement parallel to the longitudinal direction of the damping element, and the damping element has a second eigenfrequency, in which the annular mass segment executes a rotary movement. This second eigenfrequency is the lowest eigenfrequency, in the case that a plurality of eigenfrequencies are present, in the case of which the annular mass segment executes a rotary movement, will and wherein the ratio of the first eigenfrequency to the second eigenfrequency is less than 0.75; and a field device of process measurements technology.
Abstract:
An arrangement of ultrasonic transducers of a clamp-on ultrasonic measuring device includes at least one pair of ultrasonic transducers, which include: in a measurement arrangement, an axial arrangement distance relative to a measurement tube axis; an emitting transducer apparatus designed to generate an ultrasonic signal field, which has, in the coupling body, a first longitudinal axis parallel to a transducer longitudinal axis; the ultrasonic signal field has an opening angle in the medium; the first longitudinal axis defines a reference signal path; the reference signal path defines an axial reference distance of a reference arrangement relative to centroids of the ultrasonic transducers; the axial arrangement distance is determined by the centroids; the arrangement distance is less than the reference distance; and a target difference between the reference distance and the arrangement distance is dependent on at least the opening angle of the ultrasonic signal field in the medium.
Abstract:
A method for putting into operation and/or checking an ultrasonic, flow measuring point using a service unit, wherein the service unit has a display unit and a camera, wherein the measuring point includes a pipeline for conveying a medium and at least one ultrasonic transducer, includes identifying the measuring point vis a vis the service unit; ascertaining settable parameters based on the identity of the measuring point; registering geometric data of at least one part of the measuring point by means of the camera; analyzing registered geometric data and deriving at least one parameter value for at least one of the parameters to be set based on the analytical result and the identity; ascertaining at least one optimum mounting position based at least on the derived parameter value; and mounting an ultrasonic transducer at one of the ascertained optimum mounting positions.
Abstract:
An arrangement for transmitting and/or receiving an ultrasonic, wanted signal in a measured medium, comprising a vibration decoupling element for securing at least one ultrasonic transducer in a containment, characterized in that the vibration decoupling element has a platform for securing the vibration decoupling element to a sensor nozzle or to the containment and a second interface for securing an ultrasonic transducer. Between the second interface and the platform a vibration decoupling structural element is arranged, which structural element is embodied as a solid body, which has one or more interfaces with other elements of the vibration decoupling element, especially with the second interface for securing the ultrasonic transducer and/or the platform, and wherein the structural element (11, 39, 55, 75) has an as much as possible spherical-, ellipsoidal-, toroidal- or polyhedral shape.
Abstract:
Disclosed is an ultrasonic transducer mounting assembly comprising an ultrasonic transducer element, a transducer housing inside which the ultrasonic transducer element is arranged, and an accommodation unit inside which the transducer housing is clamped in a clamping section. The disclosed assembly is characterized in that the clamping section comprises at least one bearing that has at least one rolling element, in particular at least one ball bearing that has at least one ball, for acoustically decoupling the transducer housing from the accommodation unit.
Abstract:
An arrangement for transmitting and/or receiving an ultrasonic, wanted signal in a measured medium, comprising a vibration decoupling element for securing at least one ultrasonic transducer in a containment, characterized in that the vibration decoupling element has a platform for securing the vibration decoupling element to a sensor nozzle or to the containment and a second interface for securing an ultrasonic transducer. Between the second interface and the platform a vibration decoupling structural element is arranged, which structural element is embodied as a solid body, which has one or more interfaces with other elements of the vibration decoupling element, especially with the second interface for securing the ultrasonic transducer and/or the platform, and wherein the structural element (11, 39, 55, 75) has an as much as possible spherical-, ellipsoidal-, toroidal- or polyhedral shape.
Abstract:
A method for monitoring the operating state of a first ultrasonic transducer in an ultrasonic, flow measuring device having at least one measuring tube and at least two ultrasonic transducers, including steps as follows: a) providing a first value or a plurality of first values, which relate to the geometric arrangement of the first ultrasonic transducer in the measuring tube and/or to the geometric arrangement of the first ultrasonic transducer relative to a second ultrasonic transducer; b) ascertaining a second value or a plurality of second values for a flow velocity of a medium located in the measuring tube c) providing a third value and/or a plurality of third values for temperature and/or pressure of the medium located in the measuring tube; d) simulating a desired value of a signal strength taking into consideration the first, second and/or third values; and e) comparing the simulated desired value of a signal strength with an ascertained real value of the signal strength.
Abstract:
A measuring device for measuring flow and/or composition of a measured medium in a pipe or tube by registering an ultrasonic measurement signal includes a measurement transmitter and a connection adapter for mechanical securement of the measurement transmitter on the pipe or tube, in which the connection adapter has a longitudinal axis and the measuring device includes a measuring transducer element and at least one metal hose, wherein at least one signal transmission cable is arranged in the metal hose for signal transmission between the measurement transmitter and a sensor element, and wherein the metal hose mechanically connects the measuring transducer element with the connection adapter.
Abstract:
The invention relates to an ultrasonic transducer comprising an acoustic transformer, wherein the acoustic transformer has a transformer body having a hollow space, and there lies between the hollow space and the medium a membrane, whose center oscillates freely. Furthermore, the invention relates to methods for manufacturing such an acoustic transformer.