摘要:
The invention relates to an ultrasonic flow meter (1) comprising: a measurement pipe (2), which measurement pipe (2) has a measurement pipe wall (11), at least in some parts a basic shape having a rotationally symmetric or polygonal cross-section, and a straight measurement pipe axis (M); a transmitter (15) for transmitting an acoustic signal on a first signal path (8); and a receiver (9) for receiving the acoustic signal on the first signal path (8); wherein the measurement pipe (2) has a plurality of reflection surfaces (6.1–6.5), by which the acoustic signal on the first signal path (8) is reflected multiple times, and wherein the reflection surfaces (6.1–6.5) are integrally formed from the measurement pipe wall (11), the reflection surfaces (6.1–6.5) for reflecting the acoustic signal being designed in such a way that one or more of the reflection surfaces (6.1–6.5) at least partially protrude into the basic shape of the measurement pipe (2) and one or more of the reflection surfaces (6.1–6.5) project outward at least from the basic shape of the measurement pipe (2).
摘要:
The invention relates to a coupling element of an ultrasonic transducer for an ultrasonic flow meter, suitable for mode conversion of an acoustic longitudinal wave between a coupling input surface and a coupling output surface of the coupling element by reflection at a first boundary of the coupling element to a prescribed medium, wherein the coupling element comprises a second boundary to a prescribed medium, wherein a first angle between the coupling input surface and the first boundary and a second angle between the first boundary and the coupling output surface are selected so that a portion of transverse waves is reflected at the first boundary to the coupling output surface, and wherein the first angle between the coupling input surface and the first boundary and a third angle between the first boundary and the second boundary are selected so that a portion of the longitudinal waves is reflected at the first boundary to the second boundary, and that a portion of the longitudinal waves reflected to the second boundary is reflected back into the coupling element at the second boundary, wherein the centroid of the second boundary is offset to a plane in the direction of the surface normals of the coupling output surface through the centroid of the coupling output surface, to which plane the surface normal of the coupling output surface is perpendicular and in which plane the centroid of the coupling output surface lies.
摘要:
The invention relates to a method for determining a characteristic variable for evaluating a measuring arrangement comprising a clamp-on ultrasonic flowmeter and a tube on which the clamp-on ultrasonic flow meter is secured, and/or for evaluating the measuring operation of the measuring arrangement, characterized by the following steps: A providing parameters with respect to excitation signals generated by the clamp-on ultrasonic flowmeter; B providing sensor-specific data with respect to the acoustic characteristics of one or multiple ultrasonic transducers of the clamp-on ultrasonic flowmeter; C inputting data with respect to the tube material and the tube wall thickness, in particular by a user; D determining the characteristic variable from the parameters and data from steps A-C based on a mathematical model, as well as a computer program product and a clamp-on ultrasonic flowmeter.
摘要:
The invention relates to a method for ascertaining a compensated flow and/or a compensated flow speed. The compensation of a flow-related measurement error is carried out by means of an analyzing unit (11, 21) of a flow measuring device and/or a computer during a flow measurement using a two-path measurement of an ultrasonic flow measuring device, comprising an arrangement of at least two ultrasonic converter pairs (12-15, 22-25) on a pipe (5, 16, 26), said ultrasonic converters (12-14, 22-24) assuming a 180° two-path single-traverse or a 90° two-path double-traverse arrangement. The method is characterized by the following steps: a) feeding information relating to the flow-influencing pipe element (6a-6d) type into the analyzing unit (11, 21) and/or the computer; b) feeding information relating to the distance (x a -X d ) of the arrangement of the ultrasonic converter pair (1, 2, 12-15, 22-25) to the flow-influencing pipe element (6a-6d) into the analyzing unit (11, 21) and/or computer; c) compensating for a measurement error using a correction factor k D as a function of the information from steps a) and b); and d) ascertaining a flow corrected by the correction factor k D and/or a flow speed corrected by the correction factor k D . The invention also relates to an ultrasonic flow measuring device and a computer program product.
摘要:
The invention relates to an ultrasonic flow and particle measuring system (1), comprising a first ultrasonic transducer (2) and at least one further, second ultrasonic transducer (3), wherein the first ultrasonic transducer comprises at least one first ultrasonic transducer element (4) and at least one first coupling element (5), wherein acoustic signals can be emitted and received by the first ultrasonic transducer element (4) during operation via the first coupling element (5). The first and second ultrasonic transducers (2, 3) are arranged in a measuring tube (8) for determining the flow such that the acoustic signals propagate along at least one signal path (9) in the measuring tube (8) between the first and the second ultrasonic transducers (3), wherein at least the first coupling element (5) is designed as an acoustic lens. The ultrasonic flow and particle measuring system (1) comprises an evaluation unit, which is suited to analyze the amplitude of reflection signals of acoustic signals reflected by particles to the first ultrasonic transducer (2), wherein in a predetermined time interval a number of amplitudes of the reflection signals can be counted using the evaluation unit, which are greater than a predetermined threshold value. The invention further relates to a method for determining the flow of a measuring medium through a measuring tube (8) and for detecting particles in the measuring medium using an ultrasonic flow and particle measuring system (1) according to the invention.