| 摘要 |
Method for verifying the reliability of ascertained measurement data from an ultrasonic flow measurement according to the transit-time difference method, wherein an ultrasonic flow meter having at least two ultrasonic transducers is used to emit and receive ultrasound signals transversely in a flow direction or counter to a flow direction of a measurement medium, wherein within a first time window prior to receipt of a first useful ultrasound signal, which propagates substantially through the measurement medium between the transducers, a first ultrasound interference signal is recorded, wherein the first ultrasound interference signal propagates at least partially in the measurement medium between the ultrasound transducers, wherein within a second time window prior to receipt of a second useful ultrasound signal, which propagates substantially through the measurement medium between the transducers, a second ultrasound interference signal is recorded, wherein the second ultrasound interference signal propagates at least partially in the measurement medium between the ultrasonic transducers; wherein the first and the second useful ultrasound signals are assigned in each case to two ultrasound signals which are transmitted in opposite directions through the medium, and wherein a quality criterion for evaluating the measurement uncertainty of a measurement value is ascertained, which is proportional to the transit-time difference ascertained from the first and second useful ultrasound signals, the ascertainment of which comprises a difference formation between the first and the second interference signal. |
