Durchflussmessung mit Ultraschall-Phased-Array-Sensoren (English shop)

Preview

Table of Contents, PDF (57 KB)
Extract, PDF (440 KB)

The development of flow sensors for fluids is characterised by wear-free and flexible measuring systems with high accuracy. The ultrasonic measuring principle discussed here is based on sound-reflecting suspended particles in the fluid, which are carried along in the flow without slip.

This work describes fused signal processing methods for determining the velocity of suspended particles in fluids. Together with a phased-array ultrasonic sensor, the successive measurement of the velocity profile along the cross-section becomes possible.

The realised sensor concept, consisting of a phased-array transducer, digital signal processor and microcontroller, is distinguished by the following features owing to the implemented evaluation methods:

● Use of phased-array technology
● Generation of two-dimensional flow models
● Increase in measuring range/velocity, SNR and information content through optimised signal coding
● Temporal tracking of reflector traces by means of object tracking methods
● Doppler frequency determination using estimation methods
● Fusion of Doppler and range information by means of Kalman and (J)PDA filters or spatial clustering methods