The basics of applying ultrasonic transducers for sensing objects or fluid flow
Since this attenuation and the propagation speed are both known, it is possible to
This module requires only a few external components plus a power supply for operation (Figure 9). It is controlled by commands received from a PC-based graphical user interface (GUI), to which it returns data for display and further analysis. In addition to basic functionality and setting of operational parameters,
compensate for the unavoidable loss by “ramping up” the AFE gain versus time, effectively cancelling the attenuation versus distance effect. The result is that the system signal-to-noise ratio (SNR) is maximized regardless of the sensing distance, and the system can handle a wider dynamic range of received signals. To further explore the use of these transducers, Texas Instruments offers the PGA460PSM-EVM evaluation module, which works with PUI Audio’s UTR-1440K-TT-R 40 kHz ultrasonic transceiver (Figure 8).
it allows users to display the ultrasonic echo profile and measurement results.
Conclusion
Figure 8: The PGA460PSM-EVM evaluation module is based on the PGA460 and simplifies the exploration of ultrasonic system operation using the PUI Audio UTR-1440K-TT-R 40 kHz ultrasonic transceiver. (Image source: Texas Instruments)
Piezoelectric ultrasonic transducers provide a convenient and effective way to sense nearby objects and even measure their distance. They are reliable, easy to apply, and help
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