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PGA450-Q1: reducing measurements blind spot limit

Eyal Ron
Intellectual 295 points
Part Number: PGA450-Q1
Other Parts Discussed in Thread: PGA460

Hi,

 

our company uses PGA450Q1 connected to a waterproof transducer.

this gives us measuring range of >~35 cm up to ~4m.

we would like to reduce minimal distance to ~3cm. 

of course, working with our signal transducer is not an option but I was wondering if you can recommend on a different setup.

for example - is it possible to work with 2 waterproof transducers and configure 1 transducer to receive the the other to transmit?

can you recommend on any different waterproof parts\setup? 

 

Thanks,

Guy 

  • 0
    TI__Mastermind 18545 points

    Hello Guy, 

    Our part expert is currently out of office and will provide additional comment when they are back, but in the meantime, what is the frequency of your transducer? 

    Best Regards, 

    Justin Beigel

  • +1 in reply to Justin Beigel
    TI__Genius 9216 points

    Hello Guy, 

    I am happy to support your question here. 

    It is possible to realize a PGA450 solution with dual transducers( 1Tx,1Rx). To accomplish this on the PGA450 EVM you will open jumper XFRM (JP3) such that the excited transducer is disconnected from the echo return input path. Then, connect the receiving transducer's pins to the XFMR RETURN net (via the test point or pin 2 of JP3) and GND.

    This hardware change should allow you to realize short range measurements. It may however be necessary to modify software parameters such as the qualification threshold to function optimally with your changes.

    Finally, the PGA460 is the recommended device to replace the PGA450. The details of the device can be viewed here: Ultrasonic FAQ

    Please let me know if you have any questions.

    Thank you,

    Jacob