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PGA460-Q1: PGA460-Q

Radoslaw GORDON
Prodigy 10 points
Part Number: PGA460-Q1
Other Parts Discussed in Thread: TUSS4440

Hello, I would like to make a distance (damage) measuring system on a steel plate. I thought about the PGA460-Q chip. However, the speed of sound in iron is 15-20 times faster than in air and the resolution is too low (the transit time of the pulse and its return is very small). Does TI have a circuit that can be used for such a measurement??
Regards, R. Gordon

  • 0
    TI__Mastermind 23005 points

    Hello Gordon,

    Thanks for posting to the sensors forum and thanks for the info! I think you may need to use a bi-static solution with two separate transducers and AFEs, since the return would be very fast due to your extremely fast speed of sound the device may still be transmitting while its expecting an echo. During the transmit time the transducer is saturated and cannot see any incoming echoes.

    My suggestion would be to try using TUSS44x0, these are our analog output devices, this would let you see the analog signal of the return echoes on the AFE after some analog filters and amplification. To propagate signals through a solid a large signal is typically required which might be the reason you are not getting very large echo responses, you may need to use the TUSS4440 since it can be used to drive a transformer to create a large enough signal to  properly penetrate the steel plate you are looking at.

    I hope this helps!

    Best,

    Isaac