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Original question:

TUSS4470: TUSS4470

TUSS4470: Minimal Detection Distance

Pete Sampson
Intellectual 440 points
Part Number: TUSS4470

Tool/software:

I'd like to be able to have a minimum detection distance of 0.1m but it looks like the noise from the intial ping will only allow for detections greater than 5ms. Also curious how frequncey is related to minimal detection distance and would like to understand the criteria and advantages/disadvantages for determining when to use 1, 2, 3, 4, etc., puses. 

 

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    TI__Mastermind 23045 points

    Hello Pete,

    Thanks for posting to the sensors forum!

    The minimum detection when using a single transducer is dependent on a couple of factors such as voltage, frequency of the transducer, and pulses emitted.

    A larger voltage will have a longer decay time, frequency is also a factor because this determines the period of the pulse, and the amount of pulses determines the amount of times this time period is repeated.

    If you would like to reduce the minimum distance you would need to separate to a TX and RX transducer with a device each, this is referred to as a bistatic solution. This helps prevent the RX transducer from being saturated as the signal is emitted from the TX transducer.

    The amount of pulses increases the sound pressure level that allows you to reach further distances. Since some of the SPL is lost when the sound is reflect or as it traverses through a medium sometimes you need to increase the number of pulses to ensure the signal has enough energy to return.

    Let me know if there are any other questions!

    Best,

    Isaac