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Electret Hydrophone Amplifier

user4476454
Prodigy 20 points

Hi!

My purpose is to use four hydrophones to detect location of a acoustic pinger. I have electret hydrophone which produces output electrically equivalent to electret condenser microphones. I have to measure time difference of arrival (TDOA) between these hydrophones. The pinger adjustable frequency is within 20kHz to 50kHz. At the end, the amplified signal will be passed to the 3V operating FPGA. The hydrophones specifications are follow:

Sensitivity: 180dB re: 1V/uPa (+- 4dB 20Hz-4kHz)

Range: 10 Hz to 100kHz

Type: Omnidirectional

O/P impedance: 2 kOhm

Power: 0.3 mA 

What is the best amp suitable for this application?

  • 0
    Genius 3295 points
    A little more info would be helpful; how much gain do you need? Do you need to variable gain? Low power?
  • 0
    TI__Guru* 95355 points
    Hi,

    Welcome to E2E

    As Mike said, could you share more details about your application and what does it need? Like supply voltage range, gain...
    Perhaps and opamp preamplifier could be the path to follow.

    Best regards,
    -Ivan Salazar
    Texas Instruments
  • 0 in reply to Ivan Salazar
    Prodigy 20 points

    Thanks for your reply.

    Actually my application is to use four hydrophones to localize underwater sound source. All the hydrophones are synchronize to measure time difference of arrival (TDOA) so that the source location could be estimated mathematically (multilateration principle). The source could generate a ping signal with frequency range of 20 kHz to 50kHz. However, only one frequency will be selected for operation at a time (frequency is selectable). I have to design an amplifier circuit to satisfy this requirement so that ADC could be performed on the signal before pass to the FPGA. The hydrophones have electric properties similar to the electret condenser microphone. I'm not good in analog design. So, I'm not really sure how to design an amplifier in a proper way and what is suitable opamp should i use. Supply voltage range will be in the range of 5 to 12V. Single supply is preferable. Any guide I could follow?    

    Helmi

  • 0 in reply to user4476454
    Genius 3295 points
    Hi Helmi,

    If you need some further help with this please PM me directly.

    Mike T.