Hydrophone Preamplifier Optimization-Hybrid Microelectronics for Low- Noise Hydrophones

Brown, Craig K.; Tims, A. C.

doi:10.21236/ada058590

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(2 citation statements)

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“…It directly affects the equivalent noise pressure spectral density level and dynamic range of the underwater acoustical measurement system. Much attention [2][3][4][5] had been paid to modelling, measurement and optimization of self-noise of hydrophones with preamplifiers in the past. Tims [3] studied the hydrophone preamplifier optimization in 1978, and proposed an equivalent circuit noise model including acoustic sensor, coupling network and preamplifier input stage for predicting the self-noise of hydrophone with preamplifier.…”

Section: Introductionmentioning

confidence: 99%

“…Tims [3] studied the hydrophone preamplifier optimization in 1978, and proposed an equivalent circuit noise model including acoustic sensor, coupling network and preamplifier input stage for predicting the self-noise of hydrophone with preamplifier. Brown and Tims [4] continued the optimization work, they studied the hybrid microelectronics for low-noise hydrophones, and presented a DC and low-frequency AC analysis of a lownoise preamplifier design in 1987. In 1993, Straw [5] developed a noise prediction model of hydrophone preamplifier system, which could be used for calculating the electronics noise of preamplifier and hydrophone.…”

Section: Introductionmentioning

confidence: 99%

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Modelling, measurement and optimization of self-noise of hydrophone with preamplifier

et al. 2019

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Self-noise is an important specification of hydrophone with preamplifier. This paper presents the modelling, measurement and optimization of the self-noise of hydrophone with preamplifier. Through analyzing various noise sources of hydrophone and its preamplifier, an effective self-noise model of hydrophone with preamplifier was established, and the self-noise was mainly affected by the hydrophone quality factor, preamplifier noise and thermal noise of preamplifier input resistance. In order to measure the self-noise of hydrophone with preamplifier, a measurement system was constructed and used for measuring the self-noise of a RHSA30 hydrophone which manufactured by Hangzhou Applied Acoustics Research Institute (HAARI) and has a typical sensitivity of -173 dB. After optimization of the self-noise of RHSA30 hydrophone, the measured equivalent noise pressure spectral density level was close to 30 dB at the frequency of 1000 Hz. The measurement results proved that the preamplifier current noise which mainly coming from the Operational Amplifier played a leading role at low frequencies of hydrophone with preamplifier. And some basic principles for self-noise optimization of hydrophone with preamplifier were given at the end.

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