COOMET.AUV.W-S1 supplementary comparison of free-field hydrophone calibrations in the frequency range 250 Hz to 8 kHz

Isaev, А. Е.; Yi, Chen; Matveev, А. N.; Ping, Zihong

doi:10.1088/0026-1394/52/1a/09001

Cited by 6 publications

(3 citation statements)

References 5 publications

(8 reference statements)

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“…The knowledge of the variation in hydrophone sensitivity with temperature is important in applications such as acoustic material characterisation and use of hydrophones for mapping transducers at body temperature, when the temperature of the water bath is different from the one used for calibration. It would also benefit international comparisons of hydrophone calibrations [6,7].…”

Section: Overviewmentioning

confidence: 99%

Characterisation of hydrophone sensitivity with temperature using a broadband laser-generated ultrasound source

et al. 2023

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In this work, we present a novel method for characterising the relative variation in hydrophone sensitivity with temperature, addressing a key aspect of measurements in the field of ultrasound metrology. Our study focused on a selection of miniature ultrasonic hydrophones commonly used in medical applications. The method is based on using water as a temperature-sensitive laser-generated ultrasound (LGUS) source for calibration, allowing for flexible characterisation across a wide temperature range. The measurements were performed using both the LGUS method and the established self-reciprocity method. Our results demonstrate good agreement within 5 % between the two methods, validating the effectiveness of the LGUS approach. We found that the sensitivity of the tested hydrophones exhibited low temperature dependence less than -0.20 % per °C within the studied temperature range from 17 °C up to 50 °C. The presented LGUS method offer greater flexibility than current approaches as it allows for characterisation of membrane hydrophones with small element sizes and non-electrical transducers. By combining the relative sensitivity variation obtained through the LGUS method with the standard calibration at room temperature, absolute values of hydrophone sensitivity can be determined. The expanded uncertainty of our measurements, which was evaluated at temperature intervals of 8 °C, was determined to be on average 10%. Our work provides valuable insights into the temperature dependence of hydrophone sensitivity and lays the foundation for further investigations in this area. The LGUS method holds promise for future enhancements, such as increased bandwidth of the LGUS source and frequency domain analysis, to explore the frequency dependency of sensitivity variation with temperature.

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Section: Overviewmentioning

confidence: 99%

Characterisation of hydrophone sensitivity with temperature using a broadband laser-generated ultrasound source

et al. 2023

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“…This is done to anticipate a difference in sensitivity among the hydrophones [13] and [14]. Normalization process has been conducted with a setup as Figure 2.…”

Section: Hydrophone Normalizationmentioning

confidence: 99%

Ambient Noise Characterization of Shallow Water Environment

Santoso

2016

emitter

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Understanding of environmental characteristic is a key factor in design of communication system. This paper describes an ambient noise characterization of measurement in the shallow water of Surabaya bay. The result showed that probability density function (pdf) of ambient noise is close to a Gaussian distribution with the mean of -2.85x10 -5 and deviation standard of 9.87x10 -4 . Validation has been done by using mean square error (MSE) and Bhattacharya distance. Fitting between cdf of measurement result and theory was done by using MSE with the value of and Kolmogorov Smirnov test with the value of 3.9x10 -4 and 4.9x10 -2 respectively. In the frequency domain analysis, it is showed that in the range of 0 ~ 9 kHz has a deceasing level from -100 until -140 dB. In the frequency of 9 ~ 13.5 kHz, the spectral is flat as like a white. It can be used as a reference in decision of range frequency of underwater acoustic communication systems that will be applied.

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“…The method utilizes the information of the water tank employed for measurements, and extends the low frequency limitation from 1.25 kHz to 250 Hz. The efficacy of the method has been validated by comparison calibrations between Hangzhou Applied Acoustics Research Institute and Russian Metrological Institute of Technical Physics and Radio Engineering (VNIIFRI) [19,20].…”

Section: Introductionmentioning

confidence: 99%

Calibration of hydrophones using a frequency domain filter processing method: theory and experiment

Yang

Zhou

et al. 2020

Meas. Sci. Technol.

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To eliminate the interferences coming from the boundaries of a water tank and extend its low frequency calibration limit, a frequency domain filter processing (FDFP) method is proposed for hydrophone calibration measurements. The frequency domain filter function is designed according to the a priori spatial position of projector and hydrophone pair in a water tank. A simultaneous comparison method is used for calibration, and a wideband pink noise pulse signal is transmitted. After application of the FDFP method, the transfer impedances of projector and hydrophone pairs in a quasi-free-field are obtained, and interferences reflected from the boundaries of the water tank are effectively eliminated. To verify the FDFP method, an experimental system is established for calibration of the free-field sensitivity of a TC 4033 hydrophone. For a non-anechoic water tank of 1.5 m × 0.88 m × 0.90 m, the lowest calibration frequency is extended from 20 kHz to 3.15 kHz, and the calibration result is consistent with the free-field reciprocity calibration result obtained in an anechoic water tank of 50 m × 15 m × 10 m in the frequency range 3.15 kHz to 31.5 kHz.

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COOMET.AUV.W-S1 supplementary comparison of free-field hydrophone calibrations in the frequency range 250 Hz to 8 kHz

Cited by 6 publications

References 5 publications

Characterisation of hydrophone sensitivity with temperature using a broadband laser-generated ultrasound source

Characterisation of hydrophone sensitivity with temperature using a broadband laser-generated ultrasound source

Ambient Noise Characterization of Shallow Water Environment

Calibration of hydrophones using a frequency domain filter processing method: theory and experiment

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