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Precision Acoustics - 0.075 mm Needle Hydrophone for High-Frequency, High-Pressure Measurements
The 0.075 mm needle hydrophone is engineered to provide a reliable signal-to-noise ratio, making it suitable for high-frequency, high-pressure fields where minimizing spatial averaging is crucial. Constructed with PVdF material, it can operate in various liquid environments, including water, castor oil, and mineral oil, though caution is advised with some chemicals. Its precision construction allows for accurate ultrasonic intensity measurements, and it stabilizes within an hour of soaking. When used, the hydrophone should be terminated with 50 Ω to ensure proper measurement accuracy. This device includes a preamplifier with an 8 dB gain, powered by a desktop power supply, to remove the DC component from the returned signal. Precision Acoustics manufactures transducers within the 0.2 MHz to 50 MHz frequency range, employing various materials tailored for specific applications. Calibration sensitivity is flexible, enabling conversion between pressure and voltage for peak-to-peak or RMS measurements.The 0.075 mm needle hydrophone has a good signal-to-noise ratio and we would recommend the use of this device in high frequency, high pressure fields to minimise the effect of spatial averaging.
Output impedance: 14 pF± 2 pF
Typical probe sensitivity: 10 nV/Pa (equivalent to -280.2 dB re 1V/uPa) averaged over the range 2 MHz – 12 MHz when measured at the output of a correctly terminated HP1 submersible preamplifier
Sensitivity tolerance: Sensitivity variation between individual probes is approximately ±3dB
Typical frequency response: Flat (±2 dB): 5 MHz to 15 MHz
Flat (±4 dB): 1 MHz to >30 MHz
Minimum calibration frequency 1 MHz
Sensor material: 9 micron thick gold electroded Polyvinylidene fluoride (PVdF) film
Sensor dimension: 0.075 mm diameter disc