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Precision Acoustics - 0.04 mm Needle Hydrophone for High-Pressure Field Measurement
The 0.04 mm needle hydrophone is suited for measuring high-pressure fields at frequencies above 40 MHz. Constructed with precision, each probe is handmade, leading to slight variations between devices. Designed for ultrasonic applications, the hydrophone can operate in liquids such as castor oil and mineral oil. Its PVdF construction, while durable, is susceptible to damage from certain chemicals. Proper usage involves soaking the hydrophone for at least one hour before measurements and promptly removing it from water post-use to avoid prolonged immersion damage. The device should be cleaned with lemon juice if calcium deposits form. For optimal data accuracy, the hydrophone output should be terminated in 50 ohms. While batteries can power the DC coupler, a desktop power supply is recommended for extended use. The hydrophone system supports calibration through peak-to-peak and RMS voltage measurements, ensuring reliable sensitivity data across a frequency range of 0.2 MHz to 50 MHz. For technical assistance or product inquiries, contact Precision Acoustics directly.The 0.04 mm needle hydrophone is recommended for use in measurements of high-pressure fields above 40 MHz.
All dimensions are in mm. All probes are hand made and as such there is always some variation between individual devices.
Output impedance: 14 ± 2 pF
Typical probe sensitivity: 6 nV/Pa (equivalent to -284.4 dB re 1 V/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 ±3 dB
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: 0.04 mm diameter disc