4.0mm Needle Hydrophone

This probe has outstanding sensitivity and is ideally suited to the measurement of lower frequency fields.



Although optimised for lower frequencies, these probes can be used for higher frequency measurements (particularly of very weak signals). In such situations the inherent directivity and spatial averaging characteristics of a 4mm aperture means that care should be taken in interpreting data.

All dimensions are in mm. All probes are hand made and as such there is always some variation between individual devices. Please contact us if the actual dimensions are critical to your work.

4mm hydrophone

Technical Specifications

Output Impedance: 27pF+/- 4pF
Typical Probe Sensitivity: 8V/MPa (equivalent to -222dB re 1V/uPa) averaged over the range 0.8-8MHz when measured at the output of a correctly terminated HP1 Submersible Preamplifier
Sensitivity Tolerance: Sensitivity variation between individual probes is approx. +/-3dB
Typical Frequency Response: Flat (+/-2dB): 200kHz to 3MHz
Flat (+/-4dB): 80kHz to 8MHz
Minimum calibration frequency 10kHz
Sensor Material: 28 micron thick gold electroded Polyvinylidene fluoride (PVdF) film
Sensor Dimension 4.0mm diameter disc

* Precision Acoustics reserves the right to change the specification without notice.

Contact Us

If you would like more information about this product please get in touch by phone, email or enquiry form. Alternatively complete our online quote form below.

+44 (0) 1305 264669

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