Do you want to measure close to the face of the ultrasound transducer or make CW measurements? Would you like to measure the acoustic pressure and associated thermal effects of a high intensity field ? If so the fibre-optic hydrophone is the best instrument available.
For more information see the paper " A Fabry–Pérot fiber-optic ultrasonic hydrophone for the simultaneous measurement of temperature andacoustic pressure" in J. Acoust. Soc. Am., Vol. 125, No. 6, page 3611, June 2009
Description
The fibre optic hydrophone is the latest addition to our hydrophone range. Despite its 10um active diameter the sensitivity is similar to larger element needle hydrophones. This, coupled with, its immunity from electro magnetic radiation makes it particularly suited for high frequency measurements in hostile fields.
The system can be used in high intensity fields where needle or membrane hydrophones may experience serious damage. Replacement fibres are readily available and inexpensive.
The hydrophone can be used to measure temperature and pressure, at the same time, and at the same point in the field. This enables a direct correlation to be made between pressure and thermal changes.
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| tapered fibre tip to ensure optimum frequency response over a wide frequency range | System supplied with replacement fibres |
Specification
| Output Impedance: | 50 ohm terminated system |
| Typical Probe Sensitivity: | plain sensor 100mV/MPa at 3MHz tapered sensor 200mV/MPa at 3MHz |
| Sensitivity Tolerance: | Sensitivity variation between individual probes is approx. +/-3dB |
| Usable Frequency range: | 250kHz to 50MHz (may require calibration at NPL, London for some frequency ranges) |
| Dynamic range: | 10kPa to 15MPa. Note the system has been tested in a field in excess of 700Wcm-2 with no damage |
| Typical Frequency Response: | to be advised please contact us |
| Sensor Material: | 10 micron parylene on glass backing |
| Sensor Dimension: | 10 micron diameter |
This specification is subject to change without notice.
For further details contact Dr Paul Morris on 01305 264669
