HFO-690 – Fiber-optic hydrophone measurement technology for high-power ultrasound
The Onda HFO-690 Fiber Optic Hydrophone was specially developed for the measurement of high-intensity ultrasound fields. Unlike conventional piezoelectric hydrophones, the HFO-690 operates with an optical fiber tip, making it suitable for sound pressures of up to 500 MPa.
A typical application area is the characterization of High Intensity Focused Ultrasound (HIFU). In addition to the acoustic pressure, the system can simultaneously Temperature captures and thus enables a comprehensive investigation of high-intensity ultrasound fields.
High bandwidth and spatial resolution
The HFO-690 offers an exceptionally wide frequency range of 3 kHz to 150 MHz and a spatial resolution of 100 µm. This also makes it possible to investigate complex and highly focused ultrasonic fields with high spatial resolution.
The nominal acoustic sensitivity is 6 mV/MPa. Bandwidth limiting filters allow adaptation to the respective measurement task while reducing the noise equivalent pressure.
Simultaneous sound pressure and temperature measurement
A special feature of the HFO-690 is the possibility to, to measure acoustic pressure and temperature simultaneously. The temperature measurement offers a sensitivity of 10 mV/°C; Onda specifies operation in water in the temperature range of 5 to 95 °C.
Especially in HIFU applications, this combination is interesting because, in addition to the acoustic field distribution, thermal effects can also play a significant role.
Robust against extreme ultrasonic fields
Conventional piezoelectric hydrophones can be damaged at very high acoustic intensities. In contrast, the fiber-optic measurement principle of the HFO-690 enables measurements at sound pressures up to 500 MPa, with Onda pointing out that the allowable load depends on the frequency content of the signal.
Furthermore, the optical probe is immune to electrical or electromagnetic interference. Ambient light is optically filtered so that interfering stray light has as little influence on the measurement as possible.
Simple alignment and handling
The HFO-690 is designed as a fully integrated measuring system and features a Touchscreen user interface. A visible light source facilitates the alignment of the fiber tip within the measurement setup.
Damaged fiber tips can be restored within a short time using a simple cleaving process. In addition, the system features a simple calibration routine for practical measurement use.
Typical applications
The HFO-690 is particularly suitable for measurement tasks where high sound pressure levels, a wide bandwidth, or a very small measurement area are required:
- HIFU and therapeutic ultrasound
- Characterization of high-intensity ultrasound fields
- Development of medical ultrasound systems
- High-resolution acoustic field measurements
- Simultaneous pressure and temperature measurements
- Research and development in the field of high-power ultrasound
Benefits of HFO-1336mzz-Z (Note: HFO-690 is an internal or alternative industry code, but standard translations of such technical terms focus on accuracy). *Better translation:* Benefits of HFO-690
- Sound pressures up to 500 MPa
- frequency range from 3 kHz to 150 MHz
- Spatial resolution of 100 µm
- Simultaneous pressure and temperature measurement
- Fiber optic measuring principle
- Immune to electromagnetic interference
- Bandwidth limitation filter for noise optimization
- Touchscreen operation
- Visible light for easy alignment
- Repairable fiber tip by simple cleaving
HFO-690 by Onda
The HFO-690 Fiber Optic Hydrophone combines an extremely wide dynamic and frequency range with high spatial resolution and the capability for simultaneous temperature measurement. This provides a specialized solution for the characterization of HIFU and other high-intensity ultrasound fields where conventional hydrophones reach their operational limits.
Soliton supports you in selecting and integrating suitable Onda hydrophone measurement technology for your ultrasonic application.
