Onda_HM_DataSheet.pdf
HM Hy drophones The HM Series membrane hydrophone s are designed for measuring pulsed ultrasound elds. Their extremely at sens itivity results in the best reproduction of acoustic waveforms. Version A is th e tradition…
HM Hydrophones
The HM Series membrane hydrophones are designed for measuring pulsed
ultrasound elds. Their extremely at sensitivity results in the best reproduction
of acoustic waveforms. Version A is the traditional hydrophone conguration, and
a more rugged version B prevents membrane vibration during scanning motion.
Version A is recommended for high power ultrasound work, where the absorption
of energy by the backing could result in damage to the hydrophone. Both types
are excellent choices as in-house primary or secondary standard, and for general
purpose eld mapping.
Features
Rugged
High Sensitivity
Broadband
Sealed design
Integral preamplier
Choice of aperture sizes
Models
HMA — free membrane
HMB — backed membrane
Technical Specications
* Provided with traceable calibration 1-20 MHz at 50 KHz intervals. For other calibrations available visit
our web site.
** Based on criterion dened by the International Electrotechnical Commission (IEC)
Putting Condence in Ultrasound
Revised: October 15, 2015
HM Hydrophone
HMA-0200 HMA-0500 HMB-0200 HMB-0500
Frequency range (±3dB) 0.5 to 45 MHz
Nominal Sensitivity [dB re 1V/Pa] * -260 -248 -256 -244
Max Pressure (p-p) within Linearity
Range of Integral Preamp (MPa) **
53 12 25 7
Output Impedance
50
Max. Operating Temperature 40 ºC
Nominal Sensitivity [nV/Pa] 100 398 158 631
Specications are subject to change without notice.
1290 Hammerwood Avenue, Sunnyvale, CA 94089, USA | Tel: 408.745.0383 | Fax: 408.745.0956 | www.ondacorp.com
Typical Sensitivity Plot
Typical Directivity Plot
Mechanical
Universal Power Supply Included
POWER
At 5 MHz