Are you confident your ultrasound machine is delivering the power you select? The ultrasound Power Meter gives you peace of mind.
Recent research shows that most of the 10,000 ultrasound machines in the UK fail to deliver within 30% of the correct power.
The Chartered Society of Physiotherapists states that the actual power generated by the ultrasound transducer must be within 20% of the amount indicated on the physiotherapy machine.
The ultrasound power meter is a small battery operated device which will allow physiotherapists to be reassured that their ultrasound equipment is delivering the correct power level.
By placing the treatment head on the Power Meter's unique sensor you can check the actual power generated by the transducer immediately before you place it on your patient.
The Power Meter measures the total power output of a physiotherapy ultrasound transducer in a few seconds.
Power Meter product information for physicists
The Power Meter is designed to measure the power output of physiotherapy ultrasound transducers. It is powered by a single 9 Volt alkaline battery and measures the total ultrasonic power delivered by the physiotherapy treatment head.
This is achieved using a pyro-electric sensor which is backed by an acoustical absorber.
The absorption coefficient of the acoustic absorber is such that most of the energy that is incident on the interface between the thin PVdF membrane and absorber, is absorbed. This absorbed energy produces head and due to the pyro-electric effect of the PVdF, the resultant rate of change of temperature is measured as a voltage across the PVdF electrodes.
The local rate of temperature rise is proportional to the time-averaged acoustic intensity and, when integrated over the whole beam, this will provide an output which is proportional to the ultrasonic power being generated by the treatment head.
The digital display is then calibrated to give the acoustic output in watts.
Physical Specification
| Sensor diameter | 60mm |
| Sensor material | single layers of 110 micron silver PVdF film backed by acoustic absorber |
| Power requirements | 9V alkaline battery ‘PP3' |
Acoustic Specification
| Dynamic range | 0.5-12W |
| Frequency range | 1 - 3MHz |
| Accuracy | Better than 20% |
The graph shows the Power Meter output signal for 3MHz physiotherapy transducer at nominal power of 1W
