We are distributing products from Precision Acoustics , UK
Pressure / Intensity Measurements
The pressure field generated by ultrasonic equipment may be detected by miniature sensors known as hydrophones which convert the incident acoustic pressure waveform into an electrical signal. Selection of the correct type of hydrophone ensures accurate measurement of all types of ultrasonic fields. Precision Acoustics offers a full range of needle, membrane, piston and fibre-optic hydrophones
An acoustic wave transfers energy as it propagates. This is the power of the beam. It is measured in Watts and provided the whole of the acoustic beam is included in the measurement it is not dependent on position
Passive Acoustic Materials
Precision Acoustics is the sole agent for a range of acoustic materials which have been developed by the National Physical Laboratory and Acoustic Polymers Ltd.
The acoustic absorbers designed for test tank linings ensure that, whatever the working frequency, unwanted reflections are eliminated from acoustic measurements.
The radiation force balance targets completely absorb the acoustic beam to ensure accurate power measurements
PVdF and P(VdF-TrFE) Co Polymer Film
PVdF and its co-polymers are the two most widely known piezo-polymers. PVDF exhibits strong piezo- and pyro-electric response, and has an acoustic impedance that is much closer to water than conventional piezo-ceramic materials. These properties have made it highly desirable for the productions of ultrasonic sensors. PVdF is chemically resistant, and is mechanically resilient. However, its piezo-properties will start to degrade if exposed to elevated temperatures will begin to unlock the polarisation necessary for the piezo-electric properties of the film. As a general rule, PVdF should be kept and used below 60°C and exposure to temperatures above 100°C is likely to remove the majority of piezo-electric behaviour.
P(VdF-TrFE) is a co-polymer of PVdF with Trifloroethylene. It has greater piezo-electric output than PVdF and has better thermal stability with reported operating temperatures as high as 100°C. The disadvantage with co-polymer is that it tends to be a more difficult material to fabricate and stress cracks/fractures can be problematic.
To facilitate our customers who wish to purchase small quantities of piezo-electric polymers we stock a range of poled and unpoled PVdF and poled co-polymer film
Precision Acoustics does not have a catalogue of transducers but prefers to work with clients to develop ultrasound transducers for their particular application. Working with a standard range of casing options we can offer a low cost solution for customised transducers with frequencies above 500kHz.
Please contact us to discuss your requirements once you have read the webpages on transducer design