Ultrasonic measurementsISVR Consulting are able to measure sound pressure levels at ultrasonic frequencies, i.e. frequencies above the normal audible range. Examples of projects have included
- Measurement of the frequency responses of an ultrasonic transmitter and an ultrasonic receiver
- Measurements of the output sound level, output frequencies and directionality of an ultrasonic deterrent designed to keep cats out of gardens
- Measurements of the output levels of specialist distance measuring devices
- Measurements of ultrasonic levels from laboratory equipment and comparison with health and safety guidelines for the operators
- Measurements of ultrasound levels from large industrial processors designed to break rock and solids in water down into gravel and sand
Measurements can be made in our anechoic chamber under well-controlled conditions, or on-site if the source of the ultrasound is a large item of plant or part of a large installation.
In exposed individuals, ultrasound can cause unpleasant feelings, including temporary nausea, at levels below those dangerous to hearing. When ultrasonic equipment is used in the workplace we can assess the measured sound levels against guideline limits, to ensure the comfort and well being of those working nearby, as well as their safety.
In 2001 we completed a literature review entitled “Damage to human hearing by airborne sound of very high frequency or ultrasonic frequency” for the Health & Safety Executive. This report, HSE CCR 343/2001 is still relevant and available in Acrobat (pdf) format from the HSE website. A more recent summary is available in “Exposure limits for airborne sound of very high frequency and ultrasonic frequency” by B.W. Lawton, ISVR Technical Report No: 334, April 2013. (pdf 120 KB)