OHD Blog

What’s the worst sound in the world?

Mar 5, 2019

No matter who you are, there’s always that one sound that makes your toes curl and your skin crawl. Whether it’s terracotta plant pots, nails on a chalkboard or children crying, there are a whole host of sounds out there that can only be described in one way: unbearable.

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We work 12-hour shifts. What dosimeter criterion time should we use?

Feb 18, 2019

Is it just me, or can trying to decipher an OSHA regulation be confusing? Take, for instance, the OSHA Occupational Noise Exposure Standard (29 CFR 1910.95). The OSHA noise standard defines the action level to enroll an employee in a hearing conversation program as “an 8-hour time-weighted average of 85 decibels measured on the A-scale, slow response, or equivalently, a dose of 50 percent.” Because the action level is based on an exposure for an 8-hour work shift, a common point of confusion is what to do for work shifts that are not 8 hours, such as 10- or 12-hour work shifts. A common question we are asked is, “We work a 12-hour shift: Should I use 8 or 12 as the time duration on my noise dosimeter to calculate the time-weighted average?” Understanding how changing the time duration of a noise dosimeter sample affects the results, and how this relates to the noise standard, will help us make the best decision.

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dBActive app now available for iOS and Android!

Jan 15, 2019

This year, Cirrus has taken another leap forward in their product offerings with the launch of the dBActive smartphone application!

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A Dosimeter for the Future: a History of the doseBadge

Sep 12, 2018

In 1995, a team of young engineers at Cirrus Research set to work on revolutionising the design and functionality of noise dosimeters. Their hard work and tireless dedication to the protection of people’s hearing led them to design the doseBadge, which has now become synonymous with personal noise exposure measurement. The process of designing the doseBadge wasn’t easy or without challenge, as the Cirrus engineers had to develop something that recorded all the necessary data, whilst ensuring that the person wearing the equipment wasn’t disturbed, and that the equipment itself complied with the Noise At Work regulations, in addition to being low cost, reliable, lightweight, tamper-proof and compliant with the acoustic standard. Some may have thought “why bother?”, but there was a recognition within the Cirrus team that dosimeters, at the time were very unreliable, cumbersome, liable to tampering and potentially dangerous, as the microphone cable could easily have been caught in heavy industrial machinery, causing serious injuries to those wearing them.

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What are the latest ways to measure environmental noise?

Dec 6, 2016

Environmental noise monitoring has traditionally been limited to main communication methods or manual downloads.  These methods required physical presence at the instrument and the ability to access the instruments easily.  As technology advancements continue to move forward, many of the connectivity methods have opened the door for advancements in looking at measuring environmental noise.  These advancements also allow less physical presence and open the door to remote connectivity around the world.  The first advancement is Wi-Fi compatibility with environmental noise instruments.  These instruments can be remotely staged inside or outside a facility and connected throughout the day via a Wi-Fi connection.  With a strong Wi-Fi connection, operators can access the GPS coordinates of the instrument, download measurement data, and listen live through the instrument on a 5 – 10 second delay.  With this form of connectivity, reporting and real time data is easily captured or monitored.   Sound Measurement in the field 5.jpgDownload White Paper

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