Design and laboratory evaluation of an inexpensive noise sensor

Exposure to noise, particularly in occupational environments, can result in irreversible hearing loss. Traditionally, occupational noise exposures are measured on a worker using devices that cost over $1,500. A stationary network of these devices could be used to continuously monitor and visualize how noise varies over space and time in the workplace, helping to comprehensively assess the hazard and prioritize actions to reduce noise sources. However, the cost of these devices limits the feasibility of their use. Availability of an inexpensive, but accurate, noise sensor would alleviate some of the cost concerns.

There were two objectives to this study. The first was to develop an inexpensive noise sensor that can detect noise levels within ±2 A‐weighted decibels (dBA) of the more expensive reference device. Second, fifty inexpensive noise sensors were evaluated prior to deployment as part of a stationary monitor network in a heavy‐vehicle manufacturing facility.

The inexpensive noise sensor (<$100) performed similarly to the reference device (~$1,800) across a 75 to 94 dBA range. These noise levels are typical of what is expected in the heavy-vehicle manufacturing facility where they will be deployed. The versatility of these noise sensors coupled with their accuracy is promising for future applications in different occupational environments.