Accurate Sound Level Measurement: Tools and Techniques Explained

Sound level measurement is the process of quantifying how intense a sound is; this measurement is typically measured in decibels (dB). A sound measuring instrument evaluates a sound’s pressure levels against the standard reference point (20 µPa), the quietest sound audible to the human ear.

For example, a typical conversation typically registers at about 60 dB, while a jet engine measures approximately 140 dB. Unlike linear scales, the decibel scale is logarithmic. This means that 10 dB isn’t just 10 points higher than another sound; the intensity of the sound has increased tenfold. The jet engine isn’t twice as loud as a conversation; it’s 100 million times more intense.

Key factors when selecting a sound measuring device include measurement range and data logger capabilities. Devices with frequency weighting options (A, C, Z) can provide measurements that closely align with human hearing. A device must also be appropriate for the intended environment and could require weatherproofing features. Advanced sound measuring devices may feature vibration detection safeguards to eliminate errors caused by unnecessary movements.

Modern sound measurement instruments are engineered with advanced features to meet the demands of a variety of industries:

• Time Weighting: These settings allow users to capture noise variations over different durations. Fast (125 ms) and slow (one second) settings are needed to measure fluctuating noise. Impulse weighting (35 ms rise time) captures sudden and short bursts of sound.
• Data Logging: Sound measure instruments offer data logging, enabling users to record and store their measurements over extended periods. Data loggers like the NR-500 Series use real-time data acquisition to provide real-time data visualization for users to monitor their sound levels.
• Calibration and Accuracy: Calibration is a key element of all professional devices that measure sound. Most have built-in accelerometers to detect vibrations and exclude erroneous data.
• Durability: Rugged designs allow for sound level measurements in the rain or other extreme temperatures.

Regulatory bodies like OSHA and international standards such as IEC 61672 are in charge of mandating strict noise thresholds. Accurate sound level measurements help protect individuals from excess sound exposure. For example, a noise dosimeter can monitor a worker’s daily exposure to sound over their shift. If the worker is exposed to too much sound, the noise dosimeter can alert the worker, and they can move to a safer area.

In construction and urban development, sound measure instruments and DAQ systems are needed to determine environmental noise levels. Noise pollution from heavy machinery and construction sites have to comply with local ordinances in order to protect local communities.

Similarly, airports and rail systems utilize sound level measurements to monitor and manage noise levels in order to gauge their impact on their surroundings.

The biggest benefit gained from accurate sound level measurement is understanding how it affects our environment. Industries can mitigate harmful noise levels and protect hearing in workplaces with this data. If you’re in the market for state-of-the-art sound measure instruments designed to deliver actionable data, KEYENCE is here to answer your call. Our advanced systems feature anomaly detection and real-time alerts, ensuring precise and timely insights.

Contact us today to explore our reliable industrial DAQ systems for sound measurement tools today!