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Piezoelectric sensor cost1/18/2024 Table 1 highlights some more advantages of MEMS accelerometers for CbM applications. The implications with a piezoelectric sensor undergoing a severe shock mean there is a risk that valuable information or failures in the asset/process could go undetected, while MEMS sensors will detect impact events and subsequent events reliably.įigure 2. MEMS, on the other hand, matches the noncontact reference sensor by settling back to normal almost instantly. piezoelectric.įigure 2 shows that when piezoelectric sensors are exposed to large shock events they can saturate, and due to the large RC time constant they can take a long time to settle back to normal. Being able to measure these low frequencies is very useful for wind turbines, and other types of slow rotating machinery used in metal processing, pulp/paper processing, and food/beverage industries where slow rotating speeds of assets below 60 rpm (1 Hz) are common.įigure 1. ![]() It is clearly understood that piezoelectric sensors can offer better noise performance than MEMS at higher frequencies, but at low frequencies MEMS sensors offer lower noise all the way to dc. Figure 1 shows how MEMS can measure down to dc, allowing measurements from very slow rotating machinery as well as tilt detection. MEMS sensors are based on a completely different principle of operation to piezoelectric sensors, and this is where the key differences arise. ![]() Likewise, some low noise MEMS accelerometers (designed specifically to detect tilt) are available but have insufficient bandwidth and g-range.Ī small number of MEMS manufacturers have been striving to overcome the noise, bandwidth, and g-range shortcomings and as such have produced several medium and high performance MEMS accelerometers with the latter being comparable to piezoelectric accelerometers. While many high g-range accelerometers are available (designed specifically for automotive impact detection), they have very limited noise performance and bandwidth, making them unsuitable for CbM. Until recently, MEMS accelerometers’ limited bandwidth, noise performance, and g-range capabilities prevented their use in CbM of critical assets. ![]() Piezoelectric accelerometers have been long established as the gold standard vibration sensor used on the most critical assets to ensure they remain operational and perform efficiently. Even now vibration analysis is considered the most important modality for predictive maintenance (PdM). Vibration sensors have been used to detect machine health as far back as the 1930s. The Current State of the Art in Vibration Sensing-MEMS vs. Key design considerations for MEMS accelerometers in CbM applications will also be discussed with a comparison of five MEMS sensors from three different vendors. This article will compare MEMS accelerometers to piezoelectric accelerometers to highlight just how far MEMS sensors have come in their short lifetime. ![]() There is an increased demand for CbM on less critical assets as well as a growing adoption rate of wireless CbM systems, and MEMS accelerometers are the key to this. 1 This growth coincides with the rapid advancement of MEMS accelerometers for use in vibration sensing applications, now rivaling the once dominant piezoelectric or PZT accelerometer. The global condition-based monitoring (CbM) market has experienced significant growth over the past few years, and this looks set to continue. Why MEMS Accelerometers Are Becoming the Designer’s Best Choice for CbM ApplicationsĬhris Murphy Download PDF Introduction to Condition-Based Monitoring
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