Piezo ceramic disc parameter:
Part number: L2Ø42.7×200KHZ
Dimension: diameter 42.7mm, thickness 10.8mm
Resonant frequency: 200 kHz
Material: PZT4L2
CT(pF):1650±12.5%
tgδ(%): 0.5%
fr(KHZ): 50 kHz
fa(KHZ): 59 kHz
zr(Ω): 5.63
KP(%): ≥59
fst(kHz): 200+5
Zrt(Ω): 2.63
fPt(KHz): 211.59
d33(pC/N): ≥300
Custom Range:
Other frequencies: 200khz to 10MHz.
the new method! The embedded smart PZT sensor detects the concrete internal structure
The hydration process of concrete begins with the mixing of concrete and water. Early monitoring of concrete is difficult due to the presence of moisture and the highly alkaline environment inside the concrete. Early development Concrete performance is an important factor in determining the bearing capacity of concrete structures. Monitoring mass concrete structures in situ requires a large number of robust sensors.
PZT Sensor
In this study, it is developed whether the embedded PZT sensor can be placed inside the concrete and has concrete that is resistant to alkali and humid environments.
At the time of pouring, a set of PZT sensors were placed inside the concrete structure (1 hour) to monitor material changes over 28 days.
Localized and distributed sensing modes using PZT sensors.
Local sensing is based on the monitoring of current changes in the impedance (EI) of the embedded PZT sensor.
Changes in EI measurements appear as sensitive reflections of solid matter gains in changes in hydrated concrete from fluid to solid state and strength.
Piezo Ceramic Disc Application
In distributed measurement, PZT sensors are used as actuator-receivers (AR) for the global monitoring of concrete.
Changes in the material medium produced by the change of the stress wave propagating the concrete in the pipe are monitored. Changes in hydration state along the Cretan stress wave propagation path are sensitively reflected in AR measurements. EI and AR measurement techniques are combined to develop an efficient method to monitor age changes in mass concrete in the early days with fewer PZT sensors.
EI measurements are used to assess changes in the vicinity of the sensor, and AR measurements are used to assess the volume of concrete, therefore, electromagnetic and AR measurements are correlated to infer similar performance at the local level (within the PZT’s sphere of influence) and globally Tier 1 (most of the material) can use rial.
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