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MiniSense 100 Vibration Sensor
functional description
The MiniSense 100 acts as a cantilever-beam accelerometer. When the beam is mounted
horizontally, acceleration in the vertical plane creates bending in the beam, due to the inertia of the
mass at the tip of the beam. Strain in the beam creates a piezoelectric response, which may be
detected as a charge or voltage output across the electrodes of the sensor.
The sensor may be used to detect either continuous or impulsive vibration or impacts. For
excitation frequencies below the resonant frequency of the sensor, the device produces a linear
output governed by the “baseline” sensitivity quoted above. The sensitivity at resonance is
significantly higher. Impacts containing high-frequency components will excite the resonance
frequency, as shown in the plot above (response of the MiniSense 100 to a single half-sine impulse
at 100 Hz, of amplitude 0.9 g). The ability of the sensor to detect low frequency motion is strongly
influenced by the external electrical circuit, as described below (see “Electrical Description”).
electrical description
The MiniSense 100 behaves electrically as an “active” capacitor: it may be modelled as a
perfect voltage source (voltage proportional to applied acceleration) in series with the quoted
device capacitance. Any external input or load resistance will form a high-pass filter, with a roll-off
frequency as tabulated above, or calculated from the formula f(c) = 1/(2 π RC). The impedance of
the sensor is approximately 650 M ohm at 1 Hz. The active sensor element is electrically shielded,
although care should be taken in the PCB design to keep unshielded traces as short as possible.
Lower Limiting Frequency (-3 dB roll-off)
External R ( ? )
10 M
100 M
1G
LLF (Hz)
65
6.5
0.65
Desired LLF (Hz)
10
1
0.1
Required R ( ? )
65 M
650 M
6.5 G
1E+10
1E+09
Electrical Impedance
10
0
Low frequency roll-off
-10
1G
1E+08
1E+07
-20
-30
100 M
1E+06
0.1
1 10
Frequency (Hz)
100
-40
0.1
1
Frequency (Hz)
10
MiniSense 100 Vibration Sensor Rev 1
www.meas-spec.com
3 of 4
05/12/2009
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