LDTC-HORIZONTAL Measurement Specialties Inc., LDTC-HORIZONTAL Datasheet - Page 3

• Manufacturer Part Number: LDTC-HORIZONTAL
• Description: Vibration & Tilt Sensors HORZ. SOLDER PINS
• Manufacturer: Measurement Specialties Inc.

Specifications of LDTC-HORIZONTAL

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 1005939-1

MiniSense 100 Vibration Sensor Rev 1
MiniSense 100 Vibration Sensor
The MiniSense 100
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.
excitation frequencies below the resonant frequency of the sensor, the device produces a linear
output governed by the “baseline” sensitivity quoted above.
significantly higher.
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”).
The MiniSense 100
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/(2πRC). 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.
1E+10
1E+09
1E+08
1E+07
1E+06
0.1
Electrical Impedance
External R (Ω)
100 M
10 M
1 G
1
Frequency (Hz)
Impacts containing high-frequency components will excite the resonance
behaves electrically as an “active” capacitor: it may be modelled as a
acts as a cantilever-beam accelerometer. When the beam is mounted
Lower Limiting Frequency (-3 dB roll-off)
10
functional description
LLF (Hz)
electrical description
0.65
6.5
65
100
www.meas-spec.com
3 of 4
Desired LLF (Hz)
-10
-20
-30
-40
10
0
0.1
0.1
10
1
Low frequency roll-off
The sensitivity at resonance is
Frequency (Hz)
Required R (Ω)
1
650 M
6.5 G
65 M
10
1 G
100 M
05/12/2009
For