TE Connectivity 1005939-1

The Minisense 100 is a low-cost cantilever-type vibration sensor loaded by a mass to offer high sensitivity at low frequencies. The pins are designed for easy installation and are solderable. Horizontal and vertical mounting options are offered as well as a reduced height version. The active sensor area is shielded for improved RFI/EMI rejection. Rugged, flexible PVDF sensing element withstands high shock overload. Sensor has excellent linearity and dynamic range, and may be used for detecting either continuous vibration or impacts. 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. 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 / (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.

• High Voltage Sensitivity (1 V/g)
• Over 5 V/g at Resonance
• Horizontal or Vertical Mounting
• Shielded Construction
• Solderable Pins, PCB Mounting
• Low Cost
• < 1% Linearity Up to 40 Hz (2,400 rpm)
• Operation Below Resonance

• Washing Machine Load Imbalance
• Vehicle Motion Sensor
• Anti-Theft Devices
• Vital Signs Monitoring
• Tamper Detection
• Impact Sensing