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Piezofilm LDT Series

Image LDT

The ‘L’ in LDT stands for ‘laminated’ sensor. Typically, a 0.005” (125μm) polyester layer is laminated to a 28 μm or 52μm piezo film element.

When used in a ‘bending’ mode, laminated film elements develop much higher voltage output when flexed than a non-laminated DT elements series.

The neutral axis is in the laminate instead of in the film so the film is strained more when flexed. The capacitance is proportional to the area and inversely proportional to the thickness of the element.

Piezo film sensors LDT elements are available in a variety of lead attachment options. For significantly increased sensitivity, the LDTM-028K (M-Mass) combines an LDT0-028K form factor with the addition of a 0.72 gram round mass.

Piezo film cannot withstand high temperatures (>80°C), and therefore soldering of the pins to a PCB must be done quickly. A heatsink clamped to the interface area between the film and the crimps will take the heat away from the film. Pre-tin the PCB and then quickly solder the sensor to the board.

Do not allow the soldering iron to touch the film, and do not use a dwell time of over 5 seconds on the pins. Low temperature solders can also be used.

Applications for this include beam-type vibration sensors for vehicle alarms and solid state switches for counters and momentary closure type switches. For tightly tolerance sensitivity requirements, please consult MEAS Sensors for techniques used to control variations of boundary conditions in production.


Features

  • Solder tab connection
  • Both no mass & with mass version
  • Withstands high impact
  • Operating temperature: 0ºC to 85ºC
  • Storage temperature: -40ºC to 85 ºC
  • Higher temperature version up to 125 ºC available on a custom basis

Applications

  • Vibration Sensing in Washing Machine
  • Low Power Wakeup Switch
  • Low Cost Vibration Sensing
  • Car Alarms
  • Body Movement
  • Security Systems

Documents and Files

File Date Size
Piezofilm LDT Series datasheet (English) 24/10/2008 901KB
Piezofilm sensors technical manual (English) 02/08/2012 1.9MB
Piezofilms FAQs (English) 02/05/2007 147KB
Interfacing piezofilms to electronics (English) 01/03/2006 573KB
Applying piezoelectric film in electronic designs (English) 16/12/2009 205KB
Piezofilm sensors modeling (English) 01/01/1989 771KB
Power generation using Piezofilms (English) 24/08/2010 192KB
Vital signs monitoring with piezofilm sensors (English) 18/05/2012 1.2MB
Ultrasonic PVDF transducer for 3-4 MHz operation (English) 13/09/2001 252KB
Aerosol spray noise profile (English) 26/02/2001 226KB
Detection of airflow (inhalation) in tube using laminated piezofilm element (English) 13/03/2001 473KB
Elasticated Chest/Abdomen Strap with Piezo Film Sensor (English) 04/09/2000 155KB
Comparison of frequency response: double-coated tape vs epoxy resin (English) 16/05/2002 165KB
Experiments with front-face co-planar ground electrodes (English) 02/02/2001 144KB
Piezo Film Glass-Break Sensors (English) 01/12/1998 294KB
Human shaking detection (English) 22/02/2001 153KB
Impact detection (English) 01/03/2000 178KB
PVDF Modal Analysis (English) 01/02/1988 897KB
Pulse/echo response of 52 micron PVDF with silver ink electrodes (English) 29/03/2002 315KB
PVDF noise performance (English) 28/10/2002 148KB
Pyroelectric Response in PVDF (English) 29/08/2001 261KB
Inflatable Chair Gives Respiration & Pulse Signals (English) 07/09/1999 107KB
Efficiency comparison between moving-coil and piezo film speakers (English) 13/10/2000 115KB
Comparison between piezofilm sensor, strain gauge, and accelerometer (English) 01/01/1987 412KB
Fuel Tank Level Sensor (English) 29/09/1992 608KB
Vandal-proof PVDF keypad principles (English) 16/06/1993 143KB
Vehicle vibration monitoring using PVDFs (English) 07/01/2002 192KB
Vibrating diaphragm using piezofilm (English) 23/09/1999 201KB
Detecting wheel rotation using piezofilms (English) 24/09/2002 163KB