+55 (16) 3371-0112 •

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 889KB
Piezofilm sensors technical manual (English) 02-08-2012 1.9MB
Piezofilms FAQs (English) 02-05-2007 136KB
Interfacing piezofilms to electronics (English) 01-03-2006 561KB
Applying piezoelectric film in electronic designs (English) 16-12-2009 194KB
Piezofilm sensors modeling (English) 01-01-1989 760KB
Power generation using Piezofilms (English) 24-08-2010 181KB
Vital signs monitoring with piezofilm sensors (English) 18-05-2012 1.2MB
Ultrasonic PVDF transducer for 3-4 MHz operation (English) 13-09-2001 240KB
Aerosol spray noise profile (English) 26-02-2001 214KB
Detection of airflow (inhalation) in tube using laminated piezofilm element (English) 13-03-2001 461KB
Elasticated Chest/Abdomen Strap with Piezo Film Sensor (English) 04-09-2000 144KB
Comparison of frequency response: double-coated tape vs epoxy resin (English) 16-05-2002 154KB
Experiments with front-face co-planar ground electrodes (English) 02-02-2001 133KB
Piezo Film Glass-Break Sensors (English) 01-12-1998 283KB
Human shaking detection (English) 22-02-2001 141KB
Impact detection (English) 01-03-2000 167KB
PVDF Modal Analysis (English) 01-02-1988 885KB
Pulse/echo response of 52 micron PVDF with silver ink electrodes (English) 29-03-2002 304KB
PVDF noise performance (English) 28-10-2002 136KB
Pyroelectric Response in PVDF (English) 29-08-2001 250KB
Inflatable Chair Gives Respiration & Pulse Signals (English) 07-09-1999 96KB
Efficiency comparison between moving-coil and piezo film speakers (English) 13-10-2000 104KB
Comparison between piezofilm sensor, strain gauge, and accelerometer (English) 01-01-1987 400KB
Fuel Tank Level Sensor (English) 29-09-1992 597KB
Vandal-proof PVDF keypad principles (English) 16-06-1993 132KB
Vehicle vibration monitoring using PVDFs (English) 07-01-2002 181KB
Vibrating diaphragm using piezofilm (English) 23-09-1999 190KB
Detecting wheel rotation using piezofilms (English) 24-09-2002 151KB