1002794

1002794 Datasheet

1 Megohm 10 Megohm 100 Megohm

Part	Datasheet
1002794	1002794 (pdf)

Related Parts	Information
1005447-1	1005447-1

PDF Datasheet Preview
LDT with Crimps Vibration Sensor/Switch Piezo Film Sensors High Sensativity AC Coupled Laminated Robust The LDT0-028K is a flexible component comprising a 28 µm thick piezoelectric PVDF polymer film with screen-printed Ag-ink electrodes, laminated to a mm polyester substrate, and fitted with two crimped contacts. As the piezo film is displaced from the mechanical neutral axis, bending creates very high strain within the piezopolymer and therefore high voltages are generated. When the assembly is deflected by direct contact, the device acts as a flexible "switch", and the generated output is sufficient to trigger MOSFET or CMOS stages directly. If the assembly is supported by its contacts and left to vibrate "in free space" with the inertia of the clamped/free beam creating bending stress , the device will behave as an accelerometer or vibration sensor. Adding mass, or altering the free length of the element by clamping, can change the resonant frequency and sensitivity of the sensor to suit specific applications. Multi-axis response can be achieved by positioning the mass off center. The LDTM-028K is a vibration sensor where the sensing element comprises a cantilever beam loaded by an additional mass to offer high sensitivity at low frequencies. • 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 • Vibration Sensing in Washing Machine • Low Power Wakeup Switch • Low Cost Vibration Sensing • Car Alarms • Body Movement • Security Systems 1of 4 dimensions 10/13/2008 LDT with Crimps Vibration Sensor/Switch examples of properties Four different experiments serve to illustrate the various properties of this simple but versatile component. Experiment #1 LDT0 as Vibration Sensor - with the crimped contacts pushed through a printed-circuit board, the LDT0 was soldered carefully in place to anchor the sensor. A charge amplifier was used to detect the output signal as vibration from a shaker table was applied using a charge amplifier allows a very long measurement time constant and thus allows the "open-circuit" voltage response to be calculated . Small masses approximately 0.26g increments were then added to the tip of the sensor, and the measurement repeated. Results are shown in Table 1 and the overlaid plots in Fig. Without adding mass, the LDT0 shows a resonance around 180 Hz. Adding mass to the tip reduces the resonance frequency and increases "baseline" sensitivity. Added Mass 0 1 2 3 TABLE 1 LDT0 as Vibration Sensor see Fig 1 Baseline Sensitivity Sensitivity at Resonance Resonant Frequency +3 Db Frequency 50 mV/g 180 Hz 90 Hz 200 mV/g 4 V/g 90 Hz 45 Hz 400 mV/g 8 V/g 60 Hz 30 Hz 800 mV/g 16 V/g 40 Hz 20 Hz ordering information Description LDT0-028K LDTM-028K Part Number 1002794-0 1005447-1 North America Measurement Specialties, Inc. 1000 Lucas Way Hampton, VA 23666 Sales and Customer Service Tel +1-800-745-8008 or +1-757-766-1500 Fax +1-757-766-4297 Technical Support Email: Europe Asia MEAS Deutschland GmbH Hauert 13 44227 Dortmund Germany Sales and Customer Service Tel +49 0 231 9740 21 Technical Support Tel +49 0 6074 862822 Email: 4 of 4 Measurement Specialties China , Ltd. No. 26 Langshan Road Shenzhen High-Tech Park North Nanshan District Shenzhen, China 518107 Sales and Customer Service Tel +86 755 3330 5088 Technical Support Email: 10/13/2008

PDF Datasheet Preview

LDT with Crimps Vibration Sensor/Switch

Piezo Film Sensors

High Sensativity

AC Coupled

Laminated

Robust

The LDT0-028K is a flexible component
comprising a 28 µm thick piezoelectric PVDF polymer film with screen-printed Ag-ink electrodes, laminated to a mm polyester substrate, and fitted with two crimped contacts. As the piezo film is displaced from the mechanical neutral axis, bending creates very high strain within the piezopolymer and therefore high voltages are generated. When the assembly is deflected by direct contact, the device acts as a flexible "switch", and the generated output is sufficient to trigger MOSFET or CMOS stages directly. If the assembly is supported by its contacts and left to vibrate "in free space" with the inertia of the clamped/free beam creating bending stress , the device will behave as an accelerometer or vibration sensor. Adding mass, or altering the free length of the element by clamping, can change the resonant frequency and sensitivity of the sensor to suit specific applications. Multi-axis response can be achieved by positioning the mass off center. The LDTM-028K is a vibration sensor where the sensing element comprises a cantilever beam loaded by an additional mass to offer high sensitivity at low frequencies.
• 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
• Vibration Sensing in Washing Machine
• Low Power Wakeup Switch
• Low Cost Vibration Sensing
• Car Alarms
• Body Movement
• Security Systems
1of 4
dimensions
10/13/2008

LDT with Crimps Vibration Sensor/Switch
examples of properties

Four different experiments serve to illustrate the various properties of this simple but versatile component.

Experiment #1 LDT0 as Vibration Sensor - with
the crimped contacts pushed through a printed-circuit board, the LDT0 was soldered carefully in place to anchor the sensor. A charge amplifier was used to detect the output signal as vibration from a shaker table was applied using a charge amplifier allows a very long measurement time constant and thus allows the "open-circuit" voltage response to be calculated . Small masses approximately 0.26g increments were then added to the tip of the sensor, and the measurement repeated. Results are shown in Table 1 and the overlaid plots in Fig. Without adding mass, the LDT0 shows a resonance around 180 Hz. Adding mass to the tip reduces the resonance frequency and increases "baseline" sensitivity.

Added Mass
0 1 2 3

TABLE 1 LDT0 as Vibration Sensor see Fig 1

Baseline Sensitivity

Sensitivity at Resonance

Resonant Frequency
+3 Db Frequency
50 mV/g
180 Hz
90 Hz
200 mV/g
4 V/g
90 Hz
45 Hz
400 mV/g
8 V/g
60 Hz
30 Hz
800 mV/g
16 V/g
40 Hz
20 Hz
ordering information

Description LDT0-028K LDTM-028K

Part Number 1002794-0 1005447-1

North America

Measurement Specialties, Inc. 1000 Lucas Way Hampton, VA 23666 Sales and Customer Service Tel +1-800-745-8008 or +1-757-766-1500 Fax +1-757-766-4297 Technical Support Email:

Europe

Asia

MEAS Deutschland GmbH Hauert 13 44227 Dortmund Germany Sales and Customer Service Tel +49 0 231 9740 21 Technical Support Tel +49 0 6074 862822 Email:
4 of 4

Measurement Specialties China , Ltd. No. 26 Langshan Road Shenzhen High-Tech Park North Nanshan District Shenzhen, China 518107 Sales and Customer Service Tel +86 755 3330 5088 Technical Support Email:
10/13/2008

More datasheets: 9250-332 | 9250-272 | 9250-222 | 9250-182 | 9250-152 | 9250-682 | 9250-273 | KA7632 | MB6022USC-3 | 1005447-1

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived 1002794 Datasheet file may be downloaded here without warranties.

Datasheet ID: 1002794 647593