SENSOR SOLUTIONS /// NDT1-220K Ultrasonic Transducer Rev 1 9/2015
Page 1
FEATURES
High Bandwidth, Low Q Performance
Excellent Acoustic Match to Liquids,
Polymers
Low Electrical Impedance (30 to 100 ohms
typ)
Lightweight, Robust, Flexible Design
Conforms to Flat or Curved Surfaces
Low Cost, Disposable Transducers
APPLICATIONS
Liquid Presence/Absence (through-wall)
Thickness Measurement (solids, elastomers)
Liquid Depth (bottom-up)
Speed of Sound Measurement
Tamper Detection
Description
Model No.
Part No.
Dual layer 110 µm
NDT1-220K
1005935-1
NDT1-220K
Ultrasonic Transducer
SPECIFICATIONS
Low cost ultrasonic transducer
Flexible Format
3 MHz nominal center frequency
Various housings available
High Bandwidth; Low Q Performance
Low Impedance
The NDT1-220K element offers outstanding
ultrasonic transducer performance in a low-cost, flexible
format for general-purpose use. It has a 3 MHz nominal
center frequency, with extremely low Q-factor of 1.3 (air-
backed, into PMMA). Electrical impedance is well
matched to conventional NDT instrumentation
(pulsar/receivers). Unit-to-unit repeatability is very good.
The transducer is robust, and conforms perfectly to
cylindrical surfaces such as pipe or tank walls. Epoxies,
transfer adhesives, or even double-coated tapes may be
used as bonding agents.
NDT1-220K
Ultrasonic Transducer
SENSOR SOLUTIONS /// NDT1-220K Ultrasonic Transducer Rev 1 9/2015
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DIMENSIONS IN INCHES [IN MILLIMETERS]
A (film)
B (electrode)
C (film)
D (electrode)
.650 [17]
.485 [12]
5.51 [140]
1.18 [30]
Connector provides two 0.025" square pins on 0.1" spacing and will mate with a wide range of
FFC (flexible flat cable) receptacles.
PERFORMANCE SPECIFICATIONS
TYPICAL PROPERTIES/SPECIFICATIONS
Typical Properties (at 25 °C)
Parameter
NDT1-220K
Units
Capacitance
670
pF @ 1 kHz
Center Frequency
3
MHz (in PPMA)
Lower -6 dB Freq
1.7
MHz
Upper -6 dB Freq
4.0
MHz
Q-Factor
1.3
(none)
Impedance at f(c)
100
Ω
Thickness (over length “C”)
0.30
mm
NDT1-220K Frequency Response
0
0.001
0.002
0.003
0.004
0.005
0.006
0.007
0.008
0.009
0.E+00 1.E+06 2.E+06 3.E+06 4.E+06 5.E+06 6.E+06
Frequency (Hz)
Magnitude (V rms)
NDT1-220K
Ultrasonic Transducer
SENSOR SOLUTIONS /// NDT1-220K Ultrasonic Transducer Rev 1 9/2015
Page 3
Environmental Specifications
Storage Temperature
-40 to +80 °C
Operating Temperature
-20 to +60 °C
EXAMPLES OF TYPICAL RECEIVER WAVEFORMS
damping = 0 damping = 5 damping = 10
Y-axis: 0.2 V/div Y-axis: 0.1 V/div Y-axis: 10 mV/div
X-axis 1 µs/div, overall system gain: +10 dB
(note: transmit pulse amplitude varies according to damping setting).
Traces above taken using NDT1-220K element bonded with epoxy resin to nominal 9.5 mm thickness PMMA block.
NDT1-220K
Ultrasonic Transducer
SENSOR SOLUTIONS /// NDT1-220K Ultrasonic Transducer Rev 1 9/2015
Page 4
EXAMPLES OF APPLICATIONS
Liquid presence/absence in tank – through-wall
Liquid presence/absence in pipe or cylindrical vessel Liquid depth in tank
(high S/N ratio) (< 3 mm min depth, with polymer tank)
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