Acoustic Emission Transducers

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DAKEL AE sensors of passive type (without integrated preamplifier with band-pass characteristics) have generaly a resonant transmission characteristics. Local minima and maxima which exist in the broad frequency spectrum of a transducer are bound to the type of transducer casing and geometry and dimensions of used piezoelement. Lower boundary of the transmission characteristics is approximately 10 kHz, due to the application of (capacitive) coupling for elimination of pyroelectric effect. DAKEL sensors can be used up to frequencies of 2.8 MHz. For frequencies above 1 MHz the transmission characteristic is influenced by the parameters of the used coaxial cable.

"Relative comarative REF05 characteristics" obtained by exciting in the pulser-sensor system are displayed for individual transduced models. Transducer REF05 is used as actuator during all measurements. Exciting is provided by a sinus signal of 1 V_RMS. Acquisition is performed by the DAKEL-XEDO system with input amplifier working in the range of 80 kHz to 750 kHz.

Sensor division according to sensing signal frequency range:

Low-frequency sensors 0 Hz … 1 kHz
Mid-frequency sensors 1 kHz … 100 kHz
High-frequency AE sensors 100 kHz … 2 000 kHz

Division of AE sensors according to integrated electronics:

Sensors with out integrated electronics
Sensors with integrated 35 dB pre-amplifier
Sensors with integrated 35 dB pre-amplifier and swithiching relay for actuator mode
Combined sensors - containing sensor with integrated 35 dB pre-amplifier and a sensor for measuring in the low-frequency range (0 ... 1 kHz)

Sensor division according to operational temperatures:

Standard tmperature range: -20°C ... +75°C
Extended temperature range: -40°C ... +150°C
High temperature range: +20°C ... +300°C

Sensor division according to the mechanical endurance of sensor casing and the sealing degree:

Laboratory conditions - sealing degree IP 60
Industrial operational conditions - sealing degree IP 66
Hermetic design - sealing degree IP 68

Sensor division according to the coupling to the measured object:

Direct gluing od the sensor to the surface
Mechanical holder
Screwing connection (external or internal threading on the sensor)
Welded waveguide rod
Belt-buckle (on a pipeline)

Sensor division according to the contact surface material:

Nickel-coated steel
Stainless steel
Alumina
Composite

Sensor division according to the type of used piezoceramics:

DAK 274
DAK 432
DAK 15B
DAK 191